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::collections::{HashMap, BTreeMap};
203 use std::io::prelude::*;
206 use std::num::FpCategory as Fp;
208 use std::str::FromStr;
210 use std::{char, f64, fmt, str};
215 /// Represents a json value
216 #[derive(Clone, PartialEq, PartialOrd, Debug)]
221 String(string::String),
224 Object(self::Object),
228 pub type Array = Vec<Json>;
229 pub type Object = BTreeMap<string::String, Json>;
231 pub struct PrettyJson<'a> { inner: &'a Json }
233 pub struct AsJson<'a, T: 'a> { inner: &'a T }
234 pub struct AsPrettyJson<'a, T: 'a> { inner: &'a T, indent: Option<usize> }
236 /// The errors that can arise while parsing a JSON stream.
237 #[derive(Clone, Copy, PartialEq, Debug)]
241 EOFWhileParsingObject,
242 EOFWhileParsingArray,
243 EOFWhileParsingValue,
244 EOFWhileParsingString,
250 InvalidUnicodeCodePoint,
251 LoneLeadingSurrogateInHexEscape,
252 UnexpectedEndOfHexEscape,
258 #[derive(Clone, PartialEq, Debug)]
259 pub enum ParserError {
261 SyntaxError(ErrorCode, usize, usize),
262 IoError(io::ErrorKind, String),
265 // Builder and Parser have the same errors.
266 pub type BuilderError = ParserError;
268 #[derive(Clone, PartialEq, Debug)]
269 pub enum DecoderError {
270 ParseError(ParserError),
271 ExpectedError(string::String, string::String),
272 MissingFieldError(string::String),
273 UnknownVariantError(string::String),
274 ApplicationError(string::String)
277 #[derive(Copy, Clone, Debug)]
278 pub enum EncoderError {
279 FmtError(fmt::Error),
283 /// Returns a readable error string for a given error code.
284 pub fn error_str(error: ErrorCode) -> &'static str {
286 InvalidSyntax => "invalid syntax",
287 InvalidNumber => "invalid number",
288 EOFWhileParsingObject => "EOF While parsing object",
289 EOFWhileParsingArray => "EOF While parsing array",
290 EOFWhileParsingValue => "EOF While parsing value",
291 EOFWhileParsingString => "EOF While parsing string",
292 KeyMustBeAString => "key must be a string",
293 ExpectedColon => "expected `:`",
294 TrailingCharacters => "trailing characters",
295 TrailingComma => "trailing comma",
296 InvalidEscape => "invalid escape",
297 UnrecognizedHex => "invalid \\u{ esc}ape (unrecognized hex)",
298 NotFourDigit => "invalid \\u{ esc}ape (not four digits)",
299 NotUtf8 => "contents not utf-8",
300 InvalidUnicodeCodePoint => "invalid Unicode code point",
301 LoneLeadingSurrogateInHexEscape => "lone leading surrogate in hex escape",
302 UnexpectedEndOfHexEscape => "unexpected end of hex escape",
306 /// Shortcut function to decode a JSON `&str` into an object
307 pub fn decode<T: ::Decodable>(s: &str) -> DecodeResult<T> {
308 let json = match from_str(s) {
310 Err(e) => return Err(ParseError(e))
313 let mut decoder = Decoder::new(json);
314 ::Decodable::decode(&mut decoder)
317 /// Shortcut function to encode a `T` into a JSON `String`
318 pub fn encode<T: ::Encodable>(object: &T) -> Result<string::String, EncoderError> {
319 let mut s = String::new();
321 let mut encoder = Encoder::new(&mut s);
322 try!(object.encode(&mut encoder));
327 impl fmt::Display for ErrorCode {
328 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
329 error_str(*self).fmt(f)
333 fn io_error_to_error(io: io::Error) -> ParserError {
334 IoError(io.kind(), io.to_string())
337 impl fmt::Display for ParserError {
338 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
339 // FIXME this should be a nicer error
340 fmt::Debug::fmt(self, f)
344 impl fmt::Display for DecoderError {
345 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
346 // FIXME this should be a nicer error
347 fmt::Debug::fmt(self, f)
351 impl std::error::Error for DecoderError {
352 fn description(&self) -> &str { "decoder error" }
355 impl fmt::Display for EncoderError {
356 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
357 // FIXME this should be a nicer error
358 fmt::Debug::fmt(self, f)
362 impl std::error::Error for EncoderError {
363 fn description(&self) -> &str { "encoder error" }
366 impl From<fmt::Error> for EncoderError {
367 fn from(err: fmt::Error) -> EncoderError { EncoderError::FmtError(err) }
370 pub type EncodeResult = Result<(), EncoderError>;
371 pub type DecodeResult<T> = Result<T, DecoderError>;
373 fn escape_str(wr: &mut fmt::Write, v: &str) -> EncodeResult {
374 try!(wr.write_str("\""));
378 for (i, byte) in v.bytes().enumerate() {
379 let escaped = match byte {
382 b'\x00' => "\\u0000",
383 b'\x01' => "\\u0001",
384 b'\x02' => "\\u0002",
385 b'\x03' => "\\u0003",
386 b'\x04' => "\\u0004",
387 b'\x05' => "\\u0005",
388 b'\x06' => "\\u0006",
389 b'\x07' => "\\u0007",
393 b'\x0b' => "\\u000b",
396 b'\x0e' => "\\u000e",
397 b'\x0f' => "\\u000f",
398 b'\x10' => "\\u0010",
399 b'\x11' => "\\u0011",
400 b'\x12' => "\\u0012",
401 b'\x13' => "\\u0013",
402 b'\x14' => "\\u0014",
403 b'\x15' => "\\u0015",
404 b'\x16' => "\\u0016",
405 b'\x17' => "\\u0017",
406 b'\x18' => "\\u0018",
407 b'\x19' => "\\u0019",
408 b'\x1a' => "\\u001a",
409 b'\x1b' => "\\u001b",
410 b'\x1c' => "\\u001c",
411 b'\x1d' => "\\u001d",
412 b'\x1e' => "\\u001e",
413 b'\x1f' => "\\u001f",
414 b'\x7f' => "\\u007f",
419 try!(wr.write_str(&v[start..i]));
422 try!(wr.write_str(escaped));
427 if start != v.len() {
428 try!(wr.write_str(&v[start..]));
431 try!(wr.write_str("\""));
435 fn escape_char(writer: &mut fmt::Write, v: char) -> EncodeResult {
436 let mut buf = [0; 4];
437 let n = v.encode_utf8(&mut buf).unwrap();
438 let buf = unsafe { str::from_utf8_unchecked(&buf[..n]) };
439 escape_str(writer, buf)
442 fn spaces(wr: &mut fmt::Write, mut n: usize) -> EncodeResult {
443 const BUF: &'static str = " ";
445 while n >= BUF.len() {
446 try!(wr.write_str(BUF));
451 try!(wr.write_str(&BUF[..n]));
456 fn fmt_number_or_null(v: f64) -> string::String {
458 Fp::Nan | Fp::Infinite => string::String::from("null"),
459 _ if v.fract() != 0f64 => v.to_string(),
460 _ => v.to_string() + ".0",
464 /// A structure for implementing serialization to JSON.
465 pub struct Encoder<'a> {
466 writer: &'a mut (fmt::Write+'a),
467 is_emitting_map_key: bool,
470 impl<'a> Encoder<'a> {
471 /// Creates a new JSON encoder whose output will be written to the writer
473 pub fn new(writer: &'a mut fmt::Write) -> Encoder<'a> {
474 Encoder { writer: writer, is_emitting_map_key: false, }
478 macro_rules! emit_enquoted_if_mapkey {
479 ($enc:ident,$e:expr) => {
480 if $enc.is_emitting_map_key {
481 try!(write!($enc.writer, "\"{}\"", $e));
484 try!(write!($enc.writer, "{}", $e));
490 impl<'a> ::Encoder for Encoder<'a> {
491 type Error = EncoderError;
493 fn emit_nil(&mut self) -> EncodeResult {
494 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
495 try!(write!(self.writer, "null"));
499 fn emit_uint(&mut self, v: usize) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
500 fn emit_u64(&mut self, v: u64) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
501 fn emit_u32(&mut self, v: u32) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
502 fn emit_u16(&mut self, v: u16) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
503 fn emit_u8(&mut self, v: u8) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
505 fn emit_int(&mut self, v: isize) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
506 fn emit_i64(&mut self, v: i64) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
507 fn emit_i32(&mut self, v: i32) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
508 fn emit_i16(&mut self, v: i16) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
509 fn emit_i8(&mut self, v: i8) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
511 fn emit_bool(&mut self, v: bool) -> EncodeResult {
512 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
514 try!(write!(self.writer, "true"));
516 try!(write!(self.writer, "false"));
521 fn emit_f64(&mut self, v: f64) -> EncodeResult {
522 emit_enquoted_if_mapkey!(self, fmt_number_or_null(v))
524 fn emit_f32(&mut self, v: f32) -> EncodeResult {
525 self.emit_f64(v as f64)
528 fn emit_char(&mut self, v: char) -> EncodeResult {
529 escape_char(self.writer, v)
531 fn emit_str(&mut self, v: &str) -> EncodeResult {
532 escape_str(self.writer, v)
535 fn emit_enum<F>(&mut self, _name: &str, f: F) -> EncodeResult where
536 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
541 fn emit_enum_variant<F>(&mut self,
545 f: F) -> EncodeResult where
546 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
548 // enums are encoded as strings or objects
550 // Kangaroo(34,"William") => {"variant": "Kangaroo", "fields": [34,"William"]}
552 escape_str(self.writer, name)
554 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
555 try!(write!(self.writer, "{{\"variant\":"));
556 try!(escape_str(self.writer, name));
557 try!(write!(self.writer, ",\"fields\":["));
559 try!(write!(self.writer, "]}}"));
564 fn emit_enum_variant_arg<F>(&mut self, idx: usize, f: F) -> EncodeResult where
565 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
567 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
569 try!(write!(self.writer, ","));
574 fn emit_enum_struct_variant<F>(&mut self,
578 f: F) -> EncodeResult where
579 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
581 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
582 self.emit_enum_variant(name, id, cnt, f)
585 fn emit_enum_struct_variant_field<F>(&mut self,
588 f: F) -> EncodeResult where
589 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
591 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
592 self.emit_enum_variant_arg(idx, f)
595 fn emit_struct<F>(&mut self, _: &str, _: usize, f: F) -> EncodeResult where
596 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
598 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
599 try!(write!(self.writer, "{{"));
601 try!(write!(self.writer, "}}"));
605 fn emit_struct_field<F>(&mut self, name: &str, idx: usize, f: F) -> EncodeResult where
606 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
608 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
609 if idx != 0 { try!(write!(self.writer, ",")); }
610 try!(escape_str(self.writer, name));
611 try!(write!(self.writer, ":"));
615 fn emit_tuple<F>(&mut self, len: usize, f: F) -> EncodeResult where
616 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
618 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
619 self.emit_seq(len, f)
621 fn emit_tuple_arg<F>(&mut self, idx: usize, f: F) -> EncodeResult where
622 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
624 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
625 self.emit_seq_elt(idx, f)
628 fn emit_tuple_struct<F>(&mut self, _name: &str, len: usize, f: F) -> EncodeResult where
629 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
631 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
632 self.emit_seq(len, f)
634 fn emit_tuple_struct_arg<F>(&mut self, idx: usize, f: F) -> EncodeResult where
635 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
637 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
638 self.emit_seq_elt(idx, f)
641 fn emit_option<F>(&mut self, f: F) -> EncodeResult where
642 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
644 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
647 fn emit_option_none(&mut self) -> EncodeResult {
648 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
651 fn emit_option_some<F>(&mut self, f: F) -> EncodeResult where
652 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
654 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
658 fn emit_seq<F>(&mut self, _len: usize, f: F) -> EncodeResult where
659 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
661 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
662 try!(write!(self.writer, "["));
664 try!(write!(self.writer, "]"));
668 fn emit_seq_elt<F>(&mut self, idx: usize, f: F) -> EncodeResult where
669 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
671 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
673 try!(write!(self.writer, ","));
678 fn emit_map<F>(&mut self, _len: usize, f: F) -> EncodeResult where
679 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
681 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
682 try!(write!(self.writer, "{{"));
684 try!(write!(self.writer, "}}"));
688 fn emit_map_elt_key<F>(&mut self, idx: usize, f: F) -> EncodeResult where
689 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
691 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
692 if idx != 0 { try!(write!(self.writer, ",")) }
693 self.is_emitting_map_key = true;
695 self.is_emitting_map_key = false;
699 fn emit_map_elt_val<F>(&mut self, _idx: usize, f: F) -> EncodeResult where
700 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
702 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
703 try!(write!(self.writer, ":"));
708 /// Another encoder for JSON, but prints out human-readable JSON instead of
710 pub struct PrettyEncoder<'a> {
711 writer: &'a mut (fmt::Write+'a),
714 is_emitting_map_key: bool,
717 impl<'a> PrettyEncoder<'a> {
718 /// Creates a new encoder whose output will be written to the specified writer
719 pub fn new(writer: &'a mut fmt::Write) -> PrettyEncoder<'a> {
724 is_emitting_map_key: false,
728 /// Set the number of spaces to indent for each level.
729 /// This is safe to set during encoding.
730 pub fn set_indent(&mut self, indent: usize) {
731 // self.indent very well could be 0 so we need to use checked division.
