--- /dev/null
+// Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// Rust JSON serialization library
+// Copyright (c) 2011 Google Inc.
+
+#![forbid(non_camel_case_types)]
+#![allow(missing_docs)]
+
+//! JSON parsing and serialization
+//!
+//! # What is JSON?
+//!
+//! JSON (JavaScript Object Notation) is a way to write data in Javascript.
+//! Like XML, it allows to encode structured data in a text format that can be easily read by humans
+//! Its simple syntax and native compatibility with JavaScript have made it a widely used format.
+//!
+//! Data types that can be encoded are JavaScript types (see the `Json` enum for more details):
+//!
+//! * `Boolean`: equivalent to rust's `bool`
+//! * `Number`: equivalent to rust's `f64`
+//! * `String`: equivalent to rust's `String`
+//! * `Array`: equivalent to rust's `Vec<T>`, but also allowing objects of different types in the
+//! same array
+//! * `Object`: equivalent to rust's `BTreeMap<String, json::Json>`
+//! * `Null`
+//!
+//! An object is a series of string keys mapping to values, in `"key": value` format.
+//! Arrays are enclosed in square brackets ([ ... ]) and objects in curly brackets ({ ... }).
+//! A simple JSON document encoding a person, his/her age, address and phone numbers could look like
+//!
+//! ```ignore
+//! {
+//! "FirstName": "John",
+//! "LastName": "Doe",
+//! "Age": 43,
+//! "Address": {
+//! "Street": "Downing Street 10",
+//! "City": "London",
+//! "Country": "Great Britain"
+//! },
+//! "PhoneNumbers": [
+//! "+44 1234567",
+//! "+44 2345678"
+//! ]
+//! }
+//! ```
+//!
+//! # Rust Type-based Encoding and Decoding
+//!
+//! Rust provides a mechanism for low boilerplate encoding & decoding of values to and from JSON via
+//! the serialization API.
+//! To be able to encode a piece of data, it must implement the `serialize::RustcEncodable` trait.
+//! To be able to decode a piece of data, it must implement the `serialize::RustcDecodable` trait.
+//! The Rust compiler provides an annotation to automatically generate the code for these traits:
+//! `#[derive(RustcDecodable, RustcEncodable)]`
+//!
+//! The JSON API provides an enum `json::Json` and a trait `ToJson` to encode objects.
+//! The `ToJson` trait provides a `to_json` method to convert an object into a `json::Json` value.
+//! A `json::Json` value can be encoded as a string or buffer using the functions described above.
+//! You can also use the `json::Encoder` object, which implements the `Encoder` trait.
+//!
+//! When using `ToJson` the `RustcEncodable` trait implementation is not mandatory.
+//!
+//! # Examples of use
+//!
+//! ## Using Autoserialization
+//!
+//! Create a struct called `TestStruct` and serialize and deserialize it to and from JSON using the
+//! serialization API, using the derived serialization code.
+//!
+//! ```notrust
+//! // FIXME(#19470): this cannot be ```rust``` because it fails orphan checking at the moment
+//! extern crate serialize;
+//! use serialize::json;
+//!
+//! // Automatically generate `Decodable` and `Encodable` trait implementations
+//! #[derive(RustcDecodable, RustcEncodable)]
+//! pub struct TestStruct {
+//! data_int: u8,
+//! data_str: String,
+//! data_vector: Vec<u8>,
+//! }
+//!
+//! fn main() {
+//! let object = TestStruct {
+//! data_int: 1,
+//! data_str: "homura".to_string(),
+//! data_vector: vec![2,3,4,5],
+//! };
+//!
+//! // Serialize using `json::encode`
+//! let encoded = json::encode(&object);
+//!
+//! // Deserialize using `json::decode`
+//! let decoded: TestStruct = json::decode(encoded.as_slice()).unwrap();
+//! }
+//! ```
+//!
+//! ## Using the `ToJson` trait
+//!
+//! The examples above use the `ToJson` trait to generate the JSON string, which is required
+//! for custom mappings.
+//!
+//! ### Simple example of `ToJson` usage
+//!
+//! ```notrust
+//! // FIXME(#19470): this cannot be ```rust``` because it fails orphan checking at the moment
+//! extern crate serialize;
+//! use serialize::json::{mod, ToJson, Json};
+//!
+//! // A custom data structure
+//! struct ComplexNum {
+//! a: f64,
+//! b: f64,
+//! }
+//!
+//! // JSON value representation
+//! impl ToJson for ComplexNum {
+//! fn to_json(&self) -> Json {
+//! Json::String(format!("{}+{}i", self.a, self.b))
+//! }
+//! }
+//!
+//! // Only generate `RustcEncodable` trait implementation
+//! #[derive(Encodable)]
+//! pub struct ComplexNumRecord {
+//! uid: u8,
+//! dsc: String,
+//! val: Json,
+//! }
+//!
+//! fn main() {
+//! let num = ComplexNum { a: 0.0001, b: 12.539 };
+//! let data: String = json::encode(&ComplexNumRecord{
+//! uid: 1,
+//! dsc: "test".to_string(),
+//! val: num.to_json(),
+//! });
+//! println!("data: {}", data);
+//! // data: {"uid":1,"dsc":"test","val":"0.0001+12.539j"};
+//! }
+//! ```
+//!
+//! ### Verbose example of `ToJson` usage
+//!
+//! ```notrust
+//! // FIXME(#19470): this cannot be ```rust``` because it fails orphan checking at the moment
+//! extern crate serialize;
+//! use std::collections::BTreeMap;
+//! use serialize::json::{mod, Json, ToJson};
+//!
+//! // Only generate `Decodable` trait implementation
+//! #[derive(Decodable)]
+//! pub struct TestStruct {
+//! data_int: u8,
+//! data_str: String,
+//! data_vector: Vec<u8>,
+//! }
+//!
+//! // Specify encoding method manually
+//! impl ToJson for TestStruct {
+//! fn to_json(&self) -> Json {
+//! let mut d = BTreeMap::new();
+//! // All standard types implement `to_json()`, so use it
+//! d.insert("data_int".to_string(), self.data_int.to_json());
+//! d.insert("data_str".to_string(), self.data_str.to_json());
+//! d.insert("data_vector".to_string(), self.data_vector.to_json());
+//! Json::Object(d)
+//! }
+//! }
+//!
+//! fn main() {
+//! // Serialize using `ToJson`
+//! let input_data = TestStruct {
+//! data_int: 1,
+//! data_str: "madoka".to_string(),
+//! data_vector: vec![2,3,4,5],
+//! };
+//! let json_obj: Json = input_data.to_json();
+//! let json_str: String = json_obj.to_string();
+//!
+//! // Deserialize like before
+//! let decoded: TestStruct = json::decode(json_str.as_slice()).unwrap();
+//! }
+//! ```
+
+use self::JsonEvent::*;
+use self::StackElement::*;
+use self::ErrorCode::*;
+use self::ParserError::*;
+use self::DecoderError::*;
+use self::ParserState::*;
+use self::InternalStackElement::*;
+
+use std;
+use std::collections::{HashMap, BTreeMap};
+use std::{char, f64, fmt, io, num, str};
+use std::mem::{swap, transmute};
+use std::num::{Float, Int};
+use std::num::FpCategory as Fp;
+use std::str::FromStr;
+use std::string;
+use std::ops;
+use unicode::str as unicode_str;
+use unicode::str::Utf16Item;
+
+use Encodable;
+
+/// Represents a json value
+#[derive(Clone, PartialEq, PartialOrd)]
+pub enum Json {
+ I64(i64),
+ U64(u64),
+ F64(f64),
+ String(string::String),
+ Boolean(bool),
+ Array(self::Array),
+ Object(self::Object),
+ Null,
+}
+
+pub type Array = Vec<Json>;
+pub type Object = BTreeMap<string::String, Json>;
+
+pub struct PrettyJson<'a> { inner: &'a Json }
+
+pub struct AsJson<'a, T: 'a> { inner: &'a T }
+pub struct AsPrettyJson<'a, T: 'a> { inner: &'a T, indent: Option<uint> }
+
+/// The errors that can arise while parsing a JSON stream.
+#[derive(Clone, Copy, PartialEq)]
+pub enum ErrorCode {
+ InvalidSyntax,
+ InvalidNumber,
+ EOFWhileParsingObject,
+ EOFWhileParsingArray,
+ EOFWhileParsingValue,
+ EOFWhileParsingString,
+ KeyMustBeAString,
+ ExpectedColon,
+ TrailingCharacters,
+ TrailingComma,
+ InvalidEscape,
+ InvalidUnicodeCodePoint,
+ LoneLeadingSurrogateInHexEscape,
+ UnexpectedEndOfHexEscape,
+ UnrecognizedHex,
+ NotFourDigit,
+ NotUtf8,
+}
+
+#[derive(Clone, Copy, PartialEq, Show)]
+pub enum ParserError {
+ /// msg, line, col
+ SyntaxError(ErrorCode, uint, uint),
+ IoError(io::IoErrorKind, &'static str),
+}
+
+// Builder and Parser have the same errors.
+pub type BuilderError = ParserError;
+
+#[derive(Clone, PartialEq, Show)]
+pub enum DecoderError {
+ ParseError(ParserError),
+ ExpectedError(string::String, string::String),
+ MissingFieldError(string::String),
+ UnknownVariantError(string::String),
+ ApplicationError(string::String)
+}
+
+/// Returns a readable error string for a given error code.
+pub fn error_str(error: ErrorCode) -> &'static str {
+ match error {
+ InvalidSyntax => "invalid syntax",
+ InvalidNumber => "invalid number",
+ EOFWhileParsingObject => "EOF While parsing object",
+ EOFWhileParsingArray => "EOF While parsing array",
+ EOFWhileParsingValue => "EOF While parsing value",
+ EOFWhileParsingString => "EOF While parsing string",
+ KeyMustBeAString => "key must be a string",
+ ExpectedColon => "expected `:`",
+ TrailingCharacters => "trailing characters",
+ TrailingComma => "trailing comma",
+ InvalidEscape => "invalid escape",
+ UnrecognizedHex => "invalid \\u{ esc}ape (unrecognized hex)",
+ NotFourDigit => "invalid \\u{ esc}ape (not four digits)",
+ NotUtf8 => "contents not utf-8",
+ InvalidUnicodeCodePoint => "invalid Unicode code point",
+ LoneLeadingSurrogateInHexEscape => "lone leading surrogate in hex escape",
+ UnexpectedEndOfHexEscape => "unexpected end of hex escape",
+ }
+}
+
+/// Shortcut function to decode a JSON `&str` into an object
+pub fn decode<T: ::Decodable<Decoder, DecoderError>>(s: &str) -> DecodeResult<T> {
+ let json = match from_str(s) {
+ Ok(x) => x,
+ Err(e) => return Err(ParseError(e))
+ };
+
+ let mut decoder = Decoder::new(json);
+ ::Decodable::decode(&mut decoder)
+}
+
+/// Shortcut function to encode a `T` into a JSON `String`
+pub fn encode<T>(object: &T) -> string::String
+ where T: for<'a> Encodable<Encoder<'a>, fmt::Error>
+{
+ let mut s = String::new();
+ {
+ let mut encoder = Encoder::new(&mut s);
+ let _ = object.encode(&mut encoder);
+ }
+ s
+}
+
+impl fmt::Show for ErrorCode {
+ fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+ error_str(*self).fmt(f)
+ }
+}
+
+fn io_error_to_error(io: io::IoError) -> ParserError {
+ IoError(io.kind, io.desc)
+}
+
+impl std::error::Error for DecoderError {
+ fn description(&self) -> &str { "decoder error" }
+ fn detail(&self) -> Option<std::string::String> { Some(self.to_string()) }
+}
+
+pub type EncodeResult = fmt::Result;
+pub type DecodeResult<T> = Result<T, DecoderError>;
+
+fn escape_str(wr: &mut fmt::Writer, v: &str) -> fmt::Result {
+ try!(wr.write_str("\""));
+
+ let mut start = 0;
+
+ for (i, byte) in v.bytes().enumerate() {
+ let escaped = match byte {
+ b'"' => "\\\"",
+ b'\\' => "\\\\",
+ b'\x00' => "\\u0000",
+ b'\x01' => "\\u0001",
+ b'\x02' => "\\u0002",
+ b'\x03' => "\\u0003",
+ b'\x04' => "\\u0004",
+ b'\x05' => "\\u0005",
+ b'\x06' => "\\u0006",
+ b'\x07' => "\\u0007",
+ b'\x08' => "\\b",
+ b'\t' => "\\t",
+ b'\n' => "\\n",
+ b'\x0b' => "\\u000b",
+ b'\x0c' => "\\f",
+ b'\r' => "\\r",
+ b'\x0e' => "\\u000e",
+ b'\x0f' => "\\u000f",
+ b'\x10' => "\\u0010",
+ b'\x11' => "\\u0011",
+ b'\x12' => "\\u0012",
+ b'\x13' => "\\u0013",
+ b'\x14' => "\\u0014",
+ b'\x15' => "\\u0015",
+ b'\x16' => "\\u0016",
+ b'\x17' => "\\u0017",
+ b'\x18' => "\\u0018",
+ b'\x19' => "\\u0019",
+ b'\x1a' => "\\u001a",
+ b'\x1b' => "\\u001b",
+ b'\x1c' => "\\u001c",
+ b'\x1d' => "\\u001d",
+ b'\x1e' => "\\u001e",
+ b'\x1f' => "\\u001f",
+ b'\x7f' => "\\u007f",
+ _ => { continue; }
+ };
+
+ if start < i {
+ try!(wr.write_str(v[start..i]));
+ }
+
+ try!(wr.write_str(escaped));
+
+ start = i + 1;
+ }
+
+ if start != v.len() {
+ try!(wr.write_str(v[start..]));
+ }
+
+ wr.write_str("\"")
+}
+
+fn escape_char(writer: &mut fmt::Writer, v: char) -> fmt::Result {
+ let mut buf = [0; 4];
+ let n = v.encode_utf8(&mut buf).unwrap();
+ let buf = unsafe { str::from_utf8_unchecked(buf[0..n]) };
+ escape_str(writer, buf)
+}
+
+fn spaces(wr: &mut fmt::Writer, mut n: uint) -> fmt::Result {
+ const BUF: &'static str = " ";
+
+ while n >= BUF.len() {
+ try!(wr.write_str(BUF));
+ n -= BUF.len();
+ }
+
+ if n > 0 {
+ wr.write_str(BUF[..n])
+ } else {
+ Ok(())
+ }
+}
+
+fn fmt_number_or_null(v: f64) -> string::String {
+ match v.classify() {
+ Fp::Nan | Fp::Infinite => string::String::from_str("null"),
+ _ if v.fract() != 0f64 => f64::to_str_digits(v, 6u),
+ _ => f64::to_str_digits(v, 6u) + ".0",
+ }
+}
+
+/// A structure for implementing serialization to JSON.
+pub struct Encoder<'a> {
+ writer: &'a mut (fmt::Writer+'a),
+}
+
+impl<'a> Encoder<'a> {
+ /// Creates a new JSON encoder whose output will be written to the writer
+ /// specified.
+ pub fn new(writer: &'a mut fmt::Writer) -> Encoder<'a> {
+ Encoder { writer: writer }
+ }
+}
+
+impl<'a> ::Encoder<fmt::Error> for Encoder<'a> {
+ fn emit_nil(&mut self) -> EncodeResult { write!(self.writer, "null") }
+
+ fn emit_uint(&mut self, v: uint) -> EncodeResult { write!(self.writer, "{}", v) }
+ fn emit_u64(&mut self, v: u64) -> EncodeResult { write!(self.writer, "{}", v) }
+ fn emit_u32(&mut self, v: u32) -> EncodeResult { write!(self.writer, "{}", v) }
+ fn emit_u16(&mut self, v: u16) -> EncodeResult { write!(self.writer, "{}", v) }
+ fn emit_u8(&mut self, v: u8) -> EncodeResult { write!(self.writer, "{}", v) }
+
+ fn emit_int(&mut self, v: int) -> EncodeResult { write!(self.writer, "{}", v) }
+ fn emit_i64(&mut self, v: i64) -> EncodeResult { write!(self.writer, "{}", v) }
+ fn emit_i32(&mut self, v: i32) -> EncodeResult { write!(self.writer, "{}", v) }
+ fn emit_i16(&mut self, v: i16) -> EncodeResult { write!(self.writer, "{}", v) }
+ fn emit_i8(&mut self, v: i8) -> EncodeResult { write!(self.writer, "{}", v) }
+
+ fn emit_bool(&mut self, v: bool) -> EncodeResult {
+ if v {
+ write!(self.writer, "true")
+ } else {
+ write!(self.writer, "false")
+ }
+ }
+
+ fn emit_f64(&mut self, v: f64) -> EncodeResult {
+ write!(self.writer, "{}", fmt_number_or_null(v))
+ }
+ fn emit_f32(&mut self, v: f32) -> EncodeResult {
+ self.emit_f64(v as f64)
+ }
+
+ fn emit_char(&mut self, v: char) -> EncodeResult {
+ escape_char(self.writer, v)
+ }
+ fn emit_str(&mut self, v: &str) -> EncodeResult {
+ escape_str(self.writer, v)
+ }
+
+ fn emit_enum<F>(&mut self, _name: &str, f: F) -> EncodeResult where
+ F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
+ {
+ f(self)
+ }
+
+ fn emit_enum_variant<F>(&mut self,
+ name: &str,
+ _id: uint,
+ cnt: uint,
+ f: F) -> EncodeResult where
+ F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
+ {
+ // enums are encoded as strings or objects
+ // Bunny => "Bunny"
+ // Kangaroo(34,"William") => {"variant": "Kangaroo", "fields": [34,"William"]}
+ if cnt == 0 {
+ escape_str(self.writer, name)
+ } else {
+ try!(write!(self.writer, "{{\"variant\":"));
+ try!(escape_str(self.writer, name));
+ try!(write!(self.writer, ",\"fields\":["));
+ try!(f(self));
+ write!(self.writer, "]}}")
+ }
+ }
+
+ fn emit_enum_variant_arg<F>(&mut self, idx: uint, f: F) -> EncodeResult where
+ F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
+ {
+ if idx != 0 {
+ try!(write!(self.writer, ","));
+ }
+ f(self)
+ }
+
+ fn emit_enum_struct_variant<F>(&mut self,
+ name: &str,
+ id: uint,
+ cnt: uint,
+ f: F) -> EncodeResult where
+ F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
+ {
+ self.emit_enum_variant(name, id, cnt, f)
+ }
+
+ fn emit_enum_struct_variant_field<F>(&mut self,
+ _: &str,
+ idx: uint,
+ f: F) -> EncodeResult where
+ F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
+ {
+ self.emit_enum_variant_arg(idx, f)
+ }
+
+ fn emit_struct<F>(&mut self, _: &str, _: uint, f: F) -> EncodeResult where
+ F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
+ {
+ try!(write!(self.writer, "{{"));
+ try!(f(self));
+ write!(self.writer, "}}")
+ }
+
+ fn emit_struct_field<F>(&mut self, name: &str, idx: uint, f: F) -> EncodeResult where
+ F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
+ {
+ if idx != 0 { try!(write!(self.writer, ",")); }
+ try!(escape_str(self.writer, name));
+ try!(write!(self.writer, ":"));
+ f(self)
+ }
+
+ fn emit_tuple<F>(&mut self, len: uint, f: F) -> EncodeResult where
+ F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
+ {
+ self.emit_seq(len, f)
+ }
+ fn emit_tuple_arg<F>(&mut self, idx: uint, f: F) -> EncodeResult where
+ F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
+ {
+ self.emit_seq_elt(idx, f)
+ }
+
+ fn emit_tuple_struct<F>(&mut self, _name: &str, len: uint, f: F) -> EncodeResult where
+ F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
+ {
+ self.emit_seq(len, f)
+ }
+ fn emit_tuple_struct_arg<F>(&mut self, idx: uint, f: F) -> EncodeResult where
+ F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
+ {
+ self.emit_seq_elt(idx, f)
+ }
+
+ fn emit_option<F>(&mut self, f: F) -> EncodeResult where
+ F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
+ {
+ f(self)
+ }
+ fn emit_option_none(&mut self) -> EncodeResult { self.emit_nil() }
+ fn emit_option_some<F>(&mut self, f: F) -> EncodeResult where
+ F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
+ {
+ f(self)
+ }
+
+ fn emit_seq<F>(&mut self, _len: uint, f: F) -> EncodeResult where
+ F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
+ {
+ try!(write!(self.writer, "["));
+ try!(f(self));
+ write!(self.writer, "]")
+ }
+
+ fn emit_seq_elt<F>(&mut self, idx: uint, f: F) -> EncodeResult where
+ F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
+ {
+ if idx != 0 {
+ try!(write!(self.writer, ","));
+ }
+ f(self)
+ }
+
+ fn emit_map<F>(&mut self, _len: uint, f: F) -> EncodeResult where
+ F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
+ {
+ try!(write!(self.writer, "{{"));
+ try!(f(self));
+ write!(self.writer, "}}")
+ }
+
+ fn emit_map_elt_key<F>(&mut self, idx: uint, mut f: F) -> EncodeResult where
+ F: FnMut(&mut Encoder<'a>) -> EncodeResult,
+ {
+ if idx != 0 { try!(write!(self.writer, ",")) }
+ // ref #12967, make sure to wrap a key in double quotes,
+ // in the event that its of a type that omits them (eg numbers)
+ let mut buf = Vec::new();
+ // FIXME(14302) remove the transmute and unsafe block.
+ unsafe {
+ let mut check_encoder = Encoder::new(&mut buf);
+ try!(f(transmute(&mut check_encoder)));
+ }
+ let out = str::from_utf8(buf[]).unwrap();
+ let needs_wrapping = out.char_at(0) != '"' && out.char_at_reverse(out.len()) != '"';
+ if needs_wrapping { try!(write!(self.writer, "\"")); }
+ try!(f(self));
+ if needs_wrapping { try!(write!(self.writer, "\"")); }
+ Ok(())
+ }
+
+ fn emit_map_elt_val<F>(&mut self, _idx: uint, f: F) -> EncodeResult where
+ F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
+ {
+ try!(write!(self.writer, ":"));
+ f(self)
+ }
+}
+
+/// Another encoder for JSON, but prints out human-readable JSON instead of
+/// compact data
+pub struct PrettyEncoder<'a> {
+ writer: &'a mut (fmt::Writer+'a),
+ curr_indent: uint,
+ indent: uint,
+}
+
+impl<'a> PrettyEncoder<'a> {
+ /// Creates a new encoder whose output will be written to the specified writer
+ pub fn new(writer: &'a mut fmt::Writer) -> PrettyEncoder<'a> {
+ PrettyEncoder { writer: writer, curr_indent: 0, indent: 2, }
+ }
+
+ /// Set the number of spaces to indent for each level.
+ /// This is safe to set during encoding.
+ pub fn set_indent(&mut self, indent: uint) {
+ // self.indent very well could be 0 so we need to use checked division.
