1 // Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 // Rust JSON serialization library
12 // Copyright (c) 2011 Google Inc.
14 #![forbid(non_camel_case_types)]
15 #![allow(missing_docs)]
17 //! JSON parsing and serialization
21 //! JSON (JavaScript Object Notation) is a way to write data in Javascript.
22 //! Like XML, it allows to encode structured data in a text format that can be easily read by humans
23 //! Its simple syntax and native compatibility with JavaScript have made it a widely used format.
25 //! Data types that can be encoded are JavaScript types (see the `Json` enum for more details):
27 //! * `Boolean`: equivalent to rust's `bool`
28 //! * `Number`: equivalent to rust's `f64`
29 //! * `String`: equivalent to rust's `String`
30 //! * `Array`: equivalent to rust's `Vec<T>`, but also allowing objects of different types in the
32 //! * `Object`: equivalent to rust's `BTreeMap<String, json::Json>`
35 //! An object is a series of string keys mapping to values, in `"key": value` format.
36 //! Arrays are enclosed in square brackets ([ ... ]) and objects in curly brackets ({ ... }).
37 //! A simple JSON document encoding a person, their age, address and phone numbers could look like
41 //! "FirstName": "John",
42 //! "LastName": "Doe",
45 //! "Street": "Downing Street 10",
47 //! "Country": "Great Britain"
56 //! # Rust Type-based Encoding and Decoding
58 //! Rust provides a mechanism for low boilerplate encoding & decoding of values to and from JSON via
59 //! the serialization API.
60 //! To be able to encode a piece of data, it must implement the `serialize::RustcEncodable` trait.
61 //! To be able to decode a piece of data, it must implement the `serialize::RustcDecodable` trait.
62 //! The Rust compiler provides an annotation to automatically generate the code for these traits:
63 //! `#[derive(RustcDecodable, RustcEncodable)]`
65 //! The JSON API provides an enum `json::Json` and a trait `ToJson` to encode objects.
66 //! The `ToJson` trait provides a `to_json` method to convert an object into a `json::Json` value.
67 //! A `json::Json` value can be encoded as a string or buffer using the functions described above.
68 //! You can also use the `json::Encoder` object, which implements the `Encoder` trait.
70 //! When using `ToJson` the `RustcEncodable` trait implementation is not mandatory.
74 //! ## Using Autoserialization
76 //! Create a struct called `TestStruct` and serialize and deserialize it to and from JSON using the
77 //! serialization API, using the derived serialization code.
80 //! // FIXME(#19470): this cannot be ```rust``` because it fails orphan checking at the moment
81 //! extern crate serialize;
82 //! use serialize::json;
84 //! // Automatically generate `Decodable` and `Encodable` trait implementations
85 //! #[derive(RustcDecodable, RustcEncodable)]
86 //! pub struct TestStruct {
89 //! data_vector: Vec<u8>,
93 //! let object = TestStruct {
95 //! data_str: "homura".to_string(),
96 //! data_vector: vec![2,3,4,5],
99 //! // Serialize using `json::encode`
100 //! let encoded = json::encode(&object);
102 //! // Deserialize using `json::decode`
103 //! let decoded: TestStruct = json::decode(encoded.as_slice()).unwrap();
107 //! ## Using the `ToJson` trait
109 //! The examples above use the `ToJson` trait to generate the JSON string, which is required
110 //! for custom mappings.
112 //! ### Simple example of `ToJson` usage
115 //! // FIXME(#19470): this cannot be ```rust``` because it fails orphan checking at the moment
116 //! extern crate serialize;
117 //! use serialize::json::{self, ToJson, Json};
119 //! // A custom data structure
120 //! struct ComplexNum {
125 //! // JSON value representation
126 //! impl ToJson for ComplexNum {
127 //! fn to_json(&self) -> Json {
128 //! Json::String(format!("{}+{}i", self.a, self.b))
132 //! // Only generate `RustcEncodable` trait implementation
133 //! #[derive(Encodable)]
134 //! pub struct ComplexNumRecord {
141 //! let num = ComplexNum { a: 0.0001, b: 12.539 };
142 //! let data: String = json::encode(&ComplexNumRecord{
144 //! dsc: "test".to_string(),
145 //! val: num.to_json(),
147 //! println!("data: {}", data);
148 //! // data: {"uid":1,"dsc":"test","val":"0.0001+12.539j"};
152 //! ### Verbose example of `ToJson` usage
155 //! // FIXME(#19470): this cannot be ```rust``` because it fails orphan checking at the moment
156 //! extern crate serialize;
157 //! use std::collections::BTreeMap;
158 //! use serialize::json::{self, Json, ToJson};
160 //! // Only generate `Decodable` trait implementation
161 //! #[derive(Decodable)]
162 //! pub struct TestStruct {
164 //! data_str: String,
165 //! data_vector: Vec<u8>,
168 //! // Specify encoding method manually
169 //! impl ToJson for TestStruct {
170 //! fn to_json(&self) -> Json {
171 //! let mut d = BTreeMap::new();
172 //! // All standard types implement `to_json()`, so use it
173 //! d.insert("data_int".to_string(), self.data_int.to_json());
174 //! d.insert("data_str".to_string(), self.data_str.to_json());
175 //! d.insert("data_vector".to_string(), self.data_vector.to_json());
181 //! // Serialize using `ToJson`
182 //! let input_data = TestStruct {
184 //! data_str: "madoka".to_string(),
185 //! data_vector: vec![2,3,4,5],
187 //! let json_obj: Json = input_data.to_json();
188 //! let json_str: String = json_obj.to_string();
190 //! // Deserialize like before
191 //! let decoded: TestStruct = json::decode(json_str.as_slice()).unwrap();
195 use self::JsonEvent::*;
196 use self::ErrorCode::*;
197 use self::ParserError::*;
198 use self::DecoderError::*;
199 use self::ParserState::*;
200 use self::InternalStackElement::*;
203 use std::collections::{HashMap, BTreeMap};
204 use std::{char, f64, fmt, io, num, str};
205 use std::mem::{swap};
206 use std::num::{Float, Int};
207 use std::num::FpCategory as Fp;
208 use std::str::FromStr;
211 use unicode::str as unicode_str;
212 use unicode::str::Utf16Item;
216 /// Represents a json value
217 #[derive(Clone, PartialEq, PartialOrd, Show)]
222 String(string::String),
225 Object(self::Object),
229 pub type Array = Vec<Json>;
230 pub type Object = BTreeMap<string::String, Json>;
232 pub struct PrettyJson<'a> { inner: &'a Json }
234 pub struct AsJson<'a, T: 'a> { inner: &'a T }
235 pub struct AsPrettyJson<'a, T: 'a> { inner: &'a T, indent: Option<uint> }
237 /// The errors that can arise while parsing a JSON stream.
238 #[derive(Clone, Copy, PartialEq, Show)]
242 EOFWhileParsingObject,
243 EOFWhileParsingArray,
244 EOFWhileParsingValue,
245 EOFWhileParsingString,
251 InvalidUnicodeCodePoint,
252 LoneLeadingSurrogateInHexEscape,
253 UnexpectedEndOfHexEscape,
259 #[derive(Clone, Copy, PartialEq, Show)]
260 pub enum ParserError {
262 SyntaxError(ErrorCode, uint, uint),
263 IoError(io::IoErrorKind, &'static str),
266 // Builder and Parser have the same errors.
267 pub type BuilderError = ParserError;
269 #[derive(Clone, PartialEq, Show)]
270 pub enum DecoderError {
271 ParseError(ParserError),
272 ExpectedError(string::String, string::String),
273 MissingFieldError(string::String),
274 UnknownVariantError(string::String),
275 ApplicationError(string::String)
278 #[derive(Copy, Show)]
279 pub enum EncoderError {
280 FmtError(fmt::Error),
284 /// Returns a readable error string for a given error code.
285 pub fn error_str(error: ErrorCode) -> &'static str {
287 InvalidSyntax => "invalid syntax",
288 InvalidNumber => "invalid number",
289 EOFWhileParsingObject => "EOF While parsing object",
290 EOFWhileParsingArray => "EOF While parsing array",
291 EOFWhileParsingValue => "EOF While parsing value",
292 EOFWhileParsingString => "EOF While parsing string",
293 KeyMustBeAString => "key must be a string",
294 ExpectedColon => "expected `:`",
295 TrailingCharacters => "trailing characters",
296 TrailingComma => "trailing comma",
297 InvalidEscape => "invalid escape",
298 UnrecognizedHex => "invalid \\u{ esc}ape (unrecognized hex)",
299 NotFourDigit => "invalid \\u{ esc}ape (not four digits)",
300 NotUtf8 => "contents not utf-8",
301 InvalidUnicodeCodePoint => "invalid Unicode code point",
302 LoneLeadingSurrogateInHexEscape => "lone leading surrogate in hex escape",
303 UnexpectedEndOfHexEscape => "unexpected end of hex escape",
307 /// Shortcut function to decode a JSON `&str` into an object
308 pub fn decode<T: ::Decodable>(s: &str) -> DecodeResult<T> {
309 let json = match from_str(s) {
311 Err(e) => return Err(ParseError(e))
314 let mut decoder = Decoder::new(json);
315 ::Decodable::decode(&mut decoder)
318 /// Shortcut function to encode a `T` into a JSON `String`
319 pub fn encode<T: ::Encodable>(object: &T) -> string::String {
320 let mut s = String::new();
322 let mut encoder = Encoder::new(&mut s);
323 let _ = object.encode(&mut encoder);
328 impl fmt::Display for ErrorCode {
329 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
330 error_str(*self).fmt(f)
334 fn io_error_to_error(io: io::IoError) -> ParserError {
335 IoError(io.kind, io.desc)
338 impl fmt::Display for ParserError {
339 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
340 // FIXME this should be a nicer error
341 fmt::Debug::fmt(self, f)
345 impl fmt::Display for DecoderError {
346 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
347 // FIXME this should be a nicer error
348 fmt::Debug::fmt(self, f)
352 impl std::error::Error for DecoderError {
353 fn description(&self) -> &str { "decoder error" }
356 impl fmt::Display for EncoderError {
357 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
358 // FIXME this should be a nicer error
359 fmt::Debug::fmt(self, f)
363 impl std::error::Error for EncoderError {
364 fn description(&self) -> &str { "encoder error" }
367 impl std::error::FromError<fmt::Error> for EncoderError {
368 fn from_error(err: fmt::Error) -> EncoderError { EncoderError::FmtError(err) }
371 pub type EncodeResult = Result<(), EncoderError>;
372 pub type DecodeResult<T> = Result<T, DecoderError>;
374 fn escape_str(wr: &mut fmt::Writer, v: &str) -> EncodeResult {
375 try!(wr.write_str("\""));
379 for (i, byte) in v.bytes().enumerate() {
380 let escaped = match byte {
383 b'\x00' => "\\u0000",
384 b'\x01' => "\\u0001",
385 b'\x02' => "\\u0002",
386 b'\x03' => "\\u0003",
387 b'\x04' => "\\u0004",
388 b'\x05' => "\\u0005",
389 b'\x06' => "\\u0006",
390 b'\x07' => "\\u0007",
394 b'\x0b' => "\\u000b",
397 b'\x0e' => "\\u000e",
398 b'\x0f' => "\\u000f",
399 b'\x10' => "\\u0010",
400 b'\x11' => "\\u0011",
401 b'\x12' => "\\u0012",
402 b'\x13' => "\\u0013",
403 b'\x14' => "\\u0014",
404 b'\x15' => "\\u0015",
405 b'\x16' => "\\u0016",
406 b'\x17' => "\\u0017",
407 b'\x18' => "\\u0018",
408 b'\x19' => "\\u0019",
409 b'\x1a' => "\\u001a",
410 b'\x1b' => "\\u001b",
411 b'\x1c' => "\\u001c",
412 b'\x1d' => "\\u001d",
413 b'\x1e' => "\\u001e",
414 b'\x1f' => "\\u001f",
415 b'\x7f' => "\\u007f",
420 try!(wr.write_str(&v[start..i]));
423 try!(wr.write_str(escaped));
428 if start != v.len() {
429 try!(wr.write_str(&v[start..]));
432 try!(wr.write_str("\""));
436 fn escape_char(writer: &mut fmt::Writer, v: char) -> EncodeResult {
437 let mut buf = [0; 4];
438 let n = v.encode_utf8(&mut buf).unwrap();
439 let buf = unsafe { str::from_utf8_unchecked(&buf[..n]) };
440 escape_str(writer, buf)
443 fn spaces(wr: &mut fmt::Writer, mut n: uint) -> EncodeResult {
444 const BUF: &'static str = " ";
446 while n >= BUF.len() {
447 try!(wr.write_str(BUF));
452 try!(wr.write_str(&BUF[..n]));
457 fn fmt_number_or_null(v: f64) -> string::String {
459 Fp::Nan | Fp::Infinite => string::String::from_str("null"),
460 _ if v.fract() != 0f64 => f64::to_str_digits(v, 6u),
461 _ => f64::to_str_digits(v, 6u) + ".0",
465 /// A structure for implementing serialization to JSON.
