444 lines
12 KiB
JavaScript
444 lines
12 KiB
JavaScript
var BigNumber = null;
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// regexpxs extracted from
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// (c) BSD-3-Clause
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// https://github.com/fastify/secure-json-parse/graphs/contributors and https://github.com/hapijs/bourne/graphs/contributors
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const suspectProtoRx = /(?:_|\\u005[Ff])(?:_|\\u005[Ff])(?:p|\\u0070)(?:r|\\u0072)(?:o|\\u006[Ff])(?:t|\\u0074)(?:o|\\u006[Ff])(?:_|\\u005[Ff])(?:_|\\u005[Ff])/;
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const suspectConstructorRx = /(?:c|\\u0063)(?:o|\\u006[Ff])(?:n|\\u006[Ee])(?:s|\\u0073)(?:t|\\u0074)(?:r|\\u0072)(?:u|\\u0075)(?:c|\\u0063)(?:t|\\u0074)(?:o|\\u006[Ff])(?:r|\\u0072)/;
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/*
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json_parse.js
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2012-06-20
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Public Domain.
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NO WARRANTY EXPRESSED OR IMPLIED. USE AT YOUR OWN RISK.
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This file creates a json_parse function.
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During create you can (optionally) specify some behavioural switches
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require('json-bigint')(options)
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The optional options parameter holds switches that drive certain
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aspects of the parsing process:
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* options.strict = true will warn about duplicate-key usage in the json.
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The default (strict = false) will silently ignore those and overwrite
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values for keys that are in duplicate use.
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The resulting function follows this signature:
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json_parse(text, reviver)
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This method parses a JSON text to produce an object or array.
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It can throw a SyntaxError exception.
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The optional reviver parameter is a function that can filter and
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transform the results. It receives each of the keys and values,
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and its return value is used instead of the original value.
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If it returns what it received, then the structure is not modified.
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If it returns undefined then the member is deleted.
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Example:
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// Parse the text. Values that look like ISO date strings will
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// be converted to Date objects.
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myData = json_parse(text, function (key, value) {
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var a;
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if (typeof value === 'string') {
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a =
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/^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2}(?:\.\d*)?)Z$/.exec(value);
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if (a) {
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return new Date(Date.UTC(+a[1], +a[2] - 1, +a[3], +a[4],
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+a[5], +a[6]));
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}
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}
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return value;
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});
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This is a reference implementation. You are free to copy, modify, or
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redistribute.
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This code should be minified before deployment.
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See http://javascript.crockford.com/jsmin.html
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USE YOUR OWN COPY. IT IS EXTREMELY UNWISE TO LOAD CODE FROM SERVERS YOU DO
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NOT CONTROL.
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*/
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/*members "", "\"", "\/", "\\", at, b, call, charAt, f, fromCharCode,
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hasOwnProperty, message, n, name, prototype, push, r, t, text
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*/
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var json_parse = function (options) {
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'use strict';
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// This is a function that can parse a JSON 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 JSON 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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// Default options one can override by passing options to the parse()
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var _options = {
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strict: false, // not being strict means do not generate syntax errors for "duplicate key"
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storeAsString: false, // toggles whether the values should be stored as BigNumber (default) or a string
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alwaysParseAsBig: false, // toggles whether all numbers should be Big
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useNativeBigInt: false, // toggles whether to use native BigInt instead of bignumber.js
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protoAction: 'error',
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constructorAction: 'error',
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};
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// If there are options, then use them to override the default _options
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if (options !== undefined && options !== null) {
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if (options.strict === true) {
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_options.strict = true;
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}
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if (options.storeAsString === true) {
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_options.storeAsString = true;
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}
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_options.alwaysParseAsBig =
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options.alwaysParseAsBig === true ? options.alwaysParseAsBig : false;
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_options.useNativeBigInt =
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options.useNativeBigInt === true ? options.useNativeBigInt : false;
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if (typeof options.constructorAction !== 'undefined') {
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if (
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options.constructorAction === 'error' ||
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options.constructorAction === 'ignore' ||
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options.constructorAction === 'preserve'
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) {
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_options.constructorAction = options.constructorAction;
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} else {
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throw new Error(
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`Incorrect value for constructorAction option, must be "error", "ignore" or undefined but passed ${options.constructorAction}`
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);
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}
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}
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if (typeof options.protoAction !== 'undefined') {
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if (
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options.protoAction === 'error' ||
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options.protoAction === 'ignore' ||
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options.protoAction === 'preserve'
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) {
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_options.protoAction = options.protoAction;
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} else {
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throw new Error(
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`Incorrect value for protoAction option, must be "error", "ignore" or undefined but passed ${options.protoAction}`
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);
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}
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}
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}
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var at, // The index of the current character
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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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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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text,
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error = function (m) {
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// Call error when something is wrong.
