1 // Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 // Rust JSON serialization library
12 // Copyright (c) 2011 Google Inc.
14 #![forbid(non_camel_case_types)]
15 #![allow(missing_docs)]
17 //! JSON parsing and serialization
21 //! JSON (JavaScript Object Notation) is a way to write data in Javascript.
22 //! Like XML, it allows to encode structured data in a text format that can be easily read by humans
23 //! Its simple syntax and native compatibility with JavaScript have made it a widely used format.
25 //! Data types that can be encoded are JavaScript types (see the `Json` enum for more details):
27 //! * `Boolean`: equivalent to rust's `bool`
28 //! * `Number`: equivalent to rust's `f64`
29 //! * `String`: equivalent to rust's `String`
30 //! * `Array`: equivalent to rust's `Vec<T>`, but also allowing objects of different types in the
32 //! * `Object`: equivalent to rust's `BTreeMap<String, json::Json>`
35 //! An object is a series of string keys mapping to values, in `"key": value` format.
36 //! Arrays are enclosed in square brackets ([ ... ]) and objects in curly brackets ({ ... }).
37 //! A simple JSON document encoding a person, their age, address and phone numbers could look like
41 //! "FirstName": "John",
42 //! "LastName": "Doe",
45 //! "Street": "Downing Street 10",
47 //! "Country": "Great Britain"
56 //! # Rust Type-based Encoding and Decoding
58 //! Rust provides a mechanism for low boilerplate encoding & decoding of values to and from JSON via
59 //! the serialization API.
60 //! To be able to encode a piece of data, it must implement the `serialize::RustcEncodable` trait.
61 //! To be able to decode a piece of data, it must implement the `serialize::RustcDecodable` trait.
62 //! The Rust compiler provides an annotation to automatically generate the code for these traits:
63 //! `#[derive(RustcDecodable, RustcEncodable)]`
65 //! The JSON API provides an enum `json::Json` and a trait `ToJson` to encode objects.
66 //! The `ToJson` trait provides a `to_json` method to convert an object into a `json::Json` value.
67 //! A `json::Json` value can be encoded as a string or buffer using the functions described above.
68 //! You can also use the `json::Encoder` object, which implements the `Encoder` trait.
70 //! When using `ToJson` the `RustcEncodable` trait implementation is not mandatory.
74 //! ## Using Autoserialization
76 //! Create a struct called `TestStruct` and serialize and deserialize it to and from JSON using the
77 //! serialization API, using the derived serialization code.
80 //! // FIXME(#19470): this cannot be ```rust``` because it fails orphan checking at the moment
81 //! extern crate serialize;
82 //! use serialize::json;
84 //! // Automatically generate `Decodable` and `Encodable` trait implementations
85 //! #[derive(RustcDecodable, RustcEncodable)]
86 //! pub struct TestStruct {
89 //! data_vector: Vec<u8>,
93 //! let object = TestStruct {
95 //! data_str: "homura".to_string(),
96 //! data_vector: vec![2,3,4,5],
99 //! // Serialize using `json::encode`
100 //! let encoded = json::encode(&object).unwrap();
102 //! // Deserialize using `json::decode`
103 //! let decoded: TestStruct = json::decode(encoded.as_slice()).unwrap();
107 //! ## Using the `ToJson` trait
109 //! The examples above use the `ToJson` trait to generate the JSON string, which is required
110 //! for custom mappings.
112 //! ### Simple example of `ToJson` usage
115 //! // FIXME(#19470): this cannot be ```rust``` because it fails orphan checking at the moment
116 //! extern crate serialize;
117 //! use serialize::json::{self, ToJson, Json};
119 //! // A custom data structure
120 //! struct ComplexNum {
125 //! // JSON value representation
126 //! impl ToJson for ComplexNum {
127 //! fn to_json(&self) -> Json {
128 //! Json::String(format!("{}+{}i", self.a, self.b))
132 //! // Only generate `RustcEncodable` trait implementation
133 //! #[derive(Encodable)]
134 //! pub struct ComplexNumRecord {
141 //! let num = ComplexNum { a: 0.0001, b: 12.539 };
142 //! let data: String = json::encode(&ComplexNumRecord{
144 //! dsc: "test".to_string(),
145 //! val: num.to_json(),
147 //! println!("data: {}", data);
148 //! // data: {"uid":1,"dsc":"test","val":"0.0001+12.539j"};
152 //! ### Verbose example of `ToJson` usage
155 //! // FIXME(#19470): this cannot be ```rust``` because it fails orphan checking at the moment
156 //! extern crate serialize;
157 //! use std::collections::BTreeMap;
158 //! use serialize::json::{self, Json, ToJson};
160 //! // Only generate `Decodable` trait implementation
161 //! #[derive(Decodable)]
162 //! pub struct TestStruct {
164 //! data_str: String,
165 //! data_vector: Vec<u8>,
168 //! // Specify encoding method manually
169 //! impl ToJson for TestStruct {
170 //! fn to_json(&self) -> Json {
171 //! let mut d = BTreeMap::new();
172 //! // All standard types implement `to_json()`, so use it
173 //! d.insert("data_int".to_string(), self.data_int.to_json());
174 //! d.insert("data_str".to_string(), self.data_str.to_json());
175 //! d.insert("data_vector".to_string(), self.data_vector.to_json());
181 //! // Serialize using `ToJson`
182 //! let input_data = TestStruct {
184 //! data_str: "madoka".to_string(),
185 //! data_vector: vec![2,3,4,5],
187 //! let json_obj: Json = input_data.to_json();
188 //! let json_str: String = json_obj.to_string();
190 //! // Deserialize like before
191 //! let decoded: TestStruct = json::decode(json_str)).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, num, str};
212 use unicode::str as unicode_str;
213 use unicode::str::Utf16Item;
217 /// Represents a json value
218 #[derive(Clone, PartialEq, PartialOrd, Debug)]
223 String(string::String),
226 Object(self::Object),
230 pub type Array = Vec<Json>;
231 pub type Object = BTreeMap<string::String, Json>;
233 pub struct PrettyJson<'a> { inner: &'a Json }
235 pub struct AsJson<'a, T: 'a> { inner: &'a T }
236 pub struct AsPrettyJson<'a, T: 'a> { inner: &'a T, indent: Option<usize> }
238 /// The errors that can arise while parsing a JSON stream.
239 #[derive(Clone, Copy, PartialEq, Debug)]
243 EOFWhileParsingObject,
244 EOFWhileParsingArray,
245 EOFWhileParsingValue,
246 EOFWhileParsingString,
252 InvalidUnicodeCodePoint,
253 LoneLeadingSurrogateInHexEscape,
254 UnexpectedEndOfHexEscape,
260 #[derive(Clone, PartialEq, Debug)]
261 pub enum ParserError {
263 SyntaxError(ErrorCode, usize, usize),
264 IoError(io::ErrorKind, String),
267 // Builder and Parser have the same errors.
268 pub type BuilderError = ParserError;
270 #[derive(Clone, PartialEq, Debug)]
271 pub enum DecoderError {
272 ParseError(ParserError),
273 ExpectedError(string::String, string::String),
274 MissingFieldError(string::String),
275 UnknownVariantError(string::String),
276 ApplicationError(string::String)
279 #[derive(Copy, Debug)]
280 pub enum EncoderError {
281 FmtError(fmt::Error),
285 /// Returns a readable error string for a given error code.
286 pub fn error_str(error: ErrorCode) -> &'static str {
288 InvalidSyntax => "invalid syntax",
289 InvalidNumber => "invalid number",
290 EOFWhileParsingObject => "EOF While parsing object",
291 EOFWhileParsingArray => "EOF While parsing array",
292 EOFWhileParsingValue => "EOF While parsing value",
293 EOFWhileParsingString => "EOF While parsing string",
294 KeyMustBeAString => "key must be a string",
295 ExpectedColon => "expected `:`",
296 TrailingCharacters => "trailing characters",
297 TrailingComma => "trailing comma",
298 InvalidEscape => "invalid escape",
299 UnrecognizedHex => "invalid \\u{ esc}ape (unrecognized hex)",
300 NotFourDigit => "invalid \\u{ esc}ape (not four digits)",
301 NotUtf8 => "contents not utf-8",
302 InvalidUnicodeCodePoint => "invalid Unicode code point",
303 LoneLeadingSurrogateInHexEscape => "lone leading surrogate in hex escape",
304 UnexpectedEndOfHexEscape => "unexpected end of hex escape",
308 /// Shortcut function to decode a JSON `&str` into an object
309 pub fn decode<T: ::Decodable>(s: &str) -> DecodeResult<T> {
310 let json = match from_str(s) {
312 Err(e) => return Err(ParseError(e))
315 let mut decoder = Decoder::new(json);
316 ::Decodable::decode(&mut decoder)
319 /// Shortcut function to encode a `T` into a JSON `String`
320 pub fn encode<T: ::Encodable>(object: &T) -> Result<string::String, EncoderError> {
321 let mut s = String::new();
323 let mut encoder = Encoder::new(&mut s);
324 try!(object.encode(&mut encoder));
329 impl fmt::Display for ErrorCode {
330 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
331 error_str(*self).fmt(f)
335 fn io_error_to_error(io: io::Error) -> ParserError {
336 IoError(io.kind(), io.to_string())
339 impl fmt::Display for ParserError {
340 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
341 // FIXME this should be a nicer error
342 fmt::Debug::fmt(self, f)
346 impl fmt::Display for DecoderError {
347 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
348 // FIXME this should be a nicer error
349 fmt::Debug::fmt(self, f)
353 impl std::error::Error for DecoderError {
354 fn description(&self) -> &str { "decoder error" }
357 impl fmt::Display for EncoderError {
358 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
359 // FIXME this should be a nicer error
360 fmt::Debug::fmt(self, f)
364 impl std::error::Error for EncoderError {
365 fn description(&self) -> &str { "encoder error" }
368 impl std::error::FromError<fmt::Error> for EncoderError {
369 fn from_error(err: fmt::Error) -> EncoderError { EncoderError::FmtError(err) }
372 pub type EncodeResult = Result<(), EncoderError>;
373 pub type DecodeResult<T> = Result<T, DecoderError>;
375 fn escape_str(wr: &mut fmt::Write, v: &str) -> EncodeResult {
376 try!(wr.write_str("\""));
380 for (i, byte) in v.bytes().enumerate() {
381 let escaped = match byte {
384 b'\x00' => "\\u0000",
385 b'\x01' => "\\u0001",
386 b'\x02' => "\\u0002",
387 b'\x03' => "\\u0003",
388 b'\x04' => "\\u0004",
389 b'\x05' => "\\u0005",
390 b'\x06' => "\\u0006",
391 b'\x07' => "\\u0007",
395 b'\x0b' => "\\u000b",
398 b'\x0e' => "\\u000e",
399 b'\x0f' => "\\u000f",
400 b'\x10' => "\\u0010",
401 b'\x11' => "\\u0011",
402 b'\x12' => "\\u0012",
403 b'\x13' => "\\u0013",
404 b'\x14' => "\\u0014",
405 b'\x15' => "\\u0015",
406 b'\x16' => "\\u0016",
407 b'\x17' => "\\u0017",
408 b'\x18' => "\\u0018",
409 b'\x19' => "\\u0019",
410 b'\x1a' => "\\u001a",
411 b'\x1b' => "\\u001b",
412 b'\x1c' => "\\u001c",
413 b'\x1d' => "\\u001d",
414 b'\x1e' => "\\u001e",
415 b'\x1f' => "\\u001f",
416 b'\x7f' => "\\u007f",
421 try!(wr.write_str(&v[start..i]));
424 try!(wr.write_str(escaped));
429 if start != v.len() {
430 try!(wr.write_str(&v[start..]));
433 try!(wr.write_str("\""));
437 fn escape_char(writer: &mut fmt::Write, v: char) -> EncodeResult {
438 let mut buf = [0; 4];
439 let n = v.encode_utf8(&mut buf).unwrap();
440 let buf = unsafe { str::from_utf8_unchecked(&buf[..n]) };
441 escape_str(writer, buf)
444 fn spaces(wr: &mut fmt::Write, mut n: usize) -> EncodeResult {
445 const BUF: &'static str = " ";
447 while n >= BUF.len() {
448 try!(wr.write_str(BUF));
453 try!(wr.write_str(&BUF[..n]));
458 fn fmt_number_or_null(v: f64) -> string::String {
460 Fp::Nan | Fp::Infinite => string::String::from_str("null"),
461 _ if v.fract() != 0f64 => f64::to_str_digits(v, 6),
462 _ => f64::to_str_digits(v, 6) + ".0",
466 /// A structure for implementing serialization to JSON.
