rust/src/libstd/json.rs

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// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
// Rust JSON serialization library
// Copyright (c) 2011 Google Inc.
#[forbid(non_camel_case_types)];
//! json serialization
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use serialize::Encodable;
use serialize;
use sort::Sort;
use core::char;
use core::cmp::{Eq, Ord};
use core::float;
use core::io::{WriterUtil, ReaderUtil};
use core::io;
use core::prelude::*;
use core::hashmap::linear::LinearMap;
use core::str;
use core::to_str;
use core::vec;
/// Represents a json value
pub enum Json {
Number(float),
String(~str),
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Boolean(bool),
List(List),
Object(~Object),
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Null,
}
pub type List = ~[Json];
pub type Object = LinearMap<~str, Json>;
pub struct Error {
line: uint,
col: uint,
msg: @~str,
}
fn escape_str(s: &str) -> ~str {
let mut escaped = ~"\"";
for str::chars_each(s) |c| {
match c {
'"' => escaped += ~"\\\"",
'\\' => escaped += ~"\\\\",
'\x08' => escaped += ~"\\b",
'\x0c' => escaped += ~"\\f",
'\n' => escaped += ~"\\n",
'\r' => escaped += ~"\\r",
'\t' => escaped += ~"\\t",
_ => escaped += str::from_char(c)
}
};
escaped += ~"\"";
escaped
}
fn spaces(n: uint) -> ~str {
let mut ss = ~"";
for n.times { str::push_str(&mut ss, " "); }
return ss;
}
pub struct Encoder {
priv wr: io::Writer,
}
pub fn Encoder(wr: io::Writer) -> Encoder {
Encoder { wr: wr }
}
pub impl serialize::Encoder for Encoder {
fn emit_nil(&self) { self.wr.write_str("null") }
fn emit_uint(&self, v: uint) { self.emit_float(v as float); }
fn emit_u64(&self, v: u64) { self.emit_float(v as float); }
fn emit_u32(&self, v: u32) { self.emit_float(v as float); }
fn emit_u16(&self, v: u16) { self.emit_float(v as float); }
fn emit_u8(&self, v: u8) { self.emit_float(v as float); }
fn emit_int(&self, v: int) { self.emit_float(v as float); }
fn emit_i64(&self, v: i64) { self.emit_float(v as float); }
fn emit_i32(&self, v: i32) { self.emit_float(v as float); }
fn emit_i16(&self, v: i16) { self.emit_float(v as float); }
fn emit_i8(&self, v: i8) { self.emit_float(v as float); }
fn emit_bool(&self, v: bool) {
if v {
self.wr.write_str("true");
} else {
self.wr.write_str("false");
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}
}
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fn emit_f64(&self, v: f64) { self.emit_float(v as float); }
fn emit_f32(&self, v: f32) { self.emit_float(v as float); }
fn emit_float(&self, v: float) {
self.wr.write_str(float::to_str_digits(v, 6u));
}
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fn emit_char(&self, v: char) { self.emit_borrowed_str(str::from_char(v)) }
fn emit_borrowed_str(&self, v: &str) { self.wr.write_str(escape_str(v)) }
fn emit_owned_str(&self, v: &str) { self.emit_borrowed_str(v) }
fn emit_managed_str(&self, v: &str) { self.emit_borrowed_str(v) }
fn emit_borrowed(&self, f: fn()) { f() }
fn emit_owned(&self, f: fn()) { f() }
fn emit_managed(&self, f: fn()) { f() }
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fn emit_enum(&self, _name: &str, f: fn()) {
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f()
}
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fn emit_enum_variant(&self, name: &str, _id: uint, _cnt: uint, f: fn()) {
// encoding of enums is special-cased for Option. Specifically:
// Some(34) => 34
// None => null
// other enums are encoded as vectors:
// Kangaroo(34,"William") => ["Kangaroo",[34,"William"]]
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// the default expansion for enums is more verbose than I'd like;
// specifically, the inner pair of brackets seems superfluous,
// BUT the design of the enumeration framework and the requirements
// of the special-case for Option mean that a first argument must
// be encoded "naked"--with no commas--and that the option name
// can't be followed by just a comma, because there might not
// be any elements in the tuple.
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// FIXME #4872: this would be more precise and less frightening
// with fully-qualified option names. To get that information,
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// we'd have to change the expansion of auto-encode to pass
// those along.
