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Update String#trim #316

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Update String#trim #316

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9c87839
Update String#trim spec compliance
lewisje Jun 26, 2015
65f4e7d
Merge branch 'master' into string-trim-patch
lewisje Oct 19, 2015
fe49878
Merge branch 'master' into string-trim-patch
lewisje Oct 20, 2015
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16 changes: 8 additions & 8 deletions es5-shim.js
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Original file line number Diff line number Diff line change
Expand Up @@ -1519,14 +1519,14 @@ defineProperties(StringPrototype, {

// ES5 15.5.4.20
// whitespace from: http://es5.github.io/#x15.5.4.20
var ws = '\x09\x0A\x0B\x0C\x0D\x20\xA0\u1680\u180E\u2000\u2001\u2002\u2003' +
'\u2004\u2005\u2006\u2007\u2008\u2009\u200A\u202F\u205F\u3000\u2028' +
'\u2029\uFEFF';
var zeroWidth = '\u200b';
var wsRegexChars = '[' + ws + ']';
var trimBeginRegexp = new RegExp('^' + wsRegexChars + wsRegexChars + '*');
var trimEndRegexp = new RegExp(wsRegexChars + wsRegexChars + '*$');
var hasTrimWhitespaceBug = StringPrototype.trim && (ws.trim() || !zeroWidth.trim());
var ws = '\t\n\v\f\r \xA0\u1680\u180E\u2000\u2001\u2002\u2003\u2004\u2005' +
'\u2006\u2007\u2008\u2009\u200A\u200B\u2028\u2029\u202F\u205F\u3000\uFEFF';
var nxtLine = '\x85';
var wsRegexChars = '[' + ws + '][' + ws + ']*';
var trimBeginRegexp = new RegExp('^' + wsRegexChars);
var trimEndRegexp = new RegExp(wsRegexChars + '$');
var hasTrimWhitespaceBug = typeof StringPrototype.trim === 'function' &&
(ws.trim() !== '' || nxtLine.trim() === '');
defineProperties(StringPrototype, {
// http://blog.stevenlevithan.com/archives/faster-trim-javascript
// http://perfectionkills.com/whitespace-deviations/
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10 changes: 6 additions & 4 deletions tests/spec/s-string.js
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Expand Up @@ -4,16 +4,18 @@ describe('String', function () {
'use strict';

describe('trim', function () {
var test = '\x09\x0A\x0B\x0C\x0D\x20\xA0\u1680\u180E\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200A\u202F\u205F\u3000\u2028\u2029\uFEFFHello, World!\x09\x0A\x0B\x0C\x0D\x20\xA0\u1680\u180E\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200A\u202F\u205F\u3000\u2028\u2029\uFEFF';
var wsp = '\t\n\v\f\r \xA0\u1680\u180E\u2000\u2001\u2002\u2003\u2004\u2005' +
'\u2006\u2007\u2008\u2009\u200A\u200B\u2028\u2029\u202F\u205F\u3000\uFEFF';
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let's leave this on one line - arbitrary line length limits are silly. it will show the diff better also.

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I agree with this sentiment; the reason I had broken it up was that I thought the project had line-length limits.

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If it used to, it doesn't anymore :-D

var test = [wsp, 'Hello, World!', wsp].join('');

it('trims all ES5 whitespace', function () {
expect(test.trim()).toEqual('Hello, World!');
expect(test.trim().length).toBe(13);
});

it('does not trim the zero-width space', function () {
expect('\u200b'.trim()).toBe('\u200b');
expect('\u200b'.trim().length).toBe(1);
it('does not trim the next-line character', function () {
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Can you link me to which part of the spec talks about this character?

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This character is in the Unicode category Cc (Other, Control). See http://www.fileformat.info/info/unicode/char/0085/index.htm. The spec doesn't say anything about this category or this character.

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http://es5.github.io/#x7.2

ECMAScript implementations must recognize all of the white space characters defined in Unicode 3.0. Later editions of the Unicode Standard may define other white space characters. ECMAScript implementations may recognize white space characters from later editions of the Unicode Standard.

I once read through several editions of the Unicode Standard and found that U+0085 (NEL) has been in Cc ever since 1.1.5 at least, and in particular in 3.0 and all later versions, so although its purpose was a single-character replacement for \r\n, it's non-trimmable; also, as for actively trimming U+200B (ZWSP), that was in Zs before Unicode 4.0.1 (upon and after which it was in Cf), so ES5 must recognize it as trimmable (and ES6 must not): paulmillr/es6-shim#354 (comment)

(When I made that comment, I hadn't realized that even if an ES5 or ES6 implementation targets a later version of Unicode than the earliest permissible one, it must still recognize as whitespace all Zs characters from the earliest permissible version of Unicode, respectively 3.0 and 5.1.0.)

expect('\x85'.trim()).toBe('\x85');
expect('\x85'.trim().length).toBe(1);
});
});

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