467 pub struct Encoder<'a> {
468 writer: &'a mut (fmt::Write+'a),
469 is_emitting_map_key: bool,
472 impl<'a> Encoder<'a> {
473 /// Creates a new JSON encoder whose output will be written to the writer
475 pub fn new(writer: &'a mut fmt::Write) -> Encoder<'a> {
476 Encoder { writer: writer, is_emitting_map_key: false, }
480 macro_rules! emit_enquoted_if_mapkey {
481 ($enc:ident,$e:expr) => {
482 if $enc.is_emitting_map_key {
483 try!(write!($enc.writer, "\"{}\"", $e));
486 try!(write!($enc.writer, "{}", $e));
492 impl<'a> ::Encoder for Encoder<'a> {
493 type Error = EncoderError;
495 fn emit_nil(&mut self) -> EncodeResult {
496 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
497 try!(write!(self.writer, "null"));
501 fn emit_uint(&mut self, v: usize) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
502 fn emit_u64(&mut self, v: u64) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
503 fn emit_u32(&mut self, v: u32) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
504 fn emit_u16(&mut self, v: u16) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
505 fn emit_u8(&mut self, v: u8) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
507 fn emit_int(&mut self, v: isize) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
508 fn emit_i64(&mut self, v: i64) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
509 fn emit_i32(&mut self, v: i32) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
510 fn emit_i16(&mut self, v: i16) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
511 fn emit_i8(&mut self, v: i8) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
513 fn emit_bool(&mut self, v: bool) -> EncodeResult {
514 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
516 try!(write!(self.writer, "true"));
518 try!(write!(self.writer, "false"));
523 fn emit_f64(&mut self, v: f64) -> EncodeResult {
524 emit_enquoted_if_mapkey!(self, fmt_number_or_null(v))
526 fn emit_f32(&mut self, v: f32) -> EncodeResult {
527 self.emit_f64(v as f64)
530 fn emit_char(&mut self, v: char) -> EncodeResult {
531 escape_char(self.writer, v)
533 fn emit_str(&mut self, v: &str) -> EncodeResult {
534 escape_str(self.writer, v)
537 fn emit_enum<F>(&mut self, _name: &str, f: F) -> EncodeResult where
538 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
543 fn emit_enum_variant<F>(&mut self,
547 f: F) -> EncodeResult where
548 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
550 // enums are encoded as strings or objects
552 // Kangaroo(34,"William") => {"variant": "Kangaroo", "fields": [34,"William"]}
554 escape_str(self.writer, name)
556 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
557 try!(write!(self.writer, "{{\"variant\":"));
558 try!(escape_str(self.writer, name));
559 try!(write!(self.writer, ",\"fields\":["));
561 try!(write!(self.writer, "]}}"));
566 fn emit_enum_variant_arg<F>(&mut self, idx: usize, f: F) -> EncodeResult where
567 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
569 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
571 try!(write!(self.writer, ","));
576 fn emit_enum_struct_variant<F>(&mut self,
580 f: F) -> EncodeResult where
581 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
583 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
584 self.emit_enum_variant(name, id, cnt, f)
587 fn emit_enum_struct_variant_field<F>(&mut self,
590 f: F) -> EncodeResult where
591 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
593 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
594 self.emit_enum_variant_arg(idx, f)
597 fn emit_struct<F>(&mut self, _: &str, _: usize, f: F) -> EncodeResult where
598 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
600 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
601 try!(write!(self.writer, "{{"));
603 try!(write!(self.writer, "}}"));
607 fn emit_struct_field<F>(&mut self, name: &str, idx: usize, f: F) -> EncodeResult where
608 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
610 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
611 if idx != 0 { try!(write!(self.writer, ",")); }
612 try!(escape_str(self.writer, name));
613 try!(write!(self.writer, ":"));
617 fn emit_tuple<F>(&mut self, len: usize, f: F) -> EncodeResult where
618 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
620 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
621 self.emit_seq(len, f)
623 fn emit_tuple_arg<F>(&mut self, idx: usize, f: F) -> EncodeResult where
624 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
626 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
627 self.emit_seq_elt(idx, f)
630 fn emit_tuple_struct<F>(&mut self, _name: &str, len: usize, f: F) -> EncodeResult where
631 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
633 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
634 self.emit_seq(len, f)
636 fn emit_tuple_struct_arg<F>(&mut self, idx: usize, f: F) -> EncodeResult where
637 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
639 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
640 self.emit_seq_elt(idx, f)
643 fn emit_option<F>(&mut self, f: F) -> EncodeResult where
644 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
646 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
649 fn emit_option_none(&mut self) -> EncodeResult {
650 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
653 fn emit_option_some<F>(&mut self, f: F) -> EncodeResult where
654 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
656 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
660 fn emit_seq<F>(&mut self, _len: usize, f: F) -> EncodeResult where
661 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
663 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
664 try!(write!(self.writer, "["));
666 try!(write!(self.writer, "]"));
670 fn emit_seq_elt<F>(&mut self, idx: usize, f: F) -> EncodeResult where
671 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
673 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
675 try!(write!(self.writer, ","));
680 fn emit_map<F>(&mut self, _len: usize, f: F) -> EncodeResult where
681 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
683 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
684 try!(write!(self.writer, "{{"));
686 try!(write!(self.writer, "}}"));
690 fn emit_map_elt_key<F>(&mut self, idx: usize, f: F) -> EncodeResult where
691 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
693 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
694 if idx != 0 { try!(write!(self.writer, ",")) }
695 self.is_emitting_map_key = true;
697 self.is_emitting_map_key = false;
701 fn emit_map_elt_val<F>(&mut self, _idx: usize, f: F) -> EncodeResult where
702 F: FnOnce(&mut Encoder<'a>) -> EncodeResult,
704 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
705 try!(write!(self.writer, ":"));
710 /// Another encoder for JSON, but prints out human-readable JSON instead of
712 pub struct PrettyEncoder<'a> {
713 writer: &'a mut (fmt::Write+'a),
716 is_emitting_map_key: bool,
719 impl<'a> PrettyEncoder<'a> {
720 /// Creates a new encoder whose output will be written to the specified writer
721 pub fn new(writer: &'a mut fmt::Write) -> PrettyEncoder<'a> {
726 is_emitting_map_key: false,
730 /// Set the number of spaces to indent for each level.
731 /// This is safe to set during encoding.
732 pub fn set_indent(&mut self, indent: usize) {
733 // self.indent very well could be 0 so we need to use checked division.
734 let level = self.curr_indent.checked_div(self.indent).unwrap_or(0);
735 self.indent = indent;
736 self.curr_indent = level * self.indent;
740 impl<'a> ::Encoder for PrettyEncoder<'a> {
741 type Error = EncoderError;
743 fn emit_nil(&mut self) -> EncodeResult {
744 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
745 try!(write!(self.writer, "null"));
749 fn emit_uint(&mut self, v: usize) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
750 fn emit_u64(&mut self, v: u64) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
751 fn emit_u32(&mut self, v: u32) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
752 fn emit_u16(&mut self, v: u16) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
753 fn emit_u8(&mut self, v: u8) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
755 fn emit_int(&mut self, v: isize) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
756 fn emit_i64(&mut self, v: i64) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
757 fn emit_i32(&mut self, v: i32) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
758 fn emit_i16(&mut self, v: i16) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
759 fn emit_i8(&mut self, v: i8) -> EncodeResult { emit_enquoted_if_mapkey!(self, v) }
761 fn emit_bool(&mut self, v: bool) -> EncodeResult {
762 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
764 try!(write!(self.writer, "true"));
766 try!(write!(self.writer, "false"));
771 fn emit_f64(&mut self, v: f64) -> EncodeResult {
772 emit_enquoted_if_mapkey!(self, fmt_number_or_null(v))
774 fn emit_f32(&mut self, v: f32) -> EncodeResult {
775 self.emit_f64(v as f64)
778 fn emit_char(&mut self, v: char) -> EncodeResult {
779 escape_char(self.writer, v)
781 fn emit_str(&mut self, v: &str) -> EncodeResult {
782 escape_str(self.writer, v)
785 fn emit_enum<F>(&mut self, _name: &str, f: F) -> EncodeResult where
786 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
791 fn emit_enum_variant<F>(&mut self,
796 -> EncodeResult where
797 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
800 escape_str(self.writer, name)
802 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
803 try!(write!(self.writer, "{{\n"));
804 self.curr_indent += self.indent;
805 try!(spaces(self.writer, self.curr_indent));
806 try!(write!(self.writer, "\"variant\": "));
807 try!(escape_str(self.writer, name));
808 try!(write!(self.writer, ",\n"));
809 try!(spaces(self.writer, self.curr_indent));
810 try!(write!(self.writer, "\"fields\": [\n"));
811 self.curr_indent += self.indent;
813 self.curr_indent -= self.indent;
814 try!(write!(self.writer, "\n"));
815 try!(spaces(self.writer, self.curr_indent));
816 self.curr_indent -= self.indent;
817 try!(write!(self.writer, "]\n"));
818 try!(spaces(self.writer, self.curr_indent));
819 try!(write!(self.writer, "}}"));
824 fn emit_enum_variant_arg<F>(&mut self, idx: usize, f: F) -> EncodeResult where
825 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
827 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
829 try!(write!(self.writer, ",\n"));
831 try!(spaces(self.writer, self.curr_indent));
835 fn emit_enum_struct_variant<F>(&mut self,
839 f: F) -> EncodeResult where
840 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
842 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
843 self.emit_enum_variant(name, id, cnt, f)
846 fn emit_enum_struct_variant_field<F>(&mut self,
849 f: F) -> EncodeResult where
850 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
852 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
853 self.emit_enum_variant_arg(idx, f)
857 fn emit_struct<F>(&mut self, _: &str, len: usize, f: F) -> EncodeResult where
858 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
860 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
862 try!(write!(self.writer, "{{}}"));
864 try!(write!(self.writer, "{{"));
865 self.curr_indent += self.indent;
867 self.curr_indent -= self.indent;
868 try!(write!(self.writer, "\n"));
869 try!(spaces(self.writer, self.curr_indent));
870 try!(write!(self.writer, "}}"));
875 fn emit_struct_field<F>(&mut self, name: &str, idx: usize, f: F) -> EncodeResult where
876 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
878 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
880 try!(write!(self.writer, "\n"));
882 try!(write!(self.writer, ",\n"));
884 try!(spaces(self.writer, self.curr_indent));
885 try!(escape_str(self.writer, name));
886 try!(write!(self.writer, ": "));
890 fn emit_tuple<F>(&mut self, len: usize, f: F) -> EncodeResult where
891 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
893 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
894 self.emit_seq(len, f)
896 fn emit_tuple_arg<F>(&mut self, idx: usize, f: F) -> EncodeResult where
897 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
899 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
900 self.emit_seq_elt(idx, f)
903 fn emit_tuple_struct<F>(&mut self, _: &str, len: usize, f: F) -> EncodeResult where
904 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
906 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
907 self.emit_seq(len, f)
909 fn emit_tuple_struct_arg<F>(&mut self, idx: usize, f: F) -> EncodeResult where
910 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
912 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
913 self.emit_seq_elt(idx, f)
916 fn emit_option<F>(&mut self, f: F) -> EncodeResult where
917 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
919 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
922 fn emit_option_none(&mut self) -> EncodeResult {
923 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
926 fn emit_option_some<F>(&mut self, f: F) -> EncodeResult where
927 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
929 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
933 fn emit_seq<F>(&mut self, len: usize, f: F) -> EncodeResult where
934 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
936 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
938 try!(write!(self.writer, "[]"));
940 try!(write!(self.writer, "["));
941 self.curr_indent += self.indent;
943 self.curr_indent -= self.indent;
944 try!(write!(self.writer, "\n"));
945 try!(spaces(self.writer, self.curr_indent));
946 try!(write!(self.writer, "]"));
951 fn emit_seq_elt<F>(&mut self, idx: usize, f: F) -> EncodeResult where
952 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
954 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
956 try!(write!(self.writer, "\n"));
958 try!(write!(self.writer, ",\n"));
960 try!(spaces(self.writer, self.curr_indent));
964 fn emit_map<F>(&mut self, len: usize, f: F) -> EncodeResult where
965 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
967 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
969 try!(write!(self.writer, "{{}}"));
971 try!(write!(self.writer, "{{"));
972 self.curr_indent += self.indent;
974 self.curr_indent -= self.indent;
975 try!(write!(self.writer, "\n"));
976 try!(spaces(self.writer, self.curr_indent));
977 try!(write!(self.writer, "}}"));
982 fn emit_map_elt_key<F>(&mut self, idx: usize, f: F) -> EncodeResult where
983 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
985 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
987 try!(write!(self.writer, "\n"));
989 try!(write!(self.writer, ",\n"));
991 try!(spaces(self.writer, self.curr_indent));
992 self.is_emitting_map_key = true;
994 self.is_emitting_map_key = false;
998 fn emit_map_elt_val<F>(&mut self, _idx: usize, f: F) -> EncodeResult where
999 F: FnOnce(&mut PrettyEncoder<'a>) -> EncodeResult,
1001 if self.is_emitting_map_key { return Err(EncoderError::BadHashmapKey); }
1002 try!(write!(self.writer, ": "));
1007 impl Encodable for Json {
1008 fn encode<E: ::Encoder>(&self, e: &mut E) -> Result<(), E::Error> {
1010 Json::I64(v) => v.encode(e),
1011 Json::U64(v) => v.encode(e),
1012 Json::F64(v) => v.encode(e),
1013 Json::String(ref v) => v.encode(e),
1014 Json::Boolean(v) => v.encode(e),
1015 Json::Array(ref v) => v.encode(e),
1016 Json::Object(ref v) => v.encode(e),
1017 Json::Null => e.emit_nil(),
1022 /// Create an `AsJson` wrapper which can be used to print a value as JSON
1023 /// on-the-fly via `write!`
1024 pub fn as_json<T>(t: &T) -> AsJson<T> {
1028 /// Create an `AsPrettyJson` wrapper which can be used to print a value as JSON
1029 /// on-the-fly via `write!`
1030 pub fn as_pretty_json<T>(t: &T) -> AsPrettyJson<T> {
1031 AsPrettyJson { inner: t, indent: None }
1035 /// Borrow this json object as a pretty object to generate a pretty
1036 /// representation for it via `Display`.
1037 pub fn pretty(&self) -> PrettyJson {
1038 PrettyJson { inner: self }
1041 /// If the Json value is an Object, returns the value associated with the provided key.
1042 /// Otherwise, returns None.
1043 pub fn find<'a>(&'a self, key: &str) -> Option<&'a Json>{
1045 &Json::Object(ref map) => map.get(key),
1050 /// Attempts to get a nested Json Object for each key in `keys`.
1051 /// If any key is found not to exist, find_path will return None.
1052 /// Otherwise, it will return the Json value associated with the final key.
1053 pub fn find_path<'a>(&'a self, keys: &[&str]) -> Option<&'a Json>{
1054 let mut target = self;
1056 match target.find(*key) {
1057 Some(t) => { target = t; },
1064 /// If the Json value is an Object, performs a depth-first search until
1065 /// a value associated with the provided key is found. If no value is found
1066 /// or the Json value is not an Object, returns None.
1067 pub fn search<'a>(&'a self, key: &str) -> Option<&'a Json> {
1069 &Json::Object(ref map) => {
1070 match map.get(key) {
1071 Some(json_value) => Some(json_value),
1074 match v.search(key) {
1075 x if x.is_some() => return x,
1087 /// Returns true if the Json value is an Object. Returns false otherwise.
1088 pub fn is_object<'a>(&'a self) -> bool {
1089 self.as_object().is_some()
1092 /// If the Json value is an Object, returns the associated BTreeMap.
1093 /// Returns None otherwise.
1094 pub fn as_object<'a>(&'a self) -> Option<&'a Object> {
1096 &Json::Object(ref map) => Some(map),
1101 /// Returns true if the Json value is an Array. Returns false otherwise.
1102 pub fn is_array<'a>(&'a self) -> bool {
1103 self.as_array().is_some()
1106 /// If the Json value is an Array, returns the associated vector.
1107 /// Returns None otherwise.
1108 pub fn as_array<'a>(&'a self) -> Option<&'a Array> {
1110 &Json::Array(ref array) => Some(&*array),
1115 /// Returns true if the Json value is a String. Returns false otherwise.
1116 pub fn is_string<'a>(&'a self) -> bool {
1117 self.as_string().is_some()
1120 /// If the Json value is a String, returns the associated str.
1121 /// Returns None otherwise.
1122 pub fn as_string<'a>(&'a self) -> Option<&'a str> {
1124 Json::String(ref s) => Some(&s[..]),
1129 /// Returns true if the Json value is a Number. Returns false otherwise.