if (name == ~"Some") {
f();
} else if (name == ~"None") {
self.wr.write_str(~"null");
} else {
self.wr.write_char('[');
self.wr.write_str(escape_str(name));
self.wr.write_char(',');
self.wr.write_char('[');
f();
self.wr.write_char(']');
self.wr.write_char(']');
}
}
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fn emit_enum_variant_arg(&self, idx: uint, f: fn()) {
if (idx != 0) {self.wr.write_char(',');}
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f();
}
fn emit_borrowed_vec(&self, _len: uint, f: fn()) {
self.wr.write_char('[');
f();
self.wr.write_char(']');
}
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fn emit_owned_vec(&self, len: uint, f: fn()) {
self.emit_borrowed_vec(len, f)
}
fn emit_managed_vec(&self, len: uint, f: fn()) {
self.emit_borrowed_vec(len, f)
}
fn emit_vec_elt(&self, idx: uint, f: fn()) {
if idx != 0 { self.wr.write_char(','); }
f()
}
fn emit_rec(&self, f: fn()) {
self.wr.write_char('{');
f();
self.wr.write_char('}');
}
fn emit_struct(&self, _name: &str, _len: uint, f: fn()) {
self.wr.write_char('{');
f();
self.wr.write_char('}');
}
fn emit_field(&self, name: &str, idx: uint, f: fn()) {
if idx != 0 { self.wr.write_char(','); }
self.wr.write_str(escape_str(name));
self.wr.write_char(':');
f();
}
fn emit_tup(&self, len: uint, f: fn()) {
self.emit_borrowed_vec(len, f);
}
fn emit_tup_elt(&self, idx: uint, f: fn()) {
self.emit_vec_elt(idx, f)
}
}
pub struct PrettyEncoder {
priv wr: io::Writer,
priv mut indent: uint,
}
pub fn PrettyEncoder(wr: io::Writer) -> PrettyEncoder {
PrettyEncoder { wr: wr, indent: 0 }
}
pub impl serialize::Encoder for PrettyEncoder {
fn emit_nil(&self) { self.wr.write_str("null") }
fn emit_uint(&self, v: uint) { self.emit_float(v as float); }
fn emit_u64(&self, v: u64) { self.emit_float(v as float); }
fn emit_u32(&self, v: u32) { self.emit_float(v as float); }
fn emit_u16(&self, v: u16) { self.emit_float(v as float); }
fn emit_u8(&self, v: u8) { self.emit_float(v as float); }
fn emit_int(&self, v: int) { self.emit_float(v as float); }
fn emit_i64(&self, v: i64) { self.emit_float(v as float); }
fn emit_i32(&self, v: i32) { self.emit_float(v as float); }
fn emit_i16(&self, v: i16) { self.emit_float(v as float); }
fn emit_i8(&self, v: i8) { self.emit_float(v as float); }
fn emit_bool(&self, v: bool) {
if v {
self.wr.write_str("true");
} else {
self.wr.write_str("false");
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}
}
fn emit_f64(&self, v: f64) { self.emit_float(v as float); }
fn emit_f32(&self, v: f32) { self.emit_float(v as float); }
fn emit_float(&self, v: float) {
self.wr.write_str(float::to_str_digits(v, 6u));
}
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fn emit_char(&self, v: char) { self.emit_borrowed_str(str::from_char(v)) }
fn emit_borrowed_str(&self, v: &str) { self.wr.write_str(escape_str(v)); }
fn emit_owned_str(&self, v: &str) { self.emit_borrowed_str(v) }
fn emit_managed_str(&self, v: &str) { self.emit_borrowed_str(v) }
fn emit_borrowed(&self, f: fn()) { f() }
fn emit_owned(&self, f: fn()) { f() }
fn emit_managed(&self, f: fn()) { f() }
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fn emit_enum(&self, name: &str, f: fn()) {
if name != "option" { fail!(~"only supports option enum") }
f()
}
fn emit_enum_variant(&self, _name: &str, id: uint, _cnt: uint, f: fn()) {
if id == 0 {
self.emit_nil();
} else {
f()
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}
}
fn emit_enum_variant_arg(&self, _idx: uint, f: fn()) {
f()
}
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fn emit_borrowed_vec(&self, _len: uint, f: fn()) {
self.wr.write_char('[');
self.indent += 2;
f();
self.indent -= 2;
self.wr.write_char(']');
}
fn emit_owned_vec(&self, len: uint, f: fn()) {
self.emit_borrowed_vec(len, f)
}
fn emit_managed_vec(&self, len: uint, f: fn()) {
self.emit_borrowed_vec(len, f)
}
fn emit_vec_elt(&self, idx: uint, f: fn()) {
if idx == 0 {
self.wr.write_char('\n');
} else {
self.wr.write_str(",\n");
}
self.wr.write_str(spaces(self.indent));
f()
}
fn emit_rec(&self, f: fn()) {
self.wr.write_char('{');
self.indent += 2;
f();
self.indent -= 2;
self.wr.write_char('}');
}
fn emit_struct(&self, _name: &str, _len: uint, f: fn()) {
self.emit_rec(f)
}
fn emit_field(&self, name: &str, idx: uint, f: fn()) {
if idx == 0 {
self.wr.write_char('\n');
} else {
self.wr.write_str(",\n");
}
self.wr.write_str(spaces(self.indent));
self.wr.write_str(escape_str(name));
self.wr.write_str(": ");
f();
}
fn emit_tup(&self, sz: uint, f: fn()) {
self.emit_borrowed_vec(sz, f);
}
fn emit_tup_elt(&self, idx: uint, f: fn()) {
self.emit_vec_elt(idx, f)
}
}
pub impl<S:serialize::Encoder> serialize::Encodable<S> for Json {
fn encode(&self, s: &S) {
match *self {
Number(v) => v.encode(s),
String(ref v) => v.encode(s),
Boolean(v) => v.encode(s),
List(ref v) => v.encode(s),
Object(ref v) => {
do s.emit_rec || {
let mut idx = 0;
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for v.each |&(key, value)| {
do s.emit_field(*key, idx) {
value.encode(s);
}
idx += 1;
}
}
},
Null => s.emit_nil(),
}
}
}
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/// Encodes a json value into a io::writer
pub fn to_writer(wr: io::Writer, json: &Json) {
json.encode(&Encoder(wr))
}
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/// Encodes a json value into a string
pub pure fn to_str(json: &Json) -> ~str {
unsafe {
// ugh, should be safe
io::with_str_writer(|wr| to_writer(wr, json))
}
}
/// Encodes a json value into a io::writer
pub fn to_pretty_writer(wr: io::Writer, json: &Json) {
json.encode(&PrettyEncoder(wr))
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}
/// Encodes a json value into a string
pub fn to_pretty_str(json: &Json) -> ~str {
io::with_str_writer(|wr| to_pretty_writer(wr, json))
}
pub struct Parser {
priv rdr: io::Reader,
priv mut ch: char,
priv mut line: uint,
priv mut col: uint,
}
/// Decode a json value from an io::reader
pub fn Parser(rdr: io::Reader) -> Parser {
Parser {
rdr: rdr,
ch: rdr.read_char(),
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line: 1,
col: 1,
}
}
pub impl Parser {
fn parse() -> Result<Json, Error> {
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match self.parse_value() {
Ok(value) => {
// Skip trailing whitespaces.