+ let level = self.curr_indent.checked_div(self.indent).unwrap_or(0);
+ self.indent = indent;
+ self.curr_indent = level * self.indent;
+ }
+}
+
+impl<'a> ::Encoder<fmt::Error> for PrettyEncoder<'a> {
+ fn emit_nil(&mut self) -> EncodeResult { write!(self.writer, "null") }
+
+ fn emit_uint(&mut self, v: uint) -> EncodeResult { write!(self.writer, "{}", v) }
+ fn emit_u64(&mut self, v: u64) -> EncodeResult { write!(self.writer, "{}", v) }
+ fn emit_u32(&mut self, v: u32) -> EncodeResult { write!(self.writer, "{}", v) }
+ fn emit_u16(&mut self, v: u16) -> EncodeResult { write!(self.writer, "{}", v) }
+ fn emit_u8(&mut self, v: u8) -> EncodeResult { write!(self.writer, "{}", v) }
+
+ fn emit_int(&mut self, v: int) -> EncodeResult { write!(self.writer, "{}", v) }
+ fn emit_i64(&mut self, v: i64) -> EncodeResult { write!(self.writer, "{}", v) }
+ fn emit_i32(&mut self, v: i32) -> EncodeResult { write!(self.writer, "{}", v) }
+ fn emit_i16(&mut self, v: i16) -> EncodeResult { write!(self.writer, "{}", v) }
+ fn emit_i8(&mut self, v: i8) -> EncodeResult { write!(self.writer, "{}", v) }
+
+ fn emit_bool(&mut self, v: bool) -> EncodeResult {
+ if v {
+ write!(self.writer, "true")
+ } else {
+ write!(self.writer, "false")
+ }
+ }
+
+ fn emit_f64(&mut self, v: f64) -> EncodeResult {
+ write!(self.writer, "{}", fmt_number_or_null(v))
+ }
+ fn emit_f32(&mut self, v: f32) -> EncodeResult {
+ self.emit_f64(v as f64)
+ }
+
+ fn emit_char(&mut self, v: char) -> EncodeResult {
+ escape_char(self.writer, v)
+ }
+ fn emit_str(&mut self, v: &str) -> EncodeResult {
+ escape_str(self.writer, v)
+ }
+
+ fn emit_enum<F>(&mut self, _name: &str, f: F) -> EncodeResult where
+ F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
+ {
+ f(self)
+ }
+
+ fn emit_enum_variant<F>(&mut self,
+ name: &str,
+ _id: uint,
+ cnt: uint,
+ f: F)
+ -> EncodeResult where
+ F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
+ {
+ if cnt == 0 {
+ escape_str(self.writer, name)
+ } else {
+ try!(write!(self.writer, "{{\n"));
+ self.curr_indent += self.indent;
+ try!(spaces(self.writer, self.curr_indent));
+ try!(write!(self.writer, "\"variant\": "));
+ try!(escape_str(self.writer, name));
+ try!(write!(self.writer, ",\n"));
+ try!(spaces(self.writer, self.curr_indent));
+ try!(write!(self.writer, "\"fields\": [\n"));
+ self.curr_indent += self.indent;
+ try!(f(self));
+ self.curr_indent -= self.indent;
+ try!(write!(self.writer, "\n"));
+ try!(spaces(self.writer, self.curr_indent));
+ self.curr_indent -= self.indent;
+ try!(write!(self.writer, "]\n"));
+ try!(spaces(self.writer, self.curr_indent));
+ write!(self.writer, "}}")
+ }
+ }
+
+ fn emit_enum_variant_arg<F>(&mut self, idx: uint, f: F) -> EncodeResult where
+ F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
+ {
+ if idx != 0 {
+ try!(write!(self.writer, ",\n"));
+ }
+ try!(spaces(self.writer, self.curr_indent));
+ f(self)
+ }
+
+ fn emit_enum_struct_variant<F>(&mut self,
+ name: &str,
+ id: uint,
+ cnt: uint,
+ f: F) -> EncodeResult where
+ F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
+ {
+ self.emit_enum_variant(name, id, cnt, f)
+ }
+
+ fn emit_enum_struct_variant_field<F>(&mut self,
+ _: &str,
+ idx: uint,
+ f: F) -> EncodeResult where
+ F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
+ {
+ self.emit_enum_variant_arg(idx, f)
+ }
+
+
+ fn emit_struct<F>(&mut self, _: &str, len: uint, f: F) -> EncodeResult where
+ F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
+ {
+ if len == 0 {
+ write!(self.writer, "{{}}")
+ } else {
+ try!(write!(self.writer, "{{"));
+ self.curr_indent += self.indent;
+ try!(f(self));
+ self.curr_indent -= self.indent;
+ try!(write!(self.writer, "\n"));
+ try!(spaces(self.writer, self.curr_indent));
+ write!(self.writer, "}}")
+ }
+ }
+
+ fn emit_struct_field<F>(&mut self, name: &str, idx: uint, f: F) -> EncodeResult where
+ F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
+ {
+ if idx == 0 {
+ try!(write!(self.writer, "\n"));
+ } else {
+ try!(write!(self.writer, ",\n"));
+ }
+ try!(spaces(self.writer, self.curr_indent));
+ try!(escape_str(self.writer, name));
+ try!(write!(self.writer, ": "));
+ f(self)
+ }
+
+ fn emit_tuple<F>(&mut self, len: uint, f: F) -> EncodeResult where
+ F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
+ {
+ self.emit_seq(len, f)
+ }
+ fn emit_tuple_arg<F>(&mut self, idx: uint, f: F) -> EncodeResult where
+ F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
+ {
+ self.emit_seq_elt(idx, f)
+ }
+
+ fn emit_tuple_struct<F>(&mut self, _: &str, len: uint, f: F) -> EncodeResult where
+ F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
+ {
+ self.emit_seq(len, f)
+ }
+ fn emit_tuple_struct_arg<F>(&mut self, idx: uint, f: F) -> EncodeResult where
+ F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
+ {
+ self.emit_seq_elt(idx, f)
+ }
+
+ fn emit_option<F>(&mut self, f: F) -> EncodeResult where
+ F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
+ {
+ f(self)
+ }
+ fn emit_option_none(&mut self) -> EncodeResult { self.emit_nil() }
+ fn emit_option_some<F>(&mut self, f: F) -> EncodeResult where
+ F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
+ {
+ f(self)
+ }
+
+ fn emit_seq<F>(&mut self, len: uint, f: F) -> EncodeResult where
+ F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
+ {
+ if len == 0 {
+ write!(self.writer, "[]")
+ } else {
+ try!(write!(self.writer, "["));
+ self.curr_indent += self.indent;
+ try!(f(self));
+ self.curr_indent -= self.indent;
+ try!(write!(self.writer, "\n"));
+ try!(spaces(self.writer, self.curr_indent));
+ write!(self.writer, "]")
+ }
+ }
+
+ fn emit_seq_elt<F>(&mut self, idx: uint, f: F) -> EncodeResult where
+ F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
+ {
+ if idx == 0 {
+ try!(write!(self.writer, "\n"));
+ } else {
+ try!(write!(self.writer, ",\n"));
+ }
+ try!(spaces(self.writer, self.curr_indent));
+ f(self)
+ }
+
+ fn emit_map<F>(&mut self, len: uint, f: F) -> EncodeResult where
+ F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
+ {
+ if len == 0 {
+ write!(self.writer, "{{}}")
+ } else {
+ try!(write!(self.writer, "{{"));
+ self.curr_indent += self.indent;
+ try!(f(self));
+ self.curr_indent -= self.indent;
+ try!(write!(self.writer, "\n"));
+ try!(spaces(self.writer, self.curr_indent));
+ write!(self.writer, "}}")
+ }
+ }
+
+ fn emit_map_elt_key<F>(&mut self, idx: uint, mut f: F) -> EncodeResult where
+ F: FnMut(&mut PrettyEncoder<'a>) -> EncodeResult,
+ {
+ if idx == 0 {
+ try!(write!(self.writer, "\n"));
+ } else {
+ try!(write!(self.writer, ",\n"));
+ }
+ try!(spaces(self.writer, self.curr_indent));
+ // ref #12967, make sure to wrap a key in double quotes,
+ // in the event that its of a type that omits them (eg numbers)
+ let mut buf = Vec::new();
+ // FIXME(14302) remove the transmute and unsafe block.
+ unsafe {
+ let mut check_encoder = PrettyEncoder::new(&mut buf);
+ try!(f(transmute(&mut check_encoder)));
+ }
+ let out = str::from_utf8(buf[]).unwrap();
+ let needs_wrapping = out.char_at(0) != '"' && out.char_at_reverse(out.len()) != '"';
+ if needs_wrapping { try!(write!(self.writer, "\"")); }
+ try!(f(self));
+ if needs_wrapping { try!(write!(self.writer, "\"")); }
+ Ok(())
+ }
+
+ fn emit_map_elt_val<F>(&mut self, _idx: uint, f: F) -> EncodeResult where
+ F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
+ {
+ try!(write!(self.writer, ": "));
+ f(self)
+ }
+}
+
+impl<E: ::Encoder<S>, S> Encodable<E, S> for Json {
+ fn encode(&self, e: &mut E) -> Result<(), S> {
+ match *self {
+ Json::I64(v) => v.encode(e),
+ Json::U64(v) => v.encode(e),
+ Json::F64(v) => v.encode(e),
+ Json::String(ref v) => v.encode(e),
+ Json::Boolean(v) => v.encode(e),
+ Json::Array(ref v) => v.encode(e),
+ Json::Object(ref v) => v.encode(e),
+ Json::Null => e.emit_nil(),
+ }
+ }
+}
+
+/// Create an `AsJson` wrapper which can be used to print a value as JSON
+/// on-the-fly via `write!`
+pub fn as_json<T>(t: &T) -> AsJson<T> {
+ AsJson { inner: t }
+}
+
+/// Create an `AsPrettyJson` wrapper which can be used to print a value as JSON
+/// on-the-fly via `write!`
+pub fn as_pretty_json<T>(t: &T) -> AsPrettyJson<T> {
+ AsPrettyJson { inner: t, indent: None }
+}
+
+impl Json {
+ /// Borrow this json object as a pretty object to generate a pretty
+ /// representation for it via `Show`.
+ pub fn pretty(&self) -> PrettyJson {
+ PrettyJson { inner: self }
+ }
+
+ /// If the Json value is an Object, returns the value associated with the provided key.
+ /// Otherwise, returns None.
+ pub fn find<'a>(&'a self, key: &str) -> Option<&'a Json>{
+ match self {
+ &Json::Object(ref map) => map.get(key),
+ _ => None
+ }
+ }
+
+ /// Attempts to get a nested Json Object for each key in `keys`.
+ /// If any key is found not to exist, find_path will return None.
+ /// Otherwise, it will return the Json value associated with the final key.
+ pub fn find_path<'a>(&'a self, keys: &[&str]) -> Option<&'a Json>{
+ let mut target = self;
+ for key in keys.iter() {
+ match target.find(*key) {
+ Some(t) => { target = t; },
+ None => return None
+ }
+ }
+ Some(target)
+ }
+
+ /// If the Json value is an Object, performs a depth-first search until
+ /// a value associated with the provided key is found. If no value is found
+ /// or the Json value is not an Object, returns None.
+ pub fn search<'a>(&'a self, key: &str) -> Option<&'a Json> {
+ match self {
+ &Json::Object(ref map) => {
+ match map.get(key) {
+ Some(json_value) => Some(json_value),
+ None => {
+ for (_, v) in map.iter() {
+ match v.search(key) {
+ x if x.is_some() => return x,
+ _ => ()
+ }
+ }
+ None
+ }
+ }
+ },
+ _ => None
+ }
+ }
+
+ /// Returns true if the Json value is an Object. Returns false otherwise.
+ pub fn is_object<'a>(&'a self) -> bool {
+ self.as_object().is_some()
+ }
+
+ /// If the Json value is an Object, returns the associated BTreeMap.
+ /// Returns None otherwise.
+ pub fn as_object<'a>(&'a self) -> Option<&'a Object> {
+ match self {
+ &Json::Object(ref map) => Some(map),
+ _ => None
+ }
+ }
+
+ /// Returns true if the Json value is an Array. Returns false otherwise.
+ pub fn is_array<'a>(&'a self) -> bool {
+ self.as_array().is_some()
+ }
+
+ /// If the Json value is an Array, returns the associated vector.
+ /// Returns None otherwise.
+ pub fn as_array<'a>(&'a self) -> Option<&'a Array> {
+ match self {
+ &Json::Array(ref array) => Some(&*array),
+ _ => None
+ }
+ }
+
+ /// Returns true if the Json value is a String. Returns false otherwise.
+ pub fn is_string<'a>(&'a self) -> bool {
+ self.as_string().is_some()
+ }
+
+ /// If the Json value is a String, returns the associated str.
+ /// Returns None otherwise.
+ pub fn as_string<'a>(&'a self) -> Option<&'a str> {
+ match *self {
+ Json::String(ref s) => Some(s[]),
+ _ => None
+ }
+ }
+
+ /// Returns true if the Json value is a Number. Returns false otherwise.
+ pub fn is_number(&self) -> bool {
+ match *self {
+ Json::I64(_) | Json::U64(_) | Json::F64(_) => true,
+ _ => false,
+ }
+ }
+
+ /// Returns true if the Json value is a i64. Returns false otherwise.
+ pub fn is_i64(&self) -> bool {
+ match *self {
+ Json::I64(_) => true,
+ _ => false,
+ }
+ }
+
+ /// Returns true if the Json value is a u64. Returns false otherwise.
+ pub fn is_u64(&self) -> bool {
+ match *self {
+ Json::U64(_) => true,
+ _ => false,
+ }
+ }
+
+ /// Returns true if the Json value is a f64. Returns false otherwise.
+ pub fn is_f64(&self) -> bool {
+ match *self {
+ Json::F64(_) => true,
+ _ => false,
+ }
+ }
+
+ /// If the Json value is a number, return or cast it to a i64.
+ /// Returns None otherwise.
+ pub fn as_i64(&self) -> Option<i64> {
+ match *self {
+ Json::I64(n) => Some(n),
+ Json::U64(n) => num::cast(n),
+ _ => None
+ }
+ }
+
+ /// If the Json value is a number, return or cast it to a u64.
+ /// Returns None otherwise.
+ pub fn as_u64(&self) -> Option<u64> {
+ match *self {
+ Json::I64(n) => num::cast(n),
+ Json::U64(n) => Some(n),
+ _ => None
+ }
+ }
+
+ /// If the Json value is a number, return or cast it to a f64.
+ /// Returns None otherwise.
+ pub fn as_f64(&self) -> Option<f64> {
+ match *self {
+ Json::I64(n) => num::cast(n),
+ Json::U64(n) => num::cast(n),
+ Json::F64(n) => Some(n),
+ _ => None
+ }
+ }
+
+ /// Returns true if the Json value is a Boolean. Returns false otherwise.
+ pub fn is_boolean(&self) -> bool {
+ self.as_boolean().is_some()
+ }
+
+ /// If the Json value is a Boolean, returns the associated bool.
+ /// Returns None otherwise.
+ pub fn as_boolean(&self) -> Option<bool> {
+ match self {
+ &Json::Boolean(b) => Some(b),
+ _ => None
+ }
+ }
+
+ /// Returns true if the Json value is a Null. Returns false otherwise.
+ pub fn is_null(&self) -> bool {
+ self.as_null().is_some()
+ }
+
+ /// If the Json value is a Null, returns ().
+ /// Returns None otherwise.
+ pub fn as_null(&self) -> Option<()> {
+ match self {
+ &Json::Null => Some(()),
+ _ => None
+ }
+ }
+}
+
+// NOTE(stage0): remove impl after a snapshot
+#[cfg(stage0)]
+impl<'a> ops::Index<&'a str, Json> for Json {
+ fn index(&self, idx: & &str) -> &Json {
+ self.find(*idx).unwrap()
+ }
+}
+
+#[cfg(not(stage0))] // NOTE(stage0): remove cfg after a snapshot
+impl<'a> ops::Index<&'a str> for Json {
+ type Output = Json;
+
+ fn index(&self, idx: & &str) -> &Json {
+ self.find(*idx).unwrap()
+ }
+}
+
+// NOTE(stage0): remove impl after a snapshot
+#[cfg(stage0)]
+impl ops::Index<uint, Json> for Json {
+ fn index<'a>(&'a self, idx: &uint) -> &'a Json {
+ match self {
+ &Json::Array(ref v) => v.index(idx),
+ _ => panic!("can only index Json with uint if it is an array")
+ }
+ }
+}
+
+#[cfg(not(stage0))] // NOTE(stage0): remove cfg after a snapshot
+impl ops::Index<uint> for Json {
+ type Output = Json;
+
+ fn index<'a>(&'a self, idx: &uint) -> &'a Json {
+ match self {
+ &Json::Array(ref v) => v.index(idx),
+ _ => panic!("can only index Json with uint if it is an array")
+ }
+ }
+}
+
+/// The output of the streaming parser.
+#[derive(PartialEq, Clone, Show)]
+pub enum JsonEvent {
+ ObjectStart,
+ ObjectEnd,
+ ArrayStart,
+ ArrayEnd,
+ BooleanValue(bool),
+ I64Value(i64),
+ U64Value(u64),
+ F64Value(f64),
+ StringValue(string::String),
+ NullValue,
+ Error(ParserError),
+}
+
+#[derive(PartialEq, Show)]
+enum ParserState {
+ // Parse a value in an array, true means first element.
+ ParseArray(bool),
+ // Parse ',' or ']' after an element in an array.
+ ParseArrayComma,
+ // Parse a key:value in an object, true means first element.
+ ParseObject(bool),
+ // Parse ',' or ']' after an element in an object.
+ ParseObjectComma,
+ // Initial state.
+ ParseStart,
+ // Expecting the stream to end.
+ ParseBeforeFinish,
+ // Parsing can't continue.
+ ParseFinished,
+}
+
+/// A Stack represents the current position of the parser in the logical
+/// structure of the JSON stream.
+/// For example foo.bar[3].x
+pub struct Stack {
+ stack: Vec<InternalStackElement>,
+ str_buffer: Vec<u8>,
+}
+
+/// StackElements compose a Stack.
+/// For example, Key("foo"), Key("bar"), Index(3) and Key("x") are the
+/// StackElements compositing the stack that represents foo.bar[3].x
+#[derive(PartialEq, Clone, Show)]
+pub enum StackElement<'l> {
+ Index(u32),
+ Key(&'l str),
+}
+
+// Internally, Key elements are stored as indices in a buffer to avoid
+// allocating a string for every member of an object.
+#[derive(PartialEq, Clone, Show)]
+enum InternalStackElement {
+ InternalIndex(u32),
+ InternalKey(u16, u16), // start, size
+}
+
+impl Stack {
+ pub fn new() -> Stack {
+ Stack { stack: Vec::new(), str_buffer: Vec::new() }
+ }
+
+ /// Returns The number of elements in the Stack.
+ pub fn len(&self) -> uint { self.stack.len() }
+
+ /// Returns true if the stack is empty.
+ pub fn is_empty(&self) -> bool { self.stack.is_empty() }
+
+ /// Provides access to the StackElement at a given index.
+ /// lower indices are at the bottom of the stack while higher indices are
+ /// at the top.
+ pub fn get<'l>(&'l self, idx: uint) -> StackElement<'l> {
+ match self.stack[idx] {
+ InternalIndex(i) => Index(i),
+ InternalKey(start, size) => {
+ Key(str::from_utf8(
+ self.str_buffer[start as uint .. start as uint + size as uint]).unwrap())
+ }
+ }
+ }
+
+ /// Compares this stack with an array of StackElements.
+ pub fn is_equal_to(&self, rhs: &[StackElement]) -> bool {
+ if self.stack.len() != rhs.len() { return false; }
+ for i in range(0, rhs.len()) {
+ if self.get(i) != rhs[i] { return false; }
+ }
+ return true;
+ }
+
+ /// Returns true if the bottom-most elements of this stack are the same as
+ /// the ones passed as parameter.
+ pub fn starts_with(&self, rhs: &[StackElement]) -> bool {
+ if self.stack.len() < rhs.len() { return false; }
+ for i in range(0, rhs.len()) {
+ if self.get(i) != rhs[i] { return false; }
+ }
+ return true;
+ }
+
+ /// Returns true if the top-most elements of this stack are the same as
+ /// the ones passed as parameter.
+ pub fn ends_with(&self, rhs: &[StackElement]) -> bool {
+ if self.stack.len() < rhs.len() { return false; }
+ let offset = self.stack.len() - rhs.len();
+ for i in range(0, rhs.len()) {
+ if self.get(i + offset) != rhs[i] { return false; }
+ }
+ return true;
+ }
+
+ /// Returns the top-most element (if any).
+ pub fn top<'l>(&'l self) -> Option<StackElement<'l>> {
+ return match self.stack.last() {
+ None => None,
+ Some(&InternalIndex(i)) => Some(Index(i)),
+ Some(&InternalKey(start, size)) => {
+ Some(Key(str::from_utf8(
+ self.str_buffer[start as uint .. (start+size) as uint]
+ ).unwrap()))
+ }
+ }
+ }
+
+ // Used by Parser to insert Key elements at the top of the stack.
+ fn push_key(&mut self, key: string::String) {
+ self.stack.push(InternalKey(self.str_buffer.len() as u16, key.len() as u16));
+ for c in key.as_bytes().iter() {
+ self.str_buffer.push(*c);
+ }
+ }
+
+ // Used by Parser to insert Index elements at the top of the stack.
+ fn push_index(&mut self, index: u32) {
+ self.stack.push(InternalIndex(index));
+ }
+
+ // Used by Parser to remove the top-most element of the stack.
+ fn pop(&mut self) {
+ assert!(!self.is_empty());
+ match *self.stack.last().unwrap() {
+ InternalKey(_, sz) => {
+ let new_size = self.str_buffer.len() - sz as uint;
+ self.str_buffer.truncate(new_size);
+ }
+ InternalIndex(_) => {}
+ }
+ self.stack.pop();
+ }
+
+ // Used by Parser to test whether the top-most element is an index.
+ fn last_is_index(&self) -> bool {
+ if self.is_empty() { return false; }
+ return match *self.stack.last().unwrap() {
+ InternalIndex(_) => true,
+ _ => false,
+ }
+ }
+
+ // Used by Parser to increment the index of the top-most element.
+ fn bump_index(&mut self) {
+ let len = self.stack.len();
+ let idx = match *self.stack.last().unwrap() {
+ InternalIndex(i) => { i + 1 }
+ _ => { panic!(); }
+ };
+ self.stack[len - 1] = InternalIndex(idx);
+ }
+}
+
+/// A streaming JSON parser implemented as an iterator of JsonEvent, consuming
+/// an iterator of char.
+pub struct Parser<T> {
+ rdr: T,
+ ch: Option<char>,
+ line: uint,
+ col: uint,
+ // We maintain a stack representing where we are in the logical structure
+ // of the JSON stream.
+ stack: Stack,
+ // A state machine is kept to make it possible to interrupt and resume parsing.
+ state: ParserState,
+}
+
+impl<T: Iterator<Item=char>> Iterator for Parser<T> {
+ type Item = JsonEvent;
+
+ fn next(&mut self) -> Option<JsonEvent> {
+ if self.state == ParseFinished {
+ return None;
+ }
+
+ if self.state == ParseBeforeFinish {
+ self.parse_whitespace();
+ // Make sure there is no trailing characters.
+ if self.eof() {
+ self.state = ParseFinished;
+ return None;
+ } else {
+ return Some(self.error_event(TrailingCharacters));
+ }
+ }
+
+ return Some(self.parse());
+ }
+}
+
+impl<T: Iterator<Item=char>> Parser<T> {
+ /// Creates the JSON parser.
+ pub fn new(rdr: T) -> Parser<T> {
+ let mut p = Parser {
+ rdr: rdr,
+ ch: Some('\x00'),
+ line: 1,
+ col: 0,
+ stack: Stack::new(),
+ state: ParseStart,
+ };
+ p.bump();
+ return p;
+ }
+
+ /// Provides access to the current position in the logical structure of the
+ /// JSON stream.
+ pub fn stack<'l>(&'l self) -> &'l Stack {
+ return &self.stack;
+ }
+
+ fn eof(&self) -> bool { self.ch.is_none() }
+ fn ch_or_null(&self) -> char { self.ch.unwrap_or('\x00') }
+ fn bump(&mut self) {
+ self.ch = self.rdr.next();
+
+ if self.ch_is('\n') {
+ self.line += 1u;
+ self.col = 1u;
+ } else {
+ self.col += 1u;
+ }
+ }
+
+ fn next_char(&mut self) -> Option<char> {
+ self.bump();
+ self.ch
+ }
+ fn ch_is(&self, c: char) -> bool {
+ self.ch == Some(c)
+ }
+
+ fn error<T>(&self, reason: ErrorCode) -> Result<T, ParserError> {
+ Err(SyntaxError(reason, self.line, self.col))
+ }
+
+ fn parse_whitespace(&mut self) {
+ while self.ch_is(' ') ||
+ self.ch_is('\n') ||
+ self.ch_is('\t') ||
+ self.ch_is('\r') { self.bump(); }
+ }
+
+ fn parse_number(&mut self) -> JsonEvent {
+ let mut neg = false;
+
+ if self.ch_is('-') {
+ self.bump();
+ neg = true;
+ }
+
+ let res = match self.parse_u64() {
+ Ok(res) => res,
+ Err(e) => { return Error(e); }
+ };
+
+ if self.ch_is('.') || self.ch_is('e') || self.ch_is('E') {
+ let mut res = res as f64;
+
+ if self.ch_is('.') {
+ res = match self.parse_decimal(res) {
+ Ok(res) => res,
+ Err(e) => { return Error(e); }
+ };
+ }
+
+ if self.ch_is('e') || self.ch_is('E') {
+ res = match self.parse_exponent(res) {
+ Ok(res) => res,
+ Err(e) => { return Error(e); }
+ };
+ }
+
+ if neg {
+ res *= -1.0;
+ }
+
+ F64Value(res)
+ } else {
+ if neg {
+ let res = -(res as i64);
+
+ // Make sure we didn't underflow.
+ if res > 0 {
+ Error(SyntaxError(InvalidNumber, self.line, self.col))
+ } else {
+ I64Value(res)
+ }
+ } else {
+ U64Value(res)
+ }
+ }
+ }
+
+ fn parse_u64(&mut self) -> Result<u64, ParserError> {
+ let mut accum = 0;
+ let last_accum = 0; // necessary to detect overflow.
+
+ match self.ch_or_null() {
+ '0' => {
+ self.bump();
+
+ // A leading '0' must be the only digit before the decimal point.
+ match self.ch_or_null() {
+ '0' ... '9' => return self.error(InvalidNumber),
+ _ => ()
+ }
+ },
+ '1' ... '9' => {
+ while !self.eof() {
+ match self.ch_or_null() {
+ c @ '0' ... '9' => {
+ accum *= 10;
+ accum += (c as u64) - ('0' as u64);
+
+ // Detect overflow by comparing to the last value.
+ if accum <= last_accum { return self.error(InvalidNumber); }
+
+ self.bump();
+ }
+ _ => break,
+ }
+ }
+ }
+ _ => return self.error(InvalidNumber),
+ }
+
+ Ok(accum)
+ }
+
+ fn parse_decimal(&mut self, mut res: f64) -> Result<f64, ParserError> {
+ self.bump();
+
+ // Make sure a digit follows the decimal place.
