882 lines
24 KiB
Rust
882 lines
24 KiB
Rust
// Rust JSON serialization library
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// Copyright (c) 2011 Google Inc.
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#[doc = "json serialization"];
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import result::{result, ok, err};
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import io;
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import io::{reader_util, writer_util};
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import map;
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import map::hashmap;
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export json;
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export error;
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export to_writer;
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export to_str;
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export from_reader;
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export from_str;
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export eq;
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export to_json;
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export num;
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export string;
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export boolean;
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export list;
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export dict;
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export null;
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#[doc = "Represents a json value"]
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enum json {
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num(float),
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string(@str),
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boolean(bool),
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list(@[json]/~),
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dict(map::hashmap<str, json>),
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null,
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}
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type error = {
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line: uint,
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col: uint,
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msg: @str,
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};
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#[doc = "Serializes a json value into a io::writer"]
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fn to_writer(wr: io::writer, j: json) {
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alt j {
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num(n) { wr.write_str(float::to_str(n, 6u)); }
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string(s) {
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wr.write_str(escape_str(*s));
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}
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boolean(b) {
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wr.write_str(if b { "true" } else { "false" });
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}
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list(v) {
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wr.write_char('[');
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let mut first = true;
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for (*v).each { |item|
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if !first {
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wr.write_str(", ");
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}
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first = false;
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to_writer(wr, item);
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};
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wr.write_char(']');
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}
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dict(d) {
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if d.size() == 0u {
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wr.write_str("{}");
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ret;
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}
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wr.write_str("{ ");
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let mut first = true;
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for d.each { |key, value|
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if !first {
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wr.write_str(", ");
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}
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first = false;
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wr.write_str(escape_str(key));
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wr.write_str(": ");
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to_writer(wr, value);
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};
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wr.write_str(" }");
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}
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null {
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wr.write_str("null");
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}
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}
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}
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fn escape_str(s: str) -> str {
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let mut escaped = "\"";
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str::chars_iter(s) { |c|
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alt c {
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'"' { escaped += "\\\""; }
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'\\' { escaped += "\\\\"; }
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'\x08' { escaped += "\\b"; }
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'\x0c' { escaped += "\\f"; }
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'\n' { escaped += "\\n"; }
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'\r' { escaped += "\\r"; }
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'\t' { escaped += "\\t"; }
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_ { escaped += str::from_char(c); }
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}
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};
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escaped += "\"";
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escaped
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}
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#[doc = "Serializes a json value into a string"]
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fn to_str(j: json) -> str {
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io::with_str_writer { |wr| to_writer(wr, j) }
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}
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type parser = {
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rdr: io::reader,
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mut ch: char,
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mut line: uint,
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mut col: uint,
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};
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impl parser for parser {
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fn eof() -> bool { self.ch == -1 as char }
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fn bump() {
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self.ch = self.rdr.read_char();
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if self.ch == '\n' {
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self.line += 1u;
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self.col = 1u;
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} else {
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self.col += 1u;
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}
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}
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fn next_char() -> char {
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self.bump();
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self.ch
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}
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fn error<T>(+msg: str) -> result<T, error> {
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err({ line: self.line, col: self.col, msg: @msg })
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}
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fn parse() -> result<json, error> {
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alt self.parse_value() {
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ok(value) {
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// Skip trailing whitespaces.
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self.parse_whitespace();
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// Make sure there is no trailing characters.
