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 fn from(err: fmt::Error) -> EncoderError { EncoderError::FmtError(err) }
371 pub type EncodeResult = Result<(), EncoderError>;
372 pub type DecodeResult<T> = Result<T, DecoderError>;
374 fn escape_str(wr: &mut fmt::Write, v: &str) -> EncodeResult {
379 for (i, byte) in v.bytes().enumerate() {
380 let escaped = match byte {
383 b'\x00' => "\\u0000",
384 b'\x01' => "\\u0001",
385 b'\x02' => "\\u0002",
386 b'\x03' => "\\u0003",
387 b'\x04' => "\\u0004",
388 b'\x05' => "\\u0005",
389 b'\x06' => "\\u0006",
390 b'\x07' => "\\u0007",
394 b'\x0b' => "\\u000b",
397 b'\x0e' => "\\u000e",
398 b'\x0f' => "\\u000f",
399 b'\x10' => "\\u0010",
400 b'\x11' => "\\u0011",
401 b'\x12' => "\\u0012",
402 b'\x13' => "\\u0013",
403 b'\x14' => "\\u0014",
404 b'\x15' => "\\u0015",
405 b'\x16' => "\\u0016",
406 b'\x17' => "\\u0017",
407 b'\x18' => "\\u0018",
408 b'\x19' => "\\u0019",
409 b'\x1a' => "\\u001a",
410 b'\x1b' => "\\u001b",
411 b'\x1c' => "\\u001c",
412 b'\x1d' => "\\u001d",
413 b'\x1e' => "\\u001e",
414 b'\x1f' => "\\u001f",
415 b'\x7f' => "\\u007f",
420 wr.write_str(&v[start..i])?;
423 wr.write_str(escaped)?;
428 if start != v.len() {
429 wr.write_str(&v[start..])?;
436 fn escape_char(writer: &mut fmt::Write, v: char) -> EncodeResult {
437 escape_str(writer, v.encode_utf8(&mut [0; 4]))
440 fn spaces(wr: &mut fmt::Write, mut n: usize) -> EncodeResult {
441 const BUF: &'static str = " ";
443 while n >= BUF.len() {
449 wr.write_str(&BUF[..n])?;
454 fn fmt_number_or_null(v: f64) -> string::String {
456 Fp::Nan | Fp::Infinite => string::String::from("null"),
457 _ if v.fract() != 0f64 => v.to_string(),
458 _ => v.to_string() + ".0",
462 /// A structure for implementing serialization to JSON.
463 pub struct Encoder<'a> {
464 writer: &'a mut (fmt::Write+'a),
465 is_emitting_map_key: bool,
468 impl<'a> Encoder<'a> {
469 /// Creates a new JSON encoder whose output will be written to the writer
471 pub fn new(writer: &'a mut fmt::Write) -> Encoder<'a> {
472 Encoder { writer: writer, is_emitting_map_key: false, }
476 macro_rules! emit_enquoted_if_mapkey {
477 ($enc:ident,$e:expr) => ({
478 if $enc.is_emitting_map_key {
479 write!($enc.writer, "\"{}\"", $e)?;
481 write!($enc.writer, "{}", $e)?;
487 impl<'a> ::Encoder for Encoder<'a> {
488 type Error = EncoderError;
490 fn emit_nil(&mut self) -> EncodeResult {
491 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
492 write!(self.writer, "null")?;
496 fn emit_usize(&mut self, v: usize) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
497 fn emit_u128(&mut self, v: u128) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
498 fn emit_u64(&mut self, v: u64) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
499 fn emit_u32(&mut self, v: u32) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
500 fn emit_u16(&mut self, v: u16) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
501 fn emit_u8(&mut self, v: u8) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
503 fn emit_isize(&mut self, v: isize) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
504 fn emit_i128(&mut self, v: i128) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
505 fn emit_i64(&mut self, v: i64) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
506 fn emit_i32(&mut self, v: i32) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
507 fn emit_i16(&mut self, v: i16) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
508 fn emit_i8(&mut self, v: i8) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
510 fn emit_bool(&mut self, v: bool) -> EncodeResult {
511 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
513 write!(self.writer, "true")?;
515 write!(self.writer, "false")?;
520 fn emit_f64(&mut self, v: f64) -> EncodeResult {
521 emit_enquoted_if_mapkey!(self, fmt_number_or_null(v))
523 fn emit_f32(&mut self, v: f32) -> EncodeResult {
524 self.emit_f64(v as f64)
527 fn emit_char(&mut self, v: char) -> EncodeResult {
528 escape_char(self.writer, v)
530 fn emit_str(&mut self, v: &str) -> EncodeResult {
531 escape_str(self.writer, v)
534 fn emit_enum<F>(&mut self, _name: &str, f: F) -> EncodeResult where
535 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
540 fn emit_enum_variant<F>(&mut self,
544 f: F) -> EncodeResult where
545 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
547 // enums are encoded as strings or objects
549 // Kangaroo(34,"William") => {"variant": "Kangaroo", "fields": [34,"William"]}
551 escape_str(self.writer, name)
553 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
554 write!(self.writer, "{{\"variant\":")?;
555 escape_str(self.writer, name)?;
556 write!(self.writer, ",\"fields\":[")?;
558 write!(self.writer, "]}}")?;
563 fn emit_enum_variant_arg<F>(&mut self, idx: usize, f: F) -> EncodeResult where
564 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
566 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
568 write!(self.writer, ",")?;
573 fn emit_enum_struct_variant<F>(&mut self,
577 f: F) -> EncodeResult where
578 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
580 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
581 self.emit_enum_variant(name, id, cnt, f)
584 fn emit_enum_struct_variant_field<F>(&mut self,
587 f: F) -> EncodeResult where
588 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
590 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
591 self.emit_enum_variant_arg(idx, f)
594 fn emit_struct<F>(&mut self, _: &str, _: usize, f: F) -> EncodeResult where
595 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
597 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
598 write!(self.writer, "{{")?;
600 write!(self.writer, "}}")?;
604 fn emit_struct_field<F>(&mut self, name: &str, idx: usize, f: F) -> EncodeResult where
605 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
607 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
608 if idx != 0 { write!(self.writer, ",")?; }
609 escape_str(self.writer, name)?;
610 write!(self.writer, ":")?;
614 fn emit_tuple<F>(&mut self, len: usize, f: F) -> EncodeResult where
615 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
617 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
618 self.emit_seq(len, f)
620 fn emit_tuple_arg<F>(&mut self, idx: usize, f: F) -> EncodeResult where
621 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
623 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
624 self.emit_seq_elt(idx, f)
627 fn emit_tuple_struct<F>(&mut self, _name: &str, len: usize, f: F) -> EncodeResult where
628 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
630 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
631 self.emit_seq(len, f)
633 fn emit_tuple_struct_arg<F>(&mut self, idx: usize, f: F) -> EncodeResult where
634 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
636 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
637 self.emit_seq_elt(idx, f)
640 fn emit_option<F>(&mut self, f: F) -> EncodeResult where
641 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
643 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
646 fn emit_option_none(&mut self) -> EncodeResult {
647 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
650 fn emit_option_some<F>(&mut self, f: F) -> EncodeResult where
651 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
653 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
657 fn emit_seq<F>(&mut self, _len: usize, f: F) -> EncodeResult where
658 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
660 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
661 write!(self.writer, "[")?;
663 write!(self.writer, "]")?;
667 fn emit_seq_elt<F>(&mut self, idx: usize, f: F) -> EncodeResult where
668 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
670 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
672 write!(self.writer, ",")?;
677 fn emit_map<F>(&mut self, _len: usize, f: F) -> EncodeResult where
678 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
680 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
681 write!(self.writer, "{{")?;
683 write!(self.writer, "}}")?;
687 fn emit_map_elt_key<F>(&mut self, idx: usize, f: F) -> EncodeResult where
688 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
690 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
691 if idx != 0 { write!(self.writer, ",")? }
692 self.is_emitting_map_key = true;
694 self.is_emitting_map_key = false;
698 fn emit_map_elt_val<F>(&mut self, _idx: usize, f: F) -> EncodeResult where
699 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
701 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
702 write!(self.writer, ":")?;
707 /// Another encoder for JSON, but prints out human-readable JSON instead of
709 pub struct PrettyEncoder<'a> {
710 writer: &'a mut (fmt::Write+'a),
713 is_emitting_map_key: bool,
716 impl<'a> PrettyEncoder<'a> {
717 /// Creates a new encoder whose output will be written to the specified writer
718 pub fn new(writer: &'a mut fmt::Write) -> PrettyEncoder<'a> {
723 is_emitting_map_key: false,
727 /// Set the number of spaces to indent for each level.
728 /// This is safe to set during encoding.
729 pub fn set_indent(&mut self, indent: usize) {
730 // self.indent very well could be 0 so we need to use checked division.
731 let level = self.curr_indent.checked_div(self.indent).unwrap_or(0);
732 self.indent = indent;
733 self.curr_indent = level * self.indent;
737 impl<'a> ::Encoder for PrettyEncoder<'a> {
738 type Error = EncoderError;
740 fn emit_nil(&mut self) -> EncodeResult {
741 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
742 write!(self.writer, "null")?;
746 fn emit_usize(&mut self, v: usize) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
747 fn emit_u128(&mut self, v: u128) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
748 fn emit_u64(&mut self, v: u64) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
749 fn emit_u32(&mut self, v: u32) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
750 fn emit_u16(&mut self, v: u16) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
751 fn emit_u8(&mut self, v: u8) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
753 fn emit_isize(&mut self, v: isize) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
754 fn emit_i128(&mut self, v: i128) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
755 fn emit_i64(&mut self, v: i64) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
756 fn emit_i32(&mut self, v: i32) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
757 fn emit_i16(&mut self, v: i16) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
758 fn emit_i8(&mut self, v: i8) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
760 fn emit_bool(&mut self, v: bool) -> EncodeResult {
761 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
763 write!(self.writer, "true")?;
765 write!(self.writer, "false")?;
770 fn emit_f64(&mut self, v: f64) -> EncodeResult {
771 emit_enquoted_if_mapkey!(self, fmt_number_or_null(v))
773 fn emit_f32(&mut self, v: f32) -> EncodeResult {
774 self.emit_f64(v as f64)
777 fn emit_char(&mut self, v: char) -> EncodeResult {
778 escape_char(self.writer, v)
780 fn emit_str(&mut self, v: &str) -> EncodeResult {
781 escape_str(self.writer, v)
784 fn emit_enum<F>(&mut self, _name: &str, f: F) -> EncodeResult where
785 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
790 fn emit_enum_variant<F>(&mut self,
795 -> EncodeResult where
796 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
799 escape_str(self.writer, name)
801 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
802 write!(self.writer, "{{\n")?;
803 self.curr_indent += self.indent;
804 spaces(self.writer, self.curr_indent)?;
805 write!(self.writer, "\"variant\": ")?;
806 escape_str(self.writer, name)?;
807 write!(self.writer, ",\n")?;
808 spaces(self.writer, self.curr_indent)?;
809 write!(self.writer, "\"fields\": [\n")?;
810 self.curr_indent += self.indent;
812 self.curr_indent -= self.indent;
813 write!(self.writer, "\n")?;
814 spaces(self.writer, self.curr_indent)?;
815 self.curr_indent -= self.indent;
816 write!(self.writer, "]\n")?;
817 spaces(self.writer, self.curr_indent)?;
818 write!(self.writer, "}}")?;
823 fn emit_enum_variant_arg<F>(&mut self, idx: usize, f: F) -> EncodeResult where
824 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
826 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
828 write!(self.writer, ",\n")?;
830 spaces(self.writer, self.curr_indent)?;
834 fn emit_enum_struct_variant<F>(&mut self,
838 f: F) -> EncodeResult where
839 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
841 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
842 self.emit_enum_variant(name, id, cnt, f)
845 fn emit_enum_struct_variant_field<F>(&mut self,
848 f: F) -> EncodeResult where
849 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
851 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
852 self.emit_enum_variant_arg(idx, f)
856 fn emit_struct<F>(&mut self, _: &str, len: usize, f: F) -> EncodeResult where
857 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
859 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
861 write!(self.writer, "{{}}")?;
863 write!(self.writer, "{{")?;
864 self.curr_indent += self.indent;
866 self.curr_indent -= self.indent;
867 write!(self.writer, "\n")?;
868 spaces(self.writer, self.curr_indent)?;
869 write!(self.writer, "}}")?;
874 fn emit_struct_field<F>(&mut self, name: &str, idx: usize, f: F) -> EncodeResult where
875 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
877 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
879 write!(self.writer, "\n")?;
881 write!(self.writer, ",\n")?;
883 spaces(self.writer, self.curr_indent)?;
884 escape_str(self.writer, name)?;
885 write!(self.writer, ": ")?;
889 fn emit_tuple<F>(&mut self, len: usize, f: F) -> EncodeResult where
890 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
892 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
893 self.emit_seq(len, f)
895 fn emit_tuple_arg<F>(&mut self, idx: usize, f: F) -> EncodeResult where
896 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
898 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
899 self.emit_seq_elt(idx, f)
902 fn emit_tuple_struct<F>(&mut self, _: &str, len: usize, f: F) -> EncodeResult where
903 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
905 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
906 self.emit_seq(len, f)
908 fn emit_tuple_struct_arg<F>(&mut self, idx: usize, f: F) -> EncodeResult where
909 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
911 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
912 self.emit_seq_elt(idx, f)
915 fn emit_option<F>(&mut self, f: F) -> EncodeResult where
916 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
918 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
921 fn emit_option_none(&mut self) -> EncodeResult {
922 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
925 fn emit_option_some<F>(&mut self, f: F) -> EncodeResult where
926 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
928 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
932 fn emit_seq<F>(&mut self, len: usize, f: F) -> EncodeResult where
933 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
935 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
937 write!(self.writer, "[]")?;
939 write!(self.writer, "[")?;
940 self.curr_indent += self.indent;
942 self.curr_indent -= self.indent;
943 write!(self.writer, "\n")?;
944 spaces(self.writer, self.curr_indent)?;
945 write!(self.writer, "]")?;
950 fn emit_seq_elt<F>(&mut self, idx: usize, f: F) -> EncodeResult where
951 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
953 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
955 write!(self.writer, "\n")?;
957 write!(self.writer, ",\n")?;
959 spaces(self.writer, self.curr_indent)?;
963 fn emit_map<F>(&mut self, len: usize, f: F) -> EncodeResult where
964 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
966 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
968 write!(self.writer, "{{}}")?;
970 write!(self.writer, "{{")?;
971 self.curr_indent += self.indent;
973 self.curr_indent -= self.indent;
974 write!(self.writer, "\n")?;
975 spaces(self.writer, self.curr_indent)?;
976 write!(self.writer, "}}")?;
981 fn emit_map_elt_key<F>(&mut self, idx: usize, f: F) -> EncodeResult where
982 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
984 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
986 write!(self.writer, "\n")?;
988 write!(self.writer, ",\n")?;
990 spaces(self.writer, self.curr_indent)?;
991 self.is_emitting_map_key = true;
993 self.is_emitting_map_key = false;
997 fn emit_map_elt_val<F>(&mut self, _idx: usize, f: F) -> EncodeResult where
998 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
1000 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
1001 write!(self.writer, ": ")?;
1006 impl Encodable for Json {
1007 fn encode<E: ::Encoder>(&self, e: &mut E) -> Result<(), E::Error> {
1009 Json::I64(v) => v.encode(e),
1010 Json::U64(v) => v.encode(e),
1011 Json::F64(v) => v.encode(e),
1012 Json::String(ref v) => v.encode(e),
1013 Json::Boolean(v) => v.encode(e),
1014 Json::Array(ref v) => v.encode(e),
1015 Json::Object(ref v) => v.encode(e),
1016 Json::Null => e.emit_nil(),
1021 /// Create an `AsJson` wrapper which can be used to print a value as JSON
1022 /// on-the-fly via `write!`
1023 pub fn as_json<T>(t: &T) -> AsJson<T> {
1027 /// Create an `AsPrettyJson` wrapper which can be used to print a value as JSON
1028 /// on-the-fly via `write!`
1029 pub fn as_pretty_json<T>(t: &T) -> AsPrettyJson<T> {
1030 AsPrettyJson { inner: t, indent: None }
1034 /// Borrow this json object as a pretty object to generate a pretty
1035 /// representation for it via `Display`.