1130 pub fn is_number(&self) -> bool {
1132 Json::I64(_) | Json::U64(_) | Json::F64(_) => true,
1137 /// Returns true if the Json value is a i64. Returns false otherwise.
1138 pub fn is_i64(&self) -> bool {
1140 Json::I64(_) => true,
1145 /// Returns true if the Json value is a u64. Returns false otherwise.
1146 pub fn is_u64(&self) -> bool {
1148 Json::U64(_) => true,
1153 /// Returns true if the Json value is a f64. Returns false otherwise.
1154 pub fn is_f64(&self) -> bool {
1156 Json::F64(_) => true,
1161 /// If the Json value is a number, return or cast it to a i64.
1162 /// Returns None otherwise.
1163 pub fn as_i64(&self) -> Option<i64> {
1165 Json::I64(n) => Some(n),
1166 Json::U64(n) => num::cast(n),
1171 /// If the Json value is a number, return or cast it to a u64.
1172 /// Returns None otherwise.
1173 pub fn as_u64(&self) -> Option<u64> {
1175 Json::I64(n) => num::cast(n),
1176 Json::U64(n) => Some(n),
1181 /// If the Json value is a number, return or cast it to a f64.
1182 /// Returns None otherwise.
1183 pub fn as_f64(&self) -> Option<f64> {
1185 Json::I64(n) => num::cast(n),
1186 Json::U64(n) => num::cast(n),
1187 Json::F64(n) => Some(n),
1192 /// Returns true if the Json value is a Boolean. Returns false otherwise.
1193 pub fn is_boolean(&self) -> bool {
1194 self.as_boolean().is_some()
1197 /// If the Json value is a Boolean, returns the associated bool.
1198 /// Returns None otherwise.
1199 pub fn as_boolean(&self) -> Option<bool> {
1201 &Json::Boolean(b) => Some(b),
1206 /// Returns true if the Json value is a Null. Returns false otherwise.
1207 pub fn is_null(&self) -> bool {
1208 self.as_null().is_some()
1211 /// If the Json value is a Null, returns ().
1212 /// Returns None otherwise.
1213 pub fn as_null(&self) -> Option<()> {
1215 &Json::Null => Some(()),
1221 impl<'a> Index<&'a str> for Json {
1224 fn index(&self, idx: &'a str) -> &Json {
1225 self.find(idx).unwrap()
1229 impl Index<usize> for Json {
1232 fn index<'a>(&'a self, idx: usize) -> &'a Json {
1234 &Json::Array(ref v) => &v[idx],
1235 _ => panic!("can only index Json with usize if it is an array")
1240 /// The output of the streaming parser.
1241 #[derive(PartialEq, Clone, Debug)]
1242 pub enum JsonEvent {
1251 StringValue(string::String),
1256 #[derive(PartialEq, Debug)]
1258 // Parse a value in an array, true means first element.
1260 // Parse ',' or ']' after an element in an array.
1262 // Parse a key:value in an object, true means first element.
1264 // Parse ',' or ']' after an element in an object.
1268 // Expecting the stream to end.
1270 // Parsing can't continue.
1274 /// A Stack represents the current position of the parser in the logical
1275 /// structure of the JSON stream.
1276 /// For example foo.bar[3].x
1278 stack: Vec<InternalStackElement>,
1279 str_buffer: Vec<u8>,
1282 /// StackElements compose a Stack.
1283 /// For example, StackElement::Key("foo"), StackElement::Key("bar"),
1284 /// StackElement::Index(3) and StackElement::Key("x") are the
1285 /// StackElements compositing the stack that represents foo.bar[3].x
1286 #[derive(PartialEq, Clone, Debug)]
1287 pub enum StackElement<'l> {
1292 // Internally, Key elements are stored as indices in a buffer to avoid
1293 // allocating a string for every member of an object.
1294 #[derive(PartialEq, Clone, Debug)]
1295 enum InternalStackElement {
1297 InternalKey(u16, u16), // start, size
1301 pub fn new() -> Stack {
1302 Stack { stack: Vec::new(), str_buffer: Vec::new() }
1305 /// Returns The number of elements in the Stack.
1306 pub fn len(&self) -> usize { self.stack.len() }
1308 /// Returns true if the stack is empty.
1309 pub fn is_empty(&self) -> bool { self.stack.is_empty() }
1311 /// Provides access to the StackElement at a given index.
1312 /// lower indices are at the bottom of the stack while higher indices are
1314 pub fn get<'l>(&'l self, idx: usize) -> StackElement<'l> {
1315 match self.stack[idx] {
1316 InternalIndex(i) => StackElement::Index(i),
1317 InternalKey(start, size) => {
1318 StackElement::Key(str::from_utf8(
1319 &self.str_buffer[start as usize .. start as usize + size as usize])
1325 /// Compares this stack with an array of StackElements.
1326 pub fn is_equal_to(&self, rhs: &[StackElement]) -> bool {
1327 if self.stack.len() != rhs.len() { return false; }
1328 for i in 0..rhs.len() {
1329 if self.get(i) != rhs[i] { return false; }
1334 /// Returns true if the bottom-most elements of this stack are the same as
1335 /// the ones passed as parameter.
1336 pub fn starts_with(&self, rhs: &[StackElement]) -> bool {
1337 if self.stack.len() < rhs.len() { return false; }
1338 for i in 0..rhs.len() {
1339 if self.get(i) != rhs[i] { return false; }
1344 /// Returns true if the top-most elements of this stack are the same as
1345 /// the ones passed as parameter.
1346 pub fn ends_with(&self, rhs: &[StackElement]) -> bool {
1347 if self.stack.len() < rhs.len() { return false; }
1348 let offset = self.stack.len() - rhs.len();
1349 for i in 0..rhs.len() {
1350 if self.get(i + offset) != rhs[i] { return false; }
1355 /// Returns the top-most element (if any).
1356 pub fn top<'l>(&'l self) -> Option<StackElement<'l>> {
1357 return match self.stack.last() {
1359 Some(&InternalIndex(i)) => Some(StackElement::Index(i)),
1360 Some(&InternalKey(start, size)) => {
1361 Some(StackElement::Key(str::from_utf8(
1362 &self.str_buffer[start as usize .. (start+size) as usize]
1368 // Used by Parser to insert StackElement::Key elements at the top of the stack.
1369 fn push_key(&mut self, key: string::String) {
1370 self.stack.push(InternalKey(self.str_buffer.len() as u16, key.len() as u16));
1371 for c in key.as_bytes() {
1372 self.str_buffer.push(*c);
1376 // Used by Parser to insert StackElement::Index elements at the top of the stack.
1377 fn push_index(&mut self, index: u32) {
1378 self.stack.push(InternalIndex(index));
1381 // Used by Parser to remove the top-most element of the stack.
1383 assert!(!self.is_empty());
1384 match *self.stack.last().unwrap() {
1385 InternalKey(_, sz) => {
1386 let new_size = self.str_buffer.len() - sz as usize;
1387 self.str_buffer.truncate(new_size);
1389 InternalIndex(_) => {}
1394 // Used by Parser to test whether the top-most element is an index.
1395 fn last_is_index(&self) -> bool {
1396 if self.is_empty() { return false; }
1397 return match *self.stack.last().unwrap() {
1398 InternalIndex(_) => true,
1403 // Used by Parser to increment the index of the top-most element.
1404 fn bump_index(&mut self) {
1405 let len = self.stack.len();
1406 let idx = match *self.stack.last().unwrap() {
1407 InternalIndex(i) => { i + 1 }
1410 self.stack[len - 1] = InternalIndex(idx);
1414 /// A streaming JSON parser implemented as an iterator of JsonEvent, consuming
1415 /// an iterator of char.
1416 pub struct Parser<T> {
1421 // We maintain a stack representing where we are in the logical structure
1422 // of the JSON stream.
1424 // A state machine is kept to make it possible to interrupt and resume parsing.
1428 impl<T: Iterator<Item=char>> Iterator for Parser<T> {
1429 type Item = JsonEvent;
1431 fn next(&mut self) -> Option<JsonEvent> {
1432 if self.state == ParseFinished {
1436 if self.state == ParseBeforeFinish {
1437 self.parse_whitespace();
1438 // Make sure there is no trailing characters.
1440 self.state = ParseFinished;
1443 return Some(self.error_event(TrailingCharacters));
1447 return Some(self.parse());
1451 impl<T: Iterator<Item=char>> Parser<T> {
1452 /// Creates the JSON parser.
1453 pub fn new(rdr: T) -> Parser<T> {
1454 let mut p = Parser {
1459 stack: Stack::new(),
1466 /// Provides access to the current position in the logical structure of the
1468 pub fn stack<'l>(&'l self) -> &'l Stack {
1472 fn eof(&self) -> bool { self.ch.is_none() }
1473 fn ch_or_null(&self) -> char { self.ch.unwrap_or('\x00') }
1474 fn bump(&mut self) {
1475 self.ch = self.rdr.next();
1477 if self.ch_is('\n') {
1485 fn next_char(&mut self) -> Option<char> {
1489 fn ch_is(&self, c: char) -> bool {
1493 fn error<U>(&self, reason: ErrorCode) -> Result<U, ParserError> {
1494 Err(SyntaxError(reason, self.line, self.col))
1497 fn parse_whitespace(&mut self) {
1498 while self.ch_is(' ') ||
1501 self.ch_is('\r') { self.bump(); }
1504 fn parse_number(&mut self) -> JsonEvent {
1505 let mut neg = false;
1507 if self.ch_is('-') {
1512 let res = match self.parse_u64() {
1514 Err(e) => { return Error(e); }
1517 if self.ch_is('.') || self.ch_is('e') || self.ch_is('E') {
1518 let mut res = res as f64;
1520 if self.ch_is('.') {
1521 res = match self.parse_decimal(res) {
1523 Err(e) => { return Error(e); }
1527 if self.ch_is('e') || self.ch_is('E') {
1528 res = match self.parse_exponent(res) {
1530 Err(e) => { return Error(e); }
1541 let res = -(res as i64);
1543 // Make sure we didn't underflow.
1545 Error(SyntaxError(InvalidNumber, self.line, self.col))
1555 fn parse_u64(&mut self) -> Result<u64, ParserError> {
1557 let last_accum = 0; // necessary to detect overflow.
1559 match self.ch_or_null() {
1563 // A leading '0' must be the only digit before the decimal point.
1564 match self.ch_or_null() {
1565 '0' ... '9' => return self.error(InvalidNumber),
1571 match self.ch_or_null() {
1572 c @ '0' ... '9' => {
1573 accum = accum.wrapping_mul(10);
1574 accum = accum.wrapping_add((c as u64) - ('0' as u64));
1576 // Detect overflow by comparing to the last value.
1577 if accum <= last_accum { return self.error(InvalidNumber); }
1585 _ => return self.error(InvalidNumber),
1591 fn parse_decimal(&mut self, mut res: f64) -> Result<f64, ParserError> {
1594 // Make sure a digit follows the decimal place.
1595 match self.ch_or_null() {
1597 _ => return self.error(InvalidNumber)
1602 match self.ch_or_null() {
1603 c @ '0' ... '9' => {
1605 res += (((c as isize) - ('0' as isize)) as f64) * dec;
1615 fn parse_exponent(&mut self, mut res: f64) -> Result<f64, ParserError> {
1619 let mut neg_exp = false;
1621 if self.ch_is('+') {
1623 } else if self.ch_is('-') {
1628 // Make sure a digit follows the exponent place.
1629 match self.ch_or_null() {
1631 _ => return self.error(InvalidNumber)
1634 match self.ch_or_null() {
1635 c @ '0' ... '9' => {
1637 exp += (c as usize) - ('0' as usize);
1645 let exp = 10_f64.powi(exp as i32);
1655 fn decode_hex_escape(&mut self) -> Result<u16, ParserError> {
1658 while i < 4 && !self.eof() {
1660 n = match self.ch_or_null() {
1661 c @ '0' ... '9' => n * 16 + ((c as u16) - ('0' as u16)),
1662 'a' | 'A' => n * 16 + 10,
1663 'b' | 'B' => n * 16 + 11,
1664 'c' | 'C' => n * 16 + 12,
1665 'd' | 'D' => n * 16 + 13,
1666 'e' | 'E' => n * 16 + 14,
1667 'f' | 'F' => n * 16 + 15,
1668 _ => return self.error(InvalidEscape)
1674 // Error out if we didn't parse 4 digits.
1676 return self.error(InvalidEscape);
1682 fn parse_str(&mut self) -> Result<string::String, ParserError> {
1683 let mut escape = false;
1684 let mut res = string::String::new();
1689 return self.error(EOFWhileParsingString);
1693 match self.ch_or_null() {
1694 '"' => res.push('"'),
1695 '\\' => res.push('\\'),
1696 '/' => res.push('/'),
1697 'b' => res.push('\x08'),
1698 'f' => res.push('\x0c'),
1699 'n' => res.push('\n'),
1700 'r' => res.push('\r'),
1701 't' => res.push('\t'),
1702 'u' => match try!(self.decode_hex_escape()) {
1703 0xDC00 ... 0xDFFF => {
1704 return self.error(LoneLeadingSurrogateInHexEscape)
1707 // Non-BMP characters are encoded as a sequence of
1708 // two hex escapes, representing UTF-16 surrogates.
1709 n1 @ 0xD800 ... 0xDBFF => {
1710 match (self.next_char(), self.next_char()) {
1711 (Some('\\'), Some('u')) => (),
1712 _ => return self.error(UnexpectedEndOfHexEscape),
1715 let buf = [n1, try!(self.decode_hex_escape())];
1716 match unicode_str::utf16_items(&buf).next() {
1717 Some(Utf16Item::ScalarValue(c)) => res.push(c),
1718 _ => return self.error(LoneLeadingSurrogateInHexEscape),
1722 n => match char::from_u32(n as u32) {
1723 Some(c) => res.push(c),
1724 None => return self.error(InvalidUnicodeCodePoint),
1727 _ => return self.error(InvalidEscape),
1730 } else if self.ch_is('\\') {
1738 Some(c) => res.push(c),
1739 None => unreachable!()
1745 // Invoked at each iteration, consumes the stream until it has enough
1746 // information to return a JsonEvent.
1747 // Manages an internal state so that parsing can be interrupted and resumed.
1748 // Also keeps track of the position in the logical structure of the json
1749 // stream isize the form of a stack that can be queried by the user using the
1751 fn parse(&mut self) -> JsonEvent {
1753 // The only paths where the loop can spin a new iteration
1754 // are in the cases ParseArrayComma and ParseObjectComma if ','
1755 // is parsed. In these cases the state is set to (respectively)
1756 // ParseArray(false) and ParseObject(false), which always return,
1757 // so there is no risk of getting stuck in an infinite loop.
