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authorGravatar Piotr Russ <mail@pruss.it> 2020-11-16 00:10:28 +0100
committerGravatar Piotr Russ <mail@pruss.it> 2020-11-16 00:10:28 +0100
commite06ec920f7a5d784e674c4c4b4e6d1da3dc7391d (patch)
tree55713f725f77b44ebfec86e4eec3ce33e71458ca /node_modules/json5/lib/json5.js
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+// json5.js
+// Modern JSON. See README.md for details.
+//
+// This file is based directly off of Douglas Crockford's json_parse.js:
+// https://github.com/douglascrockford/JSON-js/blob/master/json_parse.js
+
+var JSON5 = (typeof exports === 'object' ? exports : {});
+
+JSON5.parse = (function () {
+ "use strict";
+
+// This is a function that can parse a JSON5 text, producing a JavaScript
+// data structure. It is a simple, recursive descent parser. It does not use
+// eval or regular expressions, so it can be used as a model for implementing
+// a JSON5 parser in other languages.
+
+// We are defining the function inside of another function to avoid creating
+// global variables.
+
+ var at, // The index of the current character
+ lineNumber, // The current line number
+ columnNumber, // The current column number
+ ch, // The current character
+ escapee = {
+ "'": "'",
+ '"': '"',
+ '\\': '\\',
+ '/': '/',
+ '\n': '', // Replace escaped newlines in strings w/ empty string
+ b: '\b',
+ f: '\f',
+ n: '\n',
+ r: '\r',
+ t: '\t'
+ },
+ ws = [
+ ' ',
+ '\t',
+ '\r',
+ '\n',
+ '\v',
+ '\f',
+ '\xA0',
+ '\uFEFF'
+ ],
+ text,
+
+ renderChar = function (chr) {
+ return chr === '' ? 'EOF' : "'" + chr + "'";
+ },
+
+ error = function (m) {
+
+// Call error when something is wrong.
+
+ var error = new SyntaxError();
+ // 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
+ error.message = m + " at line " + lineNumber + " column " + columnNumber + " of the JSON5 data. Still to read: " + JSON.stringify(text.substring(at - 1, at + 19));
+ error.at = at;
+ // These two property names have been chosen to agree with the ones in Gecko, the only popular
+ // environment which seems to supply this info on JSON.parse
+ error.lineNumber = lineNumber;
+ error.columnNumber = columnNumber;
+ throw error;
+ },
+
+ next = function (c) {
+
+// If a c parameter is provided, verify that it matches the current character.
+
+ if (c && c !== ch) {
+ error("Expected " + renderChar(c) + " instead of " + renderChar(ch));
+ }
+
+// Get the next character. When there are no more characters,
+// return the empty string.
+
+ ch = text.charAt(at);
+ at++;
+ columnNumber++;
+ if (ch === '\n' || ch === '\r' && peek() !== '\n') {
+ lineNumber++;
+ columnNumber = 0;
+ }
+ return ch;
+ },
+
+ peek = function () {
+
+// Get the next character without consuming it or
+// assigning it to the ch varaible.
+
+ return text.charAt(at);
+ },
+
+ identifier = function () {
+
+// Parse an identifier. Normally, reserved words are disallowed here, but we
+// only use this for unquoted object keys, where reserved words are allowed,
+// so we don't check for those here. References:
+// - http://es5.github.com/#x7.6
+// - https://developer.mozilla.org/en/Core_JavaScript_1.5_Guide/Core_Language_Features#Variables
+// - http://docstore.mik.ua/orelly/webprog/jscript/ch02_07.htm
+// TODO Identifiers can have Unicode "letters" in them; add support for those.
+
+ var key = ch;
+
+ // Identifiers must start with a letter, _ or $.
+ if ((ch !== '_' && ch !== '$') &&
+ (ch < 'a' || ch > 'z') &&
+ (ch < 'A' || ch > 'Z')) {
+ error("Bad identifier as unquoted key");
+ }
+
+ // Subsequent characters can contain digits.
+ while (next() && (
+ ch === '_' || ch === '$' ||
+ (ch >= 'a' && ch <= 'z') ||
+ (ch >= 'A' && ch <= 'Z') ||
+ (ch >= '0' && ch <= '9'))) {
+ key += ch;
+ }
+
+ return key;
+ },
+
+ number = function () {
+
+// Parse a number value.
+
+ var number,
+ sign = '',
+ string = '',
+ base = 10;
+
+ if (ch === '-' || ch === '+') {
+ sign = ch;
+ next(ch);
+ }
+
+ // support for Infinity (could tweak to allow other words):
+ if (ch === 'I') {
+ number = word();
+ if (typeof number !== 'number' || isNaN(number)) {
+ error('Unexpected word for number');
+ }
+ return (sign === '-') ? -number : number;
+ }
+
+ // support for NaN
+ if (ch === 'N' ) {
+ number = word();
+ if (!isNaN(number)) {
+ error('expected word to be NaN');
+ }
+ // ignore sign as -NaN also is NaN
+ return number;
+ }
+
+ if (ch === '0') {
+ string += ch;
+ next();
+ if (ch === 'x' || ch === 'X') {
+ string += ch;
+ next();
+ base = 16;
+ } else if (ch >= '0' && ch <= '9') {
+ error('Octal literal');
+ }
+ }
+
+ switch (base) {
+ case 10:
+ while (ch >= '0' && ch <= '9' ) {
+ string += ch;
+ next();
+ }
+ if (ch === '.') {
+ string += '.';
+ while (next() && ch >= '0' && ch <= '9') {
+ string += ch;
+ }
+ }
+ if (ch === 'e' || ch === 'E') {
+ string += ch;
+ next();
+ if (ch === '-' || ch === '+') {
+ string += ch;
+ next();
+ }
+ while (ch >= '0' && ch <= '9') {
+ string += ch;
+ next();
+ }
+ }
+ break;
+ case 16:
+ while (ch >= '0' && ch <= '9' || ch >= 'A' && ch <= 'F' || ch >= 'a' && ch <= 'f') {
+ string += ch;
+ next();
+ }
+ break;
+ }
+
+ if(sign === '-') {
+ number = -string;
+ } else {
+ number = +string;
+ }
+
+ if (!isFinite(number)) {
+ error("Bad number");
+ } else {
+ return number;
+ }
+ },
+
+ string = function () {
+
+// Parse a string value.