466 pub struct Encoder<'a> {
467 writer: &'a mut (fmt::Writer+'a),
468 is_emitting_map_key: bool,
471 impl<'a> Encoder<'a> {
472 /// Creates a new JSON encoder whose output will be written to the writer
474 pub fn new(writer: &'a mut fmt::Writer) -> Encoder<'a> {
475 Encoder { writer: writer, is_emitting_map_key: false, }
479 macro_rules! emit_enquoted_if_mapkey {
480 ($enc:ident,$e:expr) => {
481 if $enc.is_emitting_map_key {
482 try!(write!($enc.writer, "\"{}\"", $e));
485 try!(write!($enc.writer, "{}", $e));
491 impl<'a> ::Encoder for Encoder<'a> {
492 type Error = EncoderError;
494 fn emit_nil(&mut self) -> EncodeResult {
495 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
496 try!(write!(self.writer, "null"));
500 fn emit_uint(&mut self, v: uint) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
501 fn emit_u64(&mut self, v: u64) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
502 fn emit_u32(&mut self, v: u32) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
503 fn emit_u16(&mut self, v: u16) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
504 fn emit_u8(&mut self, v: u8) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
506 fn emit_int(&mut self, v: int) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
507 fn emit_i64(&mut self, v: i64) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
508 fn emit_i32(&mut self, v: i32) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
509 fn emit_i16(&mut self, v: i16) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
510 fn emit_i8(&mut self, v: i8) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
512 fn emit_bool(&mut self, v: bool) -> EncodeResult {
513 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
515 try!(write!(self.writer, "true"));
517 try!(write!(self.writer, "false"));
522 fn emit_f64(&mut self, v: f64) -> EncodeResult {
523 emit_enquoted_if_mapkey!(self, fmt_number_or_null(v))
525 fn emit_f32(&mut self, v: f32) -> EncodeResult {
526 self.emit_f64(v as f64)
529 fn emit_char(&mut self, v: char) -> EncodeResult {
530 escape_char(self.writer, v)
532 fn emit_str(&mut self, v: &str) -> EncodeResult {
533 escape_str(self.writer, v)
536 fn emit_enum<F>(&mut self, _name: &str, f: F) -> EncodeResult where
537 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
539 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
543 fn emit_enum_variant<F>(&mut self,
547 f: F) -> EncodeResult where
548 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
550 // enums are encoded as strings or objects
552 // Kangaroo(34,"William") => {"variant": "Kangaroo", "fields": [34,"William"]}
553 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
555 escape_str(self.writer, name)
557 try!(write!(self.writer, "{{\"variant\":"));
558 try!(escape_str(self.writer, name));
559 try!(write!(self.writer, ",\"fields\":["));
561 try!(write!(self.writer, "]}}"));
566 fn emit_enum_variant_arg<F>(&mut self, idx: uint, f: F) -> EncodeResult where
567 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
569 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
571 try!(write!(self.writer, ","));
576 fn emit_enum_struct_variant<F>(&mut self,
580 f: F) -> EncodeResult where
581 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
583 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
584 self.emit_enum_variant(name, id, cnt, f)
587 fn emit_enum_struct_variant_field<F>(&mut self,
590 f: F) -> EncodeResult where
591 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
593 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
594 self.emit_enum_variant_arg(idx, f)
597 fn emit_struct<F>(&mut self, _: &str, _: uint, f: F) -> EncodeResult where
598 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
600 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
601 try!(write!(self.writer, "{{"));
603 try!(write!(self.writer, "}}"));
607 fn emit_struct_field<F>(&mut self, name: &str, idx: uint, f: F) -> EncodeResult where
608 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
610 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
611 if idx != 0 { try!(write!(self.writer, ",")); }
612 try!(escape_str(self.writer, name));
613 try!(write!(self.writer, ":"));
617 fn emit_tuple<F>(&mut self, len: uint, f: F) -> EncodeResult where
618 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
620 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
621 self.emit_seq(len, f)
623 fn emit_tuple_arg<F>(&mut self, idx: uint, f: F) -> EncodeResult where
624 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
626 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
627 self.emit_seq_elt(idx, f)
630 fn emit_tuple_struct<F>(&mut self, _name: &str, len: uint, f: F) -> EncodeResult where
631 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
633 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
634 self.emit_seq(len, f)
636 fn emit_tuple_struct_arg<F>(&mut self, idx: uint, f: F) -> EncodeResult where
637 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
639 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
640 self.emit_seq_elt(idx, f)
643 fn emit_option<F>(&mut self, f: F) -> EncodeResult where
644 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
646 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
649 fn emit_option_none(&mut self) -> EncodeResult {
650 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
653 fn emit_option_some<F>(&mut self, f: F) -> EncodeResult where
654 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
656 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
660 fn emit_seq<F>(&mut self, _len: uint, f: F) -> EncodeResult where
661 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
663 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
664 try!(write!(self.writer, "["));
666 try!(write!(self.writer, "]"));
670 fn emit_seq_elt<F>(&mut self, idx: uint, f: F) -> EncodeResult where
671 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
673 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
675 try!(write!(self.writer, ","));
680 fn emit_map<F>(&mut self, _len: uint, f: F) -> EncodeResult where
681 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
683 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
684 try!(write!(self.writer, "{{"));
686 try!(write!(self.writer, "}}"));
690 fn emit_map_elt_key<F>(&mut self, idx: uint, f: F) -> EncodeResult where
691 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
693 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
694 if idx != 0 { try!(write!(self.writer, ",")) }
695 self.is_emitting_map_key = true;
697 self.is_emitting_map_key = false;
701 fn emit_map_elt_val<F>(&mut self, _idx: uint, f: F) -> EncodeResult where
702 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
704 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
705 try!(write!(self.writer, ":"));
710 /// Another encoder for JSON, but prints out human-readable JSON instead of
712 pub struct PrettyEncoder<'a> {
713 writer: &'a mut (fmt::Writer+'a),
716 is_emitting_map_key: bool,
719 impl<'a> PrettyEncoder<'a> {
720 /// Creates a new encoder whose output will be written to the specified writer
721 pub fn new(writer: &'a mut fmt::Writer) -> PrettyEncoder<'a> {
726 is_emitting_map_key: false,
730 /// Set the number of spaces to indent for each level.
731 /// This is safe to set during encoding.
732 pub fn set_indent(&mut self, indent: uint) {
733 // self.indent very well could be 0 so we need to use checked division.
734 let level = self.curr_indent.checked_div(self.indent).unwrap_or(0);
735 self.indent = indent;
736 self.curr_indent = level * self.indent;
740 impl<'a> ::Encoder for PrettyEncoder<'a> {
741 type Error = EncoderError;
743 fn emit_nil(&mut self) -> EncodeResult {
744 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
745 try!(write!(self.writer, "null"));
749 fn emit_uint(&mut self, v: uint) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
750 fn emit_u64(&mut self, v: u64) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
751 fn emit_u32(&mut self, v: u32) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
752 fn emit_u16(&mut self, v: u16) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
753 fn emit_u8(&mut self, v: u8) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
755 fn emit_int(&mut self, v: int) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
756 fn emit_i64(&mut self, v: i64) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
757 fn emit_i32(&mut self, v: i32) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
758 fn emit_i16(&mut self, v: i16) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
759 fn emit_i8(&mut self, v: i8) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
761 fn emit_bool(&mut self, v: bool) -> EncodeResult {
762 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
764 try!(write!(self.writer, "true"));
766 try!(write!(self.writer, "false"));
771 fn emit_f64(&mut self, v: f64) -> EncodeResult {
772 emit_enquoted_if_mapkey!(self, fmt_number_or_null(v))
774 fn emit_f32(&mut self, v: f32) -> EncodeResult {
775 self.emit_f64(v as f64)
778 fn emit_char(&mut self, v: char) -> EncodeResult {
779 escape_char(self.writer, v)
781 fn emit_str(&mut self, v: &str) -> EncodeResult {
782 escape_str(self.writer, v)
785 fn emit_enum<F>(&mut self, _name: &str, f: F) -> EncodeResult where
786 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
788 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
792 fn emit_enum_variant<F>(&mut self,
797 -> EncodeResult where
798 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
800 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
802 escape_str(self.writer, name)
804 try!(write!(self.writer, "{{\n"));
805 self.curr_indent += self.indent;
806 try!(spaces(self.writer, self.curr_indent));
807 try!(write!(self.writer, "\"variant\": "));
808 try!(escape_str(self.writer, name));
809 try!(write!(self.writer, ",\n"));
810 try!(spaces(self.writer, self.curr_indent));
811 try!(write!(self.writer, "\"fields\": [\n"));
812 self.curr_indent += self.indent;
814 self.curr_indent -= self.indent;
815 try!(write!(self.writer, "\n"));
816 try!(spaces(self.writer, self.curr_indent));
817 self.curr_indent -= self.indent;
818 try!(write!(self.writer, "]\n"));
819 try!(spaces(self.writer, self.curr_indent));
820 try!(write!(self.writer, "}}"));
825 fn emit_enum_variant_arg<F>(&mut self, idx: uint, f: F) -> EncodeResult where
826 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
828 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
830 try!(write!(self.writer, ",\n"));
832 try!(spaces(self.writer, self.curr_indent));
836 fn emit_enum_struct_variant<F>(&mut self,
840 f: F) -> EncodeResult where
841 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
843 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
844 self.emit_enum_variant(name, id, cnt, f)
847 fn emit_enum_struct_variant_field<F>(&mut self,
850 f: F) -> EncodeResult where
851 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
853 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
854 self.emit_enum_variant_arg(idx, f)
858 fn emit_struct<F>(&mut self, _: &str, len: uint, f: F) -> EncodeResult where
859 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
861 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
863 try!(write!(self.writer, "{{}}"));
865 try!(write!(self.writer, "{{"));
866 self.curr_indent += self.indent;
868 self.curr_indent -= self.indent;
869 try!(write!(self.writer, "\n"));
870 try!(spaces(self.writer, self.curr_indent));
871 try!(write!(self.writer, "}}"));
876 fn emit_struct_field<F>(&mut self, name: &str, idx: uint, f: F) -> EncodeResult where
877 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
879 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
881 try!(write!(self.writer, "\n"));
883 try!(write!(self.writer, ",\n"));
885 try!(spaces(self.writer, self.curr_indent));
886 try!(escape_str(self.writer, name));
887 try!(write!(self.writer, ": "));
891 fn emit_tuple<F>(&mut self, len: uint, f: F) -> EncodeResult where
892 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
894 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
895 self.emit_seq(len, f)
897 fn emit_tuple_arg<F>(&mut self, idx: uint, f: F) -> EncodeResult where
898 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
900 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
901 self.emit_seq_elt(idx, f)
904 fn emit_tuple_struct<F>(&mut self, _: &str, len: uint, f: F) -> EncodeResult where
905 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
907 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
908 self.emit_seq(len, f)
910 fn emit_tuple_struct_arg<F>(&mut self, idx: uint, f: F) -> EncodeResult where
911 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
913 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
914 self.emit_seq_elt(idx, f)
917 fn emit_option<F>(&mut self, f: F) -> EncodeResult where
918 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
920 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
923 fn emit_option_none(&mut self) -> EncodeResult {
924 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
927 fn emit_option_some<F>(&mut self, f: F) -> EncodeResult where
928 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
930 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
934 fn emit_seq<F>(&mut self, len: uint, f: F) -> EncodeResult where
935 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
937 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
939 try!(write!(self.writer, "[]"));
941 try!(write!(self.writer, "["));
942 self.curr_indent += self.indent;
944 self.curr_indent -= self.indent;
945 try!(write!(self.writer, "\n"));
946 try!(spaces(self.writer, self.curr_indent));
947 try!(write!(self.writer, "]"));
952 fn emit_seq_elt<F>(&mut self, idx: uint, f: F) -> EncodeResult where
953 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
955 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
957 try!(write!(self.writer, "\n"));
959 try!(write!(self.writer, ",\n"));
961 try!(spaces(self.writer, self.curr_indent));
965 fn emit_map<F>(&mut self, len: uint, f: F) -> EncodeResult where
966 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
968 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
970 try!(write!(self.writer, "{{}}"));
972 try!(write!(self.writer, "{{"));
973 self.curr_indent += self.indent;
975 self.curr_indent -= self.indent;
976 try!(write!(self.writer, "\n"));
977 try!(spaces(self.writer, self.curr_indent));
978 try!(write!(self.writer, "}}"));
983 fn emit_map_elt_key<F>(&mut self, idx: uint, f: F) -> EncodeResult where
984 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
986 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
988 try!(write!(self.writer, "\n"));
990 try!(write!(self.writer, ",\n"));
992 try!(spaces(self.writer, self.curr_indent));
993 self.is_emitting_map_key = true;
995 self.is_emitting_map_key = false;
999 fn emit_map_elt_val<F>(&mut self, _idx: uint, f: F) -> EncodeResult where
1000 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
1002 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
1003 try!(write!(self.writer, ": "));
1008 impl Encodable for Json {
1009 fn encode<E: ::Encoder>(&self, e: &mut E) -> Result<(), E::Error> {
1011 Json::I64(v) => v.encode(e),
1012 Json::U64(v) => v.encode(e),
1013 Json::F64(v) => v.encode(e),
1014 Json::String(ref v) => v.encode(e),
1015 Json::Boolean(v) => v.encode(e),
1016 Json::Array(ref v) => v.encode(e),
1017 Json::Object(ref v) => v.encode(e),
1018 Json::Null => e.emit_nil(),
1023 /// Create an `AsJson` wrapper which can be used to print a value as JSON
1024 /// on-the-fly via `write!`
1025 pub fn as_json<T>(t: &T) -> AsJson<T> {
1029 /// Create an `AsPrettyJson` wrapper which can be used to print a value as JSON
1030 /// on-the-fly via `write!`
1031 pub fn as_pretty_json<T>(t: &T) -> AsPrettyJson<T> {
1032 AsPrettyJson { inner: t, indent: None }
1036 /// Borrow this json object as a pretty object to generate a pretty
1037 /// representation for it via `Show`.
1038 pub fn pretty(&self) -> PrettyJson {
1039 PrettyJson { inner: self }
1042 /// If the Json value is an Object, returns the value associated with the provided key.
1043 /// Otherwise, returns None.
1044 pub fn find<'a>(&'a self, key: &str) -> Option<&'a Json>{
1046 &Json::Object(ref map) => map.get(key),
1051 /// Attempts to get a nested Json Object for each key in `keys`.
1052 /// If any key is found not to exist, find_path will return None.
1053 /// Otherwise, it will return the Json value associated with the final key.
1054 pub fn find_path<'a>(&'a self, keys: &[&str]) -> Option<&'a Json>{
1055 let mut target = self;
1056 for key in keys.iter() {
1057 match target.find(*key) {
1058 Some(t) => { target = t; },
1065 /// If the Json value is an Object, performs a depth-first search until
1066 /// a value associated with the provided key is found. If no value is found
1067 /// or the Json value is not an Object, returns None.
1068 pub fn search<'a>(&'a self, key: &str) -> Option<&'a Json> {
1070 &Json::Object(ref map) => {
1071 match map.get(key) {
1072 Some(json_value) => Some(json_value),
1074 for (_, v) in map.iter() {
1075 match v.search(key) {
1076 x if x.is_some() => return x,
1088 /// Returns true if the Json value is an Object. Returns false otherwise.
1089 pub fn is_object<'a>(&'a self) -> bool {
1090 self.as_object().is_some()
1093 /// If the Json value is an Object, returns the associated BTreeMap.
1094 /// Returns None otherwise.
1095 pub fn as_object<'a>(&'a self) -> Option<&'a Object> {
1097 &Json::Object(ref map) => Some(map),
1102 /// Returns true if the Json value is an Array. Returns false otherwise.
1103 pub fn is_array<'a>(&'a self) -> bool {
1104 self.as_array().is_some()
1107 /// If the Json value is an Array, returns the associated vector.
1108 /// Returns None otherwise.
1109 pub fn as_array<'a>(&'a self) -> Option<&'a Array> {
1111 &Json::Array(ref array) => Some(&*array),
1116 /// Returns true if the Json value is a String. Returns false otherwise.