1036 pub fn pretty(&self) -> PrettyJson {
1037 PrettyJson { inner: self }
1040 /// If the Json value is an Object, returns the value associated with the provided key.
1041 /// Otherwise, returns None.
1042 pub fn find<'a>(&'a self, key: &str) -> Option<&'a Json>{
1044 Json::Object(ref map) => map.get(key),
1049 /// Attempts to get a nested Json Object for each key in `keys`.
1050 /// If any key is found not to exist, find_path will return None.
1051 /// Otherwise, it will return the Json value associated with the final key.
1052 pub fn find_path<'a>(&'a self, keys: &[&str]) -> Option<&'a Json>{
1053 let mut target = self;
1055 target = target.find(*key)?;
1060 /// If the Json value is an Object, performs a depth-first search until
1061 /// a value associated with the provided key is found. If no value is found
1062 /// or the Json value is not an Object, returns None.
1063 pub fn search<'a>(&'a self, key: &str) -> Option<&'a Json> {
1065 &Json::Object(ref map) => {
1066 match map.get(key) {
1067 Some(json_value) => Some(json_value),
1070 match v.search(key) {
1071 x if x.is_some() => return x,
1083 /// Returns true if the Json value is an Object. Returns false otherwise.
1084 pub fn is_object(&self) -> bool {
1085 self.as_object().is_some()
1088 /// If the Json value is an Object, returns the associated BTreeMap.
1089 /// Returns None otherwise.
1090 pub fn as_object(&self) -> Option<&Object> {
1092 Json::Object(ref map) => Some(map),
1097 /// Returns true if the Json value is an Array. Returns false otherwise.
1098 pub fn is_array(&self) -> bool {
1099 self.as_array().is_some()
1102 /// If the Json value is an Array, returns the associated vector.
1103 /// Returns None otherwise.
1104 pub fn as_array(&self) -> Option<&Array> {
1106 Json::Array(ref array) => Some(&*array),
1111 /// Returns true if the Json value is a String. Returns false otherwise.
1112 pub fn is_string(&self) -> bool {
1113 self.as_string().is_some()
1116 /// If the Json value is a String, returns the associated str.
1117 /// Returns None otherwise.
1118 pub fn as_string(&self) -> Option<&str> {
1120 Json::String(ref s) => Some(&s[..]),
1125 /// Returns true if the Json value is a Number. Returns false otherwise.
1126 pub fn is_number(&self) -> bool {
1128 Json::I64(_) | Json::U64(_) | Json::F64(_) => true,
1133 /// Returns true if the Json value is a i64. Returns false otherwise.
1134 pub fn is_i64(&self) -> bool {
1136 Json::I64(_) => true,
1141 /// Returns true if the Json value is a u64. Returns false otherwise.
1142 pub fn is_u64(&self) -> bool {
1144 Json::U64(_) => true,
1149 /// Returns true if the Json value is a f64. Returns false otherwise.
1150 pub fn is_f64(&self) -> bool {
1152 Json::F64(_) => true,
1157 /// If the Json value is a number, return or cast it to a i64.
1158 /// Returns None otherwise.
1159 pub fn as_i64(&self) -> Option<i64> {
1161 Json::I64(n) => Some(n),
1162 Json::U64(n) => Some(n as i64),
1167 /// If the Json value is a number, return or cast it to a u64.
1168 /// Returns None otherwise.
1169 pub fn as_u64(&self) -> Option<u64> {
1171 Json::I64(n) => Some(n as u64),
1172 Json::U64(n) => Some(n),
1177 /// If the Json value is a number, return or cast it to a f64.
1178 /// Returns None otherwise.
1179 pub fn as_f64(&self) -> Option<f64> {
1181 Json::I64(n) => Some(n as f64),
1182 Json::U64(n) => Some(n as f64),
1183 Json::F64(n) => Some(n),
1188 /// Returns true if the Json value is a Boolean. Returns false otherwise.
1189 pub fn is_boolean(&self) -> bool {
1190 self.as_boolean().is_some()
1193 /// If the Json value is a Boolean, returns the associated bool.
1194 /// Returns None otherwise.
1195 pub fn as_boolean(&self) -> Option<bool> {
1197 Json::Boolean(b) => Some(b),
1202 /// Returns true if the Json value is a Null. Returns false otherwise.
1203 pub fn is_null(&self) -> bool {
1204 self.as_null().is_some()
1207 /// If the Json value is a Null, returns ().
1208 /// Returns None otherwise.
1209 pub fn as_null(&self) -> Option<()> {
1211 Json::Null => Some(()),
1217 impl<'a> Index<&'a str> for Json {
1220 fn index(&self, idx: &'a str) -> &Json {
1221 self.find(idx).unwrap()
1225 impl Index<usize> for Json {
1228 fn index(&self, idx: usize) -> &Json {
1230 Json::Array(ref v) => &v[idx],
1231 _ => panic!("can only index Json with usize if it is an array")
1236 /// The output of the streaming parser.
1237 #[derive(PartialEq, Clone, Debug)]
1238 pub enum JsonEvent {
1247 StringValue(string::String),
1252 #[derive(PartialEq, Debug)]
1254 // Parse a value in an array, true means first element.
1256 // Parse ',' or ']' after an element in an array.
1258 // Parse a key:value in an object, true means first element.
1260 // Parse ',' or ']' after an element in an object.
1264 // Expecting the stream to end.
1266 // Parsing can't continue.
1270 /// A Stack represents the current position of the parser in the logical
1271 /// structure of the JSON stream.
1272 /// For example foo.bar[3].x
1274 stack: Vec<InternalStackElement>,
1275 str_buffer: Vec<u8>,
1278 /// StackElements compose a Stack.
1279 /// For example, StackElement::Key("foo"), StackElement::Key("bar"),
1280 /// StackElement::Index(3) and StackElement::Key("x") are the
1281 /// StackElements compositing the stack that represents foo.bar[3].x
1282 #[derive(PartialEq, Clone, Debug)]
1283 pub enum StackElement<'l> {
1288 // Internally, Key elements are stored as indices in a buffer to avoid
1289 // allocating a string for every member of an object.
1290 #[derive(PartialEq, Clone, Debug)]
1291 enum InternalStackElement {
1293 InternalKey(u16, u16), // start, size
1297 pub fn new() -> Stack {
1298 Stack { stack: Vec::new(), str_buffer: Vec::new() }
1301 /// Returns The number of elements in the Stack.
1302 pub fn len(&self) -> usize { self.stack.len() }
1304 /// Returns true if the stack is empty.
1305 pub fn is_empty(&self) -> bool { self.stack.is_empty() }
1307 /// Provides access to the StackElement at a given index.
1308 /// lower indices are at the bottom of the stack while higher indices are
1310 pub fn get(&self, idx: usize) -> StackElement {
1311 match self.stack[idx] {
1312 InternalIndex(i) => StackElement::Index(i),
1313 InternalKey(start, size) => {
1314 StackElement::Key(str::from_utf8(
1315 &self.str_buffer[start as usize .. start as usize + size as usize])
1321 /// Compares this stack with an array of StackElements.
1322 pub fn is_equal_to(&self, rhs: &[StackElement]) -> bool {
1323 if self.stack.len() != rhs.len() { return false; }
1324 for (i, r) in rhs.iter().enumerate() {
1325 if self.get(i) != *r { return false; }
1330 /// Returns true if the bottom-most elements of this stack are the same as
1331 /// the ones passed as parameter.
1332 pub fn starts_with(&self, rhs: &[StackElement]) -> bool {
1333 if self.stack.len() < rhs.len() { return false; }
1334 for (i, r) in rhs.iter().enumerate() {
1335 if self.get(i) != *r { return false; }
1340 /// Returns true if the top-most elements of this stack are the same as
1341 /// the ones passed as parameter.
1342 pub fn ends_with(&self, rhs: &[StackElement]) -> bool {
1343 if self.stack.len() < rhs.len() { return false; }
1344 let offset = self.stack.len() - rhs.len();
1345 for (i, r) in rhs.iter().enumerate() {
1346 if self.get(i + offset) != *r { return false; }
1351 /// Returns the top-most element (if any).
1352 pub fn top(&self) -> Option<StackElement> {
1353 match self.stack.last() {
1355 Some(&InternalIndex(i)) => Some(StackElement::Index(i)),
1356 Some(&InternalKey(start, size)) => {
1357 Some(StackElement::Key(str::from_utf8(
1358 &self.str_buffer[start as usize .. (start+size) as usize]
1364 // Used by Parser to insert StackElement::Key elements at the top of the stack.
1365 fn push_key(&mut self, key: string::String) {
1366 self.stack.push(InternalKey(self.str_buffer.len() as u16, key.len() as u16));
1367 for c in key.as_bytes() {
1368 self.str_buffer.push(*c);
1372 // Used by Parser to insert StackElement::Index elements at the top of the stack.
1373 fn push_index(&mut self, index: u32) {
1374 self.stack.push(InternalIndex(index));
1377 // Used by Parser to remove the top-most element of the stack.
1379 assert!(!self.is_empty());
1380 match *self.stack.last().unwrap() {
1381 InternalKey(_, sz) => {
1382 let new_size = self.str_buffer.len() - sz as usize;
1383 self.str_buffer.truncate(new_size);
1385 InternalIndex(_) => {}
1390 // Used by Parser to test whether the top-most element is an index.
1391 fn last_is_index(&self) -> bool {
1392 if self.is_empty() { return false; }
1393 return match *self.stack.last().unwrap() {
1394 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); }
1537 let res = (res as i64).wrapping_neg();
1539 // Make sure we didn't underflow.