self.parse_whitespace();
// Make sure there is no trailing characters.
if self.eof() {
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Ok(value)
} else {
self.error(~"trailing characters")
}
}
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Err(e) => Err(e)
}
}
}
priv impl Parser {
fn eof() -> bool { self.ch == -1 as char }
fn bump() {
self.ch = self.rdr.read_char();
if self.ch == '\n' {
self.line += 1u;
self.col = 1u;
} else {
self.col += 1u;
}
}
fn next_char() -> char {
self.bump();
self.ch
}
fn error<T>(msg: ~str) -> Result<T, Error> {
Err(Error { line: self.line, col: self.col, msg: @msg })
}
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fn parse_value() -> Result<Json, Error> {
self.parse_whitespace();
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if self.eof() { return self.error(~"EOF while parsing value"); }
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match self.ch {
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'n' => self.parse_ident(~"ull", Null),
't' => self.parse_ident(~"rue", Boolean(true)),
'f' => self.parse_ident(~"alse", Boolean(false)),
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'0' .. '9' | '-' => self.parse_number(),
'"' =>
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match self.parse_str() {
Ok(s) => Ok(String(s)),
Err(e) => Err(e),
},
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'[' => self.parse_list(),
'{' => self.parse_object(),
_ => self.error(~"invalid syntax")
}
}
fn parse_whitespace() {
while char::is_whitespace(self.ch) { self.bump(); }
}
fn parse_ident(ident: &str, value: Json) -> Result<Json, Error> {
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if str::all(ident, |c| c == self.next_char()) {
self.bump();
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Ok(value)
} else {
self.error(~"invalid syntax")
}
}
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fn parse_number() -> Result<Json, Error> {
let mut neg = 1f;
if self.ch == '-' {
self.bump();
neg = -1f;
}
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let mut res = match self.parse_integer() {
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Ok(res) => res,
Err(e) => return Err(e)
};
if self.ch == '.' {
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match self.parse_decimal(res) {
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Ok(r) => res = r,
Err(e) => return Err(e)
}
}
if self.ch == 'e' || self.ch == 'E' {
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match self.parse_exponent(res) {
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Ok(r) => res = r,
Err(e) => return Err(e)
}
}
Ok(Number(neg * res))
}
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fn parse_integer() -> Result<float, Error> {
let mut res = 0f;
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match self.ch {
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'0' => {
self.bump();
// There can be only one leading '0'.
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match self.ch {
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'0' .. '9' => return self.error(~"invalid number"),
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_ => ()
}
}
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'1' .. '9' => {
while !self.eof() {
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match self.ch {
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'0' .. '9' => {
res *= 10f;
res += ((self.ch as int) - ('0' as int)) as float;
self.bump();
}
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_ => break
}
}
}
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_ => return self.error(~"invalid number")
}
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Ok(res)
}
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fn parse_decimal(res: float) -> Result<float, Error> {
self.bump();
// Make sure a digit follows the decimal place.
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match self.ch {
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'0' .. '9' => (),
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_ => return self.error(~"invalid number")
}
let mut res = res;
let mut dec = 1f;
while !self.eof() {
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match self.ch {
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'0' .. '9' => {
dec /= 10f;
res += (((self.ch as int) - ('0' as int)) as float) * dec;
self.bump();
}
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_ => break
}
}
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Ok(res)
}
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fn parse_exponent(res: float) -> Result<float, Error> {
self.bump();
let mut res = res;
let mut exp = 0u;
let mut neg_exp = false;
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match self.ch {
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'+' => self.bump(),
'-' => { self.bump(); neg_exp = true; }
_ => ()
}
// Make sure a digit follows the exponent place.
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match self.ch {
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'0' .. '9' => (),
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_ => return self.error(~"invalid number")
}
while !self.eof() {
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match self.ch {
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'0' .. '9' => {
exp *= 10u;
exp += (self.ch as uint) - ('0' as uint);
self.bump();
}
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_ => break
}
}
let exp = float::pow_with_uint(10u, exp);
if neg_exp {
res /= exp;
} else {
res *= exp;
}
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Ok(res)
}
fn parse_str() -> Result<~str, Error> {
let mut escape = false;
let mut res = ~"";
while !self.eof() {
self.bump();
if (escape) {
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match self.ch {
'"' => str::push_char(&mut res, '"'),
'\\' => str::push_char(&mut res, '\\'),
'/' => str::push_char(&mut res, '/'),
'b' => str::push_char(&mut res, '\x08'),
'f' => str::push_char(&mut res, '\x0c'),
'n' => str::push_char(&mut res, '\n'),
'r' => str::push_char(&mut res, '\r'),
't' => str::push_char(&mut res, '\t'),
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'u' => {
// Parse \u1234.