1117 pub fn is_string<'a>(&'a self) -> bool {
1118 self.as_string().is_some()
1121 /// If the Json value is a String, returns the associated str.
1122 /// Returns None otherwise.
1123 pub fn as_string<'a>(&'a self) -> Option<&'a str> {
1125 Json::String(ref s) => Some(&s[]),
1130 /// Returns true if the Json value is a Number. Returns false otherwise.
1131 pub fn is_number(&self) -> bool {
1133 Json::I64(_) | Json::U64(_) | Json::F64(_) => true,
1138 /// Returns true if the Json value is a i64. Returns false otherwise.
1139 pub fn is_i64(&self) -> bool {
1141 Json::I64(_) => true,
1146 /// Returns true if the Json value is a u64. Returns false otherwise.
1147 pub fn is_u64(&self) -> bool {
1149 Json::U64(_) => true,
1154 /// Returns true if the Json value is a f64. Returns false otherwise.
1155 pub fn is_f64(&self) -> bool {
1157 Json::F64(_) => true,
1162 /// If the Json value is a number, return or cast it to a i64.
1163 /// Returns None otherwise.
1164 pub fn as_i64(&self) -> Option<i64> {
1166 Json::I64(n) => Some(n),
1167 Json::U64(n) => num::cast(n),
1172 /// If the Json value is a number, return or cast it to a u64.
1173 /// Returns None otherwise.
1174 pub fn as_u64(&self) -> Option<u64> {
1176 Json::I64(n) => num::cast(n),
1177 Json::U64(n) => Some(n),
1182 /// If the Json value is a number, return or cast it to a f64.
1183 /// Returns None otherwise.
1184 pub fn as_f64(&self) -> Option<f64> {
1186 Json::I64(n) => num::cast(n),
1187 Json::U64(n) => num::cast(n),
1188 Json::F64(n) => Some(n),
1193 /// Returns true if the Json value is a Boolean. Returns false otherwise.
1194 pub fn is_boolean(&self) -> bool {
1195 self.as_boolean().is_some()
1198 /// If the Json value is a Boolean, returns the associated bool.
1199 /// Returns None otherwise.
1200 pub fn as_boolean(&self) -> Option<bool> {
1202 &Json::Boolean(b) => Some(b),
1207 /// Returns true if the Json value is a Null. Returns false otherwise.
1208 pub fn is_null(&self) -> bool {
1209 self.as_null().is_some()
1212 /// If the Json value is a Null, returns ().
1213 /// Returns None otherwise.
1214 pub fn as_null(&self) -> Option<()> {
1216 &Json::Null => Some(()),
1222 impl<'a> Index<&'a str> for Json {
1225 fn index(&self, idx: & &str) -> &Json {
1226 self.find(*idx).unwrap()
1230 impl Index<uint> for Json {
1233 fn index<'a>(&'a self, idx: &uint) -> &'a Json {
1235 &Json::Array(ref v) => &v[*idx],
1236 _ => panic!("can only index Json with uint if it is an array")
1241 /// The output of the streaming parser.
1242 #[derive(PartialEq, Clone, Show)]
1243 pub enum JsonEvent {
1252 StringValue(string::String),
1257 #[derive(PartialEq, Show)]
1259 // Parse a value in an array, true means first element.
1261 // Parse ',' or ']' after an element in an array.
1263 // Parse a key:value in an object, true means first element.
1265 // Parse ',' or ']' after an element in an object.
1269 // Expecting the stream to end.
1271 // Parsing can't continue.
1275 /// A Stack represents the current position of the parser in the logical
1276 /// structure of the JSON stream.
1277 /// For example foo.bar[3].x
1279 stack: Vec<InternalStackElement>,
1280 str_buffer: Vec<u8>,
1283 /// StackElements compose a Stack.
1284 /// For example, StackElement::Key("foo"), StackElement::Key("bar"),
1285 /// StackElement::Index(3) and StackElement::Key("x") are the
1286 /// StackElements compositing the stack that represents foo.bar[3].x
1287 #[derive(PartialEq, Clone, Show)]
1288 pub enum StackElement<'l> {
1293 // Internally, Key elements are stored as indices in a buffer to avoid
1294 // allocating a string for every member of an object.
1295 #[derive(PartialEq, Clone, Show)]
1296 enum InternalStackElement {
1298 InternalKey(u16, u16), // start, size
1302 pub fn new() -> Stack {
1303 Stack { stack: Vec::new(), str_buffer: Vec::new() }
1306 /// Returns The number of elements in the Stack.
1307 pub fn len(&self) -> uint { self.stack.len() }
1309 /// Returns true if the stack is empty.
1310 pub fn is_empty(&self) -> bool { self.stack.is_empty() }
1312 /// Provides access to the StackElement at a given index.
1313 /// lower indices are at the bottom of the stack while higher indices are
1315 pub fn get<'l>(&'l self, idx: uint) -> StackElement<'l> {
1316 match self.stack[idx] {
1317 InternalIndex(i) => StackElement::Index(i),
1318 InternalKey(start, size) => {
1319 StackElement::Key(str::from_utf8(
1320 &self.str_buffer[start as uint .. start as uint + size as uint])
1326 /// Compares this stack with an array of StackElements.
1327 pub fn is_equal_to(&self, rhs: &[StackElement]) -> bool {
1328 if self.stack.len() != rhs.len() { return false; }
1329 for i in range(0, rhs.len()) {
1330 if self.get(i) != rhs[i] { return false; }
1335 /// Returns true if the bottom-most elements of this stack are the same as
1336 /// the ones passed as parameter.
1337 pub fn starts_with(&self, rhs: &[StackElement]) -> bool {
1338 if self.stack.len() < rhs.len() { return false; }
1339 for i in range(0, rhs.len()) {
1340 if self.get(i) != rhs[i] { return false; }
1345 /// Returns true if the top-most elements of this stack are the same as
1346 /// the ones passed as parameter.
1347 pub fn ends_with(&self, rhs: &[StackElement]) -> bool {
1348 if self.stack.len() < rhs.len() { return false; }
1349 let offset = self.stack.len() - rhs.len();
1350 for i in range(0, rhs.len()) {
1351 if self.get(i + offset) != rhs[i] { return false; }
1356 /// Returns the top-most element (if any).
1357 pub fn top<'l>(&'l self) -> Option<StackElement<'l>> {
1358 return match self.stack.last() {
1360 Some(&InternalIndex(i)) => Some(StackElement::Index(i)),
1361 Some(&InternalKey(start, size)) => {
1362 Some(StackElement::Key(str::from_utf8(
1363 &self.str_buffer[start as uint .. (start+size) as uint]
1369 // Used by Parser to insert StackElement::Key elements at the top of the stack.
1370 fn push_key(&mut self, key: string::String) {
1371 self.stack.push(InternalKey(self.str_buffer.len() as u16, key.len() as u16));
1372 for c in key.as_bytes().iter() {
1373 self.str_buffer.push(*c);
1377 // Used by Parser to insert StackElement::Index elements at the top of the stack.
1378 fn push_index(&mut self, index: u32) {
1379 self.stack.push(InternalIndex(index));
1382 // Used by Parser to remove the top-most element of the stack.
1384 assert!(!self.is_empty());
1385 match *self.stack.last().unwrap() {
1386 InternalKey(_, sz) => {
1387 let new_size = self.str_buffer.len() - sz as uint;
1388 self.str_buffer.truncate(new_size);
1390 InternalIndex(_) => {}
1395 // Used by Parser to test whether the top-most element is an index.
1396 fn last_is_index(&self) -> bool {
1397 if self.is_empty() { return false; }
1398 return match *self.stack.last().unwrap() {
1399 InternalIndex(_) => true,
1404 // Used by Parser to increment the index of the top-most element.
1405 fn bump_index(&mut self) {
1406 let len = self.stack.len();
1407 let idx = match *self.stack.last().unwrap() {
1408 InternalIndex(i) => { i + 1 }
1411 self.stack[len - 1] = InternalIndex(idx);
1415 /// A streaming JSON parser implemented as an iterator of JsonEvent, consuming
1416 /// an iterator of char.
1417 pub struct Parser<T> {
1422 // We maintain a stack representing where we are in the logical structure
1423 // of the JSON stream.
1425 // A state machine is kept to make it possible to interrupt and resume parsing.
1429 impl<T: Iterator<Item=char>> Iterator for Parser<T> {
1430 type Item = JsonEvent;
1432 fn next(&mut self) -> Option<JsonEvent> {
1433 if self.state == ParseFinished {
1437 if self.state == ParseBeforeFinish {
1438 self.parse_whitespace();
1439 // Make sure there is no trailing characters.
1441 self.state = ParseFinished;
1444 return Some(self.error_event(TrailingCharacters));
1448 return Some(self.parse());
1452 impl<T: Iterator<Item=char>> Parser<T> {
1453 /// Creates the JSON parser.
1454 pub fn new(rdr: T) -> Parser<T> {
1455 let mut p = Parser {
1460 stack: Stack::new(),
1467 /// Provides access to the current position in the logical structure of the
1469 pub fn stack<'l>(&'l self) -> &'l Stack {
1473 fn eof(&self) -> bool { self.ch.is_none() }
1474 fn ch_or_null(&self) -> char { self.ch.unwrap_or('\x00') }
1475 fn bump(&mut self) {
1476 self.ch = self.rdr.next();
1478 if self.ch_is('\n') {
1486 fn next_char(&mut self) -> Option<char> {
1490 fn ch_is(&self, c: char) -> bool {
1494 fn error<U>(&self, reason: ErrorCode) -> Result<U, ParserError> {
1495 Err(SyntaxError(reason, self.line, self.col))
1498 fn parse_whitespace(&mut self) {
1499 while self.ch_is(' ') ||
1502 self.ch_is('\r') { self.bump(); }
1505 fn parse_number(&mut self) -> JsonEvent {
1506 let mut neg = false;
1508 if self.ch_is('-') {
1513 let res = match self.parse_u64() {
1515 Err(e) => { return Error(e); }
1518 if self.ch_is('.') || self.ch_is('e') || self.ch_is('E') {
1519 let mut res = res as f64;
1521 if self.ch_is('.') {
1522 res = match self.parse_decimal(res) {
1524 Err(e) => { return Error(e); }
1528 if self.ch_is('e') || self.ch_is('E') {
1529 res = match self.parse_exponent(res) {
1531 Err(e) => { return Error(e); }
1542 let res = -(res as i64);
1544 // Make sure we didn't underflow.
1546 Error(SyntaxError(InvalidNumber, self.line, self.col))
1556 fn parse_u64(&mut self) -> Result<u64, ParserError> {
1558 let last_accum = 0; // necessary to detect overflow.
1560 match self.ch_or_null() {
1564 // A leading '0' must be the only digit before the decimal point.
1565 match self.ch_or_null() {
1566 '0' ... '9' => return self.error(InvalidNumber),
1572 match self.ch_or_null() {
1573 c @ '0' ... '9' => {
1575 accum += (c as u64) - ('0' as u64);
1577 // Detect overflow by comparing to the last value.
1578 if accum <= last_accum { return self.error(InvalidNumber); }
1586 _ => return self.error(InvalidNumber),
1592 fn parse_decimal(&mut self, mut res: f64) -> Result<f64, ParserError> {
1595 // Make sure a digit follows the decimal place.
1596 match self.ch_or_null() {
1598 _ => return self.error(InvalidNumber)
1603 match self.ch_or_null() {
1604 c @ '0' ... '9' => {
1606 res += (((c as int) - ('0' as int)) as f64) * dec;
1616 fn parse_exponent(&mut self, mut res: f64) -> Result<f64, ParserError> {
1620 let mut neg_exp = false;
1622 if self.ch_is('+') {
1624 } else if self.ch_is('-') {
1629 // Make sure a digit follows the exponent place.
1630 match self.ch_or_null() {
1632 _ => return self.error(InvalidNumber)
1635 match self.ch_or_null() {
1636 c @ '0' ... '9' => {
1638 exp += (c as uint) - ('0' as uint);
1646 let exp = 10_f64.powi(exp as i32);
1656 fn decode_hex_escape(&mut self) -> Result<u16, ParserError> {
1659 while i < 4 && !self.eof() {
1661 n = match self.ch_or_null() {
1662 c @ '0' ... '9' => n * 16 + ((c as u16) - ('0' as u16)),
1663 'a' | 'A' => n * 16 + 10,
1664 'b' | 'B' => n * 16 + 11,
1665 'c' | 'C' => n * 16 + 12,
1666 'd' | 'D' => n * 16 + 13,
1667 'e' | 'E' => n * 16 + 14,
1668 'f' | 'F' => n * 16 + 15,
1669 _ => return self.error(InvalidEscape)
1675 // Error out if we didn't parse 4 digits.
1677 return self.error(InvalidEscape);
1683 fn parse_str(&mut self) -> Result<string::String, ParserError> {
1684 let mut escape = false;
1685 let mut res = string::String::new();
1690 return self.error(EOFWhileParsingString);
1694 match self.ch_or_null() {
1695 '"' => res.push('"'),
1696 '\\' => res.push('\\'),
1697 '/' => res.push('/'),
1698 'b' => res.push('\x08'),
1699 'f' => res.push('\x0c'),
1700 'n' => res.push('\n'),
1701 'r' => res.push('\r'),
1702 't' => res.push('\t'),
1703 'u' => match try!(self.decode_hex_escape()) {
1704 0xDC00 ... 0xDFFF => {
1705 return self.error(LoneLeadingSurrogateInHexEscape)
1708 // Non-BMP characters are encoded as a sequence of
1709 // two hex escapes, representing UTF-16 surrogates.
1710 n1 @ 0xD800 ... 0xDBFF => {
1711 match (self.next_char(), self.next_char()) {
1712 (Some('\\'), Some('u')) => (),
1713 _ => return self.error(UnexpectedEndOfHexEscape),
1716 let buf = [n1, try!(self.decode_hex_escape())];
1717 match unicode_str::utf16_items(&buf).next() {
1718 Some(Utf16Item::ScalarValue(c)) => res.push(c),
1719 _ => return self.error(LoneLeadingSurrogateInHexEscape),
1723 n => match char::from_u32(n as u32) {
1724 Some(c) => res.push(c),
1725 None => return self.error(InvalidUnicodeCodePoint),
1728 _ => return self.error(InvalidEscape),
1731 } else if self.ch_is('\\') {
1739 Some(c) => res.push(c),
1740 None => unreachable!()
1746 // Invoked at each iteration, consumes the stream until it has enough
1747 // information to return a JsonEvent.
1748 // Manages an internal state so that parsing can be interrupted and resumed.