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throw {
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name: 'SyntaxError',
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message: m,
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at: at,
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text: text,
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};
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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 '" + c + "' instead of '" + 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 += 1;
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return ch;
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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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string = '';
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if (ch === '-') {
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string = '-';
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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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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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number = +string;
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if (!isFinite(number)) {
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error('Bad number');
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} else {
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if (BigNumber == null) BigNumber = require('bignumber.js');
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//if (number > 9007199254740992 || number < -9007199254740992)
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// Bignumber has stricter check: everything with length > 15 digits disallowed
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if (string.length > 15)
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return _options.storeAsString
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? string
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: _options.useNativeBigInt
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? BigInt(string)
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: new BigNumber(string);
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else
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return !_options.alwaysParseAsBig
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? number
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: _options.useNativeBigInt
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? BigInt(number)
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: new BigNumber(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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uffff;
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// When parsing for string values, we must look for " and \ characters.
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if (ch === '"') {
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var startAt = at;
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while (next()) {
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if (ch === '"') {
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if (at - 1 > startAt) string += text.substring(startAt, at - 1);
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next();
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return string;
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}
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if (ch === '\\') {
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if (at - 1 > startAt) string += text.substring(startAt, at - 1);
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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 (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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startAt = at;
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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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white = function () {
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// Skip whitespace.
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while (ch && ch <= ' ') {
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next();
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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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}
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error("Unexpected '" + 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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if (ch === ']') {
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next(']');
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return array; // empty array
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}
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while (ch) {
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array.push(value());
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white();
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if (ch === ']') {
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next(']');
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return array;
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}
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next(',');
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white();
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}
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}
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error('Bad array');
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},
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object = function () {
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// Parse an object value.
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var key,
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object = Object.create(null);
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if (ch === '{') {
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next('{');
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white();
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if (ch === '}') {
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next('}');
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return object; // empty object
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}
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while (ch) {
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key = string();
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white();
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next(':');
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if (
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_options.strict === true &&
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Object.hasOwnProperty.call(object, key)
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) {
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error('Duplicate key "' + key + '"');
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}
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if (suspectProtoRx.test(key) === true) {
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if (_options.protoAction === 'error') {
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error('Object contains forbidden prototype property');
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} else if (_options.protoAction === 'ignore') {
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value();
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} else {
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object[key] = value();
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}
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} else if (suspectConstructorRx.test(key) === true) {
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if (_options.constructorAction === 'error') {
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error('Object contains forbidden constructor property');
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} else if (_options.constructorAction === 'ignore') {
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value();
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} else {
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object[key] = value();
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}
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} else {
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object[key] = value();
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}
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white();
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if (ch === '}') {
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next('}');
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return object;
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}
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next(',');
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white();
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}
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}
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error('Bad object');
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};
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value = function () {
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// Parse a JSON value. It could be an object, an array, a string, a number,
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// or a word.
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white();
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switch (ch) {
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case '{':
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return object();
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case '[':
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return array();
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case '"':
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return string();
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case '-':
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return number();
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default:
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return ch >= '0' && ch <= '9' ? number() : word();
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}
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};
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// Return the json_parse function. It will have access to all of the above
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// functions and variables.
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return function (source, reviver) {
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var result;
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text = source + '';
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at = 0;
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ch = ' ';
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result = value();
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white();
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if (ch) {
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error('Syntax error');
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}
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// If there is a reviver function, we recursively walk the new structure,
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// passing each name/value pair to the reviver function for possible
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// transformation, starting with a temporary root object that holds the result
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// in an empty key. If there is not a reviver function, we simply return the
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// result.
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return typeof reviver === 'function'
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? (function walk(holder, key) {
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var k,
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v,
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value = holder[key];
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if (value && typeof value === 'object') {
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Object.keys(value).forEach(function (k) {
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v = walk(value, k);
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if (v !== undefined) {
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value[k] = v;
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} else {
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delete value[k];
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}
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});
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}
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return reviver.call(holder, key, value);
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})({ '': result }, '')
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: result;
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};
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};
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module.exports = json_parse;
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