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[..]).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, str}
;
212 use rustc_unicode
::str as unicode_str
;
213 use rustc_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, Clone, 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 From
<fmt
::Error
> for EncoderError
{
369 fn from(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 => v.to_string(),
462 _ => v.to_string() + ".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) => Some(n as i64),
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) => Some(n as u64),
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) => Some(n as f64),
1186 Json::U64(n) => Some(n as f64),
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).wrapping_neg();
1543 // Make sure we didn't underflow.
1545 Error(SyntaxError(InvalidNumber, self.line, self.col))
1555 #[allow(deprecated)] // possible resolve bug is mapping these to traits
1556 fn parse_u64(&mut self) -> Result<u64, ParserError> {
1557 let mut accum = 0u64;
1558 let last_accum = 0; // necessary to detect overflow.
1560 match self.ch_or_null() {
1564 // A leading '0' must be the only digit before the decimal point.
1565 match self.ch_or_null() {
1566 '0' ... '9' => return self.error(InvalidNumber),
1572 match self.ch_or_null() {
1573 c @ '0' ... '9' => {
1574 accum = accum.wrapping_mul(10);
1575 accum = accum.wrapping_add((c as u64) - ('0' as u64));
1577 // Detect overflow by comparing to the last value.
1578 if accum <= last_accum { return self.error(InvalidNumber); }
1586 _ => return self.error(InvalidNumber),
1592 fn parse_decimal(&mut self, mut res: f64) -> Result<f64, ParserError> {
1595 // Make sure a digit follows the decimal place.
1596 match self.ch_or_null() {
1598 _ => return self.error(InvalidNumber)
1603 match self.ch_or_null() {
1604 c @ '0' ... '9' => {
1606 res += (((c as isize) - ('0' as isize)) as f64) * dec;
1616 fn parse_exponent(&mut self, mut res: f64) -> Result<f64, ParserError> {
1620 let mut neg_exp = false;
1622 if self.ch_is('+') {
1624 } else if self.ch_is('-') {
1629 // Make sure a digit follows the exponent place.
1630 match self.ch_or_null() {
1632 _ => return self.error(InvalidNumber)
1635 match self.ch_or_null() {
1636 c @ '0' ... '9' => {
1638 exp += (c as usize) - ('0' as usize);
1646 let exp = 10_f64.powi(exp as i32);
1656 fn decode_hex_escape(&mut self) -> Result<u16, ParserError> {
1659 while i < 4 && !self.eof() {
1661 n = match self.ch_or_null() {
1662 c @ '0' ... '9' => n * 16 + ((c as u16) - ('0' as u16)),
1663 'a' | 'A' => n * 16 + 10,
1664 'b' | 'B' => n * 16 + 11,
1665 'c' | 'C' => n * 16 + 12,
1666 'd' | 'D' => n * 16 + 13,
1667 'e' | 'E' => n * 16 + 14,
1668 'f' | 'F' => n * 16 + 15,
1669 _ => return self.error(InvalidEscape)
1675 // Error out if we didn't parse 4 digits.
1677 return self.error(InvalidEscape);
1683 fn parse_str(&mut self) -> Result<string::String, ParserError> {
1684 let mut escape = false;
1685 let mut res = string::String::new();
1690 return self.error(EOFWhileParsingString);
1694 match self.ch_or_null() {
1695 '"'
=> res
.push('
"'),
1696 '\\' => res.push('\\'),
1697 '/' => res.push('/'),
1698 'b' => res.push('\x08'),
1699 'f' => res.push('\x0c'),
1700 'n' => res.push('\n'),
1701 'r' => res.push('\r'),
1702 't' => res.push('\t'),
1703 'u' => match try!(self.decode_hex_escape()) {
1704 0xDC00 ... 0xDFFF => {
1705 return self.error(LoneLeadingSurrogateInHexEscape)
1708 // Non-BMP characters are encoded as a sequence of
1709 // two hex escapes, representing UTF-16 surrogates.
1710 n1 @ 0xD800 ... 0xDBFF => {
1711 match (self.next_char(), self.next_char()) {
1712 (Some('\\'), Some('u')) => (),
1713 _ => return self.error(UnexpectedEndOfHexEscape),
1716 let buf = [n1, try!(self.decode_hex_escape())];
1717 match unicode_str::utf16_items(&buf).next() {
1718 Some(Utf16Item::ScalarValue(c)) => res.push(c),
1719 _ => return self.error(LoneLeadingSurrogateInHexEscape),
1723 n => match char::from_u32(n as u32) {
1724 Some(c) => res.push(c),
1725 None => return self.error(InvalidUnicodeCodePoint),
1728 _ => return self.error(InvalidEscape),
1731 } else if self.ch_is('\\') {
1739 Some(c
) => res
.push(c
),
1740 None
=> unreachable
!()
1746 // Invoked at each iteration, consumes the stream until it has enough
1747 // information to return a JsonEvent.
1748 // Manages an internal state so that parsing can be interrupted and resumed.
1749 // Also keeps track of the position in the logical structure of the json
1750 // stream isize the form of a stack that can be queried by the user using the
1752 fn parse(&mut self) -> JsonEvent
{
1754 // The only paths where the loop can spin a new iteration
1755 // are in the cases ParseArrayComma and ParseObjectComma if ','
1756 // is parsed. In these cases the state is set to (respectively)
1757 // ParseArray(false) and ParseObject(false), which always return,
1758 // so there is no risk of getting stuck in an infinite loop.
1759 // All other paths return before the end of the loop's iteration.
1760 self.parse_whitespace();
1764 return self.parse_start();
1766 ParseArray(first
) => {
1767 return self.parse_array(first
);
1769 ParseArrayComma
=> {
1770 match self.parse_array_comma_or_end() {
1771 Some(evt
) => { return evt; }
1775 ParseObject(first
) => {
1776 return self.parse_object(first
);
1778 ParseObjectComma
=> {
1780 if self.ch_is('
,'
) {
1781 self.state
= ParseObject(false);
1784 return self.parse_object_end();
1788 return self.error_event(InvalidSyntax
);
1794 fn parse_start(&mut self) -> JsonEvent
{
1795 let val
= self.parse_value();
1796 self.state
= match val
{
1797 Error(_
) => ParseFinished
,
1798 ArrayStart
=> ParseArray(true),
1799 ObjectStart
=> ParseObject(true),
1800 _
=> ParseBeforeFinish
,
1805 fn parse_array(&mut self, first
: bool
) -> JsonEvent
{
1806 if self.ch_is('
]'
) {
1808 self.error_event(InvalidSyntax
)
1810 self.state
= if self.stack
.is_empty() {
1812 } else if self.stack
.last_is_index() {
1822 self.stack
.push_index(0);
1824 let val
= self.parse_value();
1825 self.state
= match val
{
1826 Error(_
) => ParseFinished
,
1827 ArrayStart
=> ParseArray(true),
1828 ObjectStart
=> ParseObject(true),
1829 _
=> ParseArrayComma
,
1835 fn parse_array_comma_or_end(&mut self) -> Option
<JsonEvent
> {
1836 if self.ch_is('
,'
) {
1837 self.stack
.bump_index();
1838 self.state
= ParseArray(false);
1841 } else if self.ch_is('
]'
) {
1843 self.state
= if self.stack
.is_empty() {
1845 } else if self.stack
.last_is_index() {
1852 } else if self.eof() {
1853 Some(self.error_event(EOFWhileParsingArray
))
1855 Some(self.error_event(InvalidSyntax
))
1859 fn parse_object(&mut self, first
: bool
) -> JsonEvent
{
1860 if self.ch_is('
}'
) {
1862 if self.stack
.is_empty() {
1863 return self.error_event(TrailingComma
);
1868 self.state
= if self.stack
.is_empty() {
1870 } else if self.stack
.last_is_index() {
1879 return self.error_event(EOFWhileParsingObject
);
1881 if !self.ch_is('
"') {
1882 return self.error_event(KeyMustBeAString);
1884 let s = match self.parse_str() {
1887 self.state = ParseFinished;
1891 self.parse_whitespace();
1893 return self.error_event(EOFWhileParsingObject);
1894 } else if self.ch_or_null() != ':' {
1895 return self.error_event(ExpectedColon);
1897 self.stack.push_key(s);
1899 self.parse_whitespace();
1901 let val = self.parse_value();
1903 self.state = match val {
1904 Error(_) => ParseFinished,
1905 ArrayStart => ParseArray(true),
1906 ObjectStart => ParseObject(true),
1907 _ => ParseObjectComma,
1912 fn parse_object_end(&mut self) -> JsonEvent {
1913 if self.ch_is('}') {
1914 self.state = if self.stack.is_empty() {
1916 } else if self.stack.last_is_index() {
1923 } else if self.eof() {
1924 self.error_event(EOFWhileParsingObject)
1926 self.error_event(InvalidSyntax)
1930 fn parse_value(&mut self) -> JsonEvent {
1931 if self.eof() { return self.error_event(EOFWhileParsingValue); }
1932 match self.ch_or_null() {
1933 'n' => { self.parse_ident("ull", NullValue) }
1934 't' => { self.parse_ident("rue", BooleanValue(true)) }
1935 'f' => { self.parse_ident("alse", BooleanValue(false)) }
1936 '0' ... '9' | '-' => self.parse_number(),
1937 '"'
=> match self.parse_str() {
1938 Ok(s
) => StringValue(s
),
1949 _
=> { self.error_event(InvalidSyntax) }
1953 fn parse_ident(&mut self, ident
: &str, value
: JsonEvent
) -> JsonEvent
{
1954 if ident
.chars().all(|c
| Some(c
) == self.next_char()) {
1958 Error(SyntaxError(InvalidSyntax
, self.line
, self.col
))
1962 fn error_event(&mut self, reason
: ErrorCode
) -> JsonEvent
{
1963 self.state
= ParseFinished
;
1964 Error(SyntaxError(reason
, self.line
, self.col
))
1968 /// A Builder consumes a json::Parser to create a generic Json structure.