1749 // Also keeps track of the position in the logical structure of the json
1750 // stream int the form of a stack that can be queried by the user using the
1752 fn parse(&mut self) -> JsonEvent {
1754 // The only paths where the loop can spin a new iteration
1755 // are in the cases ParseArrayComma and ParseObjectComma if ','
1756 // is parsed. In these cases the state is set to (respectively)
1757 // ParseArray(false) and ParseObject(false), which always return,
1758 // so there is no risk of getting stuck in an infinite loop.
1759 // All other paths return before the end of the loop's iteration.
1760 self.parse_whitespace();
1764 return self.parse_start();
1766 ParseArray(first) => {
1767 return self.parse_array(first);
1769 ParseArrayComma => {
1770 match self.parse_array_comma_or_end() {
1771 Some(evt) => { return evt; }
1775 ParseObject(first) => {
1776 return self.parse_object(first);
1778 ParseObjectComma => {
1780 if self.ch_is(',') {
1781 self.state = ParseObject(false);
1784 return self.parse_object_end();
1788 return self.error_event(InvalidSyntax);
1794 fn parse_start(&mut self) -> JsonEvent {
1795 let val = self.parse_value();
1796 self.state = match val {
1797 Error(_) => ParseFinished,
1798 ArrayStart => ParseArray(true),
1799 ObjectStart => ParseObject(true),
1800 _ => ParseBeforeFinish,
1805 fn parse_array(&mut self, first: bool) -> JsonEvent {
1806 if self.ch_is(']') {
1808 self.error_event(InvalidSyntax)
1810 self.state = if self.stack.is_empty() {
1812 } else if self.stack.last_is_index() {
1822 self.stack.push_index(0);
1824 let val = self.parse_value();
1825 self.state = match val {
1826 Error(_) => ParseFinished,
1827 ArrayStart => ParseArray(true),
1828 ObjectStart => ParseObject(true),
1829 _ => ParseArrayComma,
1835 fn parse_array_comma_or_end(&mut self) -> Option<JsonEvent> {
1836 if self.ch_is(',') {
1837 self.stack.bump_index();
1838 self.state = ParseArray(false);
1841 } else if self.ch_is(']') {
1843 self.state = if self.stack.is_empty() {
1845 } else if self.stack.last_is_index() {
1852 } else if self.eof() {
1853 Some(self.error_event(EOFWhileParsingArray))
1855 Some(self.error_event(InvalidSyntax))
1859 fn parse_object(&mut self, first: bool) -> JsonEvent {
1860 if self.ch_is('}') {
1862 if self.stack.is_empty() {
1863 return self.error_event(TrailingComma);
1868 self.state = if self.stack.is_empty() {
1870 } else if self.stack.last_is_index() {
1879 return self.error_event(EOFWhileParsingObject);
1881 if !self.ch_is('"') {
1882 return self.error_event(KeyMustBeAString);
1884 let s = match self.parse_str() {
1887 self.state = ParseFinished;
1891 self.parse_whitespace();
1893 return self.error_event(EOFWhileParsingObject);
1894 } else if self.ch_or_null() != ':' {
1895 return self.error_event(ExpectedColon);
1897 self.stack.push_key(s);
1899 self.parse_whitespace();
1901 let val = self.parse_value();
1903 self.state = match val {
1904 Error(_) => ParseFinished,
1905 ArrayStart => ParseArray(true),
1906 ObjectStart => ParseObject(true),
1907 _ => ParseObjectComma,
1912 fn parse_object_end(&mut self) -> JsonEvent {
1913 if self.ch_is('}') {
1914 self.state = if self.stack.is_empty() {
1916 } else if self.stack.last_is_index() {
1923 } else if self.eof() {
1924 self.error_event(EOFWhileParsingObject)
1926 self.error_event(InvalidSyntax)
1930 fn parse_value(&mut self) -> JsonEvent {
1931 if self.eof() { return self.error_event(EOFWhileParsingValue); }
1932 match self.ch_or_null() {
1933 'n' => { self.parse_ident("ull", NullValue) }
1934 't' => { self.parse_ident("rue", BooleanValue(true)) }
1935 'f' => { self.parse_ident("alse", BooleanValue(false)) }
1936 '0' ... '9' | '-' => self.parse_number(),
1937 '"' => match self.parse_str() {
1938 Ok(s) => StringValue(s),
1949 _ => { self.error_event(InvalidSyntax) }
1953 fn parse_ident(&mut self, ident: &str, value: JsonEvent) -> JsonEvent {
1954 if ident.chars().all(|c| Some(c) == self.next_char()) {
1958 Error(SyntaxError(InvalidSyntax, self.line, self.col))
1962 fn error_event(&mut self, reason: ErrorCode) -> JsonEvent {
1963 self.state = ParseFinished;
1964 Error(SyntaxError(reason, self.line, self.col))
1968 /// A Builder consumes a json::Parser to create a generic Json structure.
1969 pub struct Builder<T> {
1971 token: Option<JsonEvent>,
1974 impl<T: Iterator<Item=char>> Builder<T> {
1975 /// Create a JSON Builder.
1976 pub fn new(src: T) -> Builder<T> {
1977 Builder { parser: Parser::new(src), token: None, }
1980 // Decode a Json value from a Parser.
1981 pub fn build(&mut self) -> Result<Json, BuilderError> {
1983 let result = self.build_value();
1987 Some(Error(e)) => { return Err(e); }
1988 ref tok => { panic!("unexpected token {:?}", tok.clone()); }
1993 fn bump(&mut self) {
1994 self.token = self.parser.next();
1997 fn build_value(&mut self) -> Result<Json, BuilderError> {
1998 return match self.token {
1999 Some(NullValue) => Ok(Json::Null),
2000 Some(I64Value(n)) => Ok(Json::I64(n)),
2001 Some(U64Value(n)) => Ok(Json::U64(n)),
2002 Some(F64Value(n)) => Ok(Json::F64(n)),
2003 Some(BooleanValue(b)) => Ok(Json::Boolean(b)),
2004 Some(StringValue(ref mut s)) => {
2005 let mut temp = string::String::new();
2007 Ok(Json::String(temp))
2009 Some(Error(e)) => Err(e),
2010 Some(ArrayStart) => self.build_array(),
2011 Some(ObjectStart) => self.build_object(),
2012 Some(ObjectEnd) => self.parser.error(InvalidSyntax),
2013 Some(ArrayEnd) => self.parser.error(InvalidSyntax),
2014 None => self.parser.error(EOFWhileParsingValue),
2018 fn build_array(&mut self) -> Result<Json, BuilderError> {
2020 let mut values = Vec::new();
2023 if self.token == Some(ArrayEnd) {
2024 return Ok(Json::Array(values.into_iter().collect()));
2026 match self.build_value() {
2027 Ok(v) => values.push(v),
2028 Err(e) => { return Err(e) }
2034 fn build_object(&mut self) -> Result<Json, BuilderError> {
2037 let mut values = BTreeMap::new();
2041 Some(ObjectEnd) => { return Ok(Json::Object(values)); }
2042 Some(Error(e)) => { return Err(e); }
2046 let key = match self.parser.stack().top() {
2047 Some(StackElement::Key(k)) => { k.to_string() }
2048 _ => { panic!("invalid state"); }
2050 match self.build_value() {
2051 Ok(value) => { values.insert(key, value); }
2052 Err(e) => { return Err(e); }
2056 return self.parser.error(EOFWhileParsingObject);
2060 /// Decodes a json value from an `&mut io::Reader`
2061 pub fn from_reader(rdr: &mut io::Reader) -> Result<Json, BuilderError> {
2062 let contents = match rdr.read_to_end() {
2064 Err(e) => return Err(io_error_to_error(e))
2066 let s = match str::from_utf8(contents.as_slice()).ok() {
2068 _ => return Err(SyntaxError(NotUtf8, 0, 0))
2070 let mut builder = Builder::new(s.chars());
2074 /// Decodes a json value from a string
2075 pub fn from_str(s: &str) -> Result<Json, BuilderError> {
2076 let mut builder = Builder::new(s.chars());
2080 /// A structure to decode JSON to values in rust.
2081 pub struct Decoder {
2086 /// Creates a new decoder instance for decoding the specified JSON value.
2087 pub fn new(json: Json) -> Decoder {
2088 Decoder { stack: vec![json] }
2093 fn pop(&mut self) -> Json {
2094 self.stack.pop().unwrap()
2098 macro_rules! expect {
2099 ($e:expr, Null) => ({
2101 Json::Null => Ok(()),
2102 other => Err(ExpectedError("Null".to_string(),
2103 format!("{}", other)))
2106 ($e:expr, $t:ident) => ({
2108 Json::$t(v) => Ok(v),
2110 Err(ExpectedError(stringify!($t).to_string(),
2111 format!("{}", other)))
2117 macro_rules! read_primitive {
2118 ($name:ident, $ty:ty) => {
2119 fn $name(&mut self) -> DecodeResult<$ty> {
2121 Json::I64(f) => match num::cast(f) {
2123 None => Err(ExpectedError("Number".to_string(), format!("{}", f))),
2125 Json::U64(f) => match num::cast(f) {
2127 None => Err(ExpectedError("Number".to_string(), format!("{}", f))),
2129 Json::F64(f) => Err(ExpectedError("Integer".to_string(), format!("{}", f))),
2130 // re: #12967.. a type w/ numeric keys (ie HashMap<uint, V> etc)
2131 // is going to have a string here, as per JSON spec.
2132 Json::String(s) => match s.parse() {
2134 None => Err(ExpectedError("Number".to_string(), s)),
2136 value => Err(ExpectedError("Number".to_string(), format!("{}", value))),
2142 impl ::Decoder for Decoder {
2143 type Error = DecoderError;
2145 fn read_nil(&mut self) -> DecodeResult<()> {
2146 expect!(self.pop(), Null)
2149 read_primitive! { read_uint, uint }
2150 read_primitive! { read_u8, u8 }
2151 read_primitive! { read_u16, u16 }
2152 read_primitive! { read_u32, u32 }
2153 read_primitive! { read_u64, u64 }
2154 read_primitive! { read_int, int }
2155 read_primitive! { read_i8, i8 }
2156 read_primitive! { read_i16, i16 }
2157 read_primitive! { read_i32, i32 }
2158 read_primitive! { read_i64, i64 }
2160 fn read_f32(&mut self) -> DecodeResult<f32> { self.read_f64().map(|x| x as f32) }
2162 fn read_f64(&mut self) -> DecodeResult<f64> {
2164 Json::I64(f) => Ok(f as f64),
2165 Json::U64(f) => Ok(f as f64),
2166 Json::F64(f) => Ok(f),
2167 Json::String(s) => {
2168 // re: #12967.. a type w/ numeric keys (ie HashMap<uint, V> etc)
2169 // is going to have a string here, as per JSON spec.
2172 None => Err(ExpectedError("Number".to_string(), s)),
2175 Json::Null => Ok(f64::NAN),
2176 value => Err(ExpectedError("Number".to_string(), format!("{}", value)))
2180 fn read_bool(&mut self) -> DecodeResult<bool> {
2181 expect!(self.pop(), Boolean)
2184 fn read_char(&mut self) -> DecodeResult<char> {
2185 let s = try!(self.read_str());
2187 let mut it = s.chars();
2188 match (it.next(), it.next()) {
2189 // exactly one character
2190 (Some(c), None) => return Ok(c),
2194 Err(ExpectedError("single character string".to_string(), format!("{}", s)))
2197 fn read_str(&mut self) -> DecodeResult<string::String> {
2198 expect!(self.pop(), String)
2201 fn read_enum<T, F>(&mut self, _name: &str, f: F) -> DecodeResult<T> where
2202 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2207 fn read_enum_variant<T, F>(&mut self, names: &[&str],
2208 mut f: F) -> DecodeResult<T>
2209 where F: FnMut(&mut Decoder, uint) -> DecodeResult<T>,
2211 let name = match self.pop() {
2212 Json::String(s) => s,
2213 Json::Object(mut o) => {
2214 let n = match o.remove(&"variant".to_string()) {
2215 Some(Json::String(s)) => s,
2217 return Err(ExpectedError("String".to_string(), format!("{}", val)))
2220 return Err(MissingFieldError("variant".to_string()))
2223 match o.remove(&"fields".to_string()) {
2224 Some(Json::Array(l)) => {
2225 for field in l.into_iter().rev() {
2226 self.stack.push(field);
2230 return Err(ExpectedError("Array".to_string(), format!("{}", val)))
2233 return Err(MissingFieldError("fields".to_string()))
2239 return Err(ExpectedError("String or Object".to_string(), format!("{}", json)))
2242 let idx = match names.iter().position(|n| *n == &name[]) {
2244 None => return Err(UnknownVariantError(name))
2249 fn read_enum_variant_arg<T, F>(&mut self, _idx: uint, f: F) -> DecodeResult<T> where
2250 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2255 fn read_enum_struct_variant<T, F>(&mut self, names: &[&str], f: F) -> DecodeResult<T> where
2256 F: FnMut(&mut Decoder, uint) -> DecodeResult<T>,
2258 self.read_enum_variant(names, f)
2262 fn read_enum_struct_variant_field<T, F>(&mut self,
2266 -> DecodeResult<T> where
2267 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2269 self.read_enum_variant_arg(idx, f)
2272 fn read_struct<T, F>(&mut self, _name: &str, _len: uint, f: F) -> DecodeResult<T> where
2273 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2275 let value = try!(f(self));
2280 fn read_struct_field<T, F>(&mut self,
2284 -> DecodeResult<T> where
2285 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2287 let mut obj = try!(expect!(self.pop(), Object));
2289 let value = match obj.remove(&name.to_string()) {
2291 // Add a Null and try to parse it as an Option<_>
2292 // to get None as a default value.
