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252 lines
8.3 KiB
252 lines
8.3 KiB
4 weeks ago
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'use strict';
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var $ = require('../internals/export');
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var DESCRIPTORS = require('../internals/descriptors');
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var globalThis = require('../internals/global-this');
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var getBuiltIn = require('../internals/get-built-in');
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var uncurryThis = require('../internals/function-uncurry-this');
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var call = require('../internals/function-call');
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var isCallable = require('../internals/is-callable');
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var isObject = require('../internals/is-object');
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var isArray = require('../internals/is-array');
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var hasOwn = require('../internals/has-own-property');
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var toString = require('../internals/to-string');
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var lengthOfArrayLike = require('../internals/length-of-array-like');
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var createProperty = require('../internals/create-property');
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var fails = require('../internals/fails');
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var parseJSONString = require('../internals/parse-json-string');
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var NATIVE_SYMBOL = require('../internals/symbol-constructor-detection');
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var JSON = globalThis.JSON;
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var Number = globalThis.Number;
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var SyntaxError = globalThis.SyntaxError;
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var nativeParse = JSON && JSON.parse;
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var enumerableOwnProperties = getBuiltIn('Object', 'keys');
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// eslint-disable-next-line es/no-object-getownpropertydescriptor -- safe
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var getOwnPropertyDescriptor = Object.getOwnPropertyDescriptor;
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var at = uncurryThis(''.charAt);
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var slice = uncurryThis(''.slice);
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var exec = uncurryThis(/./.exec);
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var push = uncurryThis([].push);
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var IS_DIGIT = /^\d$/;
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var IS_NON_ZERO_DIGIT = /^[1-9]$/;
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var IS_NUMBER_START = /^[\d-]$/;
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var IS_WHITESPACE = /^[\t\n\r ]$/;
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var PRIMITIVE = 0;
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var OBJECT = 1;
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var $parse = function (source, reviver) {
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source = toString(source);
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var context = new Context(source, 0, '');
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var root = context.parse();
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var value = root.value;
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var endIndex = context.skip(IS_WHITESPACE, root.end);
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if (endIndex < source.length) {
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throw new SyntaxError('Unexpected extra character: "' + at(source, endIndex) + '" after the parsed data at: ' + endIndex);
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}
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return isCallable(reviver) ? internalize({ '': value }, '', reviver, root) : value;
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};
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var internalize = function (holder, name, reviver, node) {
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var val = holder[name];
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var unmodified = node && val === node.value;
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var context = unmodified && typeof node.source == 'string' ? { source: node.source } : {};
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var elementRecordsLen, keys, len, i, P;
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if (isObject(val)) {
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var nodeIsArray = isArray(val);
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var nodes = unmodified ? node.nodes : nodeIsArray ? [] : {};
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if (nodeIsArray) {
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elementRecordsLen = nodes.length;
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len = lengthOfArrayLike(val);
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for (i = 0; i < len; i++) {
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internalizeProperty(val, i, internalize(val, '' + i, reviver, i < elementRecordsLen ? nodes[i] : undefined));
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}
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} else {
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keys = enumerableOwnProperties(val);
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len = lengthOfArrayLike(keys);
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for (i = 0; i < len; i++) {
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P = keys[i];
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internalizeProperty(val, P, internalize(val, P, reviver, hasOwn(nodes, P) ? nodes[P] : undefined));
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}
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}
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}
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return call(reviver, holder, name, val, context);
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};
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var internalizeProperty = function (object, key, value) {
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if (DESCRIPTORS) {
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var descriptor = getOwnPropertyDescriptor(object, key);
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if (descriptor && !descriptor.configurable) return;
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}
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if (value === undefined) delete object[key];
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else createProperty(object, key, value);
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};
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var Node = function (value, end, source, nodes) {
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this.value = value;
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this.end = end;
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this.source = source;
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this.nodes = nodes;
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};
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var Context = function (source, index) {
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this.source = source;
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this.index = index;
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};
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// https://www.json.org/json-en.html
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Context.prototype = {
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fork: function (nextIndex) {
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return new Context(this.source, nextIndex);
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},
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parse: function () {
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var source = this.source;
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var i = this.skip(IS_WHITESPACE, this.index);
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var fork = this.fork(i);
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var chr = at(source, i);
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if (exec(IS_NUMBER_START, chr)) return fork.number();
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switch (chr) {
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case '{':
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return fork.object();
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case '[':
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return fork.array();
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case '"':
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return fork.string();
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case 't':
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return fork.keyword(true);
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case 'f':
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return fork.keyword(false);
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case 'n':
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return fork.keyword(null);
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} throw new SyntaxError('Unexpected character: "' + chr + '" at: ' + i);
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},
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node: function (type, value, start, end, nodes) {
