+++ /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 std::ops::Index as IndexOp;
-
-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.index(&(start..i))));
- }
-
- try!(wr.write_str(escaped));
-
- start = i + 1;
- }
-
- if start != v.len() {
- try!(wr.write_str(v.index(&(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.index(&(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.index(&(..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.index(&FullRange)).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.index(&FullRange)).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.index(&FullRange)),
- _ => 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
- }
- }
-}
-
-impl<'a> ops::Index<&'a str> for Json {
- type Output = Json;
-
- fn index(&self, idx: & &str) -> &Json {
- self.find(*idx).unwrap()
- }
-}
-
-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.index(
- &((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.index(&(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.index(&FullRange)) {
- 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 {
- /// 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.index(&FullRange)).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.index(&FullRange)).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.index(&FullRange)).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()); });
- }
-}
+++ /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::ops::FullRange;
-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> {
- 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.index(&FullRange))
- }
-}
-
-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>, T: ?Sized + 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>, T: ?Sized + 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