732 let level = self.curr_indent.checked_div(self.indent).unwrap_or(0);
733 self.indent = indent;
734 self.curr_indent = level * self.indent;
738 impl<'a> ::Encoder for PrettyEncoder<'a> {
739 type Error = EncoderError;
741 fn emit_nil(&mut self) -> EncodeResult {
742 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
743 try!(write!(self.writer, "null"));
747 fn emit_uint(&mut self, v: usize) -> 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_int(&mut self, v: isize) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
754 fn emit_i64(&mut self, v: i64) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
755 fn emit_i32(&mut self, v: i32) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
756 fn emit_i16(&mut self, v: i16) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
757 fn emit_i8(&mut self, v: i8) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
759 fn emit_bool(&mut self, v: bool) -> EncodeResult {
760 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
762 try!(write!(self.writer, "true"));
764 try!(write!(self.writer, "false"));
769 fn emit_f64(&mut self, v: f64) -> EncodeResult {
770 emit_enquoted_if_mapkey!(self, fmt_number_or_null(v))
772 fn emit_f32(&mut self, v: f32) -> EncodeResult {
773 self.emit_f64(v as f64)
776 fn emit_char(&mut self, v: char) -> EncodeResult {
777 escape_char(self.writer, v)
779 fn emit_str(&mut self, v: &str) -> EncodeResult {
780 escape_str(self.writer, v)
783 fn emit_enum<F>(&mut self, _name: &str, f: F) -> EncodeResult where
784 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
789 fn emit_enum_variant<F>(&mut self,
794 -> EncodeResult where
795 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
798 escape_str(self.writer, name)
800 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
801 try!(write!(self.writer, "{{\n"));
802 self.curr_indent += self.indent;
803 try!(spaces(self.writer, self.curr_indent));
804 try!(write!(self.writer, "\"variant\": "));
805 try!(escape_str(self.writer, name));
806 try!(write!(self.writer, ",\n"));
807 try!(spaces(self.writer, self.curr_indent));
808 try!(write!(self.writer, "\"fields\": [\n"));
809 self.curr_indent += self.indent;
811 self.curr_indent -= self.indent;
812 try!(write!(self.writer, "\n"));
813 try!(spaces(self.writer, self.curr_indent));
814 self.curr_indent -= self.indent;
815 try!(write!(self.writer, "]\n"));
816 try!(spaces(self.writer, self.curr_indent));
817 try!(write!(self.writer, "}}"));
822 fn emit_enum_variant_arg<F>(&mut self, idx: usize, f: F) -> EncodeResult where
823 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
825 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
827 try!(write!(self.writer, ",\n"));
829 try!(spaces(self.writer, self.curr_indent));
833 fn emit_enum_struct_variant<F>(&mut self,
837 f: F) -> EncodeResult where
838 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
840 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
841 self.emit_enum_variant(name, id, cnt, f)
844 fn emit_enum_struct_variant_field<F>(&mut self,
847 f: F) -> EncodeResult where
848 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
850 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
851 self.emit_enum_variant_arg(idx, f)
855 fn emit_struct<F>(&mut self, _: &str, len: usize, f: F) -> EncodeResult where
856 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
858 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
860 try!(write!(self.writer, "{{}}"));
862 try!(write!(self.writer, "{{"));
863 self.curr_indent += self.indent;
865 self.curr_indent -= self.indent;
866 try!(write!(self.writer, "\n"));
867 try!(spaces(self.writer, self.curr_indent));
868 try!(write!(self.writer, "}}"));
873 fn emit_struct_field<F>(&mut self, name: &str, idx: usize, f: F) -> EncodeResult where
874 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
876 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
878 try!(write!(self.writer, "\n"));
880 try!(write!(self.writer, ",\n"));
882 try!(spaces(self.writer, self.curr_indent));
883 try!(escape_str(self.writer, name));
884 try!(write!(self.writer, ": "));
888 fn emit_tuple<F>(&mut self, len: usize, f: F) -> EncodeResult where
889 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
891 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
892 self.emit_seq(len, f)
894 fn emit_tuple_arg<F>(&mut self, idx: usize, f: F) -> EncodeResult where
895 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
897 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
898 self.emit_seq_elt(idx, f)
901 fn emit_tuple_struct<F>(&mut self, _: &str, len: usize, f: F) -> EncodeResult where
902 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
904 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
905 self.emit_seq(len, f)
907 fn emit_tuple_struct_arg<F>(&mut self, idx: usize, f: F) -> EncodeResult where
908 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
910 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
911 self.emit_seq_elt(idx, f)
914 fn emit_option<F>(&mut self, f: F) -> EncodeResult where
915 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
917 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
920 fn emit_option_none(&mut self) -> EncodeResult {
921 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
924 fn emit_option_some<F>(&mut self, f: F) -> EncodeResult where
925 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
927 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
931 fn emit_seq<F>(&mut self, len: usize, f: F) -> EncodeResult where
932 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
934 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
936 try!(write!(self.writer, "[]"));
938 try!(write!(self.writer, "["));
939 self.curr_indent += self.indent;
941 self.curr_indent -= self.indent;
942 try!(write!(self.writer, "\n"));
943 try!(spaces(self.writer, self.curr_indent));
944 try!(write!(self.writer, "]"));
949 fn emit_seq_elt<F>(&mut self, idx: usize, f: F) -> EncodeResult where
950 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
952 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
954 try!(write!(self.writer, "\n"));
956 try!(write!(self.writer, ",\n"));
958 try!(spaces(self.writer, self.curr_indent));
962 fn emit_map<F>(&mut self, len: usize, f: F) -> EncodeResult where
963 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
965 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
967 try!(write!(self.writer, "{{}}"));
969 try!(write!(self.writer, "{{"));
970 self.curr_indent += self.indent;
972 self.curr_indent -= self.indent;
973 try!(write!(self.writer, "\n"));
974 try!(spaces(self.writer, self.curr_indent));
975 try!(write!(self.writer, "}}"));
980 fn emit_map_elt_key<F>(&mut self, idx: usize, f: F) -> EncodeResult where
981 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
983 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
985 try!(write!(self.writer, "\n"));
987 try!(write!(self.writer, ",\n"));
989 try!(spaces(self.writer, self.curr_indent));
990 self.is_emitting_map_key = true;
992 self.is_emitting_map_key = false;
996 fn emit_map_elt_val<F>(&mut self, _idx: usize, f: F) -> EncodeResult where
997 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
999 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
1000 try!(write!(self.writer, ": "));
1005 impl Encodable for Json {
1006 fn encode<E: ::Encoder>(&self, e: &mut E) -> Result<(), E::Error> {
1008 Json::I64(v) => v.encode(e),
1009 Json::U64(v) => v.encode(e),
1010 Json::F64(v) => v.encode(e),
1011 Json::String(ref v) => v.encode(e),
1012 Json::Boolean(v) => v.encode(e),
1013 Json::Array(ref v) => v.encode(e),
1014 Json::Object(ref v) => v.encode(e),
1015 Json::Null => e.emit_nil(),
1020 /// Create an `AsJson` wrapper which can be used to print a value as JSON
1021 /// on-the-fly via `write!`
1022 pub fn as_json<T>(t: &T) -> AsJson<T> {
1026 /// Create an `AsPrettyJson` wrapper which can be used to print a value as JSON
1027 /// on-the-fly via `write!`
1028 pub fn as_pretty_json<T>(t: &T) -> AsPrettyJson<T> {
1029 AsPrettyJson { inner: t, indent: None }
1033 /// Borrow this json object as a pretty object to generate a pretty
1034 /// representation for it via `Display`.
1035 pub fn pretty(&self) -> PrettyJson {
1036 PrettyJson { inner: self }
1039 /// If the Json value is an Object, returns the value associated with the provided key.
1040 /// Otherwise, returns None.
1041 pub fn find<'a>(&'a self, key: &str) -> Option<&'a Json>{
1043 Json::Object(ref map) => map.get(key),
1048 /// Attempts to get a nested Json Object for each key in `keys`.
1049 /// If any key is found not to exist, find_path will return None.
1050 /// Otherwise, it will return the Json value associated with the final key.
1051 pub fn find_path<'a>(&'a self, keys: &[&str]) -> Option<&'a Json>{
1052 let mut target = self;
1054 match target.find(*key) {
1055 Some(t) => { target = t; },
1062 /// If the Json value is an Object, performs a depth-first search until
1063 /// a value associated with the provided key is found. If no value is found
1064 /// or the Json value is not an Object, returns None.
1065 pub fn search<'a>(&'a self, key: &str) -> Option<&'a Json> {
1067 &Json::Object(ref map) => {
1068 match map.get(key) {
1069 Some(json_value) => Some(json_value),
1072 match v.search(key) {
1073 x if x.is_some() => return x,
1085 /// Returns true if the Json value is an Object. Returns false otherwise.
1086 pub fn is_object(&self) -> bool {
1087 self.as_object().is_some()
1090 /// If the Json value is an Object, returns the associated BTreeMap.
1091 /// Returns None otherwise.
1092 pub fn as_object(&self) -> Option<&Object> {
1094 Json::Object(ref map) => Some(map),
1099 /// Returns true if the Json value is an Array. Returns false otherwise.
1100 pub fn is_array(&self) -> bool {
1101 self.as_array().is_some()
1104 /// If the Json value is an Array, returns the associated vector.
1105 /// Returns None otherwise.
1106 pub fn as_array(&self) -> Option<&Array> {
1108 Json::Array(ref array) => Some(&*array),
1113 /// Returns true if the Json value is a String. Returns false otherwise.
1114 pub fn is_string(&self) -> bool {
1115 self.as_string().is_some()
1118 /// If the Json value is a String, returns the associated str.
1119 /// Returns None otherwise.
1120 pub fn as_string(&self) -> Option<&str> {
1122 Json::String(ref s) => Some(&s[..]),
1127 /// Returns true if the Json value is a Number. Returns false otherwise.
1128 pub fn is_number(&self) -> bool {
1130 Json::I64(_) | Json::U64(_) | Json::F64(_) => true,
1135 /// Returns true if the Json value is a i64. Returns false otherwise.
1136 pub fn is_i64(&self) -> bool {
1138 Json::I64(_) => true,
1143 /// Returns true if the Json value is a u64. Returns false otherwise.
1144 pub fn is_u64(&self) -> bool {
1146 Json::U64(_) => true,
1151 /// Returns true if the Json value is a f64. Returns false otherwise.
1152 pub fn is_f64(&self) -> bool {
1154 Json::F64(_) => true,
1159 /// If the Json value is a number, return or cast it to a i64.
1160 /// Returns None otherwise.
1161 pub fn as_i64(&self) -> Option<i64> {
1163 Json::I64(n) => Some(n),
1164 Json::U64(n) => Some(n as i64),
1169 /// If the Json value is a number, return or cast it to a u64.
1170 /// Returns None otherwise.
1171 pub fn as_u64(&self) -> Option<u64> {
1173 Json::I64(n) => Some(n as u64),
1174 Json::U64(n) => Some(n),
1179 /// If the Json value is a number, return or cast it to a f64.
1180 /// Returns None otherwise.
1181 pub fn as_f64(&self) -> Option<f64> {
1183 Json::I64(n) => Some(n as f64),
1184 Json::U64(n) => Some(n as f64),
1185 Json::F64(n) => Some(n),
1190 /// Returns true if the Json value is a Boolean. Returns false otherwise.
1191 pub fn is_boolean(&self) -> bool {
1192 self.as_boolean().is_some()
1195 /// If the Json value is a Boolean, returns the associated bool.
1196 /// Returns None otherwise.
1197 pub fn as_boolean(&self) -> Option<bool> {
1199 Json::Boolean(b) => Some(b),
1204 /// Returns true if the Json value is a Null. Returns false otherwise.
1205 pub fn is_null(&self) -> bool {
1206 self.as_null().is_some()
1209 /// If the Json value is a Null, returns ().
1210 /// Returns None otherwise.
1211 pub fn as_null(&self) -> Option<()> {
1213 Json::Null => Some(()),
1219 impl<'a> Index<&'a str> for Json {
1222 fn index(&self, idx: &'a str) -> &Json {
1223 self.find(idx).unwrap()
1227 impl Index<usize> for Json {
1230 fn index<'a>(&'a self, idx: usize) -> &'a Json {
1232 Json::Array(ref v) => &v[idx],
1233 _ => panic!("can only index Json with usize if it is an array")
1238 /// The output of the streaming parser.
1239 #[derive(PartialEq, Clone, Debug)]
1240 pub enum JsonEvent {
1249 StringValue(string::String),
1254 #[derive(PartialEq, Debug)]
1256 // Parse a value in an array, true means first element.
1258 // Parse ',' or ']' after an element in an array.
1260 // Parse a key:value in an object, true means first element.
1262 // Parse ',' or ']' after an element in an object.
1266 // Expecting the stream to end.
1268 // Parsing can't continue.
1272 /// A Stack represents the current position of the parser in the logical
1273 /// structure of the JSON stream.
1274 /// For example foo.bar[3].x
1276 stack: Vec<InternalStackElement>,
1277 str_buffer: Vec<u8>,
1280 /// StackElements compose a Stack.
1281 /// For example, StackElement::Key("foo"), StackElement::Key("bar"),
1282 /// StackElement::Index(3) and StackElement::Key("x") are the
1283 /// StackElements compositing the stack that represents foo.bar[3].x
1284 #[derive(PartialEq, Clone, Debug)]
1285 pub enum StackElement<'l> {
1290 // Internally, Key elements are stored as indices in a buffer to avoid
1291 // allocating a string for every member of an object.
1292 #[derive(PartialEq, Clone, Debug)]
1293 enum InternalStackElement {
1295 InternalKey(u16, u16), // start, size
1299 pub fn new() -> Stack {
1300 Stack { stack: Vec::new(), str_buffer: Vec::new() }
1303 /// Returns The number of elements in the Stack.
1304 pub fn len(&self) -> usize { self.stack.len() }
1306 /// Returns true if the stack is empty.
1307 pub fn is_empty(&self) -> bool { self.stack.is_empty() }
1309 /// Provides access to the StackElement at a given index.
1310 /// lower indices are at the bottom of the stack while higher indices are
1312 pub fn get<'l>(&'l self, idx: usize) -> StackElement<'l> {
1313 match self.stack[idx] {
1314 InternalIndex(i) => StackElement::Index(i),
1315 InternalKey(start, size) => {
1316 StackElement::Key(str::from_utf8(
1317 &self.str_buffer[start as usize .. start as usize + size as usize])
1323 /// Compares this stack with an array of StackElements.