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return new Node(value, end, type ? null : slice(this.source, start, end), nodes);
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},
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object: function () {
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var source = this.source;
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var i = this.index + 1;
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var expectKeypair = false;
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var object = {};
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var nodes = {};
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while (i < source.length) {
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i = this.until(['"', '}'], i);
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if (at(source, i) === '}' && !expectKeypair) {
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i++;
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break;
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}
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// Parsing the key
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var result = this.fork(i).string();
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var key = result.value;
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i = result.end;
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i = this.until([':'], i) + 1;
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// Parsing value
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i = this.skip(IS_WHITESPACE, i);
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result = this.fork(i).parse();
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createProperty(nodes, key, result);
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createProperty(object, key, result.value);
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i = this.until([',', '}'], result.end);
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var chr = at(source, i);
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if (chr === ',') {
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expectKeypair = true;
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i++;
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} else if (chr === '}') {
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i++;
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break;
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}
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}
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return this.node(OBJECT, object, this.index, i, nodes);
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},
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array: function () {
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var source = this.source;
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var i = this.index + 1;
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var expectElement = false;
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var array = [];
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var nodes = [];
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while (i < source.length) {
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i = this.skip(IS_WHITESPACE, i);
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if (at(source, i) === ']' && !expectElement) {
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i++;
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break;
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}
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var result = this.fork(i).parse();
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push(nodes, result);
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push(array, result.value);
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i = this.until([',', ']'], result.end);
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if (at(source, i) === ',') {
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expectElement = true;
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i++;
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} else if (at(source, i) === ']') {
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i++;
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break;
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}
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}
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return this.node(OBJECT, array, this.index, i, nodes);
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},
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string: function () {
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var index = this.index;
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var parsed = parseJSONString(this.source, this.index + 1);
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return this.node(PRIMITIVE, parsed.value, index, parsed.end);
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},
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number: function () {
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var source = this.source;
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var startIndex = this.index;
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var i = startIndex;
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if (at(source, i) === '-') i++;
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if (at(source, i) === '0') i++;
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else if (exec(IS_NON_ZERO_DIGIT, at(source, i))) i = this.skip(IS_DIGIT, i + 1);
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else throw new SyntaxError('Failed to parse number at: ' + i);
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if (at(source, i) === '.') i = this.skip(IS_DIGIT, i + 1);
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if (at(source, i) === 'e' || at(source, i) === 'E') {
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i++;
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if (at(source, i) === '+' || at(source, i) === '-') i++;
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var exponentStartIndex = i;
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i = this.skip(IS_DIGIT, i);
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if (exponentStartIndex === i) throw new SyntaxError("Failed to parse number's exponent value at: " + i);
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}
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return this.node(PRIMITIVE, Number(slice(source, startIndex, i)), startIndex, i);
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},
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keyword: function (value) {
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var keyword = '' + value;
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var index = this.index;
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var endIndex = index + keyword.length;
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if (slice(this.source, index, endIndex) !== keyword) throw new SyntaxError('Failed to parse value at: ' + index);
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return this.node(PRIMITIVE, value, index, endIndex);
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},
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skip: function (regex, i) {
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var source = this.source;
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for (; i < source.length; i++) if (!exec(regex, at(source, i))) break;
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return i;
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},
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until: function (array, i) {
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i = this.skip(IS_WHITESPACE, i);
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var chr = at(this.source, i);
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for (var j = 0; j < array.length; j++) if (array[j] === chr) return i;
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throw new SyntaxError('Unexpected character: "' + chr + '" at: ' + i);
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}
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};
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var NO_SOURCE_SUPPORT = fails(function () {
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var unsafeInt = '9007199254740993';
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var source;
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nativeParse(unsafeInt, function (key, value, context) {
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source = context.source;
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});
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return source !== unsafeInt;
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});
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var PROPER_BASE_PARSE = NATIVE_SYMBOL && !fails(function () {
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// Safari 9 bug
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return 1 / nativeParse('-0 \t') !== -Infinity;
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});
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// `JSON.parse` method
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// https://tc39.es/ecma262/#sec-json.parse
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// https://github.com/tc39/proposal-json-parse-with-source
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$({ target: 'JSON', stat: true, forced: NO_SOURCE_SUPPORT }, {
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parse: function parse(text, reviver) {
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return PROPER_BASE_PARSE && !isCallable(reviver) ? nativeParse(text) : $parse(text, reviver);
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}
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});
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