1969 pub struct Builder
<T
> {
1971 token
: Option
<JsonEvent
>,
1974 impl<T
: Iterator
<Item
=char>> Builder
<T
> {
1975 /// Create a JSON Builder.
1976 pub fn new(src
: T
) -> Builder
<T
> {
1977 Builder { parser: Parser::new(src), token: None, }
1980 // Decode a Json value from a Parser.
1981 pub fn build(&mut self) -> Result
<Json
, BuilderError
> {
1983 let result
= self.build_value();
1987 Some(Error(ref e
)) => { return Err(e.clone()); }
1988 ref tok
=> { panic!("unexpected token {:?}
", tok.clone()); }
1993 fn bump(&mut self) {
1994 self.token = self.parser.next();
1997 fn build_value(&mut self) -> Result<Json, BuilderError> {
1998 return match self.token {
1999 Some(NullValue) => Ok(Json::Null),
2000 Some(I64Value(n)) => Ok(Json::I64(n)),
2001 Some(U64Value(n)) => Ok(Json::U64(n)),
2002 Some(F64Value(n)) => Ok(Json::F64(n)),
2003 Some(BooleanValue(b)) => Ok(Json::Boolean(b)),
2004 Some(StringValue(ref mut s)) => {
2005 let mut temp = string::String::new();
2007 Ok(Json::String(temp))
2009 Some(Error(ref e)) => Err(e.clone()),
2010 Some(ArrayStart) => self.build_array(),
2011 Some(ObjectStart) => self.build_object(),
2012 Some(ObjectEnd) => self.parser.error(InvalidSyntax),
2013 Some(ArrayEnd) => self.parser.error(InvalidSyntax),
2014 None => self.parser.error(EOFWhileParsingValue),
2018 fn build_array(&mut self) -> Result<Json, BuilderError> {
2020 let mut values = Vec::new();
2023 if self.token == Some(ArrayEnd) {
2024 return Ok(Json::Array(values.into_iter().collect()));
2026 match self.build_value() {
2027 Ok(v) => values.push(v),
2028 Err(e) => { return Err(e) }
2034 fn build_object(&mut self) -> Result<Json, BuilderError> {
2037 let mut values = BTreeMap::new();
2041 Some(ObjectEnd) => { return Ok(Json::Object(values)); }
2042 Some(Error(ref e)) => { return Err(e.clone()); }
2046 let key = match self.parser.stack().top() {
2047 Some(StackElement::Key(k)) => { k.to_string() }
2048 _ => { panic!("invalid state"); }
2050 match self.build_value() {
2051 Ok(value) => { values.insert(key, value); }
2052 Err(e) => { return Err(e); }
2056 return self.parser.error(EOFWhileParsingObject);
2060 /// Decodes a json value from an `&mut io::Read`
2061 pub fn from_reader(rdr: &mut Read) -> Result<Json, BuilderError> {
2062 let mut contents = Vec::new();
2063 match rdr.read_to_end(&mut contents) {
2065 Err(e) => return Err(io_error_to_error(e))
2067 let s = match str::from_utf8(&contents).ok() {
2069 _ => return Err(SyntaxError(NotUtf8, 0, 0))
2071 let mut builder = Builder::new(s.chars());
2075 /// Decodes a json value from a string
2076 pub fn from_str(s: &str) -> Result<Json, BuilderError> {
2077 let mut builder = Builder::new(s.chars());
2081 /// A structure to decode JSON to values in rust.
2082 pub struct Decoder {
2087 /// Creates a new decoder instance for decoding the specified JSON value.
2088 pub fn new(json: Json) -> Decoder {
2089 Decoder { stack: vec![json] }
2094 fn pop(&mut self) -> Json {
2095 self.stack.pop().unwrap()
2099 macro_rules! expect {
2100 ($e:expr, Null) => ({
2102 Json::Null => Ok(()),
2103 other => Err(ExpectedError("Null
".to_string(),
2104 format!("{}
", other)))
2107 ($e:expr, $t:ident) => ({
2109 Json::$t(v) => Ok(v),
2111 Err(ExpectedError(stringify!($t).to_string(),
2112 format!("{}
", other)))
2118 macro_rules! read_primitive {
2119 ($name:ident, $ty:ty) => {
2120 fn $name(&mut self) -> DecodeResult<$ty> {
2122 Json::I64(f) => Ok(f as $ty),
2123 Json::U64(f) => Ok(f as $ty),
2124 Json::F64(f) => Err(ExpectedError("Integer
".to_string(), format!("{}
", f))),
2125 // re: #12967.. a type w/ numeric keys (ie HashMap<usize, V> etc)
2126 // is going to have a string here, as per JSON spec.
2127 Json::String(s) => match s.parse().ok() {
2129 None => Err(ExpectedError("Number
".to_string(), s)),
2131 value => Err(ExpectedError("Number
".to_string(), format!("{}
", value))),
2137 impl ::Decoder for Decoder {
2138 type Error = DecoderError;
2140 fn read_nil(&mut self) -> DecodeResult<()> {
2141 expect!(self.pop(), Null)
2144 read_primitive! { read_uint, usize }
2145 read_primitive! { read_u8, u8 }
2146 read_primitive! { read_u16, u16 }
2147 read_primitive! { read_u32, u32 }
2148 read_primitive! { read_u64, u64 }
2149 read_primitive! { read_int, isize }
2150 read_primitive! { read_i8, i8 }
2151 read_primitive! { read_i16, i16 }
2152 read_primitive! { read_i32, i32 }
2153 read_primitive! { read_i64, i64 }
2155 fn read_f32(&mut self) -> DecodeResult<f32> { self.read_f64().map(|x| x as f32) }
2157 fn read_f64(&mut self) -> DecodeResult<f64> {
2159 Json::I64(f) => Ok(f as f64),
2160 Json::U64(f) => Ok(f as f64),
2161 Json::F64(f) => Ok(f),
2162 Json::String(s) => {
2163 // re: #12967.. a type w/ numeric keys (ie HashMap<usize, V> etc)
2164 // is going to have a string here, as per JSON spec.
2165 match s.parse().ok() {
2167 None => Err(ExpectedError("Number
".to_string(), s)),
2170 Json::Null => Ok(f64::NAN),
2171 value => Err(ExpectedError("Number
".to_string(), format!("{}
", value)))
2175 fn read_bool(&mut self) -> DecodeResult<bool> {
2176 expect!(self.pop(), Boolean)
2179 fn read_char(&mut self) -> DecodeResult<char> {
2180 let s = try!(self.read_str());
2182 let mut it = s.chars();
2183 match (it.next(), it.next()) {
2184 // exactly one character
2185 (Some(c), None) => return Ok(c),
2189 Err(ExpectedError("single character string
".to_string(), format!("{}
", s)))
2192 fn read_str(&mut self) -> DecodeResult<string::String> {
2193 expect!(self.pop(), String)
2196 fn read_enum<T, F>(&mut self, _name: &str, f: F) -> DecodeResult<T> where
2197 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2202 fn read_enum_variant<T, F>(&mut self, names: &[&str],
2203 mut f: F) -> DecodeResult<T>
2204 where F: FnMut(&mut Decoder, usize) -> DecodeResult<T>,
2206 let name = match self.pop() {
2207 Json::String(s) => s,
2208 Json::Object(mut o) => {
2209 let n = match o.remove(&"variant
".to_string()) {
2210 Some(Json::String(s)) => s,
2212 return Err(ExpectedError("String
".to_string(), format!("{}
", val)))
2215 return Err(MissingFieldError("variant
".to_string()))
2218 match o.remove(&"fields
".to_string()) {
2219 Some(Json::Array(l)) => {
2220 for field in l.into_iter().rev() {
2221 self.stack.push(field);
2225 return Err(ExpectedError("Array
".to_string(), format!("{}
", val)))
2228 return Err(MissingFieldError("fields
".to_string()))
2234 return Err(ExpectedError("String or Object
".to_string(), format!("{}
", json)))
2237 let idx = match names.iter().position(|n| *n == &name[..]) {
2239 None => return Err(UnknownVariantError(name))
2244 fn read_enum_variant_arg<T, F>(&mut self, _idx: usize, f: F) -> DecodeResult<T> where
2245 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2250 fn read_enum_struct_variant<T, F>(&mut self, names: &[&str], f: F) -> DecodeResult<T> where
2251 F: FnMut(&mut Decoder, usize) -> DecodeResult<T>,
2253 self.read_enum_variant(names, f)
2257 fn read_enum_struct_variant_field<T, F>(&mut self,
2261 -> DecodeResult<T> where
2262 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2264 self.read_enum_variant_arg(idx, f)
2267 fn read_struct<T, F>(&mut self, _name: &str, _len: usize, f: F) -> DecodeResult<T> where
2268 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2270 let value = try!(f(self));
2275 fn read_struct_field<T, F>(&mut self,
2279 -> DecodeResult<T> where
2280 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2282 let mut obj = try!(expect!(self.pop(), Object));
2284 let value = match obj.remove(&name.to_string()) {
2286 // Add a Null and try to parse it as an Option<_>
2287 // to get None as a default value.
