55 lines
1.8 KiB
JavaScript
55 lines
1.8 KiB
JavaScript
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/**
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* Applies the JSON.parse reviver algorithm as defined in the ECMA-262 spec,
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* in section 24.5.1.1 "Runtime Semantics: InternalizeJSONProperty" of the
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* 2021 edition: https://tc39.es/ecma262/#sec-json.parse
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*
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* Includes extensions for handling Map and Set objects.
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*/
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function applyReviver(reviver, obj, key, val) {
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if (val && typeof val === 'object') {
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if (Array.isArray(val)) {
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for (let i = 0, len = val.length; i < len; ++i) {
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const v0 = val[i];
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const v1 = applyReviver(reviver, val, String(i), v0);
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if (v1 === undefined)
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delete val[i];
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else if (v1 !== v0)
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val[i] = v1;
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}
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}
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else if (val instanceof Map) {
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for (const k of Array.from(val.keys())) {
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const v0 = val.get(k);
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const v1 = applyReviver(reviver, val, k, v0);
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if (v1 === undefined)
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val.delete(k);
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else if (v1 !== v0)
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val.set(k, v1);
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}
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}
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else if (val instanceof Set) {
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for (const v0 of Array.from(val)) {
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const v1 = applyReviver(reviver, val, v0, v0);
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if (v1 === undefined)
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val.delete(v0);
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else if (v1 !== v0) {
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val.delete(v0);
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val.add(v1);
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}
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}
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}
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else {
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for (const [k, v0] of Object.entries(val)) {
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const v1 = applyReviver(reviver, val, k, v0);
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if (v1 === undefined)
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delete val[k];
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else if (v1 !== v0)
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val[k] = v1;
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}
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}
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}
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return reviver.call(obj, key, val);
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}
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export { applyReviver };
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