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Edit File: 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
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// 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.

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'],
  ({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]));
}

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