2288 self.stack.push(Json::Null);
2291 Err(_) => return Err(MissingFieldError(name.to_string())),
2295 self.stack.push(json);
2299 self.stack.push(Json::Object(obj));
2303 fn read_tuple<T, F>(&mut self, tuple_len: usize, f: F) -> DecodeResult<T> where
2304 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2306 self.read_seq(move |d, len| {
2307 if len == tuple_len {
2310 Err(ExpectedError(format!("Tuple{}
", tuple_len), format!("Tuple{}
", len)))
2315 fn read_tuple_arg<T, F>(&mut self, idx: usize, f: F) -> DecodeResult<T> where
2316 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2318 self.read_seq_elt(idx, f)
2321 fn read_tuple_struct<T, F>(&mut self,
2325 -> DecodeResult<T> where
2326 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2328 self.read_tuple(len, f)
2331 fn read_tuple_struct_arg<T, F>(&mut self,
2334 -> DecodeResult<T> where
2335 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2337 self.read_tuple_arg(idx, f)
2340 fn read_option<T, F>(&mut self, mut f: F) -> DecodeResult<T> where
2341 F: FnMut(&mut Decoder, bool) -> DecodeResult<T>,
2344 Json::Null => f(self, false),
2345 value => { self.stack.push(value); f(self, true) }
2349 fn read_seq<T, F>(&mut self, f: F) -> DecodeResult<T> where
2350 F: FnOnce(&mut Decoder, usize) -> DecodeResult<T>,
2352 let array = try!(expect!(self.pop(), Array));
2353 let len = array.len();
2354 for v in array.into_iter().rev() {
2360 fn read_seq_elt<T, F>(&mut self, _idx: usize, f: F) -> DecodeResult<T> where
2361 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2366 fn read_map<T, F>(&mut self, f: F) -> DecodeResult<T> where
2367 F: FnOnce(&mut Decoder, usize) -> DecodeResult<T>,
2369 let obj = try!(expect!(self.pop(), Object));
2370 let len = obj.len();
2371 for (key, value) in obj {
2372 self.stack.push(value);
2373 self.stack.push(Json::String(key));
2378 fn read_map_elt_key<T, F>(&mut self, _idx: usize, f: F) -> DecodeResult<T> where
2379 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2384 fn read_map_elt_val<T, F>(&mut self, _idx: usize, f: F) -> DecodeResult<T> where
2385 F: FnOnce(&mut Decoder) -> DecodeResult<T>,
2390 fn error(&mut self, err: &str) -> DecoderError {
2391 ApplicationError(err.to_string())
2395 /// A trait for converting values to JSON
2397 /// Converts the value of `self` to an instance of JSON
2398 fn to_json(&self) -> Json;
2401 macro_rules! to_json_impl_i64 {
2403 $(impl ToJson for $t {
2404 fn to_json(&self) -> Json {
2405 Json::I64(*self as i64)
2411 to_json_impl_i64! { isize, i8, i16, i32, i64 }
2413 macro_rules! to_json_impl_u64 {
2415 $(impl ToJson for $t {
2416 fn to_json(&self) -> Json {
2417 Json::U64(*self as u64)
2423 to_json_impl_u64! { usize, u8, u16, u32, u64 }
2425 impl ToJson for Json {
2426 fn to_json(&self) -> Json { self.clone() }
2429 impl ToJson for f32 {
2430 fn to_json(&self) -> Json { (*self as f64).to_json() }
2433 impl ToJson for f64 {
2434 fn to_json(&self) -> Json {
2435 match self.classify() {
2436 Fp::Nan | Fp::Infinite => Json::Null,
2437 _ => Json::F64(*self)
2442 impl ToJson for () {
2443 fn to_json(&self) -> Json { Json::Null }
2446 impl ToJson for bool {
2447 fn to_json(&self) -> Json { Json::Boolean(*self) }
2450 impl ToJson for str {
2451 fn to_json(&self) -> Json { Json::String(self.to_string()) }
2454 impl ToJson for string::String {
2455 fn to_json(&self) -> Json { Json::String((*self).clone()) }
2458 macro_rules! tuple_impl {
2459 // use variables to indicate the arity of the tuple
2460 ($($tyvar:ident),* ) => {
2461 // the trailing commas are for the 1 tuple
2463 $( $tyvar : ToJson ),*
2464 > ToJson for ( $( $tyvar ),* , ) {
2467 #[allow(non_snake_case)]
2468 fn to_json(&self) -> Json {
2470 ($(ref $tyvar),*,) => Json::Array(vec![$($tyvar.to_json()),*])
2479 tuple_impl!{A, B, C}
2480 tuple_impl!{A, B, C, D}
2481 tuple_impl!{A, B, C, D, E}
2482 tuple_impl!{A, B, C, D, E, F}
2483 tuple_impl!{A, B, C, D, E, F, G}
2484 tuple_impl!{A, B, C, D, E, F, G, H}
2485 tuple_impl!{A, B, C, D, E, F, G, H, I}
2486 tuple_impl!{A, B, C, D, E, F, G, H, I, J}
2487 tuple_impl!{A, B, C, D, E, F, G, H, I, J, K}
2488 tuple_impl!{A, B, C, D, E, F, G, H, I, J, K, L}
2490 impl<A: ToJson> ToJson for [A] {
2491 fn to_json(&self) -> Json { Json::Array(self.iter().map(|elt| elt.to_json()).collect()) }
2494 impl<A: ToJson> ToJson for Vec<A> {
2495 fn to_json(&self) -> Json { Json::Array(self.iter().map(|elt| elt.to_json()).collect()) }
2498 impl<A: ToJson> ToJson for BTreeMap<string::String, A> {
2499 fn to_json(&self) -> Json {
2500 let mut d = BTreeMap::new();
2501 for (key, value) in self {
2502 d.insert((*key).clone(), value.to_json());
2508 impl<A: ToJson> ToJson for HashMap<string::String, A> {
2509 fn to_json(&self) -> Json {
2510 let mut d = BTreeMap::new();
2511 for (key, value) in self {
2512 d.insert((*key).clone(), value.to_json());
2518 impl<A:ToJson> ToJson for Option<A> {
2519 fn to_json(&self) -> Json {
2522 Some(ref value) => value.to_json()
2527 struct FormatShim<'a, 'b: 'a> {
2528 inner: &'a mut fmt::Formatter<'b>,
2531 impl<'a, 'b> fmt::Write for FormatShim<'a, 'b> {
2532 fn write_str(&mut self, s: &str) -> fmt::Result {
2533 match self.inner.write_str(s) {
2535 Err(_) => Err(fmt::Error)
2540 impl fmt::Display for Json {
2541 /// Encodes a json value into a string
2542 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
2543 let mut shim = FormatShim { inner: f };
2544 let mut encoder = Encoder::new(&mut shim);
2545 match self.encode(&mut encoder) {
2547 Err(_) => Err(fmt::Error)
2552 impl<'a> fmt::Display for PrettyJson<'a> {
2553 /// Encodes a json value into a string
2554 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
2555 let mut shim = FormatShim { inner: f };
2556 let mut encoder = PrettyEncoder::new(&mut shim);
2557 match self.inner.encode(&mut encoder) {
2559 Err(_) => Err(fmt::Error)
2564 impl<'a, T: Encodable> fmt::Display for AsJson<'a, T> {
2565 /// Encodes a json value into a string
2566 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
2567 let mut shim = FormatShim { inner: f };
2568 let mut encoder = Encoder::new(&mut shim);
2569 match self.inner.encode(&mut encoder) {
2571 Err(_) => Err(fmt::Error)
2576 impl<'a, T> AsPrettyJson<'a, T> {
2577 /// Set the indentation level for the emitted JSON
2578 pub fn indent(mut self, indent: usize) -> AsPrettyJson<'a, T> {
2579 self.indent = Some(indent);
2584 impl<'a, T: Encodable> fmt::Display for AsPrettyJson<'a, T> {
2585 /// Encodes a json value into a string
2586 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
2587 let mut shim = FormatShim { inner: f };
2588 let mut encoder = PrettyEncoder::new(&mut shim);
2590 Some(n) => encoder.set_indent(n),
2593 match self.inner.encode(&mut encoder) {
2595 Err(_) => Err(fmt::Error)
2600 impl FromStr for Json {
2601 type Err = BuilderError;
2602 fn from_str(s: &str) -> Result<Json, BuilderError> {
2610 use self::Animal::*;
2611 use self::DecodeEnum::*;
2612 use self::test::Bencher;
2613 use {Encodable, Decodable};
2615 use super::ErrorCode::*;
2616 use super::ParserError::*;
2617 use super::DecoderError::*;
2618 use super::JsonEvent::*;
2619 use super::{Json, from_str, DecodeResult, DecoderError, JsonEvent, Parser,
2620 StackElement, Stack, Decoder, Encoder, EncoderError};
2621 use std::{i64, u64, f32, f64};
2622 use std::io::prelude::*;
2623 use std::collections::BTreeMap;
2626 #[derive(RustcDecodable, Eq, PartialEq, Debug)]
2632 fn test_decode_option_none() {
2634 let obj: OptionData = super::decode(s).unwrap();
2635 assert_eq!(obj, OptionData { opt: None });
2639 fn test_decode_option_some() {
2640 let s = "{ \"opt\": 10 }
";
2641 let obj: OptionData = super::decode(s).unwrap();
2642 assert_eq!(obj, OptionData { opt: Some(10) });
2646 fn test_decode_option_malformed() {
2647 check_err::<OptionData>("{ \"opt\": [] }
