771 lines
24 KiB
JavaScript
771 lines
24 KiB
JavaScript
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// json5.js
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// Modern JSON. See README.md for details.
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//
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// This file is based directly off of Douglas Crockford's json_parse.js:
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// https://github.com/douglascrockford/JSON-js/blob/master/json_parse.js
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var JSON5 = (typeof exports === 'object' ? exports : {});
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JSON5.parse = (function () {
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"use strict";
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// This is a function that can parse a JSON5 text, producing a JavaScript
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// data structure. It is a simple, recursive descent parser. It does not use
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// eval or regular expressions, so it can be used as a model for implementing
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// a JSON5 parser in other languages.
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// We are defining the function inside of another function to avoid creating
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// global variables.
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var at, // The index of the current character
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lineNumber, // The current line number
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columnNumber, // The current column number
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ch, // The current character
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escapee = {
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"'": "'",
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'"': '"',
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'\\': '\\',
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'/': '/',
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'\n': '', // Replace escaped newlines in strings w/ empty string
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b: '\b',
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f: '\f',
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n: '\n',
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r: '\r',
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t: '\t'
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},
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ws = [
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' ',
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'\t',
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'\r',
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'\n',
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'\v',
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'\f',
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'\xA0',
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'\uFEFF'
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],
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text,
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renderChar = function (chr) {
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return chr === '' ? 'EOF' : "'" + chr + "'";
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},
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error = function (m) {
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// Call error when something is wrong.
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var error = new SyntaxError();
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// beginning of message suffix to agree with that provided by Gecko - see https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/JSON/parse
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error.message = m + " at line " + lineNumber + " column " + columnNumber + " of the JSON5 data. Still to read: " + JSON.stringify(text.substring(at - 1, at + 19));
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error.at = at;
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// These two property names have been chosen to agree with the ones in Gecko, the only popular
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// environment which seems to supply this info on JSON.parse
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error.lineNumber = lineNumber;
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error.columnNumber = columnNumber;
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throw error;
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},
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next = function (c) {
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// If a c parameter is provided, verify that it matches the current character.
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if (c && c !== ch) {
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error("Expected " + renderChar(c) + " instead of " + renderChar(ch));
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}
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// Get the next character. When there are no more characters,
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// return the empty string.
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ch = text.charAt(at);
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at++;
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columnNumber++;
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if (ch === '\n' || ch === '\r' && peek() !== '\n') {
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lineNumber++;
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columnNumber = 0;
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}
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return ch;
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},
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peek = function () {
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// Get the next character without consuming it or
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// assigning it to the ch varaible.
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return text.charAt(at);
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},
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identifier = function () {
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// Parse an identifier. Normally, reserved words are disallowed here, but we
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// only use this for unquoted object keys, where reserved words are allowed,
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// so we don't check for those here. References:
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// - http://es5.github.com/#x7.6
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// - https://developer.mozilla.org/en/Core_JavaScript_1.5_Guide/Core_Language_Features#Variables
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// - http://docstore.mik.ua/orelly/webprog/jscript/ch02_07.htm
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// TODO Identifiers can have Unicode "letters" in them; add support for those.
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var key = ch;
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// Identifiers must start with a letter, _ or $.
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if ((ch !== '_' && ch !== '$') &&
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(ch < 'a' || ch > 'z') &&
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(ch < 'A' || ch > 'Z')) {
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error("Bad identifier as unquoted key");
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}
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// Subsequent characters can contain digits.
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while (next() && (
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ch === '_' || ch === '$' ||
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(ch >= 'a' && ch <= 'z') ||
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(ch >= 'A' && ch <= 'Z') ||
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(ch >= '0' && ch <= '9'))) {
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key += ch;
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}
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return key;
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},
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number = function () {
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// Parse a number value.