1541 Error(SyntaxError(InvalidNumber, self.line, self.col))
1551 fn parse_u64(&mut self) -> Result<u64, ParserError> {
1552 let mut accum = 0u64;
1553 let last_accum = 0; // necessary to detect overflow.
1555 match self.ch_or_null() {
1559 // A leading '0' must be the only digit before the decimal point.
1560 if let '0' ..= '9' = self.ch_or_null() {
1561 return self.error(InvalidNumber)
1566 match self.ch_or_null() {
1567 c @ '0' ..= '9' => {
1568 accum = accum.wrapping_mul(10);
1569 accum = accum.wrapping_add((c as u64) - ('0' as u64));
1571 // Detect overflow by comparing to the last value.
1572 if accum <= last_accum { return self.error(InvalidNumber); }
1580 _ => return self.error(InvalidNumber),
1586 fn parse_decimal(&mut self, mut res: f64) -> Result<f64, ParserError> {
1589 // Make sure a digit follows the decimal place.
1590 match self.ch_or_null() {
1592 _ => return self.error(InvalidNumber)
1597 match self.ch_or_null() {
1598 c @ '0' ..= '9' => {
1600 res += (((c as isize) - ('0' as isize)) as f64) * dec;
1610 fn parse_exponent(&mut self, mut res: f64) -> Result<f64, ParserError> {
1614 let mut neg_exp = false;
1616 if self.ch_is('+') {
1618 } else if self.ch_is('-') {
1623 // Make sure a digit follows the exponent place.
1624 match self.ch_or_null() {
1626 _ => return self.error(InvalidNumber)
1629 match self.ch_or_null() {
1630 c @ '0' ..= '9' => {
1632 exp += (c as usize) - ('0' as usize);
1640 let exp = 10_f64.powi(exp as i32);
1650 fn decode_hex_escape(&mut self) -> Result<u16, ParserError> {
1653 while i < 4 && !self.eof() {
1655 n = match self.ch_or_null() {
1656 c @ '0' ..= '9' => n * 16 + ((c as u16) - ('0' as u16)),
1657 'a' | 'A' => n * 16 + 10,
1658 'b' | 'B' => n * 16 + 11,
1659 'c' | 'C' => n * 16 + 12,
1660 'd' | 'D' => n * 16 + 13,
1661 'e' | 'E' => n * 16 + 14,
1662 'f' | 'F' => n * 16 + 15,
1663 _ => return self.error(InvalidEscape)
1669 // Error out if we didn't parse 4 digits.
1671 return self.error(InvalidEscape);
1677 fn parse_str(&mut self) -> Result<string::String, ParserError> {
1678 let mut escape = false;
1679 let mut res = string::String::new();
1684 return self.error(EOFWhileParsingString);
1688 match self.ch_or_null() {
1689 '"' => res.push('"'),
1690 '\\' => res.push('\\'),
1691 '/' => res.push('/'),
1692 'b' => res.push('\x08'),
1693 'f' => res.push('\x0c'),
1694 'n' => res.push('\n'),
1695 'r' => res.push('\r'),
1696 't' => res.push('\t'),
1697 'u' => match self.decode_hex_escape()? {
1698 0xDC00 ..= 0xDFFF => {
1699 return self.error(LoneLeadingSurrogateInHexEscape)
1702 // Non-BMP characters are encoded as a sequence of
1703 // two hex escapes, representing UTF-16 surrogates.
1704 n1 @ 0xD800 ..= 0xDBFF => {
1705 match (self.next_char(), self.next_char()) {
1706 (Some('\\'), Some('u')) => (),
1707 _ => return self.error(UnexpectedEndOfHexEscape),
1710 let n2 = self.decode_hex_escape()?;
1711 if n2 < 0xDC00 || n2 > 0xDFFF {
1712 return self.error(LoneLeadingSurrogateInHexEscape)
1714 let c = (((n1 - 0xD800) as u32) << 10 |
1715 (n2 - 0xDC00) as u32) + 0x1_0000;
1716 res.push(char::from_u32(c).unwrap());
1719 n => match char::from_u32(n as u32) {
1720 Some(c) => res.push(c),
1721 None => return self.error(InvalidUnicodeCodePoint),
1724 _ => return self.error(InvalidEscape),
1727 } else if self.ch_is('\\') {
1735 Some(c) => res.push(c),
1736 None => unreachable!()
1742 // Invoked at each iteration, consumes the stream until it has enough
1743 // information to return a JsonEvent.
1744 // Manages an internal state so that parsing can be interrupted and resumed.
1745 // Also keeps track of the position in the logical structure of the json
1746 // stream isize the form of a stack that can be queried by the user using the
1748 fn parse(&mut self) -> JsonEvent {
1750 // The only paths where the loop can spin a new iteration
1751 // are in the cases ParseArrayComma and ParseObjectComma if ','
1752 // is parsed. In these cases the state is set to (respectively)
1753 // ParseArray(false) and ParseObject(false), which always return,
1754 // so there is no risk of getting stuck in an infinite loop.
1755 // All other paths return before the end of the loop's iteration.
1756 self.parse_whitespace();
1760 return self.parse_start();
1762 ParseArray(first) => {
1763 return self.parse_array(first);
1765 ParseArrayComma => {
1766 if let Some(evt) = self.parse_array_comma_or_end() {
1770 ParseObject(first) => {
1771 return self.parse_object(first);
1773 ParseObjectComma => {
1775 if self.ch_is(',') {
1776 self.state = ParseObject(false);
1779 return self.parse_object_end();
1783 return self.error_event(InvalidSyntax);
1789 fn parse_start(&mut self) -> JsonEvent {
1790 let val = self.parse_value();
1791 self.state = match val {
1792 Error(_) => ParseFinished,
1793 ArrayStart => ParseArray(true),
1794 ObjectStart => ParseObject(true),
1795 _ => ParseBeforeFinish,
1800 fn parse_array(&mut self, first: bool) -> JsonEvent {
1801 if self.ch_is(']') {
1803 self.error_event(InvalidSyntax)
1805 self.state = if self.stack.is_empty() {
1807 } else if self.stack.last_is_index() {
1817 self.stack.push_index(0);
1819 let val = self.parse_value();
1820 self.state = match val {
1821 Error(_) => ParseFinished,
1822 ArrayStart => ParseArray(true),
1823 ObjectStart => ParseObject(true),
1824 _ => ParseArrayComma,
1830 fn parse_array_comma_or_end(&mut self) -> Option<JsonEvent> {
1831 if self.ch_is(',') {
1832 self.stack.bump_index();
1833 self.state = ParseArray(false);
1836 } else if self.ch_is(']') {
1838 self.state = if self.stack.is_empty() {
1840 } else if self.stack.last_is_index() {
1847 } else if self.eof() {
1848 Some(self.error_event(EOFWhileParsingArray))
1850 Some(self.error_event(InvalidSyntax))
1854 fn parse_object(&mut self, first: bool) -> JsonEvent {
1855 if self.ch_is('}') {
1857 if self.stack.is_empty() {
1858 return self.error_event(TrailingComma);
1863 self.state = if self.stack.is_empty() {
1865 } else if self.stack.last_is_index() {
1874 return self.error_event(EOFWhileParsingObject);
1876 if !self.ch_is('"') {
1877 return self.error_event(KeyMustBeAString);
1879 let s = match self.parse_str() {
1882 self.state = ParseFinished;
1886 self.parse_whitespace();
1888 return self.error_event(EOFWhileParsingObject);
1889 } else if self.ch_or_null() != ':' {
1890 return self.error_event(ExpectedColon);
1892 self.stack.push_key(s);
1894 self.parse_whitespace();
1896 let val = self.parse_value();
1898 self.state = match val {
1899 Error(_) => ParseFinished,
1900 ArrayStart => ParseArray(true),
1901 ObjectStart => ParseObject(true),
1902 _ => ParseObjectComma,
1907 fn parse_object_end(&mut self) -> JsonEvent {
1908 if self.ch_is('}') {
1909 self.state = if self.stack.is_empty() {
1911 } else if self.stack.last_is_index() {
1918 } else if self.eof() {
1919 self.error_event(EOFWhileParsingObject)
1921 self.error_event(InvalidSyntax)
1925 fn parse_value(&mut self) -> JsonEvent {
1926 if self.eof() { return self.error_event(EOFWhileParsingValue); }
1927 match self.ch_or_null() {
1928 'n' => { self.parse_ident("ull", NullValue) }
1929 't' => { self.parse_ident("rue", BooleanValue(true)) }
1930 'f' => { self.parse_ident("alse", BooleanValue(false)) }
1931 '0' ..= '9' | '-' => self.parse_number(),
1932 '"' => match self.parse_str() {
1933 Ok(s) => StringValue(s),
1944 _ => { self.error_event(InvalidSyntax) }
1948 fn parse_ident(&mut self, ident: &str, value: JsonEvent) -> JsonEvent {
1949 if ident.chars().all(|c| Some(c) == self.next_char()) {
1953 Error(SyntaxError(InvalidSyntax, self.line, self.col))
1957 fn error_event(&mut self, reason: ErrorCode) -> JsonEvent {
1958 self.state = ParseFinished;
1959 Error(SyntaxError(reason, self.line, self.col))
1963 /// A Builder consumes a json::Parser to create a generic Json structure.
1964 pub struct Builder<T> {
1966 token: Option<JsonEvent>,
1969 impl<T: Iterator<Item=char>> Builder<T> {
1970 /// Create a JSON Builder.
1971 pub fn new(src: T) -> Builder<T> {
1972 Builder { parser: Parser::new(src), token: None, }
1975 // Decode a Json value from a Parser.
1976 pub fn build(&mut self) -> Result<Json, BuilderError> {
1978 let result = self.build_value();
1982 Some(Error(ref e)) => { return Err(e.clone()); }
1983 ref tok => { panic!("unexpected token {:?}", tok.clone()); }
1988 fn bump(&mut self) {
1989 self.token = self.parser.next();
1992 fn build_value(&mut self) -> Result<Json, BuilderError> {
1994 Some(NullValue) => Ok(Json::Null),
1995 Some(I64Value(n)) => Ok(Json::I64(n)),
1996 Some(U64Value(n)) => Ok(Json::U64(n)),
1997 Some(F64Value(n)) => Ok(Json::F64(n)),
1998 Some(BooleanValue(b)) => Ok(Json::Boolean(b)),
1999 Some(StringValue(ref mut s)) => {
2000 let mut temp = string::String::new();
2002 Ok(Json::String(temp))
2004 Some(Error(ref e)) => Err(e.clone()),
2005 Some(ArrayStart) => self.build_array(),
2006 Some(ObjectStart) => self.build_object(),
2007 Some(ObjectEnd) => self.parser.error(InvalidSyntax),
2008 Some(ArrayEnd) => self.parser.error(InvalidSyntax),
2009 None => self.parser.error(EOFWhileParsingValue),
2013 fn build_array(&mut self) -> Result<Json, BuilderError> {
2015 let mut values = Vec::new();
2018 if self.token == Some(ArrayEnd) {
2019 return Ok(Json::Array(values.into_iter().collect()));
2021 match self.build_value() {
2022 Ok(v) => values.push(v),
2023 Err(e) => { return Err(e) }
2029 fn build_object(&mut self) -> Result<Json, BuilderError> {
2032 let mut values = BTreeMap::new();
2036 Some(ObjectEnd) => { return Ok(Json::Object(values)); }
2037 Some(Error(ref e)) => { return Err(e.clone()); }
2041 let key = match self.parser.stack().top() {
2042 Some(StackElement::Key(k)) => { k.to_owned() }
2043 _ => { panic!("invalid state"); }
2045 match self.build_value() {
2046 Ok(value) => { values.insert(key, value); }
2047 Err(e) => { return Err(e); }
2051 self.parser.error(EOFWhileParsingObject)
2055 /// Decodes a json value from an `&mut io::Read`
2056 pub fn from_reader(rdr: &mut Read) -> Result<Json, BuilderError> {
2057 let mut contents = Vec::new();
2058 match rdr.read_to_end(&mut contents) {
2060 Err(e) => return Err(io_error_to_error(e))
2062 let s = match str::from_utf8(&contents).ok() {
2064 _ => return Err(SyntaxError(NotUtf8, 0, 0))
2066 let mut builder = Builder::new(s.chars());
2070 /// Decodes a json value from a string
2071 pub fn from_str(s: &str) -> Result<Json, BuilderError> {
2072 let mut builder = Builder::new(s.chars());
2076 /// A structure to decode JSON to values in rust.
2077 pub struct Decoder {
2082 /// Creates a new decoder instance for decoding the specified JSON value.