let mut i = 0u;
let mut n = 0u;
while i < 4u {
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match self.next_char() {
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'0' .. '9' => {
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n = n * 16u + (self.ch as uint)
- ('0' as uint);
},
'a' | 'A' => n = n * 16u + 10u,
'b' | 'B' => n = n * 16u + 11u,
'c' | 'C' => n = n * 16u + 12u,
'd' | 'D' => n = n * 16u + 13u,
'e' | 'E' => n = n * 16u + 14u,
'f' | 'F' => n = n * 16u + 15u,
_ => return self.error(
~"invalid \\u escape (unrecognized hex)")
}
i += 1u;
}
// Error out if we didn't parse 4 digits.
if i != 4u {
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return self.error(
~"invalid \\u escape (not four digits)");
}
str::push_char(&mut res, n as char);
}
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_ => return self.error(~"invalid escape")
}
escape = false;
} else if self.ch == '\\' {
escape = true;
} else {
if self.ch == '"' {
self.bump();
return Ok(res);
}
str::push_char(&mut res, self.ch);
}
}
self.error(~"EOF while parsing string")
}
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fn parse_list() -> Result<Json, Error> {
self.bump();
self.parse_whitespace();
let mut values = ~[];
if self.ch == ']' {
self.bump();
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return Ok(List(values));
}
loop {
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match self.parse_value() {
Ok(v) => values.push(v),
Err(e) => return Err(e)
}
self.parse_whitespace();
if self.eof() {
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return self.error(~"EOF while parsing list");
}
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match self.ch {
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',' => self.bump(),
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']' => { self.bump(); return Ok(List(values)); }
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_ => return self.error(~"expected `,` or `]`")
}
};
}
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fn parse_object() -> Result<Json, Error> {
self.bump();
self.parse_whitespace();
let mut values = ~LinearMap::new();
if self.ch == '}' {
self.bump();
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return Ok(Object(values));
}
while !self.eof() {
self.parse_whitespace();
if self.ch != '"' {
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return self.error(~"key must be a string");
}
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let key = match self.parse_str() {
Ok(key) => key,
Err(e) => return Err(e)
};
self.parse_whitespace();
if self.ch != ':' {
if self.eof() { break; }
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return self.error(~"expected `:`");
}
self.bump();
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match self.parse_value() {
Ok(value) => { values.insert(key, value); }
Err(e) => return Err(e)
}
self.parse_whitespace();
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match self.ch {
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',' => self.bump(),
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'}' => { self.bump(); return Ok(Object(values)); }
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_ => {
if self.eof() { break; }
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return self.error(~"expected `,` or `}`");
}
}
}
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return self.error(~"EOF while parsing object");
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}
}
/// Decodes a json value from an io::reader
pub fn from_reader(rdr: io::Reader) -> Result<Json, Error> {
Parser(rdr).parse()
}
/// Decodes a json value from a string
pub fn from_str(s: &str) -> Result<Json, Error> {
do io::with_str_reader(s) |rdr| {
from_reader(rdr)
}
}
pub struct Decoder {
priv json: Json,
priv mut stack: ~[&Json],
}
pub fn Decoder(json: Json) -> Decoder {
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Decoder { json: json, stack: ~[] }
}
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priv impl Decoder {
fn peek(&self) -> &self/Json {
if self.stack.len() == 0 { self.stack.push(&self.json); }
vec::last(self.stack)
}
fn pop(&self) -> &self/Json {
if self.stack.len() == 0 { self.stack.push(&self.json); }
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self.stack.pop()
}
}
pub impl serialize::Decoder for Decoder {
fn read_nil(&self) -> () {
debug!("read_nil");
match *self.pop() {
Null => (),
_ => fail!(~"not a null")
}
}
fn read_u64(&self) -> u64 { self.read_float() as u64 }
fn read_u32(&self) -> u32 { self.read_float() as u32 }
fn read_u16(&self) -> u16 { self.read_float() as u16 }
fn read_u8 (&self) -> u8 { self.read_float() as u8 }
fn read_uint(&self) -> uint { self.read_float() as uint }
fn read_i64(&self) -> i64 { self.read_float() as i64 }
fn read_i32(&self) -> i32 { self.read_float() as i32 }
fn read_i16(&self) -> i16 { self.read_float() as i16 }
fn read_i8 (&self) -> i8 { self.read_float() as i8 }
fn read_int(&self) -> int { self.read_float() as int }
fn read_bool(&self) -> bool {
debug!("read_bool");
match *self.pop() {