+ match self.ch_or_null() {
+ '0' ... '9' => (),
+ _ => return self.error(InvalidNumber)
+ }
+
+ let mut dec = 1.0;
+ while !self.eof() {
+ match self.ch_or_null() {
+ c @ '0' ... '9' => {
+ dec /= 10.0;
+ res += (((c as int) - ('0' as int)) as f64) * dec;
+ self.bump();
+ }
+ _ => break,
+ }
+ }
+
+ Ok(res)
+ }
+
+ fn parse_exponent(&mut self, mut res: f64) -> Result<f64, ParserError> {
+ self.bump();
+
+ let mut exp = 0u;
+ let mut neg_exp = false;
+
+ if self.ch_is('+') {
+ self.bump();
+ } else if self.ch_is('-') {
+ self.bump();
+ neg_exp = true;
+ }
+
+ // Make sure a digit follows the exponent place.
+ match self.ch_or_null() {
+ '0' ... '9' => (),
+ _ => return self.error(InvalidNumber)
+ }
+ while !self.eof() {
+ match self.ch_or_null() {
+ c @ '0' ... '9' => {
+ exp *= 10;
+ exp += (c as uint) - ('0' as uint);
+
+ self.bump();
+ }
+ _ => break
+ }
+ }
+
+ let exp = 10_f64.powi(exp as i32);
+ if neg_exp {
+ res /= exp;
+ } else {
+ res *= exp;
+ }
+
+ Ok(res)
+ }
+
+ fn decode_hex_escape(&mut self) -> Result<u16, ParserError> {
+ let mut i = 0u;
+ let mut n = 0u16;
+ while i < 4 && !self.eof() {
+ self.bump();
+ n = match self.ch_or_null() {
+ c @ '0' ... '9' => n * 16 + ((c as u16) - ('0' as u16)),
+ 'a' | 'A' => n * 16 + 10,
+ 'b' | 'B' => n * 16 + 11,
+ 'c' | 'C' => n * 16 + 12,
+ 'd' | 'D' => n * 16 + 13,
+ 'e' | 'E' => n * 16 + 14,
+ 'f' | 'F' => n * 16 + 15,
+ _ => return self.error(InvalidEscape)
+ };
+
+ i += 1u;
+ }
+
+ // Error out if we didn't parse 4 digits.
+ if i != 4 {
+ return self.error(InvalidEscape);
+ }
+
+ Ok(n)
+ }
+
+ fn parse_str(&mut self) -> Result<string::String, ParserError> {
+ let mut escape = false;
+ let mut res = string::String::new();
+
+ loop {
+ self.bump();
+ if self.eof() {
+ return self.error(EOFWhileParsingString);
+ }
+
+ if escape {
+ match self.ch_or_null() {
+ '"' => res.push('"'),
+ '\\' => res.push('\\'),
+ '/' => res.push('/'),
+ 'b' => res.push('\x08'),
+ 'f' => res.push('\x0c'),
+ 'n' => res.push('\n'),
+ 'r' => res.push('\r'),
+ 't' => res.push('\t'),
+ 'u' => match try!(self.decode_hex_escape()) {
+ 0xDC00 ... 0xDFFF => {
+ return self.error(LoneLeadingSurrogateInHexEscape)
+ }
+
+ // Non-BMP characters are encoded as a sequence of
+ // two hex escapes, representing UTF-16 surrogates.
+ n1 @ 0xD800 ... 0xDBFF => {
+ match (self.next_char(), self.next_char()) {
+ (Some('\\'), Some('u')) => (),
+ _ => return self.error(UnexpectedEndOfHexEscape),
+ }
+
+ let buf = [n1, try!(self.decode_hex_escape())];
+ match unicode_str::utf16_items(&buf).next() {
+ Some(Utf16Item::ScalarValue(c)) => res.push(c),
+ _ => return self.error(LoneLeadingSurrogateInHexEscape),
+ }
+ }
+
+ n => match char::from_u32(n as u32) {
+ Some(c) => res.push(c),
+ None => return self.error(InvalidUnicodeCodePoint),
+ },
+ },
+ _ => return self.error(InvalidEscape),
+ }
+ escape = false;
+ } else if self.ch_is('\\') {
+ escape = true;
+ } else {
+ match self.ch {
+ Some('"') => {
+ self.bump();
+ return Ok(res);
+ },
+ Some(c) => res.push(c),
+ None => unreachable!()
+ }
+ }
+ }
+ }
+
+ // Invoked at each iteration, consumes the stream until it has enough
+ // information to return a JsonEvent.
+ // Manages an internal state so that parsing can be interrupted and resumed.
+ // Also keeps track of the position in the logical structure of the json
+ // stream int the form of a stack that can be queried by the user using the
+ // stack() method.
+ fn parse(&mut self) -> JsonEvent {
+ loop {
+ // The only paths where the loop can spin a new iteration
+ // are in the cases ParseArrayComma and ParseObjectComma if ','
+ // is parsed. In these cases the state is set to (respectively)
+ // ParseArray(false) and ParseObject(false), which always return,
+ // so there is no risk of getting stuck in an infinite loop.
+ // All other paths return before the end of the loop's iteration.
+ self.parse_whitespace();
+
+ match self.state {
+ ParseStart => {
+ return self.parse_start();
+ }
+ ParseArray(first) => {
+ return self.parse_array(first);
+ }
+ ParseArrayComma => {
+ match self.parse_array_comma_or_end() {
+ Some(evt) => { return evt; }
+ None => {}
+ }
+ }
+ ParseObject(first) => {
+ return self.parse_object(first);
+ }
+ ParseObjectComma => {
+ self.stack.pop();
+ if self.ch_is(',') {
+ self.state = ParseObject(false);
+ self.bump();
+ } else {
+ return self.parse_object_end();
+ }
+ }
+ _ => {
+ return self.error_event(InvalidSyntax);
+ }
+ }
+ }
+ }
+
+ fn parse_start(&mut self) -> JsonEvent {
+ let val = self.parse_value();
+ self.state = match val {
+ Error(_) => ParseFinished,
+ ArrayStart => ParseArray(true),
+ ObjectStart => ParseObject(true),
+ _ => ParseBeforeFinish,
+ };
+ return val;
+ }
+
+ fn parse_array(&mut self, first: bool) -> JsonEvent {
+ if self.ch_is(']') {
+ if !first {
+ self.error_event(InvalidSyntax)
+ } else {
+ self.state = if self.stack.is_empty() {
+ ParseBeforeFinish
+ } else if self.stack.last_is_index() {
+ ParseArrayComma
+ } else {
+ ParseObjectComma
+ };
+ self.bump();
+ ArrayEnd
+ }
+ } else {
+ if first {
+ self.stack.push_index(0);
+ }
+ let val = self.parse_value();
+ self.state = match val {
+ Error(_) => ParseFinished,
+ ArrayStart => ParseArray(true),
+ ObjectStart => ParseObject(true),
+ _ => ParseArrayComma,
+ };
+ val
+ }
+ }
+
+ fn parse_array_comma_or_end(&mut self) -> Option<JsonEvent> {
+ if self.ch_is(',') {
+ self.stack.bump_index();
+ self.state = ParseArray(false);
+ self.bump();
+ None
+ } else if self.ch_is(']') {
+ self.stack.pop();
+ self.state = if self.stack.is_empty() {
+ ParseBeforeFinish
+ } else if self.stack.last_is_index() {
+ ParseArrayComma
+ } else {
+ ParseObjectComma
+ };
+ self.bump();
+ Some(ArrayEnd)
+ } else if self.eof() {
+ Some(self.error_event(EOFWhileParsingArray))
+ } else {
+ Some(self.error_event(InvalidSyntax))
+ }
+ }
+
+ fn parse_object(&mut self, first: bool) -> JsonEvent {
+ if self.ch_is('}') {
+ if !first {
+ if self.stack.is_empty() {
+ return self.error_event(TrailingComma);
+ } else {
+ self.stack.pop();
+ }
+ }
+ self.state = if self.stack.is_empty() {
+ ParseBeforeFinish
+ } else if self.stack.last_is_index() {
+ ParseArrayComma
+ } else {
+ ParseObjectComma
+ };
+ self.bump();
+ return ObjectEnd;
+ }
+ if self.eof() {
+ return self.error_event(EOFWhileParsingObject);
+ }
+ if !self.ch_is('"') {
+ return self.error_event(KeyMustBeAString);
+ }
+ let s = match self.parse_str() {
+ Ok(s) => s,
+ Err(e) => {
+ self.state = ParseFinished;
+ return Error(e);
+ }
+ };
+ self.parse_whitespace();
+ if self.eof() {
+ return self.error_event(EOFWhileParsingObject);
+ } else if self.ch_or_null() != ':' {
+ return self.error_event(ExpectedColon);
+ }
+ self.stack.push_key(s);
+ self.bump();
+ self.parse_whitespace();
+
+ let val = self.parse_value();
+
+ self.state = match val {
+ Error(_) => ParseFinished,
+ ArrayStart => ParseArray(true),
+ ObjectStart => ParseObject(true),
+ _ => ParseObjectComma,
+ };
+ return val;
+ }
+
+ fn parse_object_end(&mut self) -> JsonEvent {
+ if self.ch_is('}') {
+ self.state = if self.stack.is_empty() {
+ ParseBeforeFinish
+ } else if self.stack.last_is_index() {
+ ParseArrayComma
+ } else {
+ ParseObjectComma
+ };
+ self.bump();
+ ObjectEnd
+ } else if self.eof() {
+ self.error_event(EOFWhileParsingObject)
+ } else {
+ self.error_event(InvalidSyntax)
+ }
+ }
+
+ fn parse_value(&mut self) -> JsonEvent {
+ if self.eof() { return self.error_event(EOFWhileParsingValue); }
+ match self.ch_or_null() {
+ 'n' => { self.parse_ident("ull", NullValue) }
+ 't' => { self.parse_ident("rue", BooleanValue(true)) }
+ 'f' => { self.parse_ident("alse", BooleanValue(false)) }
+ '0' ... '9' | '-' => self.parse_number(),
+ '"' => match self.parse_str() {
+ Ok(s) => StringValue(s),
+ Err(e) => Error(e),
+ },
+ '[' => {
+ self.bump();
+ ArrayStart
+ }
+ '{' => {
+ self.bump();
+ ObjectStart
+ }
+ _ => { self.error_event(InvalidSyntax) }
+ }
+ }
+
+ fn parse_ident(&mut self, ident: &str, value: JsonEvent) -> JsonEvent {
+ if ident.chars().all(|c| Some(c) == self.next_char()) {
+ self.bump();
+ value
+ } else {
+ Error(SyntaxError(InvalidSyntax, self.line, self.col))
+ }
+ }
+
+ fn error_event(&mut self, reason: ErrorCode) -> JsonEvent {
+ self.state = ParseFinished;
+ Error(SyntaxError(reason, self.line, self.col))
+ }
+}
+
+/// A Builder consumes a json::Parser to create a generic Json structure.
+pub struct Builder<T> {
+ parser: Parser<T>,
+ token: Option<JsonEvent>,
+}
+
+impl<T: Iterator<Item=char>> Builder<T> {
+ /// Create a JSON Builder.
+ pub fn new(src: T) -> Builder<T> {
+ Builder { parser: Parser::new(src), token: None, }
+ }
+
+ // Decode a Json value from a Parser.
+ pub fn build(&mut self) -> Result<Json, BuilderError> {
+ self.bump();
+ let result = self.build_value();
+ self.bump();
+ match self.token {
+ None => {}
+ Some(Error(e)) => { return Err(e); }
+ ref tok => { panic!("unexpected token {}", tok.clone()); }
+ }
+ result
+ }
+
+ fn bump(&mut self) {
+ self.token = self.parser.next();
+ }
+
+ fn build_value(&mut self) -> Result<Json, BuilderError> {
+ return match self.token {
+ Some(NullValue) => Ok(Json::Null),
+ Some(I64Value(n)) => Ok(Json::I64(n)),
+ Some(U64Value(n)) => Ok(Json::U64(n)),
+ Some(F64Value(n)) => Ok(Json::F64(n)),
+ Some(BooleanValue(b)) => Ok(Json::Boolean(b)),
+ Some(StringValue(ref mut s)) => {
+ let mut temp = string::String::new();
+ swap(s, &mut temp);
+ Ok(Json::String(temp))
+ }
+ Some(Error(e)) => Err(e),
+ Some(ArrayStart) => self.build_array(),
+ Some(ObjectStart) => self.build_object(),
+ Some(ObjectEnd) => self.parser.error(InvalidSyntax),
+ Some(ArrayEnd) => self.parser.error(InvalidSyntax),
+ None => self.parser.error(EOFWhileParsingValue),
+ }
+ }
+
+ fn build_array(&mut self) -> Result<Json, BuilderError> {
+ self.bump();
+ let mut values = Vec::new();
+
+ loop {
+ if self.token == Some(ArrayEnd) {
+ return Ok(Json::Array(values.into_iter().collect()));
+ }
+ match self.build_value() {
+ Ok(v) => values.push(v),
+ Err(e) => { return Err(e) }
+ }
+ self.bump();
+ }
+ }
+
+ fn build_object(&mut self) -> Result<Json, BuilderError> {
+ self.bump();
+
+ let mut values = BTreeMap::new();
+
+ loop {
+ match self.token {
+ Some(ObjectEnd) => { return Ok(Json::Object(values)); }
+ Some(Error(e)) => { return Err(e); }
+ None => { break; }
+ _ => {}
+ }
+ let key = match self.parser.stack().top() {
+ Some(Key(k)) => { k.to_string() }
+ _ => { panic!("invalid state"); }
+ };
+ match self.build_value() {
+ Ok(value) => { values.insert(key, value); }
+ Err(e) => { return Err(e); }
+ }
+ self.bump();
+ }
+ return self.parser.error(EOFWhileParsingObject);
+ }
+}
+
+/// Decodes a json value from an `&mut io::Reader`
+pub fn from_reader(rdr: &mut io::Reader) -> Result<Json, BuilderError> {
+ let contents = match rdr.read_to_end() {
+ Ok(c) => c,
+ Err(e) => return Err(io_error_to_error(e))
+ };
+ let s = match str::from_utf8(contents.as_slice()).ok() {
+ Some(s) => s,
+ _ => return Err(SyntaxError(NotUtf8, 0, 0))
+ };
+ let mut builder = Builder::new(s.chars());
+ builder.build()
+}
+
+/// Decodes a json value from a string
+pub fn from_str(s: &str) -> Result<Json, BuilderError> {
+ let mut builder = Builder::new(s.chars());
+ builder.build()
+}
+
+/// A structure to decode JSON to values in rust.
+pub struct Decoder {
+ stack: Vec<Json>,
+}
+
+impl Decoder {
+ /// Creates a new decoder instance for decoding the specified JSON value.
+ pub fn new(json: Json) -> Decoder {
+ Decoder { stack: vec![json] }
+ }
+}
+
+impl Decoder {
+ fn pop(&mut self) -> Json {
+ self.stack.pop().unwrap()
+ }
+}
+
+macro_rules! expect {
+ ($e:expr, Null) => ({
+ match $e {
+ Json::Null => Ok(()),
+ other => Err(ExpectedError("Null".to_string(),
+ format!("{}", other)))
+ }
+ });
+ ($e:expr, $t:ident) => ({
+ match $e {
+ Json::$t(v) => Ok(v),
+ other => {
+ Err(ExpectedError(stringify!($t).to_string(),
+ format!("{}", other)))
+ }
+ }
+ })
+}
+
+macro_rules! read_primitive {
+ ($name:ident, $ty:ty) => {
+ fn $name(&mut self) -> DecodeResult<$ty> {
+ match self.pop() {
+ Json::I64(f) => match num::cast(f) {
+ Some(f) => Ok(f),
+ None => Err(ExpectedError("Number".to_string(), format!("{}", f))),
+ },
+ Json::U64(f) => match num::cast(f) {
+ Some(f) => Ok(f),
+ None => Err(ExpectedError("Number".to_string(), format!("{}", f))),
+ },
+ Json::F64(f) => Err(ExpectedError("Integer".to_string(), format!("{}", f))),
+ // re: #12967.. a type w/ numeric keys (ie HashMap<uint, V> etc)
+ // is going to have a string here, as per JSON spec.
+ Json::String(s) => match s.parse() {
+ Some(f) => Ok(f),
+ None => Err(ExpectedError("Number".to_string(), s)),
+ },
+ value => Err(ExpectedError("Number".to_string(), format!("{}", value))),
+ }
+ }
+ }
+}
+
+impl ::Decoder<DecoderError> for Decoder {
+ fn read_nil(&mut self) -> DecodeResult<()> {
+ expect!(self.pop(), Null)
+ }
+
+ read_primitive! { read_uint, uint }
+ read_primitive! { read_u8, u8 }
+ read_primitive! { read_u16, u16 }
+ read_primitive! { read_u32, u32 }
+ read_primitive! { read_u64, u64 }
+ read_primitive! { read_int, int }
+ read_primitive! { read_i8, i8 }
+ read_primitive! { read_i16, i16 }
+ read_primitive! { read_i32, i32 }
+ read_primitive! { read_i64, i64 }
+
+ fn read_f32(&mut self) -> DecodeResult<f32> { self.read_f64().map(|x| x as f32) }
+
+ fn read_f64(&mut self) -> DecodeResult<f64> {
+ match self.pop() {
+ Json::I64(f) => Ok(f as f64),
+ Json::U64(f) => Ok(f as f64),
+ Json::F64(f) => Ok(f),
+ Json::String(s) => {
+ // re: #12967.. a type w/ numeric keys (ie HashMap<uint, V> etc)
+ // is going to have a string here, as per JSON spec.
+ match s.parse() {
+ Some(f) => Ok(f),
+ None => Err(ExpectedError("Number".to_string(), s)),
+ }
+ },
+ Json::Null => Ok(f64::NAN),
+ value => Err(ExpectedError("Number".to_string(), format!("{}", value)))
+ }
+ }
+
+ fn read_bool(&mut self) -> DecodeResult<bool> {
+ expect!(self.pop(), Boolean)
+ }
+
+ fn read_char(&mut self) -> DecodeResult<char> {
+ let s = try!(self.read_str());
+ {
+ let mut it = s.chars();
+ match (it.next(), it.next()) {
+ // exactly one character
+ (Some(c), None) => return Ok(c),
+ _ => ()
+ }
+ }
+ Err(ExpectedError("single character string".to_string(), format!("{}", s)))
+ }
+
+ fn read_str(&mut self) -> DecodeResult<string::String> {
+ expect!(self.pop(), String)
+ }
+
+ fn read_enum<T, F>(&mut self, _name: &str, f: F) -> DecodeResult<T> where
+ F: FnOnce(&mut Decoder) -> DecodeResult<T>,
+ {
+ f(self)
+ }
+
+ fn read_enum_variant<T, F>(&mut self, names: &[&str],
+ mut f: F) -> DecodeResult<T>
+ where F: FnMut(&mut Decoder, uint) -> DecodeResult<T>,
+ {
+ let name = match self.pop() {
+ Json::String(s) => s,
+ Json::Object(mut o) => {
+ let n = match o.remove(&"variant".to_string()) {
+ Some(Json::String(s)) => s,
+ Some(val) => {
+ return Err(ExpectedError("String".to_string(), format!("{}", val)))
+ }
+ None => {
+ return Err(MissingFieldError("variant".to_string()))
+ }
+ };
+ match o.remove(&"fields".to_string()) {
+ Some(Json::Array(l)) => {
+ for field in l.into_iter().rev() {
+ self.stack.push(field);
+ }
+ },
+ Some(val) => {
+ return Err(ExpectedError("Array".to_string(), format!("{}", val)))
+ }
+ None => {
+ return Err(MissingFieldError("fields".to_string()))
+ }
+ }
+ n
+ }
+ json => {
+ return Err(ExpectedError("String or Object".to_string(), format!("{}", json)))
+ }
+ };
+ let idx = match names.iter().position(|n| *n == name[]) {
+ Some(idx) => idx,
+ None => return Err(UnknownVariantError(name))
+ };
+ f(self, idx)
+ }
+
+ fn read_enum_variant_arg<T, F>(&mut self, _idx: uint, f: F) -> DecodeResult<T> where
+ F: FnOnce(&mut Decoder) -> DecodeResult<T>,
+ {
+ f(self)
+ }
+
+ fn read_enum_struct_variant<T, F>(&mut self, names: &[&str], f: F) -> DecodeResult<T> where
+ F: FnMut(&mut Decoder, uint) -> DecodeResult<T>,
+ {
+ self.read_enum_variant(names, f)
+ }
+
+
+ fn read_enum_struct_variant_field<T, F>(&mut self,
+ _name: &str,
+ idx: uint,
+ f: F)
+ -> DecodeResult<T> where
+ F: FnOnce(&mut Decoder) -> DecodeResult<T>,
+ {
+ self.read_enum_variant_arg(idx, f)
+ }
+
+ fn read_struct<T, F>(&mut self, _name: &str, _len: uint, f: F) -> DecodeResult<T> where
+ F: FnOnce(&mut Decoder) -> DecodeResult<T>,
+ {
+ let value = try!(f(self));
+ self.pop();
+ Ok(value)
+ }
+
+ fn read_struct_field<T, F>(&mut self,
+ name: &str,
+ _idx: uint,
+ f: F)
+ -> DecodeResult<T> where
+ F: FnOnce(&mut Decoder) -> DecodeResult<T>,
+ {
+ let mut obj = try!(expect!(self.pop(), Object));
+
+ let value = match obj.remove(&name.to_string()) {
+ None => {
+ // Add a Null and try to parse it as an Option<_>
+ // to get None as a default value.