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var number,
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sign = '',
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string = '',
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base = 10;
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if (ch === '-' || ch === '+') {
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sign = ch;
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next(ch);
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}
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// support for Infinity (could tweak to allow other words):
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if (ch === 'I') {
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number = word();
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if (typeof number !== 'number' || isNaN(number)) {
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error('Unexpected word for number');
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}
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return (sign === '-') ? -number : number;
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}
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// support for NaN
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if (ch === 'N' ) {
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number = word();
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if (!isNaN(number)) {
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error('expected word to be NaN');
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}
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// ignore sign as -NaN also is NaN
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return number;
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}
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if (ch === '0') {
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string += ch;
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next();
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if (ch === 'x' || ch === 'X') {
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string += ch;
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next();
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base = 16;
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} else if (ch >= '0' && ch <= '9') {
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error('Octal literal');
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}
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}
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switch (base) {
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case 10:
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while (ch >= '0' && ch <= '9' ) {
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string += ch;
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next();
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}
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if (ch === '.') {
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string += '.';
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while (next() && ch >= '0' && ch <= '9') {
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string += ch;
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}
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}
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if (ch === 'e' || ch === 'E') {
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string += ch;
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next();
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if (ch === '-' || ch === '+') {
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string += ch;
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next();
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}
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while (ch >= '0' && ch <= '9') {
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string += ch;
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next();
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}
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}
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break;
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case 16:
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while (ch >= '0' && ch <= '9' || ch >= 'A' && ch <= 'F' || ch >= 'a' && ch <= 'f') {
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string += ch;
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next();
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}
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break;
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}
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if(sign === '-') {
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number = -string;
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} else {
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number = +string;
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}
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if (!isFinite(number)) {
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error("Bad number");
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} else {
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return number;
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}
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},
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string = function () {
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// Parse a string value.
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var hex,
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i,
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string = '',
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delim, // double quote or single quote
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uffff;
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// When parsing for string values, we must look for ' or " and \ characters.
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if (ch === '"' || ch === "'") {
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delim = ch;
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while (next()) {
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if (ch === delim) {
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next();
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return string;
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} else if (ch === '\\') {
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next();
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if (ch === 'u') {
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uffff = 0;
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for (i = 0; i < 4; i += 1) {
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hex = parseInt(next(), 16);
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if (!isFinite(hex)) {
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break;
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}
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uffff = uffff * 16 + hex;
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}
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string += String.fromCharCode(uffff);
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} else if (ch === '\r') {
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if (peek() === '\n') {
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next();
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}
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} else if (typeof escapee[ch] === 'string') {
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string += escapee[ch];
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} else {
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break;
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}
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} else if (ch === '\n') {
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// unescaped newlines are invalid; see:
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// https://github.com/aseemk/json5/issues/24
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// TODO this feels special-cased; are there other
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// invalid unescaped chars?
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break;
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} else {
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string += ch;
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}
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}
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}
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error("Bad string");
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},
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inlineComment = function () {
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// Skip an inline comment, assuming this is one. The current character should
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// be the second / character in the // pair that begins this inline comment.
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// To finish the inline comment, we look for a newline or the end of the text.
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if (ch !== '/') {
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error("Not an inline comment");
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}
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do {
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next();
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if (ch === '\n' || ch === '\r') {
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next();
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return;
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}
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} while (ch);
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},
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blockComment = function () {
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// Skip a block comment, assuming this is one. The current character should be
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// the * character in the /* pair that begins this block comment.
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// To finish the block comment, we look for an ending */ pair of characters,
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// but we also watch for the end of text before the comment is terminated.
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if (ch !== '*') {
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error("Not a block comment");
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}
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do {
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next();
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while (ch === '*') {
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next('*');
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if (ch === '/') {
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next('/');
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return;
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}
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}
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} while (ch);
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error("Unterminated block comment");
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},
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comment = function () {
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// Skip a comment, whether inline or block-level, assuming this is one.
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// Comments always begin with a / character.
