The Tor Browser: services/sync/tps/extensions/mozmill/resource/stdlib/withs.js@4ab42b5ab56c

     1 /*

     2     Copyright (c) 2006 Lawrence Oluyede <l.oluyede@gmail.com>

     4     Permission is hereby granted, free of charge, to any person obtaining a copy

     5     of this software and associated documentation files (the "Software"), to deal

     6     in the Software without restriction, including without limitation the rights

     7     to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

     8     copies of the Software, and to permit persons to whom the Software is

     9     furnished to do so, subject to the following conditions:

    11     The above copyright notice and this permission notice shall be included in all

    12     copies or substantial portions of the Software.

    14     THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

    15     IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

    16     FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

    17     AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

    18     LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

    19     OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE

    20     SOFTWARE.

    21 */

    23 /*

    24  startsWith(str, prefix[, start[, end]]) -> bool

    26  Return true if str ends with the specified prefix, false otherwise.

    27  With optional start, test str beginning at that position.

    28  With optional end, stop comparing str at that position.

    29  prefix can also be an array of strings to try.

    30 */

    32 var EXPORTED_SYMBOLS = ['startsWith', 'endsWith'];

    34 function startsWith(str, prefix, start, end) {

    35     if (arguments.length < 2) {

    36         throw new TypeError('startsWith() requires at least 2 arguments');

    37     }

    39     // check if start and end are null/undefined or a 'number'

    40     if ((start == null) || (isNaN(new Number(start)))) {

    41         start = 0;

    42     }

    43     if ((end == null) || (isNaN(new Number(end)))) {

    44         end = Number.MAX_VALUE;

    45     }

    47     // if it's an array

    48     if (typeof prefix == "object") {

    49         for (var i = 0, j = prefix.length; i < j; i++) {

    50             var res = _stringTailMatch(str, prefix[i], start, end, true);

    51             if (res) {

    52                 return true;

    53             }

    54         }

    55         return false;

    56     }

    58     return _stringTailMatch(str, prefix, start, end, true);

    59 }

    61 /*

    62  endsWith(str, suffix[, start[, end]]) -> bool

    64  Return true if str ends with the specified suffix, false otherwise.

    65  With optional start, test str beginning at that position.

    66  With optional end, stop comparing str at that position.

    67  suffix can also be an array of strings to try.

    68 */

    69 function endsWith(str, suffix, start, end) {

    70     if (arguments.length < 2) {

    71         throw new TypeError('endsWith() requires at least 2 arguments');

    72     }

    74     // check if start and end are null/undefined or a 'number'

    75     if ((start == null) || (isNaN(new Number(start)))) {

    76         start = 0;

    77     }

    78     if ((end == null) || (isNaN(new Number(end)))) {

    79         end = Number.MAX_VALUE;

    80     }

    82     // if it's an array

    83     if (typeof suffix == "object") {

    84         for (var i = 0, j = suffix.length; i < j; i++) {

    85             var res = _stringTailMatch(str, suffix[i], start, end, false);

    86             if (res) {

    87                 return true;

    88             }

    89         }

    90         return false;

    91     }

    93     return _stringTailMatch(str, suffix, start, end, false);

    94 }

    96 /*

    97  Matches the end (direction == false) or start (direction == true) of str

    98  against substr, using the start and end arguments. Returns false

    99  if not found and true if found.

   100 */

   101 function _stringTailMatch(str, substr, start, end, fromStart) {

   102     var len = str.length;

   103     var slen = substr.length;

   105     var indices = _adjustIndices(start, end, len);

   106     start = indices[0]; end = indices[1]; len = indices[2];

   108     if (fromStart) {

   109         if (start + slen > len) {

   110             return false;

   111         }

   112     } else {

   113         if (end - start < slen || start > len) {

   114             return false;

   115         }

   116         if (end - slen > start) {

   117             start = end - slen;

   118         }

   119     }

   121     if (end - start >= slen) {

   122         return str.substr(start, slen) == substr;

   123     }

   124     return false;

   125 }

   127 function _adjustIndices(start, end, len)

   128 {

   129 	if (end > len) {

   130 	    end = len;

   131 	} else if (end < 0) {

   132 	    end += len;

   133 	}

   135     if (end < 0) {

   136         end = 0;

   137     }

   138 	if (start < 0) {

   139 	    start += len;

   140 	}

   141 	if (start < 0) {

   142 		start = 0;

   143 	}

   145 	return [start, end, len];

   146 }

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