",
2648 ExpectedError("Number
".to_string(), "[]".to_string()));
2649 check_err::<OptionData>("{ \"opt\": false }
",
2650 ExpectedError("Number
".to_string(), "false".to_string()));
2653 #[derive(PartialEq, RustcEncodable, RustcDecodable, Debug)]
2656 Frog(string::String, isize)
2659 #[derive(PartialEq, RustcEncodable, RustcDecodable, Debug)]
2663 c: Vec<string::String>,
2666 #[derive(PartialEq, RustcEncodable, RustcDecodable, Debug)]
2671 fn mk_object(items: &[(string::String, Json)]) -> Json {
2672 let mut d = BTreeMap::new();
2676 (ref key, ref value) => { d.insert((*key).clone(), (*value).clone()); },
2684 fn test_from_str_trait() {
2686 assert!(s.parse::<Json>().unwrap() == s.parse().unwrap());
2690 fn test_write_null() {
2691 assert_eq!(Null.to_string(), "null
");
2692 assert_eq!(Null.pretty().to_string(), "null
");
2696 fn test_write_i64() {
2697 assert_eq!(U64(0).to_string(), "0");
2698 assert_eq!(U64(0).pretty().to_string(), "0");
2700 assert_eq!(U64(1234).to_string(), "1234");
2701 assert_eq!(U64(1234).pretty().to_string(), "1234");
2703 assert_eq!(I64(-5678).to_string(), "-5678");
2704 assert_eq!(I64(-5678).pretty().to_string(), "-5678");
2706 assert_eq!(U64(7650007200025252000).to_string(), "7650007200025252000");
2707 assert_eq!(U64(7650007200025252000).pretty().to_string(), "7650007200025252000");
2711 fn test_write_f64() {
2712 assert_eq!(F64(3.0).to_string(), "3.0");
2713 assert_eq!(F64(3.0).pretty().to_string(), "3.0");
2715 assert_eq!(F64(3.1).to_string(), "3.1");
2716 assert_eq!(F64(3.1).pretty().to_string(), "3.1");
2718 assert_eq!(F64(-1.5).to_string(), "-1.5");
2719 assert_eq!(F64(-1.5).pretty().to_string(), "-1.5");
2721 assert_eq!(F64(0.5).to_string(), "0.5");
2722 assert_eq!(F64(0.5).pretty().to_string(), "0.5");
2724 assert_eq!(F64(f64::NAN).to_string(), "null
");
2725 assert_eq!(F64(f64::NAN).pretty().to_string(), "null
");
2727 assert_eq!(F64(f64::INFINITY).to_string(), "null
");
2728 assert_eq!(F64(f64::INFINITY).pretty().to_string(), "null
");
2730 assert_eq!(F64(f64::NEG_INFINITY).to_string(), "null
");
2731 assert_eq!(F64(f64::NEG_INFINITY).pretty().to_string(), "null
");
2735 fn test_write_str() {
2736 assert_eq!(String("".to_string()).to_string(), "\"\"");
2737 assert_eq!(String("".to_string()).pretty().to_string(), "\"\"");
2739 assert_eq!(String("homura
".to_string()).to_string(), "\"homura
\"");
2740 assert_eq!(String("madoka
".to_string()).pretty().to_string(), "\"madoka
\"");
2744 fn test_write_bool() {
2745 assert_eq!(Boolean(true).to_string(), "true");
2746 assert_eq!(Boolean(true).pretty().to_string(), "true");
2748 assert_eq!(Boolean(false).to_string(), "false");
2749 assert_eq!(Boolean(false).pretty().to_string(), "false");
2753 fn test_write_array() {
2754 assert_eq!(Array(vec![]).to_string(), "[]");
2755 assert_eq!(Array(vec![]).pretty().to_string(), "[]");
2757 assert_eq!(Array(vec![Boolean(true)]).to_string(), "[true]");
2759 Array(vec![Boolean(true)]).pretty().to_string(),
2766 let long_test_array = Array(vec![
2769 Array(vec![String("foo
\nbar
".to_string()), F64(3.5)])]);
2771 assert_eq!(long_test_array.to_string(),
2772 "[false,null
,[\"foo
\\nbar
\",3.5]]");
2774 long_test_array.pretty().to_string(),
2788 fn test_write_object() {
2789 assert_eq!(mk_object(&[]).to_string(), "{}
");
2790 assert_eq!(mk_object(&[]).pretty().to_string(), "{}
");
2794 ("a
".to_string(), Boolean(true))
2799 mk_object(&[("a
".to_string(), Boolean(true))]).pretty().to_string(),
2806 let complex_obj = mk_object(&[
2807 ("b
".to_string(), Array(vec![
2808 mk_object(&[("c
".to_string(), String("\x0c
\r".to_string()))]),
2809 mk_object(&[("d
".to_string(), String("".to_string()))])
2814 complex_obj.to_string(),
2817 {\"c\":\"\\f\\r\"}
,\
2823 complex_obj.pretty().to_string(),
2828 \"c
\": \"\\f
\\r
\"\n \
2837 let a = mk_object(&[
2838 ("a
".to_string(), Boolean(true)),
2839 ("b
".to_string(), Array(vec![
2840 mk_object(&[("c
".to_string(), String("\x0c
\r".to_string()))]),
2841 mk_object(&[("d
".to_string(), String("".to_string()))])
2845 // We can't compare the strings directly because the object fields be
2846 // printed in a different order.
2847 assert_eq!(a.clone(), a.to_string().parse().unwrap());
2848 assert_eq!(a.clone(), a.pretty().to_string().parse().unwrap());
2852 fn test_write_enum() {
2855 format!("{}
", super::as_json(&animal)),
2859 format!("{}
", super::as_pretty_json(&animal)),
2863 let animal = Frog("Henry
".to_string(), 349);
2865 format!("{}
", super::as_json(&animal)),
2866 "{\"variant\":\"Frog\",\"fields\":[\"Henry\",349]}
"
2869 format!("{}
", super::as_pretty_json(&animal)),
2871 \"variant
\": \"Frog
\",\n \
2880 macro_rules! check_encoder_for_simple {
2881 ($value:expr, $expected:expr) => ({
2882 let s = format!("{}
", super::as_json(&$value));
2883 assert_eq!(s, $expected);
2885 let s = format!("{}
", super::as_pretty_json(&$value));
2886 assert_eq!(s, $expected);
2891 fn test_write_some() {
2892 check_encoder_for_simple!(Some("jodhpurs
".to_string()), "\"jodhpurs
\"");
2896 fn test_write_none() {
2897 check_encoder_for_simple!(None::<string::String>, "null
");
2901 fn test_write_char() {
2902 check_encoder_for_simple!('a', "\"a
\"");
2903 check_encoder_for_simple!('\t', "\"\\t
\"");
2904 check_encoder_for_simple!('\u{0000}', "\"\\u0000
\"");
2905 check_encoder_for_simple!('\u{001b}', "\"\\u001b
\"");
2906 check_encoder_for_simple!('\u{007f}', "\"\\u007f
\"");
2907 check_encoder_for_simple!('\u{00a0}', "\"\u{00a0}\"");
2908 check_encoder_for_simple!('\u{abcd}', "\"\u{abcd}\"");
2909 check_encoder_for_simple!('\u{10ffff}', "\"\u{10ffff}
\"");
2913 fn test_trailing_characters() {
2914 assert_eq!(from_str("nulla
"), Err(SyntaxError(TrailingCharacters, 1, 5)));
2915 assert_eq!(from_str("truea
"), Err(SyntaxError(TrailingCharacters, 1, 5)));
2916 assert_eq!(from_str("falsea
"), Err(SyntaxError(TrailingCharacters, 1, 6)));
2917 assert_eq!(from_str("1a
"), Err(SyntaxError(TrailingCharacters, 1, 2)));
2918 assert_eq!(from_str("[]a
"), Err(SyntaxError(TrailingCharacters, 1, 3)));
2919 assert_eq!(from_str("{}a
"), Err(SyntaxError(TrailingCharacters, 1, 3)));
2923 fn test_read_identifiers() {
2924 assert_eq!(from_str("n
"), Err(SyntaxError(InvalidSyntax, 1, 2)));
2925 assert_eq!(from_str("nul
"), Err(SyntaxError(InvalidSyntax, 1, 4)));
2926 assert_eq!(from_str("t
"), Err(SyntaxError(InvalidSyntax, 1, 2)));
2927 assert_eq!(from_str("truz
"), Err(SyntaxError(InvalidSyntax, 1, 4)));
2928 assert_eq!(from_str("f
"), Err(SyntaxError(InvalidSyntax, 1, 2)));
2929 assert_eq!(from_str("faz
"), Err(SyntaxError(InvalidSyntax, 1, 3)));
2931 assert_eq!(from_str("null
"), Ok(Null));
2932 assert_eq!(from_str("true"), Ok(Boolean(true)));
2933 assert_eq!(from_str("false"), Ok(Boolean(false)));
2934 assert_eq!(from_str(" null
"), Ok(Null));
2935 assert_eq!(from_str(" true "), Ok(Boolean(true)));
2936 assert_eq!(from_str(" false "), Ok(Boolean(false)));
2940 fn test_decode_identifiers() {
2941 let v: () = super::decode("null
").unwrap();
2944 let v: bool = super::decode("true").unwrap();
2945 assert_eq!(v, true);
2947 let v: bool = super::decode("false").unwrap();
2948 assert_eq!(v, false);
2952 fn test_read_number() {
2953 assert_eq!(from_str("+"), Err(SyntaxError(InvalidSyntax, 1, 1)));
2954 assert_eq!(from_str("."), Err(SyntaxError(InvalidSyntax, 1, 1)));
2955 assert_eq!(from_str("NaN
"), Err(SyntaxError(InvalidSyntax, 1, 1)));
2956 assert_eq!(from_str("-"), Err(SyntaxError(InvalidNumber, 1, 2)));
2957 assert_eq!(from_str("00"), Err(SyntaxError(InvalidNumber, 1, 2)));
2958 assert_eq!(from_str("1."), Err(SyntaxError(InvalidNumber, 1, 3)));
2959 assert_eq!(from_str("1e
"), Err(SyntaxError(InvalidNumber, 1, 3)));
2960 assert_eq!(from_str("1e
+"), Err(SyntaxError(InvalidNumber, 1, 4)));
2962 assert_eq!(from_str("18446744073709551616"), Err(SyntaxError(InvalidNumber, 1, 20)));
