Lady’s Gitweb - Gitweb/blob - static/js/lib/common-lib.js

   1 // Copyright (C) 2007, Fredrik Kuivinen <frekui@gmail.com>
   2 //               2007, Petr Baudis <pasky@suse.cz>
   3 //          2008-2011, Jakub Narebski <jnareb@gmail.com>
   4
   5 /**
   6  * @fileOverview Generic JavaScript code (helper functions)
   7  * @license GPLv2 or later
   8  */
   9
  10
  11 /* ============================================================ */
  12 /* ............................................................ */
  13 /* Padding */
  14
  15 /**
  16  * pad number N with nonbreakable spaces on the left, to WIDTH characters
  17  * example: padLeftStr(12, 3, '\u00A0') == '\u00A012'
  18  *          ('\u00A0' is nonbreakable space)
  19  *
  20  * @param {Number|String} input: number to pad
  21  * @param {Number} width: visible width of output
  22  * @param {String} str: string to prefix to string, e.g. '\u00A0'
  23  * @returns {String} INPUT prefixed with (WIDTH - INPUT.length) x STR
  24  */
  25 function padLeftStr(input, width, str) {
  26         var prefix = '';
  27
  28         width -= input.toString().length;
  29         while (width > 0) {
  30                 prefix += str;
  31                 width--;
  32         }
  33         return prefix + input;
  34 }
  35
  36 /**
  37  * Pad INPUT on the left to SIZE width, using given padding character CH,
  38  * for example padLeft('a', 3, '_') is '__a'.
  39  *
  40  * @param {String} input: input value converted to string.
  41  * @param {Number} width: desired length of output.
  42  * @param {String} ch: single character to prefix to string.
  43  *
  44  * @returns {String} Modified string, at least SIZE length.
  45  */
  46 function padLeft(input, width, ch) {
  47         var s = input + "";
  48         while (s.length < width) {
  49                 s = ch + s;
  50         }
  51         return s;
  52 }
  53
  54
  55 /* ............................................................ */
  56 /* Ajax */
  57
  58 /**
  59  * Create XMLHttpRequest object in cross-browser way
  60  * @returns XMLHttpRequest object, or null
  61  */
  62 function createRequestObject() {
  63         try {
  64                 return new XMLHttpRequest();
  65         } catch (e) {}
  66         try {
  67                 return window.createRequest();
  68         } catch (e) {}
  69         try {
  70                 return new ActiveXObject("Msxml2.XMLHTTP");
  71         } catch (e) {}
  72         try {
  73                 return new ActiveXObject("Microsoft.XMLHTTP");
  74         } catch (e) {}
  75
  76         return null;
  77 }
  78
  79
  80 /* ............................................................ */
  81 /* time and data */
  82
  83 /**
  84  * used to extract hours and minutes from timezone info, e.g '-0900'
  85  * @constant
  86  */
  87 var tzRe = /^([+-])([0-9][0-9])([0-9][0-9])$/;
  88
  89 /**
  90  * convert numeric timezone +/-ZZZZ to offset from UTC in seconds
  91  *
  92  * @param {String} timezoneInfo: numeric timezone '(+|-)HHMM'
  93  * @returns {Number} offset from UTC in seconds for timezone
  94  *
  95  * @globals tzRe
  96  */
  97 function timezoneOffset(timezoneInfo) {
  98         var match = tzRe.exec(timezoneInfo);
  99         var tz_sign = (match[1] === '-' ? -1 : +1);
 100         var tz_hour = parseInt(match[2],10);
 101         var tz_min  = parseInt(match[3],10);
 102
 103         return tz_sign*(((tz_hour*60) + tz_min)*60);
 104 }
 105
 106 /**
 107  * return date in local time formatted in iso-8601 like format
 108  * 'yyyy-mm-dd HH:MM:SS +/-ZZZZ' e.g. '2005-08-07 21:49:46 +0200'
 109  *
 110  * @param {Number} epoch: seconds since '00:00:00 1970-01-01 UTC'
 111  * @param {String} timezoneInfo: numeric timezone '(+|-)HHMM'
 112  * @returns {String} date in local time in iso-8601 like format
 113  */
 114 function formatDateISOLocal(epoch, timezoneInfo) {
 115         // date corrected by timezone
 116         var localDate = new Date(1000 * (epoch +
 117                 timezoneOffset(timezoneInfo)));
 118         var localDateStr = // e.g. '2005-08-07'
 119                 localDate.getUTCFullYear()                 + '-' +
 120                 padLeft(localDate.getUTCMonth()+1, 2, '0') + '-' +
 121                 padLeft(localDate.getUTCDate(),    2, '0');
 122         var localTimeStr = // e.g. '21:49:46'
 123                 padLeft(localDate.getUTCHours(),   2, '0') + ':' +
 124                 padLeft(localDate.getUTCMinutes(), 2, '0') + ':' +
 125                 padLeft(localDate.getUTCSeconds(), 2, '0');
 126
 127         return localDateStr + ' ' + localTimeStr + ' ' + timezoneInfo;
 128 }
 129
 130
 131 /* ............................................................ */
 132 /* unquoting/unescaping filenames */
 133
 134 /**#@+
 135  * @constant
 136  */
 137 var escCodeRe = /\\([^0-7]|[0-7]{1,3})/g;
 138 var octEscRe = /^[0-7]{1,3}$/;
 139 var maybeQuotedRe = /^\"(.*)\"$/;
 140 /**#@-*/
 141
 142 /**
 143  * unquote maybe git-quoted filename
 144  * e.g. 'aa' -> 'aa', '"a\ta"' -> 'a    a'
 145  *
 146  * @param {String} str: git-quoted string
 147  * @returns {String} Unquoted and unescaped string
 148  *
 149  * @globals escCodeRe, octEscRe, maybeQuotedRe
 150  */
 151 function unquote(str) {
 152         function unq(seq) {
 153                 var es = {
 154                         // character escape codes, aka escape sequences (from C)
 155                         // replacements are to some extent JavaScript specific
 156                         t: "\t",   // tab            (HT, TAB)
 157                         n: "\n",   // newline        (NL)
 158                         r: "\r",   // return         (CR)
 159                         f: "\f",   // form feed      (FF)
 160                         b: "\b",   // backspace      (BS)
 161                         a: "\x07", // alarm (bell)   (BEL)
 162                         e: "\x1B", // escape         (ESC)
 163                         v: "\v"    // vertical tab   (VT)
 164                 };
 165
 166                 if (seq.search(octEscRe) !== -1) {
 167                         // octal char sequence
 168                         return String.fromCharCode(parseInt(seq, 8));
 169                 } else if (seq in es) {
 170                         // C escape sequence, aka character escape code
 171                         return es[seq];
 172                 }
 173                 // quoted ordinary character
 174                 return seq;
 175         }
 176
 177         var match = str.match(maybeQuotedRe);
 178         if (match) {
 179                 str = match[1];
 180                 // perhaps str = eval('"'+str+'"'); would be enough?
 181                 str = str.replace(escCodeRe,
 182                         function (substr, p1, offset, s) { return unq(p1); });
 183         }
 184         return str;
 185 }
 186
 187 /* end of common-lib.js */