1758 // All other paths return before the end of the loop's iteration.
1759 self.parse_whitespace();
1763 return self.parse_start();
1765 ParseArray(first) => {
1766 return self.parse_array(first);
1768 ParseArrayComma => {
1769 match self.parse_array_comma_or_end() {
1770 Some(evt) => { return evt; }
1774 ParseObject(first) => {
1775 return self.parse_object(first);
1777 ParseObjectComma => {
1779 if self.ch_is(',') {
1780 self.state = ParseObject(false);
1783 return self.parse_object_end();
1787 return self.error_event(InvalidSyntax);
1793 fn parse_start(&mut self) -> JsonEvent {
1794 let val = self.parse_value();
1795 self.state = match val {
1796 Error(_) => ParseFinished,
1797 ArrayStart => ParseArray(true),
1798 ObjectStart => ParseObject(true),
1799 _ => ParseBeforeFinish,
1804 fn parse_array(&mut self, first: bool) -> JsonEvent {
1805 if self.ch_is(']') {
1807 self.error_event(InvalidSyntax)
1809 self.state = if self.stack.is_empty() {
1811 } else if self.stack.last_is_index() {
1821 self.stack.push_index(0);
1823 let val = self.parse_value();
1824 self.state = match val {
1825 Error(_) => ParseFinished,
1826 ArrayStart => ParseArray(true),
1827 ObjectStart => ParseObject(true),
1828 _ => ParseArrayComma,
1834 fn parse_array_comma_or_end(&mut self) -> Option<JsonEvent> {
1835 if self.ch_is(',') {
1836 self.stack.bump_index();
1837 self.state = ParseArray(false);
1840 } else if self.ch_is(']') {
1842 self.state = if self.stack.is_empty() {
1844 } else if self.stack.last_is_index() {
1851 } else if self.eof() {
1852 Some(self.error_event(EOFWhileParsingArray))
1854 Some(self.error_event(InvalidSyntax))
1858 fn parse_object(&mut self, first: bool) -> JsonEvent {
1859 if self.ch_is('}') {
1861 if self.stack.is_empty() {
1862 return self.error_event(TrailingComma);
1867 self.state = if self.stack.is_empty() {
1869 } else if self.stack.last_is_index() {
1878 return self.error_event(EOFWhileParsingObject);
1880 if !self.ch_is('"') {
1881 return self.error_event(KeyMustBeAString);
1883 let s = match self.parse_str() {
1886 self.state = ParseFinished;
1890 self.parse_whitespace();
1892 return self.error_event(EOFWhileParsingObject);
1893 } else if self.ch_or_null() != ':' {
1894 return self.error_event(ExpectedColon);
1896 self.stack.push_key(s);
1898 self.parse_whitespace();
1900 let val = self.parse_value();
1902 self.state = match val {
1903 Error(_) => ParseFinished,
1904 ArrayStart => ParseArray(true),
1905 ObjectStart => ParseObject(true),
1906 _ => ParseObjectComma,
1911 fn parse_object_end(&mut self) -> JsonEvent {
1912 if self.ch_is('}') {
1913 self.state = if self.stack.is_empty() {
1915 } else if self.stack.last_is_index() {
1922 } else if self.eof() {
1923 self.error_event(EOFWhileParsingObject)
1925 self.error_event(InvalidSyntax)
1929 fn parse_value(&mut self) -> JsonEvent {
1930 if self.eof() { return self.error_event(EOFWhileParsingValue); }
1931 match self.ch_or_null() {
1932 'n' => { self.parse_ident("ull", NullValue) }
1933 't' => { self.parse_ident("rue", BooleanValue(true)) }
1934 'f' => { self.parse_ident("alse", BooleanValue(false)) }
1935 '0' ... '9' | '-' => self.parse_number(),
1936 '"' => match self.parse_str() {
1937 Ok(s) => StringValue(s),
1948 _ => { self.error_event(InvalidSyntax) }
1952 fn parse_ident(&mut self, ident: &str, value: JsonEvent) -> JsonEvent {
1953 if ident.chars().all(|c| Some(c) == self.next_char()) {
1957 Error(SyntaxError(InvalidSyntax, self.line, self.col))
1961 fn error_event(&mut self, reason: ErrorCode) -> JsonEvent {
1962 self.state = ParseFinished;
1963 Error(SyntaxError(reason, self.line, self.col))
1967 /// A Builder consumes a json::Parser to create a generic Json structure.
1968 pub struct Builder<T> {
1970 token: Option<JsonEvent>,
1973 impl<T: Iterator<Item=char>> Builder<T> {
1974 /// Create a JSON Builder.
1975 pub fn new(src: T) -> Builder<T> {
1976 Builder { parser: Parser::new(src), token: None, }
1979 // Decode a Json value from a Parser.
1980 pub fn build(&mut self) -> Result<Json, BuilderError> {
1982 let result = self.build_value();
1986 Some(Error(ref e)) => { return Err(e.clone()); }
1987 ref tok => { panic!("unexpected token {:?}", tok.clone()); }
1992 fn bump(&mut self) {
1993 self.token = self.parser.next();
1996 fn build_value(&mut self) -> Result<Json, BuilderError> {
1997 return match self.token {
1998 Some(NullValue) => Ok(Json::Null),
1999 Some(I64Value(n)) => Ok(Json::I64(n)),
2000 Some(U64Value(n)) => Ok(Json::U64(n)),
2001 Some(F64Value(n)) => Ok(Json::F64(n)),
2002 Some(BooleanValue(b)) => Ok(Json::Boolean(b)),
2003 Some(StringValue(ref mut s)) => {
2004 let mut temp = string::String::new();
2006 Ok(Json::String(temp))
2008 Some(Error(ref e)) => Err(e.clone()),
2009 Some(ArrayStart) => self.build_array(),
2010 Some(ObjectStart) => self.build_object(),
2011 Some(ObjectEnd) => self.parser.error(InvalidSyntax),
2012 Some(ArrayEnd) => self.parser.error(InvalidSyntax),
2013 None => self.parser.error(EOFWhileParsingValue),
2017 fn build_array(&mut self) -> Result<Json, BuilderError> {
2019 let mut values = Vec::new();
2022 if self.token == Some(ArrayEnd) {
2023 return Ok(Json::Array(values.into_iter().collect()));
2025 match self.build_value() {
2026 Ok(v) => values.push(v),
2027 Err(e) => { return Err(e) }
2033 fn build_object(&mut self) -> Result<Json, BuilderError> {
2036 let mut values = BTreeMap::new();
2040 Some(ObjectEnd) => { return Ok(Json::Object(values)); }
2041 Some(Error(ref e)) => { return Err(e.clone()); }
2045 let key = match self.parser.stack().top() {
2046 Some(StackElement::Key(k)) => { k.to_string() }
2047 _ => { panic!("invalid state"); }
2049 match self.build_value() {
2050 Ok(value) => { values.insert(key, value); }
2051 Err(e) => { return Err(e); }
2055 return self.parser.error(EOFWhileParsingObject);
2059 /// Decodes a json value from an `&mut old_io::Reader`
2060 pub fn from_reader(rdr: &mut Read) -> Result<Json, BuilderError> {
2061 let mut contents = Vec::new();
2062 match rdr.read_to_end(&mut contents) {
2064 Err(e) => return Err(io_error_to_error(e))
2066 let s = match str::from_utf8(&contents).ok() {
2068 _ => return Err(SyntaxError(NotUtf8, 0, 0))
2070 let mut builder = Builder::new(s.chars());
2074 /// Decodes a json value from a string
2075 pub fn from_str(s: &str) -> Result<Json, BuilderError> {
2076 let mut builder = Builder::new(s.chars());
2080 /// A structure to decode JSON to values in rust.
2081 pub struct Decoder {
2086 /// Creates a new decoder instance for decoding the specified JSON value.
2087 pub fn new(json: Json) -> Decoder {
2088 Decoder { stack: vec![json] }
2093 fn pop(&mut self) -> Json {
2094 self.stack.pop().unwrap()
2098 macro_rules! expect {
2099 ($e:expr, Null) => ({
2101 Json::Null => Ok(()),
2102 other => Err(ExpectedError("Null".to_string(),
2103 format!("{}", other)))
2106 ($e:expr, $t:ident) => ({
2108 Json::$t(v) => Ok(v),
2110 Err(ExpectedError(stringify!($t).to_string(),
2111 format!("{}", other)))
2117 macro_rules! read_primitive {
2118 ($name:ident, $ty:ty) => {
2119 fn $name(&mut self) -> DecodeResult<$ty> {
2121 Json::I64(f) => match num::cast(f) {
2123 None => Err(ExpectedError("Number".to_string(), format!("{}", f))),
2125 Json::U64(f) => match num::cast(f) {
2127 None => Err(ExpectedError("Number".to_string(), format!("{}", f))),
2129 Json::F64(f) => Err(ExpectedError("Integer".to_string(), format!("{}", f))),
2130 // re: #12967.. a type w/ numeric keys (ie HashMap<usize, V> etc)
2131 // is going to have a string here, as per JSON spec.
2132 Json::String(s) => match s.parse().ok() {
2134 None => Err(ExpectedError("Number".to_string(), s)),
2136 value => Err(ExpectedError("Number".to_string(), format!("{}", value))),
2142 impl ::Decoder for Decoder {
2143 type Error = DecoderError;
2145 fn read_nil(&mut self) -> DecodeResult<()> {
2146 expect!(self.pop(), Null)
2149 read_primitive! { read_uint, usize }
2150 read_primitive! { read_u8, u8 }
2151 read_primitive! { read_u16, u16 }
2152 read_primitive! { read_u32, u32 }
2153 read_primitive! { read_u64, u64 }
2154 read_primitive! { read_int, isize }
2155 read_primitive! { read_i8, i8 }
2156 read_primitive! { read_i16, i16 }
2157 read_primitive! { read_i32, i32 }
2158 read_primitive! { read_i64, i64 }
2160 fn read_f32(&mut self) -> DecodeResult<f32> { self.read_f64().map(|x| x as f32) }
2162 fn read_f64(&mut self) -> DecodeResult<f64> {
2164 Json::I64(f) => Ok(f as f64),
2165 Json::U64(f) => Ok(f as f64),
2166 Json::F64(f) => Ok(f),
2167 Json::String(s) => {
2168 // re: #12967.. a type w/ numeric keys (ie HashMap<usize, V> etc)
2169 // is going to have a string here, as per JSON spec.
2170 match s.parse().ok() {
2172 None => Err(ExpectedError("Number".to_string(), s)),
2175 Json::Null => Ok(f64::NAN),
2176 value => Err(ExpectedError("Number".to_string(), format!("{}", value)))
2180 fn read_bool(&mut self) -> DecodeResult<bool> {
2181 expect!(self.pop(), Boolean)
2184 fn read_char(&mut self) -> DecodeResult<char> {
2185 let s = try!(self.read_str());
2187 let mut it = s.chars();
2188 match (it.next(), it.next()) {
2189 // exactly one character
2190 (Some(c), None) => return Ok(c),
2194 Err(ExpectedError("single character string".to_string(), format!("{}", s)))
2197 fn read_str(&mut self) -> DecodeResult<string::String> {
2198 expect!(self.pop(), String)
2201 fn read_enum<T, F>(&mut self, _name: &str, f: F) -> DecodeResult<T> where
2202 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2207 fn read_enum_variant<T, F>(&mut self, names: &[&str],
2208 mut f: F) -> DecodeResult<T>
2209 where F: FnMut(&mut Decoder, usize) -> DecodeResult<T>,
2211 let name = match self.pop() {
2212 Json::String(s) => s,
2213 Json::Object(mut o) => {
2214 let n = match o.remove(&"variant".to_string()) {
2215 Some(Json::String(s)) => s,
2217 return Err(ExpectedError("String".to_string(), format!("{}", val)))
2220 return Err(MissingFieldError("variant".to_string()))
2223 match o.remove(&"fields".to_string()) {
2224 Some(Json::Array(l)) => {
2225 for field in l.into_iter().rev() {
2226 self.stack.push(field);
2230 return Err(ExpectedError("Array".to_string(), format!("{}", val)))
2233 return Err(MissingFieldError("fields".to_string()))
2239 return Err(ExpectedError("String or Object".to_string(), format!("{}", json)))
2242 let idx = match names.iter().position(|n| *n == &name[..]) {
2244 None => return Err(UnknownVariantError(name))
2249 fn read_enum_variant_arg<T, F>(&mut self, _idx: usize, f: F) -> DecodeResult<T> where
2250 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2255 fn read_enum_struct_variant<T, F>(&mut self, names: &[&str], f: F) -> DecodeResult<T> where
2256 F: FnMut(&mut Decoder, usize) -> DecodeResult<T>,
2258 self.read_enum_variant(names, f)
2262 fn read_enum_struct_variant_field<T, F>(&mut self,
2266 -> DecodeResult<T> where
2267 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2269 self.read_enum_variant_arg(idx, f)
2272 fn read_struct<T, F>(&mut self, _name: &str, _len: usize, f: F) -> DecodeResult<T> where
2273 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2275 let value = try!(f(self));
2280 fn read_struct_field<T, F>(&mut self,
2284 -> DecodeResult<T> where
2285 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2287 let mut obj = try!(expect!(self.pop(), Object));
2289 let value = match obj.remove(&name.to_string()) {
2291 // Add a Null and try to parse it as an Option<_>
2292 // to get None as a default value.