2963 assert_eq!(from_str("-9223372036854775809"), Err(SyntaxError(InvalidNumber, 1, 21)));
2965 assert_eq!(from_str("3"), Ok(U64(3)));
2966 assert_eq!(from_str("3.1"), Ok(F64(3.1)));
2967 assert_eq!(from_str("-1.2"), Ok(F64(-1.2)));
2968 assert_eq!(from_str("0.4"), Ok(F64(0.4)));
2969 assert_eq!(from_str("0.4e5
"), Ok(F64(0.4e5)));
2970 assert_eq!(from_str("0.4e+15"), Ok(F64(0.4e15)));
2971 assert_eq!(from_str("0.4e-01"), Ok(F64(0.4e-01)));
2972 assert_eq!(from_str(" 3 "), Ok(U64(3)));
2974 assert_eq!(from_str("-9223372036854775808"), Ok(I64(i64::MIN)));
2975 assert_eq!(from_str("9223372036854775807"), Ok(U64(i64::MAX as u64)));
2976 assert_eq!(from_str("18446744073709551615"), Ok(U64(u64::MAX)));
2980 fn test_decode_numbers() {
2981 let v: f64 = super::decode("3").unwrap();
2984 let v: f64 = super::decode("3.1").unwrap();
2987 let v: f64 = super::decode("-1.2").unwrap();
2988 assert_eq!(v, -1.2);
2990 let v: f64 = super::decode("0.4").unwrap();
2993 let v: f64 = super::decode("0.4e5
").unwrap();
2994 assert_eq!(v, 0.4e5);
2996 let v: f64 = super::decode("0.4e15
").unwrap();
2997 assert_eq!(v, 0.4e15);
2999 let v: f64 = super::decode("0.4e-01").unwrap();
3000 assert_eq!(v, 0.4e-01);
3002 let v: u64 = super::decode("0").unwrap();
3005 let v: u64 = super::decode("18446744073709551615").unwrap();
3006 assert_eq!(v, u64::MAX);
3008 let v: i64 = super::decode("-9223372036854775808").unwrap();
3009 assert_eq!(v, i64::MIN);
3011 let v: i64 = super::decode("9223372036854775807").unwrap();
3012 assert_eq!(v, i64::MAX);
3014 let res: DecodeResult<i64> = super::decode("765.25");
3015 assert_eq!(res, Err(ExpectedError("Integer
".to_string(),
3016 "765.25".to_string())));
3020 fn test_read_str() {
3021 assert_eq!(from_str("\""), Err(SyntaxError(EOFWhileParsingString, 1, 2)));
3022 assert_eq!(from_str("\"lol
"), Err(SyntaxError(EOFWhileParsingString, 1, 5)));
3024 assert_eq!(from_str("\"\""), Ok(String("".to_string())));
3025 assert_eq!(from_str("\"foo
\""), Ok(String("foo
".to_string())));
3026 assert_eq!(from_str("\"\\\"\""), Ok(String("\"".to_string())));
3027 assert_eq!(from_str("\"\\b
\""), Ok(String("\x08
".to_string())));
3028 assert_eq!(from_str("\"\\n
\""), Ok(String("\n".to_string())));
3029 assert_eq!(from_str("\"\\r
\""), Ok(String("\r".to_string())));
3030 assert_eq!(from_str("\"\\t
\""), Ok(String("\t".to_string())));
3031 assert_eq!(from_str(" \"foo
\" "), Ok(String("foo
".to_string())));
3032 assert_eq!(from_str("\"\\u12ab
\""), Ok(String("\u{12ab}".to_string())));
3033 assert_eq!(from_str("\"\\uAB12
\""), Ok(String("\u{AB12}".to_string())));
3037 fn test_decode_str() {
3038 let s = [("\"\"", ""),
3041 ("\"\\b
\"", "\x08
"),
3045 ("\"\\u12ab
\"", "\u{12ab}"),
3046 ("\"\\uAB12
\"", "\u{AB12}")];
3049 let v: string::String = super::decode(i).unwrap();
3055 fn test_read_array() {
3056 assert_eq!(from_str("["), Err(SyntaxError(EOFWhileParsingValue, 1, 2)));
3057 assert_eq!(from_str("[1"), Err(SyntaxError(EOFWhileParsingArray, 1, 3)));
3058 assert_eq!(from_str("[1,"), Err(SyntaxError(EOFWhileParsingValue, 1, 4)));
3059 assert_eq!(from_str("[1,]"), Err(SyntaxError(InvalidSyntax, 1, 4)));
3060 assert_eq!(from_str("[6 7]"), Err(SyntaxError(InvalidSyntax, 1, 4)));
3062 assert_eq!(from_str("[]"), Ok(Array(vec![])));
3063 assert_eq!(from_str("[ ]"), Ok(Array(vec![])));
3064 assert_eq!(from_str("[true]"), Ok(Array(vec![Boolean(true)])));
3065 assert_eq!(from_str("[ false ]"), Ok(Array(vec![Boolean(false)])));
3066 assert_eq!(from_str("[null
]"), Ok(Array(vec![Null])));
3067 assert_eq!(from_str("[3, 1]"),
3068 Ok(Array(vec![U64(3), U64(1)])));
3069 assert_eq!(from_str("\n[3, 2]\n"),
3070 Ok(Array(vec![U64(3), U64(2)])));
3071 assert_eq!(from_str("[2, [4, 1]]"),
3072 Ok(Array(vec![U64(2), Array(vec![U64(4), U64(1)])])));
3076 fn test_decode_array() {
3077 let v: Vec<()> = super::decode("[]").unwrap();
3080 let v: Vec<()> = super::decode("[null
]").unwrap();
3081 assert_eq!(v, [()]);
3083 let v: Vec<bool> = super::decode("[true]").unwrap();
3084 assert_eq!(v, [true]);
3086 let v: Vec<isize> = super::decode("[3, 1]").unwrap();
3087 assert_eq!(v, [3, 1]);
3089 let v: Vec<Vec<usize>> = super::decode("[[3], [1, 2]]").unwrap();
3090 assert_eq!(v, [vec![3], vec![1, 2]]);
3094 fn test_decode_tuple() {
3095 let t: (usize, usize, usize) = super::decode("[1, 2, 3]").unwrap();
3096 assert_eq!(t, (1, 2, 3));
3098 let t: (usize, string::String) = super::decode("[1, \"two
\"]").unwrap();
3099 assert_eq!(t, (1, "two
".to_string()));
3103 fn test_decode_tuple_malformed_types() {
3104 assert!(super::decode::<(usize, string::String)>("[1, 2]").is_err());
3108 fn test_decode_tuple_malformed_length() {
3109 assert!(super::decode::<(usize, usize)>("[1, 2, 3]").is_err());
3113 fn test_read_object() {
3114 assert_eq!(from_str("{"), Err(SyntaxError(EOFWhileParsingObject, 1, 2)));
3115 assert_eq!(from_str("{ "), Err(SyntaxError(EOFWhileParsingObject, 1, 3)));
3116 assert_eq!(from_str("{1"), Err(SyntaxError(KeyMustBeAString, 1, 2)));
3117 assert_eq!(from_str("{ \"a
\""), Err(SyntaxError(EOFWhileParsingObject, 1, 6)));
3118 assert_eq!(from_str("{\"a
\""), Err(SyntaxError(EOFWhileParsingObject, 1, 5)));
3119 assert_eq!(from_str("{\"a
\" "), Err(SyntaxError(EOFWhileParsingObject, 1, 6)));
3121 assert_eq!(from_str("{\"a
\" 1"), Err(SyntaxError(ExpectedColon, 1, 6)));
3122 assert_eq!(from_str("{\"a
\":"), Err(SyntaxError(EOFWhileParsingValue, 1, 6)));
3123 assert_eq!(from_str("{\"a
\":1"), Err(SyntaxError(EOFWhileParsingObject, 1, 7)));
3124 assert_eq!(from_str("{\"a
\":1 1"), Err(SyntaxError(InvalidSyntax, 1, 8)));
3125 assert_eq!(from_str("{\"a
\":1,"), Err(SyntaxError(EOFWhileParsingObject, 1, 8)));
3127 assert_eq!(from_str("{}
").unwrap(), mk_object(&[]));
3128 assert_eq!(from_str("{\"a\": 3}
").unwrap(),
3129 mk_object(&[("a
".to_string(), U64(3))]));
3131 assert_eq!(from_str(
3132 "{ \"a\": null, \"b\" : true }
").unwrap(),
3134 ("a
".to_string(), Null),
3135 ("b
".to_string(), Boolean(true))]));
3136 assert_eq!(from_str("\n{ \"a\": null, \"b\" : true }
\n").unwrap(),
3138 ("a
".to_string(), Null),
3139 ("b
".to_string(), Boolean(true))]));
3140 assert_eq!(from_str(
3141 "{\"a\" : 1.0 ,\"b\": [ true ]}
").unwrap(),
3143 ("a
".to_string(), F64(1.0)),
3144 ("b
".to_string(), Array(vec![Boolean(true)]))
3146 assert_eq!(from_str(
3152 { \"c\": {\"d\": null}
} \
3156 ("a
".to_string(), F64(1.0)),
3157 ("b
".to_string(), Array(vec![
3159 String("foo
\nbar
".to_string()),
3161 ("c
".to_string(), mk_object(&[("d
".to_string(), Null)]))
3168 fn test_decode_struct() {
3171 { \"a\": null, \"b\": 2, \"c\": [\"abc\", \"xyz\"] }
3175 let v: Outer = super::decode(s).unwrap();
3180 Inner { a: (), b: 2, c: vec!["abc".to_string(), "xyz".to_string()] }
3186 #[derive(RustcDecodable)]
3187 struct FloatStruct {
3192 fn test_decode_struct_with_nan() {
3193 let s = "{\"f\":null,\"a\":[null,123]}
";
3194 let obj: FloatStruct = super::decode(s).unwrap();
3195 assert!(obj.f.is_nan());
3196 assert!(obj.a[0].is_nan());
3197 assert_eq!(obj.a[1], 123f64);
3201 fn test_decode_option() {
3202 let value: Option<string::String> = super::decode("null
").unwrap();
3203 assert_eq!(value, None);
3205 let value: Option<string::String> = super::decode("\"jodhpurs
\"").unwrap();
3206 assert_eq!(value, Some("jodhpurs
".to_string()));
3210 fn test_decode_enum() {
3211 let value: Animal = super::decode("\"Dog
\"").unwrap();
3212 assert_eq!(value, Dog);
3214 let s = "{\"variant\":\"Frog\",\"fields\":[\"Henry\",349]}
";
3215 let value: Animal = super::decode(s).unwrap();
3216 assert_eq!(value, Frog("Henry
".to_string(), 349));
3220 fn test_decode_map() {
3221 let s = "{\"a
\": \"Dog
\", \"b
\": {\"variant
\":\"Frog
\",\
3222 \"fields
\":[\"Henry
\", 349]}}";
3223 let mut map: BTreeMap<string::String, Animal> = super::decode(s).unwrap();
