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 //! # #![feature(rustc_private)]
81 //! extern crate serialize as rustc_serialize; // for the deriving below
82 //! use rustc_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).unwrap();
102 //! // Deserialize using `json::decode`
103 //! let decoded: TestStruct = json::decode(&encoded[..]).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 //! # #![feature(rustc_private)]
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+12.539i"};
152 //! ### Verbose example of `ToJson` usage
155 //! # #![feature(rustc_private)]
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).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::*;
202 use std::borrow::Cow;
203 use std::collections::{HashMap, BTreeMap};
204 use std::io::prelude::*;
207 use std::num::FpCategory as Fp;
209 use std::str::FromStr;
211 use std::{char, f64, fmt, str};
216 /// Represents a json value
217 #[derive(Clone, PartialEq, PartialOrd, Debug)]
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<usize> }
237 /// The errors that can arise while parsing a JSON stream.
238 #[derive(Clone, Copy, PartialEq, Debug)]
242 EOFWhileParsingObject,
243 EOFWhileParsingArray,
244 EOFWhileParsingValue,
245 EOFWhileParsingString,
251 InvalidUnicodeCodePoint,
252 LoneLeadingSurrogateInHexEscape,
253 UnexpectedEndOfHexEscape,
259 #[derive(Clone, PartialEq, Debug)]
260 pub enum ParserError {
262 SyntaxError(ErrorCode, usize, usize),
263 IoError(io::ErrorKind, String),
266 // Builder and Parser have the same errors.
267 pub type BuilderError = ParserError;
269 #[derive(Clone, PartialEq, Debug)]
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, Clone, Debug)]
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) -> Result<string::String, EncoderError> {
320 let mut s = String::new();
322 let mut encoder = Encoder::new(&mut s);
323 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::Error) -> ParserError {
335 IoError(io.kind(), io.to_string())
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 From<fmt::Error> for EncoderError {
368 /// Converts a [`fmt::Error`] into `EncoderError`
370 /// This conversion does not allocate memory.
371 fn from(err: fmt::Error) -> EncoderError { EncoderError::FmtError(err) }
374 pub type EncodeResult = Result<(), EncoderError>;
375 pub type DecodeResult<T> = Result<T, DecoderError>;
377 fn escape_str(wr: &mut dyn fmt::Write, v: &str) -> EncodeResult {
382 for (i, byte) in v.bytes().enumerate() {
383 let escaped = match byte {
386 b'\x00' => "\\u0000",
387 b'\x01' => "\\u0001",
388 b'\x02' => "\\u0002",
389 b'\x03' => "\\u0003",
390 b'\x04' => "\\u0004",
391 b'\x05' => "\\u0005",
392 b'\x06' => "\\u0006",
393 b'\x07' => "\\u0007",
397 b'\x0b' => "\\u000b",
400 b'\x0e' => "\\u000e",
401 b'\x0f' => "\\u000f",
402 b'\x10' => "\\u0010",
403 b'\x11' => "\\u0011",
404 b'\x12' => "\\u0012",
405 b'\x13' => "\\u0013",
406 b'\x14' => "\\u0014",
407 b'\x15' => "\\u0015",
408 b'\x16' => "\\u0016",
409 b'\x17' => "\\u0017",
410 b'\x18' => "\\u0018",
411 b'\x19' => "\\u0019",
412 b'\x1a' => "\\u001a",
413 b'\x1b' => "\\u001b",
414 b'\x1c' => "\\u001c",
415 b'\x1d' => "\\u001d",
416 b'\x1e' => "\\u001e",
417 b'\x1f' => "\\u001f",
418 b'\x7f' => "\\u007f",
423 wr.write_str(&v[start..i])?;
426 wr.write_str(escaped)?;
431 if start != v.len() {
432 wr.write_str(&v[start..])?;
439 fn escape_char(writer: &mut dyn fmt::Write, v: char) -> EncodeResult {
440 escape_str(writer, v.encode_utf8(&mut [0; 4]))
443 fn spaces(wr: &mut dyn fmt::Write, mut n: usize) -> EncodeResult {
444 const BUF: &str = " ";
446 while n >= BUF.len() {
452 wr.write_str(&BUF[..n])?;
457 fn fmt_number_or_null(v: f64) -> string::String {
459 Fp::Nan | Fp::Infinite => string::String::from("null"),
460 _ if v.fract() != 0f64 => v.to_string(),
461 _ => v.to_string() + ".0",
465 /// A structure for implementing serialization to JSON.
466 pub struct Encoder<'a> {
467 writer: &'a mut (dyn fmt::Write+'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 dyn fmt::Write) -> 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 $enc.is_emitting_map_key {
482 write!($enc.writer, "\"{}\"", $e)?;
484 write!($enc.writer, "{}", $e)?;
490 impl<'a> ::Encoder for Encoder<'a> {
491 type Error = EncoderError;
493 fn emit_nil(&mut self) -> EncodeResult {
494 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
495 write!(self.writer, "null")?;
499 fn emit_usize(&mut self, v: usize) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
500 fn emit_u128(&mut self, v: u128) -> 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_isize(&mut self, v: isize) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
507 fn emit_i128(&mut self, v: i128) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
508 fn emit_i64(&mut self, v: i64) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
509 fn emit_i32(&mut self, v: i32) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
510 fn emit_i16(&mut self, v: i16) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
511 fn emit_i8(&mut self, v: i8) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
513 fn emit_bool(&mut self, v: bool) -> EncodeResult {
514 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
516 write!(self.writer, "true")?;
518 write!(self.writer, "false")?;
523 fn emit_f64(&mut self, v: f64) -> EncodeResult {
524 emit_enquoted_if_mapkey!(self, fmt_number_or_null(v))
526 fn emit_f32(&mut self, v: f32) -> EncodeResult {
527 self.emit_f64(v as f64)
530 fn emit_char(&mut self, v: char) -> EncodeResult {
531 escape_char(self.writer, v)
533 fn emit_str(&mut self, v: &str) -> EncodeResult {
534 escape_str(self.writer, v)
537 fn emit_enum<F>(&mut self, _name: &str, f: F) -> EncodeResult where
538 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
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"]}
554 escape_str(self.writer, name)
556 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
557 write!(self.writer, "{{\"variant\":")?;
558 escape_str(self.writer, name)?;
559 write!(self.writer, ",\"fields\":[")?;
561 write!(self.writer, "]}}")?;
566 fn emit_enum_variant_arg<F>(&mut self, idx: usize, f: F) -> EncodeResult where
567 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
569 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
571 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, _: usize, f: F) -> EncodeResult where
598 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
600 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
601 write!(self.writer, "{{")?;
603 write!(self.writer, "}}")?;
607 fn emit_struct_field<F>(&mut self, name: &str, idx: usize, 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 { write!(self.writer, ",")?; }
612 escape_str(self.writer, name)?;
613 write!(self.writer, ":")?;
617 fn emit_tuple<F>(&mut self, len: usize, 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: usize, 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: usize, 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: usize, 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: usize, f: F) -> EncodeResult where
661 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
663 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
664 write!(self.writer, "[")?;
666 write!(self.writer, "]")?;
670 fn emit_seq_elt<F>(&mut self, idx: usize, f: F) -> EncodeResult where
671 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
673 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
675 write!(self.writer, ",")?;
680 fn emit_map<F>(&mut self, _len: usize, f: F) -> EncodeResult where
681 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
683 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
684 write!(self.writer, "{{")?;
686 write!(self.writer, "}}")?;
690 fn emit_map_elt_key<F>(&mut self, idx: usize, 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 { 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: usize, f: F) -> EncodeResult where
702 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
704 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
705 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 (dyn fmt::Write+'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 dyn fmt::Write) -> 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: usize) {
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 write!(self.writer, "null")?;
749 fn emit_usize(&mut self, v: usize) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
750 fn emit_u128(&mut self, v: u128) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
751 fn emit_u64(&mut self, v: u64) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
752 fn emit_u32(&mut self, v: u32) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
753 fn emit_u16(&mut self, v: u16) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
754 fn emit_u8(&mut self, v: u8) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
756 fn emit_isize(&mut self, v: isize) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
757 fn emit_i128(&mut self, v: i128) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
758 fn emit_i64(&mut self, v: i64) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
759 fn emit_i32(&mut self, v: i32) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
760 fn emit_i16(&mut self, v: i16) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
761 fn emit_i8(&mut self, v: i8) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
763 fn emit_bool(&mut self, v: bool) -> EncodeResult {
764 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
766 write!(self.writer, "true")?;
768 write!(self.writer, "false")?;
773 fn emit_f64(&mut self, v: f64) -> EncodeResult {
774 emit_enquoted_if_mapkey!(self, fmt_number_or_null(v))
776 fn emit_f32(&mut self, v: f32) -> EncodeResult {
777 self.emit_f64(v as f64)
780 fn emit_char(&mut self, v: char) -> EncodeResult {
781 escape_char(self.writer, v)
783 fn emit_str(&mut self, v: &str) -> EncodeResult {
784 escape_str(self.writer, v)
787 fn emit_enum<F>(&mut self, _name: &str, f: F) -> EncodeResult where
788 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
793 fn emit_enum_variant<F>(&mut self,
798 -> EncodeResult where
799 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
802 escape_str(self.writer, name)
804 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
805 writeln!(self.writer, "{{")?;
806 self.curr_indent += self.indent;
807 spaces(self.writer, self.curr_indent)?;
808 write!(self.writer, "\"variant\": ")?;
809 escape_str(self.writer, name)?;
810 writeln!(self.writer, ",")?;
811 spaces(self.writer, self.curr_indent)?;
812 writeln!(self.writer, "\"fields\": [")?;
813 self.curr_indent += self.indent;
815 self.curr_indent -= self.indent;
816 writeln!(self.writer)?;
817 spaces(self.writer, self.curr_indent)?;
818 self.curr_indent -= self.indent;
819 writeln!(self.writer, "]")?;
820 spaces(self.writer, self.curr_indent)?;
821 write!(self.writer, "}}")?;
826 fn emit_enum_variant_arg<F>(&mut self, idx: usize, f: F) -> EncodeResult where
827 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
829 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
831 writeln!(self.writer, ",")?;
833 spaces(self.writer, self.curr_indent)?;
837 fn emit_enum_struct_variant<F>(&mut self,
841 f: F) -> EncodeResult where
842 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
844 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
845 self.emit_enum_variant(name, id, cnt, f)
848 fn emit_enum_struct_variant_field<F>(&mut self,
851 f: F) -> EncodeResult where
852 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
854 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
855 self.emit_enum_variant_arg(idx, f)
859 fn emit_struct<F>(&mut self, _: &str, len: usize, f: F) -> EncodeResult where
860 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
862 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
864 write!(self.writer, "{{}}")?;
866 write!(self.writer, "{{")?;
867 self.curr_indent += self.indent;
869 self.curr_indent -= self.indent;
870 writeln!(self.writer)?;
871 spaces(self.writer, self.curr_indent)?;
872 write!(self.writer, "}}")?;
877 fn emit_struct_field<F>(&mut self, name: &str, idx: usize, f: F) -> EncodeResult where
878 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
880 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
882 writeln!(self.writer)?;
884 writeln!(self.writer, ",")?;
886 spaces(self.writer, self.curr_indent)?;
887 escape_str(self.writer, name)?;
888 write!(self.writer, ": ")?;
892 fn emit_tuple<F>(&mut self, len: usize, f: F) -> EncodeResult where
893 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
895 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
896 self.emit_seq(len, f)
898 fn emit_tuple_arg<F>(&mut self, idx: usize, f: F) -> EncodeResult where
899 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
901 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
902 self.emit_seq_elt(idx, f)
905 fn emit_tuple_struct<F>(&mut self, _: &str, len: usize, f: F) -> EncodeResult where
906 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
908 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
909 self.emit_seq(len, f)
911 fn emit_tuple_struct_arg<F>(&mut self, idx: usize, f: F) -> EncodeResult where
912 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
914 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
915 self.emit_seq_elt(idx, f)
918 fn emit_option<F>(&mut self, f: F) -> EncodeResult where
919 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
921 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
924 fn emit_option_none(&mut self) -> EncodeResult {
925 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
928 fn emit_option_some<F>(&mut self, f: F) -> EncodeResult where
929 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
931 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
935 fn emit_seq<F>(&mut self, len: usize, f: F) -> EncodeResult where
936 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
938 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
940 write!(self.writer, "[]")?;
942 write!(self.writer, "[")?;
943 self.curr_indent += self.indent;
945 self.curr_indent -= self.indent;
946 writeln!(self.writer)?;
947 spaces(self.writer, self.curr_indent)?;
948 write!(self.writer, "]")?;
953 fn emit_seq_elt<F>(&mut self, idx: usize, f: F) -> EncodeResult where
954 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
956 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
958 writeln!(self.writer)?;
960 writeln!(self.writer, ",")?;
962 spaces(self.writer, self.curr_indent)?;
966 fn emit_map<F>(&mut self, len: usize, f: F) -> EncodeResult where
967 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
969 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
971 write!(self.writer, "{{}}")?;
973 write!(self.writer, "{{")?;
974 self.curr_indent += self.indent;
976 self.curr_indent -= self.indent;
977 writeln!(self.writer)?;
978 spaces(self.writer, self.curr_indent)?;
979 write!(self.writer, "}}")?;
984 fn emit_map_elt_key<F>(&mut self, idx: usize, f: F) -> EncodeResult where
985 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
987 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
989 writeln!(self.writer)?;
991 writeln!(self.writer, ",")?;
993 spaces(self.writer, self.curr_indent)?;
994 self.is_emitting_map_key = true;
996 self.is_emitting_map_key = false;
1000 fn emit_map_elt_val<F>(&mut self, _idx: usize, f: F) -> EncodeResult where
1001 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
1003 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
1004 write!(self.writer, ": ")?;
1009 impl Encodable for Json {
1010 fn encode<E: ::Encoder>(&self, e: &mut E) -> Result<(), E::Error> {
1012 Json::I64(v) => v.encode(e),
1013 Json::U64(v) => v.encode(e),
1014 Json::F64(v) => v.encode(e),
1015 Json::String(ref v) => v.encode(e),
1016 Json::Boolean(v) => v.encode(e),
1017 Json::Array(ref v) => v.encode(e),
1018 Json::Object(ref v) => v.encode(e),
1019 Json::Null => e.emit_nil(),
1024 /// Create an `AsJson` wrapper which can be used to print a value as JSON
1025 /// on-the-fly via `write!`
1026 pub fn as_json<T>(t: &T) -> AsJson<T> {
1030 /// Create an `AsPrettyJson` wrapper which can be used to print a value as JSON
1031 /// on-the-fly via `write!`
1032 pub fn as_pretty_json<T>(t: &T) -> AsPrettyJson<T> {
1033 AsPrettyJson { inner: t, indent: None }
1037 /// Borrow this json object as a pretty object to generate a pretty
1038 /// representation for it via `Display`.