2293 self.stack.push(Json::Null);
2296 Err(_) => return Err(MissingFieldError(name.to_string())),
2300 self.stack.push(json);
2304 self.stack.push(Json::Object(obj));
2308 fn read_tuple<T, F>(&mut self, tuple_len: uint, f: F) -> DecodeResult<T> where
2309 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2311 self.read_seq(move |d, len| {
2312 if len == tuple_len {
2315 Err(ExpectedError(format!("Tuple{}", tuple_len), format!("Tuple{}", len)))
2320 fn read_tuple_arg<T, F>(&mut self, idx: uint, f: F) -> DecodeResult<T> where
2321 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2323 self.read_seq_elt(idx, f)
2326 fn read_tuple_struct<T, F>(&mut self,
2330 -> DecodeResult<T> where
2331 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2333 self.read_tuple(len, f)
2336 fn read_tuple_struct_arg<T, F>(&mut self,
2339 -> DecodeResult<T> where
2340 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2342 self.read_tuple_arg(idx, f)
2345 fn read_option<T, F>(&mut self, mut f: F) -> DecodeResult<T> where
2346 F: FnMut(&mut Decoder, bool) -> DecodeResult<T>,
2349 Json::Null => f(self, false),
2350 value => { self.stack.push(value); f(self, true) }
2354 fn read_seq<T, F>(&mut self, f: F) -> DecodeResult<T> where
2355 F: FnOnce(&mut Decoder, uint) -> DecodeResult<T>,
2357 let array = try!(expect!(self.pop(), Array));
2358 let len = array.len();
2359 for v in array.into_iter().rev() {
2365 fn read_seq_elt<T, F>(&mut self, _idx: uint, f: F) -> DecodeResult<T> where
2366 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2371 fn read_map<T, F>(&mut self, f: F) -> DecodeResult<T> where
2372 F: FnOnce(&mut Decoder, uint) -> DecodeResult<T>,
2374 let obj = try!(expect!(self.pop(), Object));
2375 let len = obj.len();
2376 for (key, value) in obj.into_iter() {
2377 self.stack.push(value);
2378 self.stack.push(Json::String(key));
2383 fn read_map_elt_key<T, F>(&mut self, _idx: uint, f: F) -> DecodeResult<T> where
2384 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2389 fn read_map_elt_val<T, F>(&mut self, _idx: uint, f: F) -> DecodeResult<T> where
2390 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2395 fn error(&mut self, err: &str) -> DecoderError {
2396 ApplicationError(err.to_string())
2400 /// A trait for converting values to JSON
2402 /// Converts the value of `self` to an instance of JSON
2403 fn to_json(&self) -> Json;
2406 macro_rules! to_json_impl_i64 {
2408 $(impl ToJson for $t {
2409 fn to_json(&self) -> Json { Json::I64(*self as i64) }
2414 to_json_impl_i64! { int, i8, i16, i32, i64 }
2416 macro_rules! to_json_impl_u64 {
2418 $(impl ToJson for $t {
2419 fn to_json(&self) -> Json { Json::U64(*self as u64) }
2424 to_json_impl_u64! { uint, u8, u16, u32, u64 }
2426 impl ToJson for Json {
2427 fn to_json(&self) -> Json { self.clone() }
2430 impl ToJson for f32 {
2431 fn to_json(&self) -> Json { (*self as f64).to_json() }
2434 impl ToJson for f64 {
2435 fn to_json(&self) -> Json {
2436 match self.classify() {
2437 Fp::Nan | Fp::Infinite => Json::Null,
2438 _ => Json::F64(*self)
2443 impl ToJson for () {
2444 fn to_json(&self) -> Json { Json::Null }
2447 impl ToJson for bool {
2448 fn to_json(&self) -> Json { Json::Boolean(*self) }
2451 impl ToJson for str {
2452 fn to_json(&self) -> Json { Json::String(self.to_string()) }
2455 impl ToJson for string::String {
2456 fn to_json(&self) -> Json { Json::String((*self).clone()) }
2459 macro_rules! tuple_impl {
2460 // use variables to indicate the arity of the tuple
2461 ($($tyvar:ident),* ) => {
2462 // the trailing commas are for the 1 tuple
2464 $( $tyvar : ToJson ),*
2465 > ToJson for ( $( $tyvar ),* , ) {
2468 #[allow(non_snake_case)]
2469 fn to_json(&self) -> Json {
2471 ($(ref $tyvar),*,) => Json::Array(vec![$($tyvar.to_json()),*])
2480 tuple_impl!{A, B, C}
2481 tuple_impl!{A, B, C, D}
2482 tuple_impl!{A, B, C, D, E}
2483 tuple_impl!{A, B, C, D, E, F}
2484 tuple_impl!{A, B, C, D, E, F, G}
2485 tuple_impl!{A, B, C, D, E, F, G, H}
2486 tuple_impl!{A, B, C, D, E, F, G, H, I}
2487 tuple_impl!{A, B, C, D, E, F, G, H, I, J}
2488 tuple_impl!{A, B, C, D, E, F, G, H, I, J, K}
2489 tuple_impl!{A, B, C, D, E, F, G, H, I, J, K, L}
2491 impl<A: ToJson> ToJson for [A] {
2492 fn to_json(&self) -> Json { Json::Array(self.iter().map(|elt| elt.to_json()).collect()) }
2495 impl<A: ToJson> ToJson for Vec<A> {
2496 fn to_json(&self) -> Json { Json::Array(self.iter().map(|elt| elt.to_json()).collect()) }
2499 impl<A: ToJson> ToJson for BTreeMap<string::String, A> {
2500 fn to_json(&self) -> Json {
2501 let mut d = BTreeMap::new();
2502 for (key, value) in self.iter() {
2503 d.insert((*key).clone(), value.to_json());
2509 impl<A: ToJson> ToJson for HashMap<string::String, A> {
2510 fn to_json(&self) -> Json {
2511 let mut d = BTreeMap::new();
2512 for (key, value) in self.iter() {
2513 d.insert((*key).clone(), value.to_json());
2519 impl<A:ToJson> ToJson for Option<A> {
2520 fn to_json(&self) -> Json {
2523 Some(ref value) => value.to_json()
2528 struct FormatShim<'a, 'b: 'a> {
2529 inner: &'a mut fmt::Formatter<'b>,
2532 impl<'a, 'b> fmt::Writer for FormatShim<'a, 'b> {
2533 fn write_str(&mut self, s: &str) -> fmt::Result {
2534 match self.inner.write_str(s) {
2536 Err(_) => Err(fmt::Error)
2541 impl fmt::Display for Json {
2542 /// Encodes a json value into a string
2543 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
2544 let mut shim = FormatShim { inner: f };
2545 let mut encoder = Encoder::new(&mut shim);
2546 match self.encode(&mut encoder) {
2548 Err(_) => Err(fmt::Error)
2553 impl<'a> fmt::Display for PrettyJson<'a> {
2554 /// Encodes a json value into a string
2555 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
2556 let mut shim = FormatShim { inner: f };
2557 let mut encoder = PrettyEncoder::new(&mut shim);
2558 match self.inner.encode(&mut encoder) {
2560 Err(_) => Err(fmt::Error)
2565 impl<'a, T: Encodable> fmt::Display for AsJson<'a, T> {
2566 /// Encodes a json value into a string
2567 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
2568 let mut shim = FormatShim { inner: f };
2569 let mut encoder = Encoder::new(&mut shim);
2570 match self.inner.encode(&mut encoder) {
2572 Err(_) => Err(fmt::Error)
2577 impl<'a, T> AsPrettyJson<'a, T> {
2578 /// Set the indentation level for the emitted JSON
2579 pub fn indent(mut self, indent: uint) -> AsPrettyJson<'a, T> {
2580 self.indent = Some(indent);
2585 impl<'a, T: Encodable> fmt::Display for AsPrettyJson<'a, T> {
2586 /// Encodes a json value into a string
2587 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
2588 let mut shim = FormatShim { inner: f };
2589 let mut encoder = PrettyEncoder::new(&mut shim);
2591 Some(n) => encoder.set_indent(n),
2594 match self.inner.encode(&mut encoder) {
2596 Err(_) => Err(fmt::Error)
2601 impl FromStr for Json {
2602 fn from_str(s: &str) -> Option<Json> {
2610 use self::Animal::*;
2611 use self::DecodeEnum::*;
2612 use self::test::Bencher;
2613 use {Encodable, Decodable};
2615 use super::ErrorCode::*;
2616 use super::ParserError::*;
2617 use super::DecoderError::*;
2618 use super::JsonEvent::*;
2619 use super::{Json, from_str, DecodeResult, DecoderError, JsonEvent, Parser,
2620 StackElement, Stack, Decoder, Encoder, EncoderError};
2621 use std::{i64, u64, f32, f64, io};
2622 use std::collections::BTreeMap;
2623 use std::num::Float;
2626 #[derive(RustcDecodable, Eq, PartialEq, Show)]
2632 fn test_decode_option_none() {
2634 let obj: OptionData = super::decode(s).unwrap();
2635 assert_eq!(obj, OptionData { opt: None });
2639 fn test_decode_option_some() {
2640 let s = "{ \"opt\": 10 }";
2641 let obj: OptionData = super::decode(s).unwrap();
2642 assert_eq!(obj, OptionData { opt: Some(10u) });
2646 fn test_decode_option_malformed() {
2647 check_err::<OptionData>("{ \"opt\": [] }",
2648 ExpectedError("Number".to_string(), "[]".to_string()));
2649 check_err::<OptionData>("{ \"opt\": false }",
2650 ExpectedError("Number".to_string(), "false".to_string()));
2653 #[derive(PartialEq, RustcEncodable, RustcDecodable, Show)]
2656 Frog(string::String, int)
2659 #[derive(PartialEq, RustcEncodable, RustcDecodable, Show)]
2663 c: Vec<string::String>,
2666 #[derive(PartialEq, RustcEncodable, RustcDecodable, Show)]
2671 fn mk_object(items: &[(string::String, Json)]) -> Json {
2672 let mut d = BTreeMap::new();
2674 for item in items.iter() {
2676 (ref key, ref value) => { d.insert((*key).clone(), (*value).clone()); },
2684 fn test_from_str_trait() {
2686 assert!(s.parse::<Json>().unwrap() == s.parse().unwrap());
2690 fn test_write_null() {
2691 assert_eq!(Null.to_string(), "null");
2692 assert_eq!(Null.pretty().to_string(), "null");
2696 fn test_write_i64() {
2697 assert_eq!(U64(0).to_string(), "0");
2698 assert_eq!(U64(0).pretty().to_string(), "0");
2700 assert_eq!(U64(1234).to_string(), "1234");
2701 assert_eq!(U64(1234).pretty().to_string(), "1234");
2703 assert_eq!(I64(-5678).to_string(), "-5678");
2704 assert_eq!(I64(-5678).pretty().to_string(), "-5678");
2706 assert_eq!(U64(7650007200025252000).to_string(), "7650007200025252000");
2707 assert_eq!(U64(7650007200025252000).pretty().to_string(), "7650007200025252000");
2711 fn test_write_f64() {
2712 assert_eq!(F64(3.0).to_string(), "3.0");
2713 assert_eq!(F64(3.0).pretty().to_string(), "3.0");
2715 assert_eq!(F64(3.1).to_string(), "3.1");
2716 assert_eq!(F64(3.1).pretty().to_string(), "3.1");
2718 assert_eq!(F64(-1.5).to_string(), "-1.5");
2719 assert_eq!(F64(-1.5).pretty().to_string(), "-1.5");
2721 assert_eq!(F64(0.5).to_string(), "0.5");
2722 assert_eq!(F64(0.5).pretty().to_string(), "0.5");
2724 assert_eq!(F64(f64::NAN).to_string(), "null");
2725 assert_eq!(F64(f64::NAN).pretty().to_string(), "null");
2727 assert_eq!(F64(f64::INFINITY).to_string(), "null");
2728 assert_eq!(F64(f64::INFINITY).pretty().to_string(), "null");
2730 assert_eq!(F64(f64::NEG_INFINITY).to_string(), "null");
2731 assert_eq!(F64(f64::NEG_INFINITY).pretty().to_string(), "null");
2735 fn test_write_str() {
2736 assert_eq!(String("".to_string()).to_string(), "\"\"");
2737 assert_eq!(String("".to_string()).pretty().to_string(), "\"\"");
2739 assert_eq!(String("homura".to_string()).to_string(), "\"homura\"");
2740 assert_eq!(String("madoka".to_string()).pretty().to_string(), "\"madoka\"");
2744 fn test_write_bool() {
2745 assert_eq!(Boolean(true).to_string(), "true");
2746 assert_eq!(Boolean(true).pretty().to_string(), "true");
2748 assert_eq!(Boolean(false).to_string(), "false");
2749 assert_eq!(Boolean(false).pretty().to_string(), "false");
2753 fn test_write_array() {
2754 assert_eq!(Array(vec![]).to_string(), "[]");
2755 assert_eq!(Array(vec![]).pretty().to_string(), "[]");
2757 assert_eq!(Array(vec![Boolean(true)]).to_string(), "[true]");
2759 Array(vec![Boolean(true)]).pretty().to_string(),
2766 let long_test_array = Array(vec![
2769 Array(vec![String("foo\nbar".to_string()), F64(3.5)])]);
2771 assert_eq!(long_test_array.to_string(),
2772 "[false,null,[\"foo\\nbar\",3.5]]");
2774 long_test_array.pretty().to_string(),
2788 fn test_write_object() {
2789 assert_eq!(mk_object(&[]).to_string(), "{}");
2790 assert_eq!(mk_object(&[]).pretty().to_string(), "{}");
2794 ("a".to_string(), Boolean(true))
2799 mk_object(&[("a".to_string(), Boolean(true))]).pretty().to_string(),
2806 let complex_obj = mk_object(&[
2807 ("b".to_string(), Array(vec![
2808 mk_object(&[("c".to_string(), String("\x0c\r".to_string()))]),
2809 mk_object(&[("d".to_string(), String("".to_string()))])
2814 complex_obj.to_string(),
2817 {\"c\":\"\\f\\r\"},\
2823 complex_obj.pretty().to_string(),
2828 \"c\": \"\\f\\r\"\n \
2837 let a = mk_object(&[
2838 ("a".to_string(), Boolean(true)),
2839 ("b".to_string(), Array(vec![
2840 mk_object(&[("c".to_string(), String("\x0c\r".to_string()))]),
2841 mk_object(&[("d".to_string(), String("".to_string()))])
2845 // We can't compare the strings directly because the object fields be
2846 // printed in a different order.