2083 pub fn new(json: Json) -> Decoder {
2084 Decoder { stack: vec![json] }
2087 fn pop(&mut self) -> Json {
2088 self.stack.pop().unwrap()
2092 macro_rules! expect {
2093 ($e:expr, Null) => ({
2095 Json::Null => Ok(()),
2096 other => Err(ExpectedError("Null".to_owned(),
2097 format!("{}", other)))
2100 ($e:expr, $t:ident) => ({
2102 Json::$t(v) => Ok(v),
2104 Err(ExpectedError(stringify!($t).to_owned(),
2105 format!("{}", other)))
2111 macro_rules! read_primitive {
2112 ($name:ident, $ty:ty) => {
2113 fn $name(&mut self) -> DecodeResult<$ty> {
2115 Json::I64(f) => Ok(f as $ty),
2116 Json::U64(f) => Ok(f as $ty),
2117 Json::F64(f) => Err(ExpectedError("Integer".to_owned(), format!("{}", f))),
2118 // re: #12967.. a type w/ numeric keys (ie HashMap<usize, V> etc)
2119 // is going to have a string here, as per JSON spec.
2120 Json::String(s) => match s.parse().ok() {
2122 None => Err(ExpectedError("Number".to_owned(), s)),
2124 value => Err(ExpectedError("Number".to_owned(), format!("{}", value))),
2130 impl ::Decoder for Decoder {
2131 type Error = DecoderError;
2133 fn read_nil(&mut self) -> DecodeResult<()> {
2134 expect!(self.pop(), Null)
2137 read_primitive! { read_usize, usize }
2138 read_primitive! { read_u8, u8 }
2139 read_primitive! { read_u16, u16 }
2140 read_primitive! { read_u32, u32 }
2141 read_primitive! { read_u64, u64 }
2142 read_primitive! { read_u128, u128 }
2143 read_primitive! { read_isize, isize }
2144 read_primitive! { read_i8, i8 }
2145 read_primitive! { read_i16, i16 }
2146 read_primitive! { read_i32, i32 }
2147 read_primitive! { read_i64, i64 }
2148 read_primitive! { read_i128, i128 }
2150 fn read_f32(&mut self) -> DecodeResult<f32> { self.read_f64().map(|x| x as f32) }
2152 fn read_f64(&mut self) -> DecodeResult<f64> {
2154 Json::I64(f) => Ok(f as f64),
2155 Json::U64(f) => Ok(f as f64),
2156 Json::F64(f) => Ok(f),
2157 Json::String(s) => {
2158 // re: #12967.. a type w/ numeric keys (ie HashMap<usize, V> etc)
2159 // is going to have a string here, as per JSON spec.
2160 match s.parse().ok() {
2162 None => Err(ExpectedError("Number".to_owned(), s)),
2165 Json::Null => Ok(f64::NAN),
2166 value => Err(ExpectedError("Number".to_owned(), format!("{}", value)))
2170 fn read_bool(&mut self) -> DecodeResult<bool> {
2171 expect!(self.pop(), Boolean)
2174 fn read_char(&mut self) -> DecodeResult<char> {
2175 let s = self.read_str()?;
2177 let mut it = s.chars();
2178 match (it.next(), it.next()) {
2179 // exactly one character
2180 (Some(c), None) => return Ok(c),
2184 Err(ExpectedError("single character string".to_owned(), format!("{}", s)))
2187 fn read_str(&mut self) -> DecodeResult<Cow<str>> {
2188 expect!(self.pop(), String).map(Cow::Owned)
2191 fn read_enum<T, F>(&mut self, _name: &str, f: F) -> DecodeResult<T> where
2192 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2197 fn read_enum_variant<T, F>(&mut self, names: &[&str],
2198 mut f: F) -> DecodeResult<T>
2199 where F: FnMut(&mut Decoder, usize) -> DecodeResult<T>,
2201 let name = match self.pop() {
2202 Json::String(s) => s,
2203 Json::Object(mut o) => {
2204 let n = match o.remove(&"variant".to_owned()) {
2205 Some(Json::String(s)) => s,
2207 return Err(ExpectedError("String".to_owned(), format!("{}", val)))
2210 return Err(MissingFieldError("variant".to_owned()))
2213 match o.remove(&"fields".to_string()) {
2214 Some(Json::Array(l)) => {
2215 for field in l.into_iter().rev() {
2216 self.stack.push(field);
2220 return Err(ExpectedError("Array".to_owned(), format!("{}", val)))
2223 return Err(MissingFieldError("fields".to_owned()))
2229 return Err(ExpectedError("String or Object".to_owned(), format!("{}", json)))
2232 let idx = match names.iter().position(|n| *n == &name[..]) {
2234 None => return Err(UnknownVariantError(name))
2239 fn read_enum_variant_arg<T, F>(&mut self, _idx: usize, f: F) -> DecodeResult<T> where
2240 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2245 fn read_enum_struct_variant<T, F>(&mut self, names: &[&str], f: F) -> DecodeResult<T> where
2246 F: FnMut(&mut Decoder, usize) -> DecodeResult<T>,
2248 self.read_enum_variant(names, f)
2252 fn read_enum_struct_variant_field<T, F>(&mut self,
2256 -> DecodeResult<T> where
2257 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2259 self.read_enum_variant_arg(idx, f)
2262 fn read_struct<T, F>(&mut self, _name: &str, _len: usize, f: F) -> DecodeResult<T> where
2263 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2265 let value = f(self)?;
2270 fn read_struct_field<T, F>(&mut self,
2274 -> DecodeResult<T> where
2275 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2277 let mut obj = expect!(self.pop(), Object)?;
2279 let value = match obj.remove(&name.to_string()) {
2281 // Add a Null and try to parse it as an Option<_>
2282 // to get None as a default value.
2283 self.stack.push(Json::Null);
2286 Err(_) => return Err(MissingFieldError(name.to_string())),
2290 self.stack.push(json);
2294 self.stack.push(Json::Object(obj));
2298 fn read_tuple<T, F>(&mut self, tuple_len: usize, f: F) -> DecodeResult<T> where
2299 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2301 self.read_seq(move |d, len| {
2302 if len == tuple_len {
2305 Err(ExpectedError(format!("Tuple{}", tuple_len), format!("Tuple{}", len)))
2310 fn read_tuple_arg<T, F>(&mut self, idx: usize, f: F) -> DecodeResult<T> where
2311 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2313 self.read_seq_elt(idx, f)
2316 fn read_tuple_struct<T, F>(&mut self,
2320 -> DecodeResult<T> where
2321 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2323 self.read_tuple(len, f)
2326 fn read_tuple_struct_arg<T, F>(&mut self,
2329 -> DecodeResult<T> where
2330 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2332 self.read_tuple_arg(idx, f)
2335 fn read_option<T, F>(&mut self, mut f: F) -> DecodeResult<T> where
2336 F: FnMut(&mut Decoder, bool) -> DecodeResult<T>,
2339 Json::Null => f(self, false),
2340 value => { self.stack.push(value); f(self, true) }
2344 fn read_seq<T, F>(&mut self, f: F) -> DecodeResult<T> where
2345 F: FnOnce(&mut Decoder, usize) -> DecodeResult<T>,
2347 let array = expect!(self.pop(), Array)?;
2348 let len = array.len();
2349 for v in array.into_iter().rev() {
2355 fn read_seq_elt<T, F>(&mut self, _idx: usize, f: F) -> DecodeResult<T> where
2356 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2361 fn read_map<T, F>(&mut self, f: F) -> DecodeResult<T> where
2362 F: FnOnce(&mut Decoder, usize) -> DecodeResult<T>,
2364 let obj = expect!(self.pop(), Object)?;
2365 let len = obj.len();
2366 for (key, value) in obj {
2367 self.stack.push(value);
2368 self.stack.push(Json::String(key));
2373 fn read_map_elt_key<T, F>(&mut self, _idx: usize, f: F) -> DecodeResult<T> where
2374 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2379 fn read_map_elt_val<T, F>(&mut self, _idx: usize, f: F) -> DecodeResult<T> where
2380 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2385 fn error(&mut self, err: &str) -> DecoderError {
2386 ApplicationError(err.to_string())
2390 /// A trait for converting values to JSON
2392 /// Converts the value of `self` to an instance of JSON
2393 fn to_json(&self) -> Json;
2396 macro_rules! to_json_impl_i64 {
2398 $(impl ToJson for $t {
2399 fn to_json(&self) -> Json {
2400 Json::I64(*self as i64)
2406 to_json_impl_i64! { isize, i8, i16, i32, i64 }
2408 macro_rules! to_json_impl_u64 {
2410 $(impl ToJson for $t {
2411 fn to_json(&self) -> Json {
2412 Json::U64(*self as u64)
2418 to_json_impl_u64! { usize, u8, u16, u32, u64 }
2420 impl ToJson for Json {
2421 fn to_json(&self) -> Json { self.clone() }
2424 impl ToJson for f32 {
2425 fn to_json(&self) -> Json { (*self as f64).to_json() }
2428 impl ToJson for f64 {
2429 fn to_json(&self) -> Json {
2430 match self.classify() {
2431 Fp::Nan | Fp::Infinite => Json::Null,
2432 _ => Json::F64(*self)
2437 impl ToJson for () {
2438 fn to_json(&self) -> Json { Json::Null }
2441 impl ToJson for bool {
2442 fn to_json(&self) -> Json { Json::Boolean(*self) }
2445 impl ToJson for str {
2446 fn to_json(&self) -> Json { Json::String(self.to_string()) }
2449 impl ToJson for string::String {
2450 fn to_json(&self) -> Json { Json::String((*self).clone()) }
2453 macro_rules! tuple_impl {
2454 // use variables to indicate the arity of the tuple
2455 ($($tyvar:ident),* ) => {
2456 // the trailing commas are for the 1 tuple
2458 $( $tyvar : ToJson ),*
2459 > ToJson for ( $( $tyvar ),* , ) {
2462 #[allow(non_snake_case)]
2463 fn to_json(&self) -> Json {
2465 ($(ref $tyvar),*,) => Json::Array(vec![$($tyvar.to_json()),*])
2474 tuple_impl!{A, B, C}
2475 tuple_impl!{A, B, C, D}
2476 tuple_impl!{A, B, C, D, E}
2477 tuple_impl!{A, B, C, D, E, F}
2478 tuple_impl!{A, B, C, D, E, F, G}
2479 tuple_impl!{A, B, C, D, E, F, G, H}
2480 tuple_impl!{A, B, C, D, E, F, G, H, I}
2481 tuple_impl!{A, B, C, D, E, F, G, H, I, J}
2482 tuple_impl!{A, B, C, D, E, F, G, H, I, J, K}
2483 tuple_impl!{A, B, C, D, E, F, G, H, I, J, K, L}
2485 impl<A: ToJson> ToJson for [A] {
2486 fn to_json(&self) -> Json { Json::Array(self.iter().map(|elt| elt.to_json()).collect()) }
2489 impl<A: ToJson> ToJson for Vec<A> {
2490 fn to_json(&self) -> Json { Json::Array(self.iter().map(|elt| elt.to_json()).collect()) }
2493 impl<A: ToJson> ToJson for BTreeMap<string::String, A> {
2494 fn to_json(&self) -> Json {
2495 let mut d = BTreeMap::new();
2496 for (key, value) in self {
2497 d.insert((*key).clone(), value.to_json());
2503 impl<A: ToJson> ToJson for HashMap<string::String, A> {
2504 fn to_json(&self) -> Json {
2505 let mut d = BTreeMap::new();
2506 for (key, value) in self {
2507 d.insert((*key).clone(), value.to_json());
2513 impl<A:ToJson> ToJson for Option<A> {
2514 fn to_json(&self) -> Json {
2517 Some(ref value) => value.to_json()
2522 struct FormatShim<'a, 'b: 'a> {
2523 inner: &'a mut fmt::Formatter<'b>,
2526 impl<'a, 'b> fmt::Write for FormatShim<'a, 'b> {
2527 fn write_str(&mut self, s: &str) -> fmt::Result {
2528 match self.inner.write_str(s) {
2530 Err(_) => Err(fmt::Error)
2535 impl fmt::Display for Json {
2536 /// Encodes a json value into a string
2537 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
2538 let mut shim = FormatShim { inner: f };
2539 let mut encoder = Encoder::new(&mut shim);