3225 assert_eq!(map.remove(&"a
".to_string()), Some(Dog));
3226 assert_eq!(map.remove(&"b
".to_string()), Some(Frog("Henry
".to_string(), 349)));
3230 fn test_multiline_errors() {
3231 assert_eq!(from_str("{\n \"foo
\":\n \"bar
\""),
3232 Err(SyntaxError(EOFWhileParsingObject, 3, 8)));
3235 #[derive(RustcDecodable)]
3237 struct DecodeStruct {
3241 w: Vec<DecodeStruct>
3243 #[derive(RustcDecodable)]
3248 fn check_err<T: Decodable>(to_parse: &'static str, expected: DecoderError) {
3249 let res: DecodeResult<T> = match from_str(to_parse) {
3250 Err(e) => Err(ParseError(e)),
3251 Ok(json) => Decodable::decode(&mut Decoder::new(json))
3254 Ok(_) => panic!("`{:?}` parsed
& decoded ok
, expecting error `{:?}`
",
3255 to_parse, expected),
3256 Err(ParseError(e)) => panic!("`{:?}` is not valid json
: {:?}
",
3259 assert_eq!(e, expected);
3264 fn test_decode_errors_struct() {
3265 check_err::<DecodeStruct>("[]", ExpectedError("Object
".to_string(), "[]".to_string()));
3266 check_err::<DecodeStruct>("{\"x\": true, \"y\": true, \"z\": \"\", \"w\": []}
",
3267 ExpectedError("Number
".to_string(), "true".to_string()));
3268 check_err::<DecodeStruct>("{\"x\": 1, \"y\": [], \"z\": \"\", \"w\": []}
",
3269 ExpectedError("Boolean
".to_string(), "[]".to_string()));
3270 check_err::<DecodeStruct>("{\"x\": 1, \"y\": true, \"z\": {}
, \"w
\": []}",
3271 ExpectedError("String
".to_string(), "{}
".to_string()));
3272 check_err::<DecodeStruct>("{\"x\": 1, \"y\": true, \"z\": \"\", \"w\": null}
",
3273 ExpectedError("Array
".to_string(), "null
".to_string()));
3274 check_err::<DecodeStruct>("{\"x\": 1, \"y\": true, \"z\": \"\"}
",
3275 MissingFieldError("w
".to_string()));
3278 fn test_decode_errors_enum() {
3279 check_err::<DecodeEnum>("{}
",
3280 MissingFieldError("variant
".to_string()));
3281 check_err::<DecodeEnum>("{\"variant\": 1}
",
3282 ExpectedError("String
".to_string(), "1".to_string()));
3283 check_err::<DecodeEnum>("{\"variant\": \"A\"}
",
3284 MissingFieldError("fields
".to_string()));
3285 check_err::<DecodeEnum>("{\"variant\": \"A\", \"fields\": null}
",
3286 ExpectedError("Array
".to_string(), "null
".to_string()));
3287 check_err::<DecodeEnum>("{\"variant\": \"C\", \"fields\": []}
",
3288 UnknownVariantError("C
".to_string()));
3293 let json_value = from_str("{\"dog\" : \"cat\"}
").unwrap();
3294 let found_str = json_value.find("dog
");
3295 assert!(found_str.unwrap().as_string().unwrap() == "cat
");
3299 fn test_find_path(){
3300 let json_value = from_str("{\"dog\":{\"cat\": {\"mouse\" : \"cheese\"}
}}").unwrap();
3301 let found_str = json_value.find_path(&["dog
", "cat
", "mouse
"]);
3302 assert!(found_str.unwrap().as_string().unwrap() == "cheese
");
3307 let json_value = from_str("{\"dog\":{\"cat\": {\"mouse\" : \"cheese\"}
}}").unwrap();
3308 let found_str = json_value.search("mouse
").and_then(|j| j.as_string());
3309 assert!(found_str.unwrap() == "cheese
");
3314 let json_value = from_str("{\"animals\":[\"dog\",\"cat\",\"mouse\"]}
").unwrap();
3315 let ref array = json_value["animals
"];
3316 assert_eq!(array[0].as_string().unwrap(), "dog
");
3317 assert_eq!(array[1].as_string().unwrap(), "cat
");
3318 assert_eq!(array[2].as_string().unwrap(), "mouse
");
3322 fn test_is_object(){
3323 let json_value = from_str("{}
").unwrap();
3324 assert!(json_value.is_object());
3328 fn test_as_object(){
3329 let json_value = from_str("{}
").unwrap();
3330 let json_object = json_value.as_object();
3331 assert!(json_object.is_some());
3336 let json_value = from_str("[1, 2, 3]").unwrap();
3337 assert!(json_value.is_array());
3342 let json_value = from_str("[1, 2, 3]").unwrap();
3343 let json_array = json_value.as_array();
3344 let expected_length = 3;
3345 assert!(json_array.is_some() && json_array.unwrap().len() == expected_length);
3349 fn test_is_string(){
3350 let json_value = from_str("\"dog
\"").unwrap();
3351 assert!(json_value.is_string());
3355 fn test_as_string(){
3356 let json_value = from_str("\"dog
\"").unwrap();
3357 let json_str = json_value.as_string();
3358 let expected_str = "dog
";
3359 assert_eq!(json_str, Some(expected_str));
3363 fn test_is_number(){
3364 let json_value = from_str("12").unwrap();
3365 assert!(json_value.is_number());
3370 let json_value = from_str("-12").unwrap();
3371 assert!(json_value.is_i64());
3373 let json_value = from_str("12").unwrap();
3374 assert!(!json_value.is_i64());
3376 let json_value = from_str("12.0").unwrap();
3377 assert!(!json_value.is_i64());
3382 let json_value = from_str("12").unwrap();
3383 assert!(json_value.is_u64());
3385 let json_value = from_str("-12").unwrap();
3386 assert!(!json_value.is_u64());
3388 let json_value = from_str("12.0").unwrap();
3389 assert!(!json_value.is_u64());
3394 let json_value = from_str("12").unwrap();
3395 assert!(!json_value.is_f64());
3397 let json_value = from_str("-12").unwrap();
3398 assert!(!json_value.is_f64());
3400 let json_value = from_str("12.0").unwrap();
3401 assert!(json_value.is_f64());
3403 let json_value = from_str("-12.0").unwrap();
3404 assert!(json_value.is_f64());
3409 let json_value = from_str("-12").unwrap();
3410 let json_num = json_value.as_i64();
3411 assert_eq!(json_num, Some(-12));
3416 let json_value = from_str("12").unwrap();
3417 let json_num = json_value.as_u64();
3418 assert_eq!(json_num, Some(12));
3423 let json_value = from_str("12.0").unwrap();
3424 let json_num = json_value.as_f64();
3425 assert_eq!(json_num, Some(12f64));
3429 fn test_is_boolean(){
3430 let json_value = from_str("false").unwrap();
3431 assert!(json_value.is_boolean());
3435 fn test_as_boolean(){
3436 let json_value = from_str("false").unwrap();
3437 let json_bool = json_value.as_boolean();
3438 let expected_bool = false;
3439 assert!(json_bool.is_some() && json_bool.unwrap() == expected_bool);
3444 let json_value = from_str("null
").unwrap();
3445 assert!(json_value.is_null());
3450 let json_value = from_str("null
").unwrap();
3451 let json_null = json_value.as_null();
3452 let expected_null = ();
3453 assert!(json_null.is_some() && json_null.unwrap() == expected_null);
3457 fn test_encode_hashmap_with_numeric_key() {
3458 use std::str::from_utf8;
3459 use std::collections::HashMap;
3460 let mut hm: HashMap<usize, bool> = HashMap::new();
3462 let mut mem_buf = Vec::new();
3463 write!(&mut mem_buf, "{}
", super::as_pretty_json(&hm)).unwrap();
3464 let json_str = from_utf8(&mem_buf[..]).unwrap();
3465 match from_str(json_str) {
3466 Err(_) => panic!("Unable to parse json_str
: {:?}
", json_str),
3467 _ => {} // it parsed and we are good to go
3472 fn test_prettyencode_hashmap_with_numeric_key() {
3473 use std::str::from_utf8;
3474 use std::collections::HashMap;
3475 let mut hm: HashMap<usize, bool> = HashMap::new();
3477 let mut mem_buf = Vec::new();
3478 write!(&mut mem_buf, "{}
", super::as_pretty_json(&hm)).unwrap();
3479 let json_str = from_utf8(&mem_buf[..]).unwrap();
3480 match from_str(json_str) {
3481 Err(_) => panic!("Unable to parse json_str
: {:?}
", json_str),
3482 _ => {} // it parsed and we are good to go
3487 fn test_prettyencoder_indent_level_param() {
3488 use std::str::from_utf8;
3489 use std::collections::BTreeMap;
3491 let mut tree = BTreeMap::new();
3493 tree.insert("hello
".to_string(), String("guten tag
".to_string()));
3494 tree.insert("goodbye
".to_string(), String("sayonara
".to_string()));
3497 // The following layout below should look a lot like
3498 // the pretty-printed JSON (indent * x)
3501 String("greetings
".to_string()), // 1x
3502 Object(tree), // 1x + 2x + 2x + 1x
3504 // End JSON array (7 lines)
3507 // Helper function for counting indents
3508 fn indents(source: &str) -> usize {
3509 let trimmed = source.trim_left_matches(' ');
3510 source.len() - trimmed.len()
3513 // Test up to 4 spaces of indents (more?)