2293 self.stack.push(Json::Null);
2296 Err(_) => return Err(MissingFieldError(name.to_string())),
2300 self.stack.push(json);
2304 self.stack.push(Json::Object(obj));
2308 fn read_tuple<T, F>(&mut self, tuple_len: usize, f: F) -> DecodeResult<T> where
2309 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2311 self.read_seq(move |d, len| {
2312 if len == tuple_len {
2315 Err(ExpectedError(format!("Tuple{}", tuple_len), format!("Tuple{}", len)))
2320 fn read_tuple_arg<T, F>(&mut self, idx: usize, f: F) -> DecodeResult<T> where
2321 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2323 self.read_seq_elt(idx, f)
2326 fn read_tuple_struct<T, F>(&mut self,
2330 -> DecodeResult<T> where
2331 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2333 self.read_tuple(len, f)
2336 fn read_tuple_struct_arg<T, F>(&mut self,
2339 -> DecodeResult<T> where
2340 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2342 self.read_tuple_arg(idx, f)
2345 fn read_option<T, F>(&mut self, mut f: F) -> DecodeResult<T> where
2346 F: FnMut(&mut Decoder, bool) -> DecodeResult<T>,
2349 Json::Null => f(self, false),
2350 value => { self.stack.push(value); f(self, true) }
2354 fn read_seq<T, F>(&mut self, f: F) -> DecodeResult<T> where
2355 F: FnOnce(&mut Decoder, usize) -> DecodeResult<T>,
2357 let array = try!(expect!(self.pop(), Array));
2358 let len = array.len();
2359 for v in array.into_iter().rev() {
2365 fn read_seq_elt<T, F>(&mut self, _idx: usize, f: F) -> DecodeResult<T> where
2366 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2371 fn read_map<T, F>(&mut self, f: F) -> DecodeResult<T> where
2372 F: FnOnce(&mut Decoder, usize) -> DecodeResult<T>,
2374 let obj = try!(expect!(self.pop(), Object));
2375 let len = obj.len();
2376 for (key, value) in obj {
2377 self.stack.push(value);
2378 self.stack.push(Json::String(key));
2383 fn read_map_elt_key<T, F>(&mut self, _idx: usize, f: F) -> DecodeResult<T> where
2384 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2389 fn read_map_elt_val<T, F>(&mut self, _idx: usize, f: F) -> DecodeResult<T> where
2390 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2395 fn error(&mut self, err: &str) -> DecoderError {
2396 ApplicationError(err.to_string())
2400 /// A trait for converting values to JSON
2402 /// Converts the value of `self` to an instance of JSON
2403 fn to_json(&self) -> Json;
2406 macro_rules! to_json_impl_i64 {
2408 $(impl ToJson for $t {
2409 fn to_json(&self) -> Json {
2410 Json::I64(*self as i64)
2416 to_json_impl_i64! { isize, i8, i16, i32, i64 }
2418 macro_rules! to_json_impl_u64 {
2420 $(impl ToJson for $t {
2421 fn to_json(&self) -> Json {
2422 Json::U64(*self as u64)
2428 to_json_impl_u64! { usize, u8, u16, u32, u64 }
2430 impl ToJson for Json {
2431 fn to_json(&self) -> Json { self.clone() }
2434 impl ToJson for f32 {
2435 fn to_json(&self) -> Json { (*self as f64).to_json() }
2438 impl ToJson for f64 {
2439 fn to_json(&self) -> Json {
2440 match self.classify() {
2441 Fp::Nan | Fp::Infinite => Json::Null,
2442 _ => Json::F64(*self)
2447 impl ToJson for () {
2448 fn to_json(&self) -> Json { Json::Null }
2451 impl ToJson for bool {
2452 fn to_json(&self) -> Json { Json::Boolean(*self) }
2455 impl ToJson for str {
2456 fn to_json(&self) -> Json { Json::String(self.to_string()) }
2459 impl ToJson for string::String {
2460 fn to_json(&self) -> Json { Json::String((*self).clone()) }
2463 macro_rules! tuple_impl {
2464 // use variables to indicate the arity of the tuple
2465 ($($tyvar:ident),* ) => {
2466 // the trailing commas are for the 1 tuple
2468 $( $tyvar : ToJson ),*
2469 > ToJson for ( $( $tyvar ),* , ) {
2472 #[allow(non_snake_case)]
2473 fn to_json(&self) -> Json {
2475 ($(ref $tyvar),*,) => Json::Array(vec![$($tyvar.to_json()),*])
2484 tuple_impl!{A, B, C}
2485 tuple_impl!{A, B, C, D}
2486 tuple_impl!{A, B, C, D, E}
2487 tuple_impl!{A, B, C, D, E, F}
2488 tuple_impl!{A, B, C, D, E, F, G}
2489 tuple_impl!{A, B, C, D, E, F, G, H}
2490 tuple_impl!{A, B, C, D, E, F, G, H, I}
2491 tuple_impl!{A, B, C, D, E, F, G, H, I, J}
2492 tuple_impl!{A, B, C, D, E, F, G, H, I, J, K}
2493 tuple_impl!{A, B, C, D, E, F, G, H, I, J, K, L}
2495 impl<A: ToJson> ToJson for [A] {
2496 fn to_json(&self) -> Json { Json::Array(self.iter().map(|elt| elt.to_json()).collect()) }
2499 impl<A: ToJson> ToJson for Vec<A> {
2500 fn to_json(&self) -> Json { Json::Array(self.iter().map(|elt| elt.to_json()).collect()) }
2503 impl<A: ToJson> ToJson for BTreeMap<string::String, A> {
2504 fn to_json(&self) -> Json {
2505 let mut d = BTreeMap::new();
2506 for (key, value) in self {
2507 d.insert((*key).clone(), value.to_json());
2513 impl<A: ToJson> ToJson for HashMap<string::String, A> {
2514 fn to_json(&self) -> Json {
2515 let mut d = BTreeMap::new();
2516 for (key, value) in self {
2517 d.insert((*key).clone(), value.to_json());
2523 impl<A:ToJson> ToJson for Option<A> {
2524 fn to_json(&self) -> Json {
2527 Some(ref value) => value.to_json()
2532 struct FormatShim<'a, 'b: 'a> {
2533 inner: &'a mut fmt::Formatter<'b>,
2536 impl<'a, 'b> fmt::Write for FormatShim<'a, 'b> {
2537 fn write_str(&mut self, s: &str) -> fmt::Result {
2538 match self.inner.write_str(s) {
2540 Err(_) => Err(fmt::Error)
2545 impl fmt::Display for Json {
2546 /// Encodes a json value into a string
2547 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
2548 let mut shim = FormatShim { inner: f };
2549 let mut encoder = Encoder::new(&mut shim);
2550 match self.encode(&mut encoder) {
2552 Err(_) => Err(fmt::Error)
2557 impl<'a> fmt::Display for PrettyJson<'a> {
2558 /// Encodes a json value into a string
2559 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
2560 let mut shim = FormatShim { inner: f };
2561 let mut encoder = PrettyEncoder::new(&mut shim);
2562 match self.inner.encode(&mut encoder) {
2564 Err(_) => Err(fmt::Error)
2569 impl<'a, T: Encodable> fmt::Display for AsJson<'a, T> {
2570 /// Encodes a json value into a string
2571 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
2572 let mut shim = FormatShim { inner: f };
2573 let mut encoder = Encoder::new(&mut shim);
2574 match self.inner.encode(&mut encoder) {
2576 Err(_) => Err(fmt::Error)
2581 impl<'a, T> AsPrettyJson<'a, T> {
2582 /// Set the indentation level for the emitted JSON
2583 pub fn indent(mut self, indent: usize) -> AsPrettyJson<'a, T> {
2584 self.indent = Some(indent);
2589 impl<'a, T: Encodable> fmt::Display for AsPrettyJson<'a, T> {
2590 /// Encodes a json value into a string
2591 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
2592 let mut shim = FormatShim { inner: f };
2593 let mut encoder = PrettyEncoder::new(&mut shim);
2595 Some(n) => encoder.set_indent(n),
2598 match self.inner.encode(&mut encoder) {
2600 Err(_) => Err(fmt::Error)
2605 impl FromStr for Json {
2606 type Err = BuilderError;
2607 fn from_str(s: &str) -> Result<Json, BuilderError> {
2615 use self::Animal::*;
2616 use self::DecodeEnum::*;
2617 use self::test::Bencher;
2618 use {Encodable, Decodable};
2620 use super::ErrorCode::*;
2621 use super::ParserError::*;
2622 use super::DecoderError::*;
2623 use super::JsonEvent::*;
2624 use super::{Json, from_str, DecodeResult, DecoderError, JsonEvent, Parser,
2625 StackElement, Stack, Decoder, Encoder, EncoderError};
2626 use std::{i64, u64, f32, f64};
2627 use std::collections::BTreeMap;
2629 use std::old_io::Writer;
2631 #[derive(RustcDecodable, Eq, PartialEq, Debug)]
2637 fn test_decode_option_none() {
2639 let obj: OptionData = super::decode(s).unwrap();
2640 assert_eq!(obj, OptionData { opt: None });
2644 fn test_decode_option_some() {
2645 let s = "{ \"opt\": 10 }";
2646 let obj: OptionData = super::decode(s).unwrap();
2647 assert_eq!(obj, OptionData { opt: Some(10) });
2651 fn test_decode_option_malformed() {
2652 check_err::<OptionData>("{ \"opt\": [] }",
2653 ExpectedError("Number".to_string(), "[]".to_string()));
2654 check_err::<OptionData>("{ \"opt\": false }",
2655 ExpectedError("Number".to_string(), "false".to_string()));
2658 #[derive(PartialEq, RustcEncodable, RustcDecodable, Debug)]
2661 Frog(string::String, isize)
2664 #[derive(PartialEq, RustcEncodable, RustcDecodable, Debug)]
2668 c: Vec<string::String>,
2671 #[derive(PartialEq, RustcEncodable, RustcDecodable, Debug)]
2676 fn mk_object(items: &[(string::String, Json)]) -> Json {
2677 let mut d = BTreeMap::new();
2681 (ref key, ref value) => { d.insert((*key).clone(), (*value).clone()); },
2689 fn test_from_str_trait() {
2691 assert!(s.parse::<Json>().unwrap() == s.parse().unwrap());
2695 fn test_write_null() {
2696 assert_eq!(Null.to_string(), "null");
2697 assert_eq!(Null.pretty().to_string(), "null");
2701 fn test_write_i64() {
2702 assert_eq!(U64(0).to_string(), "0");
2703 assert_eq!(U64(0).pretty().to_string(), "0");
2705 assert_eq!(U64(1234).to_string(), "1234");
2706 assert_eq!(U64(1234).pretty().to_string(), "1234");
2708 assert_eq!(I64(-5678).to_string(), "-5678");
2709 assert_eq!(I64(-5678).pretty().to_string(), "-5678");
2711 assert_eq!(U64(7650007200025252000).to_string(), "7650007200025252000");
2712 assert_eq!(U64(7650007200025252000).pretty().to_string(), "7650007200025252000");
2716 fn test_write_f64() {
2717 assert_eq!(F64(3.0).to_string(), "3.0");
2718 assert_eq!(F64(3.0).pretty().to_string(), "3.0");
2720 assert_eq!(F64(3.1).to_string(), "3.1");
2721 assert_eq!(F64(3.1).pretty().to_string(), "3.1");
2723 assert_eq!(F64(-1.5).to_string(), "-1.5");
2724 assert_eq!(F64(-1.5).pretty().to_string(), "-1.5");
2726 assert_eq!(F64(0.5).to_string(), "0.5");
2727 assert_eq!(F64(0.5).pretty().to_string(), "0.5");
2729 assert_eq!(F64(f64::NAN).to_string(), "null");
2730 assert_eq!(F64(f64::NAN).pretty().to_string(), "null");
2732 assert_eq!(F64(f64::INFINITY).to_string(), "null");
2733 assert_eq!(F64(f64::INFINITY).pretty().to_string(), "null");
2735 assert_eq!(F64(f64::NEG_INFINITY).to_string(), "null");
2736 assert_eq!(F64(f64::NEG_INFINITY).pretty().to_string(), "null");
2740 fn test_write_str() {
2741 assert_eq!(String("".to_string()).to_string(), "\"\"");
2742 assert_eq!(String("".to_string()).pretty().to_string(), "\"\"");
2744 assert_eq!(String("homura".to_string()).to_string(), "\"homura\"");
2745 assert_eq!(String("madoka".to_string()).pretty().to_string(), "\"madoka\"");
2749 fn test_write_bool() {
2750 assert_eq!(Boolean(true).to_string(), "true");
2751 assert_eq!(Boolean(true).pretty().to_string(), "true");
2753 assert_eq!(Boolean(false).to_string(), "false");
2754 assert_eq!(Boolean(false).pretty().to_string(), "false");
2758 fn test_write_array() {
2759 assert_eq!(Array(vec![]).to_string(), "[]");
2760 assert_eq!(Array(vec![]).pretty().to_string(), "[]");
2762 assert_eq!(Array(vec![Boolean(true)]).to_string(), "[true]");
2764 Array(vec![Boolean(true)]).pretty().to_string(),
2771 let long_test_array = Array(vec![
2774 Array(vec![String("foo\nbar".to_string()), F64(3.5)])]);
2776 assert_eq!(long_test_array.to_string(),
2777 "[false,null,[\"foo\\nbar\",3.5]]");
2779 long_test_array.pretty().to_string(),
2793 fn test_write_object() {
2794 assert_eq!(mk_object(&[]).to_string(), "{}");
2795 assert_eq!(mk_object(&[]).pretty().to_string(), "{}");
2799 ("a".to_string(), Boolean(true))
2804 mk_object(&[("a".to_string(), Boolean(true))]).pretty().to_string(),
2811 let complex_obj = mk_object(&[
2812 ("b".to_string(), Array(vec![
2813 mk_object(&[("c".to_string(), String("\x0c\r".to_string()))]),
2814 mk_object(&[("d".to_string(), String("".to_string()))])
2819 complex_obj.to_string(),
2822 {\"c\":\"\\f\\r\"},\
2828 complex_obj.pretty().to_string(),
2833 \"c\": \"\\f\\r\"\n \
2842 let a = mk_object(&[
2843 ("a".to_string(), Boolean(true)),
2844 ("b".to_string(), Array(vec![
2845 mk_object(&[("c".to_string(), String("\x0c\r".to_string()))]),
2846 mk_object(&[("d".to_string(), String("".to_string()))])
2850 // We can't compare the strings directly because the object fields be
2851 // printed in a different order.