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if (ch !== '/') {
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error("Not a comment");
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}
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next('/');
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if (ch === '/') {
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inlineComment();
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} else if (ch === '*') {
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blockComment();
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} else {
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error("Unrecognized comment");
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}
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},
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white = function () {
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// Skip whitespace and comments.
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// Note that we're detecting comments by only a single / character.
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// This works since regular expressions are not valid JSON(5), but this will
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// break if there are other valid values that begin with a / character!
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while (ch) {
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if (ch === '/') {
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comment();
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} else if (ws.indexOf(ch) >= 0) {
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next();
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} else {
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return;
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}
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}
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},
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word = function () {
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// true, false, or null.
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switch (ch) {
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case 't':
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next('t');
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next('r');
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next('u');
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next('e');
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return true;
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case 'f':
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next('f');
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next('a');
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next('l');
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next('s');
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next('e');
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return false;
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case 'n':
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next('n');
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next('u');
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next('l');
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next('l');
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return null;
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case 'I':
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next('I');
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next('n');
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next('f');
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next('i');
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next('n');
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next('i');
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next('t');
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next('y');
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return Infinity;
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case 'N':
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next( 'N' );
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next( 'a' );
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next( 'N' );
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return NaN;
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}
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error("Unexpected " + renderChar(ch));
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},
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value, // Place holder for the value function.
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array = function () {
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// Parse an array value.
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var array = [];
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if (ch === '[') {
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next('[');
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white();
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while (ch) {
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if (ch === ']') {
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next(']');
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return array; // Potentially empty array
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}
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// ES5 allows omitting elements in arrays, e.g. [,] and
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// [,null]. We don't allow this in JSON5.
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if (ch === ',') {
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error("Missing array element");
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} else {
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array.push(value());
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}
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white();
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// If there's no comma after this value, this needs to
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// be the end of the array.
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if (ch !== ',') {
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next(']');
|
||
|
|
return array;
|
||
|
|
}
|
||
|
|
next(',');
|
||
|
|
white();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
error("Bad array");
|
||
|
|
},
|
||
|
|
|
||
|
|
object = function () {
|
||
|
|
|
||
|
|
// Parse an object value.
|
||
|
|
|
||
|
|
var key,
|
||
|
|
object = {};
|
||
|
|
|
||
|
|
if (ch === '{') {
|
||
|
|
next('{');
|
||
|
|
white();
|
||
|
|
while (ch) {
|
||
|
|
if (ch === '}') {
|
||
|
|
next('}');
|
||
|
|
return object; // Potentially empty object
|
||
|
|
}
|
||
|
|
|
||
|
|
// Keys can be unquoted. If they are, they need to be
|
||
|
|
// valid JS identifiers.
|
||
|
|
if (ch === '"' || ch === "'") {
|
||
|
|
key = string();
|
||
|
|
} else {
|
||
|
|
key = identifier();
|
||
|
|
}
|
||
|
|
|
||
|
|
white();
|
||
|
|
next(':');
|
||
|
|
object[key] = value();
|
||
|
|
white();
|
||
|
|
// If there's no comma after this pair, this needs to be
|
||
|
|
// the end of the object.
|
||
|
|
if (ch !== ',') {
|
||
|
|
next('}');
|
||
|
|
return object;
|
||
|
|
}
|
||
|
|
next(',');
|
||
|
|
white();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
error("Bad object");
|
||
|
|
};
|
||
|
|
|
||
|
|
value = function () {
|
||
|
|
|
||
|
|
// Parse a JSON value. It could be an object, an array, a string, a number,
|
||
|
|
// or a word.
|
||
|
|
|
||
|
|
white();
|
||
|
|
switch (ch) {
|
||
|
|
case '{':
|
||
|
|
return object();
|
||
|
|
case '[':
|
||
|
|
return array();
|
||
|
|
case '"':
|
||
|
|
case "'":
|
||
|
|
return string();
|
||
|
|
case '-':
|
||
|
|
case '+':
|
||
|
|
case '.':
|
||
|
|
return number();
|
||
|
|
default:
|
||
|
|
return ch >= '0' && ch <= '9' ? number() : word();
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
// Return the json_parse function. It will have access to all of the above
|
||
|
|
// functions and variables.