1324 pub fn is_equal_to(&self, rhs: &[StackElement]) -> bool {
1325 if self.stack.len() != rhs.len() { return false; }
1326 for (i, r) in rhs.iter().enumerate() {
1327 if self.get(i) != *r { return false; }
1332 /// Returns true if the bottom-most elements of this stack are the same as
1333 /// the ones passed as parameter.
1334 pub fn starts_with(&self, rhs: &[StackElement]) -> bool {
1335 if self.stack.len() < rhs.len() { return false; }
1336 for (i, r) in rhs.iter().enumerate() {
1337 if self.get(i) != *r { return false; }
1342 /// Returns true if the top-most elements of this stack are the same as
1343 /// the ones passed as parameter.
1344 pub fn ends_with(&self, rhs: &[StackElement]) -> bool {
1345 if self.stack.len() < rhs.len() { return false; }
1346 let offset = self.stack.len() - rhs.len();
1347 for (i, r) in rhs.iter().enumerate() {
1348 if self.get(i + offset) != *r { return false; }
1353 /// Returns the top-most element (if any).
1354 pub fn top<'l>(&'l self) -> Option<StackElement<'l>> {
1355 match self.stack.last() {
1357 Some(&InternalIndex(i)) => Some(StackElement::Index(i)),
1358 Some(&InternalKey(start, size)) => {
1359 Some(StackElement::Key(str::from_utf8(
1360 &self.str_buffer[start as usize .. (start+size) as usize]
1366 // Used by Parser to insert StackElement::Key elements at the top of the stack.
1367 fn push_key(&mut self, key: string::String) {
1368 self.stack.push(InternalKey(self.str_buffer.len() as u16, key.len() as u16));
1369 for c in key.as_bytes() {
1370 self.str_buffer.push(*c);
1374 // Used by Parser to insert StackElement::Index elements at the top of the stack.
1375 fn push_index(&mut self, index: u32) {
1376 self.stack.push(InternalIndex(index));
1379 // Used by Parser to remove the top-most element of the stack.
1381 assert!(!self.is_empty());
1382 match *self.stack.last().unwrap() {
1383 InternalKey(_, sz) => {
1384 let new_size = self.str_buffer.len() - sz as usize;
1385 self.str_buffer.truncate(new_size);
1387 InternalIndex(_) => {}
1392 // Used by Parser to test whether the top-most element is an index.
1393 fn last_is_index(&self) -> bool {
1394 if self.is_empty() { return false; }
1395 return match *self.stack.last().unwrap() {
1396 InternalIndex(_) => true,
1401 // Used by Parser to increment the index of the top-most element.
1402 fn bump_index(&mut self) {
1403 let len = self.stack.len();
1404 let idx = match *self.stack.last().unwrap() {
1405 InternalIndex(i) => { i + 1 }
1408 self.stack[len - 1] = InternalIndex(idx);
1412 /// A streaming JSON parser implemented as an iterator of JsonEvent, consuming
1413 /// an iterator of char.
1414 pub struct Parser<T> {
1419 // We maintain a stack representing where we are in the logical structure
1420 // of the JSON stream.
1422 // A state machine is kept to make it possible to interrupt and resume parsing.
1426 impl<T: Iterator<Item=char>> Iterator for Parser<T> {
1427 type Item = JsonEvent;
1429 fn next(&mut self) -> Option<JsonEvent> {
1430 if self.state == ParseFinished {
1434 if self.state == ParseBeforeFinish {
1435 self.parse_whitespace();
1436 // Make sure there is no trailing characters.
1438 self.state = ParseFinished;
1441 return Some(self.error_event(TrailingCharacters));
1449 impl<T: Iterator<Item=char>> Parser<T> {
1450 /// Creates the JSON parser.
1451 pub fn new(rdr: T) -> Parser<T> {
1452 let mut p = Parser {
1457 stack: Stack::new(),
1464 /// Provides access to the current position in the logical structure of the
1466 pub fn stack<'l>(&'l self) -> &'l Stack {
1470 fn eof(&self) -> bool { self.ch.is_none() }
1471 fn ch_or_null(&self) -> char { self.ch.unwrap_or('\x00') }
1472 fn bump(&mut self) {
1473 self.ch = self.rdr.next();
1475 if self.ch_is('\n') {
1483 fn next_char(&mut self) -> Option<char> {
1487 fn ch_is(&self, c: char) -> bool {
1491 fn error<U>(&self, reason: ErrorCode) -> Result<U, ParserError> {
1492 Err(SyntaxError(reason, self.line, self.col))
1495 fn parse_whitespace(&mut self) {
1496 while self.ch_is(' ') ||
1499 self.ch_is('\r') { self.bump(); }
1502 fn parse_number(&mut self) -> JsonEvent {
1503 let mut neg = false;
1505 if self.ch_is('-') {
1510 let res = match self.parse_u64() {
1512 Err(e) => { return Error(e); }
1515 if self.ch_is('.') || self.ch_is('e') || self.ch_is('E') {
1516 let mut res = res as f64;
1518 if self.ch_is('.') {
1519 res = match self.parse_decimal(res) {
1521 Err(e) => { return Error(e); }
1525 if self.ch_is('e') || self.ch_is('E') {
1526 res = match self.parse_exponent(res) {
1528 Err(e) => { return Error(e); }
1539 let res = (res as i64).wrapping_neg();
1541 // Make sure we didn't underflow.
1543 Error(SyntaxError(InvalidNumber, self.line, self.col))
1553 fn parse_u64(&mut self) -> Result<u64, ParserError> {
1554 let mut accum = 0u64;
1555 let last_accum = 0; // necessary to detect overflow.
1557 match self.ch_or_null() {
1561 // A leading '0' must be the only digit before the decimal point.
1562 if let '0' ... '9' = self.ch_or_null() {
1563 return self.error(InvalidNumber)
1568 match self.ch_or_null() {
1569 c @ '0' ... '9' => {
1570 accum = accum.wrapping_mul(10);
1571 accum = accum.wrapping_add((c as u64) - ('0' as u64));
1573 // Detect overflow by comparing to the last value.
1574 if accum <= last_accum { return self.error(InvalidNumber); }
1582 _ => return self.error(InvalidNumber),
1588 fn parse_decimal(&mut self, mut res: f64) -> Result<f64, ParserError> {
1591 // Make sure a digit follows the decimal place.
1592 match self.ch_or_null() {
1594 _ => return self.error(InvalidNumber)
1599 match self.ch_or_null() {
1600 c @ '0' ... '9' => {
1602 res += (((c as isize) - ('0' as isize)) as f64) * dec;
1612 fn parse_exponent(&mut self, mut res: f64) -> Result<f64, ParserError> {
1616 let mut neg_exp = false;
1618 if self.ch_is('+') {
1620 } else if self.ch_is('-') {
1625 // Make sure a digit follows the exponent place.
1626 match self.ch_or_null() {
1628 _ => return self.error(InvalidNumber)
1631 match self.ch_or_null() {
1632 c @ '0' ... '9' => {
1634 exp += (c as usize) - ('0' as usize);
1642 let exp = 10_f64.powi(exp as i32);
1652 fn decode_hex_escape(&mut self) -> Result<u16, ParserError> {
1655 while i < 4 && !self.eof() {
1657 n = match self.ch_or_null() {
1658 c @ '0' ... '9' => n * 16 + ((c as u16) - ('0' as u16)),
1659 'a' | 'A' => n * 16 + 10,
1660 'b' | 'B' => n * 16 + 11,
1661 'c' | 'C' => n * 16 + 12,
1662 'd' | 'D' => n * 16 + 13,
1663 'e' | 'E' => n * 16 + 14,
1664 'f' | 'F' => n * 16 + 15,
1665 _ => return self.error(InvalidEscape)
1671 // Error out if we didn't parse 4 digits.
1673 return self.error(InvalidEscape);
1679 fn parse_str(&mut self) -> Result<string::String, ParserError> {
1680 let mut escape = false;
1681 let mut res = string::String::new();
1686 return self.error(EOFWhileParsingString);
1690 match self.ch_or_null() {
1691 '"' => res.push('"'),
1692 '\\' => res.push('\\'),
1693 '/' => res.push('/'),
1694 'b' => res.push('\x08'),
1695 'f' => res.push('\x0c'),
1696 'n' => res.push('\n'),
1697 'r' => res.push('\r'),
1698 't' => res.push('\t'),
1699 'u' => match try!(self.decode_hex_escape()) {
1700 0xDC00 ... 0xDFFF => {
1701 return self.error(LoneLeadingSurrogateInHexEscape)
1704 // Non-BMP characters are encoded as a sequence of
1705 // two hex escapes, representing UTF-16 surrogates.
1706 n1 @ 0xD800 ... 0xDBFF => {
1707 match (self.next_char(), self.next_char()) {
1708 (Some('\\'), Some('u')) => (),
1709 _ => return self.error(UnexpectedEndOfHexEscape),
1712 let n2 = try!(self.decode_hex_escape());
1713 if n2 < 0xDC00 || n2 > 0xDFFF {
1714 return self.error(LoneLeadingSurrogateInHexEscape)
1716 let c = (((n1 - 0xD800) as u32) << 10 |
1717 (n2 - 0xDC00) as u32) + 0x1_0000;
1718 res.push(char::from_u32(c).unwrap());
1721 n => match char::from_u32(n as u32) {
1722 Some(c) => res.push(c),
1723 None => return self.error(InvalidUnicodeCodePoint),
1726 _ => return self.error(InvalidEscape),
1729 } else if self.ch_is('\\') {
1737 Some(c) => res.push(c),
1738 None => unreachable!()
1744 // Invoked at each iteration, consumes the stream until it has enough
1745 // information to return a JsonEvent.
1746 // Manages an internal state so that parsing can be interrupted and resumed.
1747 // Also keeps track of the position in the logical structure of the json
1748 // stream isize the form of a stack that can be queried by the user using the
1750 fn parse(&mut self) -> JsonEvent {
1752 // The only paths where the loop can spin a new iteration
1753 // are in the cases ParseArrayComma and ParseObjectComma if ','
1754 // is parsed. In these cases the state is set to (respectively)
1755 // ParseArray(false) and ParseObject(false), which always return,
1756 // so there is no risk of getting stuck in an infinite loop.
1757 // All other paths return before the end of the loop's iteration.
1758 self.parse_whitespace();
1762 return self.parse_start();
1764 ParseArray(first) => {
1765 return self.parse_array(first);
1767 ParseArrayComma => {
1768 match self.parse_array_comma_or_end() {
1769 Some(evt) => { return evt; }
1773 ParseObject(first) => {
1774 return self.parse_object(first);
1776 ParseObjectComma => {
1778 if self.ch_is(',') {
1779 self.state = ParseObject(false);
1782 return self.parse_object_end();
1786 return self.error_event(InvalidSyntax);
1792 fn parse_start(&mut self) -> JsonEvent {
1793 let val = self.parse_value();
1794 self.state = match val {
1795 Error(_) => ParseFinished,
1796 ArrayStart => ParseArray(true),
1797 ObjectStart => ParseObject(true),
1798 _ => ParseBeforeFinish,
1803 fn parse_array(&mut self, first: bool) -> JsonEvent {
1804 if self.ch_is(']') {
1806 self.error_event(InvalidSyntax)
1808 self.state = if self.stack.is_empty() {
1810 } else if self.stack.last_is_index() {
1820 self.stack.push_index(0);
1822 let val = self.parse_value();
1823 self.state = match val {
1824 Error(_) => ParseFinished,
1825 ArrayStart => ParseArray(true),
1826 ObjectStart => ParseObject(true),
1827 _ => ParseArrayComma,
1833 fn parse_array_comma_or_end(&mut self) -> Option<JsonEvent> {
1834 if self.ch_is(',') {
1835 self.stack.bump_index();
1836 self.state = ParseArray(false);
1839 } else if self.ch_is(']') {
1841 self.state = if self.stack.is_empty() {
1843 } else if self.stack.last_is_index() {
1850 } else if self.eof() {
1851 Some(self.error_event(EOFWhileParsingArray))
1853 Some(self.error_event(InvalidSyntax))
1857 fn parse_object(&mut self, first: bool) -> JsonEvent {
1858 if self.ch_is('}') {
1860 if self.stack.is_empty() {
1861 return self.error_event(TrailingComma);
1866 self.state = if self.stack.is_empty() {
1868 } else if self.stack.last_is_index() {
1877 return self.error_event(EOFWhileParsingObject);
1879 if !self.ch_is('"') {
1880 return self.error_event(KeyMustBeAString);
1882 let s = match self.parse_str() {
1885 self.state = ParseFinished;
1889 self.parse_whitespace();
1891 return self.error_event(EOFWhileParsingObject);
1892 } else if self.ch_or_null() != ':' {
1893 return self.error_event(ExpectedColon);
1895 self.stack.push_key(s);
1897 self.parse_whitespace();
1899 let val = self.parse_value();
1901 self.state = match val {
1902 Error(_) => ParseFinished,
1903 ArrayStart => ParseArray(true),
1904 ObjectStart => ParseObject(true),
1905 _ => ParseObjectComma,
1910 fn parse_object_end(&mut self) -> JsonEvent {
1911 if self.ch_is('}') {
1912 self.state = if self.stack.is_empty() {
1914 } else if self.stack.last_is_index() {
1921 } else if self.eof() {
1922 self.error_event(EOFWhileParsingObject)
1924 self.error_event(InvalidSyntax)
1928 fn parse_value(&mut self) -> JsonEvent {
1929 if self.eof() { return self.error_event(EOFWhileParsingValue); }
1930 match self.ch_or_null() {
1931 'n' => { self.parse_ident("ull", NullValue) }
1932 't' => { self.parse_ident("rue", BooleanValue(true)) }
1933 'f' => { self.parse_ident("alse", BooleanValue(false)) }
1934 '0' ... '9' | '-' => self.parse_number(),
1935 '"' => match self.parse_str() {
1936 Ok(s) => StringValue(s),
1947 _ => { self.error_event(InvalidSyntax) }
1951 fn parse_ident(&mut self, ident: &str, value: JsonEvent) -> JsonEvent {
1952 if ident.chars().all(|c| Some(c) == self.next_char()) {
1956 Error(SyntaxError(InvalidSyntax, self.line, self.col))
1960 fn error_event(&mut self, reason: ErrorCode) -> JsonEvent {
1961 self.state = ParseFinished;
1962 Error(SyntaxError(reason, self.line, self.col))
1966 /// A Builder consumes a json::Parser to create a generic Json structure.