2852 assert_eq!(a.clone(), a.to_string().parse().unwrap());
2853 assert_eq!(a.clone(), a.pretty().to_string().parse().unwrap());
2857 fn test_write_enum() {
2860 format!("{}", super::as_json(&animal)),
2864 format!("{}", super::as_pretty_json(&animal)),
2868 let animal = Frog("Henry".to_string(), 349);
2870 format!("{}", super::as_json(&animal)),
2871 "{\"variant\":\"Frog\",\"fields\":[\"Henry\",349]}"
2874 format!("{}", super::as_pretty_json(&animal)),
2876 \"variant\": \"Frog\",\n \
2885 macro_rules! check_encoder_for_simple {
2886 ($value:expr, $expected:expr) => ({
2887 let s = format!("{}", super::as_json(&$value));
2888 assert_eq!(s, $expected);
2890 let s = format!("{}", super::as_pretty_json(&$value));
2891 assert_eq!(s, $expected);
2896 fn test_write_some() {
2897 check_encoder_for_simple!(Some("jodhpurs".to_string()), "\"jodhpurs\"");
2901 fn test_write_none() {
2902 check_encoder_for_simple!(None::<string::String>, "null");
2906 fn test_write_char() {
2907 check_encoder_for_simple!('a', "\"a\"");
2908 check_encoder_for_simple!('\t', "\"\\t\"");
2909 check_encoder_for_simple!('\u{0000}', "\"\\u0000\"");
2910 check_encoder_for_simple!('\u{001b}', "\"\\u001b\"");
2911 check_encoder_for_simple!('\u{007f}', "\"\\u007f\"");
2912 check_encoder_for_simple!('\u{00a0}', "\"\u{00a0}\"");
2913 check_encoder_for_simple!('\u{abcd}', "\"\u{abcd}\"");
2914 check_encoder_for_simple!('\u{10ffff}', "\"\u{10ffff}\"");
2918 fn test_trailing_characters() {
2919 assert_eq!(from_str("nulla"), Err(SyntaxError(TrailingCharacters, 1, 5)));
2920 assert_eq!(from_str("truea"), Err(SyntaxError(TrailingCharacters, 1, 5)));
2921 assert_eq!(from_str("falsea"), Err(SyntaxError(TrailingCharacters, 1, 6)));
2922 assert_eq!(from_str("1a"), Err(SyntaxError(TrailingCharacters, 1, 2)));
2923 assert_eq!(from_str("[]a"), Err(SyntaxError(TrailingCharacters, 1, 3)));
2924 assert_eq!(from_str("{}a"), Err(SyntaxError(TrailingCharacters, 1, 3)));
2928 fn test_read_identifiers() {
2929 assert_eq!(from_str("n"), Err(SyntaxError(InvalidSyntax, 1, 2)));
2930 assert_eq!(from_str("nul"), Err(SyntaxError(InvalidSyntax, 1, 4)));
2931 assert_eq!(from_str("t"), Err(SyntaxError(InvalidSyntax, 1, 2)));
2932 assert_eq!(from_str("truz"), Err(SyntaxError(InvalidSyntax, 1, 4)));
2933 assert_eq!(from_str("f"), Err(SyntaxError(InvalidSyntax, 1, 2)));
2934 assert_eq!(from_str("faz"), Err(SyntaxError(InvalidSyntax, 1, 3)));
2936 assert_eq!(from_str("null"), Ok(Null));
2937 assert_eq!(from_str("true"), Ok(Boolean(true)));
2938 assert_eq!(from_str("false"), Ok(Boolean(false)));
2939 assert_eq!(from_str(" null "), Ok(Null));
2940 assert_eq!(from_str(" true "), Ok(Boolean(true)));
2941 assert_eq!(from_str(" false "), Ok(Boolean(false)));
2945 fn test_decode_identifiers() {
2946 let v: () = super::decode("null").unwrap();
2949 let v: bool = super::decode("true").unwrap();
2950 assert_eq!(v, true);
2952 let v: bool = super::decode("false").unwrap();
2953 assert_eq!(v, false);
2957 fn test_read_number() {
2958 assert_eq!(from_str("+"), Err(SyntaxError(InvalidSyntax, 1, 1)));
2959 assert_eq!(from_str("."), Err(SyntaxError(InvalidSyntax, 1, 1)));
2960 assert_eq!(from_str("NaN"), Err(SyntaxError(InvalidSyntax, 1, 1)));
2961 assert_eq!(from_str("-"), Err(SyntaxError(InvalidNumber, 1, 2)));
2962 assert_eq!(from_str("00"), Err(SyntaxError(InvalidNumber, 1, 2)));
2963 assert_eq!(from_str("1."), Err(SyntaxError(InvalidNumber, 1, 3)));
2964 assert_eq!(from_str("1e"), Err(SyntaxError(InvalidNumber, 1, 3)));
2965 assert_eq!(from_str("1e+"), Err(SyntaxError(InvalidNumber, 1, 4)));
2967 assert_eq!(from_str("18446744073709551616"), Err(SyntaxError(InvalidNumber, 1, 20)));
2968 assert_eq!(from_str("-9223372036854775809"), Err(SyntaxError(InvalidNumber, 1, 21)));
2970 assert_eq!(from_str("3"), Ok(U64(3)));
2971 assert_eq!(from_str("3.1"), Ok(F64(3.1)));
2972 assert_eq!(from_str("-1.2"), Ok(F64(-1.2)));
2973 assert_eq!(from_str("0.4"), Ok(F64(0.4)));
2974 assert_eq!(from_str("0.4e5"), Ok(F64(0.4e5)));
2975 assert_eq!(from_str("0.4e+15"), Ok(F64(0.4e15)));
2976 assert_eq!(from_str("0.4e-01"), Ok(F64(0.4e-01)));
2977 assert_eq!(from_str(" 3 "), Ok(U64(3)));
2979 assert_eq!(from_str("-9223372036854775808"), Ok(I64(i64::MIN)));
2980 assert_eq!(from_str("9223372036854775807"), Ok(U64(i64::MAX as u64)));
2981 assert_eq!(from_str("18446744073709551615"), Ok(U64(u64::MAX)));
2985 fn test_decode_numbers() {
2986 let v: f64 = super::decode("3").unwrap();
2989 let v: f64 = super::decode("3.1").unwrap();
2992 let v: f64 = super::decode("-1.2").unwrap();
2993 assert_eq!(v, -1.2);
2995 let v: f64 = super::decode("0.4").unwrap();
2998 let v: f64 = super::decode("0.4e5").unwrap();
2999 assert_eq!(v, 0.4e5);
3001 let v: f64 = super::decode("0.4e15").unwrap();
3002 assert_eq!(v, 0.4e15);
3004 let v: f64 = super::decode("0.4e-01").unwrap();
3005 assert_eq!(v, 0.4e-01);
3007 let v: u64 = super::decode("0").unwrap();
3010 let v: u64 = super::decode("18446744073709551615").unwrap();
3011 assert_eq!(v, u64::MAX);
3013 let v: i64 = super::decode("-9223372036854775808").unwrap();
3014 assert_eq!(v, i64::MIN);
3016 let v: i64 = super::decode("9223372036854775807").unwrap();
3017 assert_eq!(v, i64::MAX);
3019 let res: DecodeResult<i64> = super::decode("765.25252");
3020 assert_eq!(res, Err(ExpectedError("Integer".to_string(),
3021 "765.25252".to_string())));
3025 fn test_read_str() {
3026 assert_eq!(from_str("\""), Err(SyntaxError(EOFWhileParsingString, 1, 2)));
3027 assert_eq!(from_str("\"lol"), Err(SyntaxError(EOFWhileParsingString, 1, 5)));
3029 assert_eq!(from_str("\"\""), Ok(String("".to_string())));
3030 assert_eq!(from_str("\"foo\""), Ok(String("foo".to_string())));
3031 assert_eq!(from_str("\"\\\"\""), Ok(String("\"".to_string())));
3032 assert_eq!(from_str("\"\\b\""), Ok(String("\x08".to_string())));
3033 assert_eq!(from_str("\"\\n\""), Ok(String("\n".to_string())));
3034 assert_eq!(from_str("\"\\r\""), Ok(String("\r".to_string())));
3035 assert_eq!(from_str("\"\\t\""), Ok(String("\t".to_string())));
3036 assert_eq!(from_str(" \"foo\" "), Ok(String("foo".to_string())));
3037 assert_eq!(from_str("\"\\u12ab\""), Ok(String("\u{12ab}".to_string())));
3038 assert_eq!(from_str("\"\\uAB12\""), Ok(String("\u{AB12}".to_string())));
3042 fn test_decode_str() {
3043 let s = [("\"\"", ""),
3046 ("\"\\b\"", "\x08"),
3050 ("\"\\u12ab\"", "\u{12ab}"),
3051 ("\"\\uAB12\"", "\u{AB12}")];
3054 let v: string::String = super::decode(i).unwrap();
3060 fn test_read_array() {
3061 assert_eq!(from_str("["), Err(SyntaxError(EOFWhileParsingValue, 1, 2)));
3062 assert_eq!(from_str("[1"), Err(SyntaxError(EOFWhileParsingArray, 1, 3)));
3063 assert_eq!(from_str("[1,"), Err(SyntaxError(EOFWhileParsingValue, 1, 4)));
3064 assert_eq!(from_str("[1,]"), Err(SyntaxError(InvalidSyntax, 1, 4)));
3065 assert_eq!(from_str("[6 7]"), Err(SyntaxError(InvalidSyntax, 1, 4)));
3067 assert_eq!(from_str("[]"), Ok(Array(vec![])));
3068 assert_eq!(from_str("[ ]"), Ok(Array(vec![])));
3069 assert_eq!(from_str("[true]"), Ok(Array(vec![Boolean(true)])));
3070 assert_eq!(from_str("[ false ]"), Ok(Array(vec![Boolean(false)])));
3071 assert_eq!(from_str("[null]"), Ok(Array(vec![Null])));
3072 assert_eq!(from_str("[3, 1]"),
3073 Ok(Array(vec![U64(3), U64(1)])));
3074 assert_eq!(from_str("\n[3, 2]\n"),
3075 Ok(Array(vec![U64(3), U64(2)])));
3076 assert_eq!(from_str("[2, [4, 1]]"),
3077 Ok(Array(vec![U64(2), Array(vec![U64(4), U64(1)])])));
3081 fn test_decode_array() {
3082 let v: Vec<()> = super::decode("[]").unwrap();
3085 let v: Vec<()> = super::decode("[null]").unwrap();
3086 assert_eq!(v, [()]);
3088 let v: Vec<bool> = super::decode("[true]").unwrap();
3089 assert_eq!(v, [true]);
3091 let v: Vec<isize> = super::decode("[3, 1]").unwrap();
3092 assert_eq!(v, [3, 1]);
3094 let v: Vec<Vec<usize>> = super::decode("[[3], [1, 2]]").unwrap();
3095 assert_eq!(v, [vec![3], vec![1, 2]]);
3099 fn test_decode_tuple() {
3100 let t: (usize, usize, usize) = super::decode("[1, 2, 3]").unwrap();
3101 assert_eq!(t, (1, 2, 3));
3103 let t: (usize, string::String) = super::decode("[1, \"two\"]").unwrap();
3104 assert_eq!(t, (1, "two".to_string()));
3108 fn test_decode_tuple_malformed_types() {
3109 assert!(super::decode::<(usize, string::String)>("[1, 2]").is_err());
3113 fn test_decode_tuple_malformed_length() {
3114 assert!(super::decode::<(usize, usize)>("[1, 2, 3]").is_err());
3118 fn test_read_object() {
3119 assert_eq!(from_str("{"), Err(SyntaxError(EOFWhileParsingObject, 1, 2)));
3120 assert_eq!(from_str("{ "), Err(SyntaxError(EOFWhileParsingObject, 1, 3)));
3121 assert_eq!(from_str("{1"), Err(SyntaxError(KeyMustBeAString, 1, 2)));
3122 assert_eq!(from_str("{ \"a\""), Err(SyntaxError(EOFWhileParsingObject, 1, 6)));
3123 assert_eq!(from_str("{\"a\""), Err(SyntaxError(EOFWhileParsingObject, 1, 5)));
3124 assert_eq!(from_str("{\"a\" "), Err(SyntaxError(EOFWhileParsingObject, 1, 6)));
3126 assert_eq!(from_str("{\"a\" 1"), Err(SyntaxError(ExpectedColon, 1, 6)));
3127 assert_eq!(from_str("{\"a\":"), Err(SyntaxError(EOFWhileParsingValue, 1, 6)));
3128 assert_eq!(from_str("{\"a\":1"), Err(SyntaxError(EOFWhileParsingObject, 1, 7)));
3129 assert_eq!(from_str("{\"a\":1 1"), Err(SyntaxError(InvalidSyntax, 1, 8)));
3130 assert_eq!(from_str("{\"a\":1,"), Err(SyntaxError(EOFWhileParsingObject, 1, 8)));
3132 assert_eq!(from_str("{}").unwrap(), mk_object(&[]));
3133 assert_eq!(from_str("{\"a\": 3}").unwrap(),
3134 mk_object(&[("a".to_string(), U64(3))]));
3136 assert_eq!(from_str(
3137 "{ \"a\": null, \"b\" : true }").unwrap(),
3139 ("a".to_string(), Null),
3140 ("b".to_string(), Boolean(true))]));
3141 assert_eq!(from_str("\n{ \"a\": null, \"b\" : true }\n").unwrap(),
3143 ("a".to_string(), Null),
3144 ("b".to_string(), Boolean(true))]));
3145 assert_eq!(from_str(
3146 "{\"a\" : 1.0 ,\"b\": [ true ]}").unwrap(),
3148 ("a".to_string(), F64(1.0)),
3149 ("b".to_string(), Array(vec![Boolean(true)]))
3151 assert_eq!(from_str(
3157 { \"c\": {\"d\": null} } \
3161 ("a".to_string(), F64(1.0)),
3162 ("b".to_string(), Array(vec![
3164 String("foo\nbar".to_string()),
3166 ("c".to_string(), mk_object(&[("d".to_string(), Null)]))
3173 fn test_decode_struct() {
3176 { \"a\": null, \"b\": 2, \"c\": [\"abc\", \"xyz\"] }
3180 let v: Outer = super::decode(s).unwrap();
3185 Inner { a: (), b: 2, c: vec!["abc".to_string(), "xyz".to_string()] }
3191 #[derive(RustcDecodable)]
3192 struct FloatStruct {
3197 fn test_decode_struct_with_nan() {
3198 let s = "{\"f\":null,\"a\":[null,123]}";
3199 let obj: FloatStruct = super::decode(s).unwrap();
3200 assert!(obj.f.is_nan());
3201 assert!(obj.a[0].is_nan());
3202 assert_eq!(obj.a[1], 123f64);
3206 fn test_decode_option() {
3207 let value: Option<string::String> = super::decode("null").unwrap();
3208 assert_eq!(value, None);
3210 let value: Option<string::String> = super::decode("\"jodhpurs\"").unwrap();
3211 assert_eq!(value, Some("jodhpurs".to_string()));
3215 fn test_decode_enum() {
3216 let value: Animal = super::decode("\"Dog\"").unwrap();
3217 assert_eq!(value, Dog);
3219 let s = "{\"variant\":\"Frog\",\"fields\":[\"Henry\",349]}";
3220 let value: Animal = super::decode(s).unwrap();
3221 assert_eq!(value, Frog("Henry".to_string(), 349));
3225 fn test_decode_map() {
3226 let s = "{\"a\": \"Dog\", \"b\": {\"variant\":\"Frog\",\
3227 \"fields\":[\"Henry\", 349]}}";
3228 let mut map: BTreeMap<string::String, Animal> = super::decode(s).unwrap();
3230 assert_eq!(map.remove(&"a".to_string()), Some(Dog));
3231 assert_eq!(map.remove(&"b".to_string()), Some(Frog("Henry".to_string(), 349)));
3235 fn test_multiline_errors() {