1039 pub fn pretty(&self) -> PrettyJson {
1040 PrettyJson { inner: self }
1043 /// If the Json value is an Object, returns the value associated with the provided key.
1044 /// Otherwise, returns None.
1045 pub fn find<'a>(&'a self, key: &str) -> Option<&'a Json>{
1047 Json::Object(ref map) => map.get(key),
1052 /// Attempts to get a nested Json Object for each key in `keys`.
1053 /// If any key is found not to exist, find_path will return None.
1054 /// Otherwise, it will return the Json value associated with the final key.
1055 pub fn find_path<'a>(&'a self, keys: &[&str]) -> Option<&'a Json>{
1056 let mut target = self;
1058 target = target.find(*key)?;
1063 /// If the Json value is an Object, performs a depth-first search until
1064 /// a value associated with the provided key is found. If no value is found
1065 /// or the Json value is not an Object, returns None.
1066 pub fn search<'a>(&'a self, key: &str) -> Option<&'a Json> {
1068 &Json::Object(ref map) => {
1069 match map.get(key) {
1070 Some(json_value) => Some(json_value),
1073 match v.search(key) {
1074 x if x.is_some() => return x,
1086 /// Returns true if the Json value is an Object. Returns false otherwise.
1087 pub fn is_object(&self) -> bool {
1088 self.as_object().is_some()
1091 /// If the Json value is an Object, returns the associated BTreeMap.
1092 /// Returns None otherwise.
1093 pub fn as_object(&self) -> Option<&Object> {
1095 Json::Object(ref map) => Some(map),
1100 /// Returns true if the Json value is an Array. Returns false otherwise.
1101 pub fn is_array(&self) -> bool {
1102 self.as_array().is_some()
1105 /// If the Json value is an Array, returns the associated vector.
1106 /// Returns None otherwise.
1107 pub fn as_array(&self) -> Option<&Array> {
1109 Json::Array(ref array) => Some(&*array),
1114 /// Returns true if the Json value is a String. Returns false otherwise.
1115 pub fn is_string(&self) -> bool {
1116 self.as_string().is_some()
1119 /// If the Json value is a String, returns the associated str.
1120 /// Returns None otherwise.
1121 pub fn as_string(&self) -> Option<&str> {
1123 Json::String(ref s) => Some(&s[..]),
1128 /// Returns true if the Json value is a Number. Returns false otherwise.
1129 pub fn is_number(&self) -> bool {
1131 Json::I64(_) | Json::U64(_) | Json::F64(_) => true,
1136 /// Returns true if the Json value is a i64. Returns false otherwise.
1137 pub fn is_i64(&self) -> bool {
1139 Json::I64(_) => true,
1144 /// Returns true if the Json value is a u64. Returns false otherwise.
1145 pub fn is_u64(&self) -> bool {
1147 Json::U64(_) => true,
1152 /// Returns true if the Json value is a f64. Returns false otherwise.
1153 pub fn is_f64(&self) -> bool {
1155 Json::F64(_) => true,
1160 /// If the Json value is a number, return or cast it to a i64.
1161 /// Returns None otherwise.
1162 pub fn as_i64(&self) -> Option<i64> {
1164 Json::I64(n) => Some(n),
1165 Json::U64(n) => Some(n as i64),
1170 /// If the Json value is a number, return or cast it to a u64.
1171 /// Returns None otherwise.
1172 pub fn as_u64(&self) -> Option<u64> {
1174 Json::I64(n) => Some(n as u64),
1175 Json::U64(n) => Some(n),
1180 /// If the Json value is a number, return or cast it to a f64.
1181 /// Returns None otherwise.
1182 pub fn as_f64(&self) -> Option<f64> {
1184 Json::I64(n) => Some(n as f64),
1185 Json::U64(n) => Some(n as f64),
1186 Json::F64(n) => Some(n),
1191 /// Returns true if the Json value is a Boolean. Returns false otherwise.
1192 pub fn is_boolean(&self) -> bool {
1193 self.as_boolean().is_some()
1196 /// If the Json value is a Boolean, returns the associated bool.
1197 /// Returns None otherwise.
1198 pub fn as_boolean(&self) -> Option<bool> {
1200 Json::Boolean(b) => Some(b),
1205 /// Returns true if the Json value is a Null. Returns false otherwise.
1206 pub fn is_null(&self) -> bool {
1207 self.as_null().is_some()
1210 /// If the Json value is a Null, returns ().
1211 /// Returns None otherwise.
1212 pub fn as_null(&self) -> Option<()> {
1214 Json::Null => Some(()),
1220 impl<'a> Index<&'a str> for Json {
1223 fn index(&self, idx: &'a str) -> &Json {
1224 self.find(idx).unwrap()
1228 impl Index<usize> for Json {
1231 fn index(&self, idx: usize) -> &Json {
1233 Json::Array(ref v) => &v[idx],
1234 _ => panic!("can only index Json with usize if it is an array")
1239 /// The output of the streaming parser.
1240 #[derive(PartialEq, Clone, Debug)]
1241 pub enum JsonEvent {
1250 StringValue(string::String),
1255 #[derive(PartialEq, Debug)]
1257 // Parse a value in an array, true means first element.
1259 // Parse ',' or ']' after an element in an array.
1261 // Parse a key:value in an object, true means first element.
1263 // Parse ',' or ']' after an element in an object.
1267 // Expecting the stream to end.
1269 // Parsing can't continue.
1273 /// A Stack represents the current position of the parser in the logical
1274 /// structure of the JSON stream.
1275 /// For example foo.bar[3].x
1277 stack: Vec<InternalStackElement>,
1278 str_buffer: Vec<u8>,
1281 /// StackElements compose a Stack.
1282 /// For example, StackElement::Key("foo"), StackElement::Key("bar"),
1283 /// StackElement::Index(3) and StackElement::Key("x") are the
1284 /// StackElements compositing the stack that represents foo.bar[3].x
1285 #[derive(PartialEq, Clone, Debug)]
1286 pub enum StackElement<'l> {
1291 // Internally, Key elements are stored as indices in a buffer to avoid
1292 // allocating a string for every member of an object.
1293 #[derive(PartialEq, Clone, Debug)]
1294 enum InternalStackElement {
1296 InternalKey(u16, u16), // start, size
1300 pub fn new() -> Stack {
1301 Stack { stack: Vec::new(), str_buffer: Vec::new() }
1304 /// Returns The number of elements in the Stack.
1305 pub fn len(&self) -> usize { self.stack.len() }
1307 /// Returns true if the stack is empty.
1308 pub fn is_empty(&self) -> bool { self.stack.is_empty() }
1310 /// Provides access to the StackElement at a given index.
1311 /// lower indices are at the bottom of the stack while higher indices are
1313 pub fn get(&self, idx: usize) -> StackElement {
1314 match self.stack[idx] {
1315 InternalIndex(i) => StackElement::Index(i),
1316 InternalKey(start, size) => {
1317 StackElement::Key(str::from_utf8(
1318 &self.str_buffer[start as usize .. start as usize + size as usize])
1324 /// Compares this stack with an array of StackElements.
1325 pub fn is_equal_to(&self, rhs: &[StackElement]) -> bool {
1326 if self.stack.len() != rhs.len() { return false; }
1327 for (i, r) in rhs.iter().enumerate() {
1328 if self.get(i) != *r { return false; }
1333 /// Returns true if the bottom-most elements of this stack are the same as
1334 /// the ones passed as parameter.
1335 pub fn starts_with(&self, rhs: &[StackElement]) -> bool {
1336 if self.stack.len() < rhs.len() { return false; }
1337 for (i, r) in rhs.iter().enumerate() {
1338 if self.get(i) != *r { return false; }
1343 /// Returns true if the top-most elements of this stack are the same as
1344 /// the ones passed as parameter.
1345 pub fn ends_with(&self, rhs: &[StackElement]) -> bool {
1346 if self.stack.len() < rhs.len() { return false; }
1347 let offset = self.stack.len() - rhs.len();
1348 for (i, r) in rhs.iter().enumerate() {
1349 if self.get(i + offset) != *r { return false; }
1354 /// Returns the top-most element (if any).
1355 pub fn top(&self) -> Option<StackElement> {
1356 match self.stack.last() {
1358 Some(&InternalIndex(i)) => Some(StackElement::Index(i)),
1359 Some(&InternalKey(start, size)) => {
1360 Some(StackElement::Key(str::from_utf8(
1361 &self.str_buffer[start as usize .. (start+size) as usize]
1367 // Used by Parser to insert StackElement::Key elements at the top of the stack.
1368 fn push_key(&mut self, key: string::String) {
1369 self.stack.push(InternalKey(self.str_buffer.len() as u16, key.len() as u16));
1370 self.str_buffer.extend(key.as_bytes());
1373 // Used by Parser to insert StackElement::Index elements at the top of the stack.
1374 fn push_index(&mut self, index: u32) {
1375 self.stack.push(InternalIndex(index));
1378 // Used by Parser to remove the top-most element of the stack.
