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util: improve .inspect() array grouping
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This improves a couple minor things:

* Arrays that contain entries other than `number` or `bigint` are
  ordered to the left instead of the right.
* The bias towards more columns got increased. That mainly increases
  the number of columns for arrays that contain lots of short entries.
* Columns are now more dense in case they would otherwise have extra
  whitespace in-between two columns.
* The maximum columns got increased from 10 to 15.
* The maximum number of columns per `compact` was increased from
  3 to 4.

PR-URL: #28070
Refs: #27690
Reviewed-By: James M Snell <jasnell@gmail.com>
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@BridgeAR
BridgeAR committed Jun 17, 2019
1 parent 42f5f27 commit 8f4bb19
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Showing 2 changed files with 134 additions and 120 deletions.
74 changes: 48 additions & 26 deletions lib/internal/util/inspect.js
View file
Original file line number Diff line number Diff line change
Expand Up @@ -777,7 +777,7 @@ function formatRaw(ctx, value, recurseTimes, typedArray) {
}

const res = reduceToSingleString(
ctx, output, base, braces, extrasType, recurseTimes);
ctx, output, base, braces, extrasType, recurseTimes, value);
const budget = ctx.budget[ctx.indentationLvl] || 0;
const newLength = budget + res.length;
ctx.budget[ctx.indentationLvl] = newLength;
Expand Down Expand Up @@ -940,7 +940,7 @@ function formatError(err, constructor, tag, ctx) {
return stack;
}

function groupArrayElements(ctx, output) {
function groupArrayElements(ctx, output, value) {
let totalLength = 0;
let maxLength = 0;
let i = 0;
Expand Down Expand Up @@ -972,51 +972,73 @@ function groupArrayElements(ctx, output) {
(totalLength / actualMax > 5 || maxLength <= 6)) {

const approxCharHeights = 2.5;
const bias = 1;
const biasedMax = Math.max(actualMax - 4, 1);
// Dynamically check how many columns seem possible.
const columns = Math.min(
// Ideally a square should be drawn. We expect a character to be about 2.5
// times as high as wide. This is the area formula to calculate a square
// which contains n rectangles of size `actualMax * approxCharHeights`.
// Divide that by `actualMax` to receive the correct number of columns.
// The added bias slightly increases the columns for short entries.
// The added bias increases the columns for short entries.
Math.round(
Math.sqrt(
approxCharHeights * (actualMax - bias) * outputLength
) / (actualMax - bias)
approxCharHeights * biasedMax * outputLength
) / biasedMax
),
// Do not exceed the breakLength.
Math.floor((ctx.breakLength - ctx.indentationLvl) / actualMax),
// Limit array grouping for small `compact` modes as the user requested
// minimal grouping.
ctx.compact * 3,
// Limit the columns to a maximum of ten.
10
ctx.compact * 4,
// Limit the columns to a maximum of fifteen.
15
);
// Return with the original output if no grouping should happen.
if (columns <= 1) {
return output;
}
// Calculate the maximum length of all entries that are visible in the first
// column of the group.
const tmp = [];
let firstLineMaxLength = dataLen[0];
for (i = columns; i < dataLen.length; i += columns) {
if (dataLen[i] > firstLineMaxLength)
firstLineMaxLength = dataLen[i];
const maxLineLength = [];
for (let i = 0; i < columns; i++) {
let lineMaxLength = 0;
for (let j = i; j < output.length; j += columns) {
if (dataLen[j] > lineMaxLength)
lineMaxLength = dataLen[j];
}
lineMaxLength += separatorSpace;
maxLineLength[i] = lineMaxLength;
}
let order = 'padStart';
if (value !== undefined) {
for (let i = 0; i < output.length; i++) {
// eslint-disable-next-line valid-typeof
if (typeof value[i] !== 'number' && typeof value[i] !== 'bigint') {
order = 'padEnd';
break;
}
}
}
// Each iteration creates a single line of grouped entries.
for (i = 0; i < outputLength; i += columns) {
// Calculate extra color padding in case it's active. This has to be done
// line by line as some lines might contain more colors than others.
let colorPadding = output[i].length - dataLen[i];
// Add padding to the first column of the output.
let str = output[i].padStart(firstLineMaxLength + colorPadding, ' ');
for (let i = 0; i < outputLength; i += columns) {
// The last lines may contain less entries than columns.
const max = Math.min(i + columns, outputLength);
for (var j = i + 1; j < max; j++) {
colorPadding = output[j].length - dataLen[j];
str += `, ${output[j].padStart(maxLength + colorPadding, ' ')}`;
let str = '';
let j = i;
for (; j < max - 1; j++) {
// Calculate extra color padding in case it's active. This has to be
// done line by line as some lines might contain more colors than
// others.
const padding = maxLineLength[j - i] + output[j].length - dataLen[j];
str += `${output[j]}, `[order](padding, ' ');
}
if (order === 'padStart') {
const padding = maxLineLength[j - i] +
output[j].length -
dataLen[j] -
separatorSpace;
str += output[j].padStart(padding, ' ');
} else {
str += output[j];
}
tmp.push(str);
}
Expand Down Expand Up @@ -1419,7 +1441,7 @@ function isBelowBreakLength(ctx, output, start, base) {
}

