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util: restore all information in inspect #22437

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util: restore all information in inspect #22437

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83 changes: 42 additions & 41 deletions lib/util.js
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Original file line number Diff line number Diff line change
Expand Up @@ -513,13 +513,6 @@ function getPrefix(constructor, tag, fallback) {
return '';
}

function addExtraKeys(source, target, keys) {
for (const key of keys) {
target[key] = source[key];
}
return target;
}

function findTypedConstructor(value) {
for (const [check, clazz] of [
[isUint8Array, Uint8Array],
Expand All @@ -535,14 +528,36 @@ function findTypedConstructor(value) {
[isBigUint64Array, BigUint64Array]
]) {
if (check(value)) {
return new clazz(value);
return clazz;
}
}
return value;
}

const getBoxedValue = formatPrimitive.bind(null, stylizeNoColor);

function noPrototypeIterator(ctx, value, recurseTimes) {
let newVal;
// TODO: Create a Subclass in case there's no prototype and show
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nit: /TODO:/TODO(@BridgeAR):

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Will fix while landing.

// `null-prototype`.
if (isSet(value)) {
const clazz = Object.getPrototypeOf(value) || Set;
newVal = new clazz(setValues(value));
} else if (isMap(value)) {
const clazz = Object.getPrototypeOf(value) || Map;
newVal = new clazz(mapEntries(value));
} else if (Array.isArray(value)) {
const clazz = Object.getPrototypeOf(value) || Array;
newVal = new clazz(value.length || 0);
} else if (isTypedArray(value)) {
const clazz = findTypedConstructor(value) || Uint8Array;
newVal = new clazz(value);
}
if (newVal) {
Object.defineProperties(newVal, Object.getOwnPropertyDescriptors(value));
return formatValue(ctx, newVal, recurseTimes);
}
}

// Note: using `formatValue` directly requires the indentation level to be
// corrected by setting `ctx.indentationLvL += diff` and then to decrease the
// value afterwards again.
Expand Down Expand Up @@ -798,39 +813,25 @@ function formatValue(ctx, value, recurseTimes) {
braces = ['{', '}'];
// The input prototype got manipulated. Special handle these.
// We have to rebuild the information so we are able to display everything.
} else if (isSet(value)) {
const newVal = addExtraKeys(value, new Set(setValues(value)), keys);
return formatValue(ctx, newVal, recurseTimes);
} else if (isMap(value)) {
const newVal = addExtraKeys(value, new Map(mapEntries(value)), keys);
return formatValue(ctx, newVal, recurseTimes);
} else if (Array.isArray(value)) {
// The prefix is not always possible to fully reconstruct.
const prefix = getPrefix(constructor, tag);
braces = [`${prefix === 'Array ' ? '' : prefix}[`, ']'];
formatter = formatArray;
const newValue = [];
newValue.length = value.length;
value = addExtraKeys(value, newValue, keys);
} else if (isTypedArray(value)) {
const newValue = findTypedConstructor(value);
value = addExtraKeys(value, newValue, keys.slice(newValue.length));
// The prefix is not always possible to fully reconstruct.
braces = [`${getPrefix(getConstructorName(value), tag)}[`, ']'];
formatter = formatTypedArray;
} else if (isMapIterator(value)) {
braces = [`[${tag || 'Map Iterator'}] {`, '}'];
formatter = formatMapIterator;
} else if (isSetIterator(value)) {
braces = [`[${tag || 'Set Iterator'}] {`, '}'];
formatter = formatSetIterator;
// Handle other regular objects again.
} else if (keyLength === 0) {
if (isExternal(value))
return ctx.stylize('[External]', 'special');
return `${getPrefix(constructor, tag)}{}`;
} else {
braces[0] = `${getPrefix(constructor, tag)}{`;
const specialIterator = noPrototypeIterator(ctx, value, recurseTimes);
if (specialIterator) {
return specialIterator;
}
if (isMapIterator(value)) {
braces = [`[${tag || 'Map Iterator'}] {`, '}'];
formatter = formatMapIterator;
} else if (isSetIterator(value)) {
braces = [`[${tag || 'Set Iterator'}] {`, '}'];
formatter = formatSetIterator;
// Handle other regular objects again.
} else if (keyLength === 0) {
if (isExternal(value))
return ctx.stylize('[External]', 'special');
return `${getPrefix(constructor, tag)}{}`;
} else {
braces[0] = `${getPrefix(constructor, tag)}{`;
}
}
}

Expand Down
21 changes: 3 additions & 18 deletions test/parallel/test-util-inspect.js
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Original file line number Diff line number Diff line change
Expand Up @@ -1557,24 +1557,6 @@ assert.strictEqual(util.inspect('"\''), '`"\'`');
// eslint-disable-next-line no-template-curly-in-string
assert.strictEqual(util.inspect('"\'${a}'), "'\"\\'${a}'");

// Manipulating the Symbol.iterator should still produce nice results.
[
[[1, 2], '[ 1, 2 ]'],
[[, , 5, , , , ], '[ <2 empty items>, 5, <3 empty items> ]'],
[new Set([1, 2]), 'Set { 1, 2 }'],
[new Map([[1, 2]]), 'Map { 1 => 2 }'],
[new Uint8Array(2), 'Uint8Array [ 0, 0 ]'],
// It seems like the following can not be fully restored :(
[new Set([1, 2]).entries(), 'Object [Set Iterator] {}'],
[new Map([[1, 2]]).keys(), 'Object [Map Iterator] {}'],
].forEach(([value, expected]) => {
// "Remove the Symbol.iterator"
Object.defineProperty(value, Symbol.iterator, {
value: false
});
assert.strictEqual(util.inspect(value), expected);
});

// Verify the output in case the value has no prototype.
// Sadly, these cases can not be fully inspected :(
[
Expand Down Expand Up @@ -1630,6 +1612,9 @@ assert.strictEqual(util.inspect('"\'${a}'), "'\"\\'${a}'");
);
value.foo = 'bar';
assert.notStrictEqual(util.inspect(value), expected);
delete value.foo;
value[Symbol('foo')] = 'yeah';
assert.notStrictEqual(util.inspect(value), expected);
});

assert.strictEqual(inspect(1n), '1n');
Expand Down