+ self.stack.push(Json::Null);
+ match f(self) {
+ Ok(x) => x,
+ Err(_) => return Err(MissingFieldError(name.to_string())),
+ }
+ },
+ Some(json) => {
+ self.stack.push(json);
+ try!(f(self))
+ }
+ };
+ self.stack.push(Json::Object(obj));
+ Ok(value)
+ }
+
+ fn read_tuple<T, F>(&mut self, tuple_len: uint, f: F) -> DecodeResult<T> where
+ F: FnOnce(&mut Decoder) -> DecodeResult<T>,
+ {
+ self.read_seq(move |d, len| {
+ if len == tuple_len {
+ f(d)
+ } else {
+ Err(ExpectedError(format!("Tuple{}", tuple_len), format!("Tuple{}", len)))
+ }
+ })
+ }
+
+ fn read_tuple_arg<T, F>(&mut self, idx: uint, f: F) -> DecodeResult<T> where
+ F: FnOnce(&mut Decoder) -> DecodeResult<T>,
+ {
+ self.read_seq_elt(idx, f)
+ }
+
+ fn read_tuple_struct<T, F>(&mut self,
+ _name: &str,
+ len: uint,
+ f: F)
+ -> DecodeResult<T> where
+ F: FnOnce(&mut Decoder) -> DecodeResult<T>,
+ {
+ self.read_tuple(len, f)
+ }
+
+ fn read_tuple_struct_arg<T, F>(&mut self,
+ idx: uint,
+ f: F)
+ -> DecodeResult<T> where
+ F: FnOnce(&mut Decoder) -> DecodeResult<T>,
+ {
+ self.read_tuple_arg(idx, f)
+ }
+
+ fn read_option<T, F>(&mut self, mut f: F) -> DecodeResult<T> where
+ F: FnMut(&mut Decoder, bool) -> DecodeResult<T>,
+ {
+ match self.pop() {
+ Json::Null => f(self, false),
+ value => { self.stack.push(value); f(self, true) }
+ }
+ }
+
+ fn read_seq<T, F>(&mut self, f: F) -> DecodeResult<T> where
+ F: FnOnce(&mut Decoder, uint) -> DecodeResult<T>,
+ {
+ let array = try!(expect!(self.pop(), Array));
+ let len = array.len();
+ for v in array.into_iter().rev() {
+ self.stack.push(v);
+ }
+ f(self, len)
+ }
+
+ fn read_seq_elt<T, F>(&mut self, _idx: uint, f: F) -> DecodeResult<T> where
+ F: FnOnce(&mut Decoder) -> DecodeResult<T>,
+ {
+ f(self)
+ }
+
+ fn read_map<T, F>(&mut self, f: F) -> DecodeResult<T> where
+ F: FnOnce(&mut Decoder, uint) -> DecodeResult<T>,
+ {
+ let obj = try!(expect!(self.pop(), Object));
+ let len = obj.len();
+ for (key, value) in obj.into_iter() {
+ self.stack.push(value);
+ self.stack.push(Json::String(key));
+ }
+ f(self, len)
+ }
+
+ fn read_map_elt_key<T, F>(&mut self, _idx: uint, f: F) -> DecodeResult<T> where
+ F: FnOnce(&mut Decoder) -> DecodeResult<T>,
+ {
+ f(self)
+ }
+
+ fn read_map_elt_val<T, F>(&mut self, _idx: uint, f: F) -> DecodeResult<T> where
+ F: FnOnce(&mut Decoder) -> DecodeResult<T>,
+ {
+ f(self)
+ }
+
+ fn error(&mut self, err: &str) -> DecoderError {
+ ApplicationError(err.to_string())
+ }
+}
+
+/// A trait for converting values to JSON
+pub trait ToJson for Sized? {
+ /// Converts the value of `self` to an instance of JSON
+ fn to_json(&self) -> Json;
+}
+
+macro_rules! to_json_impl_i64 {
+ ($($t:ty), +) => (
+ $(impl ToJson for $t {
+ fn to_json(&self) -> Json { Json::I64(*self as i64) }
+ })+
+ )
+}
+
+to_json_impl_i64! { int, i8, i16, i32, i64 }
+
+macro_rules! to_json_impl_u64 {
+ ($($t:ty), +) => (
+ $(impl ToJson for $t {
+ fn to_json(&self) -> Json { Json::U64(*self as u64) }
+ })+
+ )
+}
+
+to_json_impl_u64! { uint, u8, u16, u32, u64 }
+
+impl ToJson for Json {
+ fn to_json(&self) -> Json { self.clone() }
+}
+
+impl ToJson for f32 {
+ fn to_json(&self) -> Json { (*self as f64).to_json() }
+}
+
+impl ToJson for f64 {
+ fn to_json(&self) -> Json {
+ match self.classify() {
+ Fp::Nan | Fp::Infinite => Json::Null,
+ _ => Json::F64(*self)
+ }
+ }
+}
+
+impl ToJson for () {
+ fn to_json(&self) -> Json { Json::Null }
+}
+
+impl ToJson for bool {
+ fn to_json(&self) -> Json { Json::Boolean(*self) }
+}
+
+impl ToJson for str {
+ fn to_json(&self) -> Json { Json::String(self.to_string()) }
+}
+
+impl ToJson for string::String {
+ fn to_json(&self) -> Json { Json::String((*self).clone()) }
+}
+
+macro_rules! tuple_impl {
+ // use variables to indicate the arity of the tuple
+ ($($tyvar:ident),* ) => {
+ // the trailing commas are for the 1 tuple
+ impl<
+ $( $tyvar : ToJson ),*
+ > ToJson for ( $( $tyvar ),* , ) {
+
+ #[inline]
+ #[allow(non_snake_case)]
+ fn to_json(&self) -> Json {
+ match *self {
+ ($(ref $tyvar),*,) => Json::Array(vec![$($tyvar.to_json()),*])
+ }
+ }
+ }
+ }
+}
+
+tuple_impl!{A}
+tuple_impl!{A, B}
+tuple_impl!{A, B, C}
+tuple_impl!{A, B, C, D}
+tuple_impl!{A, B, C, D, E}
+tuple_impl!{A, B, C, D, E, F}
+tuple_impl!{A, B, C, D, E, F, G}
+tuple_impl!{A, B, C, D, E, F, G, H}
+tuple_impl!{A, B, C, D, E, F, G, H, I}
+tuple_impl!{A, B, C, D, E, F, G, H, I, J}
+tuple_impl!{A, B, C, D, E, F, G, H, I, J, K}
+tuple_impl!{A, B, C, D, E, F, G, H, I, J, K, L}
+
+impl<A: ToJson> ToJson for [A] {
+ fn to_json(&self) -> Json { Json::Array(self.iter().map(|elt| elt.to_json()).collect()) }
+}
+
+impl<A: ToJson> ToJson for Vec<A> {
+ fn to_json(&self) -> Json { Json::Array(self.iter().map(|elt| elt.to_json()).collect()) }
+}
+
+impl<A: ToJson> ToJson for BTreeMap<string::String, A> {
+ fn to_json(&self) -> Json {
+ let mut d = BTreeMap::new();
+ for (key, value) in self.iter() {
+ d.insert((*key).clone(), value.to_json());
+ }
+ Json::Object(d)
+ }
+}
+
+impl<A: ToJson> ToJson for HashMap<string::String, A> {
+ fn to_json(&self) -> Json {
+ let mut d = BTreeMap::new();
+ for (key, value) in self.iter() {
+ d.insert((*key).clone(), value.to_json());
+ }
+ Json::Object(d)
+ }
+}
+
+impl<A:ToJson> ToJson for Option<A> {
+ fn to_json(&self) -> Json {
+ match *self {
+ None => Json::Null,
+ Some(ref value) => value.to_json()
+ }
+ }
+}
+
+struct FormatShim<'a, 'b: 'a> {
+ inner: &'a mut fmt::Formatter<'b>,
+}
+
+impl<'a, 'b> fmt::Writer for FormatShim<'a, 'b> {
+ fn write_str(&mut self, s: &str) -> fmt::Result {
+ self.inner.write_str(s)
+ }
+}
+
+impl fmt::Show for Json {
+ /// Encodes a json value into a string
+ fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+ let mut shim = FormatShim { inner: f };
+ let mut encoder = Encoder::new(&mut shim);
+ self.encode(&mut encoder)
+ }
+}
+
+impl<'a> fmt::Show for PrettyJson<'a> {
+ /// Encodes a json value into a string
+ fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+ let mut shim = FormatShim { inner: f };
+ let mut encoder = PrettyEncoder::new(&mut shim);
+ self.inner.encode(&mut encoder)
+ }
+}
+
+impl<'a, T> fmt::Show for AsJson<'a, T>
+ where T: for<'b> Encodable<Encoder<'b>, fmt::Error>
+{
+ /// Encodes a json value into a string
+ fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+ let mut shim = FormatShim { inner: f };
+ let mut encoder = Encoder::new(&mut shim);
+ self.inner.encode(&mut encoder)
+ }
+}
+
+impl<'a, T> AsPrettyJson<'a, T> {
+ /// Set the indentation level for the emitted JSON
+ pub fn indent(mut self, indent: uint) -> AsPrettyJson<'a, T> {
+ self.indent = Some(indent);
+ self
+ }
+}
+
+impl<'a, T> fmt::Show for AsPrettyJson<'a, T>
+ where T: for<'b> Encodable<PrettyEncoder<'b>, fmt::Error>
+{
+ /// Encodes a json value into a string
+ fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+ let mut shim = FormatShim { inner: f };
+ let mut encoder = PrettyEncoder::new(&mut shim);
+ match self.indent {
+ Some(n) => encoder.set_indent(n),
+ None => {}
+ }
+ self.inner.encode(&mut encoder)
+ }
+}
+
+impl FromStr for Json {
+ fn from_str(s: &str) -> Option<Json> {
+ from_str(s).ok()
+ }
+}
+
+#[cfg(test)]
+mod tests {
+ extern crate test;
+ use self::Animal::*;
+ use self::DecodeEnum::*;
+ use self::test::Bencher;
+ use {Encodable, Decodable};
+ use super::Json::*;
+ use super::ErrorCode::*;
+ use super::ParserError::*;
+ use super::DecoderError::*;
+ use super::JsonEvent::*;
+ use super::StackElement::*;
+ use super::{Json, from_str, DecodeResult, DecoderError, JsonEvent, Parser,
+ StackElement, Stack, Decoder};
+ use std::{i64, u64, f32, f64};
+ use std::collections::BTreeMap;
+ use std::num::Float;
+ use std::string;
+
+ #[derive(RustcDecodable, Eq, PartialEq, Show)]
+ struct OptionData {
+ opt: Option<uint>,
+ }
+
+ #[test]
+ fn test_decode_option_none() {
+ let s ="{}";
+ let obj: OptionData = super::decode(s).unwrap();
+ assert_eq!(obj, OptionData { opt: None });
+ }
+
+ #[test]
+ fn test_decode_option_some() {
+ let s = "{ \"opt\": 10 }";
+ let obj: OptionData = super::decode(s).unwrap();
+ assert_eq!(obj, OptionData { opt: Some(10u) });
+ }
+
+ #[test]
+ fn test_decode_option_malformed() {
+ check_err::<OptionData>("{ \"opt\": [] }",
+ ExpectedError("Number".to_string(), "[]".to_string()));
+ check_err::<OptionData>("{ \"opt\": false }",
+ ExpectedError("Number".to_string(), "false".to_string()));
+ }
+
+ #[derive(PartialEq, RustcEncodable, RustcDecodable, Show)]
+ enum Animal {
+ Dog,
+ Frog(string::String, int)
+ }
+
+ #[derive(PartialEq, RustcEncodable, RustcDecodable, Show)]
+ struct Inner {
+ a: (),
+ b: uint,
+ c: Vec<string::String>,
+ }
+
+ #[derive(PartialEq, RustcEncodable, RustcDecodable, Show)]
+ struct Outer {
+ inner: Vec<Inner>,
+ }
+
+ fn mk_object(items: &[(string::String, Json)]) -> Json {
+ let mut d = BTreeMap::new();
+
+ for item in items.iter() {
+ match *item {
+ (ref key, ref value) => { d.insert((*key).clone(), (*value).clone()); },
+ }
+ };
+
+ Object(d)
+ }
+
+ #[test]
+ fn test_from_str_trait() {
+ let s = "null";
+ assert!(s.parse::<Json>().unwrap() == s.parse().unwrap());
+ }
+
+ #[test]
+ fn test_write_null() {
+ assert_eq!(Null.to_string(), "null");
+ assert_eq!(Null.pretty().to_string(), "null");
+ }
+
+ #[test]
+ fn test_write_i64() {
+ assert_eq!(U64(0).to_string(), "0");
+ assert_eq!(U64(0).pretty().to_string(), "0");
+
+ assert_eq!(U64(1234).to_string(), "1234");
+ assert_eq!(U64(1234).pretty().to_string(), "1234");
+
+ assert_eq!(I64(-5678).to_string(), "-5678");
+ assert_eq!(I64(-5678).pretty().to_string(), "-5678");
+
+ assert_eq!(U64(7650007200025252000).to_string(), "7650007200025252000");
+ assert_eq!(U64(7650007200025252000).pretty().to_string(), "7650007200025252000");
+ }
+
+ #[test]
+ fn test_write_f64() {
+ assert_eq!(F64(3.0).to_string(), "3.0");
+ assert_eq!(F64(3.0).pretty().to_string(), "3.0");
+
+ assert_eq!(F64(3.1).to_string(), "3.1");
+ assert_eq!(F64(3.1).pretty().to_string(), "3.1");
+
+ assert_eq!(F64(-1.5).to_string(), "-1.5");
+ assert_eq!(F64(-1.5).pretty().to_string(), "-1.5");
+
+ assert_eq!(F64(0.5).to_string(), "0.5");
+ assert_eq!(F64(0.5).pretty().to_string(), "0.5");
+
+ assert_eq!(F64(f64::NAN).to_string(), "null");
+ assert_eq!(F64(f64::NAN).pretty().to_string(), "null");
+
+ assert_eq!(F64(f64::INFINITY).to_string(), "null");
+ assert_eq!(F64(f64::INFINITY).pretty().to_string(), "null");
+
+ assert_eq!(F64(f64::NEG_INFINITY).to_string(), "null");
+ assert_eq!(F64(f64::NEG_INFINITY).pretty().to_string(), "null");
+ }
+
+ #[test]
+ fn test_write_str() {
+ assert_eq!(String("".to_string()).to_string(), "\"\"");
+ assert_eq!(String("".to_string()).pretty().to_string(), "\"\"");
+
+ assert_eq!(String("homura".to_string()).to_string(), "\"homura\"");
+ assert_eq!(String("madoka".to_string()).pretty().to_string(), "\"madoka\"");
+ }
+
+ #[test]
+ fn test_write_bool() {
+ assert_eq!(Boolean(true).to_string(), "true");
+ assert_eq!(Boolean(true).pretty().to_string(), "true");
+
+ assert_eq!(Boolean(false).to_string(), "false");
+ assert_eq!(Boolean(false).pretty().to_string(), "false");
+ }
+
+ #[test]
+ fn test_write_array() {
+ assert_eq!(Array(vec![]).to_string(), "[]");
+ assert_eq!(Array(vec![]).pretty().to_string(), "[]");
+
+ assert_eq!(Array(vec![Boolean(true)]).to_string(), "[true]");
+ assert_eq!(
+ Array(vec![Boolean(true)]).pretty().to_string(),
+ "\
+ [\n \
+ true\n\
+ ]"
+ );
+
+ let long_test_array = Array(vec![
+ Boolean(false),
+ Null,
+ Array(vec![String("foo\nbar".to_string()), F64(3.5)])]);
+
+ assert_eq!(long_test_array.to_string(),
+ "[false,null,[\"foo\\nbar\",3.5]]");
+ assert_eq!(
+ long_test_array.pretty().to_string(),
+ "\
+ [\n \
+ false,\n \
+ null,\n \
+ [\n \
+ \"foo\\nbar\",\n \
+ 3.5\n \
+ ]\n\
+ ]"
+ );
+ }
+
+ #[test]
+ fn test_write_object() {
+ assert_eq!(mk_object(&[]).to_string(), "{}");
+ assert_eq!(mk_object(&[]).pretty().to_string(), "{}");
+
+ assert_eq!(
+ mk_object(&[
+ ("a".to_string(), Boolean(true))
+ ]).to_string(),
+ "{\"a\":true}"
+ );
+ assert_eq!(
+ mk_object(&[("a".to_string(), Boolean(true))]).pretty().to_string(),
+ "\
+ {\n \
+ \"a\": true\n\
+ }"
+ );
+
+ let complex_obj = mk_object(&[
+ ("b".to_string(), Array(vec![
+ mk_object(&[("c".to_string(), String("\x0c\r".to_string()))]),
+ mk_object(&[("d".to_string(), String("".to_string()))])
+ ]))
+ ]);
+
+ assert_eq!(
+ complex_obj.to_string(),
+ "{\
+ \"b\":[\
+ {\"c\":\"\\f\\r\"},\
+ {\"d\":\"\"}\
+ ]\
+ }"
+ );
+ assert_eq!(
+ complex_obj.pretty().to_string(),
+ "\
+ {\n \
+ \"b\": [\n \
+ {\n \
+ \"c\": \"\\f\\r\"\n \
+ },\n \
+ {\n \
+ \"d\": \"\"\n \
+ }\n \
+ ]\n\
+ }"
+ );
+
+ let a = mk_object(&[
+ ("a".to_string(), Boolean(true)),
+ ("b".to_string(), Array(vec![
+ mk_object(&[("c".to_string(), String("\x0c\r".to_string()))]),
+ mk_object(&[("d".to_string(), String("".to_string()))])
+ ]))
+ ]);
+
+ // We can't compare the strings directly because the object fields be
+ // printed in a different order.
+ assert_eq!(a.clone(), a.to_string().parse().unwrap());
+ assert_eq!(a.clone(), a.pretty().to_string().parse().unwrap());
+ }
+
+ #[test]
+ fn test_write_enum() {
+ let animal = Dog;
+ assert_eq!(
+ format!("{}", super::as_json(&animal)),
+ "\"Dog\""
+ );
+ assert_eq!(
+ format!("{}", super::as_pretty_json(&animal)),
+ "\"Dog\""
+ );
+
+ let animal = Frog("Henry".to_string(), 349);
+ assert_eq!(
+ format!("{}", super::as_json(&animal)),
+ "{\"variant\":\"Frog\",\"fields\":[\"Henry\",349]}"
+ );
+ assert_eq!(
+ format!("{}", super::as_pretty_json(&animal)),
+ "{\n \
+ \"variant\": \"Frog\",\n \
+ \"fields\": [\n \
+ \"Henry\",\n \
+ 349\n \
+ ]\n\
+ }"
+ );
+ }
+
+ macro_rules! check_encoder_for_simple {
+ ($value:expr, $expected:expr) => ({
+ let s = format!("{}", super::as_json(&$value));
+ assert_eq!(s, $expected);
+
+ let s = format!("{}", super::as_pretty_json(&$value));
+ assert_eq!(s, $expected);
+ })
+ }
+
+ #[test]
+ fn test_write_some() {
+ check_encoder_for_simple!(Some("jodhpurs".to_string()), "\"jodhpurs\"");
+ }
+
+ #[test]
+ fn test_write_none() {
+ check_encoder_for_simple!(None::<string::String>, "null");
+ }
+
+ #[test]
+ fn test_write_char() {
+ check_encoder_for_simple!('a', "\"a\"");
+ check_encoder_for_simple!('\t', "\"\\t\"");
+ check_encoder_for_simple!('\u{0000}', "\"\\u0000\"");
+ check_encoder_for_simple!('\u{001b}', "\"\\u001b\"");
+ check_encoder_for_simple!('\u{007f}', "\"\\u007f\"");
+ check_encoder_for_simple!('\u{00a0}', "\"\u{00a0}\"");
+ check_encoder_for_simple!('\u{abcd}', "\"\u{abcd}\"");
+ check_encoder_for_simple!('\u{10ffff}', "\"\u{10ffff}\"");
+ }
+
+ #[test]
+ fn test_trailing_characters() {
+ assert_eq!(from_str("nulla"), Err(SyntaxError(TrailingCharacters, 1, 5)));
+ assert_eq!(from_str("truea"), Err(SyntaxError(TrailingCharacters, 1, 5)));
+ assert_eq!(from_str("falsea"), Err(SyntaxError(TrailingCharacters, 1, 6)));
+ assert_eq!(from_str("1a"), Err(SyntaxError(TrailingCharacters, 1, 2)));
+ assert_eq!(from_str("[]a"), Err(SyntaxError(TrailingCharacters, 1, 3)));
+ assert_eq!(from_str("{}a"), Err(SyntaxError(TrailingCharacters, 1, 3)));
+ }
+
+ #[test]
+ fn test_read_identifiers() {
+ assert_eq!(from_str("n"), Err(SyntaxError(InvalidSyntax, 1, 2)));
+ assert_eq!(from_str("nul"), Err(SyntaxError(InvalidSyntax, 1, 4)));
+ assert_eq!(from_str("t"), Err(SyntaxError(InvalidSyntax, 1, 2)));
+ assert_eq!(from_str("truz"), Err(SyntaxError(InvalidSyntax, 1, 4)));
+ assert_eq!(from_str("f"), Err(SyntaxError(InvalidSyntax, 1, 2)));
+ assert_eq!(from_str("faz"), Err(SyntaxError(InvalidSyntax, 1, 3)));
+
+ assert_eq!(from_str("null"), Ok(Null));
+ assert_eq!(from_str("true"), Ok(Boolean(true)));
+ assert_eq!(from_str("false"), Ok(Boolean(false)));
+ assert_eq!(from_str(" null "), Ok(Null));
+ assert_eq!(from_str(" true "), Ok(Boolean(true)));
+ assert_eq!(from_str(" false "), Ok(Boolean(false)));
+ }
+
+ #[test]
+ fn test_decode_identifiers() {
+ let v: () = super::decode("null").unwrap();
+ assert_eq!(v, ());
+
+ let v: bool = super::decode("true").unwrap();
+ assert_eq!(v, true);
+
+ let v: bool = super::decode("false").unwrap();
+ assert_eq!(v, false);
+ }
+
+ #[test]
+ fn test_read_number() {
+ assert_eq!(from_str("+"), Err(SyntaxError(InvalidSyntax, 1, 1)));
+ assert_eq!(from_str("."), Err(SyntaxError(InvalidSyntax, 1, 1)));
+ assert_eq!(from_str("NaN"), Err(SyntaxError(InvalidSyntax, 1, 1)));
+ assert_eq!(from_str("-"), Err(SyntaxError(InvalidNumber, 1, 2)));
+ assert_eq!(from_str("00"), Err(SyntaxError(InvalidNumber, 1, 2)));
+ assert_eq!(from_str("1."), Err(SyntaxError(InvalidNumber, 1, 3)));
+ assert_eq!(from_str("1e"), Err(SyntaxError(InvalidNumber, 1, 3)));
+ assert_eq!(from_str("1e+"), Err(SyntaxError(InvalidNumber, 1, 4)));
+
+ assert_eq!(from_str("18446744073709551616"), Err(SyntaxError(InvalidNumber, 1, 20)));
+ assert_eq!(from_str("-9223372036854775809"), Err(SyntaxError(InvalidNumber, 1, 21)));
+
+ assert_eq!(from_str("3"), Ok(U64(3)));
+ assert_eq!(from_str("3.1"), Ok(F64(3.1)));
+ assert_eq!(from_str("-1.2"), Ok(F64(-1.2)));
+ assert_eq!(from_str("0.4"), Ok(F64(0.4)));
+ assert_eq!(from_str("0.4e5"), Ok(F64(0.4e5)));
+ assert_eq!(from_str("0.4e+15"), Ok(F64(0.4e15)));
+ assert_eq!(from_str("0.4e-01"), Ok(F64(0.4e-01)));
+ assert_eq!(from_str(" 3 "), Ok(U64(3)));
+
+ assert_eq!(from_str("-9223372036854775808"), Ok(I64(i64::MIN)));
+ assert_eq!(from_str("9223372036854775807"), Ok(U64(i64::MAX as u64)));
+ assert_eq!(from_str("18446744073709551615"), Ok(U64(u64::MAX)));
+ }
+
+ #[test]
+ fn test_decode_numbers() {
+ let v: f64 = super::decode("3").unwrap();
+ assert_eq!(v, 3.0);
+
+ let v: f64 = super::decode("3.1").unwrap();
+ assert_eq!(v, 3.1);
+
+ let v: f64 = super::decode("-1.2").unwrap();
+ assert_eq!(v, -1.2);
+
+ let v: f64 = super::decode("0.4").unwrap();
+ assert_eq!(v, 0.4);
+
+ let v: f64 = super::decode("0.4e5").unwrap();
+ assert_eq!(v, 0.4e5);
+
+ let v: f64 = super::decode("0.4e15").unwrap();
+ assert_eq!(v, 0.4e15);
+
+ let v: f64 = super::decode("0.4e-01").unwrap();
+ assert_eq!(v, 0.4e-01);
+
+ let v: u64 = super::decode("0").unwrap();
+ assert_eq!(v, 0);
+
+ let v: u64 = super::decode("18446744073709551615").unwrap();
+ assert_eq!(v, u64::MAX);
+
+ let v: i64 = super::decode("-9223372036854775808").unwrap();
+ assert_eq!(v, i64::MIN);
+
+ let v: i64 = super::decode("9223372036854775807").unwrap();
+ assert_eq!(v, i64::MAX);
+
+ let res: DecodeResult<i64> = super::decode("765.25252");
+ assert_eq!(res, Err(ExpectedError("Integer".to_string(), "765.25252".to_string())));
+ }
+
+ #[test]
+ fn test_read_str() {
+ assert_eq!(from_str("\""), Err(SyntaxError(EOFWhileParsingString, 1, 2)));
+ assert_eq!(from_str("\"lol"), Err(SyntaxError(EOFWhileParsingString, 1, 5)));
+
+ assert_eq!(from_str("\"\""), Ok(String("".to_string())));
+ assert_eq!(from_str("\"foo\""), Ok(String("foo".to_string())));
+ assert_eq!(from_str("\"\\\"\""), Ok(String("\"".to_string())));
+ assert_eq!(from_str("\"\\b\""), Ok(String("\x08".to_string())));
+ assert_eq!(from_str("\"\\n\""), Ok(String("\n".to_string())));