|
||
|
|
|
||
|
|
return function (source, reviver) {
|
||
|
|
var result;
|
||
|
|
|
||
|
|
text = String(source);
|
||
|
|
at = 0;
|
||
|
|
lineNumber = 1;
|
||
|
|
columnNumber = 1;
|
||
|
|
ch = ' ';
|
||
|
|
result = value();
|
||
|
|
white();
|
||
|
|
if (ch) {
|
||
|
|
error("Syntax error");
|
||
|
|
}
|
||
|
|
|
||
|
|
// If there is a reviver function, we recursively walk the new structure,
|
||
|
|
// passing each name/value pair to the reviver function for possible
|
||
|
|
// transformation, starting with a temporary root object that holds the result
|
||
|
|
// in an empty key. If there is not a reviver function, we simply return the
|
||
|
|
// result.
|
||
|
|
|
||
|
|
return typeof reviver === 'function' ? (function walk(holder, key) {
|
||
|
|
var k, v, value = holder[key];
|
||
|
|
if (value && typeof value === 'object') {
|
||
|
|
for (k in value) {
|
||
|
|
if (Object.prototype.hasOwnProperty.call(value, k)) {
|
||
|
|
v = walk(value, k);
|
||
|
|
if (v !== undefined) {
|
||
|
|
value[k] = v;
|
||
|
|
} else {
|
||
|
|
delete value[k];
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return reviver.call(holder, key, value);
|
||
|
|
}({'': result}, '')) : result;
|
||
|
|
};
|
||
|
|
}());
|
||
|
|
|
||
|
|
// JSON5 stringify will not quote keys where appropriate
|
||
|
|
JSON5.stringify = function (obj, replacer, space) {
|
||
|
|
if (replacer && (typeof(replacer) !== "function" && !isArray(replacer))) {
|
||
|
|
throw new Error('Replacer must be a function or an array');
|
||
|
|
}
|
||
|
|
var getReplacedValueOrUndefined = function(holder, key, isTopLevel) {
|
||
|
|
var value = holder[key];
|
||
|
|
|
||
|
|
// Replace the value with its toJSON value first, if possible
|
||
|
|
if (value && value.toJSON && typeof value.toJSON === "function") {
|
||
|
|
value = value.toJSON();
|
||
|
|
}
|
||
|
|
|
||
|
|
// If the user-supplied replacer if a function, call it. If it's an array, check objects' string keys for
|
||
|
|
// presence in the array (removing the key/value pair from the resulting JSON if the key is missing).
