Add trim, trimLeft and trimRight methods to String

test/mjsunit/third_party/string-trim.js

+// Copyright (c) 2009 Apple Computer, Inc. All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions
+// are met:
+//
+// 1. Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//
+// 2. Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following
+// disclaimer in the documentation and/or other materials provided
+// with the distribution.
+//
+// 3. Neither the name of the copyright holder(s) nor the names of any
+// contributors may be used to endorse or promote products derived
+// from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+// COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+// OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Based on LayoutTests/fast/js/script-tests/string-trim.js
+
+// References to trim(), trimLeft() and trimRight() functions for 
+// testing Function's *.call() and *.apply() methods.
+
+var trim            = String.prototype.trim;
+var trimLeft        = String.prototype.trimLeft;
+var trimRight       = String.prototype.trimRight;
+
+var testString      = 'foo bar';
+var trimString      = '';
+var leftTrimString  = '';
+var rightTrimString = '';
+var wsString        = '';
+
+var whitespace      = [
+  {s : '\u0009', t : 'HORIZONTAL TAB'},
+  {s : '\u000A', t : 'LINE FEED OR NEW LINE'},
+  {s : '\u000B', t : 'VERTICAL TAB'},
+  {s : '\u000C', t : 'FORMFEED'},
+  {s : '\u000D', t : 'CARRIAGE RETURN'},
+  {s : '\u0020', t : 'SPACE'},
+  {s : '\u00A0', t : 'NO-BREAK SPACE'},
+  {s : '\u2000', t : 'EN QUAD'},
+  {s : '\u2001', t : 'EM QUAD'},
+  {s : '\u2002', t : 'EN SPACE'},
+  {s : '\u2003', t : 'EM SPACE'},
+  {s : '\u2004', t : 'THREE-PER-EM SPACE'},
+  {s : '\u2005', t : 'FOUR-PER-EM SPACE'},
+  {s : '\u2006', t : 'SIX-PER-EM SPACE'},
+  {s : '\u2007', t : 'FIGURE SPACE'},
+  {s : '\u2008', t : 'PUNCTUATION SPACE'},
+  {s : '\u2009', t : 'THIN SPACE'},
+  {s : '\u200A', t : 'HAIR SPACE'},
+  {s : '\u3000', t : 'IDEOGRAPHIC SPACE'},
+  {s : '\u2028', t : 'LINE SEPARATOR'},
+  {s : '\u2029', t : 'PARAGRAPH SEPARATOR'},
+  {s : '\u200B', t : 'ZERO WIDTH SPACE (category Cf)'}
+];
+
+for (var i = 0; i < whitespace.length; i++) {
+  assertEquals(whitespace[i].s.trim(), '');
+  assertEquals(whitespace[i].s.trimLeft(), '');
+  assertEquals(whitespace[i].s.trimRight(), '');
+  wsString += whitespace[i].s;
+}
+
+trimString      = wsString   + testString + wsString;
+leftTrimString  = testString + wsString;   // Trimmed from the left.
+rightTrimString = wsString   + testString; // Trimmed from the right.

[Erik Corry, 2009/10/13 08:27:44]

You 'need' an extra space immediately preceding the double slash (//) here.

+
+assertEquals(wsString.trim(),      '');
+assertEquals(wsString.trimLeft(),  '');
+assertEquals(wsString.trimRight(), '');
+
+assertEquals(trimString.trim(),      testString);
+assertEquals(trimString.trimLeft(),  leftTrimString);
+assertEquals(trimString.trimRight(), rightTrimString);
+
+assertEquals(leftTrimString.trim(),      testString);
+assertEquals(leftTrimString.trimLeft(),  leftTrimString);
+assertEquals(leftTrimString.trimRight(), testString);
+
+assertEquals(rightTrimString.trim(),      testString);
+assertEquals(rightTrimString.trimLeft(),  testString);
+assertEquals(rightTrimString.trimRight(), rightTrimString);
+
+var testValues = [0, Infinity, NaN, true, false, ({}), ['an','array']

[Erik Corry, 2009/10/13 08:27:44]

Is there a missing comma at the end of this line?  I can't quite parse this, but
perhaps the machine can :-).

+  ({toString:function(){return 'wibble'}})
+];
+
+for (var i = 0; i < testValues.length; i++) {
+  assertEquals(trim.call(testValues[i]), String(testValues[i]));
+  assertEquals(trimLeft.call(testValues[i]), String(testValues[i]));
+  assertEquals(trimRight.call(testValues[i]), String(testValues[i]));
+}