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qwery.js
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qwery.js
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/*!
* qwery.js - copyright @dedfat
* original inspiration: http://simonwillison.net/2003/Mar/25/getElementsBySelector/
* https://github.com/polvero/qwery
* Follow our software http://twitter.com/dedfat
* MIT License
*/
!function (context, doc) {
function array(ar) {
return Array.prototype.slice.call(ar, 0);
}
function getAllChildren(e) {
return e.all ? e.all : e.getElementsByTagName('*');
}
// function iter(obj) {
// this.obj = array(obj);
// }
//
// iter.prototype = {
// each: function (fn) {
// for (var i = 0; i < this.obj.length; i ++) {
// fn.call(this.obj[i], this.obj[i], i, this.obj);
// }
// return this;
// },
//
// map: function (fn) {
// var collection = [];
// for (var i = 0; i < this.obj.length; i ++) {
// collection[i] = fn.call(this.obj[i], this.obj[i], i, this.obj);
// }
// return collection;
// }
// };
//
// function _(obj) {
// return new iter(obj);
// }
var checkFunctions = {
'=': function (e, attrName, attrValue) {
return (e.getAttribute(attrName) == attrValue);
},
'~': function (e, attrName, attrValue) {
return (e.getAttribute(attrName).match(new RegExp('\\b' + attrValue + '\\b')));
},
'|': function (e, attrName, attrValue) {
return (e.getAttribute(attrName).match(new RegExp('^' + attrValue + '-?')));
},
'^': function (e, attrName, attrValue) {
return (e.getAttribute(attrName).indexOf(attrValue) === 0);
},
'$': function (e, attrName, attrValue) {
return (e.getAttribute(attrName).lastIndexOf(attrValue) == e.getAttribute(attrName).length - attrValue.length);
},
'*': function (e, attrName, attrValue) {
return (e.getAttribute(attrName).indexOf(attrValue) > -1);
},
'': function (e, attrName) {
return e.getAttribute(attrName);
}
};
// needle is possible descendent
// haystack is possible ancestor
function isAncestor(needle, haystack) {
if (!haystack || !needle) {
return false;
}
if (haystack.contains && needle.nodeType) {
return haystack.contains(needle);
}
else if (haystack.compareDocumentPosition && needle.nodeType) {
return !!(haystack.compareDocumentPosition(needle) & 16);
} else if (needle.nodeType) {
return false;
}
return false;
}
function _qwery(selector, root) {
var tokens = selector.split(' '), bits, tagName, h, i, j, k, l, len,
found, foundCount, elements, currentContextIndex, currentContext = [doc];
for (i = 0, l = tokens.length; i < l; i++) {
token = tokens[i].replace(/^\s+|\s+$/g, '');
if (token.indexOf('#') > -1) {
bits = token.split('#');
tagName = bits[0];
var element = doc.getElementById(bits[1]);
if (tagName && element.nodeName.toLowerCase() != tagName) {
return [];
}
currentContext = [element];
continue;
}
if (token.indexOf('.') > -1) {
// Token contains a class selector
bits = token.split('.');
tagName = bits[foundCount = 0];
tagName = tagName || '*';
found = [];
for (h = 0, len = currentContext.length; h < len; h++) {
elements = tagName == '*' ? getAllChildren(currentContext[h]) : currentContext[h].getElementsByTagName(tagName);
for (j = 0, k = elements.length; j < k; j++) {
found[foundCount++] = elements[j];
}
}
currentContext = [];
currentContextIndex = 0;
for (k = 0, len = found.length; k < len; k++) {
if (found[k].className && found[k].className.match(new RegExp('(?:^|\\s+)' + bits[1] + '(?:\\s+|$)'))) {
currentContext[currentContextIndex++] = found[k];
}
}
continue;
}
// Code to deal with attribute selectors
if (token.match(/^(\w*)\[(\w+)([=~\|\^\$\*]?)=?"?([^\]"]*)"?\]$/)) {
tagName = RegExp.$1;
var attrName = RegExp.$2;
var attrOperator = RegExp.$3;
var attrValue = RegExp.$4;
if (!tagName) {
tagName = '*';
}
// Grab all of the tagName elements within current context
found = [];
foundCount = 0;
for (h = 0; h < currentContext.length; h++) {
if (tagName == '*') {
elements = getAllChildren(currentContext[h]);
} else {
elements = currentContext[h].getElementsByTagName(tagName);
}
for (j = 0; j < elements.length; j++) {
found[foundCount++] = elements[j];
}
}
currentContext = [];
currentContextIndex = 0;
// This function will be used to filter the elements
var checkFunction = checkFunctions[attrOperator] || checkFunctions[''];
for (k = 0; k < found.length; k++) {
if (checkFunction(found[k], attrName, attrValue)) {
currentContext[currentContextIndex++] = found[k];
}
}
continue; // Skip to next token
}
// If we get here, token is JUST an element (not a class or ID selector)
tagName = token;
found = [];
foundCount = 0;
for (h = 0; h < currentContext.length; h++) {
elements = currentContext[h].getElementsByTagName(tagName);
for (j = 0; j < elements.length; j++) {
found[foundCount++] = elements[j];
}
}
currentContext = found;
}
return currentContext;
}
function qwery(selector, root) {
if (!doc.getElementsByTagName) {
return [];
}
root = root || document;
if (doc.querySelectorAll) {
// return immediately for browsers that know what they're doing
// method suggested by Mozilla https://developer.mozilla.org/En/Code_snippets/QuerySelector
return array(root.querySelectorAll(selector), 0);
}
// these next two operations could really benefit from an accumulator (eg: map/each/accumulate)
var result = [];
// here we allow combinator selectors: $('div,span');
// var collections = _(selector.split(',')).map(function (selector) {
// return _qwery(selector, root);
// });
var collections = [];
var selectors = selector.split(',');
for (var i = 0, j = selectors.length; i < j; i++) {
collections.push(_qwery(selectors[i], root));
}
// _(collections).each(function (collection) {
// var ret = collection;
// // allow contexts
// if (root !== document) {
// ret = [];
// _(collection).each(function (element) {
// // make sure element is a descendent of root
// isAncestor(element, root) && ret.push(element);
// });
// }
for (var m = 0, n = collections.length; m < n; m++) {
var ret = collections[m];
if (root !== document) {
ret = [];
for (var y = 0, z = collections[m].length; y < z; y++) {
isAncestor(collections[m][y], root) && ret.push(collections[m][y]);
}
}
result = result.concat(ret);
}
// });
return result;
}
var oldQwery = context.qwery;
qwery.noConflict = function () {
context.qwery = oldQwery;
return this;
};
context.qwery = qwery;
}(this, document);