3515 let mut writer = Vec::new();
3516 write!(&mut writer, "{}
",
3517 super::as_pretty_json(&json).indent(i)).unwrap();
3519 let printed = from_utf8(&writer[..]).unwrap();
3521 // Check for indents at each line
3522 let lines: Vec<&str> = printed.lines().collect();
3523 assert_eq!(lines.len(), 7); // JSON should be 7 lines
3525 assert_eq!(indents(lines[0]), 0 * i); // [
3526 assert_eq!(indents(lines[1]), 1 * i); // "greetings
",
3527 assert_eq!(indents(lines[2]), 1 * i); // {
3528 assert_eq!(indents(lines[3]), 2 * i); // "hello
": "guten tag
",
3529 assert_eq!(indents(lines[4]), 2 * i); // "goodbye
": "sayonara
"
3530 assert_eq!(indents(lines[5]), 1 * i); // },
3531 assert_eq!(indents(lines[6]), 0 * i); // ]
3533 // Finally, test that the pretty-printed JSON is valid
3534 from_str(printed).ok().expect("Pretty
-printed JSON is invalid
!");
3539 fn test_hashmap_with_enum_key() {
3540 use std::collections::HashMap;
3542 #[derive(RustcEncodable, Eq, Hash, PartialEq, RustcDecodable, Debug)]
3548 let mut map = HashMap::new();
3549 map.insert(Enum::Foo, 0);
3550 let result = json::encode(&map).unwrap();
3551 assert_eq!(&result[..], r#"{"Foo":0}
"#);
3552 let decoded: HashMap<Enum, _> = json::decode(&result).unwrap();
3553 assert_eq!(map, decoded);
3557 fn test_hashmap_with_numeric_key_can_handle_double_quote_delimited_key() {
3558 use std::collections::HashMap;
3560 let json_str = "{\"1\":true}
";
3561 let json_obj = match from_str(json_str) {
3562 Err(_) => panic!("Unable to parse json_str
: {:?}
", json_str),
3565 let mut decoder = Decoder::new(json_obj);
3566 let _hm: HashMap<usize, bool> = Decodable::decode(&mut decoder).unwrap();
3570 fn test_hashmap_with_numeric_key_will_error_with_string_keys() {
3571 use std::collections::HashMap;
3573 let json_str = "{\"a\":true}
";
3574 let json_obj = match from_str(json_str) {
3575 Err(_) => panic!("Unable to parse json_str
: {:?}
", json_str),
3578 let mut decoder = Decoder::new(json_obj);
3579 let result: Result<HashMap<usize, bool>, DecoderError> = Decodable::decode(&mut decoder);
3580 assert_eq!(result, Err(ExpectedError("Number
".to_string(), "a
".to_string())));
3583 fn assert_stream_equal(src: &str,
3584 expected: Vec<(JsonEvent, Vec<StackElement>)>) {
3585 let mut parser = Parser::new(src.chars());
3588 let evt = match parser.next() {
3592 let (ref expected_evt, ref expected_stack) = expected[i];
3593 if !parser.stack().is_equal_to(expected_stack) {
3594 panic!("Parser stack is not equal to {:?}
", expected_stack);
3596 assert_eq!(&evt, expected_evt);
3601 #[cfg_attr(target_pointer_width = "32", ignore)] // FIXME(#14064)
3602 fn test_streaming_parser() {
3603 assert_stream_equal(
3604 r#"{ "foo":"bar", "array" : [0, 1, 2, 3, 4, 5], "idents":[null,true,false]}
"#,
3606 (ObjectStart, vec![]),
3607 (StringValue("bar
".to_string()), vec![StackElement::Key("foo
")]),
3608 (ArrayStart, vec![StackElement::Key("array
")]),
3609 (U64Value(0), vec![StackElement::Key("array
"), StackElement::Index(0)]),
3610 (U64Value(1), vec![StackElement::Key("array
"), StackElement::Index(1)]),
3611 (U64Value(2), vec![StackElement::Key("array
"), StackElement::Index(2)]),
3612 (U64Value(3), vec![StackElement::Key("array
"), StackElement::Index(3)]),
3613 (U64Value(4), vec![StackElement::Key("array
"), StackElement::Index(4)]),
3614 (U64Value(5), vec![StackElement::Key("array
"), StackElement::Index(5)]),
3615 (ArrayEnd, vec![StackElement::Key("array
")]),
3616 (ArrayStart, vec![StackElement::Key("idents
")]),
3617 (NullValue, vec![StackElement::Key("idents
"),
3618 StackElement::Index(0)]),
3619 (BooleanValue(true), vec![StackElement::Key("idents
"),
3620 StackElement::Index(1)]),
3621 (BooleanValue(false), vec![StackElement::Key("idents
"),
3622 StackElement::Index(2)]),
3623 (ArrayEnd, vec![StackElement::Key("idents
")]),
3624 (ObjectEnd, vec![]),
3628 fn last_event(src: &str) -> JsonEvent {
3629 let mut parser = Parser::new(src.chars());
3630 let mut evt = NullValue;
3632 evt = match parser.next() {
3640 #[cfg_attr(target_pointer_width = "32", ignore)] // FIXME(#14064)
3641 fn test_read_object_streaming() {
3642 assert_eq!(last_event("{ "), Error(SyntaxError(EOFWhileParsingObject, 1, 3)));
3643 assert_eq!(last_event("{1"), Error(SyntaxError(KeyMustBeAString, 1, 2)));
3644 assert_eq!(last_event("{ \"a
\""), Error(SyntaxError(EOFWhileParsingObject, 1, 6)));
3645 assert_eq!(last_event("{\"a
\""), Error(SyntaxError(EOFWhileParsingObject, 1, 5)));
3646 assert_eq!(last_event("{\"a
\" "), Error(SyntaxError(EOFWhileParsingObject, 1, 6)));
3648 assert_eq!(last_event("{\"a
\" 1"), Error(SyntaxError(ExpectedColon, 1, 6)));
3649 assert_eq!(last_event("{\"a
\":"), Error(SyntaxError(EOFWhileParsingValue, 1, 6)));
3650 assert_eq!(last_event("{\"a
\":1"), Error(SyntaxError(EOFWhileParsingObject, 1, 7)));
3651 assert_eq!(last_event("{\"a
\":1 1"), Error(SyntaxError(InvalidSyntax, 1, 8)));
3652 assert_eq!(last_event("{\"a
\":1,"), Error(SyntaxError(EOFWhileParsingObject, 1, 8)));
3653 assert_eq!(last_event("{\"a\":1,}
"), Error(SyntaxError(TrailingComma, 1, 8)));
3655 assert_stream_equal(
3657 vec![(ObjectStart, vec![]), (ObjectEnd, vec![])]
3659 assert_stream_equal(
3662 (ObjectStart, vec![]),
3663 (U64Value(3), vec![StackElement::Key("a
")]),
3664 (ObjectEnd, vec![]),
3667 assert_stream_equal(
3668 "{ \"a\": null, \"b\" : true }
",
3670 (ObjectStart, vec![]),
3671 (NullValue, vec![StackElement::Key("a
")]),
3672 (BooleanValue(true), vec![StackElement::Key("b
")]),
3673 (ObjectEnd, vec![]),
3676 assert_stream_equal(
3677 "{\"a\" : 1.0 ,\"b\": [ true ]}
",
3679 (ObjectStart, vec![]),
3680 (F64Value(1.0), vec![StackElement::Key("a
")]),
3681 (ArrayStart, vec![StackElement::Key("b
")]),
3682 (BooleanValue(true),vec![StackElement::Key("b
"), StackElement::Index(0)]),
3683 (ArrayEnd, vec![StackElement::Key("b
")]),
3684 (ObjectEnd, vec![]),
3687 assert_stream_equal(
3693 { "c": {"d": null}
}
3697 (ObjectStart, vec![]),
3698 (F64Value(1.0), vec![StackElement::Key("a
")]),
3699 (ArrayStart, vec![StackElement::Key("b
")]),
3700 (BooleanValue(true), vec![StackElement::Key("b
"),
3701 StackElement::Index(0)]),
3702 (StringValue("foo
\nbar
".to_string()), vec![StackElement::Key("b
"),
3703 StackElement::Index(1)]),
3704 (ObjectStart, vec![StackElement::Key("b
"),
3705 StackElement::Index(2)]),
3706 (ObjectStart, vec![StackElement::Key("b
"),
3707 StackElement::Index(2),
3708 StackElement::Key("c
")]),
3709 (NullValue, vec![StackElement::Key("b
"),
3710 StackElement::Index(2),
3711 StackElement::Key("c
"),
3712 StackElement::Key("d
")]),
3713 (ObjectEnd, vec![StackElement::Key("b
"),
3714 StackElement::Index(2),
3715 StackElement::Key("c
")]),
3716 (ObjectEnd, vec![StackElement::Key("b
"),
3717 StackElement::Index(2)]),
3718 (ArrayEnd, vec![StackElement::Key("b
")]),
3719 (ObjectEnd, vec![]),
3724 #[cfg_attr(target_pointer_width = "32", ignore)] // FIXME(#14064)
3725 fn test_read_array_streaming() {
3726 assert_stream_equal(
3729 (ArrayStart, vec![]),
3733 assert_stream_equal(
3736 (ArrayStart, vec![]),
3740 assert_stream_equal(
3743 (ArrayStart, vec![]),
3744 (BooleanValue(true), vec![StackElement::Index(0)]),
3748 assert_stream_equal(
3751 (ArrayStart, vec![]),
3752 (BooleanValue(false), vec![StackElement::Index(0)]),
3756 assert_stream_equal(
3759 (ArrayStart, vec![]),
3760 (NullValue, vec![StackElement::Index(0)]),
3764 assert_stream_equal(
3767 (ArrayStart, vec![]),
3768 (U64Value(3), vec![StackElement::Index(0)]),
3769 (U64Value(1), vec![StackElement::Index(1)]),
3773 assert_stream_equal(
3776 (ArrayStart, vec![]),
3777 (U64Value(3), vec![StackElement::Index(0)]),
3778 (U64Value(2), vec![StackElement::Index(1)]),
3782 assert_stream_equal(
3785 (ArrayStart, vec![]),
3786 (U64Value(2), vec![StackElement::Index(0)]),
3787 (ArrayStart, vec![StackElement::Index(1)]),
3788 (U64Value(4), vec![StackElement::Index(1), StackElement::Index(0)]),
