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Rhino is an open-source implementation of JavaScript written entirely in Java. It is typically embedded into Java applications to provide scripting to end users.
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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

gTestfile = 'split-002.js';

/**
 *  File Name:          String/split-002.js
 *  ECMA Section:       15.6.4.9
 *  Description:        Based on ECMA 2 Draft 7 February 1999
 *
 *  Author:             [email protected]
 *  Date:               19 February 1999
 */

/*
 * Since regular expressions have been part of JavaScript since 1.2, there
 * are already tests for regular expressions in the js1_2/regexp folder.
 *
 * These new tests try to supplement the existing tests, and verify that
 * our implementation of RegExp conforms to the ECMA specification, but
 * does not try to be as exhaustive as in previous tests.
 *
 * The [,limit] argument to String.split is new, and not covered in any
 * existing tests.
 *
 * String.split cases are covered in ecma/String/15.5.4.8-*.js.
 * String.split where separator is a RegExp are in
 * js1_2/regexp/string_split.js
 *
 */

var SECTION = "ecma_2/String/split-002.js";
var VERSION = "ECMA_2";
var TITLE   = "String.prototype.split( regexp, [,limit] )";

startTest();

// the separator is not supplied
// separator is undefined
// separator is an empty string

//    AddSplitCases( "splitme", "", "''", ["s", "p", "l", "i", "t", "m", "e"] );
//    AddSplitCases( "splitme", new RegExp(), "new RegExp()", ["s", "p", "l", "i", "t", "m", "e"] );

// separator is an empty regexp
// separator is not supplied

CompareSplit( "hello", "ll" );

CompareSplit( "hello", "l" );
CompareSplit( "hello", "x" );
CompareSplit( "hello", "h" );
CompareSplit( "hello", "o" );
CompareSplit( "hello", "hello" );
CompareSplit( "hello", undefined );

CompareSplit( "hello", "");
CompareSplit( "hello", "hellothere" );

CompareSplit( new String("hello" ) );


Number.prototype.split = String.prototype.split;

CompareSplit( new Number(100111122133144155), 1 );
CompareSplitWithLimit(new Number(100111122133144155), 1, 1 );

CompareSplitWithLimit(new Number(100111122133144155), 1, 2 );
CompareSplitWithLimit(new Number(100111122133144155), 1, 0 );
CompareSplitWithLimit(new Number(100111122133144155), 1, 100 );
CompareSplitWithLimit(new Number(100111122133144155), 1, void 0 );
CompareSplitWithLimit(new Number(100111122133144155), 1, Math.pow(2,32)-1 );
CompareSplitWithLimit(new Number(100111122133144155), 1, "boo" );
CompareSplitWithLimit(new Number(100111122133144155), 1, -(Math.pow(2,32)-1) );
CompareSplitWithLimit( "hello", "l", NaN );
CompareSplitWithLimit( "hello", "l", 0 );
CompareSplitWithLimit( "hello", "l", 1 );
CompareSplitWithLimit( "hello", "l", 2 );
CompareSplitWithLimit( "hello", "l", 3 );
CompareSplitWithLimit( "hello", "l", 4 );


/*
  CompareSplitWithLimit( "hello", "ll", 0 );
  CompareSplitWithLimit( "hello", "ll", 1 );
  CompareSplitWithLimit( "hello", "ll", 2 );
  CompareSplit( "", " " );
  CompareSplit( "" );
*/

// separartor is a regexp
// separator regexp value global setting is set
// string is an empty string
// if separator is an empty string, split each by character

// this is not a String object

// limit is not a number
// limit is undefined
// limit is larger than 2^32-1
// limit is a negative number

test();

function CompareSplit( string, separator ) {
  split_1 = string.split( separator );
  split_2 = string_split( string, separator );