Boolean(b) => b,
_ => fail!(~"not a boolean")
}
}
fn read_f64(&self) -> f64 { self.read_float() as f64 }
fn read_f32(&self) -> f32 { self.read_float() as f32 }
fn read_float(&self) -> float {
debug!("read_float");
match *self.pop() {
Number(f) => f,
_ => fail!(~"not a number")
}
}
fn read_char(&self) -> char {
let v = str::chars(self.read_owned_str());
if v.len() != 1 { fail!(~"string must have one character") }
v[0]
}
fn read_owned_str(&self) -> ~str {
debug!("read_owned_str");
match *self.pop() {
String(ref s) => copy *s,
_ => fail!(~"not a string")
}
}
fn read_managed_str(&self) -> @str {
debug!("read_managed_str");
match *self.pop() {
String(ref s) => s.to_managed(),
_ => fail!(~"not a string")
}
}
fn read_owned<T>(&self, f: fn() -> T) -> T {
debug!("read_owned()");
f()
}
fn read_managed<T>(&self, f: fn() -> T) -> T {
debug!("read_managed()");
f()
}
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fn read_enum<T>(&self, name: &str, f: fn() -> T) -> T {
debug!("read_enum(%s)", name);
if name != ~"option" { fail!(~"only supports the option enum") }
f()
}
fn read_enum_variant<T>(&self, f: fn(uint) -> T) -> T {
debug!("read_enum_variant()");
let idx = match *self.peek() {
Null => 0,
_ => 1,
};
f(idx)
}
fn read_enum_variant_arg<T>(&self, idx: uint, f: fn() -> T) -> T {
debug!("read_enum_variant_arg(idx=%u)", idx);
if idx != 0 { fail!(~"unknown index") }
f()
}
fn read_owned_vec<T>(&self, f: fn(uint) -> T) -> T {
debug!("read_owned_vec()");
let len = match *self.peek() {
List(ref list) => list.len(),
_ => fail!(~"not a list"),
};
let res = f(len);
self.pop();
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res
}
fn read_managed_vec<T>(&self, f: fn(uint) -> T) -> T {
debug!("read_owned_vec()");
let len = match *self.peek() {
List(ref list) => list.len(),
_ => fail!(~"not a list"),
};
let res = f(len);
self.pop();
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res
}
fn read_vec_elt<T>(&self, idx: uint, f: fn() -> T) -> T {
debug!("read_vec_elt(idx=%u)", idx);
match *self.peek() {
List(ref list) => {
self.stack.push(&list[idx]);
f()
}
_ => fail!(~"not a list"),
}
}
fn read_rec<T>(&self, f: fn() -> T) -> T {
debug!("read_rec()");
let value = f();
self.pop();
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value
}
fn read_struct<T>(&self, _name: &str, _len: uint, f: fn() -> T) -> T {
debug!("read_struct()");
let value = f();
self.pop();
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value
}
fn read_field<T>(&self, name: &str, idx: uint, f: fn() -> T) -> T {
debug!("read_rec_field(%s, idx=%u)", name, idx);
let top = self.peek();
match *top {
Object(ref obj) => {
match obj.find(&name.to_owned()) {
None => fail!(fmt!("no such field: %s", name)),
Some(json) => {
self.stack.push(json);
f()
}
}
}
Number(_) => fail!(~"num"),
String(_) => fail!(~"str"),
Boolean(_) => fail!(~"bool"),
List(_) => fail!(fmt!("list: %?", top)),
Null => fail!(~"null"),
//_ => fail!(fmt!("not an object: %?", *top))
}
}
fn read_tup<T>(&self, len: uint, f: fn() -> T) -> T {
debug!("read_tup(len=%u)", len);
let value = f();
self.pop();
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value
}
fn read_tup_elt<T>(&self, idx: uint, f: fn() -> T) -> T {
debug!("read_tup_elt(idx=%u)", idx);
match *self.peek() {
List(ref list) => {
self.stack.push(&list[idx]);
f()
}
_ => fail!(~"not a list")
}
}
}
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impl Eq for Json {
pure fn eq(&self, other: &Json) -> bool {
match (self) {
&Number(f0) =>
match other { &Number(f1) => f0 == f1, _ => false },
&String(ref s0) =>
match other { &String(ref s1) => s0 == s1, _ => false },
&Boolean(b0) =>
match other { &Boolean(b1) => b0 == b1, _ => false },
&Null =>
match other { &Null => true, _ => false },
&List(ref v0) =>
match other { &List(ref v1) => v0 == v1, _ => false },
&Object(ref d0) => {
match other {
&Object(ref d1) => {
if d0.len() == d1.len() {
let mut equal = true;
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for d0.each |&(k, v0)| {
match d1.find(k) {
Some(v1) if v0 == v1 => { },
_ => { equal = false; break }
}
};
equal
} else {
false
}
}
_ => false
}
}
}
}
pure fn ne(&self, other: &Json) -> bool { !self.eq(other) }
}
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/// Test if two json values are less than one another
impl Ord for Json {
pure fn lt(&self, other: &Json) -> bool {
match (*self) {
Number(f0) => {
match *other {
Number(f1) => f0 < f1,
String(_) | Boolean(_) | List(_) | Object(_) |
Null => true
}
}
String(ref s0) => {
match *other {
Number(_) => false,
String(ref s1) => s0 < s1,
Boolean(_) | List(_) | Object(_) | Null => true
}
}
Boolean(b0) => {
match *other {
Number(_) | String(_) => false,
Boolean(b1) => b0 < b1,
List(_) | Object(_) | Null => true
}
}
List(ref l0) => {
match *other {
Number(_) | String(_) | Boolean(_) => false,
List(ref l1) => (*l0) < (*l1),
Object(_) | Null => true
}
}
Object(ref d0) => {
match *other {
Number(_) | String(_) | Boolean(_) | List(_) => false,
Object(ref d1) => {
unsafe {
let mut d0_flat = ~[];
let mut d1_flat = ~[];
// FIXME #4430: this is horribly inefficient...