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if self.eof() {
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ok(value)
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} else {
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self.error("trailing characters")
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}
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}
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e { e }
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}
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}
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fn parse_value() -> result<json, error> {
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self.parse_whitespace();
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if self.eof() { ret self.error("EOF while parsing value"); }
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alt self.ch {
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'n' { self.parse_ident("ull", null) }
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't' { self.parse_ident("rue", boolean(true)) }
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'f' { self.parse_ident("alse", boolean(false)) }
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'0' to '9' | '-' { self.parse_number() }
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'"' {
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alt self.parse_str() {
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ok(s) { ok(string(s)) }
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err(e) { err(e) }
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}
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}
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'[' { self.parse_list() }
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'{' { self.parse_object() }
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_ { self.error("invalid syntax") }
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}
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}
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fn parse_whitespace() {
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while char::is_whitespace(self.ch) { self.bump(); }
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}
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fn parse_ident(ident: str, value: json) -> result<json, error> {
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if str::all(ident, { |c| c == self.next_char() }) {
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self.bump();
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ok(value)
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} else {
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self.error("invalid syntax")
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}
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}
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fn parse_number() -> result<json, error> {
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let mut neg = 1f;
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if self.ch == '-' {
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self.bump();
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neg = -1f;
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}
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let mut res = alt self.parse_integer() {
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ok(res) { res }
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err(e) { ret err(e); }
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};
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if self.ch == '.' {
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alt self.parse_decimal(res) {
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ok(r) { res = r; }
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err(e) { ret err(e); }
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}
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}
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if self.ch == 'e' || self.ch == 'E' {
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alt self.parse_exponent(res) {
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ok(r) { res = r; }
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err(e) { ret err(e); }
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}
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}
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ok(num(neg * res))
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}
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fn parse_integer() -> result<float, error> {
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let mut res = 0f;
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alt self.ch {
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'0' {
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self.bump();
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// There can be only one leading '0'.
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alt self.ch {
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'0' to '9' { ret self.error("invalid number"); }
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_ {}
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}
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}
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'1' to '9' {
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while !self.eof() {
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alt self.ch {
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'0' to '9' {
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res *= 10f;
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res += ((self.ch as int) - ('0' as int)) as float;
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self.bump();
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}
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_ { break; }
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}
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}
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}
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_ { ret self.error("invalid number"); }
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}
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ok(res)
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}
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fn parse_decimal(res: float) -> result<float, error> {
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self.bump();
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// Make sure a digit follows the decimal place.
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alt self.ch {
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'0' to '9' {}
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_ { ret self.error("invalid number"); }
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}
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let mut res = res;
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let mut dec = 1f;
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while !self.eof() {
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alt self.ch {
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'0' to '9' {
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dec /= 10f;
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res += (((self.ch as int) - ('0' as int)) as float) * dec;
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self.bump();
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}
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_ { break; }
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}
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}
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ok(res)
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}
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fn parse_exponent(res: float) -> result<float, error> {
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self.bump();
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let mut res = res;
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let mut exp = 0u;
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let mut neg_exp = false;
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alt self.ch {
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'+' { self.bump(); }
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'-' { self.bump(); neg_exp = true; }
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_ {}
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}
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// Make sure a digit follows the exponent place.
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alt self.ch {
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'0' to '9' {}
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_ { ret self.error("invalid number"); }
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}
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while !self.eof() {
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alt self.ch {
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'0' to '9' {
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exp *= 10u;
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exp += (self.ch as uint) - ('0' as uint);
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self.bump();
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}
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_ { break; }
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}
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}
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let exp = float::pow_with_uint(10u, exp);
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if neg_exp {
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res /= exp;
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} else {
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res *= exp;
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}
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ok(res)
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}
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fn parse_str() -> result<@str, error> {
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let mut escape = false;
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let mut res = "";
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while !self.eof() {
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self.bump();
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if (escape) {
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alt self.ch {
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'"' { str::push_char(res, '"'); }
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'\\' { str::push_char(res, '\\'); }
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'/' { str::push_char(res, '/'); }
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'b' { str::push_char(res, '\x08'); }
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'f' { str::push_char(res, '\x0c'); }
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'n' { str::push_char(res, '\n'); }
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'r' { str::push_char(res, '\r'); }
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't' { str::push_char(res, '\t'); }
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'u' {
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// Parse \u1234.
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let mut i = 0u;
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let mut n = 0u;
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while i < 4u {
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alt self.next_char() {
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'0' to '9' {
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n = n * 10u +
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(self.ch as uint) - ('0' as uint);
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}
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_ { ret self.error("invalid \\u escape"); }
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}
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i += 1u;
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}
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// Error out if we didn't parse 4 digits.
