// Copyright (C) 2007, Fredrik Kuivinen <frekui@gmail.com>
// 2007, Petr Baudis <pasky@suse.cz>
// 2008-2011, Jakub Narebski <jnareb@gmail.com>
/**
* @fileOverview Generic JavaScript code (helper functions)
* @license GPLv2 or later
*/
/* ============================================================ */
/* ............................................................ */
/* Padding */
/**
* pad INPUT on the left with STR that is assumed to have visible
* width of single character (for example nonbreakable spaces),
* to WIDTH characters
*
* example: padLeftStr(12, 3, '\u00A0') == '\u00A012'
* ('\u00A0' is nonbreakable space)
*
* @param {Number|String} input: number to pad
* @param {Number} width: visible width of output
* @param {String} str: string to prefix to string, defaults to '\u00A0'
* @returns {String} INPUT prefixed with STR x (WIDTH - INPUT.length)
*/
function padLeftStr(input, width, str) {
var prefix = '';
if (typeof str === 'undefined') {
ch = '\u00A0'; // using ' ' doesn't work in all browsers
}
width -= input.toString().length;
while (width > 0) {
prefix += str;
width--;
}
return prefix + input;
}
/**
* Pad INPUT on the left to WIDTH, using given padding character CH,
* for example padLeft('a', 3, '_') is '__a'
* padLeft(4, 2) is '04' (same as padLeft(4, 2, '0'))
*
* @param {String} input: input value converted to string.
* @param {Number} width: desired length of output.
* @param {String} ch: single character to prefix to string, defaults to '0'.
*
* @returns {String} Modified string, at least SIZE length.
*/
function padLeft(input, width, ch) {
var s = input + "";
if (typeof ch === 'undefined') {
ch = '0';
}
while (s.length < width) {
s = ch + s;
}
return s;
}
/* ............................................................ */
/* Handling browser incompatibilities */
/**
* Create XMLHttpRequest object in cross-browser way
* @returns XMLHttpRequest object, or null
*/
function createRequestObject() {
try {
return new XMLHttpRequest();
} catch (e) {}
try {
return window.createRequest();
} catch (e) {}
try {
return new ActiveXObject("Msxml2.XMLHTTP");
} catch (e) {}
try {
return new ActiveXObject("Microsoft.XMLHTTP");
} catch (e) {}
return null;
}
/**
* Insert rule giving specified STYLE to given SELECTOR at the end of
* first CSS stylesheet.
*
* @param {String} selector: CSS selector, e.g. '.class'
* @param {String} style: rule contents, e.g. 'background-color: red;'
*/
function addCssRule(selector, style) {
var stylesheet = document.styleSheets[0];
var theRules = [];
if (stylesheet.cssRules) { // W3C way
theRules = stylesheet.cssRules;
} else if (stylesheet.rules) { // IE way
theRules = stylesheet.rules;
}
if (stylesheet.insertRule) { // W3C way
stylesheet.insertRule(selector + ' { ' + style + ' }', theRules.length);
} else if (stylesheet.addRule) { // IE way
stylesheet.addRule(selector, style);
}
}
/* ............................................................ */
/* Support for legacy browsers */
/**
* Provides getElementsByClassName method, if there is no native
* implementation of this method.
*
* NOTE that there are limits and differences compared to native
* getElementsByClassName as defined by e.g.:
* https://developer.mozilla.org/en/DOM/document.getElementsByClassName
* http://www.whatwg.org/specs/web-apps/current-work/multipage/dom.html#dom-getelementsbyclassname
* http://www.whatwg.org/specs/web-apps/current-work/multipage/dom.html#dom-document-getelementsbyclassname
*
* Namely, this implementation supports only single class name as
* argument and not set of space-separated tokens representing classes,
* it returns Array of nodes rather than live NodeList, and has
* additional optional argument where you can limit search to given tags
* (via getElementsByTagName).
*
* Based on
* http://code.google.com/p/getelementsbyclassname/
* http://www.dustindiaz.com/getelementsbyclass/
* http://stackoverflow.com/questions/1818865/do-we-have-getelementsbyclassname-in-javascript
*
* See also http://ejohn.org/blog/getelementsbyclassname-speed-comparison/
*
* @param {String} class: name of _single_ class to find
* @param {String} [taghint] limit search to given tags
* @returns {Node[]} array of matching elements
*/
if (!('getElementsByClassName' in document)) {
document.getElementsByClassName = function (classname, taghint) {
taghint = taghint || "*";
var elements = (taghint === "*" && document.all) ?
document.all :
document.getElementsByTagName(taghint);
var pattern = new RegExp("(^|\\s)" + classname + "(\\s|$)");
var matches= [];
for (var i = 0, j = 0, n = elements.length; i < n; i++) {
var el= elements[i];
if (el.className && pattern.test(el.className)) {
// matches.push(el);
matches[j] = el;
j++;
}
}
return matches;
};
} // end if
/* ............................................................ */
/* unquoting/unescaping filenames */
/**#@+
* @constant
*/
var escCodeRe = /\\([^0-7]|[0-7]{1,3})/g;
var octEscRe = /^[0-7]{1,3}$/;
var maybeQuotedRe = /^\"(.*)\"$/;
/**#@-*/
/**
* unquote maybe C-quoted filename (as used by git, i.e. it is
* in double quotes '"' if there is any escape character used)
* e.g. 'aa' -> 'aa', '"a\ta"' -> 'a a'
*
* @param {String} str: git-quoted string
* @returns {String} Unquoted and unescaped string
*
* @globals escCodeRe, octEscRe, maybeQuotedRe
*/
function unquote(str) {
function unq(seq) {
var es = {
// character escape codes, aka escape sequences (from C)
// replacements are to some extent JavaScript specific
t: "\t", // tab (HT, TAB)
n: "\n", // newline (NL)
r: "\r", // return (CR)
f: "\f", // form feed (FF)
b: "\b", // backspace (BS)
a: "\x07", // alarm (bell) (BEL)
e: "\x1B", // escape (ESC)
v: "\v" // vertical tab (VT)
};
if (seq.search(octEscRe) !== -1) {
// octal char sequence
return String.fromCharCode(parseInt(seq, 8));
} else if (seq in es) {
// C escape sequence, aka character escape code
return es[seq];
}
// quoted ordinary character
return seq;
}
var match = str.match(maybeQuotedRe);
if (match) {
str = match[1];
// perhaps str = eval('"'+str+'"'); would be enough?
str = str.replace(escCodeRe,
function (substr, p1, offset, s) { return unq(p1); });
}
return str;
}
/* end of common-lib.js */