2847 assert_eq!(a.clone(), a.to_string().parse().unwrap());
2848 assert_eq!(a.clone(), a.pretty().to_string().parse().unwrap());
2852 fn test_write_enum() {
2855 format!("{}", super::as_json(&animal)),
2859 format!("{}", super::as_pretty_json(&animal)),
2863 let animal = Frog("Henry".to_string(), 349);
2865 format!("{}", super::as_json(&animal)),
2866 "{\"variant\":\"Frog\",\"fields\":[\"Henry\",349]}"
2869 format!("{}", super::as_pretty_json(&animal)),
2871 \"variant\": \"Frog\",\n \
2880 macro_rules! check_encoder_for_simple {
2881 ($value:expr, $expected:expr) => ({
2882 let s = format!("{}", super::as_json(&$value));
2883 assert_eq!(s, $expected);
2885 let s = format!("{}", super::as_pretty_json(&$value));
2886 assert_eq!(s, $expected);
2891 fn test_write_some() {
2892 check_encoder_for_simple!(Some("jodhpurs".to_string()), "\"jodhpurs\"");
2896 fn test_write_none() {
2897 check_encoder_for_simple!(None::<string::String>, "null");
2901 fn test_write_char() {
2902 check_encoder_for_simple!('a', "\"a\"");
2903 check_encoder_for_simple!('\t', "\"\\t\"");
2904 check_encoder_for_simple!('\u{0000}', "\"\\u0000\"");
2905 check_encoder_for_simple!('\u{001b}', "\"\\u001b\"");
2906 check_encoder_for_simple!('\u{007f}', "\"\\u007f\"");
2907 check_encoder_for_simple!('\u{00a0}', "\"\u{00a0}\"");
2908 check_encoder_for_simple!('\u{abcd}', "\"\u{abcd}\"");
2909 check_encoder_for_simple!('\u{10ffff}', "\"\u{10ffff}\"");
2913 fn test_trailing_characters() {
2914 assert_eq!(from_str("nulla"), Err(SyntaxError(TrailingCharacters, 1, 5)));
2915 assert_eq!(from_str("truea"), Err(SyntaxError(TrailingCharacters, 1, 5)));
2916 assert_eq!(from_str("falsea"), Err(SyntaxError(TrailingCharacters, 1, 6)));
2917 assert_eq!(from_str("1a"), Err(SyntaxError(TrailingCharacters, 1, 2)));
2918 assert_eq!(from_str("[]a"), Err(SyntaxError(TrailingCharacters, 1, 3)));
2919 assert_eq!(from_str("{}a"), Err(SyntaxError(TrailingCharacters, 1, 3)));
2923 fn test_read_identifiers() {
2924 assert_eq!(from_str("n"), Err(SyntaxError(InvalidSyntax, 1, 2)));
2925 assert_eq!(from_str("nul"), Err(SyntaxError(InvalidSyntax, 1, 4)));
2926 assert_eq!(from_str("t"), Err(SyntaxError(InvalidSyntax, 1, 2)));
2927 assert_eq!(from_str("truz"), Err(SyntaxError(InvalidSyntax, 1, 4)));
2928 assert_eq!(from_str("f"), Err(SyntaxError(InvalidSyntax, 1, 2)));
2929 assert_eq!(from_str("faz"), Err(SyntaxError(InvalidSyntax, 1, 3)));
2931 assert_eq!(from_str("null"), Ok(Null));
2932 assert_eq!(from_str("true"), Ok(Boolean(true)));
2933 assert_eq!(from_str("false"), Ok(Boolean(false)));
2934 assert_eq!(from_str(" null "), Ok(Null));
2935 assert_eq!(from_str(" true "), Ok(Boolean(true)));
2936 assert_eq!(from_str(" false "), Ok(Boolean(false)));
2940 fn test_decode_identifiers() {
2941 let v: () = super::decode("null").unwrap();
2944 let v: bool = super::decode("true").unwrap();
2945 assert_eq!(v, true);
2947 let v: bool = super::decode("false").unwrap();
2948 assert_eq!(v, false);
2952 fn test_read_number() {
2953 assert_eq!(from_str("+"), Err(SyntaxError(InvalidSyntax, 1, 1)));
2954 assert_eq!(from_str("."), Err(SyntaxError(InvalidSyntax, 1, 1)));
2955 assert_eq!(from_str("NaN"), Err(SyntaxError(InvalidSyntax, 1, 1)));
2956 assert_eq!(from_str("-"), Err(SyntaxError(InvalidNumber, 1, 2)));
2957 assert_eq!(from_str("00"), Err(SyntaxError(InvalidNumber, 1, 2)));
2958 assert_eq!(from_str("1."), Err(SyntaxError(InvalidNumber, 1, 3)));
2959 assert_eq!(from_str("1e"), Err(SyntaxError(InvalidNumber, 1, 3)));
2960 assert_eq!(from_str("1e+"), Err(SyntaxError(InvalidNumber, 1, 4)));
2962 assert_eq!(from_str("18446744073709551616"), Err(SyntaxError(InvalidNumber, 1, 20)));
2963 assert_eq!(from_str("-9223372036854775809"), Err(SyntaxError(InvalidNumber, 1, 21)));
2965 assert_eq!(from_str("3"), Ok(U64(3)));
2966 assert_eq!(from_str("3.1"), Ok(F64(3.1)));
2967 assert_eq!(from_str("-1.2"), Ok(F64(-1.2)));
2968 assert_eq!(from_str("0.4"), Ok(F64(0.4)));
2969 assert_eq!(from_str("0.4e5"), Ok(F64(0.4e5)));
2970 assert_eq!(from_str("0.4e+15"), Ok(F64(0.4e15)));
2971 assert_eq!(from_str("0.4e-01"), Ok(F64(0.4e-01)));
2972 assert_eq!(from_str(" 3 "), Ok(U64(3)));
2974 assert_eq!(from_str("-9223372036854775808"), Ok(I64(i64::MIN)));
2975 assert_eq!(from_str("9223372036854775807"), Ok(U64(i64::MAX as u64)));
2976 assert_eq!(from_str("18446744073709551615"), Ok(U64(u64::MAX)));
2980 fn test_decode_numbers() {
2981 let v: f64 = super::decode("3").unwrap();
2984 let v: f64 = super::decode("3.1").unwrap();
2987 let v: f64 = super::decode("-1.2").unwrap();
2988 assert_eq!(v, -1.2);
2990 let v: f64 = super::decode("0.4").unwrap();
2993 let v: f64 = super::decode("0.4e5").unwrap();
2994 assert_eq!(v, 0.4e5);
2996 let v: f64 = super::decode("0.4e15").unwrap();
2997 assert_eq!(v, 0.4e15);
2999 let v: f64 = super::decode("0.4e-01").unwrap();
3000 assert_eq!(v, 0.4e-01);
3002 let v: u64 = super::decode("0").unwrap();
3005 let v: u64 = super::decode("18446744073709551615").unwrap();
3006 assert_eq!(v, u64::MAX);
3008 let v: i64 = super::decode("-9223372036854775808").unwrap();
3009 assert_eq!(v, i64::MIN);
3011 let v: i64 = super::decode("9223372036854775807").unwrap();
3012 assert_eq!(v, i64::MAX);
3014 let res: DecodeResult<i64> = super::decode("765.25252");
3015 assert_eq!(res, Err(ExpectedError("Integer".to_string(),
3016 "765.25252".to_string())));
3020 fn test_read_str() {
3021 assert_eq!(from_str("\""), Err(SyntaxError(EOFWhileParsingString, 1, 2)));
3022 assert_eq!(from_str("\"lol"), Err(SyntaxError(EOFWhileParsingString, 1, 5)));
3024 assert_eq!(from_str("\"\""), Ok(String("".to_string())));
3025 assert_eq!(from_str("\"foo\""), Ok(String("foo".to_string())));
3026 assert_eq!(from_str("\"\\\"\""), Ok(String("\"".to_string())));
3027 assert_eq!(from_str("\"\\b\""), Ok(String("\x08".to_string())));
3028 assert_eq!(from_str("\"\\n\""), Ok(String("\n".to_string())));
3029 assert_eq!(from_str("\"\\r\""), Ok(String("\r".to_string())));
3030 assert_eq!(from_str("\"\\t\""), Ok(String("\t".to_string())));
3031 assert_eq!(from_str(" \"foo\" "), Ok(String("foo".to_string())));
3032 assert_eq!(from_str("\"\\u12ab\""), Ok(String("\u{12ab}".to_string())));
3033 assert_eq!(from_str("\"\\uAB12\""), Ok(String("\u{AB12}".to_string())));
3037 fn test_decode_str() {
3038 let s = [("\"\"", ""),
3041 ("\"\\b\"", "\x08"),
3045 ("\"\\u12ab\"", "\u{12ab}"),
3046 ("\"\\uAB12\"", "\u{AB12}")];
3048 for &(i, o) in s.iter() {
3049 let v: string::String = super::decode(i).unwrap();
3055 fn test_read_array() {
3056 assert_eq!(from_str("["), Err(SyntaxError(EOFWhileParsingValue, 1, 2)));
3057 assert_eq!(from_str("[1"), Err(SyntaxError(EOFWhileParsingArray, 1, 3)));
3058 assert_eq!(from_str("[1,"), Err(SyntaxError(EOFWhileParsingValue, 1, 4)));
3059 assert_eq!(from_str("[1,]"), Err(SyntaxError(InvalidSyntax, 1, 4)));
3060 assert_eq!(from_str("[6 7]"), Err(SyntaxError(InvalidSyntax, 1, 4)));
3062 assert_eq!(from_str("[]"), Ok(Array(vec![])));
3063 assert_eq!(from_str("[ ]"), Ok(Array(vec![])));
3064 assert_eq!(from_str("[true]"), Ok(Array(vec![Boolean(true)])));
3065 assert_eq!(from_str("[ false ]"), Ok(Array(vec![Boolean(false)])));
3066 assert_eq!(from_str("[null]"), Ok(Array(vec![Null])));
3067 assert_eq!(from_str("[3, 1]"),
3068 Ok(Array(vec![U64(3), U64(1)])));
3069 assert_eq!(from_str("\n[3, 2]\n"),
3070 Ok(Array(vec![U64(3), U64(2)])));
3071 assert_eq!(from_str("[2, [4, 1]]"),
3072 Ok(Array(vec![U64(2), Array(vec![U64(4), U64(1)])])));
3076 fn test_decode_array() {
3077 let v: Vec<()> = super::decode("[]").unwrap();
3078 assert_eq!(v, vec![]);
3080 let v: Vec<()> = super::decode("[null]").unwrap();
3081 assert_eq!(v, vec![()]);
3083 let v: Vec<bool> = super::decode("[true]").unwrap();
3084 assert_eq!(v, vec![true]);
3086 let v: Vec<int> = super::decode("[3, 1]").unwrap();
3087 assert_eq!(v, vec![3, 1]);
3089 let v: Vec<Vec<uint>> = super::decode("[[3], [1, 2]]").unwrap();
3090 assert_eq!(v, vec![vec![3], vec![1, 2]]);
3094 fn test_decode_tuple() {
3095 let t: (uint, uint, uint) = super::decode("[1, 2, 3]").unwrap();
3096 assert_eq!(t, (1u, 2, 3));
3098 let t: (uint, string::String) = super::decode("[1, \"two\"]").unwrap();
3099 assert_eq!(t, (1u, "two".to_string()));
3103 fn test_decode_tuple_malformed_types() {
3104 assert!(super::decode::<(uint, string::String)>("[1, 2]").is_err());
3108 fn test_decode_tuple_malformed_length() {
3109 assert!(super::decode::<(uint, uint)>("[1, 2, 3]").is_err());
3113 fn test_read_object() {
3114 assert_eq!(from_str("{"), Err(SyntaxError(EOFWhileParsingObject, 1, 2)));
3115 assert_eq!(from_str("{ "), Err(SyntaxError(EOFWhileParsingObject, 1, 3)));
3116 assert_eq!(from_str("{1"), Err(SyntaxError(KeyMustBeAString, 1, 2)));
3117 assert_eq!(from_str("{ \"a\""), Err(SyntaxError(EOFWhileParsingObject, 1, 6)));
3118 assert_eq!(from_str("{\"a\""), Err(SyntaxError(EOFWhileParsingObject, 1, 5)));
3119 assert_eq!(from_str("{\"a\" "), Err(SyntaxError(EOFWhileParsingObject, 1, 6)));
3121 assert_eq!(from_str("{\"a\" 1"), Err(SyntaxError(ExpectedColon, 1, 6)));
3122 assert_eq!(from_str("{\"a\":"), Err(SyntaxError(EOFWhileParsingValue, 1, 6)));
3123 assert_eq!(from_str("{\"a\":1"), Err(SyntaxError(EOFWhileParsingObject, 1, 7)));
3124 assert_eq!(from_str("{\"a\":1 1"), Err(SyntaxError(InvalidSyntax, 1, 8)));
3125 assert_eq!(from_str("{\"a\":1,"), Err(SyntaxError(EOFWhileParsingObject, 1, 8)));
3127 assert_eq!(from_str("{}").unwrap(), mk_object(&[]));
3128 assert_eq!(from_str("{\"a\": 3}").unwrap(),
3129 mk_object(&[("a".to_string(), U64(3))]));
3131 assert_eq!(from_str(
3132 "{ \"a\": null, \"b\" : true }").unwrap(),
3134 ("a".to_string(), Null),
3135 ("b".to_string(), Boolean(true))]));
3136 assert_eq!(from_str("\n{ \"a\": null, \"b\" : true }\n").unwrap(),
3138 ("a".to_string(), Null),
3139 ("b".to_string(), Boolean(true))]));
3140 assert_eq!(from_str(
3141 "{\"a\" : 1.0 ,\"b\": [ true ]}").unwrap(),
3143 ("a".to_string(), F64(1.0)),
3144 ("b".to_string(), Array(vec![Boolean(true)]))
3146 assert_eq!(from_str(
3152 { \"c\": {\"d\": null} } \
3156 ("a".to_string(), F64(1.0)),
3157 ("b".to_string(), Array(vec![
3159 String("foo\nbar".to_string()),
3161 ("c".to_string(), mk_object(&[("d".to_string(), Null)]))
3168 fn test_decode_struct() {
3171 { \"a\": null, \"b\": 2, \"c\": [\"abc\", \"xyz\"] }
3175 let v: Outer = super::decode(s).unwrap();
3180 Inner { a: (), b: 2, c: vec!["abc".to_string(), "xyz".to_string()] }
3186 #[derive(RustcDecodable)]
3187 struct FloatStruct {
3192 fn test_decode_struct_with_nan() {
3193 let s = "{\"f\":null,\"a\":[null,123]}";
3194 let obj: FloatStruct = super::decode(s).unwrap();
3195 assert!(obj.f.is_nan());
3196 assert!(obj.a[0].is_nan());
3197 assert_eq!(obj.a[1], 123f64);
3201 fn test_decode_option() {
3202 let value: Option<string::String> = super::decode("null").unwrap();
3203 assert_eq!(value, None);
3205 let value: Option<string::String> = super::decode("\"jodhpurs\"").unwrap();
3206 assert_eq!(value, Some("jodhpurs".to_string()));
3210 fn test_decode_enum() {
3211 let value: Animal = super::decode("\"Dog\"").unwrap();
3212 assert_eq!(value, Dog);
3214 let s = "{\"variant\":\"Frog\",\"fields\":[\"Henry\",349]}";
3215 let value: Animal = super::decode(s).unwrap();
3216 assert_eq!(value, Frog("Henry".to_string(), 349));
3220 fn test_decode_map() {
3221 let s = "{\"a\": \"Dog\", \"b\": {\"variant\":\"Frog\",\
3222 \"fields\":[\"Henry\", 349]}}";
3223 let mut map: BTreeMap<string::String, Animal> = super::decode(s).unwrap();