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for d0.each |&(k, v)| {
d0_flat.push((@copy *k, @copy *v));
}
d0_flat.qsort();
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for d1.each |&(k, v)| {
d1_flat.push((@copy *k, @copy *v));
}
d1_flat.qsort();
d0_flat < d1_flat
}
}
Null => true
}
}
Null => {
match *other {
Number(_) | String(_) | Boolean(_) | List(_) |
Object(_) =>
false,
Null => true
}
}
}
}
pure fn le(&self, other: &Json) -> bool { !(*other).lt(&(*self)) }
pure fn ge(&self, other: &Json) -> bool { !(*self).lt(other) }
pure fn gt(&self, other: &Json) -> bool { (*other).lt(&(*self)) }
}
impl Eq for Error {
pure fn eq(&self, other: &Error) -> bool {
(*self).line == other.line &&
(*self).col == other.col &&
(*self).msg == other.msg
}
pure fn ne(&self, other: &Error) -> bool { !(*self).eq(other) }
}
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trait ToJson { fn to_json() -> Json; }
impl ToJson for Json {
fn to_json() -> Json { copy self }
}
impl ToJson for @Json {
fn to_json() -> Json { (*self).to_json() }
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}
impl ToJson for int {
fn to_json() -> Json { Number(self as float) }
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}
impl ToJson for i8 {
fn to_json() -> Json { Number(self as float) }
}
impl ToJson for i16 {
fn to_json() -> Json { Number(self as float) }
}
impl ToJson for i32 {
fn to_json() -> Json { Number(self as float) }
}
impl ToJson for i64 {
fn to_json() -> Json { Number(self as float) }
}
impl ToJson for uint {
fn to_json() -> Json { Number(self as float) }
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}
impl ToJson for u8 {
fn to_json() -> Json { Number(self as float) }
}
impl ToJson for u16 {
fn to_json() -> Json { Number(self as float) }
}
impl ToJson for u32 {
fn to_json() -> Json { Number(self as float) }
}
impl ToJson for u64 {
fn to_json() -> Json { Number(self as float) }
}
impl ToJson for float {
fn to_json() -> Json { Number(self) }
}
impl ToJson for f32 {
fn to_json() -> Json { Number(self as float) }
}
impl ToJson for f64 {
fn to_json() -> Json { Number(self as float) }
}
impl ToJson for () {
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fn to_json() -> Json { Null }
}
impl ToJson for bool {
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fn to_json() -> Json { Boolean(self) }
}
impl ToJson for ~str {
fn to_json() -> Json { String(copy self) }
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}
impl ToJson for @~str {
fn to_json() -> Json { String(copy *self) }
}
impl<A:ToJson,B:ToJson> ToJson for (A, B) {
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fn to_json() -> Json {
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match self {
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(ref a, ref b) => {
List(~[a.to_json(), b.to_json()])
}
}
}
}
impl<A:ToJson,B:ToJson,C:ToJson> ToJson for (A, B, C) {
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fn to_json() -> Json {
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match self {
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(ref a, ref b, ref c) => {
List(~[a.to_json(), b.to_json(), c.to_json()])
}
}
}
}
impl<A:ToJson> ToJson for ~[A] {
fn to_json() -> Json { List(self.map(|elt| elt.to_json())) }
}
impl<A:ToJson + Copy> ToJson for LinearMap<~str, A> {
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fn to_json() -> Json {
let mut d = LinearMap::new();
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for self.each |&(key, value)| {
d.insert(copy *key, value.to_json());
}
Object(~d)
}
}
impl<A:ToJson> ToJson for Option<A> {
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fn to_json() -> Json {
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match self {
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None => Null,
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Some(ref value) => value.to_json()
}
}
}
impl to_str::ToStr for Json {
pure fn to_str(&self) -> ~str { to_str(self) }
}
impl to_str::ToStr for Error {
pure fn to_str(&self) -> ~str {
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fmt!("%u:%u: %s", self.line, self.col, *self.msg)
}
}
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#[cfg(test)]
mod tests {
use core::prelude::*;
use json::*;
use core::result;
use core::hashmap::linear::LinearMap;
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use core::cmp;
fn mk_object(items: &[(~str, Json)]) -> Json {
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let mut d = ~LinearMap::new();
for items.each |item| {
match *item {
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(copy key, copy value) => { d.insert(key, value); },
}
};
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Object(d)
}
#[test]
fn test_write_null() {
assert to_str(&Null) == ~"null";
}
#[test]
fn test_write_number() {
assert to_str(&Number(3f)) == ~"3";
assert to_str(&Number(3.1f)) == ~"3.1";
assert to_str(&Number(-1.5f)) == ~"-1.5";
assert to_str(&Number(0.5f)) == ~"0.5";
}
#[test]
fn test_write_str() {
assert to_str(&String(~"")) == ~"\"\"";
assert to_str(&String(~"foo")) == ~"\"foo\"";
}
#[test]
fn test_write_bool() {
assert to_str(&Boolean(true)) == ~"true";
assert to_str(&Boolean(false)) == ~"false";
}
#[test]
fn test_write_list() {
assert to_str(&List(~[])) == ~"[]";
assert to_str(&List(~[Boolean(true)])) == ~"[true]";
assert to_str(&List(~[
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Boolean(false),
Null,
List(~[String(~"foo\nbar"), Number(3.5f)])
])) == ~"[false,null,[\"foo\\nbar\",3.5]]";
}
#[test]
fn test_write_object() {
assert to_str(&mk_object(~[])) == ~"{}";
assert to_str(&mk_object(~[(~"a", Boolean(true))]))
== ~"{\"a\":true}";
let a = mk_object(~[
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(~"a", Boolean(true)),
(~"b", List(~[
mk_object(~[(~"c", String(~"\x0c\r"))]),
mk_object(~[(~"d", String(~""))])
]))
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]);
// We can't compare the strings directly because the object fields be
// printed in a different order.
let b = result::unwrap(from_str(to_str(&a)));
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assert a == b;
}
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// two fns copied from libsyntax/util/testing.rs.