1967 pub struct Builder<T> {
1969 token: Option<JsonEvent>,
1972 impl<T: Iterator<Item=char>> Builder<T> {
1973 /// Create a JSON Builder.
1974 pub fn new(src: T) -> Builder<T> {
1975 Builder { parser: Parser::new(src), token: None, }
1978 // Decode a Json value from a Parser.
1979 pub fn build(&mut self) -> Result<Json, BuilderError> {
1981 let result = self.build_value();
1985 Some(Error(ref e)) => { return Err(e.clone()); }
1986 ref tok => { panic!("unexpected token {:?}", tok.clone()); }
1991 fn bump(&mut self) {
1992 self.token = self.parser.next();
1995 fn build_value(&mut self) -> Result<Json, BuilderError> {
1997 Some(NullValue) => Ok(Json::Null),
1998 Some(I64Value(n)) => Ok(Json::I64(n)),
1999 Some(U64Value(n)) => Ok(Json::U64(n)),
2000 Some(F64Value(n)) => Ok(Json::F64(n)),
2001 Some(BooleanValue(b)) => Ok(Json::Boolean(b)),
2002 Some(StringValue(ref mut s)) => {
2003 let mut temp = string::String::new();
2005 Ok(Json::String(temp))
2007 Some(Error(ref e)) => Err(e.clone()),
2008 Some(ArrayStart) => self.build_array(),
2009 Some(ObjectStart) => self.build_object(),
2010 Some(ObjectEnd) => self.parser.error(InvalidSyntax),
2011 Some(ArrayEnd) => self.parser.error(InvalidSyntax),
2012 None => self.parser.error(EOFWhileParsingValue),
2016 fn build_array(&mut self) -> Result<Json, BuilderError> {
2018 let mut values = Vec::new();
2021 if self.token == Some(ArrayEnd) {
2022 return Ok(Json::Array(values.into_iter().collect()));
2024 match self.build_value() {
2025 Ok(v) => values.push(v),
2026 Err(e) => { return Err(e) }
2032 fn build_object(&mut self) -> Result<Json, BuilderError> {
2035 let mut values = BTreeMap::new();
2039 Some(ObjectEnd) => { return Ok(Json::Object(values)); }
2040 Some(Error(ref e)) => { return Err(e.clone()); }
2044 let key = match self.parser.stack().top() {
2045 Some(StackElement::Key(k)) => { k.to_owned() }
2046 _ => { panic!("invalid state"); }
2048 match self.build_value() {
2049 Ok(value) => { values.insert(key, value); }
2050 Err(e) => { return Err(e); }
2054 self.parser.error(EOFWhileParsingObject)
2058 /// Decodes a json value from an `&mut io::Read`
2059 pub fn from_reader(rdr: &mut Read) -> Result<Json, BuilderError> {
2060 let mut contents = Vec::new();
2061 match rdr.read_to_end(&mut contents) {
2063 Err(e) => return Err(io_error_to_error(e))
2065 let s = match str::from_utf8(&contents).ok() {
2067 _ => return Err(SyntaxError(NotUtf8, 0, 0))
2069 let mut builder = Builder::new(s.chars());
2073 /// Decodes a json value from a string
2074 pub fn from_str(s: &str) -> Result<Json, BuilderError> {
2075 let mut builder = Builder::new(s.chars());
2079 /// A structure to decode JSON to values in rust.
2080 pub struct Decoder {
2085 /// Creates a new decoder instance for decoding the specified JSON value.
2086 pub fn new(json: Json) -> Decoder {
2087 Decoder { stack: vec![json] }
2092 fn pop(&mut self) -> Json {
2093 self.stack.pop().unwrap()
2097 macro_rules! expect {
2098 ($e:expr, Null) => ({
2100 Json::Null => Ok(()),
2101 other => Err(ExpectedError("Null".to_owned(),
2102 format!("{}", other)))
2105 ($e:expr, $t:ident) => ({
2107 Json::$t(v) => Ok(v),
2109 Err(ExpectedError(stringify!($t).to_owned(),
2110 format!("{}", other)))
2116 macro_rules! read_primitive {
2117 ($name:ident, $ty:ty) => {
2118 fn $name(&mut self) -> DecodeResult<$ty> {
2120 Json::I64(f) => Ok(f as $ty),
2121 Json::U64(f) => Ok(f as $ty),
2122 Json::F64(f) => Err(ExpectedError("Integer".to_owned(), format!("{}", f))),
2123 // re: #12967.. a type w/ numeric keys (ie HashMap<usize, V> etc)
2124 // is going to have a string here, as per JSON spec.
2125 Json::String(s) => match s.parse().ok() {
2127 None => Err(ExpectedError("Number".to_owned(), s)),
2129 value => Err(ExpectedError("Number".to_owned(), format!("{}", value))),
2135 impl ::Decoder for Decoder {
2136 type Error = DecoderError;
2138 fn read_nil(&mut self) -> DecodeResult<()> {
2139 expect!(self.pop(), Null)
2142 read_primitive! { read_uint, usize }
2143 read_primitive! { read_u8, u8 }
2144 read_primitive! { read_u16, u16 }
2145 read_primitive! { read_u32, u32 }
2146 read_primitive! { read_u64, u64 }
2147 read_primitive! { read_int, isize }
2148 read_primitive! { read_i8, i8 }
2149 read_primitive! { read_i16, i16 }
2150 read_primitive! { read_i32, i32 }
2151 read_primitive! { read_i64, i64 }
2153 fn read_f32(&mut self) -> DecodeResult<f32> { self.read_f64().map(|x| x as f32) }
2155 fn read_f64(&mut self) -> DecodeResult<f64> {
2157 Json::I64(f) => Ok(f as f64),
2158 Json::U64(f) => Ok(f as f64),
2159 Json::F64(f) => Ok(f),
2160 Json::String(s) => {
2161 // re: #12967.. a type w/ numeric keys (ie HashMap<usize, V> etc)
2162 // is going to have a string here, as per JSON spec.
2163 match s.parse().ok() {
2165 None => Err(ExpectedError("Number".to_owned(), s)),
2168 Json::Null => Ok(f64::NAN),
2169 value => Err(ExpectedError("Number".to_owned(), format!("{}", value)))
2173 fn read_bool(&mut self) -> DecodeResult<bool> {
2174 expect!(self.pop(), Boolean)
2177 fn read_char(&mut self) -> DecodeResult<char> {
2178 let s = try!(self.read_str());
2180 let mut it = s.chars();
2181 match (it.next(), it.next()) {
2182 // exactly one character
2183 (Some(c), None) => return Ok(c),
2187 Err(ExpectedError("single character string".to_owned(), format!("{}", s)))
2190 fn read_str(&mut self) -> DecodeResult<string::String> {
2191 expect!(self.pop(), String)
2194 fn read_enum<T, F>(&mut self, _name: &str, f: F) -> DecodeResult<T> where
2195 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2200 fn read_enum_variant<T, F>(&mut self, names: &[&str],
2201 mut f: F) -> DecodeResult<T>
2202 where F: FnMut(&mut Decoder, usize) -> DecodeResult<T>,
2204 let name = match self.pop() {
2205 Json::String(s) => s,
2206 Json::Object(mut o) => {
2207 let n = match o.remove(&"variant".to_owned()) {
2208 Some(Json::String(s)) => s,
2210 return Err(ExpectedError("String".to_owned(), format!("{}", val)))
2213 return Err(MissingFieldError("variant".to_owned()))
2216 match o.remove(&"fields".to_string()) {
2217 Some(Json::Array(l)) => {
2218 for field in l.into_iter().rev() {
2219 self.stack.push(field);
2223 return Err(ExpectedError("Array".to_owned(), format!("{}", val)))
2226 return Err(MissingFieldError("fields".to_owned()))
2232 return Err(ExpectedError("String or Object".to_owned(), format!("{}", json)))
2235 let idx = match names.iter().position(|n| *n == &name[..]) {
2237 None => return Err(UnknownVariantError(name))
2242 fn read_enum_variant_arg<T, F>(&mut self, _idx: usize, f: F) -> DecodeResult<T> where
2243 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2248 fn read_enum_struct_variant<T, F>(&mut self, names: &[&str], f: F) -> DecodeResult<T> where
2249 F: FnMut(&mut Decoder, usize) -> DecodeResult<T>,
2251 self.read_enum_variant(names, f)
2255 fn read_enum_struct_variant_field<T, F>(&mut self,
2259 -> DecodeResult<T> where
2260 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2262 self.read_enum_variant_arg(idx, f)
2265 fn read_struct<T, F>(&mut self, _name: &str, _len: usize, f: F) -> DecodeResult<T> where
2266 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2268 let value = try!(f(self));
2273 fn read_struct_field<T, F>(&mut self,
2277 -> DecodeResult<T> where
2278 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2280 let mut obj = try!(expect!(self.pop(), Object));
2282 let value = match obj.remove(&name.to_string()) {
2284 // Add a Null and try to parse it as an Option<_>
2285 // to get None as a default value.
2286 self.stack.push(Json::Null);
2289 Err(_) => return Err(MissingFieldError(name.to_string())),
2293 self.stack.push(json);
2297 self.stack.push(Json::Object(obj));
2301 fn read_tuple<T, F>(&mut self, tuple_len: usize, f: F) -> DecodeResult<T> where
2302 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2304 self.read_seq(move |d, len| {
2305 if len == tuple_len {
2308 Err(ExpectedError(format!("Tuple{}", tuple_len), format!("Tuple{}", len)))
2313 fn read_tuple_arg<T, F>(&mut self, idx: usize, f: F) -> DecodeResult<T> where
2314 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2316 self.read_seq_elt(idx, f)
2319 fn read_tuple_struct<T, F>(&mut self,
2323 -> DecodeResult<T> where
2324 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2326 self.read_tuple(len, f)
2329 fn read_tuple_struct_arg<T, F>(&mut self,
2332 -> DecodeResult<T> where
2333 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2335 self.read_tuple_arg(idx, f)
2338 fn read_option<T, F>(&mut self, mut f: F) -> DecodeResult<T> where
2339 F: FnMut(&mut Decoder, bool) -> DecodeResult<T>,
2342 Json::Null => f(self, false),
2343 value => { self.stack.push(value); f(self, true) }
2347 fn read_seq<T, F>(&mut self, f: F) -> DecodeResult<T> where
2348 F: FnOnce(&mut Decoder, usize) -> DecodeResult<T>,
2350 let array = try!(expect!(self.pop(), Array));
2351 let len = array.len();
2352 for v in array.into_iter().rev() {
2358 fn read_seq_elt<T, F>(&mut self, _idx: usize, f: F) -> DecodeResult<T> where
2359 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2364 fn read_map<T, F>(&mut self, f: F) -> DecodeResult<T> where
2365 F: FnOnce(&mut Decoder, usize) -> DecodeResult<T>,
2367 let obj = try!(expect!(self.pop(), Object));
2368 let len = obj.len();
2369 for (key, value) in obj {
2370 self.stack.push(value);
2371 self.stack.push(Json::String(key));
2376 fn read_map_elt_key<T, F>(&mut self, _idx: usize, f: F) -> DecodeResult<T> where
2377 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2382 fn read_map_elt_val<T, F>(&mut self, _idx: usize, f: F) -> DecodeResult<T> where
2383 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2388 fn error(&mut self, err: &str) -> DecoderError {