3236 assert_eq!(from_str("{\n \"foo\":\n \"bar\""),
3237 Err(SyntaxError(EOFWhileParsingObject, 3, 8)));
3240 #[derive(RustcDecodable)]
3242 struct DecodeStruct {
3246 w: Vec<DecodeStruct>
3248 #[derive(RustcDecodable)]
3253 fn check_err<T: Decodable>(to_parse: &'static str, expected: DecoderError) {
3254 let res: DecodeResult<T> = match from_str(to_parse) {
3255 Err(e) => Err(ParseError(e)),
3256 Ok(json) => Decodable::decode(&mut Decoder::new(json))
3259 Ok(_) => panic!("`{:?}` parsed & decoded ok, expecting error `{:?}`",
3260 to_parse, expected),
3261 Err(ParseError(e)) => panic!("`{:?}` is not valid json: {:?}",
3264 assert_eq!(e, expected);
3269 fn test_decode_errors_struct() {
3270 check_err::<DecodeStruct>("[]", ExpectedError("Object".to_string(), "[]".to_string()));
3271 check_err::<DecodeStruct>("{\"x\": true, \"y\": true, \"z\": \"\", \"w\": []}",
3272 ExpectedError("Number".to_string(), "true".to_string()));
3273 check_err::<DecodeStruct>("{\"x\": 1, \"y\": [], \"z\": \"\", \"w\": []}",
3274 ExpectedError("Boolean".to_string(), "[]".to_string()));
3275 check_err::<DecodeStruct>("{\"x\": 1, \"y\": true, \"z\": {}, \"w\": []}",
3276 ExpectedError("String".to_string(), "{}".to_string()));
3277 check_err::<DecodeStruct>("{\"x\": 1, \"y\": true, \"z\": \"\", \"w\": null}",
3278 ExpectedError("Array".to_string(), "null".to_string()));
3279 check_err::<DecodeStruct>("{\"x\": 1, \"y\": true, \"z\": \"\"}",
3280 MissingFieldError("w".to_string()));
3283 fn test_decode_errors_enum() {
3284 check_err::<DecodeEnum>("{}",
3285 MissingFieldError("variant".to_string()));
3286 check_err::<DecodeEnum>("{\"variant\": 1}",
3287 ExpectedError("String".to_string(), "1".to_string()));
3288 check_err::<DecodeEnum>("{\"variant\": \"A\"}",
3289 MissingFieldError("fields".to_string()));
3290 check_err::<DecodeEnum>("{\"variant\": \"A\", \"fields\": null}",
3291 ExpectedError("Array".to_string(), "null".to_string()));
3292 check_err::<DecodeEnum>("{\"variant\": \"C\", \"fields\": []}",
3293 UnknownVariantError("C".to_string()));
3298 let json_value = from_str("{\"dog\" : \"cat\"}").unwrap();
3299 let found_str = json_value.find("dog");
3300 assert!(found_str.unwrap().as_string().unwrap() == "cat");
3304 fn test_find_path(){
3305 let json_value = from_str("{\"dog\":{\"cat\": {\"mouse\" : \"cheese\"}}}").unwrap();
3306 let found_str = json_value.find_path(&["dog", "cat", "mouse"]);
3307 assert!(found_str.unwrap().as_string().unwrap() == "cheese");
3312 let json_value = from_str("{\"dog\":{\"cat\": {\"mouse\" : \"cheese\"}}}").unwrap();
3313 let found_str = json_value.search("mouse").and_then(|j| j.as_string());
3314 assert!(found_str.unwrap() == "cheese");
3319 let json_value = from_str("{\"animals\":[\"dog\",\"cat\",\"mouse\"]}").unwrap();
3320 let ref array = json_value["animals"];
3321 assert_eq!(array[0].as_string().unwrap(), "dog");
3322 assert_eq!(array[1].as_string().unwrap(), "cat");
3323 assert_eq!(array[2].as_string().unwrap(), "mouse");
3327 fn test_is_object(){
3328 let json_value = from_str("{}").unwrap();
3329 assert!(json_value.is_object());
3333 fn test_as_object(){
3334 let json_value = from_str("{}").unwrap();
3335 let json_object = json_value.as_object();
3336 assert!(json_object.is_some());
3341 let json_value = from_str("[1, 2, 3]").unwrap();
3342 assert!(json_value.is_array());
3347 let json_value = from_str("[1, 2, 3]").unwrap();
3348 let json_array = json_value.as_array();
3349 let expected_length = 3;
3350 assert!(json_array.is_some() && json_array.unwrap().len() == expected_length);
3354 fn test_is_string(){
3355 let json_value = from_str("\"dog\"").unwrap();
3356 assert!(json_value.is_string());
3360 fn test_as_string(){
3361 let json_value = from_str("\"dog\"").unwrap();
3362 let json_str = json_value.as_string();
3363 let expected_str = "dog";
3364 assert_eq!(json_str, Some(expected_str));
3368 fn test_is_number(){
3369 let json_value = from_str("12").unwrap();
3370 assert!(json_value.is_number());
3375 let json_value = from_str("-12").unwrap();
3376 assert!(json_value.is_i64());
3378 let json_value = from_str("12").unwrap();
3379 assert!(!json_value.is_i64());
3381 let json_value = from_str("12.0").unwrap();
3382 assert!(!json_value.is_i64());
3387 let json_value = from_str("12").unwrap();
3388 assert!(json_value.is_u64());
3390 let json_value = from_str("-12").unwrap();
3391 assert!(!json_value.is_u64());
3393 let json_value = from_str("12.0").unwrap();
3394 assert!(!json_value.is_u64());
3399 let json_value = from_str("12").unwrap();
3400 assert!(!json_value.is_f64());
3402 let json_value = from_str("-12").unwrap();
3403 assert!(!json_value.is_f64());
3405 let json_value = from_str("12.0").unwrap();
3406 assert!(json_value.is_f64());
3408 let json_value = from_str("-12.0").unwrap();
3409 assert!(json_value.is_f64());
3414 let json_value = from_str("-12").unwrap();
3415 let json_num = json_value.as_i64();
3416 assert_eq!(json_num, Some(-12));
3421 let json_value = from_str("12").unwrap();
3422 let json_num = json_value.as_u64();
3423 assert_eq!(json_num, Some(12));
3428 let json_value = from_str("12.0").unwrap();
3429 let json_num = json_value.as_f64();
3430 assert_eq!(json_num, Some(12f64));
3434 fn test_is_boolean(){
3435 let json_value = from_str("false").unwrap();
3436 assert!(json_value.is_boolean());
3440 fn test_as_boolean(){
3441 let json_value = from_str("false").unwrap();
3442 let json_bool = json_value.as_boolean();
3443 let expected_bool = false;
3444 assert!(json_bool.is_some() && json_bool.unwrap() == expected_bool);
3449 let json_value = from_str("null").unwrap();
3450 assert!(json_value.is_null());
3455 let json_value = from_str("null").unwrap();
3456 let json_null = json_value.as_null();
3457 let expected_null = ();
3458 assert!(json_null.is_some() && json_null.unwrap() == expected_null);
3462 fn test_encode_hashmap_with_numeric_key() {
3463 use std::str::from_utf8;
3464 use std::old_io::Writer;
3465 use std::collections::HashMap;
3466 let mut hm: HashMap<usize, bool> = HashMap::new();
3468 let mut mem_buf = Vec::new();
3469 write!(&mut mem_buf, "{}", super::as_pretty_json(&hm)).unwrap();
3470 let json_str = from_utf8(&mem_buf[..]).unwrap();
3471 match from_str(json_str) {
3472 Err(_) => panic!("Unable to parse json_str: {:?}", json_str),
3473 _ => {} // it parsed and we are good to go
3478 fn test_prettyencode_hashmap_with_numeric_key() {
3479 use std::str::from_utf8;
3480 use std::old_io::Writer;
3481 use std::collections::HashMap;
3482 let mut hm: HashMap<usize, bool> = HashMap::new();
3484 let mut mem_buf = Vec::new();
3485 write!(&mut mem_buf, "{}", super::as_pretty_json(&hm)).unwrap();
3486 let json_str = from_utf8(&mem_buf[..]).unwrap();
3487 match from_str(json_str) {
3488 Err(_) => panic!("Unable to parse json_str: {:?}", json_str),
3489 _ => {} // it parsed and we are good to go
3494 fn test_prettyencoder_indent_level_param() {
3495 use std::str::from_utf8;
3496 use std::collections::BTreeMap;
3498 let mut tree = BTreeMap::new();
3500 tree.insert("hello".to_string(), String("guten tag".to_string()));
3501 tree.insert("goodbye".to_string(), String("sayonara".to_string()));
3504 // The following layout below should look a lot like
3505 // the pretty-printed JSON (indent * x)
3508 String("greetings".to_string()), // 1x
3509 Object(tree), // 1x + 2x + 2x + 1x
3511 // End JSON array (7 lines)
3514 // Helper function for counting indents
3515 fn indents(source: &str) -> usize {
3516 let trimmed = source.trim_left_matches(' ');
3517 source.len() - trimmed.len()
3520 // Test up to 4 spaces of indents (more?)
3522 let mut writer = Vec::new();
3523 write!(&mut writer, "{}",
3524 super::as_pretty_json(&json).indent(i)).unwrap();
3526 let printed = from_utf8(&writer[..]).unwrap();
3528 // Check for indents at each line
3529 let lines: Vec<&str> = printed.lines().collect();
3530 assert_eq!(lines.len(), 7); // JSON should be 7 lines
3532 assert_eq!(indents(lines[0]), 0 * i); // [
3533 assert_eq!(indents(lines[1]), 1 * i); // "greetings",
3534 assert_eq!(indents(lines[2]), 1 * i); // {
3535 assert_eq!(indents(lines[3]), 2 * i); // "hello": "guten tag",
3536 assert_eq!(indents(lines[4]), 2 * i); // "goodbye": "sayonara"
3537 assert_eq!(indents(lines[5]), 1 * i); // },
3538 assert_eq!(indents(lines[6]), 0 * i); // ]
3540 // Finally, test that the pretty-printed JSON is valid
3541 from_str(printed).ok().expect("Pretty-printed JSON is invalid!");
3546 fn test_hashmap_with_enum_key() {
3547 use std::collections::HashMap;
3549 #[derive(RustcEncodable, Eq, Hash, PartialEq, RustcDecodable, Debug)]
3555 let mut map = HashMap::new();
3556 map.insert(Enum::Foo, 0);
3557 let result = json::encode(&map).unwrap();
3558 assert_eq!(&result[..], r#"{"Foo":0}"#);
3559 let decoded: HashMap<Enum, _> = json::decode(&result).unwrap();
3560 assert_eq!(map, decoded);
3564 fn test_hashmap_with_numeric_key_can_handle_double_quote_delimited_key() {
3565 use std::collections::HashMap;
3567 let json_str = "{\"1\":true}";
3568 let json_obj = match from_str(json_str) {
3569 Err(_) => panic!("Unable to parse json_str: {:?}", json_str),
3572 let mut decoder = Decoder::new(json_obj);
3573 let _hm: HashMap<usize, bool> = Decodable::decode(&mut decoder).unwrap();
3577 fn test_hashmap_with_numeric_key_will_error_with_string_keys() {
3578 use std::collections::HashMap;
3580 let json_str = "{\"a\":true}";
3581 let json_obj = match from_str(json_str) {
3582 Err(_) => panic!("Unable to parse json_str: {:?}", json_str),
3585 let mut decoder = Decoder::new(json_obj);
3586 let result: Result<HashMap<usize, bool>, DecoderError> = Decodable::decode(&mut decoder);
3587 assert_eq!(result, Err(ExpectedError("Number".to_string(), "a".to_string())));
3590 fn assert_stream_equal(src: &str,
3591 expected: Vec<(JsonEvent, Vec<StackElement>)>) {
3592 let mut parser = Parser::new(src.chars());
3595 let evt = match parser.next() {
3599 let (ref expected_evt, ref expected_stack) = expected[i];
3600 if !parser.stack().is_equal_to(expected_stack) {
3601 panic!("Parser stack is not equal to {:?}", expected_stack);
3603 assert_eq!(&evt, expected_evt);
3608 #[cfg_attr(target_pointer_width = "32", ignore)] // FIXME(#14064)
3609 fn test_streaming_parser() {
3610 assert_stream_equal(
3611 r#"{ "foo":"bar", "array" : [0, 1, 2, 3, 4, 5], "idents":[null,true,false]}"#,
3613 (ObjectStart, vec![]),
3614 (StringValue("bar".to_string()), vec![StackElement::Key("foo")]),
3615 (ArrayStart, vec![StackElement::Key("array")]),
3616 (U64Value(0), vec![StackElement::Key("array"), StackElement::Index(0)]),
3617 (U64Value(1), vec![StackElement::Key("array"), StackElement::Index(1)]),
3618 (U64Value(2), vec![StackElement::Key("array"), StackElement::Index(2)]),
3619 (U64Value(3), vec![StackElement::Key("array"), StackElement::Index(3)]),
3620 (U64Value(4), vec![StackElement::Key("array"), StackElement::Index(4)]),
3621 (U64Value(5), vec![StackElement::Key("array"), StackElement::Index(5)]),
3622 (ArrayEnd, vec![StackElement::Key("array")]),
3623 (ArrayStart, vec![StackElement::Key("idents")]),
3624 (NullValue, vec![StackElement::Key("idents"),
3625 StackElement::Index(0)]),
3626 (BooleanValue(true), vec![StackElement::Key("idents"),
3627 StackElement::Index(1)]),
3628 (BooleanValue(false), vec![StackElement::Key("idents"),
3629 StackElement::Index(2)]),
3630 (ArrayEnd, vec![StackElement::Key("idents")]),
3631 (ObjectEnd, vec![]),
3635 fn last_event(src: &str) -> JsonEvent {
3636 let mut parser = Parser::new(src.chars());
3637 let mut evt = NullValue;
3639 evt = match parser.next() {
3647 #[cfg_attr(target_pointer_width = "32", ignore)] // FIXME(#14064)