+ assert_eq!(from_str("\"\\r\""), Ok(String("\r".to_string())));
+ assert_eq!(from_str("\"\\t\""), Ok(String("\t".to_string())));
+ assert_eq!(from_str(" \"foo\" "), Ok(String("foo".to_string())));
+ assert_eq!(from_str("\"\\u12ab\""), Ok(String("\u{12ab}".to_string())));
+ assert_eq!(from_str("\"\\uAB12\""), Ok(String("\u{AB12}".to_string())));
+ }
+
+ #[test]
+ fn test_decode_str() {
+ let s = [("\"\"", ""),
+ ("\"foo\"", "foo"),
+ ("\"\\\"\"", "\""),
+ ("\"\\b\"", "\x08"),
+ ("\"\\n\"", "\n"),
+ ("\"\\r\"", "\r"),
+ ("\"\\t\"", "\t"),
+ ("\"\\u12ab\"", "\u{12ab}"),
+ ("\"\\uAB12\"", "\u{AB12}")];
+
+ for &(i, o) in s.iter() {
+ let v: string::String = super::decode(i).unwrap();
+ assert_eq!(v, o);
+ }
+ }
+
+ #[test]
+ fn test_read_array() {
+ assert_eq!(from_str("["), Err(SyntaxError(EOFWhileParsingValue, 1, 2)));
+ assert_eq!(from_str("[1"), Err(SyntaxError(EOFWhileParsingArray, 1, 3)));
+ assert_eq!(from_str("[1,"), Err(SyntaxError(EOFWhileParsingValue, 1, 4)));
+ assert_eq!(from_str("[1,]"), Err(SyntaxError(InvalidSyntax, 1, 4)));
+ assert_eq!(from_str("[6 7]"), Err(SyntaxError(InvalidSyntax, 1, 4)));
+
+ assert_eq!(from_str("[]"), Ok(Array(vec![])));
+ assert_eq!(from_str("[ ]"), Ok(Array(vec![])));
+ assert_eq!(from_str("[true]"), Ok(Array(vec![Boolean(true)])));
+ assert_eq!(from_str("[ false ]"), Ok(Array(vec![Boolean(false)])));
+ assert_eq!(from_str("[null]"), Ok(Array(vec![Null])));
+ assert_eq!(from_str("[3, 1]"),
+ Ok(Array(vec![U64(3), U64(1)])));
+ assert_eq!(from_str("\n[3, 2]\n"),
+ Ok(Array(vec![U64(3), U64(2)])));
+ assert_eq!(from_str("[2, [4, 1]]"),
+ Ok(Array(vec![U64(2), Array(vec![U64(4), U64(1)])])));
+ }
+
+ #[test]
+ fn test_decode_array() {
+ let v: Vec<()> = super::decode("[]").unwrap();
+ assert_eq!(v, vec![]);
+
+ let v: Vec<()> = super::decode("[null]").unwrap();
+ assert_eq!(v, vec![()]);
+
+ let v: Vec<bool> = super::decode("[true]").unwrap();
+ assert_eq!(v, vec![true]);
+
+ let v: Vec<int> = super::decode("[3, 1]").unwrap();
+ assert_eq!(v, vec![3, 1]);
+
+ let v: Vec<Vec<uint>> = super::decode("[[3], [1, 2]]").unwrap();
+ assert_eq!(v, vec![vec![3], vec![1, 2]]);
+ }
+
+ #[test]
+ fn test_decode_tuple() {
+ let t: (uint, uint, uint) = super::decode("[1, 2, 3]").unwrap();
+ assert_eq!(t, (1u, 2, 3));
+
+ let t: (uint, string::String) = super::decode("[1, \"two\"]").unwrap();
+ assert_eq!(t, (1u, "two".to_string()));
+ }
+
+ #[test]
+ fn test_decode_tuple_malformed_types() {
+ assert!(super::decode::<(uint, string::String)>("[1, 2]").is_err());
+ }
+
+ #[test]
+ fn test_decode_tuple_malformed_length() {
+ assert!(super::decode::<(uint, uint)>("[1, 2, 3]").is_err());
+ }
+
+ #[test]
+ fn test_read_object() {
+ assert_eq!(from_str("{"), Err(SyntaxError(EOFWhileParsingObject, 1, 2)));
+ assert_eq!(from_str("{ "), Err(SyntaxError(EOFWhileParsingObject, 1, 3)));
+ assert_eq!(from_str("{1"), Err(SyntaxError(KeyMustBeAString, 1, 2)));
+ assert_eq!(from_str("{ \"a\""), Err(SyntaxError(EOFWhileParsingObject, 1, 6)));
+ assert_eq!(from_str("{\"a\""), Err(SyntaxError(EOFWhileParsingObject, 1, 5)));
+ assert_eq!(from_str("{\"a\" "), Err(SyntaxError(EOFWhileParsingObject, 1, 6)));
+
+ assert_eq!(from_str("{\"a\" 1"), Err(SyntaxError(ExpectedColon, 1, 6)));
+ assert_eq!(from_str("{\"a\":"), Err(SyntaxError(EOFWhileParsingValue, 1, 6)));
+ assert_eq!(from_str("{\"a\":1"), Err(SyntaxError(EOFWhileParsingObject, 1, 7)));
+ assert_eq!(from_str("{\"a\":1 1"), Err(SyntaxError(InvalidSyntax, 1, 8)));
+ assert_eq!(from_str("{\"a\":1,"), Err(SyntaxError(EOFWhileParsingObject, 1, 8)));
+
+ assert_eq!(from_str("{}").unwrap(), mk_object(&[]));
+ assert_eq!(from_str("{\"a\": 3}").unwrap(),
+ mk_object(&[("a".to_string(), U64(3))]));
+
+ assert_eq!(from_str(
+ "{ \"a\": null, \"b\" : true }").unwrap(),
+ mk_object(&[
+ ("a".to_string(), Null),
+ ("b".to_string(), Boolean(true))]));
+ assert_eq!(from_str("\n{ \"a\": null, \"b\" : true }\n").unwrap(),
+ mk_object(&[
+ ("a".to_string(), Null),
+ ("b".to_string(), Boolean(true))]));
+ assert_eq!(from_str(
+ "{\"a\" : 1.0 ,\"b\": [ true ]}").unwrap(),
+ mk_object(&[
+ ("a".to_string(), F64(1.0)),
+ ("b".to_string(), Array(vec![Boolean(true)]))
+ ]));
+ assert_eq!(from_str(
+ "{\
+ \"a\": 1.0, \
+ \"b\": [\
+ true,\
+ \"foo\\nbar\", \
+ { \"c\": {\"d\": null} } \
+ ]\
+ }").unwrap(),
+ mk_object(&[
+ ("a".to_string(), F64(1.0)),
+ ("b".to_string(), Array(vec![
+ Boolean(true),
+ String("foo\nbar".to_string()),
+ mk_object(&[
+ ("c".to_string(), mk_object(&[("d".to_string(), Null)]))
+ ])
+ ]))
+ ]));
+ }
+
+ #[test]
+ fn test_decode_struct() {
+ let s = "{
+ \"inner\": [
+ { \"a\": null, \"b\": 2, \"c\": [\"abc\", \"xyz\"] }
+ ]
+ }";
+
+ let v: Outer = super::decode(s).unwrap();
+ assert_eq!(
+ v,
+ Outer {
+ inner: vec![
+ Inner { a: (), b: 2, c: vec!["abc".to_string(), "xyz".to_string()] }
+ ]
+ }
+ );
+ }
+
+ #[derive(RustcDecodable)]
+ struct FloatStruct {
+ f: f64,
+ a: Vec<f64>
+ }
+ #[test]
+ fn test_decode_struct_with_nan() {
+ let s = "{\"f\":null,\"a\":[null,123]}";
+ let obj: FloatStruct = super::decode(s).unwrap();
+ assert!(obj.f.is_nan());
+ assert!(obj.a[0].is_nan());
+ assert_eq!(obj.a[1], 123f64);
+ }
+
+ #[test]
+ fn test_decode_option() {
+ let value: Option<string::String> = super::decode("null").unwrap();
+ assert_eq!(value, None);
+
+ let value: Option<string::String> = super::decode("\"jodhpurs\"").unwrap();
+ assert_eq!(value, Some("jodhpurs".to_string()));
+ }
+
+ #[test]
+ fn test_decode_enum() {
+ let value: Animal = super::decode("\"Dog\"").unwrap();
+ assert_eq!(value, Dog);
+
+ let s = "{\"variant\":\"Frog\",\"fields\":[\"Henry\",349]}";
+ let value: Animal = super::decode(s).unwrap();
+ assert_eq!(value, Frog("Henry".to_string(), 349));
+ }
+
+ #[test]
+ fn test_decode_map() {
+ let s = "{\"a\": \"Dog\", \"b\": {\"variant\":\"Frog\",\
+ \"fields\":[\"Henry\", 349]}}";
+ let mut map: BTreeMap<string::String, Animal> = super::decode(s).unwrap();
+
+ assert_eq!(map.remove(&"a".to_string()), Some(Dog));
+ assert_eq!(map.remove(&"b".to_string()), Some(Frog("Henry".to_string(), 349)));
+ }
+
+ #[test]
+ fn test_multiline_errors() {
+ assert_eq!(from_str("{\n \"foo\":\n \"bar\""),
+ Err(SyntaxError(EOFWhileParsingObject, 3u, 8u)));
+ }
+
+ #[derive(RustcDecodable)]
+ #[allow(dead_code)]
+ struct DecodeStruct {
+ x: f64,
+ y: bool,
+ z: string::String,
+ w: Vec<DecodeStruct>
+ }
+ #[derive(RustcDecodable)]
+ enum DecodeEnum {
+ A(f64),
+ B(string::String)
+ }
+ fn check_err<T: Decodable<Decoder, DecoderError>>(to_parse: &'static str,
+ expected: DecoderError) {
+ let res: DecodeResult<T> = match from_str(to_parse) {
+ Err(e) => Err(ParseError(e)),
+ Ok(json) => Decodable::decode(&mut Decoder::new(json))
+ };
+ match res {
+ Ok(_) => panic!("`{}` parsed & decoded ok, expecting error `{}`",
+ to_parse, expected),
+ Err(ParseError(e)) => panic!("`{}` is not valid json: {}",
+ to_parse, e),
+ Err(e) => {
+ assert_eq!(e, expected);
+ }
+ }
+ }
+ #[test]
+ fn test_decode_errors_struct() {
+ check_err::<DecodeStruct>("[]", ExpectedError("Object".to_string(), "[]".to_string()));
+ check_err::<DecodeStruct>("{\"x\": true, \"y\": true, \"z\": \"\", \"w\": []}",
+ ExpectedError("Number".to_string(), "true".to_string()));
+ check_err::<DecodeStruct>("{\"x\": 1, \"y\": [], \"z\": \"\", \"w\": []}",
+ ExpectedError("Boolean".to_string(), "[]".to_string()));
+ check_err::<DecodeStruct>("{\"x\": 1, \"y\": true, \"z\": {}, \"w\": []}",
+ ExpectedError("String".to_string(), "{}".to_string()));
+ check_err::<DecodeStruct>("{\"x\": 1, \"y\": true, \"z\": \"\", \"w\": null}",
+ ExpectedError("Array".to_string(), "null".to_string()));
+ check_err::<DecodeStruct>("{\"x\": 1, \"y\": true, \"z\": \"\"}",
+ MissingFieldError("w".to_string()));
+ }
+ #[test]
+ fn test_decode_errors_enum() {
+ check_err::<DecodeEnum>("{}",
+ MissingFieldError("variant".to_string()));
+ check_err::<DecodeEnum>("{\"variant\": 1}",
+ ExpectedError("String".to_string(), "1".to_string()));
+ check_err::<DecodeEnum>("{\"variant\": \"A\"}",
+ MissingFieldError("fields".to_string()));
+ check_err::<DecodeEnum>("{\"variant\": \"A\", \"fields\": null}",
+ ExpectedError("Array".to_string(), "null".to_string()));
+ check_err::<DecodeEnum>("{\"variant\": \"C\", \"fields\": []}",
+ UnknownVariantError("C".to_string()));
+ }
+
+ #[test]
+ fn test_find(){
+ let json_value = from_str("{\"dog\" : \"cat\"}").unwrap();
+ let found_str = json_value.find("dog");
+ assert!(found_str.unwrap().as_string().unwrap() == "cat");
+ }
+
+ #[test]
+ fn test_find_path(){
+ let json_value = from_str("{\"dog\":{\"cat\": {\"mouse\" : \"cheese\"}}}").unwrap();
+ let found_str = json_value.find_path(&["dog", "cat", "mouse"]);
+ assert!(found_str.unwrap().as_string().unwrap() == "cheese");
+ }
+
+ #[test]
+ fn test_search(){
+ let json_value = from_str("{\"dog\":{\"cat\": {\"mouse\" : \"cheese\"}}}").unwrap();
+ let found_str = json_value.search("mouse").and_then(|j| j.as_string());
+ assert!(found_str.unwrap() == "cheese");
+ }
+
+ #[test]
+ fn test_index(){
+ let json_value = from_str("{\"animals\":[\"dog\",\"cat\",\"mouse\"]}").unwrap();
+ let ref array = json_value["animals"];
+ assert_eq!(array[0].as_string().unwrap(), "dog");
+ assert_eq!(array[1].as_string().unwrap(), "cat");
+ assert_eq!(array[2].as_string().unwrap(), "mouse");
+ }
+
+ #[test]
+ fn test_is_object(){
+ let json_value = from_str("{}").unwrap();
+ assert!(json_value.is_object());
+ }
+
+ #[test]
+ fn test_as_object(){
+ let json_value = from_str("{}").unwrap();
+ let json_object = json_value.as_object();
+ assert!(json_object.is_some());
+ }
+
+ #[test]
+ fn test_is_array(){
+ let json_value = from_str("[1, 2, 3]").unwrap();
+ assert!(json_value.is_array());
+ }
+
+ #[test]
+ fn test_as_array(){
+ let json_value = from_str("[1, 2, 3]").unwrap();
+ let json_array = json_value.as_array();
+ let expected_length = 3;
+ assert!(json_array.is_some() && json_array.unwrap().len() == expected_length);
+ }
+
+ #[test]
+ fn test_is_string(){
+ let json_value = from_str("\"dog\"").unwrap();
+ assert!(json_value.is_string());
+ }
+
+ #[test]
+ fn test_as_string(){
+ let json_value = from_str("\"dog\"").unwrap();
+ let json_str = json_value.as_string();
+ let expected_str = "dog";
+ assert_eq!(json_str, Some(expected_str));
+ }
+
+ #[test]
+ fn test_is_number(){
+ let json_value = from_str("12").unwrap();
+ assert!(json_value.is_number());
+ }
+
+ #[test]
+ fn test_is_i64(){
+ let json_value = from_str("-12").unwrap();
+ assert!(json_value.is_i64());
+
+ let json_value = from_str("12").unwrap();
+ assert!(!json_value.is_i64());
+
+ let json_value = from_str("12.0").unwrap();
+ assert!(!json_value.is_i64());
+ }
+
+ #[test]
+ fn test_is_u64(){
+ let json_value = from_str("12").unwrap();
+ assert!(json_value.is_u64());
+
+ let json_value = from_str("-12").unwrap();
+ assert!(!json_value.is_u64());
+
+ let json_value = from_str("12.0").unwrap();
+ assert!(!json_value.is_u64());
+ }
+
+ #[test]
+ fn test_is_f64(){
+ let json_value = from_str("12").unwrap();
+ assert!(!json_value.is_f64());
+
+ let json_value = from_str("-12").unwrap();
+ assert!(!json_value.is_f64());
+
+ let json_value = from_str("12.0").unwrap();
+ assert!(json_value.is_f64());
+
+ let json_value = from_str("-12.0").unwrap();
+ assert!(json_value.is_f64());
+ }
+
+ #[test]
+ fn test_as_i64(){
+ let json_value = from_str("-12").unwrap();
+ let json_num = json_value.as_i64();
+ assert_eq!(json_num, Some(-12));
+ }
+
+ #[test]
+ fn test_as_u64(){
+ let json_value = from_str("12").unwrap();
+ let json_num = json_value.as_u64();
+ assert_eq!(json_num, Some(12));
+ }
+
+ #[test]
+ fn test_as_f64(){
+ let json_value = from_str("12.0").unwrap();
+ let json_num = json_value.as_f64();
+ assert_eq!(json_num, Some(12f64));
+ }
+
+ #[test]
+ fn test_is_boolean(){
+ let json_value = from_str("false").unwrap();
+ assert!(json_value.is_boolean());
+ }
+
+ #[test]
+ fn test_as_boolean(){
+ let json_value = from_str("false").unwrap();
+ let json_bool = json_value.as_boolean();
+ let expected_bool = false;
+ assert!(json_bool.is_some() && json_bool.unwrap() == expected_bool);
+ }
+
+ #[test]
+ fn test_is_null(){
+ let json_value = from_str("null").unwrap();
+ assert!(json_value.is_null());
+ }
+
+ #[test]
+ fn test_as_null(){
+ let json_value = from_str("null").unwrap();
+ let json_null = json_value.as_null();
+ let expected_null = ();
+ assert!(json_null.is_some() && json_null.unwrap() == expected_null);
+ }
+
+ #[test]
+ fn test_encode_hashmap_with_numeric_key() {
+ use std::str::from_utf8;
+ use std::io::Writer;
+ use std::collections::HashMap;
+ let mut hm: HashMap<uint, bool> = HashMap::new();
+ hm.insert(1, true);
+ let mut mem_buf = Vec::new();
+ write!(&mut mem_buf, "{}", super::as_pretty_json(&hm)).unwrap();
+ let json_str = from_utf8(mem_buf[]).unwrap();
+ match from_str(json_str) {
+ Err(_) => panic!("Unable to parse json_str: {}", json_str),
+ _ => {} // it parsed and we are good to go
+ }
+ }
+
+ #[test]
+ fn test_prettyencode_hashmap_with_numeric_key() {
+ use std::str::from_utf8;
+ use std::io::Writer;
+ use std::collections::HashMap;
+ let mut hm: HashMap<uint, bool> = HashMap::new();
+ hm.insert(1, true);
+ let mut mem_buf = Vec::new();
+ write!(&mut mem_buf, "{}", super::as_pretty_json(&hm)).unwrap();
+ let json_str = from_utf8(mem_buf[]).unwrap();
+ match from_str(json_str) {
+ Err(_) => panic!("Unable to parse json_str: {}", json_str),
+ _ => {} // it parsed and we are good to go
+ }
+ }
+
+ #[test]
+ fn test_prettyencoder_indent_level_param() {
+ use std::str::from_utf8;
+ use std::collections::BTreeMap;
+
+ let mut tree = BTreeMap::new();
+
+ tree.insert("hello".to_string(), String("guten tag".to_string()));
+ tree.insert("goodbye".to_string(), String("sayonara".to_string()));
+
+ let json = Array(
+ // The following layout below should look a lot like
+ // the pretty-printed JSON (indent * x)
+ vec!
+ ( // 0x
+ String("greetings".to_string()), // 1x
+ Object(tree), // 1x + 2x + 2x + 1x
+ ) // 0x
+ // End JSON array (7 lines)
+ );
+
+ // Helper function for counting indents
+ fn indents(source: &str) -> uint {
+ let trimmed = source.trim_left_matches(' ');
+ source.len() - trimmed.len()
+ }
+
+ // Test up to 4 spaces of indents (more?)
+ for i in range(0, 4u) {
+ let mut writer = Vec::new();
+ write!(&mut writer, "{}",
+ super::as_pretty_json(&json).indent(i)).unwrap();
+
+ let printed = from_utf8(writer[]).unwrap();
+
+ // Check for indents at each line
+ let lines: Vec<&str> = printed.lines().collect();
+ assert_eq!(lines.len(), 7); // JSON should be 7 lines
+
+ assert_eq!(indents(lines[0]), 0 * i); // [
+ assert_eq!(indents(lines[1]), 1 * i); // "greetings",
+ assert_eq!(indents(lines[2]), 1 * i); // {
+ assert_eq!(indents(lines[3]), 2 * i); // "hello": "guten tag",
+ assert_eq!(indents(lines[4]), 2 * i); // "goodbye": "sayonara"
+ assert_eq!(indents(lines[5]), 1 * i); // },
+ assert_eq!(indents(lines[6]), 0 * i); // ]
+
+ // Finally, test that the pretty-printed JSON is valid
+ from_str(printed).ok().expect("Pretty-printed JSON is invalid!");
+ }
+ }
+
+ #[test]
+ fn test_hashmap_with_numeric_key_can_handle_double_quote_delimited_key() {
+ use std::collections::HashMap;
+ use Decodable;
+ let json_str = "{\"1\":true}";
+ let json_obj = match from_str(json_str) {
+ Err(_) => panic!("Unable to parse json_str: {}", json_str),
+ Ok(o) => o
+ };
+ let mut decoder = Decoder::new(json_obj);
+ let _hm: HashMap<uint, bool> = Decodable::decode(&mut decoder).unwrap();
+ }
+
+ #[test]
+ fn test_hashmap_with_numeric_key_will_error_with_string_keys() {
+ use std::collections::HashMap;
+ use Decodable;
+ let json_str = "{\"a\":true}";
+ let json_obj = match from_str(json_str) {
+ Err(_) => panic!("Unable to parse json_str: {}", json_str),
+ Ok(o) => o
+ };
+ let mut decoder = Decoder::new(json_obj);
+ let result: Result<HashMap<uint, bool>, DecoderError> = Decodable::decode(&mut decoder);
+ assert_eq!(result, Err(ExpectedError("Number".to_string(), "a".to_string())));
+ }
+
+ fn assert_stream_equal(src: &str,
+ expected: Vec<(JsonEvent, Vec<StackElement>)>) {
+ let mut parser = Parser::new(src.chars());
+ let mut i = 0;
+ loop {
+ let evt = match parser.next() {
+ Some(e) => e,
+ None => { break; }
+ };
+ let (ref expected_evt, ref expected_stack) = expected[i];
+ if !parser.stack().is_equal_to(expected_stack.as_slice()) {
+ panic!("Parser stack is not equal to {}", expected_stack);
+ }
+ assert_eq!(&evt, expected_evt);
+ i+=1;
+ }
+ }
+ #[test]
+ #[cfg_attr(target_word_size = "32", ignore)] // FIXME(#14064)
+ fn test_streaming_parser() {
+ assert_stream_equal(
+ r#"{ "foo":"bar", "array" : [0, 1, 2, 3, 4, 5], "idents":[null,true,false]}"#,
+ vec![
+ (ObjectStart, vec![]),
+ (StringValue("bar".to_string()), vec![Key("foo")]),
+ (ArrayStart, vec![Key("array")]),
+ (U64Value(0), vec![Key("array"), Index(0)]),
+ (U64Value(1), vec![Key("array"), Index(1)]),
+ (U64Value(2), vec![Key("array"), Index(2)]),
+ (U64Value(3), vec![Key("array"), Index(3)]),
+ (U64Value(4), vec![Key("array"), Index(4)]),
+ (U64Value(5), vec![Key("array"), Index(5)]),
+ (ArrayEnd, vec![Key("array")]),
+ (ArrayStart, vec![Key("idents")]),
+ (NullValue, vec![Key("idents"), Index(0)]),
+ (BooleanValue(true), vec![Key("idents"), Index(1)]),
+ (BooleanValue(false), vec![Key("idents"), Index(2)]),
+ (ArrayEnd, vec![Key("idents")]),
+ (ObjectEnd, vec![]),
+ ]
+ );
+ }
+ fn last_event(src: &str) -> JsonEvent {
+ let mut parser = Parser::new(src.chars());
+ let mut evt = NullValue;
+ loop {
+ evt = match parser.next() {
+ Some(e) => e,
+ None => return evt,
+ }
+ }
+ }
+
+ #[test]
+ #[cfg_attr(target_word_size = "32", ignore)] // FIXME(#14064)
+ fn test_read_object_streaming() {
+ assert_eq!(last_event("{ "), Error(SyntaxError(EOFWhileParsingObject, 1, 3)));
+ assert_eq!(last_event("{1"), Error(SyntaxError(KeyMustBeAString, 1, 2)));
+ assert_eq!(last_event("{ \"a\""), Error(SyntaxError(EOFWhileParsingObject, 1, 6)));
+ assert_eq!(last_event("{\"a\""), Error(SyntaxError(EOFWhileParsingObject, 1, 5)));
+ assert_eq!(last_event("{\"a\" "), Error(SyntaxError(EOFWhileParsingObject, 1, 6)));
+
+ assert_eq!(last_event("{\"a\" 1"), Error(SyntaxError(ExpectedColon, 1, 6)));
+ assert_eq!(last_event("{\"a\":"), Error(SyntaxError(EOFWhileParsingValue, 1, 6)));
+ assert_eq!(last_event("{\"a\":1"), Error(SyntaxError(EOFWhileParsingObject, 1, 7)));
+ assert_eq!(last_event("{\"a\":1 1"), Error(SyntaxError(InvalidSyntax, 1, 8)));
+ assert_eq!(last_event("{\"a\":1,"), Error(SyntaxError(EOFWhileParsingObject, 1, 8)));
+ assert_eq!(last_event("{\"a\":1,}"), Error(SyntaxError(TrailingComma, 1, 8)));
+
+ assert_stream_equal(
+ "{}",
+ vec![(ObjectStart, vec![]), (ObjectEnd, vec![])]
+ );
+ assert_stream_equal(
+ "{\"a\": 3}",
+ vec![
+ (ObjectStart, vec![]),
+ (U64Value(3), vec![Key("a")]),
+ (ObjectEnd, vec![]),
+ ]
+ );
+ assert_stream_equal(
+ "{ \"a\": null, \"b\" : true }",
+ vec![
+ (ObjectStart, vec![]),