2389 ApplicationError(err.to_string())
2393 /// A trait for converting values to JSON
2395 /// Converts the value of `self` to an instance of JSON
2396 fn to_json(&self) -> Json;
2399 macro_rules! to_json_impl_i64 {
2401 $(impl ToJson for $t {
2402 fn to_json(&self) -> Json {
2403 Json::I64(*self as i64)
2409 to_json_impl_i64! { isize, i8, i16, i32, i64 }
2411 macro_rules! to_json_impl_u64 {
2413 $(impl ToJson for $t {
2414 fn to_json(&self) -> Json {
2415 Json::U64(*self as u64)
2421 to_json_impl_u64! { usize, u8, u16, u32, u64 }
2423 impl ToJson for Json {
2424 fn to_json(&self) -> Json { self.clone() }
2427 impl ToJson for f32 {
2428 fn to_json(&self) -> Json { (*self as f64).to_json() }
2431 impl ToJson for f64 {
2432 fn to_json(&self) -> Json {
2433 match self.classify() {
2434 Fp::Nan | Fp::Infinite => Json::Null,
2435 _ => Json::F64(*self)
2440 impl ToJson for () {
2441 fn to_json(&self) -> Json { Json::Null }
2444 impl ToJson for bool {
2445 fn to_json(&self) -> Json { Json::Boolean(*self) }
2448 impl ToJson for str {
2449 fn to_json(&self) -> Json { Json::String(self.to_string()) }
2452 impl ToJson for string::String {
2453 fn to_json(&self) -> Json { Json::String((*self).clone()) }
2456 macro_rules! tuple_impl {
2457 // use variables to indicate the arity of the tuple
2458 ($($tyvar:ident),* ) => {
2459 // the trailing commas are for the 1 tuple
2461 $( $tyvar : ToJson ),*
2462 > ToJson for ( $( $tyvar ),* , ) {
2465 #[allow(non_snake_case)]
2466 fn to_json(&self) -> Json {
2468 ($(ref $tyvar),*,) => Json::Array(vec![$($tyvar.to_json()),*])
2477 tuple_impl!{A, B, C}
2478 tuple_impl!{A, B, C, D}
2479 tuple_impl!{A, B, C, D, E}
2480 tuple_impl!{A, B, C, D, E, F}
2481 tuple_impl!{A, B, C, D, E, F, G}
2482 tuple_impl!{A, B, C, D, E, F, G, H}
2483 tuple_impl!{A, B, C, D, E, F, G, H, I}
2484 tuple_impl!{A, B, C, D, E, F, G, H, I, J}
2485 tuple_impl!{A, B, C, D, E, F, G, H, I, J, K}
2486 tuple_impl!{A, B, C, D, E, F, G, H, I, J, K, L}
2488 impl<A: ToJson> ToJson for [A] {
2489 fn to_json(&self) -> Json { Json::Array(self.iter().map(|elt| elt.to_json()).collect()) }
2492 impl<A: ToJson> ToJson for Vec<A> {
2493 fn to_json(&self) -> Json { Json::Array(self.iter().map(|elt| elt.to_json()).collect()) }
2496 impl<A: ToJson> ToJson for BTreeMap<string::String, A> {
2497 fn to_json(&self) -> Json {
2498 let mut d = BTreeMap::new();
2499 for (key, value) in self {
2500 d.insert((*key).clone(), value.to_json());
2506 impl<A: ToJson> ToJson for HashMap<string::String, A> {
2507 fn to_json(&self) -> Json {
2508 let mut d = BTreeMap::new();
2509 for (key, value) in self {
2510 d.insert((*key).clone(), value.to_json());
2516 impl<A:ToJson> ToJson for Option<A> {
2517 fn to_json(&self) -> Json {
2520 Some(ref value) => value.to_json()
2525 struct FormatShim<'a, 'b: 'a> {
2526 inner: &'a mut fmt::Formatter<'b>,
2529 impl<'a, 'b> fmt::Write for FormatShim<'a, 'b> {
2530 fn write_str(&mut self, s: &str) -> fmt::Result {
2531 match self.inner.write_str(s) {
2533 Err(_) => Err(fmt::Error)
2538 impl fmt::Display for Json {
2539 /// Encodes a json value into a string
2540 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
2541 let mut shim = FormatShim { inner: f };
2542 let mut encoder = Encoder::new(&mut shim);
2543 match self.encode(&mut encoder) {
2545 Err(_) => Err(fmt::Error)
2550 impl<'a> fmt::Display for PrettyJson<'a> {
2551 /// Encodes a json value into a string
2552 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
2553 let mut shim = FormatShim { inner: f };
2554 let mut encoder = PrettyEncoder::new(&mut shim);
2555 match self.inner.encode(&mut encoder) {
2557 Err(_) => Err(fmt::Error)
2562 impl<'a, T: Encodable> fmt::Display for AsJson<'a, T> {
2563 /// Encodes a json value into a string
2564 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
2565 let mut shim = FormatShim { inner: f };
2566 let mut encoder = Encoder::new(&mut shim);
2567 match self.inner.encode(&mut encoder) {
2569 Err(_) => Err(fmt::Error)
2574 impl<'a, T> AsPrettyJson<'a, T> {
2575 /// Set the indentation level for the emitted JSON
2576 pub fn indent(mut self, indent: usize) -> AsPrettyJson<'a, T> {
2577 self.indent = Some(indent);
2582 impl<'a, T: Encodable> fmt::Display for AsPrettyJson<'a, T> {
2583 /// Encodes a json value into a string
2584 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
2585 let mut shim = FormatShim { inner: f };
2586 let mut encoder = PrettyEncoder::new(&mut shim);
2588 Some(n) => encoder.set_indent(n),
2591 match self.inner.encode(&mut encoder) {
2593 Err(_) => Err(fmt::Error)
2598 impl FromStr for Json {
2599 type Err = BuilderError;
2600 fn from_str(s: &str) -> Result<Json, BuilderError> {
2608 use self::Animal::*;
2609 use self::DecodeEnum::*;
2610 use self::test::Bencher;
2611 use {Encodable, Decodable};
2613 use super::ErrorCode::*;
2614 use super::ParserError::*;
2615 use super::DecoderError::*;
2616 use super::JsonEvent::*;
2617 use super::{Json, from_str, DecodeResult, DecoderError, JsonEvent, Parser,
2618 StackElement, Stack, Decoder, Encoder, EncoderError};
2619 use std::{i64, u64, f32, f64};
2620 use std::io::prelude::*;
2621 use std::collections::BTreeMap;
2624 #[derive(RustcDecodable, Eq, PartialEq, Debug)]
2630 fn test_decode_option_none() {
2632 let obj: OptionData = super::decode(s).unwrap();
2633 assert_eq!(obj, OptionData { opt: None });
2637 fn test_decode_option_some() {
2638 let s = "{ \"opt\": 10 }";
2639 let obj: OptionData = super::decode(s).unwrap();
2640 assert_eq!(obj, OptionData { opt: Some(10) });
2644 fn test_decode_option_malformed() {
2645 check_err::<OptionData>("{ \"opt\": [] }",
2646 ExpectedError("Number".to_string(), "[]".to_string()));
2647 check_err::<OptionData>("{ \"opt\": false }",
2648 ExpectedError("Number".to_string(), "false".to_string()));
2651 #[derive(PartialEq, RustcEncodable, RustcDecodable, Debug)]
2654 Frog(string::String, isize)
2657 #[derive(PartialEq, RustcEncodable, RustcDecodable, Debug)]
2661 c: Vec<string::String>,
2664 #[derive(PartialEq, RustcEncodable, RustcDecodable, Debug)]
2669 fn mk_object(items: &[(string::String, Json)]) -> Json {
2670 let mut d = BTreeMap::new();
2674 (ref key, ref value) => { d.insert((*key).clone(), (*value).clone()); },
2682 fn test_from_str_trait() {
2684 assert!(s.parse::<Json>().unwrap() == s.parse().unwrap());
2688 fn test_write_null() {
2689 assert_eq!(Null.to_string(), "null");
2690 assert_eq!(Null.pretty().to_string(), "null");
2694 fn test_write_i64() {
2695 assert_eq!(U64(0).to_string(), "0");
2696 assert_eq!(U64(0).pretty().to_string(), "0");
2698 assert_eq!(U64(1234).to_string(), "1234");
2699 assert_eq!(U64(1234).pretty().to_string(), "1234");
2701 assert_eq!(I64(-5678).to_string(), "-5678");
2702 assert_eq!(I64(-5678).pretty().to_string(), "-5678");
2704 assert_eq!(U64(7650007200025252000).to_string(), "7650007200025252000");
2705 assert_eq!(U64(7650007200025252000).pretty().to_string(), "7650007200025252000");
2709 fn test_write_f64() {
2710 assert_eq!(F64(3.0).to_string(), "3.0");
2711 assert_eq!(F64(3.0).pretty().to_string(), "3.0");
2713 assert_eq!(F64(3.1).to_string(), "3.1");
2714 assert_eq!(F64(3.1).pretty().to_string(), "3.1");
2716 assert_eq!(F64(-1.5).to_string(), "-1.5");
2717 assert_eq!(F64(-1.5).pretty().to_string(), "-1.5");
2719 assert_eq!(F64(0.5).to_string(), "0.5");
2720 assert_eq!(F64(0.5).pretty().to_string(), "0.5");
2722 assert_eq!(F64(f64::NAN).to_string(), "null");
2723 assert_eq!(F64(f64::NAN).pretty().to_string(), "null");
2725 assert_eq!(F64(f64::INFINITY).to_string(), "null");
2726 assert_eq!(F64(f64::INFINITY).pretty().to_string(), "null");
2728 assert_eq!(F64(f64::NEG_INFINITY).to_string(), "null");
2729 assert_eq!(F64(f64::NEG_INFINITY).pretty().to_string(), "null");
2733 fn test_write_str() {
2734 assert_eq!(String("".to_string()).to_string(), "\"\"");
2735 assert_eq!(String("".to_string()).pretty().to_string(), "\"\"");
2737 assert_eq!(String("homura".to_string()).to_string(), "\"homura\"");
2738 assert_eq!(String("madoka".to_string()).pretty().to_string(), "\"madoka\"");
2742 fn test_write_bool() {
2743 assert_eq!(Boolean(true).to_string(), "true");
2744 assert_eq!(Boolean(true).pretty().to_string(), "true");
2746 assert_eq!(Boolean(false).to_string(), "false");
2747 assert_eq!(Boolean(false).pretty().to_string(), "false");
2751 fn test_write_array() {
2752 assert_eq!(Array(vec![]).to_string(), "[]");
2753 assert_eq!(Array(vec![]).pretty().to_string(), "[]");
2755 assert_eq!(Array(vec![Boolean(true)]).to_string(), "[true]");
2757 Array(vec![Boolean(true)]).pretty().to_string(),
2764 let long_test_array = Array(vec![
2767 Array(vec![String("foo\nbar".to_string()), F64(3.5)])]);
2769 assert_eq!(long_test_array.to_string(),
2770 "[false,null,[\"foo\\nbar\",3.5]]");
2772 long_test_array.pretty().to_string(),
2786 fn test_write_object() {
2787 assert_eq!(mk_object(&[]).to_string(), "{}");
2788 assert_eq!(mk_object(&[]).pretty().to_string(), "{}");
2792 ("a".to_string(), Boolean(true))
2797 mk_object(&[("a".to_string(), Boolean(true))]).pretty().to_string(),
2804 let complex_obj = mk_object(&[
2805 ("b".to_string(), Array(vec![
2806 mk_object(&[("c".to_string(), String("\x0c\r".to_string()))]),
2807 mk_object(&[("d".to_string(), String("".to_string()))])
2812 complex_obj.to_string(),
2815 {\"c\":\"\\f\\r\"},\
2821 complex_obj.pretty().to_string(),
2826 \"c\": \"\\f\\r\"\n \
2835 let a = mk_object(&[
2836 ("a".to_string(), Boolean(true)),
2837 ("b".to_string(), Array(vec![
2838 mk_object(&[("c".to_string(), String("\x0c\r".to_string()))]),
2839 mk_object(&[("d".to_string(), String("".to_string()))])
2843 // We can't compare the strings directly because the object fields be
2844 // printed in a different order.