1380 assert!(!self.is_empty());
1381 match *self.stack.last().unwrap() {
1382 InternalKey(_, sz) => {
1383 let new_size = self.str_buffer.len() - sz as usize;
1384 self.str_buffer.truncate(new_size);
1386 InternalIndex(_) => {}
1391 // Used by Parser to test whether the top-most element is an index.
1392 fn last_is_index(&self) -> bool {
1393 match self.stack.last() {
1394 Some(InternalIndex(_)) => true,
1399 // Used by Parser to increment the index of the top-most element.
1400 fn bump_index(&mut self) {
1401 let len = self.stack.len();
1402 let idx = match *self.stack.last().unwrap() {
1403 InternalIndex(i) => { i + 1 }
1406 self.stack[len - 1] = InternalIndex(idx);
1410 /// A streaming JSON parser implemented as an iterator of JsonEvent, consuming
1411 /// an iterator of char.
1412 pub struct Parser<T> {
1417 // We maintain a stack representing where we are in the logical structure
1418 // of the JSON stream.
1420 // A state machine is kept to make it possible to interrupt and resume parsing.
1424 impl<T: Iterator<Item=char>> Iterator for Parser<T> {
1425 type Item = JsonEvent;
1427 fn next(&mut self) -> Option<JsonEvent> {
1428 if self.state == ParseFinished {
1432 if self.state == ParseBeforeFinish {
1433 self.parse_whitespace();
1434 // Make sure there is no trailing characters.
1436 self.state = ParseFinished;
1439 return Some(self.error_event(TrailingCharacters));
1447 impl<T: Iterator<Item=char>> Parser<T> {
1448 /// Creates the JSON parser.
1449 pub fn new(rdr: T) -> Parser<T> {
1450 let mut p = Parser {
1455 stack: Stack::new(),
1462 /// Provides access to the current position in the logical structure of the
1464 pub fn stack(&self) -> &Stack {
1468 fn eof(&self) -> bool { self.ch.is_none() }
1469 fn ch_or_null(&self) -> char { self.ch.unwrap_or('\x00') }
1470 fn bump(&mut self) {
1471 self.ch = self.rdr.next();
1473 if self.ch_is('\n') {
1481 fn next_char(&mut self) -> Option<char> {
1485 fn ch_is(&self, c: char) -> bool {
1489 fn error<U>(&self, reason: ErrorCode) -> Result<U, ParserError> {
1490 Err(SyntaxError(reason, self.line, self.col))
1493 fn parse_whitespace(&mut self) {
1494 while self.ch_is(' ') ||
1497 self.ch_is('\r') { self.bump(); }
1500 fn parse_number(&mut self) -> JsonEvent {
1501 let mut neg = false;
1503 if self.ch_is('-') {
1508 let res = match self.parse_u64() {
1510 Err(e) => { return Error(e); }
1513 if self.ch_is('.') || self.ch_is('e') || self.ch_is('E') {
1514 let mut res = res as f64;
1516 if self.ch_is('.') {
1517 res = match self.parse_decimal(res) {
1519 Err(e) => { return Error(e); }
1523 if self.ch_is('e') || self.ch_is('E') {
1524 res = match self.parse_exponent(res) {
1526 Err(e) => { return Error(e); }
1536 let res = (res as i64).wrapping_neg();
1538 // Make sure we didn't underflow.
1540 Error(SyntaxError(InvalidNumber, self.line, self.col))
1549 fn parse_u64(&mut self) -> Result<u64, ParserError> {
1550 let mut accum = 0u64;
1551 let last_accum = 0; // necessary to detect overflow.
1553 match self.ch_or_null() {
1557 // A leading '0' must be the only digit before the decimal point.
1558 if let '0' ..= '9' = self.ch_or_null() {
1559 return self.error(InvalidNumber)
1564 match self.ch_or_null() {
1565 c @ '0' ..= '9' => {
1566 accum = accum.wrapping_mul(10);
1567 accum = accum.wrapping_add((c as u64) - ('0' as u64));
1569 // Detect overflow by comparing to the last value.
1570 if accum <= last_accum { return self.error(InvalidNumber); }
1578 _ => return self.error(InvalidNumber),
1584 fn parse_decimal(&mut self, mut res: f64) -> Result<f64, ParserError> {
1587 // Make sure a digit follows the decimal place.
1588 match self.ch_or_null() {
1590 _ => return self.error(InvalidNumber)
1595 match self.ch_or_null() {
1596 c @ '0' ..= '9' => {
1598 res += (((c as isize) - ('0' as isize)) as f64) * dec;
1608 fn parse_exponent(&mut self, mut res: f64) -> Result<f64, ParserError> {
1612 let mut neg_exp = false;
1614 if self.ch_is('+') {
1616 } else if self.ch_is('-') {
1621 // Make sure a digit follows the exponent place.
1622 match self.ch_or_null() {
1624 _ => return self.error(InvalidNumber)
1627 match self.ch_or_null() {
1628 c @ '0' ..= '9' => {
1630 exp += (c as usize) - ('0' as usize);
1638 let exp = 10_f64.powi(exp as i32);
1648 fn decode_hex_escape(&mut self) -> Result<u16, ParserError> {
1651 while i < 4 && !self.eof() {
1653 n = match self.ch_or_null() {
1654 c @ '0' ..= '9' => n * 16 + ((c as u16) - ('0' as u16)),
1655 'a' | 'A' => n * 16 + 10,
1656 'b' | 'B' => n * 16 + 11,
1657 'c' | 'C' => n * 16 + 12,
1658 'd' | 'D' => n * 16 + 13,
1659 'e' | 'E' => n * 16 + 14,
1660 'f' | 'F' => n * 16 + 15,
1661 _ => return self.error(InvalidEscape)
1667 // Error out if we didn't parse 4 digits.
1669 return self.error(InvalidEscape);
1675 fn parse_str(&mut self) -> Result<string::String, ParserError> {
1676 let mut escape = false;
1677 let mut res = string::String::new();
1682 return self.error(EOFWhileParsingString);
1686 match self.ch_or_null() {
1687 '"' => res.push('"'),
1688 '\\' => res.push('\\'),
1689 '/' => res.push('/'),
1690 'b' => res.push('\x08'),
1691 'f' => res.push('\x0c'),
1692 'n' => res.push('\n'),
1693 'r' => res.push('\r'),
1694 't' => res.push('\t'),
1695 'u' => match self.decode_hex_escape()? {
1696 0xDC00 ..= 0xDFFF => {
1697 return self.error(LoneLeadingSurrogateInHexEscape)
1700 // Non-BMP characters are encoded as a sequence of
1701 // two hex escapes, representing UTF-16 surrogates.
1702 n1 @ 0xD800 ..= 0xDBFF => {
1703 match (self.next_char(), self.next_char()) {
1704 (Some('\\'), Some('u')) => (),
1705 _ => return self.error(UnexpectedEndOfHexEscape),
1708 let n2 = self.decode_hex_escape()?;
1709 if n2 < 0xDC00 || n2 > 0xDFFF {
1710 return self.error(LoneLeadingSurrogateInHexEscape)
1712 let c = (((n1 - 0xD800) as u32) << 10 |
1713 (n2 - 0xDC00) as u32) + 0x1_0000;
1714 res.push(char::from_u32(c).unwrap());
1717 n => match char::from_u32(n as u32) {
1718 Some(c) => res.push(c),
1719 None => return self.error(InvalidUnicodeCodePoint),
1722 _ => return self.error(InvalidEscape),
1725 } else if self.ch_is('\\') {
1733 Some(c) => res.push(c),
1734 None => unreachable!()
1740 // Invoked at each iteration, consumes the stream until it has enough
1741 // information to return a JsonEvent.
1742 // Manages an internal state so that parsing can be interrupted and resumed.
1743 // Also keeps track of the position in the logical structure of the json
1744 // stream isize the form of a stack that can be queried by the user using the
1746 fn parse(&mut self) -> JsonEvent {
1748 // The only paths where the loop can spin a new iteration
1749 // are in the cases ParseArrayComma and ParseObjectComma if ','
1750 // is parsed. In these cases the state is set to (respectively)
1751 // ParseArray(false) and ParseObject(false), which always return,
1752 // so there is no risk of getting stuck in an infinite loop.
1753 // All other paths return before the end of the loop's iteration.
1754 self.parse_whitespace();
1758 return self.parse_start();
1760 ParseArray(first) => {
1761 return self.parse_array(first);
1763 ParseArrayComma => {
1764 if let Some(evt) = self.parse_array_comma_or_end() {
1768 ParseObject(first) => {
1769 return self.parse_object(first);
1771 ParseObjectComma => {
1773 if self.ch_is(',') {
1774 self.state = ParseObject(false);
1777 return self.parse_object_end();
1781 return self.error_event(InvalidSyntax);
1787 fn parse_start(&mut self) -> JsonEvent {
1788 let val = self.parse_value();
1789 self.state = match val {
1790 Error(_) => ParseFinished,
1791 ArrayStart => ParseArray(true),
1792 ObjectStart => ParseObject(true),
1793 _ => ParseBeforeFinish,
1798 fn parse_array(&mut self, first: bool) -> JsonEvent {
1799 if self.ch_is(']') {
1801 self.error_event(InvalidSyntax)
1803 self.state = if self.stack.is_empty() {
1805 } else if self.stack.last_is_index() {
1815 self.stack.push_index(0);
1817 let val = self.parse_value();
1818 self.state = match val {
1819 Error(_) => ParseFinished,
1820 ArrayStart => ParseArray(true),
1821 ObjectStart => ParseObject(true),
1822 _ => ParseArrayComma,
1828 fn parse_array_comma_or_end(&mut self) -> Option<JsonEvent> {
1829 if self.ch_is(',') {
1830 self.stack.bump_index();
1831 self.state = ParseArray(false);
1834 } else if self.ch_is(']') {
1836 self.state = if self.stack.is_empty() {
1838 } else if self.stack.last_is_index() {
1845 } else if self.eof() {
1846 Some(self.error_event(EOFWhileParsingArray))
1848 Some(self.error_event(InvalidSyntax))
1852 fn parse_object(&mut self, first: bool) -> JsonEvent {
1853 if self.ch_is('}') {
1855 if self.stack.is_empty() {
1856 return self.error_event(TrailingComma);
1861 self.state = if self.stack.is_empty() {
1863 } else if self.stack.last_is_index() {
1872 return self.error_event(EOFWhileParsingObject);
1874 if !self.ch_is('"') {
1875 return self.error_event(KeyMustBeAString);
1877 let s = match self.parse_str() {
1880 self.state = ParseFinished;
1884 self.parse_whitespace();
1886 return self.error_event(EOFWhileParsingObject);
1887 } else if self.ch_or_null() != ':' {
1888 return self.error_event(ExpectedColon);
1890 self.stack.push_key(s);
1892 self.parse_whitespace();
1894 let val = self.parse_value();
1896 self.state = match val {
1897 Error(_) => ParseFinished,
1898 ArrayStart => ParseArray(true),
1899 ObjectStart => ParseObject(true),
1900 _ => ParseObjectComma,
1905 fn parse_object_end(&mut self) -> JsonEvent {
1906 if self.ch_is('}') {
1907 self.state = if self.stack.is_empty() {
1909 } else if self.stack.last_is_index() {
1916 } else if self.eof() {
1917 self.error_event(EOFWhileParsingObject)
1919 self.error_event(InvalidSyntax)
1923 fn parse_value(&mut self) -> JsonEvent {
1924 if self.eof() { return self.error_event(EOFWhileParsingValue); }
1925 match self.ch_or_null() {
1926 'n' => { self.parse_ident("ull", NullValue) }
1927 't' => { self.parse_ident("rue", BooleanValue(true)) }
1928 'f' => { self.parse_ident("alse", BooleanValue(false)) }
1929 '0' ..= '9' | '-' => self.parse_number(),
1930 '"' => match self.parse_str() {
1931 Ok(s) => StringValue(s),
1942 _ => { self.error_event(InvalidSyntax) }
1946 fn parse_ident(&mut self, ident: &str, value: JsonEvent) -> JsonEvent {
1947 if ident.chars().all(|c| Some(c) == self.next_char()) {
1951 Error(SyntaxError(InvalidSyntax, self.line, self.col))
1955 fn error_event(&mut self, reason: ErrorCode) -> JsonEvent {
1956 self.state = ParseFinished;
1957 Error(SyntaxError(reason, self.line, self.col))
1961 /// A Builder consumes a json::Parser to create a generic Json structure.