  AddTestCase(
    "( " + string +".split(" + separator + ") ).length" ,
    split_2.length,
    split_1.length );

  var limit = split_1.length > split_2.length ?
    split_1.length : split_2.length;

  for ( var split_item = 0; split_item < limit; split_item++ ) {
    AddTestCase(
      string + ".split(" + separator + ")["+split_item+"]",
      split_2[split_item],
      split_1[split_item] );
  }
}

function CompareSplitWithLimit( string, separator, splitlimit ) {
  split_1 = string.split( separator, splitlimit );
  split_2 = string_split( string, separator, splitlimit );

  AddTestCase(
    "( " + string +".split(" + separator + ", " + splitlimit+") ).length" ,
    split_2.length,
    split_1.length );

  var limit = split_1.length > split_2.length ?
    split_1.length : split_2.length;

  for ( var split_item = 0; split_item < limit; split_item++ ) {
    AddTestCase(
      string + ".split(" + separator  + ", " + splitlimit+")["+split_item+"]",
      split_2[split_item],
      split_1[split_item] );
  }
}

function string_split ( __this, separator, limit ) {
  var S = String(__this );					  // 1

  var A = new Array();                          // 2

  if ( limit == undefined ) {                   // 3
    lim = Math.pow(2, 31 ) -1;
  } else {
    lim = ToUint32( limit );
  }

  var s = S.length;                              // 4
  var p = 0;                                     // 5

  if  ( separator == undefined ) {              // 8
    A[0] = S;
    return A;
  }

  if ( separator.constructor == RegExp )         // 6
    R = separator;
  else
    R = separator.toString();

  if (lim == 0) return A;                       // 7

  if  ( separator == undefined ) {              // 8
    A[0] = S;
    return A;
  }

  if (s == 0) {		                          // 9
    z = SplitMatch(R, S, 0);
    if (z != false) return A;
    A[0] = S;
    return A;
  }

  var q = p;									  // 10
loop:
  while (true ) {
	
    if ( q == s ) break;					  // 11

    z = SplitMatch(R, S, q);                  // 12

//print("Returned ", z);

    if (z != false) {							// 13
      e = z.endIndex;							// 14
      cap = z.captures;						// 14
      if (e != p) {							// 15
//print("S = ", S, ", p = ", p, ", q = ", q);
	T = S.slice(p, q);					// 16
//print("T = ", T);
	A[A.length] = T;					// 17
	if (A.length == lim) return A;		// 18
	p = e;								// 19
	i = 0;								// 20
	while (true) {						// 25
	  if (i == cap.length) {              // 21
	    q = p;                          // 10
	    continue loop;
	  }
	  i = i + 1;							// 22
	  A[A.length] = cap[i]				// 23
	    if (A.length == lim) return A;		// 24
	}
      }
    }

    q = q + 1;                               // 26
  }

  T = S.slice(p, q);
  A[A.length] = T;
  return A;
}

function SplitMatch(R, S, q)
{
  if (R.constructor == RegExp) {			// 1
    var reResult = R.match(S, q);		// 8
    if (reResult == undefined)
      return false;
    else {
      a = new Array(reResult.length - 1);
      for (var i = 1; i < reResult.length; i++)
	a[a.length] = reResult[i];
      return { endIndex : reResult.index + reResult[0].length, captures : cap };
    }
  }
  else {
    var r = R.length;					// 2
    s = S.length;						// 3
    if ((q + r) > s) return false;		// 4
    for (var i = 0; i < r; i++) {
//print("S.charAt(", q + i, ") = ", S.charAt(q + i), ", R.charAt(", i, ") = ", R.charAt(i));
      if (S.charAt(q + i) != R.charAt(i))			// 5
	return false;
    }
    cap = new Array();								// 6
    return { endIndex : q + r, captures : cap };	// 7
  }
}

function ToUint32( n ) {
  n = Number( n );
  var sign = ( n < 0 ) ? -1 : 1;

  if ( Math.abs( n ) == 0
       || Math.abs( n ) == Number.POSITIVE_INFINITY
       || n != n) {
    return 0;
  }
  n = sign * Math.floor( Math.abs(n) )

    n = n % Math.pow(2,32);

  if ( n < 0 ){
    n += Math.pow(2,32);
  }

  return ( n );
}