2845 assert_eq!(a.clone(), a.to_string().parse().unwrap());
2846 assert_eq!(a.clone(), a.pretty().to_string().parse().unwrap());
2850 fn test_write_enum() {
2853 format!("{}", super::as_json(&animal)),
2857 format!("{}", super::as_pretty_json(&animal)),
2861 let animal = Frog("Henry".to_string(), 349);
2863 format!("{}", super::as_json(&animal)),
2864 "{\"variant\":\"Frog\",\"fields\":[\"Henry\",349]}"
2867 format!("{}", super::as_pretty_json(&animal)),
2869 \"variant\": \"Frog\",\n \
2878 macro_rules! check_encoder_for_simple {
2879 ($value:expr, $expected:expr) => ({
2880 let s = format!("{}", super::as_json(&$value));
2881 assert_eq!(s, $expected);
2883 let s = format!("{}", super::as_pretty_json(&$value));
2884 assert_eq!(s, $expected);
2889 fn test_write_some() {
2890 check_encoder_for_simple!(Some("jodhpurs".to_string()), "\"jodhpurs\"");
2894 fn test_write_none() {
2895 check_encoder_for_simple!(None::<string::String>, "null");
2899 fn test_write_char() {
2900 check_encoder_for_simple!('a', "\"a\"");
2901 check_encoder_for_simple!('\t', "\"\\t\"");
2902 check_encoder_for_simple!('\u{0000}', "\"\\u0000\"");
2903 check_encoder_for_simple!('\u{001b}', "\"\\u001b\"");
2904 check_encoder_for_simple!('\u{007f}', "\"\\u007f\"");
2905 check_encoder_for_simple!('\u{00a0}', "\"\u{00a0}\"");
2906 check_encoder_for_simple!('\u{abcd}', "\"\u{abcd}\"");
2907 check_encoder_for_simple!('\u{10ffff}', "\"\u{10ffff}\"");
2911 fn test_trailing_characters() {
2912 assert_eq!(from_str("nulla"), Err(SyntaxError(TrailingCharacters, 1, 5)));
2913 assert_eq!(from_str("truea"), Err(SyntaxError(TrailingCharacters, 1, 5)));
2914 assert_eq!(from_str("falsea"), Err(SyntaxError(TrailingCharacters, 1, 6)));
2915 assert_eq!(from_str("1a"), Err(SyntaxError(TrailingCharacters, 1, 2)));
2916 assert_eq!(from_str("[]a"), Err(SyntaxError(TrailingCharacters, 1, 3)));
2917 assert_eq!(from_str("{}a"), Err(SyntaxError(TrailingCharacters, 1, 3)));
2921 fn test_read_identifiers() {
2922 assert_eq!(from_str("n"), Err(SyntaxError(InvalidSyntax, 1, 2)));
2923 assert_eq!(from_str("nul"), Err(SyntaxError(InvalidSyntax, 1, 4)));
2924 assert_eq!(from_str("t"), Err(SyntaxError(InvalidSyntax, 1, 2)));
2925 assert_eq!(from_str("truz"), Err(SyntaxError(InvalidSyntax, 1, 4)));
2926 assert_eq!(from_str("f"), Err(SyntaxError(InvalidSyntax, 1, 2)));
2927 assert_eq!(from_str("faz"), Err(SyntaxError(InvalidSyntax, 1, 3)));
2929 assert_eq!(from_str("null"), Ok(Null));
2930 assert_eq!(from_str("true"), Ok(Boolean(true)));
2931 assert_eq!(from_str("false"), Ok(Boolean(false)));
2932 assert_eq!(from_str(" null "), Ok(Null));
2933 assert_eq!(from_str(" true "), Ok(Boolean(true)));
2934 assert_eq!(from_str(" false "), Ok(Boolean(false)));
2938 fn test_decode_identifiers() {
2939 let v: () = super::decode("null").unwrap();
2942 let v: bool = super::decode("true").unwrap();
2943 assert_eq!(v, true);
2945 let v: bool = super::decode("false").unwrap();
2946 assert_eq!(v, false);
2950 fn test_read_number() {
2951 assert_eq!(from_str("+"), Err(SyntaxError(InvalidSyntax, 1, 1)));
2952 assert_eq!(from_str("."), Err(SyntaxError(InvalidSyntax, 1, 1)));
2953 assert_eq!(from_str("NaN"), Err(SyntaxError(InvalidSyntax, 1, 1)));
2954 assert_eq!(from_str("-"), Err(SyntaxError(InvalidNumber, 1, 2)));
2955 assert_eq!(from_str("00"), Err(SyntaxError(InvalidNumber, 1, 2)));
2956 assert_eq!(from_str("1."), Err(SyntaxError(InvalidNumber, 1, 3)));
2957 assert_eq!(from_str("1e"), Err(SyntaxError(InvalidNumber, 1, 3)));
2958 assert_eq!(from_str("1e+"), Err(SyntaxError(InvalidNumber, 1, 4)));
2960 assert_eq!(from_str("18446744073709551616"), Err(SyntaxError(InvalidNumber, 1, 20)));
2961 assert_eq!(from_str("-9223372036854775809"), Err(SyntaxError(InvalidNumber, 1, 21)));
2963 assert_eq!(from_str("3"), Ok(U64(3)));
2964 assert_eq!(from_str("3.1"), Ok(F64(3.1)));
2965 assert_eq!(from_str("-1.2"), Ok(F64(-1.2)));
2966 assert_eq!(from_str("0.4"), Ok(F64(0.4)));
2967 assert_eq!(from_str("0.4e5"), Ok(F64(0.4e5)));
2968 assert_eq!(from_str("0.4e+15"), Ok(F64(0.4e15)));
2969 assert_eq!(from_str("0.4e-01"), Ok(F64(0.4e-01)));
2970 assert_eq!(from_str(" 3 "), Ok(U64(3)));
2972 assert_eq!(from_str("-9223372036854775808"), Ok(I64(i64::MIN)));
2973 assert_eq!(from_str("9223372036854775807"), Ok(U64(i64::MAX as u64)));
2974 assert_eq!(from_str("18446744073709551615"), Ok(U64(u64::MAX)));
2978 fn test_decode_numbers() {
2979 let v: f64 = super::decode("3").unwrap();
2982 let v: f64 = super::decode("3.1").unwrap();
2985 let v: f64 = super::decode("-1.2").unwrap();
2986 assert_eq!(v, -1.2);
2988 let v: f64 = super::decode("0.4").unwrap();
2991 let v: f64 = super::decode("0.4e5").unwrap();
2992 assert_eq!(v, 0.4e5);
2994 let v: f64 = super::decode("0.4e15").unwrap();
2995 assert_eq!(v, 0.4e15);
2997 let v: f64 = super::decode("0.4e-01").unwrap();
2998 assert_eq!(v, 0.4e-01);
3000 let v: u64 = super::decode("0").unwrap();
3003 let v: u64 = super::decode("18446744073709551615").unwrap();
3004 assert_eq!(v, u64::MAX);
3006 let v: i64 = super::decode("-9223372036854775808").unwrap();
3007 assert_eq!(v, i64::MIN);
3009 let v: i64 = super::decode("9223372036854775807").unwrap();
3010 assert_eq!(v, i64::MAX);
3012 let res: DecodeResult<i64> = super::decode("765.25");
3013 assert_eq!(res, Err(ExpectedError("Integer".to_string(),
3014 "765.25".to_string())));
3018 fn test_read_str() {
3019 assert_eq!(from_str("\""), Err(SyntaxError(EOFWhileParsingString, 1, 2)));
3020 assert_eq!(from_str("\"lol"), Err(SyntaxError(EOFWhileParsingString, 1, 5)));
3022 assert_eq!(from_str("\"\""), Ok(String("".to_string())));
3023 assert_eq!(from_str("\"foo\""), Ok(String("foo".to_string())));
3024 assert_eq!(from_str("\"\\\"\""), Ok(String("\"".to_string())));
3025 assert_eq!(from_str("\"\\b\""), Ok(String("\x08".to_string())));
3026 assert_eq!(from_str("\"\\n\""), Ok(String("\n".to_string())));
3027 assert_eq!(from_str("\"\\r\""), Ok(String("\r".to_string())));
3028 assert_eq!(from_str("\"\\t\""), Ok(String("\t".to_string())));
3029 assert_eq!(from_str(" \"foo\" "), Ok(String("foo".to_string())));
3030 assert_eq!(from_str("\"\\u12ab\""), Ok(String("\u{12ab}".to_string())));
3031 assert_eq!(from_str("\"\\uAB12\""), Ok(String("\u{AB12}".to_string())));
3035 fn test_decode_str() {
3036 let s = [("\"\"", ""),
3039 ("\"\\b\"", "\x08"),
3043 ("\"\\u12ab\"", "\u{12ab}"),
3044 ("\"\\uAB12\"", "\u{AB12}")];
3047 let v: string::String = super::decode(i).unwrap();
3053 fn test_read_array() {
3054 assert_eq!(from_str("["), Err(SyntaxError(EOFWhileParsingValue, 1, 2)));
3055 assert_eq!(from_str("[1"), Err(SyntaxError(EOFWhileParsingArray, 1, 3)));
3056 assert_eq!(from_str("[1,"), Err(SyntaxError(EOFWhileParsingValue, 1, 4)));
3057 assert_eq!(from_str("[1,]"), Err(SyntaxError(InvalidSyntax, 1, 4)));
3058 assert_eq!(from_str("[6 7]"), Err(SyntaxError(InvalidSyntax, 1, 4)));
3060 assert_eq!(from_str("[]"), Ok(Array(vec![])));
3061 assert_eq!(from_str("[ ]"), Ok(Array(vec![])));
3062 assert_eq!(from_str("[true]"), Ok(Array(vec![Boolean(true)])));
3063 assert_eq!(from_str("[ false ]"), Ok(Array(vec![Boolean(false)])));
3064 assert_eq!(from_str("[null]"), Ok(Array(vec![Null])));
3065 assert_eq!(from_str("[3, 1]"),
3066 Ok(Array(vec![U64(3), U64(1)])));
3067 assert_eq!(from_str("\n[3, 2]\n"),
3068 Ok(Array(vec![U64(3), U64(2)])));
3069 assert_eq!(from_str("[2, [4, 1]]"),
3070 Ok(Array(vec![U64(2), Array(vec![U64(4), U64(1)])])));
3074 fn test_decode_array() {
3075 let v: Vec<()> = super::decode("[]").unwrap();
3078 let v: Vec<()> = super::decode("[null]").unwrap();
3079 assert_eq!(v, [()]);
3081 let v: Vec<bool> = super::decode("[true]").unwrap();
3082 assert_eq!(v, [true]);
3084 let v: Vec<isize> = super::decode("[3, 1]").unwrap();
3085 assert_eq!(v, [3, 1]);
3087 let v: Vec<Vec<usize>> = super::decode("[[3], [1, 2]]").unwrap();
3088 assert_eq!(v, [vec![3], vec![1, 2]]);
3092 fn test_decode_tuple() {
3093 let t: (usize, usize, usize) = super::decode("[1, 2, 3]").unwrap();
3094 assert_eq!(t, (1, 2, 3));
3096 let t: (usize, string::String) = super::decode("[1, \"two\"]").unwrap();
3097 assert_eq!(t, (1, "two".to_string()));
3101 fn test_decode_tuple_malformed_types() {
3102 assert!(super::decode::<(usize, string::String)>("[1, 2]").is_err());
3106 fn test_decode_tuple_malformed_length() {
3107 assert!(super::decode::<(usize, usize)>("[1, 2, 3]").is_err());
3111 fn test_read_object() {
3112 assert_eq!(from_str("{"), Err(SyntaxError(EOFWhileParsingObject, 1, 2)));
3113 assert_eq!(from_str("{ "), Err(SyntaxError(EOFWhileParsingObject, 1, 3)));
3114 assert_eq!(from_str("{1"), Err(SyntaxError(KeyMustBeAString, 1, 2)));
3115 assert_eq!(from_str("{ \"a\""), Err(SyntaxError(EOFWhileParsingObject, 1, 6)));
3116 assert_eq!(from_str("{\"a\""), Err(SyntaxError(EOFWhileParsingObject, 1, 5)));
3117 assert_eq!(from_str("{\"a\" "), Err(SyntaxError(EOFWhileParsingObject, 1, 6)));
3119 assert_eq!(from_str("{\"a\" 1"), Err(SyntaxError(ExpectedColon, 1, 6)));
3120 assert_eq!(from_str("{\"a\":"), Err(SyntaxError(EOFWhileParsingValue, 1, 6)));
3121 assert_eq!(from_str("{\"a\":1"), Err(SyntaxError(EOFWhileParsingObject, 1, 7)));
3122 assert_eq!(from_str("{\"a\":1 1"), Err(SyntaxError(InvalidSyntax, 1, 8)));
3123 assert_eq!(from_str("{\"a\":1,"), Err(SyntaxError(EOFWhileParsingObject, 1, 8)));
3125 assert_eq!(from_str("{}").unwrap(), mk_object(&[]));
3126 assert_eq!(from_str("{\"a\": 3}").unwrap(),
3127 mk_object(&[("a".to_string(), U64(3))]));
3129 assert_eq!(from_str(
3130 "{ \"a\": null, \"b\" : true }").unwrap(),
3132 ("a".to_string(), Null),
3133 ("b".to_string(), Boolean(true))]));
3134 assert_eq!(from_str("\n{ \"a\": null, \"b\" : true }\n").unwrap(),
3136 ("a".to_string(), Null),
3137 ("b".to_string(), Boolean(true))]));
3138 assert_eq!(from_str(
3139 "{\"a\" : 1.0 ,\"b\": [ true ]}").unwrap(),
3141 ("a".to_string(), F64(1.0)),
3142 ("b".to_string(), Array(vec![Boolean(true)]))
3144 assert_eq!(from_str(
3150 { \"c\": {\"d\": null} } \
3154 ("a".to_string(), F64(1.0)),
3155 ("b".to_string(), Array(vec![
3157 String("foo\nbar".to_string()),
3159 ("c".to_string(), mk_object(&[("d".to_string(), Null)]))
3166 fn test_decode_struct() {
3169 { \"a\": null, \"b\": 2, \"c\": [\"abc\", \"xyz\"] }
3173 let v: Outer = super::decode(s).unwrap();
3178 Inner { a: (), b: 2, c: vec!["abc".to_string(), "xyz".to_string()] }
3184 #[derive(RustcDecodable)]
3185 struct FloatStruct {
3190 fn test_decode_struct_with_nan() {
3191 let s = "{\"f\":null,\"a\":[null,123]}";
3192 let obj: FloatStruct = super::decode(s).unwrap();
3193 assert!(obj.f.is_nan());
3194 assert!(obj.a[0].is_nan());
3195 assert_eq!(obj.a[1], 123f64);
3199 fn test_decode_option() {
3200 let value: Option<string::String> = super::decode("null").unwrap();
3201 assert_eq!(value, None);
3203 let value: Option<string::String> = super::decode("\"jodhpurs\"").unwrap();
3204 assert_eq!(value, Some("jodhpurs".to_string()));
3208 fn test_decode_enum() {
3209 let value: Animal = super::decode("\"Dog\"").unwrap();
3210 assert_eq!(value, Dog);
3212 let s = "{\"variant\":\"Frog\",\"fields\":[\"Henry\",349]}";
3213 let value: Animal = super::decode(s).unwrap();
3214 assert_eq!(value, Frog("Henry".to_string(), 349));
3218 fn test_decode_map() {
3219 let s = "{\"a\": \"Dog\", \"b\": {\"variant\":\"Frog\",\
3220 \"fields\":[\"Henry\", 349]}}";
3221 let mut map: BTreeMap<string::String, Animal> = super::decode(s).unwrap();
3223 assert_eq!(map.remove(&"a".to_string()), Some(Dog));
3224 assert_eq!(map.remove(&"b".to_string()), Some(Frog("Henry".to_string(), 349)));
3228 fn test_multiline_errors() {