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if i != 4u {
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ret self.error("invalid \\u escape");
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}
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str::push_char(res, n as char);
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}
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_ { ret self.error("invalid escape"); }
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}
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escape = false;
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} else if self.ch == '\\' {
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escape = true;
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} else {
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if self.ch == '"' {
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self.bump();
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ret ok(@res);
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}
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str::push_char(res, self.ch);
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}
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}
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self.error("EOF while parsing string")
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}
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fn parse_list() -> result<json, error> {
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self.bump();
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self.parse_whitespace();
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let mut values = []/~;
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if self.ch == ']' {
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self.bump();
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ret ok(list(@values));
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}
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loop {
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alt self.parse_value() {
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ok(v) { vec::push(values, v); }
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e { ret e; }
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}
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self.parse_whitespace();
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if self.eof() {
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ret self.error("EOF while parsing list");
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}
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alt self.ch {
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',' { self.bump(); }
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']' { self.bump(); ret ok(list(@values)); }
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_ { ret self.error("expecting ',' or ']'"); }
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}
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};
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}
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fn parse_object() -> result<json, error> {
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self.bump();
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self.parse_whitespace();
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let values = map::str_hash();
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if self.ch == '}' {
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self.bump();
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ret ok(dict(values));
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}
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while !self.eof() {
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self.parse_whitespace();
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if self.ch != '"' {
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ret self.error("key must be a string");
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}
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let key = alt self.parse_str() {
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ok(key) { key }
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err(e) { ret err(e); }
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};
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self.parse_whitespace();
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if self.ch != ':' {
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if self.eof() { break; }
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ret self.error("expecting ':'");
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}
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self.bump();
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alt self.parse_value() {
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ok(value) { values.insert(copy *key, value); }
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e { ret e; }
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}
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self.parse_whitespace();
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alt self.ch {
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',' { self.bump(); }
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'}' { self.bump(); ret ok(dict(values)); }
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_ {