2540 match self.encode(&mut encoder) {
2542 Err(_) => Err(fmt::Error)
2547 impl<'a> fmt::Display for PrettyJson<'a> {
2548 /// Encodes a json value into a string
2549 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
2550 let mut shim = FormatShim { inner: f };
2551 let mut encoder = PrettyEncoder::new(&mut shim);
2552 match self.inner.encode(&mut encoder) {
2554 Err(_) => Err(fmt::Error)
2559 impl<'a, T: Encodable> fmt::Display for AsJson<'a, T> {
2560 /// Encodes a json value into a string
2561 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
2562 let mut shim = FormatShim { inner: f };
2563 let mut encoder = Encoder::new(&mut shim);
2564 match self.inner.encode(&mut encoder) {
2566 Err(_) => Err(fmt::Error)
2571 impl<'a, T> AsPrettyJson<'a, T> {
2572 /// Set the indentation level for the emitted JSON
2573 pub fn indent(mut self, indent: usize) -> AsPrettyJson<'a, T> {
2574 self.indent = Some(indent);
2579 impl<'a, T: Encodable> fmt::Display for AsPrettyJson<'a, T> {
2580 /// Encodes a json value into a string
2581 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
2582 let mut shim = FormatShim { inner: f };
2583 let mut encoder = PrettyEncoder::new(&mut shim);
2584 if let Some(n) = self.indent {
2585 encoder.set_indent(n);
2587 match self.inner.encode(&mut encoder) {
2589 Err(_) => Err(fmt::Error)
2594 impl FromStr for Json {
2595 type Err = BuilderError;
2596 fn from_str(s: &str) -> Result<Json, BuilderError> {
2604 use self::Animal::*;
2605 use self::test::Bencher;
2606 use {Encodable, Decodable};
2608 use super::ErrorCode::*;
2609 use super::ParserError::*;
2610 use super::DecoderError::*;
2611 use super::JsonEvent::*;
2612 use super::{Json, from_str, DecodeResult, DecoderError, JsonEvent, Parser,
2613 StackElement, Stack, Decoder, Encoder, EncoderError};
2614 use std::{i64, u64, f32, f64};
2615 use std::io::prelude::*;
2616 use std::collections::BTreeMap;
2619 #[derive(RustcDecodable, Eq, PartialEq, Debug)]
2625 fn test_decode_option_none() {
2627 let obj: OptionData = super::decode(s).unwrap();
2628 assert_eq!(obj, OptionData { opt: None });
2632 fn test_decode_option_some() {
2633 let s = "{ \"opt\": 10 }";
2634 let obj: OptionData = super::decode(s).unwrap();
2635 assert_eq!(obj, OptionData { opt: Some(10) });
2639 fn test_decode_option_malformed() {
2640 check_err::<OptionData>("{ \"opt\": [] }",
2641 ExpectedError("Number".to_string(), "[]".to_string()));
2642 check_err::<OptionData>("{ \"opt\": false }",
2643 ExpectedError("Number".to_string(), "false".to_string()));
2646 #[derive(PartialEq, RustcEncodable, RustcDecodable, Debug)]
2649 Frog(string::String, isize)
2652 #[derive(PartialEq, RustcEncodable, RustcDecodable, Debug)]
2656 c: Vec<string::String>,
2659 #[derive(PartialEq, RustcEncodable, RustcDecodable, Debug)]
2664 fn mk_object(items: &[(string::String, Json)]) -> Json {
2665 let mut d = BTreeMap::new();
2669 (ref key, ref value) => { d.insert((*key).clone(), (*value).clone()); },
2677 fn test_from_str_trait() {
2679 assert!(s.parse::<Json>().unwrap() == s.parse().unwrap());
2683 fn test_write_null() {
2684 assert_eq!(Null.to_string(), "null");
2685 assert_eq!(Null.pretty().to_string(), "null");
2689 fn test_write_i64() {
2690 assert_eq!(U64(0).to_string(), "0");
2691 assert_eq!(U64(0).pretty().to_string(), "0");
2693 assert_eq!(U64(1234).to_string(), "1234");
2694 assert_eq!(U64(1234).pretty().to_string(), "1234");
2696 assert_eq!(I64(-5678).to_string(), "-5678");
2697 assert_eq!(I64(-5678).pretty().to_string(), "-5678");
2699 assert_eq!(U64(7650007200025252000).to_string(), "7650007200025252000");
2700 assert_eq!(U64(7650007200025252000).pretty().to_string(), "7650007200025252000");
2704 fn test_write_f64() {
2705 assert_eq!(F64(3.0).to_string(), "3.0");
2706 assert_eq!(F64(3.0).pretty().to_string(), "3.0");
2708 assert_eq!(F64(3.1).to_string(), "3.1");
2709 assert_eq!(F64(3.1).pretty().to_string(), "3.1");
2711 assert_eq!(F64(-1.5).to_string(), "-1.5");
2712 assert_eq!(F64(-1.5).pretty().to_string(), "-1.5");
2714 assert_eq!(F64(0.5).to_string(), "0.5");
2715 assert_eq!(F64(0.5).pretty().to_string(), "0.5");
2717 assert_eq!(F64(f64::NAN).to_string(), "null");
2718 assert_eq!(F64(f64::NAN).pretty().to_string(), "null");
2720 assert_eq!(F64(f64::INFINITY).to_string(), "null");
2721 assert_eq!(F64(f64::INFINITY).pretty().to_string(), "null");
2723 assert_eq!(F64(f64::NEG_INFINITY).to_string(), "null");
2724 assert_eq!(F64(f64::NEG_INFINITY).pretty().to_string(), "null");
2728 fn test_write_str() {
2729 assert_eq!(String("".to_string()).to_string(), "\"\"");
2730 assert_eq!(String("".to_string()).pretty().to_string(), "\"\"");
2732 assert_eq!(String("homura".to_string()).to_string(), "\"homura\"");
2733 assert_eq!(String("madoka".to_string()).pretty().to_string(), "\"madoka\"");
2737 fn test_write_bool() {
2738 assert_eq!(Boolean(true).to_string(), "true");
2739 assert_eq!(Boolean(true).pretty().to_string(), "true");
2741 assert_eq!(Boolean(false).to_string(), "false");
2742 assert_eq!(Boolean(false).pretty().to_string(), "false");
2746 fn test_write_array() {
2747 assert_eq!(Array(vec![]).to_string(), "[]");
2748 assert_eq!(Array(vec![]).pretty().to_string(), "[]");
2750 assert_eq!(Array(vec![Boolean(true)]).to_string(), "[true]");
2752 Array(vec![Boolean(true)]).pretty().to_string(),
2759 let long_test_array = Array(vec![
2762 Array(vec![String("foo\nbar".to_string()), F64(3.5)])]);
2764 assert_eq!(long_test_array.to_string(),
2765 "[false,null,[\"foo\\nbar\",3.5]]");
2767 long_test_array.pretty().to_string(),
2781 fn test_write_object() {
2782 assert_eq!(mk_object(&[]).to_string(), "{}");
2783 assert_eq!(mk_object(&[]).pretty().to_string(), "{}");
2787 ("a".to_string(), Boolean(true))
2792 mk_object(&[("a".to_string(), Boolean(true))]).pretty().to_string(),
2799 let complex_obj = mk_object(&[
2800 ("b".to_string(), Array(vec![
2801 mk_object(&[("c".to_string(), String("\x0c\r".to_string()))]),
2802 mk_object(&[("d".to_string(), String("".to_string()))])
2807 complex_obj.to_string(),
2810 {\"c\":\"\\f\\r\"},\
2816 complex_obj.pretty().to_string(),
2821 \"c\": \"\\f\\r\"\n \
2830 let a = mk_object(&[
2831 ("a".to_string(), Boolean(true)),
2832 ("b".to_string(), Array(vec![
2833 mk_object(&[("c".to_string(), String("\x0c\r".to_string()))]),
2834 mk_object(&[("d".to_string(), String("".to_string()))])
2838 // We can't compare the strings directly because the object fields be
2839 // printed in a different order.
2840 assert_eq!(a.clone(), a.to_string().parse().unwrap());
2841 assert_eq!(a.clone(), a.pretty().to_string().parse().unwrap());
2845 fn test_write_enum() {
2848 format!("{}", super::as_json(&animal)),
2852 format!("{}", super::as_pretty_json(&animal)),
2856 let animal = Frog("Henry".to_string(), 349);
2858 format!("{}", super::as_json(&animal)),
2859 "{\"variant\":\"Frog\",\"fields\":[\"Henry\",349]}"
2862 format!("{}", super::as_pretty_json(&animal)),
2864 \"variant\": \"Frog\",\n \
2873 macro_rules! check_encoder_for_simple {
2874 ($value:expr, $expected:expr) => ({
2875 let s = format!("{}", super::as_json(&$value));
2876 assert_eq!(s, $expected);
2878 let s = format!("{}", super::as_pretty_json(&$value));
2879 assert_eq!(s, $expected);
2884 fn test_write_some() {
2885 check_encoder_for_simple!(Some("jodhpurs".to_string()), "\"jodhpurs\"");
2889 fn test_write_none() {
2890 check_encoder_for_simple!(None::<string::String>, "null");
2894 fn test_write_char() {
2895 check_encoder_for_simple!('a', "\"a\"");
2896 check_encoder_for_simple!('\t', "\"\\t\"");
2897 check_encoder_for_simple!('\u{0000}', "\"\\u0000\"");
2898 check_encoder_for_simple!('\u{001b}', "\"\\u001b\"");
2899 check_encoder_for_simple!('\u{007f}', "\"\\u007f\"");
2900 check_encoder_for_simple!('\u{00a0}', "\"\u{00a0}\"");
2901 check_encoder_for_simple!('\u{abcd}', "\"\u{abcd}\"");
2902 check_encoder_for_simple!('\u{10ffff}', "\"\u{10ffff}\"");
2906 fn test_trailing_characters() {
2907 assert_eq!(from_str("nulla"), Err(SyntaxError(TrailingCharacters, 1, 5)));
2908 assert_eq!(from_str("truea"), Err(SyntaxError(TrailingCharacters, 1, 5)));
2909 assert_eq!(from_str("falsea"), Err(SyntaxError(TrailingCharacters, 1, 6)));
2910 assert_eq!(from_str("1a"), Err(SyntaxError(TrailingCharacters, 1, 2)));
2911 assert_eq!(from_str("[]a"), Err(SyntaxError(TrailingCharacters, 1, 3)));
2912 assert_eq!(from_str("{}a"), Err(SyntaxError(TrailingCharacters, 1, 3)));
2916 fn test_read_identifiers() {
2917 assert_eq!(from_str("n"), Err(SyntaxError(InvalidSyntax, 1, 2)));
2918 assert_eq!(from_str("nul"), Err(SyntaxError(InvalidSyntax, 1, 4)));
2919 assert_eq!(from_str("t"), Err(SyntaxError(InvalidSyntax, 1, 2)));
2920 assert_eq!(from_str("truz"), Err(SyntaxError(InvalidSyntax, 1, 4)));
2921 assert_eq!(from_str("f"), Err(SyntaxError(InvalidSyntax, 1, 2)));
2922 assert_eq!(from_str("faz"), Err(SyntaxError(InvalidSyntax, 1, 3)));
2924 assert_eq!(from_str("null"), Ok(Null));
2925 assert_eq!(from_str("true"), Ok(Boolean(true)));
2926 assert_eq!(from_str("false"), Ok(Boolean(false)));
2927 assert_eq!(from_str(" null "), Ok(Null));
2928 assert_eq!(from_str(" true "), Ok(Boolean(true)));
2929 assert_eq!(from_str(" false "), Ok(Boolean(false)));
2933 fn test_decode_identifiers() {
2934 let v: () = super::decode("null").unwrap();
2937 let v: bool = super::decode("true").unwrap();
2938 assert_eq!(v, true);
2940 let v: bool = super::decode("false").unwrap();
2941 assert_eq!(v, false);
2945 fn test_read_number() {
2946 assert_eq!(from_str("+"), Err(SyntaxError(InvalidSyntax, 1, 1)));
2947 assert_eq!(from_str("."), Err(SyntaxError(InvalidSyntax, 1, 1)));
2948 assert_eq!(from_str("NaN"), Err(SyntaxError(InvalidSyntax, 1, 1)));
2949 assert_eq!(from_str("-"), Err(SyntaxError(InvalidNumber, 1, 2)));
2950 assert_eq!(from_str("00"), Err(SyntaxError(InvalidNumber, 1, 2)));
2951 assert_eq!(from_str("1."), Err(SyntaxError(InvalidNumber, 1, 3)));
2952 assert_eq!(from_str("1e"), Err(SyntaxError(InvalidNumber, 1, 3)));
2953 assert_eq!(from_str("1e+"), Err(SyntaxError(InvalidNumber, 1, 4)));
2955 assert_eq!(from_str("18446744073709551616"), Err(SyntaxError(InvalidNumber, 1, 20)));
2956 assert_eq!(from_str("-9223372036854775809"), Err(SyntaxError(InvalidNumber, 1, 21)));