3229 assert_eq!(from_str("{\n \"foo\":\n \"bar\""),
3230 Err(SyntaxError(EOFWhileParsingObject, 3, 8)));
3233 #[derive(RustcDecodable)]
3235 struct DecodeStruct {
3239 w: Vec<DecodeStruct>
3241 #[derive(RustcDecodable)]
3246 fn check_err<T: Decodable>(to_parse: &'static str, expected: DecoderError) {
3247 let res: DecodeResult<T> = match from_str(to_parse) {
3248 Err(e) => Err(ParseError(e)),
3249 Ok(json) => Decodable::decode(&mut Decoder::new(json))
3252 Ok(_) => panic!("`{:?}` parsed & decoded ok, expecting error `{:?}`",
3253 to_parse, expected),
3254 Err(ParseError(e)) => panic!("`{:?}` is not valid json: {:?}",
3257 assert_eq!(e, expected);
3262 fn test_decode_errors_struct() {
3263 check_err::<DecodeStruct>("[]", ExpectedError("Object".to_string(), "[]".to_string()));
3264 check_err::<DecodeStruct>("{\"x\": true, \"y\": true, \"z\": \"\", \"w\": []}",
3265 ExpectedError("Number".to_string(), "true".to_string()));
3266 check_err::<DecodeStruct>("{\"x\": 1, \"y\": [], \"z\": \"\", \"w\": []}",
3267 ExpectedError("Boolean".to_string(), "[]".to_string()));
3268 check_err::<DecodeStruct>("{\"x\": 1, \"y\": true, \"z\": {}, \"w\": []}",
3269 ExpectedError("String".to_string(), "{}".to_string()));
3270 check_err::<DecodeStruct>("{\"x\": 1, \"y\": true, \"z\": \"\", \"w\": null}",
3271 ExpectedError("Array".to_string(), "null".to_string()));
3272 check_err::<DecodeStruct>("{\"x\": 1, \"y\": true, \"z\": \"\"}",
3273 MissingFieldError("w".to_string()));
3276 fn test_decode_errors_enum() {
3277 check_err::<DecodeEnum>("{}",
3278 MissingFieldError("variant".to_string()));
3279 check_err::<DecodeEnum>("{\"variant\": 1}",
3280 ExpectedError("String".to_string(), "1".to_string()));
3281 check_err::<DecodeEnum>("{\"variant\": \"A\"}",
3282 MissingFieldError("fields".to_string()));
3283 check_err::<DecodeEnum>("{\"variant\": \"A\", \"fields\": null}",
3284 ExpectedError("Array".to_string(), "null".to_string()));
3285 check_err::<DecodeEnum>("{\"variant\": \"C\", \"fields\": []}",
3286 UnknownVariantError("C".to_string()));
3291 let json_value = from_str("{\"dog\" : \"cat\"}").unwrap();
3292 let found_str = json_value.find("dog");
3293 assert!(found_str.unwrap().as_string().unwrap() == "cat");
3297 fn test_find_path(){
3298 let json_value = from_str("{\"dog\":{\"cat\": {\"mouse\" : \"cheese\"}}}").unwrap();
3299 let found_str = json_value.find_path(&["dog", "cat", "mouse"]);
3300 assert!(found_str.unwrap().as_string().unwrap() == "cheese");
3305 let json_value = from_str("{\"dog\":{\"cat\": {\"mouse\" : \"cheese\"}}}").unwrap();
3306 let found_str = json_value.search("mouse").and_then(|j| j.as_string());
3307 assert!(found_str.unwrap() == "cheese");
3312 let json_value = from_str("{\"animals\":[\"dog\",\"cat\",\"mouse\"]}").unwrap();
3313 let ref array = json_value["animals"];
3314 assert_eq!(array[0].as_string().unwrap(), "dog");
3315 assert_eq!(array[1].as_string().unwrap(), "cat");
3316 assert_eq!(array[2].as_string().unwrap(), "mouse");
3320 fn test_is_object(){
3321 let json_value = from_str("{}").unwrap();
3322 assert!(json_value.is_object());
3326 fn test_as_object(){
3327 let json_value = from_str("{}").unwrap();
3328 let json_object = json_value.as_object();
3329 assert!(json_object.is_some());
3334 let json_value = from_str("[1, 2, 3]").unwrap();
3335 assert!(json_value.is_array());
3340 let json_value = from_str("[1, 2, 3]").unwrap();
3341 let json_array = json_value.as_array();
3342 let expected_length = 3;
3343 assert!(json_array.is_some() && json_array.unwrap().len() == expected_length);
3347 fn test_is_string(){
3348 let json_value = from_str("\"dog\"").unwrap();
3349 assert!(json_value.is_string());
3353 fn test_as_string(){
3354 let json_value = from_str("\"dog\"").unwrap();
3355 let json_str = json_value.as_string();
3356 let expected_str = "dog";
3357 assert_eq!(json_str, Some(expected_str));
3361 fn test_is_number(){
3362 let json_value = from_str("12").unwrap();
3363 assert!(json_value.is_number());
3368 let json_value = from_str("-12").unwrap();
3369 assert!(json_value.is_i64());
3371 let json_value = from_str("12").unwrap();
3372 assert!(!json_value.is_i64());
3374 let json_value = from_str("12.0").unwrap();
3375 assert!(!json_value.is_i64());
3380 let json_value = from_str("12").unwrap();
3381 assert!(json_value.is_u64());
3383 let json_value = from_str("-12").unwrap();
3384 assert!(!json_value.is_u64());
3386 let json_value = from_str("12.0").unwrap();
3387 assert!(!json_value.is_u64());
3392 let json_value = from_str("12").unwrap();
3393 assert!(!json_value.is_f64());
3395 let json_value = from_str("-12").unwrap();
3396 assert!(!json_value.is_f64());
3398 let json_value = from_str("12.0").unwrap();
3399 assert!(json_value.is_f64());
3401 let json_value = from_str("-12.0").unwrap();
3402 assert!(json_value.is_f64());
3407 let json_value = from_str("-12").unwrap();
3408 let json_num = json_value.as_i64();
3409 assert_eq!(json_num, Some(-12));
3414 let json_value = from_str("12").unwrap();
3415 let json_num = json_value.as_u64();
3416 assert_eq!(json_num, Some(12));
3421 let json_value = from_str("12.0").unwrap();
3422 let json_num = json_value.as_f64();
3423 assert_eq!(json_num, Some(12f64));
3427 fn test_is_boolean(){
3428 let json_value = from_str("false").unwrap();
3429 assert!(json_value.is_boolean());
3433 fn test_as_boolean(){
3434 let json_value = from_str("false").unwrap();
3435 let json_bool = json_value.as_boolean();
3436 let expected_bool = false;
3437 assert!(json_bool.is_some() && json_bool.unwrap() == expected_bool);
3442 let json_value = from_str("null").unwrap();
3443 assert!(json_value.is_null());
3448 let json_value = from_str("null").unwrap();
3449 let json_null = json_value.as_null();
3450 let expected_null = ();
3451 assert!(json_null.is_some() && json_null.unwrap() == expected_null);
3455 fn test_encode_hashmap_with_numeric_key() {
3456 use std::str::from_utf8;
3457 use std::collections::HashMap;
3458 let mut hm: HashMap<usize, bool> = HashMap::new();
3460 let mut mem_buf = Vec::new();
3461 write!(&mut mem_buf, "{}", super::as_pretty_json(&hm)).unwrap();
3462 let json_str = from_utf8(&mem_buf[..]).unwrap();
3463 match from_str(json_str) {
3464 Err(_) => panic!("Unable to parse json_str: {:?}", json_str),
3465 _ => {} // it parsed and we are good to go
3470 fn test_prettyencode_hashmap_with_numeric_key() {
3471 use std::str::from_utf8;
3472 use std::collections::HashMap;
3473 let mut hm: HashMap<usize, bool> = HashMap::new();
3475 let mut mem_buf = Vec::new();
3476 write!(&mut mem_buf, "{}", super::as_pretty_json(&hm)).unwrap();
3477 let json_str = from_utf8(&mem_buf[..]).unwrap();
3478 match from_str(json_str) {
3479 Err(_) => panic!("Unable to parse json_str: {:?}", json_str),
3480 _ => {} // it parsed and we are good to go
3485 fn test_prettyencoder_indent_level_param() {
3486 use std::str::from_utf8;
3487 use std::collections::BTreeMap;
3489 let mut tree = BTreeMap::new();
3491 tree.insert("hello".to_string(), String("guten tag".to_string()));
3492 tree.insert("goodbye".to_string(), String("sayonara".to_string()));
3495 // The following layout below should look a lot like
3496 // the pretty-printed JSON (indent * x)
3499 String("greetings".to_string()), // 1x
3500 Object(tree), // 1x + 2x + 2x + 1x
3502 // End JSON array (7 lines)
3505 // Helper function for counting indents
3506 fn indents(source: &str) -> usize {
3507 let trimmed = source.trim_left_matches(' ');
3508 source.len() - trimmed.len()
3511 // Test up to 4 spaces of indents (more?)
3513 let mut writer = Vec::new();
3514 write!(&mut writer, "{}",
3515 super::as_pretty_json(&json).indent(i)).unwrap();
3517 let printed = from_utf8(&writer[..]).unwrap();
3519 // Check for indents at each line
3520 let lines: Vec<&str> = printed.lines().collect();
3521 assert_eq!(lines.len(), 7); // JSON should be 7 lines
3523 assert_eq!(indents(lines[0]), 0 * i); // [
3524 assert_eq!(indents(lines[1]), 1 * i); // "greetings",
3525 assert_eq!(indents(lines[2]), 1 * i); // {
3526 assert_eq!(indents(lines[3]), 2 * i); // "hello": "guten tag",
3527 assert_eq!(indents(lines[4]), 2 * i); // "goodbye": "sayonara"
3528 assert_eq!(indents(lines[5]), 1 * i); // },
3529 assert_eq!(indents(lines[6]), 0 * i); // ]
3531 // Finally, test that the pretty-printed JSON is valid
3532 from_str(printed).ok().expect("Pretty-printed JSON is invalid!");
3537 fn test_hashmap_with_enum_key() {
3538 use std::collections::HashMap;
3540 #[derive(RustcEncodable, Eq, Hash, PartialEq, RustcDecodable, Debug)]
3546 let mut map = HashMap::new();
3547 map.insert(Enum::Foo, 0);
3548 let result = json::encode(&map).unwrap();
3549 assert_eq!(&result[..], r#"{"Foo":0}"#);
3550 let decoded: HashMap<Enum, _> = json::decode(&result).unwrap();
3551 assert_eq!(map, decoded);
3555 fn test_hashmap_with_numeric_key_can_handle_double_quote_delimited_key() {
3556 use std::collections::HashMap;
3558 let json_str = "{\"1\":true}";
3559 let json_obj = match from_str(json_str) {
3560 Err(_) => panic!("Unable to parse json_str: {:?}", json_str),
3563 let mut decoder = Decoder::new(json_obj);
3564 let _hm: HashMap<usize, bool> = Decodable::decode(&mut decoder).unwrap();
3568 fn test_hashmap_with_numeric_key_will_error_with_string_keys() {
3569 use std::collections::HashMap;
3571 let json_str = "{\"a\":true}";
3572 let json_obj = match from_str(json_str) {
3573 Err(_) => panic!("Unable to parse json_str: {:?}", json_str),
3576 let mut decoder = Decoder::new(json_obj);
3577 let result: Result<HashMap<usize, bool>, DecoderError> = Decodable::decode(&mut decoder);
3578 assert_eq!(result, Err(ExpectedError("Number".to_string(), "a".to_string())));
3581 fn assert_stream_equal(src: &str,
3582 expected: Vec<(JsonEvent, Vec<StackElement>)>) {
3583 let mut parser = Parser::new(src.chars());
3586 let evt = match parser.next() {
3590 let (ref expected_evt, ref expected_stack) = expected[i];
3591 if !parser.stack().is_equal_to(expected_stack) {
3592 panic!("Parser stack is not equal to {:?}", expected_stack);
3594 assert_eq!(&evt, expected_evt);
3599 #[cfg_attr(target_pointer_width = "32", ignore)] // FIXME(#14064)
3600 fn test_streaming_parser() {
3601 assert_stream_equal(
3602 r#"{ "foo":"bar", "array" : [0, 1, 2, 3, 4, 5], "idents":[null,true,false]}"#,
3604 (ObjectStart, vec![]),
3605 (StringValue("bar".to_string()), vec![StackElement::Key("foo")]),
3606 (ArrayStart, vec![StackElement::Key("array")]),
3607 (U64Value(0), vec![StackElement::Key("array"), StackElement::Index(0)]),
3608 (U64Value(1), vec![StackElement::Key("array"), StackElement::Index(1)]),
3609 (U64Value(2), vec![StackElement::Key("array"), StackElement::Index(2)]),
3610 (U64Value(3), vec![StackElement::Key("array"), StackElement::Index(3)]),
3611 (U64Value(4), vec![StackElement::Key("array"), StackElement::Index(4)]),
3612 (U64Value(5), vec![StackElement::Key("array"), StackElement::Index(5)]),
3613 (ArrayEnd, vec![StackElement::Key("array")]),
3614 (ArrayStart, vec![StackElement::Key("idents")]),
3615 (NullValue, vec![StackElement::Key("idents"),
3616 StackElement::Index(0)]),
3617 (BooleanValue(true), vec![StackElement::Key("idents"),
3618 StackElement::Index(1)]),
3619 (BooleanValue(false), vec![StackElement::Key("idents"),
3620 StackElement::Index(2)]),
3621 (ArrayEnd, vec![StackElement::Key("idents")]),
3622 (ObjectEnd, vec![]),
3626 fn last_event(src: &str) -> JsonEvent {
3627 let mut parser = Parser::new(src.chars());
3628 let mut evt = NullValue;
3630 evt = match parser.next() {
3638 #[cfg_attr(target_pointer_width = "32", ignore)] // FIXME(#14064)