+
+ var hex,
+ i,
+ string = '',
+ delim, // double quote or single quote
+ uffff;
+
+// When parsing for string values, we must look for ' or " and \ characters.
+
+ if (ch === '"' || ch === "'") {
+ delim = ch;
+ while (next()) {
+ if (ch === delim) {
+ next();
+ return string;
+ } else if (ch === '\\') {
+ next();
+ if (ch === 'u') {
+ uffff = 0;
+ for (i = 0; i < 4; i += 1) {
+ hex = parseInt(next(), 16);
+ if (!isFinite(hex)) {
+ break;
+ }
+ uffff = uffff * 16 + hex;
+ }
+ string += String.fromCharCode(uffff);
+ } else if (ch === '\r') {
+ if (peek() === '\n') {
+ next();
+ }
+ } else if (typeof escapee[ch] === 'string') {
+ string += escapee[ch];
+ } else {
+ break;
+ }
+ } else if (ch === '\n') {
+ // unescaped newlines are invalid; see:
+ // https://github.com/aseemk/json5/issues/24
+ // TODO this feels special-cased; are there other
+ // invalid unescaped chars?
+ break;
+ } else {
+ string += ch;
+ }
+ }
+ }
+ error("Bad string");
+ },
+
+ inlineComment = function () {
+
+// Skip an inline comment, assuming this is one. The current character should
+// be the second / character in the // pair that begins this inline comment.
+// To finish the inline comment, we look for a newline or the end of the text.
+
+ if (ch !== '/') {
+ error("Not an inline comment");
+ }
+
+ do {
+ next();
+ if (ch === '\n' || ch === '\r') {
+ next();
+ return;
+ }
+ } while (ch);
+ },
+
+ blockComment = function () {
+
+// Skip a block comment, assuming this is one. The current character should be
+// the * character in the /* pair that begins this block comment.
+// To finish the block comment, we look for an ending */ pair of characters,
+// but we also watch for the end of text before the comment is terminated.
+
+ if (ch !== '*') {
+ error("Not a block comment");
+ }
+
+ do {
+ next();
+ while (ch === '*') {
+ next('*');
+ if (ch === '/') {
+ next('/');
+ return;
+ }
+ }
+ } while (ch);
+
+ error("Unterminated block comment");
+ },
+
+ comment = function () {
+
+// Skip a comment, whether inline or block-level, assuming this is one.
+// Comments always begin with a / character.
+
+ if (ch !== '/') {
+ error("Not a comment");
+ }
+
+ next('/');
+
+ if (ch === '/') {
+ inlineComment();
+ } else if (ch === '*') {
+ blockComment();
+ } else {
+ error("Unrecognized comment");
+ }
+ },
+
+ white = function () {
+
+// Skip whitespace and comments.
+// Note that we're detecting comments by only a single / character.
+// This works since regular expressions are not valid JSON(5), but this will
+// break if there are other valid values that begin with a / character!
+
+ while (ch) {
+ if (ch === '/') {
+ comment();
+ } else if (ws.indexOf(ch) >= 0) {
+ next();
+ } else {
+ return;
+ }
+ }
+ },
+
+ word = function () {
+
+// true, false, or null.
+
+ switch (ch) {
+ case 't':
+ next('t');
+ next('r');
+ next('u');
+ next('e');
+ return true;
+ case 'f':
+ next('f');
+ next('a');
+ next('l');
+ next('s');
+ next('e');
+ return false;
+ case 'n':
+ next('n');
+ next('u');
+ next('l');
+ next('l');
+ return null;
+ case 'I':
+ next('I');
+ next('n');
+ next('f');
+ next('i');
+ next('n');
+ next('i');
+ next('t');
+ next('y');
+ return Infinity;
+ case 'N':
+ next( 'N' );
+ next( 'a' );
+ next( 'N' );
+ return NaN;
+ }
+ error("Unexpected " + renderChar(ch));
+ },
+
+ value, // Place holder for the value function.
+
+ array = function () {
+
+// Parse an array value.
+
+ var array = [];
+
+ if (ch === '[') {
+ next('[');
+ white();
+ while (ch) {
+ if (ch === ']') {
+ next(']');
+ return array; // Potentially empty array
+ }
+ // ES5 allows omitting elements in arrays, e.g. [,] and
+ // [,null]. We don't allow this in JSON5.
+ if (ch === ',') {
+ error("Missing array element");
+ } else {
+ array.push(value());
+ }
+ white();
+ // If there's no comma after this value, this needs to
+ // be the end of the array.
+ if (ch !== ',') {
+ 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);
+};