// Should they be in their own crate?
pub pure fn check_equal_ptr<T:cmp::Eq> (given : &T, expected: &T) {
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if !((given == expected) && (expected == given )) {
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fail!(fmt!("given %?, expected %?",given,expected));
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}
}
pub pure fn check_equal<T:cmp::Eq> (given : T, expected: T) {
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if !((given == expected) && (expected == given )) {
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fail!(fmt!("given %?, expected %?",given,expected));
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}
}
#[test]
fn test_write_enum () {
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let bw = @io::BytesWriter();
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let bww : @io::Writer = (bw as @io::Writer);
let encoder = (@Encoder(bww) as @serialize::Encoder);
do encoder.emit_enum(~"animal") {
do encoder.emit_enum_variant (~"frog",37,1242) {
// name of frog:
do encoder.emit_enum_variant_arg (0) {
encoder.emit_owned_str(~"Henry")
}
// mass of frog in grams:
do encoder.emit_enum_variant_arg (1) {
encoder.emit_int(349);
}
}
}
check_equal(str::from_bytes(bw.bytes.data),
~"[\"frog\",[\"Henry\",349]]");
}
#[test]
fn test_write_some () {
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let bw = @io::BytesWriter();
let bww : @io::Writer = (bw as @io::Writer);
let encoder = (@Encoder(bww) as @serialize::Encoder);
do encoder.emit_enum(~"Option") {
do encoder.emit_enum_variant (~"Some",37,1242) {
do encoder.emit_enum_variant_arg (0) {
encoder.emit_owned_str(~"jodhpurs")
}
}
}
check_equal(str::from_bytes(bw.bytes.data),
~"\"jodhpurs\"");
}
#[test]
fn test_write_none () {
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let bw = @io::BytesWriter();
let bww : @io::Writer = (bw as @io::Writer);
let encoder = (@Encoder(bww) as @serialize::Encoder);
do encoder.emit_enum(~"Option") {
do encoder.emit_enum_variant (~"None",37,1242) {
}
}
check_equal(str::from_bytes(bw.bytes.data),
~"null");
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}
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#[test]
fn test_trailing_characters() {
assert from_str(~"nulla") ==
Err(Error {line: 1u, col: 5u, msg: @~"trailing characters"});
assert from_str(~"truea") ==
Err(Error {line: 1u, col: 5u, msg: @~"trailing characters"});
assert from_str(~"falsea") ==
Err(Error {line: 1u, col: 6u, msg: @~"trailing characters"});
assert from_str(~"1a") ==
Err(Error {line: 1u, col: 2u, msg: @~"trailing characters"});
assert from_str(~"[]a") ==
Err(Error {line: 1u, col: 3u, msg: @~"trailing characters"});
assert from_str(~"{}a") ==
Err(Error {line: 1u, col: 3u, msg: @~"trailing characters"});
}
#[test]
fn test_read_identifiers() {
assert from_str(~"n") ==
Err(Error {line: 1u, col: 2u, msg: @~"invalid syntax"});
assert from_str(~"nul") ==
Err(Error {line: 1u, col: 4u, msg: @~"invalid syntax"});
assert from_str(~"t") ==
Err(Error {line: 1u, col: 2u, msg: @~"invalid syntax"});
assert from_str(~"truz") ==
Err(Error {line: 1u, col: 4u, msg: @~"invalid syntax"});
assert from_str(~"f") ==
Err(Error {line: 1u, col: 2u, msg: @~"invalid syntax"});
assert from_str(~"faz") ==
Err(Error {line: 1u, col: 3u, msg: @~"invalid syntax"});
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assert from_str(~"null") == Ok(Null);
assert from_str(~"true") == Ok(Boolean(true));
assert from_str(~"false") == Ok(Boolean(false));
assert from_str(~" null ") == Ok(Null);
assert from_str(~" true ") == Ok(Boolean(true));
assert from_str(~" false ") == Ok(Boolean(false));
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}
#[test]
fn test_read_number() {
assert from_str(~"+") ==
Err(Error {line: 1u, col: 1u, msg: @~"invalid syntax"});
assert from_str(~".") ==
Err(Error {line: 1u, col: 1u, msg: @~"invalid syntax"});
assert from_str(~"-") ==
Err(Error {line: 1u, col: 2u, msg: @~"invalid number"});
assert from_str(~"00") ==
Err(Error {line: 1u, col: 2u, msg: @~"invalid number"});
assert from_str(~"1.") ==
Err(Error {line: 1u, col: 3u, msg: @~"invalid number"});
assert from_str(~"1e") ==
Err(Error {line: 1u, col: 3u, msg: @~"invalid number"});
assert from_str(~"1e+") ==
Err(Error {line: 1u, col: 4u, msg: @~"invalid number"});
assert from_str(~"3") == Ok(Number(3f));
assert from_str(~"3.1") == Ok(Number(3.1f));
assert from_str(~"-1.2") == Ok(Number(-1.2f));
assert from_str(~"0.4") == Ok(Number(0.4f));
assert from_str(~"0.4e5") == Ok(Number(0.4e5f));
