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https://github.com/vercel-labs/scriptc.git
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Chris Tate
150e529d84
- Share bounded JSON scanning and copy string spans in chunks. - Avoid temporary key snapshots for primitive containers. - Preserve Unicode, property ordering, and callback behavior.
75 lines
3.0 KiB
JavaScript
75 lines
3.0 KiB
JavaScript
// Word boundaries, escaped prefixes and UTF-8 tails share the same JSON path.
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for (let length = 0; length < 40; length++) {
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const prefix = "a".repeat(length);
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const value = prefix + "\n\t\u0000\"\\雪🙂" + "tail".repeat(length);
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const text = JSON.stringify({ [prefix + "\"key"]: value, value, enabled: true });
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console.log(text, JSON.stringify(JSON.parse(text)) === text);
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console.log(JSON.parse('"' + prefix + '\\u0041long plain suffix\\n雪🙂"'));
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try {
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JSON.parse('"' + prefix + '\u0001"');
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} catch (error) {
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console.log(error instanceof SyntaxError);
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}
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}
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const separators = ["\n", "\r\n", "::", "\u0000", "雪", "🙂", "missing"];
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for (const separator of separators) {
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const text = separator + "ab" + separator + separator + "é🙂" + separator;
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for (const limit of [0, 1, 3, 20, -1, NaN]) {
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console.log(JSON.stringify(text.split(separator, limit)));
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}
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console.log(text.includes(separator), text.indexOf(separator), text.indexOf(separator, 1));
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console.log("".includes(separator), "".indexOf(separator), JSON.stringify("".split(separator)));
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}
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console.log("aaabaaaaab".indexOf("aab"), "aaabaaaaab".indexOf("aab", 3));
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console.log("🙂abc🙂".indexOf("🙂", 1), "🙂abc🙂".indexOf("🙂", 2));
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console.log(JSON.stringify("é🙂".split("", 1)));
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// Primitive records and dense arrays can change shape between serializations.
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const record = JSON.parse('{"empty":"","text":"é🙂","value":1,"active":true,"nil":null}');
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record.omitted = undefined;
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record.symbol = Symbol("value");
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record.value = -0;
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record.large = Infinity;
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Object.defineProperty(record, "hidden", { get() { throw new Error("not enumerable"); } });
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console.log(JSON.stringify(record), JSON.stringify(record, undefined, ".."));
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record["10"] = 10;
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record["2"] = 2;
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record["01"] = 1;
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record["4294967295"] = 3;
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console.log(JSON.stringify(record));
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delete record["2"];
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record.child = { nested: true };
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console.log(JSON.stringify(record));
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const values = JSON.parse('[1,"雪",true,null]');
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values.push(undefined, NaN, -0);
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console.log(JSON.stringify(values), JSON.stringify(values, undefined, 2));
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delete values[1];
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values.extra = "ignored";
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values[2] = "replacement";
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console.log(JSON.stringify(values));
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// Getters, toJSON and replacers retain their live reads and key snapshots.
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const changing = JSON.parse('{"first":1,"later":2}');
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Object.defineProperty(changing, "first", {
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get() { changing.later = 8; changing.extra = 9; return 7; },
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enumerable: true,
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});
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console.log(JSON.stringify(changing), JSON.stringify(changing));
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const outer = JSON.parse('{"child":{},"later":{"value":1}}');
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outer.child.toJSON = function (key) {
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outer.later.value = 5;
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outer.extra = 6;
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return { key, converted: true };
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};
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console.log(JSON.stringify(outer));
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const replaced = JSON.parse('{"first":1,"later":2}');
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console.log(JSON.stringify(replaced, function (key, value) {
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if (key === "first") { this.later = 10; this.extra = 11; }
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return value;
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}));
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const cyclic = JSON.parse('{"value":1}');
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cyclic.self = cyclic;
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try { JSON.stringify(cyclic); } catch (error) { console.log(error instanceof TypeError); }
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