2958 assert_eq!(from_str("3"), Ok(U64(3)));
2959 assert_eq!(from_str("3.1"), Ok(F64(3.1)));
2960 assert_eq!(from_str("-1.2"), Ok(F64(-1.2)));
2961 assert_eq!(from_str("0.4"), Ok(F64(0.4)));
2962 assert_eq!(from_str("0.4e5"), Ok(F64(0.4e5)));
2963 assert_eq!(from_str("0.4e+15"), Ok(F64(0.4e15)));
2964 assert_eq!(from_str("0.4e-01"), Ok(F64(0.4e-01)));
2965 assert_eq!(from_str(" 3 "), Ok(U64(3)));
2967 assert_eq!(from_str("-9223372036854775808"), Ok(I64(i64::MIN)));
2968 assert_eq!(from_str("9223372036854775807"), Ok(U64(i64::MAX as u64)));
2969 assert_eq!(from_str("18446744073709551615"), Ok(U64(u64::MAX)));
2973 fn test_decode_numbers() {
2974 let v: f64 = super::decode("3").unwrap();
2977 let v: f64 = super::decode("3.1").unwrap();
2980 let v: f64 = super::decode("-1.2").unwrap();
2981 assert_eq!(v, -1.2);
2983 let v: f64 = super::decode("0.4").unwrap();
2986 let v: f64 = super::decode("0.4e5").unwrap();
2987 assert_eq!(v, 0.4e5);
2989 let v: f64 = super::decode("0.4e15").unwrap();
2990 assert_eq!(v, 0.4e15);
2992 let v: f64 = super::decode("0.4e-01").unwrap();
2993 assert_eq!(v, 0.4e-01);
2995 let v: u64 = super::decode("0").unwrap();
2998 let v: u64 = super::decode("18446744073709551615").unwrap();
2999 assert_eq!(v, u64::MAX);
3001 let v: i64 = super::decode("-9223372036854775808").unwrap();
3002 assert_eq!(v, i64::MIN);
3004 let v: i64 = super::decode("9223372036854775807").unwrap();
3005 assert_eq!(v, i64::MAX);
3007 let res: DecodeResult<i64> = super::decode("765.25");
3008 assert_eq!(res, Err(ExpectedError("Integer".to_string(),
3009 "765.25".to_string())));
3013 fn test_read_str() {
3014 assert_eq!(from_str("\""), Err(SyntaxError(EOFWhileParsingString, 1, 2)));
3015 assert_eq!(from_str("\"lol"), Err(SyntaxError(EOFWhileParsingString, 1, 5)));
3017 assert_eq!(from_str("\"\""), Ok(String("".to_string())));
3018 assert_eq!(from_str("\"foo\""), Ok(String("foo".to_string())));
3019 assert_eq!(from_str("\"\\\"\""), Ok(String("\"".to_string())));
3020 assert_eq!(from_str("\"\\b\""), Ok(String("\x08".to_string())));
3021 assert_eq!(from_str("\"\\n\""), Ok(String("\n".to_string())));
3022 assert_eq!(from_str("\"\\r\""), Ok(String("\r".to_string())));
3023 assert_eq!(from_str("\"\\t\""), Ok(String("\t".to_string())));
3024 assert_eq!(from_str(" \"foo\" "), Ok(String("foo".to_string())));
3025 assert_eq!(from_str("\"\\u12ab\""), Ok(String("\u{12ab}".to_string())));
3026 assert_eq!(from_str("\"\\uAB12\""), Ok(String("\u{AB12}".to_string())));
3030 fn test_decode_str() {
3031 let s = [("\"\"", ""),
3034 ("\"\\b\"", "\x08"),
3038 ("\"\\u12ab\"", "\u{12ab}"),
3039 ("\"\\uAB12\"", "\u{AB12}")];
3042 let v: string::String = super::decode(i).unwrap();
3048 fn test_read_array() {
3049 assert_eq!(from_str("["), Err(SyntaxError(EOFWhileParsingValue, 1, 2)));
3050 assert_eq!(from_str("[1"), Err(SyntaxError(EOFWhileParsingArray, 1, 3)));
3051 assert_eq!(from_str("[1,"), Err(SyntaxError(EOFWhileParsingValue, 1, 4)));
3052 assert_eq!(from_str("[1,]"), Err(SyntaxError(InvalidSyntax, 1, 4)));
3053 assert_eq!(from_str("[6 7]"), Err(SyntaxError(InvalidSyntax, 1, 4)));
3055 assert_eq!(from_str("[]"), Ok(Array(vec![])));
3056 assert_eq!(from_str("[ ]"), Ok(Array(vec![])));
3057 assert_eq!(from_str("[true]"), Ok(Array(vec![Boolean(true)])));
3058 assert_eq!(from_str("[ false ]"), Ok(Array(vec![Boolean(false)])));
3059 assert_eq!(from_str("[null]"), Ok(Array(vec![Null])));
3060 assert_eq!(from_str("[3, 1]"),
3061 Ok(Array(vec![U64(3), U64(1)])));
3062 assert_eq!(from_str("\n[3, 2]\n"),
3063 Ok(Array(vec![U64(3), U64(2)])));
3064 assert_eq!(from_str("[2, [4, 1]]"),
3065 Ok(Array(vec![U64(2), Array(vec![U64(4), U64(1)])])));
3069 fn test_decode_array() {
3070 let v: Vec<()> = super::decode("[]").unwrap();
3073 let v: Vec<()> = super::decode("[null]").unwrap();
3074 assert_eq!(v, [()]);
3076 let v: Vec<bool> = super::decode("[true]").unwrap();
3077 assert_eq!(v, [true]);
3079 let v: Vec<isize> = super::decode("[3, 1]").unwrap();
3080 assert_eq!(v, [3, 1]);
3082 let v: Vec<Vec<usize>> = super::decode("[[3], [1, 2]]").unwrap();
3083 assert_eq!(v, [vec![3], vec![1, 2]]);
3087 fn test_decode_tuple() {
3088 let t: (usize, usize, usize) = super::decode("[1, 2, 3]").unwrap();
3089 assert_eq!(t, (1, 2, 3));
3091 let t: (usize, string::String) = super::decode("[1, \"two\"]").unwrap();
3092 assert_eq!(t, (1, "two".to_string()));
3096 fn test_decode_tuple_malformed_types() {
3097 assert!(super::decode::<(usize, string::String)>("[1, 2]").is_err());
3101 fn test_decode_tuple_malformed_length() {
3102 assert!(super::decode::<(usize, usize)>("[1, 2, 3]").is_err());
3106 fn test_read_object() {
3107 assert_eq!(from_str("{"), Err(SyntaxError(EOFWhileParsingObject, 1, 2)));
3108 assert_eq!(from_str("{ "), Err(SyntaxError(EOFWhileParsingObject, 1, 3)));
3109 assert_eq!(from_str("{1"), Err(SyntaxError(KeyMustBeAString, 1, 2)));
3110 assert_eq!(from_str("{ \"a\""), Err(SyntaxError(EOFWhileParsingObject, 1, 6)));
3111 assert_eq!(from_str("{\"a\""), Err(SyntaxError(EOFWhileParsingObject, 1, 5)));
3112 assert_eq!(from_str("{\"a\" "), Err(SyntaxError(EOFWhileParsingObject, 1, 6)));
3114 assert_eq!(from_str("{\"a\" 1"), Err(SyntaxError(ExpectedColon, 1, 6)));
3115 assert_eq!(from_str("{\"a\":"), Err(SyntaxError(EOFWhileParsingValue, 1, 6)));
3116 assert_eq!(from_str("{\"a\":1"), Err(SyntaxError(EOFWhileParsingObject, 1, 7)));
3117 assert_eq!(from_str("{\"a\":1 1"), Err(SyntaxError(InvalidSyntax, 1, 8)));
3118 assert_eq!(from_str("{\"a\":1,"), Err(SyntaxError(EOFWhileParsingObject, 1, 8)));
3120 assert_eq!(from_str("{}").unwrap(), mk_object(&[]));
3121 assert_eq!(from_str("{\"a\": 3}").unwrap(),
3122 mk_object(&[("a".to_string(), U64(3))]));
3124 assert_eq!(from_str(
3125 "{ \"a\": null, \"b\" : true }").unwrap(),
3127 ("a".to_string(), Null),
3128 ("b".to_string(), Boolean(true))]));
3129 assert_eq!(from_str("\n{ \"a\": null, \"b\" : true }\n").unwrap(),
3131 ("a".to_string(), Null),
3132 ("b".to_string(), Boolean(true))]));
3133 assert_eq!(from_str(
3134 "{\"a\" : 1.0 ,\"b\": [ true ]}").unwrap(),
3136 ("a".to_string(), F64(1.0)),
3137 ("b".to_string(), Array(vec![Boolean(true)]))
3139 assert_eq!(from_str(
3145 { \"c\": {\"d\": null} } \
3149 ("a".to_string(), F64(1.0)),
3150 ("b".to_string(), Array(vec![
3152 String("foo\nbar".to_string()),
3154 ("c".to_string(), mk_object(&[("d".to_string(), Null)]))
3161 fn test_decode_struct() {
3164 { \"a\": null, \"b\": 2, \"c\": [\"abc\", \"xyz\"] }
3168 let v: Outer = super::decode(s).unwrap();
3173 Inner { a: (), b: 2, c: vec!["abc".to_string(), "xyz".to_string()] }
3179 #[derive(RustcDecodable)]
3180 struct FloatStruct {
3185 fn test_decode_struct_with_nan() {
3186 let s = "{\"f\":null,\"a\":[null,123]}";
3187 let obj: FloatStruct = super::decode(s).unwrap();
3188 assert!(obj.f.is_nan());
3189 assert!(obj.a[0].is_nan());
3190 assert_eq!(obj.a[1], 123f64);
3194 fn test_decode_option() {
3195 let value: Option<string::String> = super::decode("null").unwrap();
3196 assert_eq!(value, None);
3198 let value: Option<string::String> = super::decode("\"jodhpurs\"").unwrap();
3199 assert_eq!(value, Some("jodhpurs".to_string()));
3203 fn test_decode_enum() {
3204 let value: Animal = super::decode("\"Dog\"").unwrap();
3205 assert_eq!(value, Dog);
3207 let s = "{\"variant\":\"Frog\",\"fields\":[\"Henry\",349]}";
3208 let value: Animal = super::decode(s).unwrap();
3209 assert_eq!(value, Frog("Henry".to_string(), 349));
3213 fn test_decode_map() {
3214 let s = "{\"a\": \"Dog\", \"b\": {\"variant\":\"Frog\",\
3215 \"fields\":[\"Henry\", 349]}}";
3216 let mut map: BTreeMap<string::String, Animal> = super::decode(s).unwrap();
3218 assert_eq!(map.remove(&"a".to_string()), Some(Dog));
3219 assert_eq!(map.remove(&"b".to_string()), Some(Frog("Henry".to_string(), 349)));
3223 fn test_multiline_errors() {
3224 assert_eq!(from_str("{\n \"foo\":\n \"bar\""),
3225 Err(SyntaxError(EOFWhileParsingObject, 3, 8)));
3228 #[derive(RustcDecodable)]
3230 struct DecodeStruct {
3234 w: Vec<DecodeStruct>
3236 #[derive(RustcDecodable)]
3241 fn check_err<T: Decodable>(to_parse: &'static str, expected: DecoderError) {
3242 let res: DecodeResult<T> = match from_str(to_parse) {
3243 Err(e) => Err(ParseError(e)),
3244 Ok(json) => Decodable::decode(&mut Decoder::new(json))
3247 Ok(_) => panic!("`{:?}` parsed & decoded ok, expecting error `{:?}`",
3248 to_parse, expected),
3249 Err(ParseError(e)) => panic!("`{:?}` is not valid json: {:?}",
3252 assert_eq!(e, expected);
3257 fn test_decode_errors_struct() {
3258 check_err::<DecodeStruct>("[]", ExpectedError("Object".to_string(), "[]".to_string()));
3259 check_err::<DecodeStruct>("{\"x\": true, \"y\": true, \"z\": \"\", \"w\": []}",
3260 ExpectedError("Number".to_string(), "true".to_string()));
3261 check_err::<DecodeStruct>("{\"x\": 1, \"y\": [], \"z\": \"\", \"w\": []}",
3262 ExpectedError("Boolean".to_string(), "[]".to_string()));
3263 check_err::<DecodeStruct>("{\"x\": 1, \"y\": true, \"z\": {}, \"w\": []}",
3264 ExpectedError("String".to_string(), "{}".to_string()));
3265 check_err::<DecodeStruct>("{\"x\": 1, \"y\": true, \"z\": \"\", \"w\": null}",
3266 ExpectedError("Array".to_string(), "null".to_string()));
3267 check_err::<DecodeStruct>("{\"x\": 1, \"y\": true, \"z\": \"\"}",
3268 MissingFieldError("w".to_string()));
3271 fn test_decode_errors_enum() {
3272 check_err::<DecodeEnum>("{}",
3273 MissingFieldError("variant".to_string()));
3274 check_err::<DecodeEnum>("{\"variant\": 1}",
3275 ExpectedError("String".to_string(), "1".to_string()));
3276 check_err::<DecodeEnum>("{\"variant\": \"A\"}",
3277 MissingFieldError("fields".to_string()));
3278 check_err::<DecodeEnum>("{\"variant\": \"A\", \"fields\": null}",
3279 ExpectedError("Array".to_string(), "null".to_string()));
3280 check_err::<DecodeEnum>("{\"variant\": \"C\", \"fields\": []}",
3281 UnknownVariantError("C".to_string()));
3286 let json_value = from_str("{\"dog\" : \"cat\"}").unwrap();
3287 let found_str = json_value.find("dog");
3288 assert!(found_str.unwrap().as_string().unwrap() == "cat");
3292 fn test_find_path(){
3293 let json_value = from_str("{\"dog\":{\"cat\": {\"mouse\" : \"cheese\"}}}").unwrap();
3294 let found_str = json_value.find_path(&["dog", "cat", "mouse"]);
