94 lines
2.6 KiB
JavaScript
94 lines
2.6 KiB
JavaScript
/*! (c) 2020 Andrea Giammarchi */
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const {parse: $parse, stringify: $stringify} = JSON;
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const {keys} = Object;
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const Primitive = String; // it could be Number
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const primitive = 'string'; // it could be 'number'
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const ignore = {};
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const object = 'object';
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const noop = (_, value) => value;
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const primitives = value => (
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value instanceof Primitive ? Primitive(value) : value
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);
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const Primitives = (_, value) => (
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typeof value === primitive ? new Primitive(value) : value
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);
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const revive = (input, parsed, output, $) => {
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const lazy = [];
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for (let ke = keys(output), {length} = ke, y = 0; y < length; y++) {
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const k = ke[y];
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const value = output[k];
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if (value instanceof Primitive) {
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const tmp = input[value];
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if (typeof tmp === object && !parsed.has(tmp)) {
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parsed.add(tmp);
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output[k] = ignore;
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lazy.push({k, a: [input, parsed, tmp, $]});
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}
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else
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output[k] = $.call(output, k, tmp);
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}
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else if (output[k] !== ignore)
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output[k] = $.call(output, k, value);
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}
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for (let {length} = lazy, i = 0; i < length; i++) {
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const {k, a} = lazy[i];
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output[k] = $.call(output, k, revive.apply(null, a));
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}
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return output;
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};
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const set = (known, input, value) => {
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const index = Primitive(input.push(value) - 1);
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known.set(value, index);
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return index;
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};
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export const parse = (text, reviver) => {
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const input = $parse(text, Primitives).map(primitives);
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const value = input[0];
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const $ = reviver || noop;
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const tmp = typeof value === object && value ?
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revive(input, new Set, value, $) :
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value;
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return $.call({'': tmp}, '', tmp);
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};
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export const stringify = (value, replacer, space) => {
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const $ = replacer && typeof replacer === object ?
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(k, v) => (k === '' || -1 < replacer.indexOf(k) ? v : void 0) :
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(replacer || noop);
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const known = new Map;
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const input = [];
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const output = [];
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let i = +set(known, input, $.call({'': value}, '', value));
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let firstRun = !i;
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while (i < input.length) {
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firstRun = true;
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output[i] = $stringify(input[i++], replace, space);
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}
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return '[' + output.join(',') + ']';
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function replace(key, value) {
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if (firstRun) {
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firstRun = !firstRun;
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return value;
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}
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const after = $.call(this, key, value);
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switch (typeof after) {
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case object:
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if (after === null) return after;
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case primitive:
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return known.get(after) || set(known, input, after);
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}
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return after;
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}
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};
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export const toJSON = any => $parse(stringify(any));
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export const fromJSON = any => parse($stringify(any));
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