3648 fn test_read_object_streaming() {
3649 assert_eq!(last_event("{ "), Error(SyntaxError(EOFWhileParsingObject, 1, 3)));
3650 assert_eq!(last_event("{1"), Error(SyntaxError(KeyMustBeAString, 1, 2)));
3651 assert_eq!(last_event("{ \"a\""), Error(SyntaxError(EOFWhileParsingObject, 1, 6)));
3652 assert_eq!(last_event("{\"a\""), Error(SyntaxError(EOFWhileParsingObject, 1, 5)));
3653 assert_eq!(last_event("{\"a\" "), Error(SyntaxError(EOFWhileParsingObject, 1, 6)));
3655 assert_eq!(last_event("{\"a\" 1"), Error(SyntaxError(ExpectedColon, 1, 6)));
3656 assert_eq!(last_event("{\"a\":"), Error(SyntaxError(EOFWhileParsingValue, 1, 6)));
3657 assert_eq!(last_event("{\"a\":1"), Error(SyntaxError(EOFWhileParsingObject, 1, 7)));
3658 assert_eq!(last_event("{\"a\":1 1"), Error(SyntaxError(InvalidSyntax, 1, 8)));
3659 assert_eq!(last_event("{\"a\":1,"), Error(SyntaxError(EOFWhileParsingObject, 1, 8)));
3660 assert_eq!(last_event("{\"a\":1,}"), Error(SyntaxError(TrailingComma, 1, 8)));
3662 assert_stream_equal(
3664 vec![(ObjectStart, vec![]), (ObjectEnd, vec![])]
3666 assert_stream_equal(
3669 (ObjectStart, vec![]),
3670 (U64Value(3), vec![StackElement::Key("a")]),
3671 (ObjectEnd, vec![]),
3674 assert_stream_equal(
3675 "{ \"a\": null, \"b\" : true }",
3677 (ObjectStart, vec![]),
3678 (NullValue, vec![StackElement::Key("a")]),
3679 (BooleanValue(true), vec![StackElement::Key("b")]),
3680 (ObjectEnd, vec![]),
3683 assert_stream_equal(
3684 "{\"a\" : 1.0 ,\"b\": [ true ]}",
3686 (ObjectStart, vec![]),
3687 (F64Value(1.0), vec![StackElement::Key("a")]),
3688 (ArrayStart, vec![StackElement::Key("b")]),
3689 (BooleanValue(true),vec![StackElement::Key("b"), StackElement::Index(0)]),
3690 (ArrayEnd, vec![StackElement::Key("b")]),
3691 (ObjectEnd, vec![]),
3694 assert_stream_equal(
3700 { "c": {"d": null} }
3704 (ObjectStart, vec![]),
3705 (F64Value(1.0), vec![StackElement::Key("a")]),
3706 (ArrayStart, vec![StackElement::Key("b")]),
3707 (BooleanValue(true), vec![StackElement::Key("b"),
3708 StackElement::Index(0)]),
3709 (StringValue("foo\nbar".to_string()), vec![StackElement::Key("b"),
3710 StackElement::Index(1)]),
3711 (ObjectStart, vec![StackElement::Key("b"),
3712 StackElement::Index(2)]),
3713 (ObjectStart, vec![StackElement::Key("b"),
3714 StackElement::Index(2),
3715 StackElement::Key("c")]),
3716 (NullValue, vec![StackElement::Key("b"),
3717 StackElement::Index(2),
3718 StackElement::Key("c"),
3719 StackElement::Key("d")]),
3720 (ObjectEnd, vec![StackElement::Key("b"),
3721 StackElement::Index(2),
3722 StackElement::Key("c")]),
3723 (ObjectEnd, vec![StackElement::Key("b"),
3724 StackElement::Index(2)]),
3725 (ArrayEnd, vec![StackElement::Key("b")]),
3726 (ObjectEnd, vec![]),
3731 #[cfg_attr(target_pointer_width = "32", ignore)] // FIXME(#14064)
3732 fn test_read_array_streaming() {
3733 assert_stream_equal(
3736 (ArrayStart, vec![]),
3740 assert_stream_equal(
3743 (ArrayStart, vec![]),
3747 assert_stream_equal(
3750 (ArrayStart, vec![]),
3751 (BooleanValue(true), vec![StackElement::Index(0)]),
3755 assert_stream_equal(
3758 (ArrayStart, vec![]),
3759 (BooleanValue(false), vec![StackElement::Index(0)]),
3763 assert_stream_equal(
3766 (ArrayStart, vec![]),
3767 (NullValue, vec![StackElement::Index(0)]),
3771 assert_stream_equal(
3774 (ArrayStart, vec![]),
3775 (U64Value(3), vec![StackElement::Index(0)]),
3776 (U64Value(1), vec![StackElement::Index(1)]),
3780 assert_stream_equal(
3783 (ArrayStart, vec![]),
3784 (U64Value(3), vec![StackElement::Index(0)]),
3785 (U64Value(2), vec![StackElement::Index(1)]),
3789 assert_stream_equal(
3792 (ArrayStart, vec![]),
3793 (U64Value(2), vec![StackElement::Index(0)]),
3794 (ArrayStart, vec![StackElement::Index(1)]),
3795 (U64Value(4), vec![StackElement::Index(1), StackElement::Index(0)]),
3796 (U64Value(1), vec![StackElement::Index(1), StackElement::Index(1)]),
3797 (ArrayEnd, vec![StackElement::Index(1)]),
3802 assert_eq!(last_event("["), Error(SyntaxError(EOFWhileParsingValue, 1, 2)));
3804 assert_eq!(from_str("["), Err(SyntaxError(EOFWhileParsingValue, 1, 2)));
3805 assert_eq!(from_str("[1"), Err(SyntaxError(EOFWhileParsingArray, 1, 3)));
3806 assert_eq!(from_str("[1,"), Err(SyntaxError(EOFWhileParsingValue, 1, 4)));
3807 assert_eq!(from_str("[1,]"), Err(SyntaxError(InvalidSyntax, 1, 4)));
3808 assert_eq!(from_str("[6 7]"), Err(SyntaxError(InvalidSyntax, 1, 4)));
3812 fn test_trailing_characters_streaming() {
3813 assert_eq!(last_event("nulla"), Error(SyntaxError(TrailingCharacters, 1, 5)));
3814 assert_eq!(last_event("truea"), Error(SyntaxError(TrailingCharacters, 1, 5)));
3815 assert_eq!(last_event("falsea"), Error(SyntaxError(TrailingCharacters, 1, 6)));
3816 assert_eq!(last_event("1a"), Error(SyntaxError(TrailingCharacters, 1, 2)));
3817 assert_eq!(last_event("[]a"), Error(SyntaxError(TrailingCharacters, 1, 3)));
3818 assert_eq!(last_event("{}a"), Error(SyntaxError(TrailingCharacters, 1, 3)));
3821 fn test_read_identifiers_streaming() {
3822 assert_eq!(Parser::new("null".chars()).next(), Some(NullValue));
3823 assert_eq!(Parser::new("true".chars()).next(), Some(BooleanValue(true)));
3824 assert_eq!(Parser::new("false".chars()).next(), Some(BooleanValue(false)));
3826 assert_eq!(last_event("n"), Error(SyntaxError(InvalidSyntax, 1, 2)));
3827 assert_eq!(last_event("nul"), Error(SyntaxError(InvalidSyntax, 1, 4)));
3828 assert_eq!(last_event("t"), Error(SyntaxError(InvalidSyntax, 1, 2)));
3829 assert_eq!(last_event("truz"), Error(SyntaxError(InvalidSyntax, 1, 4)));
3830 assert_eq!(last_event("f"), Error(SyntaxError(InvalidSyntax, 1, 2)));
3831 assert_eq!(last_event("faz"), Error(SyntaxError(InvalidSyntax, 1, 3)));
3836 let mut stack = Stack::new();
3838 assert!(stack.is_empty());
3839 assert!(stack.len() == 0);
3840 assert!(!stack.last_is_index());
3842 stack.push_index(0);
3845 assert!(stack.len() == 1);
3846 assert!(stack.is_equal_to(&[StackElement::Index(1)]));
3847 assert!(stack.starts_with(&[StackElement::Index(1)]));
3848 assert!(stack.ends_with(&[StackElement::Index(1)]));
3849 assert!(stack.last_is_index());
3850 assert!(stack.get(0) == StackElement::Index(1));
3852 stack.push_key("foo".to_string());
3854 assert!(stack.len() == 2);
3855 assert!(stack.is_equal_to(&[StackElement::Index(1), StackElement::Key("foo")]));
3856 assert!(stack.starts_with(&[StackElement::Index(1), StackElement::Key("foo")]));
3857 assert!(stack.starts_with(&[StackElement::Index(1)]));
3858 assert!(stack.ends_with(&[StackElement::Index(1), StackElement::Key("foo")]));
3859 assert!(stack.ends_with(&[StackElement::Key("foo")]));
3860 assert!(!stack.last_is_index());
3861 assert!(stack.get(0) == StackElement::Index(1));
3862 assert!(stack.get(1) == StackElement::Key("foo"));
3864 stack.push_key("bar".to_string());
3866 assert!(stack.len() == 3);
3867 assert!(stack.is_equal_to(&[StackElement::Index(1),
3868 StackElement::Key("foo"),
3869 StackElement::Key("bar")]));
3870 assert!(stack.starts_with(&[StackElement::Index(1)]));
3871 assert!(stack.starts_with(&[StackElement::Index(1), StackElement::Key("foo")]));
3872 assert!(stack.starts_with(&[StackElement::Index(1),
3873 StackElement::Key("foo"),
3874 StackElement::Key("bar")]));
3875 assert!(stack.ends_with(&[StackElement::Key("bar")]));
3876 assert!(stack.ends_with(&[StackElement::Key("foo"), StackElement::Key("bar")]));
3877 assert!(stack.ends_with(&[StackElement::Index(1),
3878 StackElement::Key("foo"),
3879 StackElement::Key("bar")]));
3880 assert!(!stack.last_is_index());
3881 assert!(stack.get(0) == StackElement::Index(1));
3882 assert!(stack.get(1) == StackElement::Key("foo"));
3883 assert!(stack.get(2) == StackElement::Key("bar"));
3887 assert!(stack.len() == 2);
3888 assert!(stack.is_equal_to(&[StackElement::Index(1), StackElement::Key("foo")]));
3889 assert!(stack.starts_with(&[StackElement::Index(1), StackElement::Key("foo")]));
3890 assert!(stack.starts_with(&[StackElement::Index(1)]));
3891 assert!(stack.ends_with(&[StackElement::Index(1), StackElement::Key("foo")]));
3892 assert!(stack.ends_with(&[StackElement::Key("foo")]));
3893 assert!(!stack.last_is_index());
3894 assert!(stack.get(0) == StackElement::Index(1));
3895 assert!(stack.get(1) == StackElement::Key("foo"));
3900 use std::collections::{HashMap,BTreeMap};
3903 let array2 = Array(vec!(U64(1), U64(2)));
3904 let array3 = Array(vec!(U64(1), U64(2), U64(3)));
3906 let mut tree_map = BTreeMap::new();
3907 tree_map.insert("a".to_string(), U64(1));
3908 tree_map.insert("b".to_string(), U64(2));
3912 assert_eq!(array2.to_json(), array2);
3913 assert_eq!(object.to_json(), object);
3914 assert_eq!(3_isize.to_json(), I64(3));
3915 assert_eq!(4_i8.to_json(), I64(4));
3916 assert_eq!(5_i16.to_json(), I64(5));
3917 assert_eq!(6_i32.to_json(), I64(6));
3918 assert_eq!(7_i64.to_json(), I64(7));
3919 assert_eq!(8_usize.to_json(), U64(8));
3920 assert_eq!(9_u8.to_json(), U64(9));
3921 assert_eq!(10_u16.to_json(), U64(10));
3922 assert_eq!(11_u32.to_json(), U64(11));
3923 assert_eq!(12_u64.to_json(), U64(12));
3924 assert_eq!(13.0_f32.to_json(), F64(13.0_f64));
3925 assert_eq!(14.0_f64.to_json(), F64(14.0_f64));
3926 assert_eq!(().to_json(), Null);
3927 assert_eq!(f32::INFINITY.to_json(), Null);
3928 assert_eq!(f64::NAN.to_json(), Null);
3929 assert_eq!(true.to_json(), Boolean(true));
3930 assert_eq!(false.to_json(), Boolean(false));
3931 assert_eq!("abc".to_json(), String("abc".to_string()));
3932 assert_eq!("abc".to_string().to_json(), String("abc".to_string()));
3933 assert_eq!((1_usize, 2_usize).to_json(), array2);
3934 assert_eq!((1_usize, 2_usize, 3_usize).to_json(), array3);
3935 assert_eq!([1_usize, 2_usize].to_json(), array2);
3936 assert_eq!((&[1_usize, 2_usize, 3_usize]).to_json(), array3);
3937 assert_eq!((vec![1_usize, 2_usize]).to_json(), array2);
3938 assert_eq!(vec!(1_usize, 2_usize, 3_usize).to_json(), array3);
3939 let mut tree_map = BTreeMap::new();
3940 tree_map.insert("a".to_string(), 1 as usize);
3941 tree_map.insert("b".to_string(), 2);
3942 assert_eq!(tree_map.to_json(), object);
3943 let mut hash_map = HashMap::new();
3944 hash_map.insert("a".to_string(), 1 as usize);
3945 hash_map.insert("b".to_string(), 2);
3946 assert_eq!(hash_map.to_json(), object);
3947 assert_eq!(Some(15).to_json(), I64(15));
3948 assert_eq!(Some(15 as usize).to_json(), U64(15));
3949 assert_eq!(None::<isize>.to_json(), Null);
3953 fn test_encode_hashmap_with_arbitrary_key() {
3954 use std::collections::HashMap;
3955 #[derive(PartialEq, Eq, Hash, RustcEncodable)]
3956 struct ArbitraryType(usize);
3957 let mut hm: HashMap<ArbitraryType, bool> = HashMap::new();
3958 hm.insert(ArbitraryType(1), true);
3959 let mut mem_buf = string::String::new();
3960 let mut encoder = Encoder::new(&mut mem_buf);
3961 let result = hm.encode(&mut encoder);
3962 match result.err().unwrap() {
3963 EncoderError::BadHashmapKey => (),
3964 _ => panic!("expected bad hash map key")
3969 fn bench_streaming_small(b: &mut Bencher) {
3971 let mut parser = Parser::new(
3977 { "c": {"d": null} }
3982 match parser.next() {
3990 fn bench_small(b: &mut Bencher) {
3992 let _ = from_str(r#"{
3997 { "c": {"d": null} }
4003 fn big_json() -> string::String {
4004 let mut src = "[\n".to_string();
4006 src.push_str(r#"{ "a": true, "b": null, "c":3.1415, "d": "Hello world", "e": \
4009 src.push_str("{}]");
4014 fn bench_streaming_large(b: &mut Bencher) {
4015 let src = big_json();
4017 let mut parser = Parser::new(src.chars());
4019 match parser.next() {
4027 fn bench_large(b: &mut Bencher) {
4028 let src = big_json();
4029 b.iter( || { let _ = from_str(&src); });