3295 assert!(found_str.unwrap().as_string().unwrap() == "cheese");
3300 let json_value = from_str("{\"dog\":{\"cat\": {\"mouse\" : \"cheese\"}}}").unwrap();
3301 let found_str = json_value.search("mouse").and_then(|j| j.as_string());
3302 assert!(found_str.unwrap() == "cheese");
3307 let json_value = from_str("{\"animals\":[\"dog\",\"cat\",\"mouse\"]}").unwrap();
3308 let ref array = json_value["animals"];
3309 assert_eq!(array[0].as_string().unwrap(), "dog");
3310 assert_eq!(array[1].as_string().unwrap(), "cat");
3311 assert_eq!(array[2].as_string().unwrap(), "mouse");
3315 fn test_is_object(){
3316 let json_value = from_str("{}").unwrap();
3317 assert!(json_value.is_object());
3321 fn test_as_object(){
3322 let json_value = from_str("{}").unwrap();
3323 let json_object = json_value.as_object();
3324 assert!(json_object.is_some());
3329 let json_value = from_str("[1, 2, 3]").unwrap();
3330 assert!(json_value.is_array());
3335 let json_value = from_str("[1, 2, 3]").unwrap();
3336 let json_array = json_value.as_array();
3337 let expected_length = 3;
3338 assert!(json_array.is_some() && json_array.unwrap().len() == expected_length);
3342 fn test_is_string(){
3343 let json_value = from_str("\"dog\"").unwrap();
3344 assert!(json_value.is_string());
3348 fn test_as_string(){
3349 let json_value = from_str("\"dog\"").unwrap();
3350 let json_str = json_value.as_string();
3351 let expected_str = "dog";
3352 assert_eq!(json_str, Some(expected_str));
3356 fn test_is_number(){
3357 let json_value = from_str("12").unwrap();
3358 assert!(json_value.is_number());
3363 let json_value = from_str("-12").unwrap();
3364 assert!(json_value.is_i64());
3366 let json_value = from_str("12").unwrap();
3367 assert!(!json_value.is_i64());
3369 let json_value = from_str("12.0").unwrap();
3370 assert!(!json_value.is_i64());
3375 let json_value = from_str("12").unwrap();
3376 assert!(json_value.is_u64());
3378 let json_value = from_str("-12").unwrap();
3379 assert!(!json_value.is_u64());
3381 let json_value = from_str("12.0").unwrap();
3382 assert!(!json_value.is_u64());
3387 let json_value = from_str("12").unwrap();
3388 assert!(!json_value.is_f64());
3390 let json_value = from_str("-12").unwrap();
3391 assert!(!json_value.is_f64());
3393 let json_value = from_str("12.0").unwrap();
3394 assert!(json_value.is_f64());
3396 let json_value = from_str("-12.0").unwrap();
3397 assert!(json_value.is_f64());
3402 let json_value = from_str("-12").unwrap();
3403 let json_num = json_value.as_i64();
3404 assert_eq!(json_num, Some(-12));
3409 let json_value = from_str("12").unwrap();
3410 let json_num = json_value.as_u64();
3411 assert_eq!(json_num, Some(12));
3416 let json_value = from_str("12.0").unwrap();
3417 let json_num = json_value.as_f64();
3418 assert_eq!(json_num, Some(12f64));
3422 fn test_is_boolean(){
3423 let json_value = from_str("false").unwrap();
3424 assert!(json_value.is_boolean());
3428 fn test_as_boolean(){
3429 let json_value = from_str("false").unwrap();
3430 let json_bool = json_value.as_boolean();
3431 let expected_bool = false;
3432 assert!(json_bool.is_some() && json_bool.unwrap() == expected_bool);
3437 let json_value = from_str("null").unwrap();
3438 assert!(json_value.is_null());
3443 let json_value = from_str("null").unwrap();
3444 let json_null = json_value.as_null();
3445 let expected_null = ();
3446 assert!(json_null.is_some() && json_null.unwrap() == expected_null);
3450 fn test_encode_hashmap_with_numeric_key() {
3451 use std::str::from_utf8;
3452 use std::collections::HashMap;
3453 let mut hm: HashMap<usize, bool> = HashMap::new();
3455 let mut mem_buf = Vec::new();
3456 write!(&mut mem_buf, "{}", super::as_pretty_json(&hm)).unwrap();
3457 let json_str = from_utf8(&mem_buf[..]).unwrap();
3458 match from_str(json_str) {
3459 Err(_) => panic!("Unable to parse json_str: {:?}", json_str),
3460 _ => {} // it parsed and we are good to go
3465 fn test_prettyencode_hashmap_with_numeric_key() {
3466 use std::str::from_utf8;
3467 use std::collections::HashMap;
3468 let mut hm: HashMap<usize, bool> = HashMap::new();
3470 let mut mem_buf = Vec::new();
3471 write!(&mut mem_buf, "{}", super::as_pretty_json(&hm)).unwrap();
3472 let json_str = from_utf8(&mem_buf[..]).unwrap();
3473 match from_str(json_str) {
3474 Err(_) => panic!("Unable to parse json_str: {:?}", json_str),
3475 _ => {} // it parsed and we are good to go
3480 fn test_prettyencoder_indent_level_param() {
3481 use std::str::from_utf8;
3482 use std::collections::BTreeMap;
3484 let mut tree = BTreeMap::new();
3486 tree.insert("hello".to_string(), String("guten tag".to_string()));
3487 tree.insert("goodbye".to_string(), String("sayonara".to_string()));
3490 // The following layout below should look a lot like
3491 // the pretty-printed JSON (indent * x)
3494 String("greetings".to_string()), // 1x
3495 Object(tree), // 1x + 2x + 2x + 1x
3497 // End JSON array (7 lines)
3500 // Helper function for counting indents
3501 fn indents(source: &str) -> usize {
3502 let trimmed = source.trim_left_matches(' ');
3503 source.len() - trimmed.len()
3506 // Test up to 4 spaces of indents (more?)
3508 let mut writer = Vec::new();
3509 write!(&mut writer, "{}",
3510 super::as_pretty_json(&json).indent(i)).unwrap();
3512 let printed = from_utf8(&writer[..]).unwrap();
3514 // Check for indents at each line
3515 let lines: Vec<&str> = printed.lines().collect();
3516 assert_eq!(lines.len(), 7); // JSON should be 7 lines
3518 assert_eq!(indents(lines[0]), 0 * i); // [
3519 assert_eq!(indents(lines[1]), 1 * i); // "greetings",
3520 assert_eq!(indents(lines[2]), 1 * i); // {
3521 assert_eq!(indents(lines[3]), 2 * i); // "hello": "guten tag",
3522 assert_eq!(indents(lines[4]), 2 * i); // "goodbye": "sayonara"
3523 assert_eq!(indents(lines[5]), 1 * i); // },
3524 assert_eq!(indents(lines[6]), 0 * i); // ]
3526 // Finally, test that the pretty-printed JSON is valid
3527 from_str(printed).ok().expect("Pretty-printed JSON is invalid!");
3532 fn test_hashmap_with_enum_key() {
3533 use std::collections::HashMap;
3535 #[derive(RustcEncodable, Eq, Hash, PartialEq, RustcDecodable, Debug)]
3541 let mut map = HashMap::new();
3542 map.insert(Enum::Foo, 0);
3543 let result = json::encode(&map).unwrap();
3544 assert_eq!(&result[..], r#"{"Foo":0}"#);
3545 let decoded: HashMap<Enum, _> = json::decode(&result).unwrap();
3546 assert_eq!(map, decoded);
3550 fn test_hashmap_with_numeric_key_can_handle_double_quote_delimited_key() {
3551 use std::collections::HashMap;
3553 let json_str = "{\"1\":true}";
3554 let json_obj = match from_str(json_str) {
3555 Err(_) => panic!("Unable to parse json_str: {:?}", json_str),
3558 let mut decoder = Decoder::new(json_obj);
3559 let _hm: HashMap<usize, bool> = Decodable::decode(&mut decoder).unwrap();
3563 fn test_hashmap_with_numeric_key_will_error_with_string_keys() {
3564 use std::collections::HashMap;
3566 let json_str = "{\"a\":true}";
3567 let json_obj = match from_str(json_str) {
3568 Err(_) => panic!("Unable to parse json_str: {:?}", json_str),
3571 let mut decoder = Decoder::new(json_obj);
3572 let result: Result<HashMap<usize, bool>, DecoderError> = Decodable::decode(&mut decoder);
3573 assert_eq!(result, Err(ExpectedError("Number".to_string(), "a".to_string())));
3576 fn assert_stream_equal(src: &str,
3577 expected: Vec<(JsonEvent, Vec<StackElement>)>) {
3578 let mut parser = Parser::new(src.chars());
3581 let evt = match parser.next() {
3585 let (ref expected_evt, ref expected_stack) = expected[i];
3586 if !parser.stack().is_equal_to(expected_stack) {
3587 panic!("Parser stack is not equal to {:?}", expected_stack);
3589 assert_eq!(&evt, expected_evt);
3594 fn test_streaming_parser() {
3595 assert_stream_equal(
3596 r#"{ "foo":"bar", "array" : [0, 1, 2, 3, 4, 5], "idents":[null,true,false]}"#,
3598 (ObjectStart, vec![]),
3599 (StringValue("bar".to_string()), vec![StackElement::Key("foo")]),
3600 (ArrayStart, vec![StackElement::Key("array")]),
3601 (U64Value(0), vec![StackElement::Key("array"), StackElement::Index(0)]),
3602 (U64Value(1), vec![StackElement::Key("array"), StackElement::Index(1)]),
3603 (U64Value(2), vec![StackElement::Key("array"), StackElement::Index(2)]),
3604 (U64Value(3), vec![StackElement::Key("array"), StackElement::Index(3)]),
3605 (U64Value(4), vec![StackElement::Key("array"), StackElement::Index(4)]),
3606 (U64Value(5), vec![StackElement::Key("array"), StackElement::Index(5)]),
3607 (ArrayEnd, vec![StackElement::Key("array")]),
3608 (ArrayStart, vec![StackElement::Key("idents")]),
3609 (NullValue, vec![StackElement::Key("idents"),
3610 StackElement::Index(0)]),
3611 (BooleanValue(true), vec![StackElement::Key("idents"),
3612 StackElement::Index(1)]),
3613 (BooleanValue(false), vec![StackElement::Key("idents"),
3614 StackElement::Index(2)]),
3615 (ArrayEnd, vec![StackElement::Key("idents")]),
3616 (ObjectEnd, vec![]),
3620 fn last_event(src: &str) -> JsonEvent {
3621 let mut parser = Parser::new(src.chars());
3622 let mut evt = NullValue;
3624 evt = match parser.next() {
3632 fn test_read_object_streaming() {
3633 assert_eq!(last_event("{ "), Error(SyntaxError(EOFWhileParsingObject, 1, 3)));
3634 assert_eq!(last_event("{1"), Error(SyntaxError(KeyMustBeAString, 1, 2)));
3635 assert_eq!(last_event("{ \"a\""), Error(SyntaxError(EOFWhileParsingObject, 1, 6)));
3636 assert_eq!(last_event("{\"a\""), Error(SyntaxError(EOFWhileParsingObject, 1, 5)));
3637 assert_eq!(last_event("{\"a\" "), Error(SyntaxError(EOFWhileParsingObject, 1, 6)));
3639 assert_eq!(last_event("{\"a\" 1"), Error(SyntaxError(ExpectedColon, 1, 6)));
3640 assert_eq!(last_event("{\"a\":"), Error(SyntaxError(EOFWhileParsingValue, 1, 6)));
3641 assert_eq!(last_event("{\"a\":1"), Error(SyntaxError(EOFWhileParsingObject, 1, 7)));
3642 assert_eq!(last_event("{\"a\":1 1"), Error(SyntaxError(InvalidSyntax, 1, 8)));
3643 assert_eq!(last_event("{\"a\":1,"), Error(SyntaxError(EOFWhileParsingObject, 1, 8)));
3644 assert_eq!(last_event("{\"a\":1,}"), Error(SyntaxError(TrailingComma, 1, 8)));
3646 assert_stream_equal(
3648 vec![(ObjectStart, vec![]), (ObjectEnd, vec![])]
3650 assert_stream_equal(
3653 (ObjectStart, vec![]),
3654 (U64Value(3), vec![StackElement::Key("a")]),
3655 (ObjectEnd, vec![]),
3658 assert_stream_equal(