3789 (U64Value(1), vec![StackElement::Index(1), StackElement::Index(1)]),
3790 (ArrayEnd, vec![StackElement::Index(1)]),
3795 assert_eq!(last_event("["), Error(SyntaxError(EOFWhileParsingValue, 1, 2)));
3797 assert_eq!(from_str("["), Err(SyntaxError(EOFWhileParsingValue, 1, 2)));
3798 assert_eq!(from_str("[1"), Err(SyntaxError(EOFWhileParsingArray, 1, 3)));
3799 assert_eq!(from_str("[1,"), Err(SyntaxError(EOFWhileParsingValue, 1, 4)));
3800 assert_eq!(from_str("[1,]"), Err(SyntaxError(InvalidSyntax, 1, 4)));
3801 assert_eq!(from_str("[6 7]"), Err(SyntaxError(InvalidSyntax, 1, 4)));
3805 fn test_trailing_characters_streaming() {
3806 assert_eq!(last_event("nulla
"), Error(SyntaxError(TrailingCharacters, 1, 5)));
3807 assert_eq!(last_event("truea
"), Error(SyntaxError(TrailingCharacters, 1, 5)));
3808 assert_eq!(last_event("falsea
"), Error(SyntaxError(TrailingCharacters, 1, 6)));
3809 assert_eq!(last_event("1a
"), Error(SyntaxError(TrailingCharacters, 1, 2)));
3810 assert_eq!(last_event("[]a
"), Error(SyntaxError(TrailingCharacters, 1, 3)));
3811 assert_eq!(last_event("{}a
"), Error(SyntaxError(TrailingCharacters, 1, 3)));
3814 fn test_read_identifiers_streaming() {
3815 assert_eq!(Parser::new("null
".chars()).next(), Some(NullValue));
3816 assert_eq!(Parser::new("true".chars()).next(), Some(BooleanValue(true)));
3817 assert_eq!(Parser::new("false".chars()).next(), Some(BooleanValue(false)));
3819 assert_eq!(last_event("n
"), Error(SyntaxError(InvalidSyntax, 1, 2)));
3820 assert_eq!(last_event("nul
"), Error(SyntaxError(InvalidSyntax, 1, 4)));
3821 assert_eq!(last_event("t
"), Error(SyntaxError(InvalidSyntax, 1, 2)));
3822 assert_eq!(last_event("truz
"), Error(SyntaxError(InvalidSyntax, 1, 4)));
3823 assert_eq!(last_event("f
"), Error(SyntaxError(InvalidSyntax, 1, 2)));
3824 assert_eq!(last_event("faz
"), Error(SyntaxError(InvalidSyntax, 1, 3)));
3829 let mut stack = Stack::new();
3831 assert!(stack.is_empty());
3832 assert!(stack.is_empty());
3833 assert!(!stack.last_is_index());
3835 stack.push_index(0);
3838 assert!(stack.len() == 1);
3839 assert!(stack.is_equal_to(&[StackElement::Index(1)]));
3840 assert!(stack.starts_with(&[StackElement::Index(1)]));
3841 assert!(stack.ends_with(&[StackElement::Index(1)]));
3842 assert!(stack.last_is_index());
3843 assert!(stack.get(0) == StackElement::Index(1));
3845 stack.push_key("foo
".to_string());
3847 assert!(stack.len() == 2);
3848 assert!(stack.is_equal_to(&[StackElement::Index(1), StackElement::Key("foo
")]));
3849 assert!(stack.starts_with(&[StackElement::Index(1), StackElement::Key("foo
")]));
3850 assert!(stack.starts_with(&[StackElement::Index(1)]));
3851 assert!(stack.ends_with(&[StackElement::Index(1), StackElement::Key("foo
")]));
3852 assert!(stack.ends_with(&[StackElement::Key("foo
")]));
3853 assert!(!stack.last_is_index());
3854 assert!(stack.get(0) == StackElement::Index(1));
3855 assert!(stack.get(1) == StackElement::Key("foo
"));
3857 stack.push_key("bar
".to_string());
3859 assert!(stack.len() == 3);
3860 assert!(stack.is_equal_to(&[StackElement::Index(1),
3861 StackElement::Key("foo
"),
3862 StackElement::Key("bar
")]));
3863 assert!(stack.starts_with(&[StackElement::Index(1)]));
3864 assert!(stack.starts_with(&[StackElement::Index(1), StackElement::Key("foo
")]));
3865 assert!(stack.starts_with(&[StackElement::Index(1),
3866 StackElement::Key("foo
"),
3867 StackElement::Key("bar
")]));
3868 assert!(stack.ends_with(&[StackElement::Key("bar
")]));
3869 assert!(stack.ends_with(&[StackElement::Key("foo
"), StackElement::Key("bar
")]));
3870 assert!(stack.ends_with(&[StackElement::Index(1),
3871 StackElement::Key("foo
"),
3872 StackElement::Key("bar
")]));
3873 assert!(!stack.last_is_index());
3874 assert!(stack.get(0) == StackElement::Index(1));
3875 assert!(stack.get(1) == StackElement::Key("foo
"));
3876 assert!(stack.get(2) == StackElement::Key("bar
"));
3880 assert!(stack.len() == 2);
3881 assert!(stack.is_equal_to(&[StackElement::Index(1), StackElement::Key("foo
")]));
3882 assert!(stack.starts_with(&[StackElement::Index(1), StackElement::Key("foo
")]));
3883 assert!(stack.starts_with(&[StackElement::Index(1)]));
3884 assert!(stack.ends_with(&[StackElement::Index(1), StackElement::Key("foo
")]));
3885 assert!(stack.ends_with(&[StackElement::Key("foo
")]));
3886 assert!(!stack.last_is_index());
3887 assert!(stack.get(0) == StackElement::Index(1));
3888 assert!(stack.get(1) == StackElement::Key("foo
"));
3893 use std::collections::{HashMap,BTreeMap};
3896 let array2 = Array(vec!(U64(1), U64(2)));
3897 let array3 = Array(vec!(U64(1), U64(2), U64(3)));
3899 let mut tree_map = BTreeMap::new();
3900 tree_map.insert("a
".to_string(), U64(1));
3901 tree_map.insert("b
".to_string(), U64(2));
3905 assert_eq!(array2.to_json(), array2);
3906 assert_eq!(object.to_json(), object);
3907 assert_eq!(3_isize.to_json(), I64(3));
3908 assert_eq!(4_i8.to_json(), I64(4));
3909 assert_eq!(5_i16.to_json(), I64(5));
3910 assert_eq!(6_i32.to_json(), I64(6));
3911 assert_eq!(7_i64.to_json(), I64(7));
3912 assert_eq!(8_usize.to_json(), U64(8));
3913 assert_eq!(9_u8.to_json(), U64(9));
3914 assert_eq!(10_u16.to_json(), U64(10));
3915 assert_eq!(11_u32.to_json(), U64(11));
3916 assert_eq!(12_u64.to_json(), U64(12));
3917 assert_eq!(13.0_f32.to_json(), F64(13.0_f64));
3918 assert_eq!(14.0_f64.to_json(), F64(14.0_f64));
3919 assert_eq!(().to_json(), Null);
3920 assert_eq!(f32::INFINITY.to_json(), Null);
3921 assert_eq!(f64::NAN.to_json(), Null);
3922 assert_eq!(true.to_json(), Boolean(true));
3923 assert_eq!(false.to_json(), Boolean(false));
3924 assert_eq!("abc
".to_json(), String("abc
".to_string()));
3925 assert_eq!("abc
".to_string().to_json(), String("abc
".to_string()));
3926 assert_eq!((1_usize, 2_usize).to_json(), array2);
3927 assert_eq!((1_usize, 2_usize, 3_usize).to_json(), array3);
3928 assert_eq!([1_usize, 2_usize].to_json(), array2);
3929 assert_eq!((&[1_usize, 2_usize, 3_usize]).to_json(), array3);
3930 assert_eq!((vec![1_usize, 2_usize]).to_json(), array2);
3931 assert_eq!(vec!(1_usize, 2_usize, 3_usize).to_json(), array3);
3932 let mut tree_map = BTreeMap::new();
3933 tree_map.insert("a
".to_string(), 1 as usize);
3934 tree_map.insert("b
".to_string(), 2);
3935 assert_eq!(tree_map.to_json(), object);
3936 let mut hash_map = HashMap::new();
3937 hash_map.insert("a
".to_string(), 1 as usize);
3938 hash_map.insert("b
".to_string(), 2);
3939 assert_eq!(hash_map.to_json(), object);
3940 assert_eq!(Some(15).to_json(), I64(15));
3941 assert_eq!(Some(15 as usize).to_json(), U64(15));
3942 assert_eq!(None::<isize>.to_json(), Null);
3946 fn test_encode_hashmap_with_arbitrary_key() {
3947 use std::collections::HashMap;
3948 #[derive(PartialEq, Eq, Hash, RustcEncodable)]
3949 struct ArbitraryType(usize);
3950 let mut hm: HashMap<ArbitraryType, bool> = HashMap::new();
3951 hm.insert(ArbitraryType(1), true);
3952 let mut mem_buf = string::String::new();
3953 let mut encoder = Encoder::new(&mut mem_buf);
3954 let result = hm.encode(&mut encoder);
3955 match result.err().unwrap() {
3956 EncoderError::BadHashmapKey => (),
3957 _ => panic!("expected bad hash map key
")
3962 fn bench_streaming_small(b: &mut Bencher) {
3964 let mut parser = Parser::new(
3970 { "c": {"d": null}
}
3975 match parser.next() {
3983 fn bench_small(b: &mut Bencher) {
3985 let _ = from_str(r#"{
3990 { "c": {"d": null}
}
3996 fn big_json() -> string::String {
3997 let mut src = "[\n".to_string();
3999 src.push_str(r#"{ "a": true, "b": null
, "c":3.1415, "d": "Hello world", "e": \
4002 src.push_str("{}
]");
4007 fn bench_streaming_large(b: &mut Bencher) {
4008 let src = big_json();
4010 let mut parser = Parser::new(src.chars());
4012 match parser.next() {
4020 fn bench_large(b: &mut Bencher) {
4021 let src = big_json();
4022 b.iter( || { let _ = from_str(&src); });