function reduceToSingleString(
ctx, output, base, braces, extrasType, recurseTimes) {
ctx, output, base, braces, extrasType, recurseTimes, value) {
if (ctx.compact !== true) {
if (typeof ctx.compact === 'number' && ctx.compact >= 1) {
// Memorize the original output length. In case the the output is grouped,
Expand All @@ -1428,7 +1450,7 @@ function reduceToSingleString(
// Group array elements together if the array contains at least six
// separate entries.
if (extrasType === kArrayExtrasType && entries > 6) {
output = groupArrayElements(ctx, output);
output = groupArrayElements(ctx, output, value);
}
// `ctx.currentDepth` is set to the most inner depth of the currently
// inspected object part while `recurseTimes` is the actual current depth
Expand Down
180 changes: 86 additions & 94 deletions test/parallel/test-util-inspect.js
View file
Original file line number Diff line number Diff line change
Expand Up @@ -1306,11 +1306,11 @@ if (typeof Symbol !== 'undefined') {
{
const x = new Uint8Array(101);
assert(util.inspect(x).endsWith('1 more item\n]'));
assert(!util.inspect(x, { maxArrayLength: 101 }).endsWith('1 more item\n]'));
assert(!util.inspect(x, { maxArrayLength: 101 }).includes('1 more item'));
assert.strictEqual(util.inspect(x, { maxArrayLength: 0 }),
'Uint8Array [ ... 101 more items ]');
assert(!util.inspect(x, { maxArrayLength: null }).endsWith('1 more item\n]'));
assert(util.inspect(x, { maxArrayLength: Infinity }).endsWith(' 0, 0\n]'));
assert(!util.inspect(x, { maxArrayLength: null }).includes('1 more item'));
assert(util.inspect(x, { maxArrayLength: Infinity }).endsWith(' 0, 0\n]'));
}

{
Expand Down Expand Up @@ -1940,7 +1940,7 @@ assert.strictEqual(util.inspect('"\'${a}'), "'\"\\'${a}'");
[WeakMap, [[[{}, {}]]], '{ <items unknown> }'],
[BigInt64Array,
[10],
'[\n 0n, 0n, 0n,\n 0n, 0n, 0n,\n 0n, 0n, 0n,\n 0n\n]'],
'[\n 0n, 0n, 0n, 0n, 0n,\n 0n, 0n, 0n, 0n, 0n\n]'],
[Date, ['Sun, 14 Feb 2010 11:48:40 GMT'], '2010-02-14T11:48:40.000Z'],
[Date, ['invalid_date'], 'Invalid Date']
].forEach(([base, input, rawExpected]) => {
Expand Down Expand Up @@ -2180,21 +2180,18 @@ assert.strictEqual(
' b: [ 1, 2, [ 1, 2, { a: 1, b: 2, c: 3 } ] ],',
" c: [ 'foo', 4, 444444 ],",
' d: [',
' 0, 1, 4, 3, 16, 5, 36,',
' 7, 64, 9, 100, 11, 144, 13,',
' 196, 15, 256, 17, 324, 19, 400,',
' 21, 484, 23, 576, 25, 676, 27,',
' 784, 29, 900, 31, 1024, 33, 1156,',
' 35, 1296, 37, 1444, 39, 1600, 41,',
' 1764, 43, 1936, 45, 2116, 47, 2304,',
' 49, 2500, 51, 2704, 53, 2916, 55,',
' 3136, 57, 3364, 59, 3600, 61, 3844,',
' 63, 4096, 65, 4356, 67, 4624, 69,',
' 4900, 71, 5184, 73, 5476, 75, 5776,',
' 77, 6084, 79, 6400, 81, 6724, 83,',
' 7056, 85, 7396, 87, 7744, 89, 8100,',
' 91, 8464, 93, 8836, 95, 9216, 97,',
' 9604, 99,',
' 0, 1, 4, 3, 16, 5, 36, 7, 64,',
' 9, 100, 11, 144, 13, 196, 15, 256, 17,',
' 324, 19, 400, 21, 484, 23, 576, 25, 676,',
' 27, 784, 29, 900, 31, 1024, 33, 1156, 35,',
' 1296, 37, 1444, 39, 1600, 41, 1764, 43, 1936,',
' 45, 2116, 47, 2304, 49, 2500, 51, 2704, 53,',
' 2916, 55, 3136, 57, 3364, 59, 3600, 61, 3844,',
' 63, 4096, 65, 4356, 67, 4624, 69, 4900, 71,',
' 5184, 73, 5476, 75, 5776, 77, 6084, 79, 6400,',
' 81, 6724, 83, 7056, 85, 7396, 87, 7744, 89,',
' 8100, 91, 8464, 93, 8836, 95, 9216, 97, 9604,',
' 99,',
' ... 1 more item',
' ],',
' e: [',
Expand Down Expand Up @@ -2226,10 +2223,8 @@ assert.strictEqual(
" 'foobar baz'",
' ],',
' h: [',
' 100, 0, 1,',
' 2, 3, 4,',
' 5, 6, 7,',
' 8',
' 100, 0, 1, 2, 3,',
' 4, 5, 6, 7, 8',
' ],',
' long: [',
" 'This text is too long for grouping!',",
Expand Down Expand Up @@ -2257,15 +2252,15 @@ assert.strictEqual(