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if self.eof() { break; }
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ret self.error("expecting ',' or '}'");
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}
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}
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}
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ret self.error("EOF while parsing object");
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}
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}
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#[doc = "Deserializes a json value from an io::reader"]
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fn from_reader(rdr: io::reader) -> result<json, error> {
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let parser = {
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rdr: rdr,
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mut ch: rdr.read_char(),
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mut line: 1u,
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mut col: 1u,
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};
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parser.parse()
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}
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#[doc = "Deserializes a json value from a string"]
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fn from_str(s: str) -> result<json, error> {
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io::with_str_reader(s, from_reader)
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}
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#[doc = "Test if two json values are equal"]
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fn eq(value0: json, value1: json) -> bool {
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alt (value0, value1) {
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(num(f0), num(f1)) { f0 == f1 }
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(string(s0), string(s1)) { s0 == s1 }
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(boolean(b0), boolean(b1)) { b0 == b1 }
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(list(l0), list(l1)) { vec::all2(*l0, *l1, eq) }
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(dict(d0), dict(d1)) {
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if d0.size() == d1.size() {
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let mut equal = true;
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for d0.each { |k, v0|
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alt d1.find(k) {
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some(v1) {
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if !eq(v0, v1) { equal = false; } }
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none { equal = false; }
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}
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};
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equal
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} else {
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false
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}
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}
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(null, null) { true }
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_ { false }
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}
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}
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iface to_json { fn to_json() -> json; }
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impl of to_json for json {
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fn to_json() -> json { self }
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}
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impl of to_json for @json {
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fn to_json() -> json { *self }
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}
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impl of to_json for int {
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fn to_json() -> json { num(self as float) }
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}
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impl of to_json for i8 {
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fn to_json() -> json { num(self as float) }
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}
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impl of to_json for i16 {
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fn to_json() -> json { num(self as float) }
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}
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impl of to_json for i32 {
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fn to_json() -> json { num(self as float) }
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}
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impl of to_json for i64 {
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fn to_json() -> json { num(self as float) }
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}
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impl of to_json for uint {
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fn to_json() -> json { num(self as float) }
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}