+ (NullValue, vec![Key("a")]),
+ (BooleanValue(true), vec![Key("b")]),
+ (ObjectEnd, vec![]),
+ ]
+ );
+ assert_stream_equal(
+ "{\"a\" : 1.0 ,\"b\": [ true ]}",
+ vec![
+ (ObjectStart, vec![]),
+ (F64Value(1.0), vec![Key("a")]),
+ (ArrayStart, vec![Key("b")]),
+ (BooleanValue(true),vec![Key("b"), Index(0)]),
+ (ArrayEnd, vec![Key("b")]),
+ (ObjectEnd, vec![]),
+ ]
+ );
+ assert_stream_equal(
+ r#"{
+ "a": 1.0,
+ "b": [
+ true,
+ "foo\nbar",
+ { "c": {"d": null} }
+ ]
+ }"#,
+ vec![
+ (ObjectStart, vec![]),
+ (F64Value(1.0), vec![Key("a")]),
+ (ArrayStart, vec![Key("b")]),
+ (BooleanValue(true), vec![Key("b"), Index(0)]),
+ (StringValue("foo\nbar".to_string()), vec![Key("b"), Index(1)]),
+ (ObjectStart, vec![Key("b"), Index(2)]),
+ (ObjectStart, vec![Key("b"), Index(2), Key("c")]),
+ (NullValue, vec![Key("b"), Index(2), Key("c"), Key("d")]),
+ (ObjectEnd, vec![Key("b"), Index(2), Key("c")]),
+ (ObjectEnd, vec![Key("b"), Index(2)]),
+ (ArrayEnd, vec![Key("b")]),
+ (ObjectEnd, vec![]),
+ ]
+ );
+ }
+ #[test]
+ #[cfg_attr(target_word_size = "32", ignore)] // FIXME(#14064)
+ fn test_read_array_streaming() {
+ assert_stream_equal(
+ "[]",
+ vec![
+ (ArrayStart, vec![]),
+ (ArrayEnd, vec![]),
+ ]
+ );
+ assert_stream_equal(
+ "[ ]",
+ vec![
+ (ArrayStart, vec![]),
+ (ArrayEnd, vec![]),
+ ]
+ );
+ assert_stream_equal(
+ "[true]",
+ vec![
+ (ArrayStart, vec![]),
+ (BooleanValue(true), vec![Index(0)]),
+ (ArrayEnd, vec![]),
+ ]
+ );
+ assert_stream_equal(
+ "[ false ]",
+ vec![
+ (ArrayStart, vec![]),
+ (BooleanValue(false), vec![Index(0)]),
+ (ArrayEnd, vec![]),
+ ]
+ );
+ assert_stream_equal(
+ "[null]",
+ vec![
+ (ArrayStart, vec![]),
+ (NullValue, vec![Index(0)]),
+ (ArrayEnd, vec![]),
+ ]
+ );
+ assert_stream_equal(
+ "[3, 1]",
+ vec![
+ (ArrayStart, vec![]),
+ (U64Value(3), vec![Index(0)]),
+ (U64Value(1), vec![Index(1)]),
+ (ArrayEnd, vec![]),
+ ]
+ );
+ assert_stream_equal(
+ "\n[3, 2]\n",
+ vec![
+ (ArrayStart, vec![]),
+ (U64Value(3), vec![Index(0)]),
+ (U64Value(2), vec![Index(1)]),
+ (ArrayEnd, vec![]),
+ ]
+ );
+ assert_stream_equal(
+ "[2, [4, 1]]",
+ vec![
+ (ArrayStart, vec![]),
+ (U64Value(2), vec![Index(0)]),
+ (ArrayStart, vec![Index(1)]),
+ (U64Value(4), vec![Index(1), Index(0)]),
+ (U64Value(1), vec![Index(1), Index(1)]),
+ (ArrayEnd, vec![Index(1)]),
+ (ArrayEnd, vec![]),
+ ]
+ );
+
+ assert_eq!(last_event("["), Error(SyntaxError(EOFWhileParsingValue, 1, 2)));
+
+ assert_eq!(from_str("["), Err(SyntaxError(EOFWhileParsingValue, 1, 2)));
+ assert_eq!(from_str("[1"), Err(SyntaxError(EOFWhileParsingArray, 1, 3)));
+ assert_eq!(from_str("[1,"), Err(SyntaxError(EOFWhileParsingValue, 1, 4)));
+ assert_eq!(from_str("[1,]"), Err(SyntaxError(InvalidSyntax, 1, 4)));
+ assert_eq!(from_str("[6 7]"), Err(SyntaxError(InvalidSyntax, 1, 4)));
+
+ }
+ #[test]
+ fn test_trailing_characters_streaming() {
+ assert_eq!(last_event("nulla"), Error(SyntaxError(TrailingCharacters, 1, 5)));
+ assert_eq!(last_event("truea"), Error(SyntaxError(TrailingCharacters, 1, 5)));
+ assert_eq!(last_event("falsea"), Error(SyntaxError(TrailingCharacters, 1, 6)));
+ assert_eq!(last_event("1a"), Error(SyntaxError(TrailingCharacters, 1, 2)));
+ assert_eq!(last_event("[]a"), Error(SyntaxError(TrailingCharacters, 1, 3)));
+ assert_eq!(last_event("{}a"), Error(SyntaxError(TrailingCharacters, 1, 3)));
+ }
+ #[test]
+ fn test_read_identifiers_streaming() {
+ assert_eq!(Parser::new("null".chars()).next(), Some(NullValue));
+ assert_eq!(Parser::new("true".chars()).next(), Some(BooleanValue(true)));
+ assert_eq!(Parser::new("false".chars()).next(), Some(BooleanValue(false)));
+
+ assert_eq!(last_event("n"), Error(SyntaxError(InvalidSyntax, 1, 2)));
+ assert_eq!(last_event("nul"), Error(SyntaxError(InvalidSyntax, 1, 4)));
+ assert_eq!(last_event("t"), Error(SyntaxError(InvalidSyntax, 1, 2)));
+ assert_eq!(last_event("truz"), Error(SyntaxError(InvalidSyntax, 1, 4)));
+ assert_eq!(last_event("f"), Error(SyntaxError(InvalidSyntax, 1, 2)));
+ assert_eq!(last_event("faz"), Error(SyntaxError(InvalidSyntax, 1, 3)));
+ }
+
+ #[test]
+ fn test_stack() {
+ let mut stack = Stack::new();
+
+ assert!(stack.is_empty());
+ assert!(stack.len() == 0);
+ assert!(!stack.last_is_index());
+
+ stack.push_index(0);
+ stack.bump_index();
+
+ assert!(stack.len() == 1);
+ assert!(stack.is_equal_to(&[Index(1)]));
+ assert!(stack.starts_with(&[Index(1)]));
+ assert!(stack.ends_with(&[Index(1)]));
+ assert!(stack.last_is_index());
+ assert!(stack.get(0) == Index(1));
+
+ stack.push_key("foo".to_string());
+
+ assert!(stack.len() == 2);
+ assert!(stack.is_equal_to(&[Index(1), Key("foo")]));
+ assert!(stack.starts_with(&[Index(1), Key("foo")]));
+ assert!(stack.starts_with(&[Index(1)]));
+ assert!(stack.ends_with(&[Index(1), Key("foo")]));
+ assert!(stack.ends_with(&[Key("foo")]));
+ assert!(!stack.last_is_index());
+ assert!(stack.get(0) == Index(1));
+ assert!(stack.get(1) == Key("foo"));
+
+ stack.push_key("bar".to_string());
+
+ assert!(stack.len() == 3);
+ assert!(stack.is_equal_to(&[Index(1), Key("foo"), Key("bar")]));
+ assert!(stack.starts_with(&[Index(1)]));
+ assert!(stack.starts_with(&[Index(1), Key("foo")]));
+ assert!(stack.starts_with(&[Index(1), Key("foo"), Key("bar")]));
+ assert!(stack.ends_with(&[Key("bar")]));
+ assert!(stack.ends_with(&[Key("foo"), Key("bar")]));
+ assert!(stack.ends_with(&[Index(1), Key("foo"), Key("bar")]));
+ assert!(!stack.last_is_index());
+ assert!(stack.get(0) == Index(1));
+ assert!(stack.get(1) == Key("foo"));
+ assert!(stack.get(2) == Key("bar"));
+
+ stack.pop();
+
+ assert!(stack.len() == 2);
+ assert!(stack.is_equal_to(&[Index(1), Key("foo")]));
+ assert!(stack.starts_with(&[Index(1), Key("foo")]));
+ assert!(stack.starts_with(&[Index(1)]));
+ assert!(stack.ends_with(&[Index(1), Key("foo")]));
+ assert!(stack.ends_with(&[Key("foo")]));
+ assert!(!stack.last_is_index());
+ assert!(stack.get(0) == Index(1));
+ assert!(stack.get(1) == Key("foo"));
+ }
+
+ #[test]
+ fn test_to_json() {
+ use std::collections::{HashMap,BTreeMap};
+ use super::ToJson;
+
+ let array2 = Array(vec!(U64(1), U64(2)));
+ let array3 = Array(vec!(U64(1), U64(2), U64(3)));
+ let object = {
+ let mut tree_map = BTreeMap::new();
+ tree_map.insert("a".to_string(), U64(1));
+ tree_map.insert("b".to_string(), U64(2));
+ Object(tree_map)
+ };
+
+ assert_eq!(array2.to_json(), array2);
+ assert_eq!(object.to_json(), object);
+ assert_eq!(3_i.to_json(), I64(3));
+ assert_eq!(4_i8.to_json(), I64(4));
+ assert_eq!(5_i16.to_json(), I64(5));
+ assert_eq!(6_i32.to_json(), I64(6));
+ assert_eq!(7_i64.to_json(), I64(7));
+ assert_eq!(8_u.to_json(), U64(8));
+ assert_eq!(9_u8.to_json(), U64(9));
+ assert_eq!(10_u16.to_json(), U64(10));
+ assert_eq!(11_u32.to_json(), U64(11));
+ assert_eq!(12_u64.to_json(), U64(12));
+ assert_eq!(13.0_f32.to_json(), F64(13.0_f64));
+ assert_eq!(14.0_f64.to_json(), F64(14.0_f64));
+ assert_eq!(().to_json(), Null);
+ assert_eq!(f32::INFINITY.to_json(), Null);
+ assert_eq!(f64::NAN.to_json(), Null);
+ assert_eq!(true.to_json(), Boolean(true));
+ assert_eq!(false.to_json(), Boolean(false));
+ assert_eq!("abc".to_json(), String("abc".to_string()));
+ assert_eq!("abc".to_string().to_json(), String("abc".to_string()));
+ assert_eq!((1u, 2u).to_json(), array2);
+ assert_eq!((1u, 2u, 3u).to_json(), array3);
+ assert_eq!([1u, 2].to_json(), array2);
+ assert_eq!((&[1u, 2, 3]).to_json(), array3);
+ assert_eq!((vec![1u, 2]).to_json(), array2);
+ assert_eq!(vec!(1u, 2, 3).to_json(), array3);
+ let mut tree_map = BTreeMap::new();
+ tree_map.insert("a".to_string(), 1u);
+ tree_map.insert("b".to_string(), 2);
+ assert_eq!(tree_map.to_json(), object);
+ let mut hash_map = HashMap::new();
+ hash_map.insert("a".to_string(), 1u);
+ hash_map.insert("b".to_string(), 2);
+ assert_eq!(hash_map.to_json(), object);
+ assert_eq!(Some(15i).to_json(), I64(15));
+ assert_eq!(Some(15u).to_json(), U64(15));
+ assert_eq!(None::<int>.to_json(), Null);
+ }
+
+ #[bench]
+ fn bench_streaming_small(b: &mut Bencher) {
+ b.iter( || {
+ let mut parser = Parser::new(
+ r#"{
+ "a": 1.0,
+ "b": [
+ true,
+ "foo\nbar",
+ { "c": {"d": null} }
+ ]
+ }"#.chars()
+ );
+ loop {
+ match parser.next() {
+ None => return,
+ _ => {}
+ }
+ }
+ });
+ }
+ #[bench]
+ fn bench_small(b: &mut Bencher) {
+ b.iter( || {
+ let _ = from_str(r#"{
+ "a": 1.0,
+ "b": [
+ true,
+ "foo\nbar",
+ { "c": {"d": null} }
+ ]
+ }"#);
+ });
+ }
+
+ fn big_json() -> string::String {
+ let mut src = "[\n".to_string();
+ for _ in range(0i, 500) {
+ src.push_str(r#"{ "a": true, "b": null, "c":3.1415, "d": "Hello world", "e": \
+ [1,2,3]},"#);
+ }
+ src.push_str("{}]");
+ return src;
+ }
+
+ #[bench]
+ fn bench_streaming_large(b: &mut Bencher) {
+ let src = big_json();
+ b.iter( || {
+ let mut parser = Parser::new(src.chars());
+ loop {
+ match parser.next() {
+ None => return,
+ _ => {}
+ }
+ }
+ });
+ }
+ #[bench]
+ fn bench_large(b: &mut Bencher) {
+ let src = big_json();
+ b.iter( || { let _ = from_str(src.as_slice()); });
+ }
+}
use std::cell::{Cell, RefCell};
use std::sync::Arc;
-pub trait Encoder<E> {
+pub trait Encoder {
+ type Error;
+
// Primitive types:
- fn emit_nil(&mut self) -> Result<(), E>;
- fn emit_uint(&mut self, v: uint) -> Result<(), E>;
- fn emit_u64(&mut self, v: u64) -> Result<(), E>;
- fn emit_u32(&mut self, v: u32) -> Result<(), E>;
- fn emit_u16(&mut self, v: u16) -> Result<(), E>;
- fn emit_u8(&mut self, v: u8) -> Result<(), E>;
- fn emit_int(&mut self, v: int) -> Result<(), E>;
- fn emit_i64(&mut self, v: i64) -> Result<(), E>;
- fn emit_i32(&mut self, v: i32) -> Result<(), E>;
- fn emit_i16(&mut self, v: i16) -> Result<(), E>;
- fn emit_i8(&mut self, v: i8) -> Result<(), E>;
- fn emit_bool(&mut self, v: bool) -> Result<(), E>;
- fn emit_f64(&mut self, v: f64) -> Result<(), E>;
- fn emit_f32(&mut self, v: f32) -> Result<(), E>;
- fn emit_char(&mut self, v: char) -> Result<(), E>;
- fn emit_str(&mut self, v: &str) -> Result<(), E>;
+ fn emit_nil(&mut self) -> Result<(), Self::Error>;
+ fn emit_uint(&mut self, v: uint) -> Result<(), Self::Error>;
+ fn emit_u64(&mut self, v: u64) -> Result<(), Self::Error>;
+ fn emit_u32(&mut self, v: u32) -> Result<(), Self::Error>;
+ fn emit_u16(&mut self, v: u16) -> Result<(), Self::Error>;
+ fn emit_u8(&mut self, v: u8) -> Result<(), Self::Error>;
+ fn emit_int(&mut self, v: int) -> Result<(), Self::Error>;
+ fn emit_i64(&mut self, v: i64) -> Result<(), Self::Error>;
+ fn emit_i32(&mut self, v: i32) -> Result<(), Self::Error>;
+ fn emit_i16(&mut self, v: i16) -> Result<(), Self::Error>;
+ fn emit_i8(&mut self, v: i8) -> Result<(), Self::Error>;
+ fn emit_bool(&mut self, v: bool) -> Result<(), Self::Error>;
+ fn emit_f64(&mut self, v: f64) -> Result<(), Self::Error>;
+ fn emit_f32(&mut self, v: f32) -> Result<(), Self::Error>;
+ fn emit_char(&mut self, v: char) -> Result<(), Self::Error>;
+ fn emit_str(&mut self, v: &str) -> Result<(), Self::Error>;
// Compound types:
- fn emit_enum<F>(&mut self, name: &str, f: F) -> Result<(), E> where
- F: FnOnce(&mut Self) -> Result<(), E>;
+ fn emit_enum<F>(&mut self, name: &str, f: F) -> Result<(), Self::Error>
+ where F: FnOnce(&mut Self) -> Result<(), Self::Error>;
fn emit_enum_variant<F>(&mut self, v_name: &str,
v_id: uint,
len: uint,
- f: F) -> Result<(), E> where
- F: FnOnce(&mut Self) -> Result<(), E>;
- fn emit_enum_variant_arg<F>(&mut self, a_idx: uint, f: F) -> Result<(), E> where
- F: FnOnce(&mut Self) -> Result<(), E>;
+ f: F) -> Result<(), Self::Error>
+ where F: FnOnce(&mut Self) -> Result<(), Self::Error>;
+ fn emit_enum_variant_arg<F>(&mut self, a_idx: uint, f: F)
+ -> Result<(), Self::Error>
+ where F: FnOnce(&mut Self) -> Result<(), Self::Error>;
fn emit_enum_struct_variant<F>(&mut self, v_name: &str,
v_id: uint,
len: uint,
- f: F) -> Result<(), E> where
- F: FnOnce(&mut Self) -> Result<(), E>;
+ f: F) -> Result<(), Self::Error>
+ where F: FnOnce(&mut Self) -> Result<(), Self::Error>;
fn emit_enum_struct_variant_field<F>(&mut self,
f_name: &str,
f_idx: uint,
- f: F) -> Result<(), E> where
- F: FnOnce(&mut Self) -> Result<(), E>;
+ f: F) -> Result<(), Self::Error>
+ where F: FnOnce(&mut Self) -> Result<(), Self::Error>;
+
+ fn emit_struct<F>(&mut self, name: &str, len: uint, f: F)
+ -> Result<(), Self::Error>
+ where F: FnOnce(&mut Self) -> Result<(), Self::Error>;
+ fn emit_struct_field<F>(&mut self, f_name: &str, f_idx: uint, f: F)
+ -> Result<(), Self::Error>
+ where F: FnOnce(&mut Self) -> Result<(), Self::Error>;
+
+ fn emit_tuple<F>(&mut self, len: uint, f: F) -> Result<(), Self::Error>
+ where F: FnOnce(&mut Self) -> Result<(), Self::Error>;
+ fn emit_tuple_arg<F>(&mut self, idx: uint, f: F) -> Result<(), Self::Error>
+ where F: FnOnce(&mut Self) -> Result<(), Self::Error>;
+
+ fn emit_tuple_struct<F>(&mut self, name: &str, len: uint, f: F)
+ -> Result<(), Self::Error>
+ where F: FnOnce(&mut Self) -> Result<(), Self::Error>;
+ fn emit_tuple_struct_arg<F>(&mut self, f_idx: uint, f: F)
+ -> Result<(), Self::Error>
+ where F: FnOnce(&mut Self) -> Result<(), Self::Error>;
+
+ // Specialized types:
+ fn emit_option<F>(&mut self, f: F) -> Result<(), Self::Error>
+ where F: FnOnce(&mut Self) -> Result<(), Self::Error>;
+ fn emit_option_none(&mut self) -> Result<(), Self::Error>;
+ fn emit_option_some<F>(&mut self, f: F) -> Result<(), Self::Error>
+ where F: FnOnce(&mut Self) -> Result<(), Self::Error>;
- fn emit_struct<F>(&mut self, name: &str, len: uint, f: F) -> Result<(), E> where
- F: FnOnce(&mut Self) -> Result<(), E>;
- fn emit_struct_field<F>(&mut self, f_name: &str, f_idx: uint, f: F) -> Result<(), E> where
- F: FnOnce(&mut Self) -> Result<(), E>;
+ fn emit_seq<F>(&mut self, len: uint, f: F) -> Result<(), Self::Error>
+ where F: FnOnce(&mut Self) -> Result<(), Self::Error>;
+ fn emit_seq_elt<F>(&mut self, idx: uint, f: F) -> Result<(), Self::Error>
+ where F: FnOnce(&mut Self) -> Result<(), Self::Error>;
- fn emit_tuple<F>(&mut self, len: uint, f: F) -> Result<(), E> where
- F: FnOnce(&mut Self) -> Result<(), E>;
- fn emit_tuple_arg<F>(&mut self, idx: uint, f: F) -> Result<(), E> where
- F: FnOnce(&mut Self) -> Result<(), E>;
+ fn emit_map<F>(&mut self, len: uint, f: F) -> Result<(), Self::Error>
+ where F: FnOnce(&mut Self) -> Result<(), Self::Error>;
+ fn emit_map_elt_key<F>(&mut self, idx: uint, f: F) -> Result<(), Self::Error>
+ where F: FnMut(&mut Self) -> Result<(), Self::Error>;
+ fn emit_map_elt_val<F>(&mut self, idx: uint, f: F) -> Result<(), Self::Error>
+ where F: FnOnce(&mut Self) -> Result<(), Self::Error>;
+}
- fn emit_tuple_struct<F>(&mut self, name: &str, len: uint, f: F) -> Result<(), E> where
- F: FnOnce(&mut Self) -> Result<(), E>;
- fn emit_tuple_struct_arg<F>(&mut self, f_idx: uint, f: F) -> Result<(), E> where
- F: FnOnce(&mut Self) -> Result<(), E>;
+pub trait Decoder {
+ type Error;
- // Specialized types:
- fn emit_option<F>(&mut self, f: F) -> Result<(), E> where
- F: FnOnce(&mut Self) -> Result<(), E>;
- fn emit_option_none(&mut self) -> Result<(), E>;
- fn emit_option_some<F>(&mut self, f: F) -> Result<(), E> where
- F: FnOnce(&mut Self) -> Result<(), E>;
-
- fn emit_seq<F>(&mut self, len: uint, f: F) -> Result<(), E> where
- F: FnOnce(&mut Self) -> Result<(), E>;
- fn emit_seq_elt<F>(&mut self, idx: uint, f: F) -> Result<(), E> where
- F: FnOnce(&mut Self) -> Result<(), E>;
-
- fn emit_map<F>(&mut self, len: uint, f: F) -> Result<(), E> where
- F: FnOnce(&mut Self) -> Result<(), E>;
- fn emit_map_elt_key<F>(&mut self, idx: uint, f: F) -> Result<(), E> where
- F: FnMut(&mut Self) -> Result<(), E>;
- fn emit_map_elt_val<F>(&mut self, idx: uint, f: F) -> Result<(), E> where
- F: FnOnce(&mut Self) -> Result<(), E>;
-}
-
-pub trait Decoder<E> {
// Primitive types:
- fn read_nil(&mut self) -> Result<(), E>;
- fn read_uint(&mut self) -> Result<uint, E>;
- fn read_u64(&mut self) -> Result<u64, E>;
- fn read_u32(&mut self) -> Result<u32, E>;
- fn read_u16(&mut self) -> Result<u16, E>;
- fn read_u8(&mut self) -> Result<u8, E>;
- fn read_int(&mut self) -> Result<int, E>;
- fn read_i64(&mut self) -> Result<i64, E>;
- fn read_i32(&mut self) -> Result<i32, E>;
- fn read_i16(&mut self) -> Result<i16, E>;
- fn read_i8(&mut self) -> Result<i8, E>;
- fn read_bool(&mut self) -> Result<bool, E>;
- fn read_f64(&mut self) -> Result<f64, E>;
- fn read_f32(&mut self) -> Result<f32, E>;
- fn read_char(&mut self) -> Result<char, E>;
- fn read_str(&mut self) -> Result<String, E>;
+ fn read_nil(&mut self) -> Result<(), Self::Error>;
+ fn read_uint(&mut self) -> Result<uint, Self::Error>;
+ fn read_u64(&mut self) -> Result<u64, Self::Error>;
+ fn read_u32(&mut self) -> Result<u32, Self::Error>;
+ fn read_u16(&mut self) -> Result<u16, Self::Error>;
+ fn read_u8(&mut self) -> Result<u8, Self::Error>;
+ fn read_int(&mut self) -> Result<int, Self::Error>;
+ fn read_i64(&mut self) -> Result<i64, Self::Error>;
+ fn read_i32(&mut self) -> Result<i32, Self::Error>;
+ fn read_i16(&mut self) -> Result<i16, Self::Error>;
+ fn read_i8(&mut self) -> Result<i8, Self::Error>;
+ fn read_bool(&mut self) -> Result<bool, Self::Error>;
+ fn read_f64(&mut self) -> Result<f64, Self::Error>;
+ fn read_f32(&mut self) -> Result<f32, Self::Error>;
+ fn read_char(&mut self) -> Result<char, Self::Error>;
+ fn read_str(&mut self) -> Result<String, Self::Error>;
// Compound types:
- fn read_enum<T, F>(&mut self, name: &str, f: F) -> Result<T, E> where
- F: FnOnce(&mut Self) -> Result<T, E>;
-
- fn read_enum_variant<T, F>(&mut self, names: &[&str], f: F) -> Result<T, E> where
- F: FnMut(&mut Self, uint) -> Result<T, E>;
- fn read_enum_variant_arg<T, F>(&mut self, a_idx: uint, f: F) -> Result<T, E> where
- F: FnOnce(&mut Self) -> Result<T, E>;
-
- fn read_enum_struct_variant<T, F>(&mut self, names: &[&str], f: F) -> Result<T, E> where
- F: FnMut(&mut Self, uint) -> Result<T, E>;
+ fn read_enum<T, F>(&mut self, name: &str, f: F) -> Result<T, Self::Error>
+ where F: FnOnce(&mut Self) -> Result<T, Self::Error>;
+
+ fn read_enum_variant<T, F>(&mut self, names: &[&str], f: F)
+ -> Result<T, Self::Error>
+ where F: FnMut(&mut Self, uint) -> Result<T, Self::Error>;
+ fn read_enum_variant_arg<T, F>(&mut self, a_idx: uint, f: F)
+ -> Result<T, Self::Error>
+ where F: FnOnce(&mut Self) -> Result<T, Self::Error>;
+
+ fn read_enum_struct_variant<T, F>(&mut self, names: &[&str], f: F)
+ -> Result<T, Self::Error>
+ where F: FnMut(&mut Self, uint) -> Result<T, Self::Error>;
fn read_enum_struct_variant_field<T, F>(&mut self,
&f_name: &str,
f_idx: uint,
f: F)
- -> Result<T, E> where
- F: FnOnce(&mut Self) -> Result<T, E>;
+ -> Result<T, Self::Error>
+ where F: FnOnce(&mut Self) -> Result<T, Self::Error>;
- fn read_struct<T, F>(&mut self, s_name: &str, len: uint, f: F) -> Result<T, E> where
- F: FnOnce(&mut Self) -> Result<T, E>;
+ fn read_struct<T, F>(&mut self, s_name: &str, len: uint, f: F)
+ -> Result<T, Self::Error>
+ where F: FnOnce(&mut Self) -> Result<T, Self::Error>;
fn read_struct_field<T, F>(&mut self,
f_name: &str,
f_idx: uint,