expected = [
'[',
' 1, 1, 1,',
' 1, 1, 1,',
' 1, 1, 1,',
' 1, 1, 1,',
' 1, 1, 1,',
' 1, 1, 1,',
' 1, 1, 1,',
' 1, 1, 1,',
' 1, 1, 123456789',
' 1, 1, 1,',
' 1, 1, 1,',
' 1, 1, 1,',
' 1, 1, 1,',
' 1, 1, 1,',
' 1, 1, 1,',
' 1, 1, 1,',
' 1, 1, 1,',
' 1, 1, 123456789',
']'
].join('\n');

Expand Down Expand Up @@ -2295,10 +2290,10 @@ assert.strictEqual(
' b: { x: \u001b[33m5\u001b[39m, c: \u001b[36m[Object]\u001b[39m }',
' },',
' b: [',
" \u001b[32m'foobar'\u001b[39m, \u001b[32m'baz'\u001b[39m,",
" \u001b[32m'foobar'\u001b[39m, \u001b[32m'baz'\u001b[39m,",
" \u001b[32m'foobar'\u001b[39m, \u001b[32m'baz'\u001b[39m,",
" \u001b[32m'foobar'\u001b[39m, \u001b[32m'baz'\u001b[39m,",
" \u001b[32m'foobar'\u001b[39m, \u001b[32m'baz'\u001b[39m,",
" \u001b[32m'foobar'\u001b[39m, \u001b[32m'baz'\u001b[39m,",
" \u001b[32m'foobar'\u001b[39m, \u001b[32m'baz'\u001b[39m,",
" \u001b[32m'foobar'\u001b[39m, \u001b[32m'baz'\u001b[39m,",
" \u001b[32m'foobar'\u001b[39m",
' ]',
'}',
Expand All @@ -2311,26 +2306,23 @@ assert.strictEqual(