1962 pub struct Builder<T> {
1964 token: Option<JsonEvent>,
1967 impl<T: Iterator<Item=char>> Builder<T> {
1968 /// Create a JSON Builder.
1969 pub fn new(src: T) -> Builder<T> {
1970 Builder { parser: Parser::new(src), token: None, }
1973 // Decode a Json value from a Parser.
1974 pub fn build(&mut self) -> Result<Json, BuilderError> {
1976 let result = self.build_value();
1980 Some(Error(ref e)) => { return Err(e.clone()); }
1981 ref tok => { panic!("unexpected token {:?}", tok.clone()); }
1986 fn bump(&mut self) {
1987 self.token = self.parser.next();
1990 fn build_value(&mut self) -> Result<Json, BuilderError> {
1992 Some(NullValue) => Ok(Json::Null),
1993 Some(I64Value(n)) => Ok(Json::I64(n)),
1994 Some(U64Value(n)) => Ok(Json::U64(n)),
1995 Some(F64Value(n)) => Ok(Json::F64(n)),
1996 Some(BooleanValue(b)) => Ok(Json::Boolean(b)),
1997 Some(StringValue(ref mut s)) => {
1998 let mut temp = string::String::new();
2000 Ok(Json::String(temp))
2002 Some(Error(ref e)) => Err(e.clone()),
2003 Some(ArrayStart) => self.build_array(),
2004 Some(ObjectStart) => self.build_object(),
2005 Some(ObjectEnd) => self.parser.error(InvalidSyntax),
2006 Some(ArrayEnd) => self.parser.error(InvalidSyntax),
2007 None => self.parser.error(EOFWhileParsingValue),
2011 fn build_array(&mut self) -> Result<Json, BuilderError> {
2013 let mut values = Vec::new();
2016 if self.token == Some(ArrayEnd) {
2017 return Ok(Json::Array(values.into_iter().collect()));
2019 match self.build_value() {
2020 Ok(v) => values.push(v),
2021 Err(e) => { return Err(e) }
2027 fn build_object(&mut self) -> Result<Json, BuilderError> {
2030 let mut values = BTreeMap::new();
2034 Some(ObjectEnd) => { return Ok(Json::Object(values)); }
2035 Some(Error(ref e)) => { return Err(e.clone()); }
2039 let key = match self.parser.stack().top() {
2040 Some(StackElement::Key(k)) => { k.to_owned() }
2041 _ => { panic!("invalid state"); }
2043 match self.build_value() {
2044 Ok(value) => { values.insert(key, value); }
2045 Err(e) => { return Err(e); }
2049 self.parser.error(EOFWhileParsingObject)
2053 /// Decodes a json value from an `&mut io::Read`
2054 pub fn from_reader(rdr: &mut dyn Read) -> Result<Json, BuilderError> {
2055 let mut contents = Vec::new();
2056 match rdr.read_to_end(&mut contents) {
2058 Err(e) => return Err(io_error_to_error(e))
2060 let s = match str::from_utf8(&contents).ok() {
2062 _ => return Err(SyntaxError(NotUtf8, 0, 0))
2064 let mut builder = Builder::new(s.chars());
2068 /// Decodes a json value from a string
2069 pub fn from_str(s: &str) -> Result<Json, BuilderError> {
2070 let mut builder = Builder::new(s.chars());
2074 /// A structure to decode JSON to values in rust.
2075 pub struct Decoder {
2080 /// Creates a new decoder instance for decoding the specified JSON value.
2081 pub fn new(json: Json) -> Decoder {
2082 Decoder { stack: vec![json] }
2085 fn pop(&mut self) -> Json {
2086 self.stack.pop().unwrap()
2090 macro_rules! expect {
2091 ($e:expr, Null) => ({
2093 Json::Null => Ok(()),
2094 other => Err(ExpectedError("Null".to_owned(),
2098 ($e:expr, $t:ident) => ({
2100 Json::$t(v) => Ok(v),
2102 Err(ExpectedError(stringify!($t).to_owned(),
2109 macro_rules! read_primitive {
2110 ($name:ident, $ty:ty) => {
2111 fn $name(&mut self) -> DecodeResult<$ty> {
2113 Json::I64(f) => Ok(f as $ty),
2114 Json::U64(f) => Ok(f as $ty),
2115 Json::F64(f) => Err(ExpectedError("Integer".to_owned(), f.to_string())),
2116 // re: #12967.. a type w/ numeric keys (ie HashMap<usize, V> etc)
2117 // is going to have a string here, as per JSON spec.
2118 Json::String(s) => match s.parse().ok() {
2120 None => Err(ExpectedError("Number".to_owned(), s)),
2122 value => Err(ExpectedError("Number".to_owned(), value.to_string())),
2128 impl ::Decoder for Decoder {
2129 type Error = DecoderError;
2131 fn read_nil(&mut self) -> DecodeResult<()> {
2132 expect!(self.pop(), Null)
2135 read_primitive! { read_usize, usize }
2136 read_primitive! { read_u8, u8 }
2137 read_primitive! { read_u16, u16 }
2138 read_primitive! { read_u32, u32 }
2139 read_primitive! { read_u64, u64 }
2140 read_primitive! { read_u128, u128 }
2141 read_primitive! { read_isize, isize }
2142 read_primitive! { read_i8, i8 }
2143 read_primitive! { read_i16, i16 }
2144 read_primitive! { read_i32, i32 }
2145 read_primitive! { read_i64, i64 }
2146 read_primitive! { read_i128, i128 }
2148 fn read_f32(&mut self) -> DecodeResult<f32> { self.read_f64().map(|x| x as f32) }
2150 fn read_f64(&mut self) -> DecodeResult<f64> {
2152 Json::I64(f) => Ok(f as f64),
2153 Json::U64(f) => Ok(f as f64),
2154 Json::F64(f) => Ok(f),
2155 Json::String(s) => {
2156 // re: #12967.. a type w/ numeric keys (ie HashMap<usize, V> etc)
2157 // is going to have a string here, as per JSON spec.
2158 match s.parse().ok() {
2160 None => Err(ExpectedError("Number".to_owned(), s)),
2163 Json::Null => Ok(f64::NAN),
2164 value => Err(ExpectedError("Number".to_owned(), value.to_string()))
2168 fn read_bool(&mut self) -> DecodeResult<bool> {
2169 expect!(self.pop(), Boolean)
2172 fn read_char(&mut self) -> DecodeResult<char> {
2173 let s = self.read_str()?;
2175 let mut it = s.chars();
2176 match (it.next(), it.next()) {
2177 // exactly one character
2178 (Some(c), None) => return Ok(c),
2182 Err(ExpectedError("single character string".to_owned(), s.to_string()))
2185 fn read_str(&mut self) -> DecodeResult<Cow<str>> {
2186 expect!(self.pop(), String).map(Cow::Owned)
2189 fn read_enum<T, F>(&mut self, _name: &str, f: F) -> DecodeResult<T> where
2190 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2195 fn read_enum_variant<T, F>(&mut self, names: &[&str],
2196 mut f: F) -> DecodeResult<T>
2197 where F: FnMut(&mut Decoder, usize) -> DecodeResult<T>,
2199 let name = match self.pop() {
2200 Json::String(s) => s,
2201 Json::Object(mut o) => {
2202 let n = match o.remove(&"variant".to_owned()) {
2203 Some(Json::String(s)) => s,
2205 return Err(ExpectedError("String".to_owned(), val.to_string()))
2208 return Err(MissingFieldError("variant".to_owned()))
2211 match o.remove(&"fields".to_string()) {
2212 Some(Json::Array(l)) => {
2213 self.stack.extend(l.into_iter().rev());
2216 return Err(ExpectedError("Array".to_owned(), val.to_string()))
2219 return Err(MissingFieldError("fields".to_owned()))
2225 return Err(ExpectedError("String or Object".to_owned(), json.to_string()))
2228 let idx = match names.iter().position(|n| *n == &name[..]) {
2230 None => return Err(UnknownVariantError(name))
2235 fn read_enum_variant_arg<T, F>(&mut self, _idx: usize, f: F) -> DecodeResult<T> where
2236 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2241 fn read_enum_struct_variant<T, F>(&mut self, names: &[&str], f: F) -> DecodeResult<T> where
2242 F: FnMut(&mut Decoder, usize) -> DecodeResult<T>,
2244 self.read_enum_variant(names, f)
2248 fn read_enum_struct_variant_field<T, F>(&mut self,
2252 -> DecodeResult<T> where
2253 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2255 self.read_enum_variant_arg(idx, f)
2258 fn read_struct<T, F>(&mut self, _name: &str, _len: usize, f: F) -> DecodeResult<T> where
2259 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2261 let value = f(self)?;
2266 fn read_struct_field<T, F>(&mut self,
2270 -> DecodeResult<T> where
2271 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2273 let mut obj = expect!(self.pop(), Object)?;
2275 let value = match obj.remove(&name.to_string()) {
2277 // Add a Null and try to parse it as an Option<_>
2278 // to get None as a default value.
