зеркало из https://github.com/mozilla/pjs.git
206 строки
8.2 KiB
JavaScript
206 строки
8.2 KiB
JavaScript
/* The contents of this file are subject to the Netscape Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is Mozilla Communicator client code, released March
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* 31, 1998.
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*
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* The Initial Developer of the Original Code is Netscape Communications
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* Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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*
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*/
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/**
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File Name: 15.5.4.8-3.js
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ECMA Section: 15.5.4.8 String.prototype.split( separator )
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Description:
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Returns an Array object into which substrings of the result of converting
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this object to a string have been stored. The substrings are determined by
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searching from left to right for occurrences of the given separator; these
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occurrences are not part of any substring in the returned array, but serve
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to divide up this string value. The separator may be a string of any length.
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As a special case, if the separator is the empty string, the string is split
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up into individual characters; the length of the result array equals the
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length of the string, and each substring contains one character.
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If the separator is not supplied, then the result array contains just one
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string, which is the string.
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When the split method is called with one argument separator, the following steps are taken:
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1. Call ToString, giving it the this value as its argument.
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2. Create a new Array object of length 0 and call it A.
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3. If separator is not supplied, call the [[Put]] method of A with 0 and
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Result(1) as arguments, and then return A.
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4. Call ToString(separator).
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5. Compute the number of characters in Result(1).
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6. Compute the number of characters in the string that is Result(4).
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7. Let p be 0.
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8. If Result(6) is zero (the separator string is empty), go to step 17.
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9. Compute the smallest possible integer k not smaller than p such that
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k+Result(6) is not greater than Result(5), and for all nonnegative
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integers j less than Result(6), the character at position k+j of
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Result(1) is the same as the character at position j of Result(2);
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but if there is no such integer k, then go to step 14.
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10. Compute a string value equal to the substring of Result(1), consisting
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of the characters at positions p through k1, inclusive.
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11. Call the [[Put]] method of A with A.length and Result(10) as arguments.
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12. Let p be k+Result(6).
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13. Go to step 9.
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14. Compute a string value equal to the substring of Result(1), consisting
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of the characters from position p to the end of Result(1).
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15. Call the [[Put]] method of A with A.length and Result(14) as arguments.
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16. Return A.
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17. If p equals Result(5), return A.
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18. Compute a string value equal to the substring of Result(1), consisting of
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the single character at position p.
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19. Call the [[Put]] method of A with A.length and Result(18) as arguments.
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20. Increase p by 1.
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21. Go to step 17.
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Note that the split function is intentionally generic; it does not require that its this value be a String
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object. Therefore it can be transferred to other kinds of objects for use as a method.
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Author: christine@netscape.com
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Date: 12 november 1997
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*/
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var SECTION = "15.5.4.8-3";
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var VERSION = "ECMA_1";
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startTest();
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var TITLE = "String.prototype.split";
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writeHeaderToLog( SECTION + " "+ TITLE);
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var testcases = getTestCases();
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test();
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function getTestCases() {
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var array = new Array();
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var item = 0;
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var TEST_STRING = "";
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var EXPECT = new Array();
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// this.toString is the empty string.
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array[item++] = new TestCase( SECTION,
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"var s = new String(); s.split().length",
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1,
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eval("var s = new String(); s.split().length") );
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array[item++] = new TestCase( SECTION,
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"var s = new String(); s.split()[0]",
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"",
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eval("var s = new String(); s.split()[0]") );
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// this.toString() is the empty string, separator is specified.
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array[item++] = new TestCase( SECTION,
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"var s = new String(); s.split('').length",
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0,
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eval("var s = new String(); s.split('').length") );
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array[item++] = new TestCase( SECTION,
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"var s = new String(); s.split(' ').length",
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1,
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eval("var s = new String(); s.split(' ').length") );
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// this to string is " "
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array[item++] = new TestCase( SECTION,
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"var s = new String(' '); s.split().length",
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1,
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eval("var s = new String(' '); s.split().length") );
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array[item++] = new TestCase( SECTION,
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"var s = new String(' '); s.split()[0]",
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" ",
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eval("var s = new String(' '); s.split()[0]") );
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array[item++] = new TestCase( SECTION,
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"var s = new String(' '); s.split('').length",
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1,
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eval("var s = new String(' '); s.split('').length") );
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array[item++] = new TestCase( SECTION,
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"var s = new String(' '); s.split('')[0]",
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" ",
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eval("var s = new String(' '); s.split('')[0]") );
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array[item++] = new TestCase( SECTION,
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"var s = new String(' '); s.split(' ').length",
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2,
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eval("var s = new String(' '); s.split(' ').length") );
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array[item++] = new TestCase( SECTION,
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"var s = new String(' '); s.split(' ')[0]",
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"",
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eval("var s = new String(' '); s.split(' ')[0]") );
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array[item++] = new TestCase( SECTION,
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"\"\".split(\"\").length",
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0,
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("".split("")).length );
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array[item++] = new TestCase( SECTION,
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"\"\".split(\"x\").length",
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1,
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("".split("x")).length );
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array[item++] = new TestCase( SECTION,
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"\"\".split(\"x\")[0]",
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"",
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("".split("x"))[0] );
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return array;
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}
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function test() {
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for ( tc=0; tc < testcases.length; tc++ ) {
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testcases[tc].passed = writeTestCaseResult(
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testcases[tc].expect,
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testcases[tc].actual,
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testcases[tc].description +" = "+
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testcases[tc].actual );
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testcases[tc].reason += ( testcases[tc].passed ) ? "" : "wrong value ";
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}
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stopTest();
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return ( testcases );
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}
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function Split( string, separator ) {
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string = String( string );
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var A = new Array();
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if ( arguments.length < 2 ) {
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A[0] = string;
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return A;
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}
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separator = String( separator );
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var str_len = String( string ).length;
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var sep_len = String( separator ).length;
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var p = 0;
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var k = 0;
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if ( sep_len == 0 ) {
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for ( ; p < str_len; p++ ) {
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A[A.length] = String( string.charAt(p) );
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}
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}
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return A;
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}
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