f: F)
- -> Result<T, E> where
- F: FnOnce(&mut Self) -> Result<T, E>;
-
- fn read_tuple<T, F>(&mut self, len: uint, f: F) -> Result<T, E> where
- F: FnOnce(&mut Self) -> Result<T, E>;
- fn read_tuple_arg<T, F>(&mut self, a_idx: uint, f: F) -> Result<T, E> where
- F: FnOnce(&mut Self) -> Result<T, E>;
-
- fn read_tuple_struct<T, F>(&mut self, s_name: &str, len: uint, f: F) -> Result<T, E> where
- F: FnOnce(&mut Self) -> Result<T, E>;
- fn read_tuple_struct_arg<T, F>(&mut self, a_idx: uint, f: F) -> Result<T, E> where
- F: FnOnce(&mut Self) -> Result<T, E>;
+ -> Result<T, Self::Error>
+ where F: FnOnce(&mut Self) -> Result<T, Self::Error>;
+
+ fn read_tuple<T, F>(&mut self, len: uint, f: F) -> Result<T, Self::Error>
+ where F: FnOnce(&mut Self) -> Result<T, Self::Error>;
+ fn read_tuple_arg<T, F>(&mut self, a_idx: uint, f: F)
+ -> Result<T, Self::Error>
+ where F: FnOnce(&mut Self) -> Result<T, Self::Error>;
+
+ fn read_tuple_struct<T, F>(&mut self, s_name: &str, len: uint, f: F)
+ -> Result<T, Self::Error>
+ where F: FnOnce(&mut Self) -> Result<T, Self::Error>;
+ fn read_tuple_struct_arg<T, F>(&mut self, a_idx: uint, f: F)
+ -> Result<T, Self::Error>
+ where F: FnOnce(&mut Self) -> Result<T, Self::Error>;
// Specialized types:
- fn read_option<T, F>(&mut self, f: F) -> Result<T, E> where
- F: FnMut(&mut Self, bool) -> Result<T, E>;
-
- fn read_seq<T, F>(&mut self, f: F) -> Result<T, E> where
- F: FnOnce(&mut Self, uint) -> Result<T, E>;
- fn read_seq_elt<T, F>(&mut self, idx: uint, f: F) -> Result<T, E> where
- F: FnOnce(&mut Self) -> Result<T, E>;
-
- fn read_map<T, F>(&mut self, f: F) -> Result<T, E> where
- F: FnOnce(&mut Self, uint) -> Result<T, E>;
- fn read_map_elt_key<T, F>(&mut self, idx: uint, f: F) -> Result<T, E> where
- F: FnOnce(&mut Self) -> Result<T, E>;
- fn read_map_elt_val<T, F>(&mut self, idx: uint, f: F) -> Result<T, E> where
- F: FnOnce(&mut Self) -> Result<T, E>;
+ fn read_option<T, F>(&mut self, f: F) -> Result<T, Self::Error>
+ where F: FnMut(&mut Self, bool) -> Result<T, Self::Error>;
+
+ fn read_seq<T, F>(&mut self, f: F) -> Result<T, Self::Error>
+ where F: FnOnce(&mut Self, uint) -> Result<T, Self::Error>;
+ fn read_seq_elt<T, F>(&mut self, idx: uint, f: F) -> Result<T, Self::Error>
+ where F: FnOnce(&mut Self) -> Result<T, Self::Error>;
+
+ fn read_map<T, F>(&mut self, f: F) -> Result<T, Self::Error>
+ where F: FnOnce(&mut Self, uint) -> Result<T, Self::Error>;
+ fn read_map_elt_key<T, F>(&mut self, idx: uint, f: F)
+ -> Result<T, Self::Error>
+ where F: FnOnce(&mut Self) -> Result<T, Self::Error>;
+ fn read_map_elt_val<T, F>(&mut self, idx: uint, f: F)
+ -> Result<T, Self::Error>
+ where F: FnOnce(&mut Self) -> Result<T, Self::Error>;
// Failure
- fn error(&mut self, err: &str) -> E;
+ fn error(&mut self, err: &str) -> Self::Error;
}
-pub trait Encodable<S:Encoder<E>, E> for Sized? {
- fn encode(&self, s: &mut S) -> Result<(), E>;
+pub trait Encodable for Sized? {
+ fn encode<S: Encoder>(&self, s: &mut S) -> Result<(), S::Error>;
}
-pub trait Decodable<D:Decoder<E>, E> {
- fn decode(d: &mut D) -> Result<Self, E>;
+pub trait Decodable {
+ fn decode<D: Decoder>(d: &mut D) -> Result<Self, D::Error>;
}
-impl<E, S:Encoder<E>> Encodable<S, E> for uint {
- fn encode(&self, s: &mut S) -> Result<(), E> {
+impl Encodable for uint {
+ fn encode<S: Encoder>(&self, s: &mut S) -> Result<(), S::Error> {
s.emit_uint(*self)
}
}
-impl<E, D:Decoder<E>> Decodable<D, E> for uint {
- fn decode(d: &mut D) -> Result<uint, E> {
+impl Decodable for uint {
+ fn decode<D: Decoder>(d: &mut D) -> Result<uint, D::Error> {
d.read_uint()
}
}
-impl<E, S:Encoder<E>> Encodable<S, E> for u8 {
- fn encode(&self, s: &mut S) -> Result<(), E> {
+impl Encodable for u8 {
+ fn encode<S: Encoder>(&self, s: &mut S) -> Result<(), S::Error> {
s.emit_u8(*self)
}
}
-impl<E, D:Decoder<E>> Decodable<D, E> for u8 {
- fn decode(d: &mut D) -> Result<u8, E> {
+impl Decodable for u8 {
+ fn decode<D: Decoder>(d: &mut D) -> Result<u8, D::Error> {
d.read_u8()
}
}
-impl<E, S:Encoder<E>> Encodable<S, E> for u16 {
- fn encode(&self, s: &mut S) -> Result<(), E> {
+impl Encodable for u16 {
+ fn encode<S: Encoder>(&self, s: &mut S) -> Result<(), S::Error> {
s.emit_u16(*self)
}
}
-impl<E, D:Decoder<E>> Decodable<D, E> for u16 {
- fn decode(d: &mut D) -> Result<u16, E> {
+impl Decodable for u16 {
+ fn decode<D: Decoder>(d: &mut D) -> Result<u16, D::Error> {
d.read_u16()
}
}
-impl<E, S:Encoder<E>> Encodable<S, E> for u32 {
- fn encode(&self, s: &mut S) -> Result<(), E> {
+impl Encodable for u32 {
+ fn encode<S: Encoder>(&self, s: &mut S) -> Result<(), S::Error> {
s.emit_u32(*self)
}
}
-impl<E, D:Decoder<E>> Decodable<D, E> for u32 {
- fn decode(d: &mut D) -> Result<u32, E> {
+impl Decodable for u32 {
+ fn decode<D: Decoder>(d: &mut D) -> Result<u32, D::Error> {
d.read_u32()
}
}
-impl<E, S:Encoder<E>> Encodable<S, E> for u64 {
- fn encode(&self, s: &mut S) -> Result<(), E> {
+impl Encodable for u64 {
+ fn encode<S: Encoder>(&self, s: &mut S) -> Result<(), S::Error> {
s.emit_u64(*self)
}
}
-impl<E, D:Decoder<E>> Decodable<D, E> for u64 {
- fn decode(d: &mut D) -> Result<u64, E> {
+impl Decodable for u64 {
+ fn decode<D: Decoder>(d: &mut D) -> Result<u64, D::Error> {
d.read_u64()
}
}
-impl<E, S:Encoder<E>> Encodable<S, E> for int {
- fn encode(&self, s: &mut S) -> Result<(), E> {
+impl Encodable for int {
+ fn encode<S: Encoder>(&self, s: &mut S) -> Result<(), S::Error> {
s.emit_int(*self)
}
}
-impl<E, D:Decoder<E>> Decodable<D, E> for int {
- fn decode(d: &mut D) -> Result<int, E> {
+impl Decodable for int {
+ fn decode<D: Decoder>(d: &mut D) -> Result<int, D::Error> {
d.read_int()
}
}
-impl<E, S:Encoder<E>> Encodable<S, E> for i8 {
- fn encode(&self, s: &mut S) -> Result<(), E> {
+impl Encodable for i8 {
+ fn encode<S: Encoder>(&self, s: &mut S) -> Result<(), S::Error> {
s.emit_i8(*self)
}
}
-impl<E, D:Decoder<E>> Decodable<D, E> for i8 {
- fn decode(d: &mut D) -> Result<i8, E> {
+impl Decodable for i8 {
+ fn decode<D: Decoder>(d: &mut D) -> Result<i8, D::Error> {
d.read_i8()
}
}
-impl<E, S:Encoder<E>> Encodable<S, E> for i16 {
- fn encode(&self, s: &mut S) -> Result<(), E> {
+impl Encodable for i16 {
+ fn encode<S: Encoder>(&self, s: &mut S) -> Result<(), S::Error> {
s.emit_i16(*self)
}
}
-impl<E, D:Decoder<E>> Decodable<D, E> for i16 {
- fn decode(d: &mut D) -> Result<i16, E> {
+impl Decodable for i16 {
+ fn decode<D: Decoder>(d: &mut D) -> Result<i16, D::Error> {
d.read_i16()
}
}
-impl<E, S:Encoder<E>> Encodable<S, E> for i32 {
- fn encode(&self, s: &mut S) -> Result<(), E> {
+impl Encodable for i32 {
+ fn encode<S: Encoder>(&self, s: &mut S) -> Result<(), S::Error> {
s.emit_i32(*self)
}
}
-impl<E, D:Decoder<E>> Decodable<D, E> for i32 {
- fn decode(d: &mut D) -> Result<i32, E> {
+impl Decodable for i32 {
+ fn decode<D: Decoder>(d: &mut D) -> Result<i32, D::Error> {
d.read_i32()
}
}
-impl<E, S:Encoder<E>> Encodable<S, E> for i64 {
- fn encode(&self, s: &mut S) -> Result<(), E> {
+impl Encodable for i64 {
+ fn encode<S: Encoder>(&self, s: &mut S) -> Result<(), S::Error> {
s.emit_i64(*self)
}
}
-impl<E, D:Decoder<E>> Decodable<D, E> for i64 {
- fn decode(d: &mut D) -> Result<i64, E> {
+impl Decodable for i64 {
+ fn decode<D: Decoder>(d: &mut D) -> Result<i64, D::Error> {
d.read_i64()
}
}
-impl<E, S:Encoder<E>> Encodable<S, E> for str {
- fn encode(&self, s: &mut S) -> Result<(), E> {
+impl Encodable for str {
+ fn encode<S: Encoder>(&self, s: &mut S) -> Result<(), S::Error> {
s.emit_str(self)
}
}
-impl<E, S:Encoder<E>> Encodable<S, E> for String {
- fn encode(&self, s: &mut S) -> Result<(), E> {
+impl Encodable for String {
+ fn encode<S: Encoder>(&self, s: &mut S) -> Result<(), S::Error> {
s.emit_str(self[])
}
}
-impl<E, D:Decoder<E>> Decodable<D, E> for String {
- fn decode(d: &mut D) -> Result<String, E> {
+impl Decodable for String {
+ fn decode<D: Decoder>(d: &mut D) -> Result<String, D::Error> {
d.read_str()
}
}
-impl<E, S:Encoder<E>> Encodable<S, E> for f32 {
- fn encode(&self, s: &mut S) -> Result<(), E> {
+impl Encodable for f32 {
+ fn encode<S: Encoder>(&self, s: &mut S) -> Result<(), S::Error> {
s.emit_f32(*self)
}
}
-impl<E, D:Decoder<E>> Decodable<D, E> for f32 {
- fn decode(d: &mut D) -> Result<f32, E> {
+impl Decodable for f32 {
+ fn decode<D: Decoder>(d: &mut D) -> Result<f32, D::Error> {
d.read_f32()
}
}
-impl<E, S:Encoder<E>> Encodable<S, E> for f64 {
- fn encode(&self, s: &mut S) -> Result<(), E> {
+impl Encodable for f64 {
+ fn encode<S: Encoder>(&self, s: &mut S) -> Result<(), S::Error> {
s.emit_f64(*self)
}
}
-impl<E, D:Decoder<E>> Decodable<D, E> for f64 {
- fn decode(d: &mut D) -> Result<f64, E> {
+impl Decodable for f64 {
+ fn decode<D: Decoder>(d: &mut D) -> Result<f64, D::Error> {
d.read_f64()
}
}
-impl<E, S:Encoder<E>> Encodable<S, E> for bool {
- fn encode(&self, s: &mut S) -> Result<(), E> {
+impl Encodable for bool {
+ fn encode<S: Encoder>(&self, s: &mut S) -> Result<(), S::Error> {
s.emit_bool(*self)
}
}
-impl<E, D:Decoder<E>> Decodable<D, E> for bool {
- fn decode(d: &mut D) -> Result<bool, E> {
+impl Decodable for bool {
+ fn decode<D: Decoder>(d: &mut D) -> Result<bool, D::Error> {
d.read_bool()
}
}
-impl<E, S:Encoder<E>> Encodable<S, E> for char {
- fn encode(&self, s: &mut S) -> Result<(), E> {
+impl Encodable for char {
+ fn encode<S: Encoder>(&self, s: &mut S) -> Result<(), S::Error> {
s.emit_char(*self)
}
}
-impl<E, D:Decoder<E>> Decodable<D, E> for char {
- fn decode(d: &mut D) -> Result<char, E> {
+impl Decodable for char {
+ fn decode<D: Decoder>(d: &mut D) -> Result<char, D::Error> {
d.read_char()
}
}
-impl<E, S:Encoder<E>> Encodable<S, E> for () {
- fn encode(&self, s: &mut S) -> Result<(), E> {
+impl Encodable for () {
+ fn encode<S: Encoder>(&self, s: &mut S) -> Result<(), S::Error> {
s.emit_nil()
}
}
-impl<E, D:Decoder<E>> Decodable<D, E> for () {
- fn decode(d: &mut D) -> Result<(), E> {
+impl Decodable for () {
+ fn decode<D: Decoder>(d: &mut D) -> Result<(), D::Error> {
d.read_nil()
}
}
-impl<'a, E, S: Encoder<E>, Sized? T: Encodable<S, E>> Encodable<S, E> for &'a T {
- fn encode(&self, s: &mut S) -> Result<(), E> {
+impl<'a, Sized? T: Encodable> Encodable for &'a T {
+ fn encode<S: Encoder>(&self, s: &mut S) -> Result<(), S::Error> {
(**self).encode(s)
}
}
-impl<E, S: Encoder<E>, Sized? T: Encodable<S, E>> Encodable<S, E> for Box<T> {
- fn encode(&self, s: &mut S) -> Result<(), E> {
+impl<Sized? T: Encodable> Encodable for Box<T> {
+ fn encode<S: Encoder>(&self, s: &mut S) -> Result<(), S::Error> {
(**self).encode(s)
}
}
-impl<E, D:Decoder<E>, T: Decodable<D, E>> Decodable<D, E> for Box<T> {
- fn decode(d: &mut D) -> Result<Box<T>, E> {
+impl< T: Decodable> Decodable for Box<T> {
+ fn decode<D: Decoder>(d: &mut D) -> Result<Box<T>, D::Error> {
Ok(box try!(Decodable::decode(d)))
}
}
-impl<E, D:Decoder<E>, T: Decodable<D, E>> Decodable<D, E> for Box<[T]> {
- fn decode(d: &mut D) -> Result<Box<[T]>, E> {
+impl< T: Decodable> Decodable for Box<[T]> {
+ fn decode<D: Decoder>(d: &mut D) -> Result<Box<[T]>, D::Error> {
let v: Vec<T> = try!(Decodable::decode(d));
Ok(v.into_boxed_slice())
}
}
-impl<E, S:Encoder<E>,T:Encodable<S, E>> Encodable<S, E> for Rc<T> {
+impl<T:Encodable> Encodable for Rc<T> {
#[inline]
- fn encode(&self, s: &mut S) -> Result<(), E> {
+ fn encode<S: Encoder>(&self, s: &mut S) -> Result<(), S::Error> {
(**self).encode(s)
}
}
-impl<E, D:Decoder<E>,T:Decodable<D, E>> Decodable<D, E> for Rc<T> {
+impl<T:Decodable> Decodable for Rc<T> {
#[inline]
- fn decode(d: &mut D) -> Result<Rc<T>, E> {
+ fn decode<D: Decoder>(d: &mut D) -> Result<Rc<T>, D::Error> {
Ok(Rc::new(try!(Decodable::decode(d))))
}
}
-impl<E, S:Encoder<E>,T:Encodable<S, E>> Encodable<S, E> for [T] {
- fn encode(&self, s: &mut S) -> Result<(), E> {
+impl<T:Encodable> Encodable for [T] {
+ fn encode<S: Encoder>(&self, s: &mut S) -> Result<(), S::Error> {
s.emit_seq(self.len(), |s| {
for (i, e) in self.iter().enumerate() {
try!(s.emit_seq_elt(i, |s| e.encode(s)))
}
}
-impl<E, S:Encoder<E>,T:Encodable<S, E>> Encodable<S, E> for Vec<T> {
- fn encode(&self, s: &mut S) -> Result<(), E> {
+impl<T:Encodable> Encodable for Vec<T> {
+ fn encode<S: Encoder>(&self, s: &mut S) -> Result<(), S::Error> {
s.emit_seq(self.len(), |s| {
for (i, e) in self.iter().enumerate() {
try!(s.emit_seq_elt(i, |s| e.encode(s)))
}
}
-impl<E, D:Decoder<E>,T:Decodable<D, E>> Decodable<D, E> for Vec<T> {
- fn decode(d: &mut D) -> Result<Vec<T>, E> {
+impl<T:Decodable> Decodable for Vec<T> {
+ fn decode<D: Decoder>(d: &mut D) -> Result<Vec<T>, D::Error> {
d.read_seq(|d, len| {
let mut v = Vec::with_capacity(len);
for i in range(0, len) {
}
}
-impl<E, S:Encoder<E>,T:Encodable<S, E>> Encodable<S, E> for Option<T> {
- fn encode(&self, s: &mut S) -> Result<(), E> {
+impl<T:Encodable> Encodable for Option<T> {
+ fn encode<S: Encoder>(&self, s: &mut S) -> Result<(), S::Error> {
s.emit_option(|s| {
match *self {
None => s.emit_option_none(),
}
}
-impl<E, D:Decoder<E>,T:Decodable<D, E>> Decodable<D, E> for Option<T> {
- fn decode(d: &mut D) -> Result<Option<T>, E> {
+impl<T:Decodable> Decodable for Option<T> {
+ fn decode<D: Decoder>(d: &mut D) -> Result<Option<T>, D::Error> {
d.read_option(|d, b| {
if b {
Ok(Some(try!(Decodable::decode(d))))
macro_rules! tuple {
() => ();
( $($name:ident,)+ ) => (
- impl<E, D:Decoder<E>,$($name:Decodable<D, E>),*> Decodable<D,E> for ($($name,)*) {
+ impl<$($name:Decodable),*> Decodable for ($($name,)*) {
#[allow(non_snake_case)]
- fn decode(d: &mut D) -> Result<($($name,)*), E> {
+ fn decode<D: Decoder>(d: &mut D) -> Result<($($name,)*), D::Error> {
let len: uint = count_idents!($($name),*);
d.read_tuple(len, |d| {
let mut i = 0;
- let ret = ($(try!(d.read_tuple_arg({ i+=1; i-1 }, |d| -> Result<$name,E> {
+ let ret = ($(try!(d.read_tuple_arg({ i+=1; i-1 },
+ |d| -> Result<$name,D::Error> {
Decodable::decode(d)
})),)*);
return Ok(ret);
})
}
}
- impl<E, S:Encoder<E>,$($name:Encodable<S, E>),*> Encodable<S, E> for ($($name,)*) {
+ impl<$($name:Encodable),*> Encodable for ($($name,)*) {
#[allow(non_snake_case)]
- fn encode(&self, s: &mut S) -> Result<(), E> {
+ fn encode<S: Encoder>(&self, s: &mut S) -> Result<(), S::Error> {
let ($(ref $name,)*) = *self;
let mut n = 0;
$(let $name = $name; n += 1;)*
tuple! { T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, }
-impl<E, S: Encoder<E>> Encodable<S, E> for path::posix::Path {
- fn encode(&self, e: &mut S) -> Result<(), E> {
+impl Encodable for path::posix::Path {
+ fn encode<S: Encoder>(&self, e: &mut S) -> Result<(), S::Error> {
self.as_vec().encode(e)
}
}
-impl<E, D: Decoder<E>> Decodable<D, E> for path::posix::Path {
- fn decode(d: &mut D) -> Result<path::posix::Path, E> {
+impl Decodable for path::posix::Path {
+ fn decode<D: Decoder>(d: &mut D) -> Result<path::posix::Path, D::Error> {
let bytes: Vec<u8> = try!(Decodable::decode(d));
Ok(path::posix::Path::new(bytes))
}
}
-impl<E, S: Encoder<E>> Encodable<S, E> for path::windows::Path {
- fn encode(&self, e: &mut S) -> Result<(), E> {
+impl Encodable for path::windows::Path {
+ fn encode<S: Encoder>(&self, e: &mut S) -> Result<(), S::Error> {
self.as_vec().encode(e)
}
}
-impl<E, D: Decoder<E>> Decodable<D, E> for path::windows::Path {
- fn decode(d: &mut D) -> Result<path::windows::Path, E> {
+impl Decodable for path::windows::Path {
+ fn decode<D: Decoder>(d: &mut D) -> Result<path::windows::Path, D::Error> {
let bytes: Vec<u8> = try!(Decodable::decode(d));
Ok(path::windows::Path::new(bytes))
}
}
-impl<E, S: Encoder<E>, T: Encodable<S, E> + Copy> Encodable<S, E> for Cell<T> {
- fn encode(&self, s: &mut S) -> Result<(), E> {
+impl<T: Encodable + Copy> Encodable for Cell<T> {
+ fn encode<S: Encoder>(&self, s: &mut S) -> Result<(), S::Error> {
self.get().encode(s)
}
}
-impl<E, D: Decoder<E>, T: Decodable<D, E> + Copy> Decodable<D, E> for Cell<T> {
- fn decode(d: &mut D) -> Result<Cell<T>, E> {
+impl<T: Decodable + Copy> Decodable for Cell<T> {
+ fn decode<D: Decoder>(d: &mut D) -> Result<Cell<T>, D::Error> {
Ok(Cell::new(try!(Decodable::decode(d))))
}
}
// `encoder.error("attempting to Encode borrowed RefCell")`
// from `encode` when `try_borrow` returns `None`.
-impl<E, S: Encoder<E>, T: Encodable<S, E>> Encodable<S, E> for RefCell<T> {
- fn encode(&self, s: &mut S) -> Result<(), E> {
+impl<T: Encodable> Encodable for RefCell<T> {
+ fn encode<S: Encoder>(&self, s: &mut S) -> Result<(), S::Error> {
self.borrow().encode(s)
}
}
-impl<E, D: Decoder<E>, T: Decodable<D, E>> Decodable<D, E> for RefCell<T> {
- fn decode(d: &mut D) -> Result<RefCell<T>, E> {
+impl<T: Decodable> Decodable for RefCell<T> {
+ fn decode<D: Decoder>(d: &mut D) -> Result<RefCell<T>, D::Error> {
Ok(RefCell::new(try!(Decodable::decode(d))))
}
}
-impl<E, S:Encoder<E>, T:Encodable<S, E>> Encodable<S, E> for Arc<T> {
- fn encode(&self, s: &mut S) -> Result<(), E> {
+impl<T:Encodable> Encodable for Arc<T> {
+ fn encode<S: Encoder>(&self, s: &mut S) -> Result<(), S::Error> {
(**self).encode(s)
}
}
-impl<E, D:Decoder<E>,T:Decodable<D, E>+Send+Sync> Decodable<D, E> for Arc<T> {
- fn decode(d: &mut D) -> Result<Arc<T>, E> {
+impl<T:Decodable+Send+Sync> Decodable for Arc<T> {
+ fn decode<D: Decoder>(d: &mut D) -> Result<Arc<T>, D::Error> {
Ok(Arc::new(try!(Decodable::decode(d))))
}
}
// ___________________________________________________________________________
// Helper routines
-pub trait EncoderHelpers<E> {
- fn emit_from_vec<T, F>(&mut self, v: &[T], f: F) -> Result<(), E> where
- F: FnMut(&mut Self, &T) -> Result<(), E>;
+pub trait EncoderHelpers: Encoder {
+ fn emit_from_vec<T, F>(&mut self, v: &[T], f: F)
+ -> Result<(), <Self as Encoder>::Error>
+ where F: FnMut(&mut Self, &T) -> Result<(), <Self as Encoder>::Error>;
}
-impl<E, S:Encoder<E>> EncoderHelpers<E> for S {
- fn emit_from_vec<T, F>(&mut self, v: &[T], mut f: F) -> Result<(), E> where
- F: FnMut(&mut S, &T) -> Result<(), E>,
+impl<S:Encoder> EncoderHelpers for S {
+ fn emit_from_vec<T, F>(&mut self, v: &[T], mut f: F) -> Result<(), S::Error> where
+ F: FnMut(&mut S, &T) -> Result<(), S::Error>,
{
self.emit_seq(v.len(), |this| {
for (i, e) in v.iter().enumerate() {
}
}
-pub trait DecoderHelpers<E> {
- fn read_to_vec<T, F>(&mut self, f: F) -> Result<Vec<T>, E> where
- F: FnMut(&mut Self) -> Result<T, E>;
+pub trait DecoderHelpers: Decoder {
+ fn read_to_vec<T, F>(&mut self, f: F)
+ -> Result<Vec<T>, <Self as Decoder>::Error> where
+ F: FnMut(&mut Self) -> Result<T, <Self as Decoder>::Error>;
}
-impl<E, D:Decoder<E>> DecoderHelpers<E> for D {
- fn read_to_vec<T, F>(&mut self, mut f: F) -> Result<Vec<T>, E> where F:
- FnMut(&mut D) -> Result<T, E>,
+impl<D: Decoder> DecoderHelpers for D {
+ fn read_to_vec<T, F>(&mut self, mut f: F) -> Result<Vec<T>, D::Error> where F:
+ FnMut(&mut D) -> Result<T, D::Error>,
{
self.read_seq(|this, len| {
let mut v = Vec::with_capacity(len);
--- /dev/null
+// Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+//! Support code for encoding and decoding types.