|
||
|
|
if (typeof(replacer) === "function") {
|
||
|
|
return replacer.call(holder, key, value);
|
||
|
|
} else if(replacer) {
|
||
|
|
if (isTopLevel || isArray(holder) || replacer.indexOf(key) >= 0) {
|
||
|
|
return value;
|
||
|
|
} else {
|
||
|
|
return undefined;
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
return value;
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
function isWordChar(c) {
|
||
|
|
return (c >= 'a' && c <= 'z') ||
|
||
|
|
(c >= 'A' && c <= 'Z') ||
|
||
|
|
(c >= '0' && c <= '9') ||
|
||
|
|
c === '_' || c === '$';
|
||
|
|
}
|
||
|
|
|
||
|
|
function isWordStart(c) {
|
||
|
|
return (c >= 'a' && c <= 'z') ||
|
||
|
|
(c >= 'A' && c <= 'Z') ||
|
||
|
|
c === '_' || c === '$';
|
||
|
|
}
|
||
|
|
|
||
|
|
function isWord(key) {
|
||
|
|
if (typeof key !== 'string') {
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
if (!isWordStart(key[0])) {
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
var i = 1, length = key.length;
|
||
|
|
while (i < length) {
|
||
|
|
if (!isWordChar(key[i])) {
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
i++;
|
||
|
|
}
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
// export for use in tests
|
||
|
|
JSON5.isWord = isWord;
|
||
|
|
|
||
|
|
// polyfills
|
||
|
|
function isArray(obj) {
|
||
|
|
if (Array.isArray) {
|
||
|
|
return Array.isArray(obj);
|
||
|
|
} else {
|
||
|
|
return Object.prototype.toString.call(obj) === '[object Array]';
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
function isDate(obj) {
|
||
|
|
return Object.prototype.toString.call(obj) === '[object Date]';
|
||
|
|
}
|
||
|
|
|
||
|
|
var objStack = [];
|
||
|
|
function checkForCircular(obj) {
|
||
|
|
for (var i = 0; i < objStack.length; i++) {
|
||
|
|
if (objStack[i] === obj) {
|
||
|
|
throw new TypeError("Converting circular structure to JSON");
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
function makeIndent(str, num, noNewLine) {
|
||
|
|
if (!str) {
|
||
|
|
return "";
|
||
|
|
}
|
||
|
|
// indentation no more than 10 chars
|
||
|
|
if (str.length > 10) {
|
||
|
|
str = str.substring(0, 10);
|
||
|
|
}
|
||
|
|
|
||
|
|
var indent = noNewLine ? "" : "\n";
|
||
|
|
for (var i = 0; i < num; i++) {
|
||
|
|
indent += str;
|
||
|
|
}
|
||
|
|
|
||
|
|
return indent;
|
||
|
|
}
|
||
|
|
|
||
|
|
var indentStr;
|
||
|
|
if (space) {
|
||
|
|
if (typeof space === "string") {
|
||
|
|
indentStr = space;
|
||
|
|
} else if (typeof space === "number" && space >= 0) {
|
||
|
|
indentStr = makeIndent(" ", space, true);
|
||
|
|
} else {
|
||
|
|
// ignore space parameter
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// Copied from Crokford's implementation of JSON
|
||
|
|
// See https://github.com/douglascrockford/JSON-js/blob/e39db4b7e6249f04a195e7dd0840e610cc9e941e/json2.js#L195
|
||
|
|
// Begin
|
||
|
|
var cx = /[\u0000\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g,
|
||
|
|
escapable = /[\\\"\x00-\x1f\x7f-\x9f\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g,
|
||
|
|
meta = { // table of character substitutions
|
||
|
|
'\b': '\\b',
|
||
|
|
'\t': '\\t',
|
||
|
|
'\n': '\\n',
|
||
|
|
'\f': '\\f',
|
||
|
|
'\r': '\\r',
|
||
|
|
'"' : '\\"',
|
||
|
|
'\\': '\\\\'
|
||
|
|
};
|
||
|
|
function escapeString(string) {
|
||
|
|
|
||
|
|
// If the string contains no control characters, no quote characters, and no
|
||
|
|
// backslash characters, then we can safely slap some quotes around it.
|
||
|
|
// Otherwise we must also replace the offending characters with safe escape
|
||
|
|
// sequences.
|
||
|
|
escapable.lastIndex = 0;
|
||
|
|
return escapable.test(string) ? '"' + string.replace(escapable, function (a) {
|
||
|
|
var c = meta[a];
|
||
|
|
return typeof c === 'string' ?