expected = [
'[',
' \u001b[33m0\u001b[39m, \u001b[33m1\u001b[39m, \u001b[33m2\u001b[39m,',
' \u001b[33m3\u001b[39m, \u001b[33m4\u001b[39m, \u001b[33m5\u001b[39m,',
' \u001b[33m6\u001b[39m, \u001b[33m7\u001b[39m, \u001b[33m8\u001b[39m,',
' \u001b[33m9\u001b[39m, \u001b[33m10\u001b[39m, \u001b[33m11\u001b[39m,',
' \u001b[33m12\u001b[39m, \u001b[33m13\u001b[39m, \u001b[33m14\u001b[39m,',
' \u001b[33m15\u001b[39m, \u001b[33m16\u001b[39m, \u001b[33m17\u001b[39m,',
' \u001b[33m18\u001b[39m, \u001b[33m19\u001b[39m, \u001b[33m20\u001b[39m,',
' \u001b[33m21\u001b[39m, \u001b[33m22\u001b[39m, \u001b[33m23\u001b[39m,',
' \u001b[33m24\u001b[39m, \u001b[33m25\u001b[39m, \u001b[33m26\u001b[39m,',
' \u001b[33m27\u001b[39m, \u001b[33m28\u001b[39m, \u001b[33m29\u001b[39m,',
' \u001b[33m30\u001b[39m, \u001b[33m31\u001b[39m, \u001b[33m32\u001b[39m,',
' \u001b[33m33\u001b[39m, \u001b[33m34\u001b[39m, \u001b[33m35\u001b[39m,',
' \u001b[33m36\u001b[39m, \u001b[33m37\u001b[39m, \u001b[33m38\u001b[39m,',
' \u001b[33m39\u001b[39m, \u001b[33m40\u001b[39m, \u001b[33m41\u001b[39m,',
' \u001b[33m42\u001b[39m, \u001b[33m43\u001b[39m, \u001b[33m44\u001b[39m,',
' \u001b[33m45\u001b[39m, \u001b[33m46\u001b[39m, \u001b[33m47\u001b[39m,',
' \u001b[33m48\u001b[39m, \u001b[33m49\u001b[39m, \u001b[33m50\u001b[39m,',
' \u001b[33m51\u001b[39m, \u001b[33m52\u001b[39m, \u001b[33m53\u001b[39m,',
' \u001b[33m54\u001b[39m, \u001b[33m55\u001b[39m, \u001b[33m56\u001b[39m,',
' \u001b[33m57\u001b[39m, \u001b[33m58\u001b[39m, \u001b[33m59\u001b[39m',
/* eslint-disable max-len */
' \u001b[33m0\u001b[39m, \u001b[33m1\u001b[39m, \u001b[33m2\u001b[39m, \u001b[33m3\u001b[39m,',
' \u001b[33m4\u001b[39m, \u001b[33m5\u001b[39m, \u001b[33m6\u001b[39m, \u001b[33m7\u001b[39m,',
' \u001b[33m8\u001b[39m, \u001b[33m9\u001b[39m, \u001b[33m10\u001b[39m, \u001b[33m11\u001b[39m,',
' \u001b[33m12\u001b[39m, \u001b[33m13\u001b[39m, \u001b[33m14\u001b[39m, \u001b[33m15\u001b[39m,',
' \u001b[33m16\u001b[39m, \u001b[33m17\u001b[39m, \u001b[33m18\u001b[39m, \u001b[33m19\u001b[39m,',
' \u001b[33m20\u001b[39m, \u001b[33m21\u001b[39m, \u001b[33m22\u001b[39m, \u001b[33m23\u001b[39m,',
' \u001b[33m24\u001b[39m, \u001b[33m25\u001b[39m, \u001b[33m26\u001b[39m, \u001b[33m27\u001b[39m,',
' \u001b[33m28\u001b[39m, \u001b[33m29\u001b[39m, \u001b[33m30\u001b[39m, \u001b[33m31\u001b[39m,',
' \u001b[33m32\u001b[39m, \u001b[33m33\u001b[39m, \u001b[33m34\u001b[39m, \u001b[33m35\u001b[39m,',
' \u001b[33m36\u001b[39m, \u001b[33m37\u001b[39m, \u001b[33m38\u001b[39m, \u001b[33m39\u001b[39m,',
' \u001b[33m40\u001b[39m, \u001b[33m41\u001b[39m, \u001b[33m42\u001b[39m, \u001b[33m43\u001b[39m,',
' \u001b[33m44\u001b[39m, \u001b[33m45\u001b[39m, \u001b[33m46\u001b[39m, \u001b[33m47\u001b[39m,',
' \u001b[33m48\u001b[39m, \u001b[33m49\u001b[39m, \u001b[33m50\u001b[39m, \u001b[33m51\u001b[39m,',
' \u001b[33m52\u001b[39m, \u001b[33m53\u001b[39m, \u001b[33m54\u001b[39m, \u001b[33m55\u001b[39m,',
' \u001b[33m56\u001b[39m, \u001b[33m57\u001b[39m, \u001b[33m58\u001b[39m, \u001b[33m59\u001b[39m',
/* eslint-enable max-len */
']'
].join('\n');