+
+/*
+Core encoding and decoding interfaces.
+*/
+
+use std::path;
+use std::rc::Rc;
+use std::cell::{Cell, RefCell};
+use std::sync::Arc;
+
+pub trait Encoder<E> {
+ // Primitive types:
+ fn emit_nil(&mut self) -> Result<(), E>;
+ fn emit_uint(&mut self, v: uint) -> Result<(), E>;
+ fn emit_u64(&mut self, v: u64) -> Result<(), E>;
+ fn emit_u32(&mut self, v: u32) -> Result<(), E>;
+ fn emit_u16(&mut self, v: u16) -> Result<(), E>;
+ fn emit_u8(&mut self, v: u8) -> Result<(), E>;
+ fn emit_int(&mut self, v: int) -> Result<(), E>;
+ fn emit_i64(&mut self, v: i64) -> Result<(), E>;
+ fn emit_i32(&mut self, v: i32) -> Result<(), E>;
+ fn emit_i16(&mut self, v: i16) -> Result<(), E>;
+ fn emit_i8(&mut self, v: i8) -> Result<(), E>;
+ fn emit_bool(&mut self, v: bool) -> Result<(), E>;
+ fn emit_f64(&mut self, v: f64) -> Result<(), E>;
+ fn emit_f32(&mut self, v: f32) -> Result<(), E>;
+ fn emit_char(&mut self, v: char) -> Result<(), E>;
+ fn emit_str(&mut self, v: &str) -> Result<(), E>;
+
+ // Compound types:
+ fn emit_enum<F>(&mut self, name: &str, f: F) -> Result<(), E> where
+ F: FnOnce(&mut Self) -> Result<(), E>;
+
+ fn emit_enum_variant<F>(&mut self, v_name: &str,
+ v_id: uint,
+ len: uint,
+ f: F) -> Result<(), E> where
+ F: FnOnce(&mut Self) -> Result<(), E>;
+ fn emit_enum_variant_arg<F>(&mut self, a_idx: uint, f: F) -> Result<(), E> where
+ F: FnOnce(&mut Self) -> Result<(), E>;
+
+ fn emit_enum_struct_variant<F>(&mut self, v_name: &str,
+ v_id: uint,
+ len: uint,
+ f: F) -> Result<(), E> where
+ F: FnOnce(&mut Self) -> Result<(), E>;
+ fn emit_enum_struct_variant_field<F>(&mut self,
+ f_name: &str,
+ f_idx: uint,
+ f: F) -> Result<(), E> where
+ F: FnOnce(&mut Self) -> Result<(), E>;
+
+ fn emit_struct<F>(&mut self, name: &str, len: uint, f: F) -> Result<(), E> where
+ F: FnOnce(&mut Self) -> Result<(), E>;
+ fn emit_struct_field<F>(&mut self, f_name: &str, f_idx: uint, f: F) -> Result<(), E> where
+ F: FnOnce(&mut Self) -> Result<(), E>;
+
+ fn emit_tuple<F>(&mut self, len: uint, f: F) -> Result<(), E> where
+ F: FnOnce(&mut Self) -> Result<(), E>;
+ fn emit_tuple_arg<F>(&mut self, idx: uint, f: F) -> Result<(), E> where
+ F: FnOnce(&mut Self) -> Result<(), E>;
+
+ fn emit_tuple_struct<F>(&mut self, name: &str, len: uint, f: F) -> Result<(), E> where
+ F: FnOnce(&mut Self) -> Result<(), E>;
+ fn emit_tuple_struct_arg<F>(&mut self, f_idx: uint, f: F) -> Result<(), E> where
+ F: FnOnce(&mut Self) -> Result<(), E>;
+
+ // Specialized types:
+ fn emit_option<F>(&mut self, f: F) -> Result<(), E> where
+ F: FnOnce(&mut Self) -> Result<(), E>;
+ fn emit_option_none(&mut self) -> Result<(), E>;
+ fn emit_option_some<F>(&mut self, f: F) -> Result<(), E> where
+ F: FnOnce(&mut Self) -> Result<(), E>;
+
+ fn emit_seq<F>(&mut self, len: uint, f: F) -> Result<(), E> where
+ F: FnOnce(&mut Self) -> Result<(), E>;
+ fn emit_seq_elt<F>(&mut self, idx: uint, f: F) -> Result<(), E> where
+ F: FnOnce(&mut Self) -> Result<(), E>;
+
+ fn emit_map<F>(&mut self, len: uint, f: F) -> Result<(), E> where
+ F: FnOnce(&mut Self) -> Result<(), E>;
+ fn emit_map_elt_key<F>(&mut self, idx: uint, f: F) -> Result<(), E> where
+ F: FnMut(&mut Self) -> Result<(), E>;
+ fn emit_map_elt_val<F>(&mut self, idx: uint, f: F) -> Result<(), E> where
+ F: FnOnce(&mut Self) -> Result<(), E>;
+}
+
+pub trait Decoder<E> {
+ // Primitive types:
+ fn read_nil(&mut self) -> Result<(), E>;
+ fn read_uint(&mut self) -> Result<uint, E>;
+ fn read_u64(&mut self) -> Result<u64, E>;
+ fn read_u32(&mut self) -> Result<u32, E>;
+ fn read_u16(&mut self) -> Result<u16, E>;
+ fn read_u8(&mut self) -> Result<u8, E>;
+ fn read_int(&mut self) -> Result<int, E>;
+ fn read_i64(&mut self) -> Result<i64, E>;
+ fn read_i32(&mut self) -> Result<i32, E>;
+ fn read_i16(&mut self) -> Result<i16, E>;
+ fn read_i8(&mut self) -> Result<i8, E>;
+ fn read_bool(&mut self) -> Result<bool, E>;
+ fn read_f64(&mut self) -> Result<f64, E>;
+ fn read_f32(&mut self) -> Result<f32, E>;
+ fn read_char(&mut self) -> Result<char, E>;
+ fn read_str(&mut self) -> Result<String, E>;
+
+ // Compound types:
+ fn read_enum<T, F>(&mut self, name: &str, f: F) -> Result<T, E> where
+ F: FnOnce(&mut Self) -> Result<T, E>;
+
+ fn read_enum_variant<T, F>(&mut self, names: &[&str], f: F) -> Result<T, E> where
+ F: FnMut(&mut Self, uint) -> Result<T, E>;
+ fn read_enum_variant_arg<T, F>(&mut self, a_idx: uint, f: F) -> Result<T, E> where
+ F: FnOnce(&mut Self) -> Result<T, E>;
+
+ fn read_enum_struct_variant<T, F>(&mut self, names: &[&str], f: F) -> Result<T, E> where
+ F: FnMut(&mut Self, uint) -> Result<T, E>;
+ fn read_enum_struct_variant_field<T, F>(&mut self,
+ &f_name: &str,
+ f_idx: uint,
+ f: F)
+ -> Result<T, E> where
+ F: FnOnce(&mut Self) -> Result<T, E>;
+
+ fn read_struct<T, F>(&mut self, s_name: &str, len: uint, f: F) -> Result<T, E> where
+ F: FnOnce(&mut Self) -> Result<T, E>;
+ fn read_struct_field<T, F>(&mut self,
+ f_name: &str,
+ f_idx: uint,
+ f: F)
+ -> Result<T, E> where
+ F: FnOnce(&mut Self) -> Result<T, E>;
+
+ fn read_tuple<T, F>(&mut self, len: uint, f: F) -> Result<T, E> where
+ F: FnOnce(&mut Self) -> Result<T, E>;
+ fn read_tuple_arg<T, F>(&mut self, a_idx: uint, f: F) -> Result<T, E> where
+ F: FnOnce(&mut Self) -> Result<T, E>;
+
+ fn read_tuple_struct<T, F>(&mut self, s_name: &str, len: uint, f: F) -> Result<T, E> where
+ F: FnOnce(&mut Self) -> Result<T, E>;
+ fn read_tuple_struct_arg<T, F>(&mut self, a_idx: uint, f: F) -> Result<T, E> where
+ F: FnOnce(&mut Self) -> Result<T, E>;
+
+ // Specialized types:
+ fn read_option<T, F>(&mut self, f: F) -> Result<T, E> where
+ F: FnMut(&mut Self, bool) -> Result<T, E>;
+
+ fn read_seq<T, F>(&mut self, f: F) -> Result<T, E> where
+ F: FnOnce(&mut Self, uint) -> Result<T, E>;
+ fn read_seq_elt<T, F>(&mut self, idx: uint, f: F) -> Result<T, E> where
+ F: FnOnce(&mut Self) -> Result<T, E>;
+
+ fn read_map<T, F>(&mut self, f: F) -> Result<T, E> where
+ F: FnOnce(&mut Self, uint) -> Result<T, E>;
+ fn read_map_elt_key<T, F>(&mut self, idx: uint, f: F) -> Result<T, E> where
+ F: FnOnce(&mut Self) -> Result<T, E>;
+ fn read_map_elt_val<T, F>(&mut self, idx: uint, f: F) -> Result<T, E> where
+ F: FnOnce(&mut Self) -> Result<T, E>;
+
+ // Failure
+ fn error(&mut self, err: &str) -> E;
+}
+
+pub trait Encodable<S:Encoder<E>, E> for Sized? {
+ fn encode(&self, s: &mut S) -> Result<(), E>;
+}
+
+pub trait Decodable<D:Decoder<E>, E> {
+ fn decode(d: &mut D) -> Result<Self, E>;
+}
+
+impl<E, S:Encoder<E>> Encodable<S, E> for uint {
+ fn encode(&self, s: &mut S) -> Result<(), E> {
+ s.emit_uint(*self)
+ }
+}
+
+impl<E, D:Decoder<E>> Decodable<D, E> for uint {
+ fn decode(d: &mut D) -> Result<uint, E> {
+ d.read_uint()
+ }
+}
+
+impl<E, S:Encoder<E>> Encodable<S, E> for u8 {
+ fn encode(&self, s: &mut S) -> Result<(), E> {
+ s.emit_u8(*self)
+ }
+}
+
+impl<E, D:Decoder<E>> Decodable<D, E> for u8 {
+ fn decode(d: &mut D) -> Result<u8, E> {
+ d.read_u8()
+ }
+}
+
+impl<E, S:Encoder<E>> Encodable<S, E> for u16 {
+ fn encode(&self, s: &mut S) -> Result<(), E> {
+ s.emit_u16(*self)
+ }
+}
+
+impl<E, D:Decoder<E>> Decodable<D, E> for u16 {
+ fn decode(d: &mut D) -> Result<u16, E> {
+ d.read_u16()
+ }
+}
+
+impl<E, S:Encoder<E>> Encodable<S, E> for u32 {
+ fn encode(&self, s: &mut S) -> Result<(), E> {
+ s.emit_u32(*self)
+ }
+}
+
+impl<E, D:Decoder<E>> Decodable<D, E> for u32 {
+ fn decode(d: &mut D) -> Result<u32, E> {
+ d.read_u32()
+ }
+}
+
+impl<E, S:Encoder<E>> Encodable<S, E> for u64 {
+ fn encode(&self, s: &mut S) -> Result<(), E> {
+ s.emit_u64(*self)
+ }
+}
+
+impl<E, D:Decoder<E>> Decodable<D, E> for u64 {
+ fn decode(d: &mut D) -> Result<u64, E> {
+ d.read_u64()
+ }
+}
+
+impl<E, S:Encoder<E>> Encodable<S, E> for int {
+ fn encode(&self, s: &mut S) -> Result<(), E> {
+ s.emit_int(*self)
+ }
+}
+
+impl<E, D:Decoder<E>> Decodable<D, E> for int {
+ fn decode(d: &mut D) -> Result<int, E> {
+ d.read_int()
+ }
+}
+
+impl<E, S:Encoder<E>> Encodable<S, E> for i8 {
+ fn encode(&self, s: &mut S) -> Result<(), E> {
+ s.emit_i8(*self)
+ }
+}
+
+impl<E, D:Decoder<E>> Decodable<D, E> for i8 {
+ fn decode(d: &mut D) -> Result<i8, E> {
+ d.read_i8()
+ }
+}
+
+impl<E, S:Encoder<E>> Encodable<S, E> for i16 {
+ fn encode(&self, s: &mut S) -> Result<(), E> {
+ s.emit_i16(*self)
+ }
+}
+
+impl<E, D:Decoder<E>> Decodable<D, E> for i16 {
+ fn decode(d: &mut D) -> Result<i16, E> {
+ d.read_i16()
+ }
+}
+
+impl<E, S:Encoder<E>> Encodable<S, E> for i32 {
+ fn encode(&self, s: &mut S) -> Result<(), E> {
+ s.emit_i32(*self)
+ }
+}
+
+impl<E, D:Decoder<E>> Decodable<D, E> for i32 {
+ fn decode(d: &mut D) -> Result<i32, E> {
+ d.read_i32()
+ }
+}
+
+impl<E, S:Encoder<E>> Encodable<S, E> for i64 {
+ fn encode(&self, s: &mut S) -> Result<(), E> {
+ s.emit_i64(*self)
+ }
+}
+
+impl<E, D:Decoder<E>> Decodable<D, E> for i64 {
+ fn decode(d: &mut D) -> Result<i64, E> {
+ d.read_i64()
+ }
+}
+
+impl<E, S:Encoder<E>> Encodable<S, E> for str {
+ fn encode(&self, s: &mut S) -> Result<(), E> {
+ s.emit_str(self)
+ }
+}
+
+impl<E, S:Encoder<E>> Encodable<S, E> for String {
+ fn encode(&self, s: &mut S) -> Result<(), E> {
+ s.emit_str(self[])
+ }
+}
+
+impl<E, D:Decoder<E>> Decodable<D, E> for String {
+ fn decode(d: &mut D) -> Result<String, E> {
+ d.read_str()
+ }
+}
+
+impl<E, S:Encoder<E>> Encodable<S, E> for f32 {
+ fn encode(&self, s: &mut S) -> Result<(), E> {
+ s.emit_f32(*self)
+ }
+}
+
+impl<E, D:Decoder<E>> Decodable<D, E> for f32 {
+ fn decode(d: &mut D) -> Result<f32, E> {
+ d.read_f32()
+ }
+}
+
+impl<E, S:Encoder<E>> Encodable<S, E> for f64 {
+ fn encode(&self, s: &mut S) -> Result<(), E> {
+ s.emit_f64(*self)
+ }
+}
+
+impl<E, D:Decoder<E>> Decodable<D, E> for f64 {
+ fn decode(d: &mut D) -> Result<f64, E> {
+ d.read_f64()
+ }
+}
+
+impl<E, S:Encoder<E>> Encodable<S, E> for bool {
+ fn encode(&self, s: &mut S) -> Result<(), E> {
+ s.emit_bool(*self)
+ }
+}
+
+impl<E, D:Decoder<E>> Decodable<D, E> for bool {
+ fn decode(d: &mut D) -> Result<bool, E> {
+ d.read_bool()
+ }
+}
+
+impl<E, S:Encoder<E>> Encodable<S, E> for char {
+ fn encode(&self, s: &mut S) -> Result<(), E> {
+ s.emit_char(*self)
+ }
+}
+
+impl<E, D:Decoder<E>> Decodable<D, E> for char {
+ fn decode(d: &mut D) -> Result<char, E> {
+ d.read_char()
+ }
+}
+
+impl<E, S:Encoder<E>> Encodable<S, E> for () {
+ fn encode(&self, s: &mut S) -> Result<(), E> {
+ s.emit_nil()
+ }
+}
+
+impl<E, D:Decoder<E>> Decodable<D, E> for () {
+ fn decode(d: &mut D) -> Result<(), E> {
+ d.read_nil()
+ }
+}
+
+impl<'a, E, S: Encoder<E>, Sized? T: Encodable<S, E>> Encodable<S, E> for &'a T {
+ fn encode(&self, s: &mut S) -> Result<(), E> {
+ (**self).encode(s)
+ }
+}
+
+impl<E, S: Encoder<E>, Sized? T: Encodable<S, E>> Encodable<S, E> for Box<T> {
+ fn encode(&self, s: &mut S) -> Result<(), E> {
+ (**self).encode(s)
+ }
+}
+
+impl<E, D:Decoder<E>, T: Decodable<D, E>> Decodable<D, E> for Box<T> {
+ fn decode(d: &mut D) -> Result<Box<T>, E> {
+ Ok(box try!(Decodable::decode(d)))
+ }
+}
+
+impl<E, D:Decoder<E>, T: Decodable<D, E>> Decodable<D, E> for Box<[T]> {
+ fn decode(d: &mut D) -> Result<Box<[T]>, E> {
+ let v: Vec<T> = try!(Decodable::decode(d));
+ Ok(v.into_boxed_slice())
+ }
+}
+
+impl<E, S:Encoder<E>,T:Encodable<S, E>> Encodable<S, E> for Rc<T> {
+ #[inline]
+ fn encode(&self, s: &mut S) -> Result<(), E> {
+ (**self).encode(s)
+ }
+}
+
+impl<E, D:Decoder<E>,T:Decodable<D, E>> Decodable<D, E> for Rc<T> {
+ #[inline]
+ fn decode(d: &mut D) -> Result<Rc<T>, E> {
+ Ok(Rc::new(try!(Decodable::decode(d))))
+ }
+}
+
+impl<E, S:Encoder<E>,T:Encodable<S, E>> Encodable<S, E> for [T] {
+ fn encode(&self, s: &mut S) -> Result<(), E> {
+ s.emit_seq(self.len(), |s| {
+ for (i, e) in self.iter().enumerate() {
+ try!(s.emit_seq_elt(i, |s| e.encode(s)))
+ }
+ Ok(())
+ })
+ }
+}
+
+impl<E, S:Encoder<E>,T:Encodable<S, E>> Encodable<S, E> for Vec<T> {
+ fn encode(&self, s: &mut S) -> Result<(), E> {
+ s.emit_seq(self.len(), |s| {
+ for (i, e) in self.iter().enumerate() {
+ try!(s.emit_seq_elt(i, |s| e.encode(s)))
+ }
+ Ok(())
+ })
+ }
+}
+
+impl<E, D:Decoder<E>,T:Decodable<D, E>> Decodable<D, E> for Vec<T> {
+ fn decode(d: &mut D) -> Result<Vec<T>, E> {
+ d.read_seq(|d, len| {
+ let mut v = Vec::with_capacity(len);
+ for i in range(0, len) {
+ v.push(try!(d.read_seq_elt(i, |d| Decodable::decode(d))));
+ }
+ Ok(v)
+ })
+ }
+}
+
+impl<E, S:Encoder<E>,T:Encodable<S, E>> Encodable<S, E> for Option<T> {
+ fn encode(&self, s: &mut S) -> Result<(), E> {
+ s.emit_option(|s| {
+ match *self {
+ None => s.emit_option_none(),
+ Some(ref v) => s.emit_option_some(|s| v.encode(s)),
+ }
+ })
+ }
+}
+
+impl<E, D:Decoder<E>,T:Decodable<D, E>> Decodable<D, E> for Option<T> {
+ fn decode(d: &mut D) -> Result<Option<T>, E> {
+ d.read_option(|d, b| {
+ if b {
+ Ok(Some(try!(Decodable::decode(d))))
+ } else {
+ Ok(None)
+ }
+ })
+ }
+}
+
+macro_rules! peel {
+ ($name:ident, $($other:ident,)*) => (tuple! { $($other,)* })
+}
+
+/// Evaluates to the number of identifiers passed to it, for example: `count_idents!(a, b, c) == 3
+macro_rules! count_idents {
+ () => { 0u };
+ ($_i:ident $(, $rest:ident)*) => { 1 + count_idents!($($rest),*) }
+}
+
+macro_rules! tuple {
+ () => ();
+ ( $($name:ident,)+ ) => (
+ impl<E, D:Decoder<E>,$($name:Decodable<D, E>),*> Decodable<D,E> for ($($name,)*) {
+ #[allow(non_snake_case)]
+ fn decode(d: &mut D) -> Result<($($name,)*), E> {
+ let len: uint = count_idents!($($name),*);
+ d.read_tuple(len, |d| {
+ let mut i = 0;
+ let ret = ($(try!(d.read_tuple_arg({ i+=1; i-1 }, |d| -> Result<$name,E> {
+ Decodable::decode(d)
+ })),)*);
+ return Ok(ret);
+ })
+ }
+ }
+ impl<E, S:Encoder<E>,$($name:Encodable<S, E>),*> Encodable<S, E> for ($($name,)*) {
+ #[allow(non_snake_case)]
+ fn encode(&self, s: &mut S) -> Result<(), E> {
+ let ($(ref $name,)*) = *self;
+ let mut n = 0;
+ $(let $name = $name; n += 1;)*
+ s.emit_tuple(n, |s| {
+ let mut i = 0;
+ $(try!(s.emit_tuple_arg({ i+=1; i-1 }, |s| $name.encode(s)));)*
+ Ok(())
+ })
+ }
+ }
+ peel! { $($name,)* }
+ )
+}
+
+tuple! { T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, }
+
+impl<E, S: Encoder<E>> Encodable<S, E> for path::posix::Path {
+ fn encode(&self, e: &mut S) -> Result<(), E> {
+ self.as_vec().encode(e)
+ }
+}
+
+impl<E, D: Decoder<E>> Decodable<D, E> for path::posix::Path {
+ fn decode(d: &mut D) -> Result<path::posix::Path, E> {
+ let bytes: Vec<u8> = try!(Decodable::decode(d));
+ Ok(path::posix::Path::new(bytes))
+ }
+}
+
+impl<E, S: Encoder<E>> Encodable<S, E> for path::windows::Path {
+ fn encode(&self, e: &mut S) -> Result<(), E> {
+ self.as_vec().encode(e)
+ }
+}
+
+impl<E, D: Decoder<E>> Decodable<D, E> for path::windows::Path {
+ fn decode(d: &mut D) -> Result<path::windows::Path, E> {
+ let bytes: Vec<u8> = try!(Decodable::decode(d));
+ Ok(path::windows::Path::new(bytes))
+ }
+}
+
+impl<E, S: Encoder<E>, T: Encodable<S, E> + Copy> Encodable<S, E> for Cell<T> {
+ fn encode(&self, s: &mut S) -> Result<(), E> {
+ self.get().encode(s)
+ }
+}
+
+impl<E, D: Decoder<E>, T: Decodable<D, E> + Copy> Decodable<D, E> for Cell<T> {
+ fn decode(d: &mut D) -> Result<Cell<T>, E> {
+ Ok(Cell::new(try!(Decodable::decode(d))))
+ }
+}
+
+// FIXME: #15036
+// Should use `try_borrow`, returning a
+// `encoder.error("attempting to Encode borrowed RefCell")`
+// from `encode` when `try_borrow` returns `None`.
+
+impl<E, S: Encoder<E>, T: Encodable<S, E>> Encodable<S, E> for RefCell<T> {
+ fn encode(&self, s: &mut S) -> Result<(), E> {
+ self.borrow().encode(s)
+ }
+}
+
+impl<E, D: Decoder<E>, T: Decodable<D, E>> Decodable<D, E> for RefCell<T> {
+ fn decode(d: &mut D) -> Result<RefCell<T>, E> {
+ Ok(RefCell::new(try!(Decodable::decode(d))))
+ }
+}
+
+impl<E, S:Encoder<E>, T:Encodable<S, E>> Encodable<S, E> for Arc<T> {
+ fn encode(&self, s: &mut S) -> Result<(), E> {
+ (**self).encode(s)
+ }
+}
+
+impl<E, D:Decoder<E>,T:Decodable<D, E>+Send+Sync> Decodable<D, E> for Arc<T> {
+ fn decode(d: &mut D) -> Result<Arc<T>, E> {
+ Ok(Arc::new(try!(Decodable::decode(d))))
+ }
+}
+
+// ___________________________________________________________________________
+// Helper routines
+
+pub trait EncoderHelpers<E> {
+ fn emit_from_vec<T, F>(&mut self, v: &[T], f: F) -> Result<(), E> where
+ F: FnMut(&mut Self, &T) -> Result<(), E>;
+}
+
+impl<E, S:Encoder<E>> EncoderHelpers<E> for S {
+ fn emit_from_vec<T, F>(&mut self, v: &[T], mut f: F) -> Result<(), E> where
+ F: FnMut(&mut S, &T) -> Result<(), E>,
+ {
+ self.emit_seq(v.len(), |this| {
+ for (i, e) in v.iter().enumerate() {
+ try!(this.emit_seq_elt(i, |this| {
+ f(this, e)
+ }));
+ }
+ Ok(())
+ })
+ }
+}
+
+pub trait DecoderHelpers<E> {
+ fn read_to_vec<T, F>(&mut self, f: F) -> Result<Vec<T>, E> where
+ F: FnMut(&mut Self) -> Result<T, E>;
+}
+
+impl<E, D:Decoder<E>> DecoderHelpers<E> for D {
+ fn read_to_vec<T, F>(&mut self, mut f: F) -> Result<Vec<T>, E> where F:
+ FnMut(&mut D) -> Result<T, E>,
+ {
+ self.read_seq(|this, len| {
+ let mut v = Vec::with_capacity(len);
+ for i in range(0, len) {
+ v.push(try!(this.read_seq_elt(i, |this| f(this))));
+ }
+ Ok(v)
+ })
+ }
+}
projects / rust.git / commitdiff