3225 assert_eq!(map.remove(&"a".to_string()), Some(Dog));
3226 assert_eq!(map.remove(&"b".to_string()), Some(Frog("Henry".to_string(), 349)));
3230 fn test_multiline_errors() {
3231 assert_eq!(from_str("{\n \"foo\":\n \"bar\""),
3232 Err(SyntaxError(EOFWhileParsingObject, 3u, 8u)));
3235 #[derive(RustcDecodable)]
3237 struct DecodeStruct {
3241 w: Vec<DecodeStruct>
3243 #[derive(RustcDecodable)]
3248 fn check_err<T: Decodable>(to_parse: &'static str, expected: DecoderError) {
3249 let res: DecodeResult<T> = match from_str(to_parse) {
3250 Err(e) => Err(ParseError(e)),
3251 Ok(json) => Decodable::decode(&mut Decoder::new(json))
3254 Ok(_) => panic!("`{:?}` parsed & decoded ok, expecting error `{:?}`",
3255 to_parse, expected),
3256 Err(ParseError(e)) => panic!("`{:?}` is not valid json: {:?}",
3259 assert_eq!(e, expected);
3264 fn test_decode_errors_struct() {
3265 check_err::<DecodeStruct>("[]", ExpectedError("Object".to_string(), "[]".to_string()));
3266 check_err::<DecodeStruct>("{\"x\": true, \"y\": true, \"z\": \"\", \"w\": []}",
3267 ExpectedError("Number".to_string(), "true".to_string()));
3268 check_err::<DecodeStruct>("{\"x\": 1, \"y\": [], \"z\": \"\", \"w\": []}",
3269 ExpectedError("Boolean".to_string(), "[]".to_string()));
3270 check_err::<DecodeStruct>("{\"x\": 1, \"y\": true, \"z\": {}, \"w\": []}",
3271 ExpectedError("String".to_string(), "{}".to_string()));
3272 check_err::<DecodeStruct>("{\"x\": 1, \"y\": true, \"z\": \"\", \"w\": null}",
3273 ExpectedError("Array".to_string(), "null".to_string()));
3274 check_err::<DecodeStruct>("{\"x\": 1, \"y\": true, \"z\": \"\"}",
3275 MissingFieldError("w".to_string()));
3278 fn test_decode_errors_enum() {
3279 check_err::<DecodeEnum>("{}",
3280 MissingFieldError("variant".to_string()));
3281 check_err::<DecodeEnum>("{\"variant\": 1}",
3282 ExpectedError("String".to_string(), "1".to_string()));
3283 check_err::<DecodeEnum>("{\"variant\": \"A\"}",
3284 MissingFieldError("fields".to_string()));
3285 check_err::<DecodeEnum>("{\"variant\": \"A\", \"fields\": null}",
3286 ExpectedError("Array".to_string(), "null".to_string()));
3287 check_err::<DecodeEnum>("{\"variant\": \"C\", \"fields\": []}",
3288 UnknownVariantError("C".to_string()));
3293 let json_value = from_str("{\"dog\" : \"cat\"}").unwrap();
3294 let found_str = json_value.find("dog");
3295 assert!(found_str.unwrap().as_string().unwrap() == "cat");
3299 fn test_find_path(){
3300 let json_value = from_str("{\"dog\":{\"cat\": {\"mouse\" : \"cheese\"}}}").unwrap();
3301 let found_str = json_value.find_path(&["dog", "cat", "mouse"]);
3302 assert!(found_str.unwrap().as_string().unwrap() == "cheese");
3307 let json_value = from_str("{\"dog\":{\"cat\": {\"mouse\" : \"cheese\"}}}").unwrap();
3308 let found_str = json_value.search("mouse").and_then(|j| j.as_string());
3309 assert!(found_str.unwrap() == "cheese");
3314 let json_value = from_str("{\"animals\":[\"dog\",\"cat\",\"mouse\"]}").unwrap();
3315 let ref array = json_value["animals"];
3316 assert_eq!(array[0].as_string().unwrap(), "dog");
3317 assert_eq!(array[1].as_string().unwrap(), "cat");
3318 assert_eq!(array[2].as_string().unwrap(), "mouse");
3322 fn test_is_object(){
3323 let json_value = from_str("{}").unwrap();
3324 assert!(json_value.is_object());
3328 fn test_as_object(){
3329 let json_value = from_str("{}").unwrap();
3330 let json_object = json_value.as_object();
3331 assert!(json_object.is_some());
3336 let json_value = from_str("[1, 2, 3]").unwrap();
3337 assert!(json_value.is_array());
3342 let json_value = from_str("[1, 2, 3]").unwrap();
3343 let json_array = json_value.as_array();
3344 let expected_length = 3;
3345 assert!(json_array.is_some() && json_array.unwrap().len() == expected_length);
3349 fn test_is_string(){
3350 let json_value = from_str("\"dog\"").unwrap();
3351 assert!(json_value.is_string());
3355 fn test_as_string(){
3356 let json_value = from_str("\"dog\"").unwrap();
3357 let json_str = json_value.as_string();
3358 let expected_str = "dog";
3359 assert_eq!(json_str, Some(expected_str));
3363 fn test_is_number(){
3364 let json_value = from_str("12").unwrap();
3365 assert!(json_value.is_number());
3370 let json_value = from_str("-12").unwrap();
3371 assert!(json_value.is_i64());
3373 let json_value = from_str("12").unwrap();
3374 assert!(!json_value.is_i64());
3376 let json_value = from_str("12.0").unwrap();
3377 assert!(!json_value.is_i64());
3382 let json_value = from_str("12").unwrap();
3383 assert!(json_value.is_u64());
3385 let json_value = from_str("-12").unwrap();
3386 assert!(!json_value.is_u64());
3388 let json_value = from_str("12.0").unwrap();
3389 assert!(!json_value.is_u64());
3394 let json_value = from_str("12").unwrap();
3395 assert!(!json_value.is_f64());
3397 let json_value = from_str("-12").unwrap();
3398 assert!(!json_value.is_f64());
3400 let json_value = from_str("12.0").unwrap();
3401 assert!(json_value.is_f64());
3403 let json_value = from_str("-12.0").unwrap();
3404 assert!(json_value.is_f64());
3409 let json_value = from_str("-12").unwrap();
3410 let json_num = json_value.as_i64();
3411 assert_eq!(json_num, Some(-12));
3416 let json_value = from_str("12").unwrap();
3417 let json_num = json_value.as_u64();
3418 assert_eq!(json_num, Some(12));
3423 let json_value = from_str("12.0").unwrap();
3424 let json_num = json_value.as_f64();
3425 assert_eq!(json_num, Some(12f64));
3429 fn test_is_boolean(){
3430 let json_value = from_str("false").unwrap();
3431 assert!(json_value.is_boolean());
3435 fn test_as_boolean(){
3436 let json_value = from_str("false").unwrap();
3437 let json_bool = json_value.as_boolean();
3438 let expected_bool = false;
3439 assert!(json_bool.is_some() && json_bool.unwrap() == expected_bool);
3444 let json_value = from_str("null").unwrap();
3445 assert!(json_value.is_null());
3450 let json_value = from_str("null").unwrap();
3451 let json_null = json_value.as_null();
3452 let expected_null = ();
3453 assert!(json_null.is_some() && json_null.unwrap() == expected_null);
3457 fn test_encode_hashmap_with_numeric_key() {
3458 use std::str::from_utf8;
3459 use std::io::Writer;
3460 use std::collections::HashMap;
3461 let mut hm: HashMap<uint, bool> = HashMap::new();
3463 let mut mem_buf = Vec::new();
3464 write!(&mut mem_buf, "{}", super::as_pretty_json(&hm)).unwrap();
3465 let json_str = from_utf8(&mem_buf[]).unwrap();
3466 match from_str(json_str) {
3467 Err(_) => panic!("Unable to parse json_str: {:?}", json_str),
3468 _ => {} // it parsed and we are good to go
3473 fn test_prettyencode_hashmap_with_numeric_key() {
3474 use std::str::from_utf8;
3475 use std::io::Writer;
3476 use std::collections::HashMap;
3477 let mut hm: HashMap<uint, bool> = HashMap::new();
3479 let mut mem_buf = Vec::new();
3480 write!(&mut mem_buf, "{}", super::as_pretty_json(&hm)).unwrap();
3481 let json_str = from_utf8(&mem_buf[]).unwrap();
3482 match from_str(json_str) {
3483 Err(_) => panic!("Unable to parse json_str: {:?}", json_str),
3484 _ => {} // it parsed and we are good to go
3489 fn test_prettyencoder_indent_level_param() {
3490 use std::str::from_utf8;
3491 use std::collections::BTreeMap;
3493 let mut tree = BTreeMap::new();
3495 tree.insert("hello".to_string(), String("guten tag".to_string()));
3496 tree.insert("goodbye".to_string(), String("sayonara".to_string()));
3499 // The following layout below should look a lot like
3500 // the pretty-printed JSON (indent * x)
3503 String("greetings".to_string()), // 1x
3504 Object(tree), // 1x + 2x + 2x + 1x
3506 // End JSON array (7 lines)
3509 // Helper function for counting indents
3510 fn indents(source: &str) -> uint {
3511 let trimmed = source.trim_left_matches(' ');
3512 source.len() - trimmed.len()
3515 // Test up to 4 spaces of indents (more?)
3516 for i in range(0, 4u) {
3517 let mut writer = Vec::new();
3518 write!(&mut writer, "{}",
3519 super::as_pretty_json(&json).indent(i)).unwrap();
3521 let printed = from_utf8(&writer[]).unwrap();
3523 // Check for indents at each line
3524 let lines: Vec<&str> = printed.lines().collect();
3525 assert_eq!(lines.len(), 7); // JSON should be 7 lines
3527 assert_eq!(indents(lines[0]), 0 * i); // [
3528 assert_eq!(indents(lines[1]), 1 * i); // "greetings",
3529 assert_eq!(indents(lines[2]), 1 * i); // {
3530 assert_eq!(indents(lines[3]), 2 * i); // "hello": "guten tag",
3531 assert_eq!(indents(lines[4]), 2 * i); // "goodbye": "sayonara"
3532 assert_eq!(indents(lines[5]), 1 * i); // },
3533 assert_eq!(indents(lines[6]), 0 * i); // ]
3535 // Finally, test that the pretty-printed JSON is valid
3536 from_str(printed).ok().expect("Pretty-printed JSON is invalid!");
3541 fn test_hashmap_with_numeric_key_can_handle_double_quote_delimited_key() {
3542 use std::collections::HashMap;
3544 let json_str = "{\"1\":true}";
3545 let json_obj = match from_str(json_str) {
3546 Err(_) => panic!("Unable to parse json_str: {:?}", json_str),
3549 let mut decoder = Decoder::new(json_obj);
3550 let _hm: HashMap<uint, bool> = Decodable::decode(&mut decoder).unwrap();
3554 fn test_hashmap_with_numeric_key_will_error_with_string_keys() {
3555 use std::collections::HashMap;
3557 let json_str = "{\"a\":true}";
3558 let json_obj = match from_str(json_str) {
3559 Err(_) => panic!("Unable to parse json_str: {:?}", json_str),
3562 let mut decoder = Decoder::new(json_obj);
3563 let result: Result<HashMap<uint, bool>, DecoderError> = Decodable::decode(&mut decoder);
3564 assert_eq!(result, Err(ExpectedError("Number".to_string(), "a".to_string())));
3567 fn assert_stream_equal(src: &str,
3568 expected: Vec<(JsonEvent, Vec<StackElement>)>) {
3569 let mut parser = Parser::new(src.chars());
3572 let evt = match parser.next() {
3576 let (ref expected_evt, ref expected_stack) = expected[i];
3577 if !parser.stack().is_equal_to(expected_stack.as_slice()) {
3578 panic!("Parser stack is not equal to {:?}", expected_stack);
3580 assert_eq!(&evt, expected_evt);
3585 #[cfg_attr(target_pointer_width = "32", ignore)] // FIXME(#14064)
3586 fn test_streaming_parser() {
3587 assert_stream_equal(
3588 r#"{ "foo":"bar", "array" : [0, 1, 2, 3, 4, 5], "idents":[null,true,false]}"#,
3590 (ObjectStart, vec![]),
3591 (StringValue("bar".to_string()), vec![StackElement::Key("foo")]),
3592 (ArrayStart, vec![StackElement::Key("array")]),
3593 (U64Value(0), vec![StackElement::Key("array"), StackElement::Index(0)]),
3594 (U64Value(1), vec![StackElement::Key("array"), StackElement::Index(1)]),
3595 (U64Value(2), vec![StackElement::Key("array"), StackElement::Index(2)]),
3596 (U64Value(3), vec![StackElement::Key("array"), StackElement::Index(3)]),
3597 (U64Value(4), vec![StackElement::Key("array"), StackElement::Index(4)]),
3598 (U64Value(5), vec![StackElement::Key("array"), StackElement::Index(5)]),
3599 (ArrayEnd, vec![StackElement::Key("array")]),
3600 (ArrayStart, vec![StackElement::Key("idents")]),
3601 (NullValue, vec![StackElement::Key("idents"),
3602 StackElement::Index(0)]),
3603 (BooleanValue(true), vec![StackElement::Key("idents"),
3604 StackElement::Index(1)]),
3605 (BooleanValue(false), vec![StackElement::Key("idents"),
3606 StackElement::Index(2)]),
3607 (ArrayEnd, vec![StackElement::Key("idents")]),
3608 (ObjectEnd, vec![]),
3612 fn last_event(src: &str) -> JsonEvent {
3613 let mut parser = Parser::new(src.chars());
3614 let mut evt = NullValue;
3616 evt = match parser.next() {
3624 #[cfg_attr(target_pointer_width = "32", ignore)] // FIXME(#14064)
3625 fn test_read_object_streaming() {