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impl of to_json for u8 {
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fn to_json() -> json { num(self as float) }
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}
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impl of to_json for u16 {
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fn to_json() -> json { num(self as float) }
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}
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impl of to_json for u32 {
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fn to_json() -> json { num(self as float) }
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}
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impl of to_json for u64 {
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fn to_json() -> json { num(self as float) }
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}
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impl of to_json for float {
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fn to_json() -> json { num(self) }
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}
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impl of to_json for f32 {
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fn to_json() -> json { num(self as float) }
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}
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impl of to_json for f64 {
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fn to_json() -> json { num(self as float) }
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}
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impl of to_json for () {
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fn to_json() -> json { null }
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}
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impl of to_json for bool {
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fn to_json() -> json { boolean(self) }
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}
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impl of to_json for str {
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fn to_json() -> json { string(@copy self) }
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}
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impl of to_json for @str {
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fn to_json() -> json { string(self) }
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}
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impl <A: to_json copy, B: to_json copy> of to_json for (A, B) {
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fn to_json() -> json {
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let (a, b) = self;
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list(@[a.to_json(), b.to_json()]/~)
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}
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}
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impl <A: to_json copy, B: to_json copy, C: to_json copy>
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of to_json for (A, B, C) {
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fn to_json() -> json {
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let (a, b, c) = self;
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list(@[a.to_json(), b.to_json(), c.to_json()]/~)
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}
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}
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impl <A: to_json> of to_json for [A]/~ {
|
|
fn to_json() -> json { list(@self.map { |elt| elt.to_json() }) }
|
|
}
|
|
|
|
impl <A: to_json copy> of to_json for hashmap<str, A> {
|
|
fn to_json() -> json {
|
|
let d = map::str_hash();
|
|
for self.each() { |key, value|
|
|
d.insert(copy key, value.to_json());
|
|
}
|
|
dict(d)
|
|
}
|
|
}
|
|
|
|
impl <A: to_json> of to_json for option<A> {
|
|
fn to_json() -> json {
|
|
alt self {
|
|
none { null }
|
|
some(value) { value.to_json() }
|
|
}
|
|
}
|
|
}
|
|
|
|
impl of to_str::to_str for json {
|
|
fn to_str() -> str { to_str(self) }
|
|
}
|
|
|
|
impl of to_str::to_str for error {
|
|
fn to_str() -> str {
|
|
#fmt("%u:%u: %s", self.line, self.col, *self.msg)
|
|
}
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
fn mk_dict(items: [(str, json)]/~) -> json {
|
|
let d = map::str_hash();
|
|
|
|
vec::iter(items) { |item|
|
|
let (key, value) = copy item;
|
|
d.insert(key, value);
|
|
};
|
|
|
|
dict(d)
|
|
}
|
|
|
|
#[test]
|
|
fn test_write_null() {
|
|
assert to_str(null) == "null";
|
|
}
|
|
|
|
#[test]
|
|
fn test_write_num() {
|
|
assert to_str(num(3f)) == "3";
|
|
assert to_str(num(3.1f)) == "3.1";
|
|
assert to_str(num(-1.5f)) == "-1.5";
|
|
assert to_str(num(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(@[
|
|
boolean(false),
|
|
null,
|
|
list(@[string(@"foo\nbar"), num(3.5f)]/~)
|
|
]/~)) == "[false, null, [\"foo\\nbar\", 3.5]]";
|
|
}
|
|
|
|
#[test]
|
|
fn test_write_dict() {
|
|
assert to_str(mk_dict([]/~)) == "{}";
|
|
assert to_str(mk_dict([("a", boolean(true))]/~)) == "{ \"a\": true }";
|
|
assert to_str(mk_dict([
|
|
("a", boolean(true)),
|
|
("b", list(@[
|
|
mk_dict([("c", string(@"\x0c\r"))]/~),
|
|
mk_dict([("d", string(@""))]/~)
|
|
]/~))
|
|
]/~)) ==
|
|
"{ " +
|
|
"\"a\": true, " +
|
|
"\"b\": [" +
|
|
"{ \"c\": \"\\f\\r\" }, " +
|
|