2279 self.stack.push(Json::Null);
2282 Err(_) => return Err(MissingFieldError(name.to_string())),
2286 self.stack.push(json);
2290 self.stack.push(Json::Object(obj));
2294 fn read_tuple<T, F>(&mut self, tuple_len: usize, f: F) -> DecodeResult<T> where
2295 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2297 self.read_seq(move |d, len| {
2298 if len == tuple_len {
2301 Err(ExpectedError(format!("Tuple{}", tuple_len), format!("Tuple{}", len)))
2306 fn read_tuple_arg<T, F>(&mut self, idx: usize, f: F) -> DecodeResult<T> where
2307 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2309 self.read_seq_elt(idx, f)
2312 fn read_tuple_struct<T, F>(&mut self,
2316 -> DecodeResult<T> where
2317 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2319 self.read_tuple(len, f)
2322 fn read_tuple_struct_arg<T, F>(&mut self,
2325 -> DecodeResult<T> where
2326 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2328 self.read_tuple_arg(idx, f)
2331 fn read_option<T, F>(&mut self, mut f: F) -> DecodeResult<T> where
2332 F: FnMut(&mut Decoder, bool) -> DecodeResult<T>,
2335 Json::Null => f(self, false),
2336 value => { self.stack.push(value); f(self, true) }
2340 fn read_seq<T, F>(&mut self, f: F) -> DecodeResult<T> where
2341 F: FnOnce(&mut Decoder, usize) -> DecodeResult<T>,
2343 let array = expect!(self.pop(), Array)?;
2344 let len = array.len();
2345 self.stack.extend(array.into_iter().rev());
2349 fn read_seq_elt<T, F>(&mut self, _idx: usize, f: F) -> DecodeResult<T> where
2350 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2355 fn read_map<T, F>(&mut self, f: F) -> DecodeResult<T> where
2356 F: FnOnce(&mut Decoder, usize) -> DecodeResult<T>,
2358 let obj = expect!(self.pop(), Object)?;
2359 let len = obj.len();
2360 for (key, value) in obj {
2361 self.stack.push(value);
2362 self.stack.push(Json::String(key));
2367 fn read_map_elt_key<T, F>(&mut self, _idx: usize, f: F) -> DecodeResult<T> where
2368 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2373 fn read_map_elt_val<T, F>(&mut self, _idx: usize, f: F) -> DecodeResult<T> where
2374 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2379 fn error(&mut self, err: &str) -> DecoderError {
2380 ApplicationError(err.to_string())
2384 /// A trait for converting values to JSON
2386 /// Converts the value of `self` to an instance of JSON
2387 fn to_json(&self) -> Json;
2390 macro_rules! to_json_impl_i64 {
2392 $(impl ToJson for $t {
2393 fn to_json(&self) -> Json {
2394 Json::I64(*self as i64)
2400 to_json_impl_i64! { isize, i8, i16, i32, i64 }
2402 macro_rules! to_json_impl_u64 {
2404 $(impl ToJson for $t {
2405 fn to_json(&self) -> Json {
2406 Json::U64(*self as u64)
2412 to_json_impl_u64! { usize, u8, u16, u32, u64 }
2414 impl ToJson for Json {
2415 fn to_json(&self) -> Json { self.clone() }
2418 impl ToJson for f32 {
2419 fn to_json(&self) -> Json { (*self as f64).to_json() }
2422 impl ToJson for f64 {
2423 fn to_json(&self) -> Json {
2424 match self.classify() {
2425 Fp::Nan | Fp::Infinite => Json::Null,
2426 _ => Json::F64(*self)
2431 impl ToJson for () {
2432 fn to_json(&self) -> Json { Json::Null }
2435 impl ToJson for bool {
2436 fn to_json(&self) -> Json { Json::Boolean(*self) }
2439 impl ToJson for str {
2440 fn to_json(&self) -> Json { Json::String(self.to_string()) }
2443 impl ToJson for string::String {
2444 fn to_json(&self) -> Json { Json::String((*self).clone()) }
2447 macro_rules! tuple_impl {
2448 // use variables to indicate the arity of the tuple
2449 ($($tyvar:ident),* ) => {
2450 // the trailing commas are for the 1 tuple
2452 $( $tyvar : ToJson ),*
2453 > ToJson for ( $( $tyvar ),* , ) {
2456 #[allow(non_snake_case)]
2457 fn to_json(&self) -> Json {
2459 ($(ref $tyvar),*,) => Json::Array(vec![$($tyvar.to_json()),*])
2468 tuple_impl!{A, B, C}
2469 tuple_impl!{A, B, C, D}
2470 tuple_impl!{A, B, C, D, E}
2471 tuple_impl!{A, B, C, D, E, F}
2472 tuple_impl!{A, B, C, D, E, F, G}
2473 tuple_impl!{A, B, C, D, E, F, G, H}
2474 tuple_impl!{A, B, C, D, E, F, G, H, I}
2475 tuple_impl!{A, B, C, D, E, F, G, H, I, J}
2476 tuple_impl!{A, B, C, D, E, F, G, H, I, J, K}
2477 tuple_impl!{A, B, C, D, E, F, G, H, I, J, K, L}
2479 impl<A: ToJson> ToJson for [A] {
2480 fn to_json(&self) -> Json { Json::Array(self.iter().map(|elt| elt.to_json()).collect()) }
2483 impl<A: ToJson> ToJson for Vec<A> {
2484 fn to_json(&self) -> Json { Json::Array(self.iter().map(|elt| elt.to_json()).collect()) }
2487 impl<A: ToJson> ToJson for BTreeMap<string::String, A> {
2488 fn to_json(&self) -> Json {
2489 let mut d = BTreeMap::new();
2490 for (key, value) in self {
2491 d.insert((*key).clone(), value.to_json());
2497 impl<A: ToJson> ToJson for HashMap<string::String, A> {
2498 fn to_json(&self) -> Json {
2499 let mut d = BTreeMap::new();
2500 for (key, value) in self {
2501 d.insert((*key).clone(), value.to_json());
2507 impl<A:ToJson> ToJson for Option<A> {
2508 fn to_json(&self) -> Json {
2511 Some(ref value) => value.to_json()
2516 struct FormatShim<'a, 'b: 'a> {
2517 inner: &'a mut fmt::Formatter<'b>,
2520 impl<'a, 'b> fmt::Write for FormatShim<'a, 'b> {
2521 fn write_str(&mut self, s: &str) -> fmt::Result {
2522 match self.inner.write_str(s) {
2524 Err(_) => Err(fmt::Error)
2529 impl fmt::Display for Json {
2530 /// Encodes a json value into a string
2531 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
2532 let mut shim = FormatShim { inner: f };
2533 let mut encoder = Encoder::new(&mut shim);
2534 match self.encode(&mut encoder) {
2536 Err(_) => Err(fmt::Error)
2541 impl<'a> fmt::Display for PrettyJson<'a> {
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 = PrettyEncoder::new(&mut shim);
2546 match self.inner.encode(&mut encoder) {
2548 Err(_) => Err(fmt::Error)
2553 impl<'a, T: Encodable> fmt::Display for AsJson<'a, T> {
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 = Encoder::new(&mut shim);
2558 match self.inner.encode(&mut encoder) {
2560 Err(_) => Err(fmt::Error)
2565 impl<'a, T> AsPrettyJson<'a, T> {
2566 /// Set the indentation level for the emitted JSON
2567 pub fn indent(mut self, indent: usize) -> AsPrettyJson<'a, T> {
2568 self.indent = Some(indent);
2573 impl<'a, T: Encodable> fmt::Display for AsPrettyJson<'a, T> {
2574 /// Encodes a json value into a string
2575 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
2576 let mut shim = FormatShim { inner: f };
2577 let mut encoder = PrettyEncoder::new(&mut shim);
2578 if let Some(n) = self.indent {
2579 encoder.set_indent(n);
2581 match self.inner.encode(&mut encoder) {
2583 Err(_) => Err(fmt::Error)
2588 impl FromStr for Json {
2589 type Err = BuilderError;
2590 fn from_str(s: &str) -> Result<Json, BuilderError> {
2598 use self::Animal::*;
2599 use self::test::Bencher;
2600 use {Encodable, Decodable};
2602 use super::ErrorCode::*;
2603 use super::ParserError::*;
2604 use super::DecoderError::*;
2605 use super::JsonEvent::*;
2606 use super::{Json, from_str, DecodeResult, DecoderError, JsonEvent, Parser,
2607 StackElement, Stack, Decoder, Encoder, EncoderError};
2608 use std::{i64, u64, f32, f64};
2609 use std::io::prelude::*;
2610 use std::collections::BTreeMap;
2613 #[derive(RustcDecodable, Eq, PartialEq, Debug)]
2619 fn test_decode_option_none() {
2621 let obj: OptionData = super::decode(s).unwrap();
2622 assert_eq!(obj, OptionData { opt: None });
2626 fn test_decode_option_some() {
2627 let s = "{ \"opt\": 10 }";
2628 let obj: OptionData = super::decode(s).unwrap();
2629 assert_eq!(obj, OptionData { opt: Some(10) });
2633 fn test_decode_option_malformed() {
2634 check_err::<OptionData>("{ \"opt\": [] }",
2635 ExpectedError("Number".to_string(), "[]".to_string()));
2636 check_err::<OptionData>("{ \"opt\": false }",
2637 ExpectedError("Number".to_string(), "false".to_string()));
2640 #[derive(PartialEq, RustcEncodable, RustcDecodable, Debug)]
2643 Frog(string::String, isize)
2646 #[derive(PartialEq, RustcEncodable, RustcDecodable, Debug)]
2650 c: Vec<string::String>,
2653 #[derive(PartialEq, RustcEncodable, RustcDecodable, Debug)]
2658 fn mk_object(items: &[(string::String, Json)]) -> Json {
2659 let mut d = BTreeMap::new();
2663 (ref key, ref value) => { d.insert((*key).clone(), (*value).clone()); },
2671 fn test_from_str_trait() {
2673 assert!(s.parse::<Json>().unwrap() == s.parse().unwrap());
2677 fn test_write_null() {
2678 assert_eq!(Null.to_string(), "null");
2679 assert_eq!(Null.pretty().to_string(), "null");
2683 fn test_write_i64() {
2684 assert_eq!(U64(0).to_string(), "0");
2685 assert_eq!(U64(0).pretty().to_string(), "0");
2687 assert_eq!(U64(1234).to_string(), "1234");
2688 assert_eq!(U64(1234).pretty().to_string(), "1234");
2690 assert_eq!(I64(-5678).to_string(), "-5678");
2691 assert_eq!(I64(-5678).pretty().to_string(), "-5678");
2693 assert_eq!(U64(7650007200025252000).to_string(), "7650007200025252000");
2694 assert_eq!(U64(7650007200025252000).pretty().to_string(), "7650007200025252000");
2698 fn test_write_f64() {
2699 assert_eq!(F64(3.0).to_string(), "3.0");
2700 assert_eq!(F64(3.0).pretty().to_string(), "3.0");
2702 assert_eq!(F64(3.1).to_string(), "3.1");
2703 assert_eq!(F64(3.1).pretty().to_string(), "3.1");
2705 assert_eq!(F64(-1.5).to_string(), "-1.5");
2706 assert_eq!(F64(-1.5).pretty().to_string(), "-1.5");
2708 assert_eq!(F64(0.5).to_string(), "0.5");
2709 assert_eq!(F64(0.5).pretty().to_string(), "0.5");
2711 assert_eq!(F64(f64::NAN).to_string(), "null");
2712 assert_eq!(F64(f64::NAN).pretty().to_string(), "null");
2714 assert_eq!(F64(f64::INFINITY).to_string(), "null");
2715 assert_eq!(F64(f64::INFINITY).pretty().to_string(), "null");
2717 assert_eq!(F64(f64::NEG_INFINITY).to_string(), "null");
2718 assert_eq!(F64(f64::NEG_INFINITY).pretty().to_string(), "null");
2722 fn test_write_str() {
2723 assert_eq!(String("".to_string()).to_string(), "\"\"");
2724 assert_eq!(String("".to_string()).pretty().to_string(), "\"\"");
2726 assert_eq!(String("homura".to_string()).to_string(), "\"homura\"");
2727 assert_eq!(String("madoka".to_string()).pretty().to_string(), "\"madoka\"");
2731 fn test_write_bool() {
2732 assert_eq!(Boolean(true).to_string(), "true");
2733 assert_eq!(Boolean(true).pretty().to_string(), "true");
2735 assert_eq!(Boolean(false).to_string(), "false");
2736 assert_eq!(Boolean(false).pretty().to_string(), "false");
2740 fn test_write_array() {
2741 assert_eq!(Array(vec![]).to_string(), "[]");
2742 assert_eq!(Array(vec![]).pretty().to_string(), "[]");
2744 assert_eq!(Array(vec![Boolean(true)]).to_string(), "[true]");
2746 Array(vec![Boolean(true)]).pretty().to_string(),
2753 let long_test_array = Array(vec![
2756 Array(vec![String("foo\nbar".to_string()), F64(3.5)])]);
2758 assert_eq!(long_test_array.to_string(),
2759 "[false,null,[\"foo\\nbar\",3.5]]");
2761 long_test_array.pretty().to_string(),
2775 fn test_write_object() {
2776 assert_eq!(mk_object(&[]).to_string(), "{}");
2777 assert_eq!(mk_object(&[]).pretty().to_string(), "{}");
2781 ("a".to_string(), Boolean(true))
2786 mk_object(&[("a".to_string(), Boolean(true))]).pretty().to_string(),
2793 let complex_obj = mk_object(&[
2794 ("b".to_string(), Array(vec![
2795 mk_object(&[("c".to_string(), String("\x0c\r".to_string()))]),
2796 mk_object(&[("d".to_string(), String("".to_string()))])
2801 complex_obj.to_string(),
2804 {\"c\":\"\\f\\r\"},\
2810 complex_obj.pretty().to_string(),
2815 \"c\": \"\\f\\r\"\n \
2824 let a = mk_object(&[
2825 ("a".to_string(), Boolean(true)),
2826 ("b".to_string(), Array(vec![
2827 mk_object(&[("c".to_string(), String("\x0c\r".to_string()))]),
2828 mk_object(&[("d".to_string(), String("".to_string()))])
2832 // We can't compare the strings directly because the object fields be
2833 // printed in a different order.