3626 assert_eq!(last_event("{ "), Error(SyntaxError(EOFWhileParsingObject, 1, 3)));
3627 assert_eq!(last_event("{1"), Error(SyntaxError(KeyMustBeAString, 1, 2)));
3628 assert_eq!(last_event("{ \"a\""), Error(SyntaxError(EOFWhileParsingObject, 1, 6)));
3629 assert_eq!(last_event("{\"a\""), Error(SyntaxError(EOFWhileParsingObject, 1, 5)));
3630 assert_eq!(last_event("{\"a\" "), Error(SyntaxError(EOFWhileParsingObject, 1, 6)));
3632 assert_eq!(last_event("{\"a\" 1"), Error(SyntaxError(ExpectedColon, 1, 6)));
3633 assert_eq!(last_event("{\"a\":"), Error(SyntaxError(EOFWhileParsingValue, 1, 6)));
3634 assert_eq!(last_event("{\"a\":1"), Error(SyntaxError(EOFWhileParsingObject, 1, 7)));
3635 assert_eq!(last_event("{\"a\":1 1"), Error(SyntaxError(InvalidSyntax, 1, 8)));
3636 assert_eq!(last_event("{\"a\":1,"), Error(SyntaxError(EOFWhileParsingObject, 1, 8)));
3637 assert_eq!(last_event("{\"a\":1,}"), Error(SyntaxError(TrailingComma, 1, 8)));
3639 assert_stream_equal(
3641 vec![(ObjectStart, vec![]), (ObjectEnd, vec![])]
3643 assert_stream_equal(
3646 (ObjectStart, vec![]),
3647 (U64Value(3), vec![StackElement::Key("a")]),
3648 (ObjectEnd, vec![]),
3651 assert_stream_equal(
3652 "{ \"a\": null, \"b\" : true }",
3654 (ObjectStart, vec![]),
3655 (NullValue, vec![StackElement::Key("a")]),
3656 (BooleanValue(true), vec![StackElement::Key("b")]),
3657 (ObjectEnd, vec![]),
3660 assert_stream_equal(
3661 "{\"a\" : 1.0 ,\"b\": [ true ]}",
3663 (ObjectStart, vec![]),
3664 (F64Value(1.0), vec![StackElement::Key("a")]),
3665 (ArrayStart, vec![StackElement::Key("b")]),
3666 (BooleanValue(true),vec![StackElement::Key("b"), StackElement::Index(0)]),
3667 (ArrayEnd, vec![StackElement::Key("b")]),
3668 (ObjectEnd, vec![]),
3671 assert_stream_equal(
3677 { "c": {"d": null} }
3681 (ObjectStart, vec![]),
3682 (F64Value(1.0), vec![StackElement::Key("a")]),
3683 (ArrayStart, vec![StackElement::Key("b")]),
3684 (BooleanValue(true), vec![StackElement::Key("b"),
3685 StackElement::Index(0)]),
3686 (StringValue("foo\nbar".to_string()), vec![StackElement::Key("b"),
3687 StackElement::Index(1)]),
3688 (ObjectStart, vec![StackElement::Key("b"),
3689 StackElement::Index(2)]),
3690 (ObjectStart, vec![StackElement::Key("b"),
3691 StackElement::Index(2),
3692 StackElement::Key("c")]),
3693 (NullValue, vec![StackElement::Key("b"),
3694 StackElement::Index(2),
3695 StackElement::Key("c"),
3696 StackElement::Key("d")]),
3697 (ObjectEnd, vec![StackElement::Key("b"),
3698 StackElement::Index(2),
3699 StackElement::Key("c")]),
3700 (ObjectEnd, vec![StackElement::Key("b"),
3701 StackElement::Index(2)]),
3702 (ArrayEnd, vec![StackElement::Key("b")]),
3703 (ObjectEnd, vec![]),
3708 #[cfg_attr(target_pointer_width = "32", ignore)] // FIXME(#14064)
3709 fn test_read_array_streaming() {
3710 assert_stream_equal(
3713 (ArrayStart, vec![]),
3717 assert_stream_equal(
3720 (ArrayStart, vec![]),
3724 assert_stream_equal(
3727 (ArrayStart, vec![]),
3728 (BooleanValue(true), vec![StackElement::Index(0)]),
3732 assert_stream_equal(
3735 (ArrayStart, vec![]),
3736 (BooleanValue(false), vec![StackElement::Index(0)]),
3740 assert_stream_equal(
3743 (ArrayStart, vec![]),
3744 (NullValue, vec![StackElement::Index(0)]),
3748 assert_stream_equal(
3751 (ArrayStart, vec![]),
3752 (U64Value(3), vec![StackElement::Index(0)]),
3753 (U64Value(1), vec![StackElement::Index(1)]),
3757 assert_stream_equal(
3760 (ArrayStart, vec![]),
3761 (U64Value(3), vec![StackElement::Index(0)]),
3762 (U64Value(2), vec![StackElement::Index(1)]),
3766 assert_stream_equal(
3769 (ArrayStart, vec![]),
3770 (U64Value(2), vec![StackElement::Index(0)]),
3771 (ArrayStart, vec![StackElement::Index(1)]),
3772 (U64Value(4), vec![StackElement::Index(1), StackElement::Index(0)]),
3773 (U64Value(1), vec![StackElement::Index(1), StackElement::Index(1)]),
3774 (ArrayEnd, vec![StackElement::Index(1)]),
3779 assert_eq!(last_event("["), Error(SyntaxError(EOFWhileParsingValue, 1, 2)));
3781 assert_eq!(from_str("["), Err(SyntaxError(EOFWhileParsingValue, 1, 2)));
3782 assert_eq!(from_str("[1"), Err(SyntaxError(EOFWhileParsingArray, 1, 3)));
3783 assert_eq!(from_str("[1,"), Err(SyntaxError(EOFWhileParsingValue, 1, 4)));
3784 assert_eq!(from_str("[1,]"), Err(SyntaxError(InvalidSyntax, 1, 4)));
3785 assert_eq!(from_str("[6 7]"), Err(SyntaxError(InvalidSyntax, 1, 4)));
3789 fn test_trailing_characters_streaming() {
3790 assert_eq!(last_event("nulla"), Error(SyntaxError(TrailingCharacters, 1, 5)));
3791 assert_eq!(last_event("truea"), Error(SyntaxError(TrailingCharacters, 1, 5)));
3792 assert_eq!(last_event("falsea"), Error(SyntaxError(TrailingCharacters, 1, 6)));
3793 assert_eq!(last_event("1a"), Error(SyntaxError(TrailingCharacters, 1, 2)));
3794 assert_eq!(last_event("[]a"), Error(SyntaxError(TrailingCharacters, 1, 3)));
3795 assert_eq!(last_event("{}a"), Error(SyntaxError(TrailingCharacters, 1, 3)));
3798 fn test_read_identifiers_streaming() {
3799 assert_eq!(Parser::new("null".chars()).next(), Some(NullValue));
3800 assert_eq!(Parser::new("true".chars()).next(), Some(BooleanValue(true)));
3801 assert_eq!(Parser::new("false".chars()).next(), Some(BooleanValue(false)));
3803 assert_eq!(last_event("n"), Error(SyntaxError(InvalidSyntax, 1, 2)));
3804 assert_eq!(last_event("nul"), Error(SyntaxError(InvalidSyntax, 1, 4)));
3805 assert_eq!(last_event("t"), Error(SyntaxError(InvalidSyntax, 1, 2)));
3806 assert_eq!(last_event("truz"), Error(SyntaxError(InvalidSyntax, 1, 4)));
3807 assert_eq!(last_event("f"), Error(SyntaxError(InvalidSyntax, 1, 2)));
3808 assert_eq!(last_event("faz"), Error(SyntaxError(InvalidSyntax, 1, 3)));
3813 let mut stack = Stack::new();
3815 assert!(stack.is_empty());
3816 assert!(stack.len() == 0);
3817 assert!(!stack.last_is_index());
3819 stack.push_index(0);
3822 assert!(stack.len() == 1);
3823 assert!(stack.is_equal_to(&[StackElement::Index(1)]));
3824 assert!(stack.starts_with(&[StackElement::Index(1)]));
3825 assert!(stack.ends_with(&[StackElement::Index(1)]));
3826 assert!(stack.last_is_index());
3827 assert!(stack.get(0) == StackElement::Index(1));
3829 stack.push_key("foo".to_string());
3831 assert!(stack.len() == 2);
3832 assert!(stack.is_equal_to(&[StackElement::Index(1), StackElement::Key("foo")]));
3833 assert!(stack.starts_with(&[StackElement::Index(1), StackElement::Key("foo")]));
3834 assert!(stack.starts_with(&[StackElement::Index(1)]));
3835 assert!(stack.ends_with(&[StackElement::Index(1), StackElement::Key("foo")]));
3836 assert!(stack.ends_with(&[StackElement::Key("foo")]));
3837 assert!(!stack.last_is_index());
3838 assert!(stack.get(0) == StackElement::Index(1));
3839 assert!(stack.get(1) == StackElement::Key("foo"));
3841 stack.push_key("bar".to_string());
3843 assert!(stack.len() == 3);
3844 assert!(stack.is_equal_to(&[StackElement::Index(1),
3845 StackElement::Key("foo"),
3846 StackElement::Key("bar")]));
3847 assert!(stack.starts_with(&[StackElement::Index(1)]));
3848 assert!(stack.starts_with(&[StackElement::Index(1), StackElement::Key("foo")]));
3849 assert!(stack.starts_with(&[StackElement::Index(1),
3850 StackElement::Key("foo"),
3851 StackElement::Key("bar")]));
3852 assert!(stack.ends_with(&[StackElement::Key("bar")]));
3853 assert!(stack.ends_with(&[StackElement::Key("foo"), StackElement::Key("bar")]));
3854 assert!(stack.ends_with(&[StackElement::Index(1),
3855 StackElement::Key("foo"),
3856 StackElement::Key("bar")]));
3857 assert!(!stack.last_is_index());
3858 assert!(stack.get(0) == StackElement::Index(1));
3859 assert!(stack.get(1) == StackElement::Key("foo"));
3860 assert!(stack.get(2) == StackElement::Key("bar"));
3864 assert!(stack.len() == 2);
3865 assert!(stack.is_equal_to(&[StackElement::Index(1), StackElement::Key("foo")]));
3866 assert!(stack.starts_with(&[StackElement::Index(1), StackElement::Key("foo")]));
3867 assert!(stack.starts_with(&[StackElement::Index(1)]));
3868 assert!(stack.ends_with(&[StackElement::Index(1), StackElement::Key("foo")]));
3869 assert!(stack.ends_with(&[StackElement::Key("foo")]));
3870 assert!(!stack.last_is_index());
3871 assert!(stack.get(0) == StackElement::Index(1));
3872 assert!(stack.get(1) == StackElement::Key("foo"));
3877 use std::collections::{HashMap,BTreeMap};
3880 let array2 = Array(vec!(U64(1), U64(2)));
3881 let array3 = Array(vec!(U64(1), U64(2), U64(3)));
3883 let mut tree_map = BTreeMap::new();
3884 tree_map.insert("a".to_string(), U64(1));
3885 tree_map.insert("b".to_string(), U64(2));
3889 assert_eq!(array2.to_json(), array2);
3890 assert_eq!(object.to_json(), object);
3891 assert_eq!(3_i.to_json(), I64(3));
3892 assert_eq!(4_i8.to_json(), I64(4));
3893 assert_eq!(5_i16.to_json(), I64(5));
3894 assert_eq!(6_i32.to_json(), I64(6));
3895 assert_eq!(7_i64.to_json(), I64(7));
3896 assert_eq!(8_u.to_json(), U64(8));
3897 assert_eq!(9_u8.to_json(), U64(9));
3898 assert_eq!(10_u16.to_json(), U64(10));
3899 assert_eq!(11_u32.to_json(), U64(11));
3900 assert_eq!(12_u64.to_json(), U64(12));
3901 assert_eq!(13.0_f32.to_json(), F64(13.0_f64));
3902 assert_eq!(14.0_f64.to_json(), F64(14.0_f64));
3903 assert_eq!(().to_json(), Null);
3904 assert_eq!(f32::INFINITY.to_json(), Null);
3905 assert_eq!(f64::NAN.to_json(), Null);
3906 assert_eq!(true.to_json(), Boolean(true));
3907 assert_eq!(false.to_json(), Boolean(false));
3908 assert_eq!("abc".to_json(), String("abc".to_string()));
3909 assert_eq!("abc".to_string().to_json(), String("abc".to_string()));
3910 assert_eq!((1u, 2u).to_json(), array2);
3911 assert_eq!((1u, 2u, 3u).to_json(), array3);
3912 assert_eq!([1u, 2].to_json(), array2);
3913 assert_eq!((&[1u, 2, 3]).to_json(), array3);
3914 assert_eq!((vec![1u, 2]).to_json(), array2);
3915 assert_eq!(vec!(1u, 2, 3).to_json(), array3);
3916 let mut tree_map = BTreeMap::new();
3917 tree_map.insert("a".to_string(), 1u);
3918 tree_map.insert("b".to_string(), 2);
3919 assert_eq!(tree_map.to_json(), object);
3920 let mut hash_map = HashMap::new();
3921 hash_map.insert("a".to_string(), 1u);
3922 hash_map.insert("b".to_string(), 2);
3923 assert_eq!(hash_map.to_json(), object);
3924 assert_eq!(Some(15i).to_json(), I64(15));
3925 assert_eq!(Some(15u).to_json(), U64(15));
3926 assert_eq!(None::<int>.to_json(), Null);
3930 fn test_encode_hashmap_with_arbitrary_key() {
3931 use std::str::from_utf8;
3932 use std::io::Writer;
3933 use std::collections::HashMap;
3935 #[derive(PartialEq, Eq, Hash, RustcEncodable)]
3936 struct ArbitraryType(uint);
3937 let mut hm: HashMap<ArbitraryType, bool> = HashMap::new();
3938 hm.insert(ArbitraryType(1), true);
3939 let mut mem_buf = Vec::new();
3940 let mut encoder = Encoder::new(&mut mem_buf as &mut fmt::Writer);
3941 let result = hm.encode(&mut encoder);
3942 match result.err().unwrap() {
3943 EncoderError::BadHashmapKey => (),
3944 _ => panic!("expected bad hash map key")
3949 fn bench_streaming_small(b: &mut Bencher) {
3951 let mut parser = Parser::new(
3957 { "c": {"d": null} }
3962 match parser.next() {
3970 fn bench_small(b: &mut Bencher) {
3972 let _ = from_str(r#"{
3977 { "c": {"d": null} }
3983 fn big_json() -> string::String {
3984 let mut src = "[\n".to_string();
3985 for _ in range(0i, 500) {
3986 src.push_str(r#"{ "a": true, "b": null, "c":3.1415, "d": "Hello world", "e": \
3989 src.push_str("{}]");
3994 fn bench_streaming_large(b: &mut Bencher) {
3995 let src = big_json();
3997 let mut parser = Parser::new(src.chars());
3999 match parser.next() {
4007 fn bench_large(b: &mut Bencher) {
4008 let src = big_json();
4009 b.iter( || { let _ = from_str(src.as_slice()); });