assert from_str(~"0.4e+15") == Ok(Number(0.4e15f));
assert from_str(~"0.4e-01") == Ok(Number(0.4e-01f));
assert from_str(~" 3 ") == Ok(Number(3f));
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}
#[test]
fn test_read_str() {
assert from_str(~"\"") ==
Err(Error {line: 1u, col: 2u, msg: @~"EOF while parsing string"});
assert from_str(~"\"lol") ==
Err(Error {line: 1u, col: 5u, msg: @~"EOF while parsing string"});
assert from_str(~"\"\"") == Ok(String(~""));
assert from_str(~"\"foo\"") == Ok(String(~"foo"));
assert from_str(~"\"\\\"\"") == Ok(String(~"\""));
assert from_str(~"\"\\b\"") == Ok(String(~"\x08"));
assert from_str(~"\"\\n\"") == Ok(String(~"\n"));
assert from_str(~"\"\\r\"") == Ok(String(~"\r"));
assert from_str(~"\"\\t\"") == Ok(String(~"\t"));
assert from_str(~" \"foo\" ") == Ok(String(~"foo"));
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}
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#[test]
fn test_unicode_hex_escapes_in_str() {
assert from_str(~"\"\\u12ab\"") == Ok(String(~"\u12ab"));
assert from_str(~"\"\\uAB12\"") == Ok(String(~"\uAB12"));
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}
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#[test]
fn test_read_list() {
assert from_str(~"[") ==
Err(Error {line: 1u, col: 2u, msg: @~"EOF while parsing value"});
assert from_str(~"[1") ==
Err(Error {line: 1u, col: 3u, msg: @~"EOF while parsing list"});
assert from_str(~"[1,") ==
Err(Error {line: 1u, col: 4u, msg: @~"EOF while parsing value"});
assert from_str(~"[1,]") ==
Err(Error {line: 1u, col: 4u, msg: @~"invalid syntax"});
assert from_str(~"[6 7]") ==
Err(Error {line: 1u, col: 4u, msg: @~"expected `,` or `]`"});
assert from_str(~"[]") == Ok(List(~[]));
assert from_str(~"[ ]") == Ok(List(~[]));
assert from_str(~"[true]") == Ok(List(~[Boolean(true)]));
assert from_str(~"[ false ]") == Ok(List(~[Boolean(false)]));
assert from_str(~"[null]") == Ok(List(~[Null]));
assert from_str(~"[3, 1]") == Ok(List(~[Number(3f), Number(1f)]));
assert from_str(~"\n[3, 2]\n") == Ok(List(~[Number(3f), Number(2f)]));
assert from_str(~"[2, [4, 1]]") ==
Ok(List(~[Number(2f), List(~[Number(4f), Number(1f)])]));
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}
#[test]
fn test_read_object() {
assert from_str(~"{") ==
Err(Error {line: 1u, col: 2u, msg: @~"EOF while parsing object"});
assert from_str(~"{ ") ==
Err(Error {line: 1u, col: 3u, msg: @~"EOF while parsing object"});
assert from_str(~"{1") ==
Err(Error {line: 1u, col: 2u, msg: @~"key must be a string"});
assert from_str(~"{ \"a\"") ==
Err(Error {line: 1u, col: 6u, msg: @~"EOF while parsing object"});
assert from_str(~"{\"a\"") ==
Err(Error {line: 1u, col: 5u, msg: @~"EOF while parsing object"});
assert from_str(~"{\"a\" ") ==
Err(Error {line: 1u, col: 6u, msg: @~"EOF while parsing object"});
assert from_str(~"{\"a\" 1") ==
Err(Error {line: 1u, col: 6u, msg: @~"expected `:`"});
assert from_str(~"{\"a\":") ==
Err(Error {line: 1u, col: 6u, msg: @~"EOF while parsing value"});
assert from_str(~"{\"a\":1") ==
Err(Error {line: 1u, col: 7u, msg: @~"EOF while parsing object"});
assert from_str(~"{\"a\":1 1") ==
Err(Error {line: 1u, col: 8u, msg: @~"expected `,` or `}`"});
assert from_str(~"{\"a\":1,") ==
Err(Error {line: 1u, col: 8u, msg: @~"EOF while parsing object"});
assert result::unwrap(from_str(~"{}")) == mk_object(~[]);
assert result::unwrap(from_str(~"{\"a\": 3}")) ==
mk_object(~[(~"a", Number(3.0f))]);
assert result::unwrap(from_str(~"{ \"a\": null, \"b\" : true }")) ==
mk_object(~[
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(~"a", Null),
(~"b", Boolean(true))]);
assert result::unwrap(
from_str(~"\n{ \"a\": null, \"b\" : true }\n")) ==
mk_object(~[
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(~"a", Null),
(~"b", Boolean(true))]);
assert result::unwrap(from_str(~"{\"a\" : 1.0 ,\"b\": [ true ]}")) ==
mk_object(~[
(~"a", Number(1.0)),
(~"b", List(~[Boolean(true)]))
]);
assert result::unwrap(from_str(
~"{" +
~"\"a\": 1.0, " +
~"\"b\": [" +
~"true," +
~"\"foo\\nbar\", " +
~"{ \"c\": {\"d\": null} } " +
~"]" +
~"}")) ==
mk_object(~[
(~"a", Number(1.0f)),
(~"b", List(~[
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Boolean(true),
String(~"foo\nbar"),
mk_object(~[
(~"c", mk_object(~[(~"d", Null)]))
])
]))
]);
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}
#[test]
fn test_multiline_errors() {
assert from_str(~"{\n \"foo\":\n \"bar\"") ==
Err(Error {line: 3u, col: 8u, msg: @~"EOF while parsing object"});
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}
}