2834 assert_eq!(a.clone(), a.to_string().parse().unwrap());
2835 assert_eq!(a.clone(), a.pretty().to_string().parse().unwrap());
2839 fn test_write_enum() {
2842 super::as_json(&animal).to_string(),
2846 super::as_pretty_json(&animal).to_string(),
2850 let animal = Frog("Henry".to_string(), 349);
2852 super::as_json(&animal).to_string(),
2853 "{\"variant\":\"Frog\",\"fields\":[\"Henry\",349]}"
2856 super::as_pretty_json(&animal).to_string(),
2858 \"variant\": \"Frog\",\n \
2867 macro_rules! check_encoder_for_simple {
2868 ($value:expr, $expected:expr) => ({
2869 let s = super::as_json(&$value).to_string();
2870 assert_eq!(s, $expected);
2872 let s = super::as_pretty_json(&$value).to_string();
2873 assert_eq!(s, $expected);
2878 fn test_write_some() {
2879 check_encoder_for_simple!(Some("jodhpurs".to_string()), "\"jodhpurs\"");
2883 fn test_write_none() {
2884 check_encoder_for_simple!(None::<string::String>, "null");
2888 fn test_write_char() {
2889 check_encoder_for_simple!('a', "\"a\"");
2890 check_encoder_for_simple!('\t', "\"\\t\"");
2891 check_encoder_for_simple!('\u{0000}', "\"\\u0000\"");
2892 check_encoder_for_simple!('\u{001b}', "\"\\u001b\"");
2893 check_encoder_for_simple!('\u{007f}', "\"\\u007f\"");
2894 check_encoder_for_simple!('\u{00a0}', "\"\u{00a0}\"");
2895 check_encoder_for_simple!('\u{abcd}', "\"\u{abcd}\"");
2896 check_encoder_for_simple!('\u{10ffff}', "\"\u{10ffff}\"");
2900 fn test_trailing_characters() {
2901 assert_eq!(from_str("nulla"), Err(SyntaxError(TrailingCharacters, 1, 5)));
2902 assert_eq!(from_str("truea"), Err(SyntaxError(TrailingCharacters, 1, 5)));
2903 assert_eq!(from_str("falsea"), Err(SyntaxError(TrailingCharacters, 1, 6)));
2904 assert_eq!(from_str("1a"), Err(SyntaxError(TrailingCharacters, 1, 2)));
2905 assert_eq!(from_str("[]a"), Err(SyntaxError(TrailingCharacters, 1, 3)));
2906 assert_eq!(from_str("{}a"), Err(SyntaxError(TrailingCharacters, 1, 3)));
2910 fn test_read_identifiers() {
2911 assert_eq!(from_str("n"), Err(SyntaxError(InvalidSyntax, 1, 2)));
2912 assert_eq!(from_str("nul"), Err(SyntaxError(InvalidSyntax, 1, 4)));
2913 assert_eq!(from_str("t"), Err(SyntaxError(InvalidSyntax, 1, 2)));
2914 assert_eq!(from_str("truz"), Err(SyntaxError(InvalidSyntax, 1, 4)));
2915 assert_eq!(from_str("f"), Err(SyntaxError(InvalidSyntax, 1, 2)));
2916 assert_eq!(from_str("faz"), Err(SyntaxError(InvalidSyntax, 1, 3)));
2918 assert_eq!(from_str("null"), Ok(Null));
2919 assert_eq!(from_str("true"), Ok(Boolean(true)));
2920 assert_eq!(from_str("false"), Ok(Boolean(false)));
2921 assert_eq!(from_str(" null "), Ok(Null));
2922 assert_eq!(from_str(" true "), Ok(Boolean(true)));
2923 assert_eq!(from_str(" false "), Ok(Boolean(false)));
2927 fn test_decode_identifiers() {
2928 let v: () = super::decode("null").unwrap();
2931 let v: bool = super::decode("true").unwrap();
2932 assert_eq!(v, true);
2934 let v: bool = super::decode("false").unwrap();
2935 assert_eq!(v, false);
2939 fn test_read_number() {
2940 assert_eq!(from_str("+"), Err(SyntaxError(InvalidSyntax, 1, 1)));
2941 assert_eq!(from_str("."), Err(SyntaxError(InvalidSyntax, 1, 1)));
2942 assert_eq!(from_str("NaN"), Err(SyntaxError(InvalidSyntax, 1, 1)));
2943 assert_eq!(from_str("-"), Err(SyntaxError(InvalidNumber, 1, 2)));
2944 assert_eq!(from_str("00"), Err(SyntaxError(InvalidNumber, 1, 2)));
2945 assert_eq!(from_str("1."), Err(SyntaxError(InvalidNumber, 1, 3)));
2946 assert_eq!(from_str("1e"), Err(SyntaxError(InvalidNumber, 1, 3)));
2947 assert_eq!(from_str("1e+"), Err(SyntaxError(InvalidNumber, 1, 4)));
2949 assert_eq!(from_str("18446744073709551616"), Err(SyntaxError(InvalidNumber, 1, 20)));
2950 assert_eq!(from_str("-9223372036854775809"), Err(SyntaxError(InvalidNumber, 1, 21)));
2952 assert_eq!(from_str("3"), Ok(U64(3)));
2953 assert_eq!(from_str("3.1"), Ok(F64(3.1)));
2954 assert_eq!(from_str("-1.2"), Ok(F64(-1.2)));
2955 assert_eq!(from_str("0.4"), Ok(F64(0.4)));
2956 assert_eq!(from_str("0.4e5"), Ok(F64(0.4e5)));
2957 assert_eq!(from_str("0.4e+15"), Ok(F64(0.4e15)));
2958 assert_eq!(from_str("0.4e-01"), Ok(F64(0.4e-01)));
2959 assert_eq!(from_str(" 3 "), Ok(U64(3)));
2961 assert_eq!(from_str("-9223372036854775808"), Ok(I64(i64::MIN)));
2962 assert_eq!(from_str("9223372036854775807"), Ok(U64(i64::MAX as u64)));
2963 assert_eq!(from_str("18446744073709551615"), Ok(U64(u64::MAX)));
2967 fn test_decode_numbers() {
2968 let v: f64 = super::decode("3").unwrap();
2971 let v: f64 = super::decode("3.1").unwrap();
2974 let v: f64 = super::decode("-1.2").unwrap();
2975 assert_eq!(v, -1.2);
2977 let v: f64 = super::decode("0.4").unwrap();
2980 let v: f64 = super::decode("0.4e5").unwrap();
2981 assert_eq!(v, 0.4e5);
2983 let v: f64 = super::decode("0.4e15").unwrap();
2984 assert_eq!(v, 0.4e15);
2986 let v: f64 = super::decode("0.4e-01").unwrap();
2987 assert_eq!(v, 0.4e-01);
2989 let v: u64 = super::decode("0").unwrap();
2992 let v: u64 = super::decode("18446744073709551615").unwrap();
2993 assert_eq!(v, u64::MAX);
2995 let v: i64 = super::decode("-9223372036854775808").unwrap();
2996 assert_eq!(v, i64::MIN);
2998 let v: i64 = super::decode("9223372036854775807").unwrap();
2999 assert_eq!(v, i64::MAX);
3001 let res: DecodeResult<i64> = super::decode("765.25");
3002 assert_eq!(res, Err(ExpectedError("Integer".to_string(),
3003 "765.25".to_string())));
3007 fn test_read_str() {
3008 assert_eq!(from_str("\""), Err(SyntaxError(EOFWhileParsingString, 1, 2)));
3009 assert_eq!(from_str("\"lol"), Err(SyntaxError(EOFWhileParsingString, 1, 5)));
3011 assert_eq!(from_str("\"\""), Ok(String("".to_string())));
3012 assert_eq!(from_str("\"foo\""), Ok(String("foo".to_string())));
3013 assert_eq!(from_str("\"\\\"\""), Ok(String("\"".to_string())));
3014 assert_eq!(from_str("\"\\b\""), Ok(String("\x08".to_string())));
3015 assert_eq!(from_str("\"\\n\""), Ok(String("\n".to_string())));
3016 assert_eq!(from_str("\"\\r\""), Ok(String("\r".to_string())));
3017 assert_eq!(from_str("\"\\t\""), Ok(String("\t".to_string())));
3018 assert_eq!(from_str(" \"foo\" "), Ok(String("foo".to_string())));
3019 assert_eq!(from_str("\"\\u12ab\""), Ok(String("\u{12ab}".to_string())));
3020 assert_eq!(from_str("\"\\uAB12\""), Ok(String("\u{AB12}".to_string())));
3024 fn test_decode_str() {
3025 let s = [("\"\"", ""),
3028 ("\"\\b\"", "\x08"),
3032 ("\"\\u12ab\"", "\u{12ab}"),
3033 ("\"\\uAB12\"", "\u{AB12}")];
3036 let v: string::String = super::decode(i).unwrap();
3042 fn test_read_array() {
3043 assert_eq!(from_str("["), Err(SyntaxError(EOFWhileParsingValue, 1, 2)));
3044 assert_eq!(from_str("[1"), Err(SyntaxError(EOFWhileParsingArray, 1, 3)));
3045 assert_eq!(from_str("[1,"), Err(SyntaxError(EOFWhileParsingValue, 1, 4)));
3046 assert_eq!(from_str("[1,]"), Err(SyntaxError(InvalidSyntax, 1, 4)));
3047 assert_eq!(from_str("[6 7]"), Err(SyntaxError(InvalidSyntax, 1, 4)));
3049 assert_eq!(from_str("[]"), Ok(Array(vec![])));
3050 assert_eq!(from_str("[ ]"), Ok(Array(vec![])));
3051 assert_eq!(from_str("[true]"), Ok(Array(vec![Boolean(true)])));
3052 assert_eq!(from_str("[ false ]"), Ok(Array(vec![Boolean(false)])));
3053 assert_eq!(from_str("[null]"), Ok(Array(vec![Null])));
3054 assert_eq!(from_str("[3, 1]"),
3055 Ok(Array(vec![U64(3), U64(1)])));
3056 assert_eq!(from_str("\n[3, 2]\n"),
3057 Ok(Array(vec![U64(3), U64(2)])));
3058 assert_eq!(from_str("[2, [4, 1]]"),
3059 Ok(Array(vec![U64(2), Array(vec![U64(4), U64(1)])])));
3063 fn test_decode_array() {
3064 let v: Vec<()> = super::decode("[]").unwrap();
3067 let v: Vec<()> = super::decode("[null]").unwrap();
3068 assert_eq!(v, [()]);
3070 let v: Vec<bool> = super::decode("[true]").unwrap();
3071 assert_eq!(v, [true]);
3073 let v: Vec<isize> = super::decode("[3, 1]").unwrap();
3074 assert_eq!(v, [3, 1]);
3076 let v: Vec<Vec<usize>> = super::decode("[[3], [1, 2]]").unwrap();
3077 assert_eq!(v, [vec![3], vec![1, 2]]);
3081 fn test_decode_tuple() {
3082 let t: (usize, usize, usize) = super::decode("[1, 2, 3]").unwrap();
3083 assert_eq!(t, (1, 2, 3));
3085 let t: (usize, string::String) = super::decode("[1, \"two\"]").unwrap();
3086 assert_eq!(t, (1, "two".to_string()));
3090 fn test_decode_tuple_malformed_types() {
3091 assert!(super::decode::<(usize, string::String)>("[1, 2]").is_err());
3095 fn test_decode_tuple_malformed_length() {
3096 assert!(super::decode::<(usize, usize)>("[1, 2, 3]").is_err());
3100 fn test_read_object() {
3101 assert_eq!(from_str("{"), Err(SyntaxError(EOFWhileParsingObject, 1, 2)));
3102 assert_eq!(from_str("{ "), Err(SyntaxError(EOFWhileParsingObject, 1, 3)));
3103 assert_eq!(from_str("{1"), Err(SyntaxError(KeyMustBeAString, 1, 2)));
3104 assert_eq!(from_str("{ \"a\""), Err(SyntaxError(EOFWhileParsingObject, 1, 6)));
3105 assert_eq!(from_str("{\"a\""), Err(SyntaxError(EOFWhileParsingObject, 1, 5)));
3106 assert_eq!(from_str("{\"a\" "), Err(SyntaxError(EOFWhileParsingObject, 1, 6)));
3108 assert_eq!(from_str("{\"a\" 1"), Err(SyntaxError(ExpectedColon, 1, 6)));
3109 assert_eq!(from_str("{\"a\":"), Err(SyntaxError(EOFWhileParsingValue, 1, 6)));
3110 assert_eq!(from_str("{\"a\":1"), Err(SyntaxError(EOFWhileParsingObject, 1, 7)));
3111 assert_eq!(from_str("{\"a\":1 1"), Err(SyntaxError(InvalidSyntax, 1, 8)));
3112 assert_eq!(from_str("{\"a\":1,"), Err(SyntaxError(EOFWhileParsingObject, 1, 8)));
3114 assert_eq!(from_str("{}").unwrap(), mk_object(&[]));
3115 assert_eq!(from_str("{\"a\": 3}").unwrap(),
3116 mk_object(&[("a".to_string(), U64(3))]));
3118 assert_eq!(from_str(
3119 "{ \"a\": null, \"b\" : true }").unwrap(),
3121 ("a".to_string(), Null),