"{ \"d\": \"\" }" +
|
|
"]" +
|
|
" }";
|
|
}
|
|
|
|
#[test]
|
|
fn test_trailing_characters() {
|
|
assert from_str("nulla") ==
|
|
err({line: 1u, col: 5u, msg: @"trailing characters"});
|
|
assert from_str("truea") ==
|
|
err({line: 1u, col: 5u, msg: @"trailing characters"});
|
|
assert from_str("falsea") ==
|
|
err({line: 1u, col: 6u, msg: @"trailing characters"});
|
|
assert from_str("1a") ==
|
|
err({line: 1u, col: 2u, msg: @"trailing characters"});
|
|
assert from_str("[]/~a") ==
|
|
err({line: 1u, col: 3u, msg: @"trailing characters"});
|
|
assert from_str("{}a") ==
|
|
err({line: 1u, col: 3u, msg: @"trailing characters"});
|
|
}
|
|
|
|
#[test]
|
|
fn test_read_identifiers() {
|
|
assert from_str("n") ==
|
|
err({line: 1u, col: 2u, msg: @"invalid syntax"});
|
|
assert from_str("nul") ==
|
|
err({line: 1u, col: 4u, msg: @"invalid syntax"});
|
|
|
|
assert from_str("t") ==
|
|
err({line: 1u, col: 2u, msg: @"invalid syntax"});
|
|
assert from_str("truz") ==
|
|
err({line: 1u, col: 4u, msg: @"invalid syntax"});
|
|
|
|
assert from_str("f") ==
|
|
err({line: 1u, col: 2u, msg: @"invalid syntax"});
|
|
assert from_str("faz") ==
|
|
err({line: 1u, col: 3u, msg: @"invalid syntax"});
|
|
|
|
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));
|
|
}
|
|
|
|
#[test]
|
|
fn test_read_num() {
|
|
assert from_str("+") ==
|
|
err({line: 1u, col: 1u, msg: @"invalid syntax"});
|
|
assert from_str(".") ==
|
|
err({line: 1u, col: 1u, msg: @"invalid syntax"});
|
|
|
|
assert from_str("-") ==
|
|
err({line: 1u, col: 2u, msg: @"invalid number"});
|
|
assert from_str("00") ==
|
|
err({line: 1u, col: 2u, msg: @"invalid number"});
|
|
assert from_str("1.") ==
|
|
err({line: 1u, col: 3u, msg: @"invalid number"});
|
|
assert from_str("1e") ==
|
|
err({line: 1u, col: 3u, msg: @"invalid number"});
|
|
assert from_str("1e+") ==
|
|
err({line: 1u, col: 4u, msg: @"invalid number"});
|
|
|
|
assert from_str("3") == ok(num(3f));
|
|
assert from_str("3.1") == ok(num(3.1f));
|
|
assert from_str("-1.2") == ok(num(-1.2f));
|
|
assert from_str("0.4") == ok(num(0.4f));
|
|
assert from_str("0.4e5") == ok(num(0.4e5f));
|
|
assert from_str("0.4e+15") == ok(num(0.4e15f));
|
|
assert from_str("0.4e-01") == ok(num(0.4e-01f));
|
|
assert from_str(" 3 ") == ok(num(3f));
|
|
}
|
|
|
|
#[test]
|
|
fn test_read_str() {
|
|
assert from_str("\"") ==
|
|
err({line: 1u, col: 2u, msg: @"EOF while parsing string"});
|
|
assert from_str("\"lol") ==
|
|
err({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"));
|
|
}
|
|
|
|
#[test]
|
|
fn test_read_list() {
|
|
assert from_str("[") ==
|
|
err({line: 1u, col: 2u, msg: @"EOF while parsing value"});
|
|
assert from_str("[1") ==
|
|
err({line: 1u, col: 3u, msg: @"EOF while parsing list"});
|
|
assert from_str("[1,") ==
|
|
err({line: 1u, col: 4u, msg: @"EOF while parsing value"});
|
|
assert from_str("[1,]") ==
|
|
err({line: 1u, col: 4u, msg: @"invalid syntax"});
|
|
assert from_str("[6 7]") ==
|
|
err({line: 1u, col: 4u, msg: @"expecting ',' 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(@[num(3f), num(1f)]/~));
|
|
assert from_str("\n[3, 2]\n") == ok(list(@[num(3f), num(2f)]/~));
|
|
assert from_str("[2, [4, 1]]") ==
|
|
ok(list(@[num(2f), list(@[num(4f), num(1f)]/~)]/~));
|
|
}
|
|
|
|
#[test]
|
|
fn test_read_dict() {
|
|
assert from_str("{") ==
|
|
err({line: 1u, col: 2u, msg: @"EOF while parsing object"});
|
|
assert from_str("{ ") ==
|
|
err({line: 1u, col: 3u, msg: @"EOF while parsing object"});
|
|
assert from_str("{1") ==
|
|
err({line: 1u, col: 2u, msg: @"key must be a string"});
|
|
assert from_str("{ \"a\"") ==
|
|
err({line: 1u, col: 6u, msg: @"EOF while parsing object"});
|
|
assert from_str("{\"a\"") ==
|
|
err({line: 1u, col: 5u, msg: @"EOF while parsing object"});
|
|
assert from_str("{\"a\" ") ==
|
|
err({line: 1u, col: 6u, msg: @"EOF while parsing object"});
|
|
|
|
assert from_str("{\"a\" 1") ==
|
|
err({line: 1u, col: 6u, msg: @"expecting ':'"});
|
|
assert from_str("{\"a\":") ==
|
|
err({line: 1u, col: 6u, msg: @"EOF while parsing value"});
|
|
assert from_str("{\"a\":1") ==
|
|
err({line: 1u, col: 7u, msg: @"EOF while parsing object"});
|
|
assert from_str("{\"a\":1 1") ==
|
|
err({line: 1u, col: 8u, msg: @"expecting ',' or '}'"});
|
|
assert from_str("{\"a\":1,") ==
|
|
err({line: 1u, col: 8u, msg: @"EOF while parsing object"});
|
|
|
|
assert eq(result::get(from_str("{}")), mk_dict([]/~));
|
|
assert eq(result::get(from_str("{\"a\": 3}")),
|
|
mk_dict([("a", num(3.0f))]/~));
|
|
|
|
assert eq(result::get(from_str("{ \"a\": null, \"b\" : true }")),
|
|
mk_dict([
|
|
("a", null),
|
|
("b", boolean(true))]/~));
|
|
assert eq(result::get(from_str("\n{ \"a\": null, \"b\" : true }\n")),
|
|
mk_dict([
|
|
("a", null),
|
|
("b", boolean(true))]/~));
|
|
assert eq(result::get(from_str("{\"a\" : 1.0 ,\"b\": [ true ]}")),
|
|
mk_dict([
|
|
("a", num(1.0)),
|
|
("b", list(@[boolean(true)]/~))
|
|
]/~));
|
|
assert eq(result::get(from_str(
|
|
"{" +
|
|
"\"a\": 1.0, " +
|
|
"\"b\": [" +
|
|
"true," +
|
|
"\"foo\\nbar\", " +
|
|
"{ \"c\": {\"d\": null} } " +
|
|
"]" +
|
|
"}")),
|
|
mk_dict([
|
|
("a", num(1.0f)),
|
|
("b", list(@[
|
|
boolean(true),
|
|
string(@"foo\nbar"),
|
|
mk_dict([
|
|
("c", mk_dict([("d", null)]/~))
|
|
]/~)
|
|
]/~))
|
|
]/~));
|
|
}
|
|
|
|
#[test]
|
|
fn test_multiline_errors() {
|
|
assert from_str("{\n \"foo\":\n \"bar\"") ==
|
|
err({line: 3u, col: 8u, msg: @"EOF while parsing object"});
|
|
}
|
|
}
|