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util: refactor format method. #12407

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util: refactor format method. #12407

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2d11e81
util: refactor format method.Performance improved.
jesus-seijas-sp Apr 14, 2017
181ec8a
util: Added tests and fix bugs
jesus-seijas-sp Apr 14, 2017
aa30bb2
Removed unnecesary newline
jesus-seijas-sp Apr 14, 2017
bf6f8fe
util: refactor format method.
jesus-seijas-sp Apr 15, 2017
9d032c2
util: refactor format method.
jesus-seijas-sp Apr 15, 2017
da7a15e
util: refactor format method
jesus-seijas-sp Apr 16, 2017
78118c7
Fix lint
jesus-seijas-sp Apr 16, 2017
9f762cf
util: refactor format method
jesus-seijas-sp May 31, 2017
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68 changes: 24 additions & 44 deletions lib/util.js
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Original file line number Diff line number Diff line change
Expand Up @@ -59,6 +59,16 @@ function tryStringify(arg) {
}
}

function getFormatFn(code) {
switch (code) {
case 100/*'d'*/: return Number;
case 105/*'i'*/: return parseInt;
case 102/*'f'*/: return parseFloat;
case 106/*'j'*/: return tryStringify;
case 115/*'s'*/: return String;
}
}

exports.format = function(f) {
if (typeof f !== 'string') {
const objects = new Array(arguments.length);
Expand All @@ -75,55 +85,25 @@ exports.format = function(f) {
var str = '';
var a = 1;
var lastPos = 0;
for (var i = 0; i < f.length;) {
var i = 0;
while (i < f.length) {
if (f.charCodeAt(i) === 37/*'%'*/ && i + 1 < f.length) {
switch (f.charCodeAt(i + 1)) {
case 100: // 'd'
if (a >= argLen)
break;
if (lastPos < i)
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I prefer this style because lastPos will always be either less than or equal to i.

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Sorry, I didn't understand this point. You meain only remain lastPos < i instead of i > lastPos ? Thank you!

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I mean I prefer lastPos < i

str += f.slice(lastPos, i);
str += Number(arguments[a++]);
lastPos = i = i + 2;
continue;
case 105: // 'i'
if (a >= argLen)
break;
if (lastPos < i)
str += f.slice(lastPos, i);
str += parseInt(arguments[a++]);
lastPos = i = i + 2;
continue;
case 102: // 'f'
if (a >= argLen)
break;
if (lastPos < i)
str += f.slice(lastPos, i);
str += parseFloat(arguments[a++]);
lastPos = i = i + 2;
continue;
case 106: // 'j'
if (a >= argLen)
break;
if (lastPos < i)
str += f.slice(lastPos, i);
str += tryStringify(arguments[a++]);
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It seems this function was used only here (linter reports 'tryStringify' is defined but never used)

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Fixed. I commited the changes. Also passed all tests.

lastPos = i = i + 2;
continue;
case 115: // 's'
if (a >= argLen)
break;
if (lastPos < i)
str += f.slice(lastPos, i);
str += String(arguments[a++]);
lastPos = i = i + 2;
continue;
case 37: // '%'
if (f.charCodeAt(i + 1) === 37) {
if (lastPos < i)
str += f.slice(lastPos, i);
str += '%';
lastPos = i = i + 2;
continue;
}
if (a < argLen) {
var fn = getFormatFn(f.charCodeAt(i + 1));
if (fn) {
if (lastPos < i)
str += f.slice(lastPos, i);
str += '%';
str += fn(arguments[a++]);
lastPos = i = i + 2;
continue;
}
}
}
++i;
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8 changes: 8 additions & 0 deletions test/parallel/test-util-format.js
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Original file line number Diff line number Diff line change
Expand Up @@ -96,6 +96,8 @@ assert.strictEqual(util.format('%%s%s', 'foo'), '%sfoo');
assert.strictEqual(util.format('%s:%s'), '%s:%s');
assert.strictEqual(util.format('%s:%s', undefined), 'undefined:%s');
assert.strictEqual(util.format('%s:%s', 'foo'), 'foo:%s');
assert.strictEqual(util.format('%s:%i', 'foo'), 'foo:%i');
assert.strictEqual(util.format('%s:%f', 'foo'), 'foo:%f');
assert.strictEqual(util.format('%s:%s', 'foo', 'bar'), 'foo:bar');
assert.strictEqual(util.format('%s:%s', 'foo', 'bar', 'baz'), 'foo:bar baz');
assert.strictEqual(util.format('%%%s%%', 'hi'), '%hi%');
Expand All @@ -104,6 +106,12 @@ assert.strictEqual(util.format('%sbc%%def', 'a'), 'abc%def');
assert.strictEqual(util.format('%d:%d', 12, 30), '12:30');
assert.strictEqual(util.format('%d:%d', 12), '12:%d');
assert.strictEqual(util.format('%d:%d'), '%d:%d');
assert.strictEqual(util.format('%i:%i', 12, 30), '12:30');
assert.strictEqual(util.format('%i:%i', 12), '12:%i');
assert.strictEqual(util.format('%i:%i'), '%i:%i');
assert.strictEqual(util.format('%f:%f', 12, 30), '12:30');
assert.strictEqual(util.format('%f:%f', 12), '12:%f');
assert.strictEqual(util.format('%f:%f'), '%f:%f');
assert.strictEqual(util.format('o: %j, a: %j', {}, []), 'o: {}, a: []');
assert.strictEqual(util.format('o: %j, a: %j', {}), 'o: {}, a: %j');
assert.strictEqual(util.format('o: %j, a: %j'), 'o: %j, a: %j');
Expand Down