|
||
|
|
c :
|
||
|
|
'\\u' + ('0000' + a.charCodeAt(0).toString(16)).slice(-4);
|
||
|
|
}) + '"' : '"' + string + '"';
|
||
|
|
}
|
||
|
|
// End
|
||
|
|
|
||
|
|
function internalStringify(holder, key, isTopLevel) {
|
||
|
|
var buffer, res;
|
||
|
|
|
||
|
|
// Replace the value, if necessary
|
||
|
|
var obj_part = getReplacedValueOrUndefined(holder, key, isTopLevel);
|
||
|
|
|
||
|
|
if (obj_part && !isDate(obj_part)) {
|
||
|
|
// unbox objects
|
||
|
|
// don't unbox dates, since will turn it into number
|
||
|
|
obj_part = obj_part.valueOf();
|
||
|
|
}
|
||
|
|
switch(typeof obj_part) {
|
||
|
|
case "boolean":
|
||
|
|
return obj_part.toString();
|
||
|
|
|
||
|
|
case "number":
|
||
|
|
if (isNaN(obj_part) || !isFinite(obj_part)) {
|
||
|
|
return "null";
|
||
|
|
}
|
||
|
|
return obj_part.toString();
|
||
|
|
|
||
|
|
case "string":
|
||
|
|
return escapeString(obj_part.toString());
|
||
|
|
|
||
|
|
case "object":
|
||
|
|
if (obj_part === null) {
|
||
|
|
return "null";
|
||
|
|
} else if (isArray(obj_part)) {
|
||
|
|
checkForCircular(obj_part);
|
||
|
|
buffer = "[";
|
||
|
|
objStack.push(obj_part);
|
||
|
|
|
||
|
|
for (var i = 0; i < obj_part.length; i++) {
|
||
|
|
res = internalStringify(obj_part, i, false);
|
||
|
|
buffer += makeIndent(indentStr, objStack.length);
|
||
|
|
if (res === null || typeof res === "undefined") {
|
||
|
|
buffer += "null";
|
||
|
|
} else {
|
||
|
|
buffer += res;
|
||
|
|
}
|
||
|
|
if (i < obj_part.length-1) {
|
||
|
|
buffer += ",";
|
||
|
|
} else if (indentStr) {
|
||
|
|
buffer += "\n";
|
||
|
|
}
|
||
|
|
}
|
||
|
|
objStack.pop();
|
||
|
|
if (obj_part.length) {
|
||
|
|
buffer += makeIndent(indentStr, objStack.length, true)
|
||
|
|
}
|
||
|
|
buffer += "]";
|
||
|
|
} else {
|
||
|
|
checkForCircular(obj_part);
|
||
|
|
buffer = "{";
|
||
|
|
var nonEmpty = false;
|
||
|
|
objStack.push(obj_part);
|
||
|
|
for (var prop in obj_part) {
|
||
|
|
if (obj_part.hasOwnProperty(prop)) {
|
||
|
|
var value = internalStringify(obj_part, prop, false);
|
||
|
|
isTopLevel = false;
|
||
|
|
if (typeof value !== "undefined" && value !== null) {
|
||
|
|
buffer += makeIndent(indentStr, objStack.length);
|
||
|
|
nonEmpty = true;
|
||
|
|
key = isWord(prop) ? prop : escapeString(prop);
|
||
|
|
buffer += key + ":" + (indentStr ? ' ' : '') + value + ",";
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
objStack.pop();
|
||
|
|
if (nonEmpty) {
|
||
|
|
buffer = buffer.substring(0, buffer.length-1) + makeIndent(indentStr, objStack.length) + "}";
|
||
|
|
} else {
|
||
|
|
buffer = '{}';
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return buffer;
|
||
|
|
default:
|
||
|
|
// functions and undefined should be ignored
|
||
|
|
return undefined;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// special case...when undefined is used inside of
|
||
|
|
// a compound object/array, return null.
|
||
|
|
// but when top-level, return undefined
|
||
|
|
var topLevelHolder = {"":obj};
|
||
|
|
if (obj === undefined) {
|
||
|
|
return getReplacedValueOrUndefined(topLevelHolder, '', true);
|
||
|
|
}
|
||
|
|
return internalStringify(topLevelHolder, '', true);
|
||
|
|
};
|