3659 "{ \"a\": null, \"b\" : true }",
3661 (ObjectStart, vec![]),
3662 (NullValue, vec![StackElement::Key("a")]),
3663 (BooleanValue(true), vec![StackElement::Key("b")]),
3664 (ObjectEnd, vec![]),
3667 assert_stream_equal(
3668 "{\"a\" : 1.0 ,\"b\": [ true ]}",
3670 (ObjectStart, vec![]),
3671 (F64Value(1.0), vec![StackElement::Key("a")]),
3672 (ArrayStart, vec![StackElement::Key("b")]),
3673 (BooleanValue(true),vec![StackElement::Key("b"), StackElement::Index(0)]),
3674 (ArrayEnd, vec![StackElement::Key("b")]),
3675 (ObjectEnd, vec![]),
3678 assert_stream_equal(
3684 { "c": {"d": null} }
3688 (ObjectStart, vec![]),
3689 (F64Value(1.0), vec![StackElement::Key("a")]),
3690 (ArrayStart, vec![StackElement::Key("b")]),
3691 (BooleanValue(true), vec![StackElement::Key("b"),
3692 StackElement::Index(0)]),
3693 (StringValue("foo\nbar".to_string()), vec![StackElement::Key("b"),
3694 StackElement::Index(1)]),
3695 (ObjectStart, vec![StackElement::Key("b"),
3696 StackElement::Index(2)]),
3697 (ObjectStart, vec![StackElement::Key("b"),
3698 StackElement::Index(2),
3699 StackElement::Key("c")]),
3700 (NullValue, vec![StackElement::Key("b"),
3701 StackElement::Index(2),
3702 StackElement::Key("c"),
3703 StackElement::Key("d")]),
3704 (ObjectEnd, vec![StackElement::Key("b"),
3705 StackElement::Index(2),
3706 StackElement::Key("c")]),
3707 (ObjectEnd, vec![StackElement::Key("b"),
3708 StackElement::Index(2)]),
3709 (ArrayEnd, vec![StackElement::Key("b")]),
3710 (ObjectEnd, vec![]),
3715 fn test_read_array_streaming() {
3716 assert_stream_equal(
3719 (ArrayStart, vec![]),
3723 assert_stream_equal(
3726 (ArrayStart, vec![]),
3730 assert_stream_equal(
3733 (ArrayStart, vec![]),
3734 (BooleanValue(true), vec![StackElement::Index(0)]),
3738 assert_stream_equal(
3741 (ArrayStart, vec![]),
3742 (BooleanValue(false), vec![StackElement::Index(0)]),
3746 assert_stream_equal(
3749 (ArrayStart, vec![]),
3750 (NullValue, vec![StackElement::Index(0)]),
3754 assert_stream_equal(
3757 (ArrayStart, vec![]),
3758 (U64Value(3), vec![StackElement::Index(0)]),
3759 (U64Value(1), vec![StackElement::Index(1)]),
3763 assert_stream_equal(
3766 (ArrayStart, vec![]),
3767 (U64Value(3), vec![StackElement::Index(0)]),
3768 (U64Value(2), vec![StackElement::Index(1)]),
3772 assert_stream_equal(
3775 (ArrayStart, vec![]),
3776 (U64Value(2), vec![StackElement::Index(0)]),
3777 (ArrayStart, vec![StackElement::Index(1)]),
3778 (U64Value(4), vec![StackElement::Index(1), StackElement::Index(0)]),
3779 (U64Value(1), vec![StackElement::Index(1), StackElement::Index(1)]),
3780 (ArrayEnd, vec![StackElement::Index(1)]),
3785 assert_eq!(last_event("["), Error(SyntaxError(EOFWhileParsingValue, 1, 2)));
3787 assert_eq!(from_str("["), Err(SyntaxError(EOFWhileParsingValue, 1, 2)));
3788 assert_eq!(from_str("[1"), Err(SyntaxError(EOFWhileParsingArray, 1, 3)));
3789 assert_eq!(from_str("[1,"), Err(SyntaxError(EOFWhileParsingValue, 1, 4)));
3790 assert_eq!(from_str("[1,]"), Err(SyntaxError(InvalidSyntax, 1, 4)));
3791 assert_eq!(from_str("[6 7]"), Err(SyntaxError(InvalidSyntax, 1, 4)));
3795 fn test_trailing_characters_streaming() {
3796 assert_eq!(last_event("nulla"), Error(SyntaxError(TrailingCharacters, 1, 5)));
3797 assert_eq!(last_event("truea"), Error(SyntaxError(TrailingCharacters, 1, 5)));
3798 assert_eq!(last_event("falsea"), Error(SyntaxError(TrailingCharacters, 1, 6)));
3799 assert_eq!(last_event("1a"), Error(SyntaxError(TrailingCharacters, 1, 2)));
3800 assert_eq!(last_event("[]a"), Error(SyntaxError(TrailingCharacters, 1, 3)));
3801 assert_eq!(last_event("{}a"), Error(SyntaxError(TrailingCharacters, 1, 3)));
3804 fn test_read_identifiers_streaming() {
3805 assert_eq!(Parser::new("null".chars()).next(), Some(NullValue));
3806 assert_eq!(Parser::new("true".chars()).next(), Some(BooleanValue(true)));
3807 assert_eq!(Parser::new("false".chars()).next(), Some(BooleanValue(false)));
3809 assert_eq!(last_event("n"), Error(SyntaxError(InvalidSyntax, 1, 2)));
3810 assert_eq!(last_event("nul"), Error(SyntaxError(InvalidSyntax, 1, 4)));
3811 assert_eq!(last_event("t"), Error(SyntaxError(InvalidSyntax, 1, 2)));
3812 assert_eq!(last_event("truz"), Error(SyntaxError(InvalidSyntax, 1, 4)));
3813 assert_eq!(last_event("f"), Error(SyntaxError(InvalidSyntax, 1, 2)));
3814 assert_eq!(last_event("faz"), Error(SyntaxError(InvalidSyntax, 1, 3)));
3819 let mut stack = Stack::new();
3821 assert!(stack.is_empty());
3822 assert!(stack.is_empty());
3823 assert!(!stack.last_is_index());
3825 stack.push_index(0);
3828 assert!(stack.len() == 1);
3829 assert!(stack.is_equal_to(&[StackElement::Index(1)]));
3830 assert!(stack.starts_with(&[StackElement::Index(1)]));
3831 assert!(stack.ends_with(&[StackElement::Index(1)]));
3832 assert!(stack.last_is_index());
3833 assert!(stack.get(0) == StackElement::Index(1));
3835 stack.push_key("foo".to_string());
3837 assert!(stack.len() == 2);
3838 assert!(stack.is_equal_to(&[StackElement::Index(1), StackElement::Key("foo")]));
3839 assert!(stack.starts_with(&[StackElement::Index(1), StackElement::Key("foo")]));
3840 assert!(stack.starts_with(&[StackElement::Index(1)]));
3841 assert!(stack.ends_with(&[StackElement::Index(1), StackElement::Key("foo")]));
3842 assert!(stack.ends_with(&[StackElement::Key("foo")]));
3843 assert!(!stack.last_is_index());
3844 assert!(stack.get(0) == StackElement::Index(1));
3845 assert!(stack.get(1) == StackElement::Key("foo"));
3847 stack.push_key("bar".to_string());
3849 assert!(stack.len() == 3);
3850 assert!(stack.is_equal_to(&[StackElement::Index(1),
3851 StackElement::Key("foo"),
3852 StackElement::Key("bar")]));
3853 assert!(stack.starts_with(&[StackElement::Index(1)]));
3854 assert!(stack.starts_with(&[StackElement::Index(1), StackElement::Key("foo")]));
3855 assert!(stack.starts_with(&[StackElement::Index(1),
3856 StackElement::Key("foo"),
3857 StackElement::Key("bar")]));
3858 assert!(stack.ends_with(&[StackElement::Key("bar")]));
3859 assert!(stack.ends_with(&[StackElement::Key("foo"), StackElement::Key("bar")]));
3860 assert!(stack.ends_with(&[StackElement::Index(1),
3861 StackElement::Key("foo"),
3862 StackElement::Key("bar")]));
3863 assert!(!stack.last_is_index());
3864 assert!(stack.get(0) == StackElement::Index(1));
3865 assert!(stack.get(1) == StackElement::Key("foo"));
3866 assert!(stack.get(2) == StackElement::Key("bar"));
3870 assert!(stack.len() == 2);
3871 assert!(stack.is_equal_to(&[StackElement::Index(1), StackElement::Key("foo")]));
3872 assert!(stack.starts_with(&[StackElement::Index(1), StackElement::Key("foo")]));
3873 assert!(stack.starts_with(&[StackElement::Index(1)]));
3874 assert!(stack.ends_with(&[StackElement::Index(1), StackElement::Key("foo")]));
3875 assert!(stack.ends_with(&[StackElement::Key("foo")]));
3876 assert!(!stack.last_is_index());
3877 assert!(stack.get(0) == StackElement::Index(1));
3878 assert!(stack.get(1) == StackElement::Key("foo"));
3883 use std::collections::{HashMap,BTreeMap};
3886 let array2 = Array(vec![U64(1), U64(2)]);
3887 let array3 = Array(vec![U64(1), U64(2), U64(3)]);
3889 let mut tree_map = BTreeMap::new();
3890 tree_map.insert("a".to_string(), U64(1));
3891 tree_map.insert("b".to_string(), U64(2));
3895 assert_eq!(array2.to_json(), array2);
3896 assert_eq!(object.to_json(), object);
3897 assert_eq!(3_isize.to_json(), I64(3));
3898 assert_eq!(4_i8.to_json(), I64(4));
3899 assert_eq!(5_i16.to_json(), I64(5));
3900 assert_eq!(6_i32.to_json(), I64(6));
3901 assert_eq!(7_i64.to_json(), I64(7));
3902 assert_eq!(8_usize.to_json(), U64(8));
3903 assert_eq!(9_u8.to_json(), U64(9));
3904 assert_eq!(10_u16.to_json(), U64(10));
3905 assert_eq!(11_u32.to_json(), U64(11));
3906 assert_eq!(12_u64.to_json(), U64(12));
3907 assert_eq!(13.0_f32.to_json(), F64(13.0_f64));
3908 assert_eq!(14.0_f64.to_json(), F64(14.0_f64));
3909 assert_eq!(().to_json(), Null);
3910 assert_eq!(f32::INFINITY.to_json(), Null);
3911 assert_eq!(f64::NAN.to_json(), Null);
3912 assert_eq!(true.to_json(), Boolean(true));
3913 assert_eq!(false.to_json(), Boolean(false));
3914 assert_eq!("abc".to_json(), String("abc".to_string()));
3915 assert_eq!("abc".to_string().to_json(), String("abc".to_string()));
3916 assert_eq!((1_usize, 2_usize).to_json(), array2);
3917 assert_eq!((1_usize, 2_usize, 3_usize).to_json(), array3);
3918 assert_eq!([1_usize, 2_usize].to_json(), array2);
3919 assert_eq!((&[1_usize, 2_usize, 3_usize]).to_json(), array3);
3920 assert_eq!((vec![1_usize, 2_usize]).to_json(), array2);
3921 assert_eq!(vec![1_usize, 2_usize, 3_usize].to_json(), array3);
3922 let mut tree_map = BTreeMap::new();
3923 tree_map.insert("a".to_string(), 1 as usize);
3924 tree_map.insert("b".to_string(), 2);
3925 assert_eq!(tree_map.to_json(), object);
3926 let mut hash_map = HashMap::new();
3927 hash_map.insert("a".to_string(), 1 as usize);
3928 hash_map.insert("b".to_string(), 2);
3929 assert_eq!(hash_map.to_json(), object);
3930 assert_eq!(Some(15).to_json(), I64(15));
3931 assert_eq!(Some(15 as usize).to_json(), U64(15));
3932 assert_eq!(None::<isize>.to_json(), Null);
3936 fn test_encode_hashmap_with_arbitrary_key() {
3937 use std::collections::HashMap;
3938 #[derive(PartialEq, Eq, Hash, RustcEncodable)]
3939 struct ArbitraryType(usize);
3940 let mut hm: HashMap<ArbitraryType, bool> = HashMap::new();
3941 hm.insert(ArbitraryType(1), true);
3942 let mut mem_buf = string::String::new();
3943 let mut encoder = Encoder::new(&mut mem_buf);
3944 let result = hm.encode(&mut encoder);
3945 match result.unwrap_err() {
3946 EncoderError::BadHashmapKey => (),
3947 _ => panic!("expected bad hash map key")
3952 fn bench_streaming_small(b: &mut Bencher) {
3954 let mut parser = Parser::new(
3960 { "c": {"d": null} }
3965 match parser.next() {
3973 fn bench_small(b: &mut Bencher) {
3975 let _ = from_str(r#"{
3980 { "c": {"d": null} }
3986 fn big_json() -> string::String {
3987 let mut src = "[\n".to_string();
3989 src.push_str(r#"{ "a": true, "b": null, "c":3.1415, "d": "Hello world", "e": \
3992 src.push_str("{}]");
3997 fn bench_streaming_large(b: &mut Bencher) {
3998 let src = big_json();
4000 let mut parser = Parser::new(src.chars());
4002 match parser.next() {
4010 fn bench_large(b: &mut Bencher) {
4011 let src = big_json();
4012 b.iter( || { let _ = from_str(&src); });