3122 ("b".to_string(), Boolean(true))]));
3123 assert_eq!(from_str("\n{ \"a\": null, \"b\" : true }\n").unwrap(),
3125 ("a".to_string(), Null),
3126 ("b".to_string(), Boolean(true))]));
3127 assert_eq!(from_str(
3128 "{\"a\" : 1.0 ,\"b\": [ true ]}").unwrap(),
3130 ("a".to_string(), F64(1.0)),
3131 ("b".to_string(), Array(vec![Boolean(true)]))
3133 assert_eq!(from_str(
3139 { \"c\": {\"d\": null} } \
3143 ("a".to_string(), F64(1.0)),
3144 ("b".to_string(), Array(vec![
3146 String("foo\nbar".to_string()),
3148 ("c".to_string(), mk_object(&[("d".to_string(), Null)]))
3155 fn test_decode_struct() {
3158 { \"a\": null, \"b\": 2, \"c\": [\"abc\", \"xyz\"] }
3162 let v: Outer = super::decode(s).unwrap();
3167 Inner { a: (), b: 2, c: vec!["abc".to_string(), "xyz".to_string()] }
3173 #[derive(RustcDecodable)]
3174 struct FloatStruct {
3179 fn test_decode_struct_with_nan() {
3180 let s = "{\"f\":null,\"a\":[null,123]}";
3181 let obj: FloatStruct = super::decode(s).unwrap();
3182 assert!(obj.f.is_nan());
3183 assert!(obj.a[0].is_nan());
3184 assert_eq!(obj.a[1], 123f64);
3188 fn test_decode_option() {
3189 let value: Option<string::String> = super::decode("null").unwrap();
3190 assert_eq!(value, None);
3192 let value: Option<string::String> = super::decode("\"jodhpurs\"").unwrap();
3193 assert_eq!(value, Some("jodhpurs".to_string()));
3197 fn test_decode_enum() {
3198 let value: Animal = super::decode("\"Dog\"").unwrap();
3199 assert_eq!(value, Dog);
3201 let s = "{\"variant\":\"Frog\",\"fields\":[\"Henry\",349]}";
3202 let value: Animal = super::decode(s).unwrap();
3203 assert_eq!(value, Frog("Henry".to_string(), 349));
3207 fn test_decode_map() {
3208 let s = "{\"a\": \"Dog\", \"b\": {\"variant\":\"Frog\",\
3209 \"fields\":[\"Henry\", 349]}}";
3210 let mut map: BTreeMap<string::String, Animal> = super::decode(s).unwrap();
3212 assert_eq!(map.remove(&"a".to_string()), Some(Dog));
3213 assert_eq!(map.remove(&"b".to_string()), Some(Frog("Henry".to_string(), 349)));
3217 fn test_multiline_errors() {
3218 assert_eq!(from_str("{\n \"foo\":\n \"bar\""),
3219 Err(SyntaxError(EOFWhileParsingObject, 3, 8)));
3222 #[derive(RustcDecodable)]
3224 struct DecodeStruct {
3228 w: Vec<DecodeStruct>
3230 #[derive(RustcDecodable)]
3235 fn check_err<T: Decodable>(to_parse: &'static str, expected: DecoderError) {
3236 let res: DecodeResult<T> = match from_str(to_parse) {
3237 Err(e) => Err(ParseError(e)),
3238 Ok(json) => Decodable::decode(&mut Decoder::new(json))
3241 Ok(_) => panic!("`{:?}` parsed & decoded ok, expecting error `{:?}`",
3242 to_parse, expected),
3243 Err(ParseError(e)) => panic!("`{:?}` is not valid json: {:?}",
3246 assert_eq!(e, expected);
3251 fn test_decode_errors_struct() {
3252 check_err::<DecodeStruct>("[]", ExpectedError("Object".to_string(), "[]".to_string()));
3253 check_err::<DecodeStruct>("{\"x\": true, \"y\": true, \"z\": \"\", \"w\": []}",
3254 ExpectedError("Number".to_string(), "true".to_string()));
3255 check_err::<DecodeStruct>("{\"x\": 1, \"y\": [], \"z\": \"\", \"w\": []}",
3256 ExpectedError("Boolean".to_string(), "[]".to_string()));
3257 check_err::<DecodeStruct>("{\"x\": 1, \"y\": true, \"z\": {}, \"w\": []}",
3258 ExpectedError("String".to_string(), "{}".to_string()));
3259 check_err::<DecodeStruct>("{\"x\": 1, \"y\": true, \"z\": \"\", \"w\": null}",
3260 ExpectedError("Array".to_string(), "null".to_string()));
3261 check_err::<DecodeStruct>("{\"x\": 1, \"y\": true, \"z\": \"\"}",
3262 MissingFieldError("w".to_string()));
3265 fn test_decode_errors_enum() {
3266 check_err::<DecodeEnum>("{}",
3267 MissingFieldError("variant".to_string()));
3268 check_err::<DecodeEnum>("{\"variant\": 1}",
3269 ExpectedError("String".to_string(), "1".to_string()));
3270 check_err::<DecodeEnum>("{\"variant\": \"A\"}",
3271 MissingFieldError("fields".to_string()));
3272 check_err::<DecodeEnum>("{\"variant\": \"A\", \"fields\": null}",
3273 ExpectedError("Array".to_string(), "null".to_string()));
3274 check_err::<DecodeEnum>("{\"variant\": \"C\", \"fields\": []}",
3275 UnknownVariantError("C".to_string()));
3280 let json_value = from_str("{\"dog\" : \"cat\"}").unwrap();
3281 let found_str = json_value.find("dog");
3282 assert!(found_str.unwrap().as_string().unwrap() == "cat");
3286 fn test_find_path(){
3287 let json_value = from_str("{\"dog\":{\"cat\": {\"mouse\" : \"cheese\"}}}").unwrap();
3288 let found_str = json_value.find_path(&["dog", "cat", "mouse"]);
3289 assert!(found_str.unwrap().as_string().unwrap() == "cheese");
3294 let json_value = from_str("{\"dog\":{\"cat\": {\"mouse\" : \"cheese\"}}}").unwrap();
3295 let found_str = json_value.search("mouse").and_then(|j| j.as_string());
3296 assert!(found_str.unwrap() == "cheese");
3301 let json_value = from_str("{\"animals\":[\"dog\",\"cat\",\"mouse\"]}").unwrap();
3302 let ref array = json_value["animals"];
3303 assert_eq!(array[0].as_string().unwrap(), "dog");
3304 assert_eq!(array[1].as_string().unwrap(), "cat");
3305 assert_eq!(array[2].as_string().unwrap(), "mouse");
3309 fn test_is_object(){
3310 let json_value = from_str("{}").unwrap();
3311 assert!(json_value.is_object());
3315 fn test_as_object(){
3316 let json_value = from_str("{}").unwrap();
3317 let json_object = json_value.as_object();
3318 assert!(json_object.is_some());
3323 let json_value = from_str("[1, 2, 3]").unwrap();
3324 assert!(json_value.is_array());
3329 let json_value = from_str("[1, 2, 3]").unwrap();
3330 let json_array = json_value.as_array();
3331 let expected_length = 3;
3332 assert!(json_array.is_some() && json_array.unwrap().len() == expected_length);
3336 fn test_is_string(){
3337 let json_value = from_str("\"dog\"").unwrap();
3338 assert!(json_value.is_string());
3342 fn test_as_string(){
3343 let json_value = from_str("\"dog\"").unwrap();
3344 let json_str = json_value.as_string();
3345 let expected_str = "dog";
3346 assert_eq!(json_str, Some(expected_str));
3350 fn test_is_number(){
3351 let json_value = from_str("12").unwrap();
3352 assert!(json_value.is_number());
3357 let json_value = from_str("-12").unwrap();
3358 assert!(json_value.is_i64());
3360 let json_value = from_str("12").unwrap();
3361 assert!(!json_value.is_i64());
3363 let json_value = from_str("12.0").unwrap();
3364 assert!(!json_value.is_i64());
3369 let json_value = from_str("12").unwrap();
3370 assert!(json_value.is_u64());
3372 let json_value = from_str("-12").unwrap();
3373 assert!(!json_value.is_u64());
3375 let json_value = from_str("12.0").unwrap();
3376 assert!(!json_value.is_u64());
3381 let json_value = from_str("12").unwrap();
3382 assert!(!json_value.is_f64());
3384 let json_value = from_str("-12").unwrap();
3385 assert!(!json_value.is_f64());
3387 let json_value = from_str("12.0").unwrap();
3388 assert!(json_value.is_f64());
3390 let json_value = from_str("-12.0").unwrap();
3391 assert!(json_value.is_f64());
3396 let json_value = from_str("-12").unwrap();
3397 let json_num = json_value.as_i64();
3398 assert_eq!(json_num, Some(-12));
3403 let json_value = from_str("12").unwrap();
3404 let json_num = json_value.as_u64();
3405 assert_eq!(json_num, Some(12));
3410 let json_value = from_str("12.0").unwrap();
3411 let json_num = json_value.as_f64();
3412 assert_eq!(json_num, Some(12f64));
3416 fn test_is_boolean(){
3417 let json_value = from_str("false").unwrap();
3418 assert!(json_value.is_boolean());
3422 fn test_as_boolean(){
3423 let json_value = from_str("false").unwrap();
3424 let json_bool = json_value.as_boolean();
3425 let expected_bool = false;
3426 assert!(json_bool.is_some() && json_bool.unwrap() == expected_bool);
3431 let json_value = from_str("null").unwrap();
3432 assert!(json_value.is_null());
3437 let json_value = from_str("null").unwrap();
3438 let json_null = json_value.as_null();
3439 let expected_null = ();
3440 assert!(json_null.is_some() && json_null.unwrap() == expected_null);
3444 fn test_encode_hashmap_with_numeric_key() {
3445 use std::str::from_utf8;
3446 use std::collections::HashMap;
3447 let mut hm: HashMap<usize, bool> = HashMap::new();
3449 let mut mem_buf = Vec::new();
3450 write!(&mut mem_buf, "{}", super::as_pretty_json(&hm)).unwrap();
3451 let json_str = from_utf8(&mem_buf[..]).unwrap();
3452 match from_str(json_str) {
3453 Err(_) => panic!("Unable to parse json_str: {:?}", json_str),
3454 _ => {} // it parsed and we are good to go
3459 fn test_prettyencode_hashmap_with_numeric_key() {
3460 use std::str::from_utf8;
3461 use std::collections::HashMap;
3462 let mut hm: HashMap<usize, bool> = HashMap::new();
3464 let mut mem_buf = Vec::new();
3465 write!(&mut mem_buf, "{}", super::as_pretty_json(&hm)).unwrap();
3466 let json_str = from_utf8(&mem_buf[..]).unwrap();
3467 match from_str(json_str) {
3468 Err(_) => panic!("Unable to parse json_str: {:?}", json_str),
3469 _ => {} // it parsed and we are good to go
3474 fn test_prettyencoder_indent_level_param() {
3475 use std::str::from_utf8;
3476 use std::collections::BTreeMap;
3478 let mut tree = BTreeMap::new();
3480 tree.insert("hello".to_string(), String("guten tag".to_string()));
3481 tree.insert("goodbye".to_string(), String("sayonara".to_string()));
3484 // The following layout below should look a lot like
3485 // the pretty-printed JSON (indent * x)
3488 String("greetings".to_string()), // 1x
3489 Object(tree), // 1x + 2x + 2x + 1x
3491 // End JSON array (7 lines)
3494 // Helper function for counting indents
3495 fn indents(source: &str) -> usize {
3496 let trimmed = source.trim_left_matches(' ');
3497 source.len() - trimmed.len()
3500 // Test up to 4 spaces of indents (more?)
