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util: fix sparse array inspection #22283

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util: fix sparse array inspection #22283

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40 changes: 18 additions & 22 deletions lib/util.js
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Original file line number Diff line number Diff line change
Expand Up @@ -967,33 +967,29 @@ function formatNamespaceObject(ctx, value, recurseTimes, keys) {
function formatSpecialArray(ctx, value, recurseTimes, keys, maxLength, valLen) {
const output = [];
const keyLen = keys.length;
let visibleLength = 0;
let i = 0;
if (keyLen !== 0 && numberRegExp.test(keys[0])) {
for (const key of keys) {
if (visibleLength === maxLength)
for (const key of keys) {
if (output.length === maxLength)
break;
const index = +key;
// Arrays can only have up to 2^32 - 1 entries
if (index > 2 ** 32 - 2)
break;
if (`${i}` !== key) {
if (!numberRegExp.test(key))
break;
const index = +key;
// Arrays can only have up to 2^32 - 1 entries
if (index > 2 ** 32 - 2)
const emptyItems = index - i;
const ending = emptyItems > 1 ? 's' : '';
const message = `<${emptyItems} empty item${ending}>`;
output.push(ctx.stylize(message, 'undefined'));
i = index;
if (output.length === maxLength)
break;
if (i !== index) {
if (!numberRegExp.test(key))
break;
const emptyItems = index - i;
const ending = emptyItems > 1 ? 's' : '';
const message = `<${emptyItems} empty item${ending}>`;
output.push(ctx.stylize(message, 'undefined'));
i = index;
if (++visibleLength === maxLength)
break;
}
output.push(formatProperty(ctx, value, recurseTimes, key, 1));
visibleLength++;
i++;
}
output.push(formatProperty(ctx, value, recurseTimes, key, 1));
i++;
}
if (i < valLen && visibleLength !== maxLength) {
if (i < valLen && output.length !== maxLength) {
const len = valLen - i;
const ending = len > 1 ? 's' : '';
const message = `<${len} empty item${ending}>`;
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13 changes: 13 additions & 0 deletions test/parallel/test-util-inspect.js
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Original file line number Diff line number Diff line change
Expand Up @@ -345,6 +345,19 @@ assert.strictEqual(
"[ <2 empty items>, '00': 1, '01': 2 ]");
assert.strictEqual(util.inspect(arr2, { showHidden: true }),
"[ <2 empty items>, [length]: 2, '00': 1, '01': 2 ]");
delete arr2['00'];
arr2[0] = 0;
assert.strictEqual(util.inspect(arr2),
"[ 0, <1 empty item>, '01': 2 ]");
assert.strictEqual(util.inspect(arr2, { showHidden: true }),
"[ 0, <1 empty item>, [length]: 2, '01': 2 ]");
delete arr2['01'];
arr2[2 ** 32 - 2] = 'max';
arr2[2 ** 32 - 1] = 'too far';
assert.strictEqual(
util.inspect(arr2),
"[ 0, <4294967293 empty items>, 'max', '4294967295': 'too far' ]"
);

const arr3 = [];
arr3[-1] = -1;
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