Expand Down Expand Up @@ -2389,44 +2381,44 @@ assert.strictEqual(
);
expected = [
'[',
" 'Object', 'Function', 'Array',",
" 'Number', 'parseFloat', 'parseInt',",
" 'Infinity', 'NaN', 'undefined',",
" 'Boolean', 'String', 'Symbol',",
" 'Date', 'Promise', 'RegExp',",
" 'Error', 'EvalError', 'RangeError',",
" 'ReferenceError', 'SyntaxError', 'TypeError',",
" 'URIError', 'JSON', 'Math',",
" 'console', 'Intl', 'ArrayBuffer',",
" 'Uint8Array', 'Int8Array', 'Uint16Array',",
" 'Int16Array', 'Uint32Array', 'Int32Array',",
" 'Float32Array', 'Float64Array', 'Uint8ClampedArray',",
" 'BigUint64Array', 'BigInt64Array', 'DataView',",
" 'Map', 'BigInt', 'Set',",
" 'WeakMap', 'WeakSet', 'Proxy',",
" 'Reflect', 'decodeURI', 'decodeURIComponent',",
" 'encodeURI', 'encodeURIComponent', 'escape',",
" 'unescape', 'eval', 'isFinite',",
" 'isNaN', 'SharedArrayBuffer', 'Atomics',",
" 'globalThis', 'WebAssembly', 'global',",
" 'process', 'GLOBAL', 'root',",
" 'Buffer', 'URL', 'URLSearchParams',",
" 'TextEncoder', 'TextDecoder', 'clearInterval',",
" 'clearTimeout', 'setInterval', 'setTimeout',",
" 'queueMicrotask', 'clearImmediate', 'setImmediate',",
" 'module', 'require', 'assert',",
" 'async_hooks', 'buffer', 'child_process',",
" 'cluster', 'crypto', 'dgram',",
" 'dns', 'domain', 'events',",
" 'fs', 'http', 'http2',",
" 'https', 'inspector', 'net',",
" 'os', 'path', 'perf_hooks',",
" 'punycode', 'querystring', 'readline',",
" 'repl', 'stream', 'string_decoder',",
" 'tls', 'trace_events', 'tty',",
" 'url', 'v8', 'vm',",
" 'worker_threads', 'zlib', '_',",
" '_error', 'util'",
" 'Object', 'Function', 'Array',",
" 'Number', 'parseFloat', 'parseInt',",
" 'Infinity', 'NaN', 'undefined',",
" 'Boolean', 'String', 'Symbol',",
" 'Date', 'Promise', 'RegExp',",
" 'Error', 'EvalError', 'RangeError',",
" 'ReferenceError', 'SyntaxError', 'TypeError',",
" 'URIError', 'JSON', 'Math',",
" 'console', 'Intl', 'ArrayBuffer',",
" 'Uint8Array', 'Int8Array', 'Uint16Array',",
" 'Int16Array', 'Uint32Array', 'Int32Array',",
" 'Float32Array', 'Float64Array', 'Uint8ClampedArray',",
" 'BigUint64Array', 'BigInt64Array', 'DataView',",
" 'Map', 'BigInt', 'Set',",
" 'WeakMap', 'WeakSet', 'Proxy',",
" 'Reflect', 'decodeURI', 'decodeURIComponent',",
" 'encodeURI', 'encodeURIComponent', 'escape',",
" 'unescape', 'eval', 'isFinite',",
" 'isNaN', 'SharedArrayBuffer', 'Atomics',",
" 'globalThis', 'WebAssembly', 'global',",
" 'process', 'GLOBAL', 'root',",
" 'Buffer', 'URL', 'URLSearchParams',",
" 'TextEncoder', 'TextDecoder', 'clearInterval',",
" 'clearTimeout', 'setInterval', 'setTimeout',",
" 'queueMicrotask', 'clearImmediate', 'setImmediate',",
" 'module', 'require', 'assert',",
" 'async_hooks', 'buffer', 'child_process',",
" 'cluster', 'crypto', 'dgram',",
" 'dns', 'domain', 'events',",
" 'fs', 'http', 'http2',",
" 'https', 'inspector', 'net',",
" 'os', 'path', 'perf_hooks',",
" 'punycode', 'querystring', 'readline',",
" 'repl', 'stream', 'string_decoder',",
" 'tls', 'trace_events', 'tty',",
" 'url', 'v8', 'vm',",
" 'worker_threads', 'zlib', '_',",
" '_error', 'util'",
']'
].join('\n');

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