3639 fn test_read_object_streaming() {
3640 assert_eq!(last_event("{ "), Error(SyntaxError(EOFWhileParsingObject, 1, 3)));
3641 assert_eq!(last_event("{1"), Error(SyntaxError(KeyMustBeAString, 1, 2)));
3642 assert_eq!(last_event("{ \"a\""), Error(SyntaxError(EOFWhileParsingObject, 1, 6)));
3643 assert_eq!(last_event("{\"a\""), Error(SyntaxError(EOFWhileParsingObject, 1, 5)));
3644 assert_eq!(last_event("{\"a\" "), Error(SyntaxError(EOFWhileParsingObject, 1, 6)));
3646 assert_eq!(last_event("{\"a\" 1"), Error(SyntaxError(ExpectedColon, 1, 6)));
3647 assert_eq!(last_event("{\"a\":"), Error(SyntaxError(EOFWhileParsingValue, 1, 6)));
3648 assert_eq!(last_event("{\"a\":1"), Error(SyntaxError(EOFWhileParsingObject, 1, 7)));
3649 assert_eq!(last_event("{\"a\":1 1"), Error(SyntaxError(InvalidSyntax, 1, 8)));
3650 assert_eq!(last_event("{\"a\":1,"), Error(SyntaxError(EOFWhileParsingObject, 1, 8)));
3651 assert_eq!(last_event("{\"a\":1,}"), Error(SyntaxError(TrailingComma, 1, 8)));
3653 assert_stream_equal(
3655 vec![(ObjectStart, vec![]), (ObjectEnd, vec![])]
3657 assert_stream_equal(
3660 (ObjectStart, vec![]),
3661 (U64Value(3), vec![StackElement::Key("a")]),
3662 (ObjectEnd, vec![]),
3665 assert_stream_equal(
3666 "{ \"a\": null, \"b\" : true }",
3668 (ObjectStart, vec![]),
3669 (NullValue, vec![StackElement::Key("a")]),
3670 (BooleanValue(true), vec![StackElement::Key("b")]),
3671 (ObjectEnd, vec![]),
3674 assert_stream_equal(
3675 "{\"a\" : 1.0 ,\"b\": [ true ]}",
3677 (ObjectStart, vec![]),
3678 (F64Value(1.0), vec![StackElement::Key("a")]),
3679 (ArrayStart, vec![StackElement::Key("b")]),
3680 (BooleanValue(true),vec![StackElement::Key("b"), StackElement::Index(0)]),
3681 (ArrayEnd, vec![StackElement::Key("b")]),
3682 (ObjectEnd, vec![]),
3685 assert_stream_equal(
3691 { "c": {"d": null} }
3695 (ObjectStart, vec![]),
3696 (F64Value(1.0), vec![StackElement::Key("a")]),
3697 (ArrayStart, vec![StackElement::Key("b")]),
3698 (BooleanValue(true), vec![StackElement::Key("b"),
3699 StackElement::Index(0)]),
3700 (StringValue("foo\nbar".to_string()), vec![StackElement::Key("b"),
3701 StackElement::Index(1)]),
3702 (ObjectStart, vec![StackElement::Key("b"),
3703 StackElement::Index(2)]),
3704 (ObjectStart, vec![StackElement::Key("b"),
3705 StackElement::Index(2),
3706 StackElement::Key("c")]),
3707 (NullValue, vec![StackElement::Key("b"),
3708 StackElement::Index(2),
3709 StackElement::Key("c"),
3710 StackElement::Key("d")]),
3711 (ObjectEnd, vec![StackElement::Key("b"),
3712 StackElement::Index(2),
3713 StackElement::Key("c")]),
3714 (ObjectEnd, vec![StackElement::Key("b"),
3715 StackElement::Index(2)]),
3716 (ArrayEnd, vec![StackElement::Key("b")]),
3717 (ObjectEnd, vec![]),
3722 #[cfg_attr(target_pointer_width = "32", ignore)] // FIXME(#14064)
3723 fn test_read_array_streaming() {
3724 assert_stream_equal(
3727 (ArrayStart, vec![]),
3731 assert_stream_equal(
3734 (ArrayStart, vec![]),
3738 assert_stream_equal(
3741 (ArrayStart, vec![]),
3742 (BooleanValue(true), vec![StackElement::Index(0)]),
3746 assert_stream_equal(
3749 (ArrayStart, vec![]),
3750 (BooleanValue(false), vec![StackElement::Index(0)]),
3754 assert_stream_equal(
3757 (ArrayStart, vec![]),
3758 (NullValue, vec![StackElement::Index(0)]),
3762 assert_stream_equal(
3765 (ArrayStart, vec![]),
3766 (U64Value(3), vec![StackElement::Index(0)]),
3767 (U64Value(1), vec![StackElement::Index(1)]),
3771 assert_stream_equal(
3774 (ArrayStart, vec![]),
3775 (U64Value(3), vec![StackElement::Index(0)]),
3776 (U64Value(2), vec![StackElement::Index(1)]),
3780 assert_stream_equal(
3783 (ArrayStart, vec![]),
3784 (U64Value(2), vec![StackElement::Index(0)]),
3785 (ArrayStart, vec![StackElement::Index(1)]),
3786 (U64Value(4), vec![StackElement::Index(1), StackElement::Index(0)]),
3787 (U64Value(1), vec![StackElement::Index(1), StackElement::Index(1)]),
3788 (ArrayEnd, vec![StackElement::Index(1)]),
3793 assert_eq!(last_event("["), Error(SyntaxError(EOFWhileParsingValue, 1, 2)));
3795 assert_eq!(from_str("["), Err(SyntaxError(EOFWhileParsingValue, 1, 2)));
3796 assert_eq!(from_str("[1"), Err(SyntaxError(EOFWhileParsingArray, 1, 3)));
3797 assert_eq!(from_str("[1,"), Err(SyntaxError(EOFWhileParsingValue, 1, 4)));
3798 assert_eq!(from_str("[1,]"), Err(SyntaxError(InvalidSyntax, 1, 4)));
3799 assert_eq!(from_str("[6 7]"), Err(SyntaxError(InvalidSyntax, 1, 4)));
3803 fn test_trailing_characters_streaming() {
3804 assert_eq!(last_event("nulla"), Error(SyntaxError(TrailingCharacters, 1, 5)));
3805 assert_eq!(last_event("truea"), Error(SyntaxError(TrailingCharacters, 1, 5)));
3806 assert_eq!(last_event("falsea"), Error(SyntaxError(TrailingCharacters, 1, 6)));
3807 assert_eq!(last_event("1a"), Error(SyntaxError(TrailingCharacters, 1, 2)));
3808 assert_eq!(last_event("[]a"), Error(SyntaxError(TrailingCharacters, 1, 3)));
3809 assert_eq!(last_event("{}a"), Error(SyntaxError(TrailingCharacters, 1, 3)));
3812 fn test_read_identifiers_streaming() {
3813 assert_eq!(Parser::new("null".chars()).next(), Some(NullValue));
3814 assert_eq!(Parser::new("true".chars()).next(), Some(BooleanValue(true)));
3815 assert_eq!(Parser::new("false".chars()).next(), Some(BooleanValue(false)));
3817 assert_eq!(last_event("n"), Error(SyntaxError(InvalidSyntax, 1, 2)));
3818 assert_eq!(last_event("nul"), Error(SyntaxError(InvalidSyntax, 1, 4)));
3819 assert_eq!(last_event("t"), Error(SyntaxError(InvalidSyntax, 1, 2)));
3820 assert_eq!(last_event("truz"), Error(SyntaxError(InvalidSyntax, 1, 4)));
3821 assert_eq!(last_event("f"), Error(SyntaxError(InvalidSyntax, 1, 2)));
3822 assert_eq!(last_event("faz"), Error(SyntaxError(InvalidSyntax, 1, 3)));
3827 let mut stack = Stack::new();
3829 assert!(stack.is_empty());
3830 assert!(stack.is_empty());
3831 assert!(!stack.last_is_index());
3833 stack.push_index(0);
3836 assert!(stack.len() == 1);
3837 assert!(stack.is_equal_to(&[StackElement::Index(1)]));
3838 assert!(stack.starts_with(&[StackElement::Index(1)]));
3839 assert!(stack.ends_with(&[StackElement::Index(1)]));
3840 assert!(stack.last_is_index());
3841 assert!(stack.get(0) == StackElement::Index(1));
3843 stack.push_key("foo".to_string());
3845 assert!(stack.len() == 2);
3846 assert!(stack.is_equal_to(&[StackElement::Index(1), StackElement::Key("foo")]));
3847 assert!(stack.starts_with(&[StackElement::Index(1), StackElement::Key("foo")]));
3848 assert!(stack.starts_with(&[StackElement::Index(1)]));
3849 assert!(stack.ends_with(&[StackElement::Index(1), StackElement::Key("foo")]));
3850 assert!(stack.ends_with(&[StackElement::Key("foo")]));
3851 assert!(!stack.last_is_index());
3852 assert!(stack.get(0) == StackElement::Index(1));
3853 assert!(stack.get(1) == StackElement::Key("foo"));
3855 stack.push_key("bar".to_string());
3857 assert!(stack.len() == 3);
3858 assert!(stack.is_equal_to(&[StackElement::Index(1),
3859 StackElement::Key("foo"),
3860 StackElement::Key("bar")]));
3861 assert!(stack.starts_with(&[StackElement::Index(1)]));
3862 assert!(stack.starts_with(&[StackElement::Index(1), StackElement::Key("foo")]));
3863 assert!(stack.starts_with(&[StackElement::Index(1),
3864 StackElement::Key("foo"),
3865 StackElement::Key("bar")]));
3866 assert!(stack.ends_with(&[StackElement::Key("bar")]));
3867 assert!(stack.ends_with(&[StackElement::Key("foo"), StackElement::Key("bar")]));
3868 assert!(stack.ends_with(&[StackElement::Index(1),
3869 StackElement::Key("foo"),
3870 StackElement::Key("bar")]));
3871 assert!(!stack.last_is_index());
3872 assert!(stack.get(0) == StackElement::Index(1));
3873 assert!(stack.get(1) == StackElement::Key("foo"));
3874 assert!(stack.get(2) == StackElement::Key("bar"));
3878 assert!(stack.len() == 2);
3879 assert!(stack.is_equal_to(&[StackElement::Index(1), StackElement::Key("foo")]));
3880 assert!(stack.starts_with(&[StackElement::Index(1), StackElement::Key("foo")]));
3881 assert!(stack.starts_with(&[StackElement::Index(1)]));
3882 assert!(stack.ends_with(&[StackElement::Index(1), StackElement::Key("foo")]));
3883 assert!(stack.ends_with(&[StackElement::Key("foo")]));
3884 assert!(!stack.last_is_index());
3885 assert!(stack.get(0) == StackElement::Index(1));
3886 assert!(stack.get(1) == StackElement::Key("foo"));
3891 use std::collections::{HashMap,BTreeMap};
3894 let array2 = Array(vec!(U64(1), U64(2)));
3895 let array3 = Array(vec!(U64(1), U64(2), U64(3)));
3897 let mut tree_map = BTreeMap::new();
3898 tree_map.insert("a".to_string(), U64(1));
3899 tree_map.insert("b".to_string(), U64(2));
3903 assert_eq!(array2.to_json(), array2);
3904 assert_eq!(object.to_json(), object);
3905 assert_eq!(3_isize.to_json(), I64(3));
3906 assert_eq!(4_i8.to_json(), I64(4));
3907 assert_eq!(5_i16.to_json(), I64(5));
3908 assert_eq!(6_i32.to_json(), I64(6));
3909 assert_eq!(7_i64.to_json(), I64(7));
3910 assert_eq!(8_usize.to_json(), U64(8));
3911 assert_eq!(9_u8.to_json(), U64(9));
3912 assert_eq!(10_u16.to_json(), U64(10));
3913 assert_eq!(11_u32.to_json(), U64(11));
3914 assert_eq!(12_u64.to_json(), U64(12));
3915 assert_eq!(13.0_f32.to_json(), F64(13.0_f64));
3916 assert_eq!(14.0_f64.to_json(), F64(14.0_f64));
3917 assert_eq!(().to_json(), Null);
3918 assert_eq!(f32::INFINITY.to_json(), Null);
3919 assert_eq!(f64::NAN.to_json(), Null);
3920 assert_eq!(true.to_json(), Boolean(true));
3921 assert_eq!(false.to_json(), Boolean(false));
3922 assert_eq!("abc".to_json(), String("abc".to_string()));
3923 assert_eq!("abc".to_string().to_json(), String("abc".to_string()));
3924 assert_eq!((1_usize, 2_usize).to_json(), array2);
3925 assert_eq!((1_usize, 2_usize, 3_usize).to_json(), array3);
3926 assert_eq!([1_usize, 2_usize].to_json(), array2);
3927 assert_eq!((&[1_usize, 2_usize, 3_usize]).to_json(), array3);
3928 assert_eq!((vec![1_usize, 2_usize]).to_json(), array2);
3929 assert_eq!(vec!(1_usize, 2_usize, 3_usize).to_json(), array3);
3930 let mut tree_map = BTreeMap::new();
3931 tree_map.insert("a".to_string(), 1 as usize);
3932 tree_map.insert("b".to_string(), 2);
3933 assert_eq!(tree_map.to_json(), object);
3934 let mut hash_map = HashMap::new();
3935 hash_map.insert("a".to_string(), 1 as usize);
3936 hash_map.insert("b".to_string(), 2);
3937 assert_eq!(hash_map.to_json(), object);
3938 assert_eq!(Some(15).to_json(), I64(15));
3939 assert_eq!(Some(15 as usize).to_json(), U64(15));
3940 assert_eq!(None::<isize>.to_json(), Null);
3944 fn test_encode_hashmap_with_arbitrary_key() {
3945 use std::collections::HashMap;
3946 #[derive(PartialEq, Eq, Hash, RustcEncodable)]
3947 struct ArbitraryType(usize);
3948 let mut hm: HashMap<ArbitraryType, bool> = HashMap::new();
3949 hm.insert(ArbitraryType(1), true);
3950 let mut mem_buf = string::String::new();
3951 let mut encoder = Encoder::new(&mut mem_buf);
3952 let result = hm.encode(&mut encoder);
3953 match result.err().unwrap() {
3954 EncoderError::BadHashmapKey => (),
3955 _ => panic!("expected bad hash map key")
3960 fn bench_streaming_small(b: &mut Bencher) {
3962 let mut parser = Parser::new(
3968 { "c": {"d": null} }
3973 match parser.next() {
3981 fn bench_small(b: &mut Bencher) {
3983 let _ = from_str(r#"{
3988 { "c": {"d": null} }
3994 fn big_json() -> string::String {
3995 let mut src = "[\n".to_string();
3997 src.push_str(r#"{ "a": true, "b": null, "c":3.1415, "d": "Hello world", "e": \
4000 src.push_str("{}]");
4005 fn bench_streaming_large(b: &mut Bencher) {
4006 let src = big_json();
4008 let mut parser = Parser::new(src.chars());
4010 match parser.next() {
4018 fn bench_large(b: &mut Bencher) {
4019 let src = big_json();
4020 b.iter( || { let _ = from_str(&src); });