3502 let mut writer = Vec::new();
3503 write!(&mut writer, "{}",
3504 super::as_pretty_json(&json).indent(i)).unwrap();
3506 let printed = from_utf8(&writer[..]).unwrap();
3508 // Check for indents at each line
3509 let lines: Vec<&str> = printed.lines().collect();
3510 assert_eq!(lines.len(), 7); // JSON should be 7 lines
3512 assert_eq!(indents(lines[0]), 0 * i); // [
3513 assert_eq!(indents(lines[1]), 1 * i); // "greetings",
3514 assert_eq!(indents(lines[2]), 1 * i); // {
3515 assert_eq!(indents(lines[3]), 2 * i); // "hello": "guten tag",
3516 assert_eq!(indents(lines[4]), 2 * i); // "goodbye": "sayonara"
3517 assert_eq!(indents(lines[5]), 1 * i); // },
3518 assert_eq!(indents(lines[6]), 0 * i); // ]
3520 // Finally, test that the pretty-printed JSON is valid
3521 from_str(printed).ok().expect("Pretty-printed JSON is invalid!");
3526 fn test_hashmap_with_enum_key() {
3527 use std::collections::HashMap;
3529 #[derive(RustcEncodable, Eq, Hash, PartialEq, RustcDecodable, Debug)]
3535 let mut map = HashMap::new();
3536 map.insert(Enum::Foo, 0);
3537 let result = json::encode(&map).unwrap();
3538 assert_eq!(&result[..], r#"{"Foo":0}"#);
3539 let decoded: HashMap<Enum, _> = json::decode(&result).unwrap();
3540 assert_eq!(map, decoded);
3544 fn test_hashmap_with_numeric_key_can_handle_double_quote_delimited_key() {
3545 use std::collections::HashMap;
3547 let json_str = "{\"1\":true}";
3548 let json_obj = match from_str(json_str) {
3549 Err(_) => panic!("Unable to parse json_str: {:?}", json_str),
3552 let mut decoder = Decoder::new(json_obj);
3553 let _hm: HashMap<usize, bool> = Decodable::decode(&mut decoder).unwrap();
3557 fn test_hashmap_with_numeric_key_will_error_with_string_keys() {
3558 use std::collections::HashMap;
3560 let json_str = "{\"a\":true}";
3561 let json_obj = match from_str(json_str) {
3562 Err(_) => panic!("Unable to parse json_str: {:?}", json_str),
3565 let mut decoder = Decoder::new(json_obj);
3566 let result: Result<HashMap<usize, bool>, DecoderError> = Decodable::decode(&mut decoder);
3567 assert_eq!(result, Err(ExpectedError("Number".to_string(), "a".to_string())));
3570 fn assert_stream_equal(src: &str,
3571 expected: Vec<(JsonEvent, Vec<StackElement>)>) {
3572 let mut parser = Parser::new(src.chars());
3575 let evt = match parser.next() {
3579 let (ref expected_evt, ref expected_stack) = expected[i];
3580 if !parser.stack().is_equal_to(expected_stack) {
3581 panic!("Parser stack is not equal to {:?}", expected_stack);
3583 assert_eq!(&evt, expected_evt);
3588 fn test_streaming_parser() {
3589 assert_stream_equal(
3590 r#"{ "foo":"bar", "array" : [0, 1, 2, 3, 4, 5], "idents":[null,true,false]}"#,
3592 (ObjectStart, vec![]),
3593 (StringValue("bar".to_string()), vec![StackElement::Key("foo")]),
3594 (ArrayStart, vec![StackElement::Key("array")]),
3595 (U64Value(0), vec![StackElement::Key("array"), StackElement::Index(0)]),
3596 (U64Value(1), vec![StackElement::Key("array"), StackElement::Index(1)]),
3597 (U64Value(2), vec![StackElement::Key("array"), StackElement::Index(2)]),
3598 (U64Value(3), vec![StackElement::Key("array"), StackElement::Index(3)]),
3599 (U64Value(4), vec![StackElement::Key("array"), StackElement::Index(4)]),
3600 (U64Value(5), vec![StackElement::Key("array"), StackElement::Index(5)]),
3601 (ArrayEnd, vec![StackElement::Key("array")]),
3602 (ArrayStart, vec![StackElement::Key("idents")]),
3603 (NullValue, vec![StackElement::Key("idents"),
3604 StackElement::Index(0)]),
3605 (BooleanValue(true), vec![StackElement::Key("idents"),
3606 StackElement::Index(1)]),
3607 (BooleanValue(false), vec![StackElement::Key("idents"),
3608 StackElement::Index(2)]),
3609 (ArrayEnd, vec![StackElement::Key("idents")]),
3610 (ObjectEnd, vec![]),
3614 fn last_event(src: &str) -> JsonEvent {
3615 let mut parser = Parser::new(src.chars());
3616 let mut evt = NullValue;
3618 evt = match parser.next() {
3626 fn test_read_object_streaming() {
3627 assert_eq!(last_event("{ "), Error(SyntaxError(EOFWhileParsingObject, 1, 3)));
3628 assert_eq!(last_event("{1"), Error(SyntaxError(KeyMustBeAString, 1, 2)));
3629 assert_eq!(last_event("{ \"a\""), Error(SyntaxError(EOFWhileParsingObject, 1, 6)));
3630 assert_eq!(last_event("{\"a\""), Error(SyntaxError(EOFWhileParsingObject, 1, 5)));
3631 assert_eq!(last_event("{\"a\" "), Error(SyntaxError(EOFWhileParsingObject, 1, 6)));
3633 assert_eq!(last_event("{\"a\" 1"), Error(SyntaxError(ExpectedColon, 1, 6)));
3634 assert_eq!(last_event("{\"a\":"), Error(SyntaxError(EOFWhileParsingValue, 1, 6)));
3635 assert_eq!(last_event("{\"a\":1"), Error(SyntaxError(EOFWhileParsingObject, 1, 7)));
3636 assert_eq!(last_event("{\"a\":1 1"), Error(SyntaxError(InvalidSyntax, 1, 8)));
3637 assert_eq!(last_event("{\"a\":1,"), Error(SyntaxError(EOFWhileParsingObject, 1, 8)));
3638 assert_eq!(last_event("{\"a\":1,}"), Error(SyntaxError(TrailingComma, 1, 8)));
3640 assert_stream_equal(
3642 vec![(ObjectStart, vec![]), (ObjectEnd, vec![])]
3644 assert_stream_equal(
3647 (ObjectStart, vec![]),
3648 (U64Value(3), vec![StackElement::Key("a")]),
3649 (ObjectEnd, vec![]),
3652 assert_stream_equal(
3653 "{ \"a\": null, \"b\" : true }",
3655 (ObjectStart, vec![]),
3656 (NullValue, vec![StackElement::Key("a")]),
3657 (BooleanValue(true), vec![StackElement::Key("b")]),
3658 (ObjectEnd, vec![]),
3661 assert_stream_equal(
3662 "{\"a\" : 1.0 ,\"b\": [ true ]}",
3664 (ObjectStart, vec![]),
3665 (F64Value(1.0), vec![StackElement::Key("a")]),
3666 (ArrayStart, vec![StackElement::Key("b")]),
3667 (BooleanValue(true),vec![StackElement::Key("b"), StackElement::Index(0)]),
3668 (ArrayEnd, vec![StackElement::Key("b")]),
3669 (ObjectEnd, vec![]),
3672 assert_stream_equal(
3678 { "c": {"d": null} }
3682 (ObjectStart, vec![]),
3683 (F64Value(1.0), vec![StackElement::Key("a")]),
3684 (ArrayStart, vec![StackElement::Key("b")]),
3685 (BooleanValue(true), vec![StackElement::Key("b"),
3686 StackElement::Index(0)]),
3687 (StringValue("foo\nbar".to_string()), vec![StackElement::Key("b"),
3688 StackElement::Index(1)]),
3689 (ObjectStart, vec![StackElement::Key("b"),
3690 StackElement::Index(2)]),
3691 (ObjectStart, vec![StackElement::Key("b"),
3692 StackElement::Index(2),
3693 StackElement::Key("c")]),
3694 (NullValue, vec![StackElement::Key("b"),
3695 StackElement::Index(2),
3696 StackElement::Key("c"),
3697 StackElement::Key("d")]),
3698 (ObjectEnd, vec![StackElement::Key("b"),
3699 StackElement::Index(2),
3700 StackElement::Key("c")]),
3701 (ObjectEnd, vec![StackElement::Key("b"),
3702 StackElement::Index(2)]),
3703 (ArrayEnd, vec![StackElement::Key("b")]),
3704 (ObjectEnd, vec![]),
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.is_empty());
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_isize.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_usize.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!((1_usize, 2_usize).to_json(), array2);
3911 assert_eq!((1_usize, 2_usize, 3_usize).to_json(), array3);
3912 assert_eq!([1_usize, 2_usize].to_json(), array2);
3913 assert_eq!((&[1_usize, 2_usize, 3_usize]).to_json(), array3);
3914 assert_eq!((vec![1_usize, 2_usize]).to_json(), array2);
3915 assert_eq!(vec![1_usize, 2_usize, 3_usize].to_json(), array3);
3916 let mut tree_map = BTreeMap::new();
3917 tree_map.insert("a".to_string(), 1 as usize);
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(), 1 as usize);
3922 hash_map.insert("b".to_string(), 2);
3923 assert_eq!(hash_map.to_json(), object);
3924 assert_eq!(Some(15).to_json(), I64(15));
3925 assert_eq!(Some(15 as usize).to_json(), U64(15));
3926 assert_eq!(None::<isize>.to_json(), Null);
3930 fn test_encode_hashmap_with_arbitrary_key() {
3931 use std::collections::HashMap;
3932 #[derive(PartialEq, Eq, Hash, RustcEncodable)]
3933 struct ArbitraryType(usize);
3934 let mut hm: HashMap<ArbitraryType, bool> = HashMap::new();
3935 hm.insert(ArbitraryType(1), true);
3936 let mut mem_buf = string::String::new();
3937 let mut encoder = Encoder::new(&mut mem_buf);
3938 let result = hm.encode(&mut encoder);
3939 match result.unwrap_err() {
3940 EncoderError::BadHashmapKey => (),
3941 _ => panic!("expected bad hash map key")
3946 fn bench_streaming_small(b: &mut Bencher) {
3948 let mut parser = Parser::new(
3954 { "c": {"d": null} }
3959 match parser.next() {
3967 fn bench_small(b: &mut Bencher) {
3969 let _ = from_str(r#"{
3974 { "c": {"d": null} }
3980 fn big_json() -> string::String {
3981 let mut src = "[\n".to_string();
3983 src.push_str(r#"{ "a": true, "b": null, "c":3.1415, "d": "Hello world", "e": \
3986 src.push_str("{}]");
3991 fn bench_streaming_large(b: &mut Bencher) {
3992 let src = big_json();
3994 let mut parser = Parser::new(src.chars());
3996 match parser.next() {
4004 fn bench_large(b: &mut Bencher) {
4005 let src = big_json();
4006 b.iter( || { let _ = from_str(&src); });