/*
Script: Selectors.js
Adds advanced CSS Querying capabilities for targeting elements. Also includes pseudoselectors support.
License:
MIT-style license.
*/
Native.implement([Document, Element], {
getElements: function(expression, nocash){
expression = expression.split(',');
var items, local = {};
for (var i = 0, l = expression.length; i < l; i++){
var selector = expression[i], elements = Selectors.Utils.search(this, selector, local);
if (i != 0 && elements.item) elements = $A(elements);
items = (i == 0) ? elements : (items.item) ? $A(items).concat(elements) : items.concat(elements);
}
return new Elements(items, {ddup: (expression.length > 1), cash: !nocash});
}
});
Element.implement({
match: function(selector){
if (!selector) return true;
var tagid = Selectors.Utils.parseTagAndID(selector);
var tag = tagid[0], id = tagid[1];
if (!Selectors.Filters.byID(this, id) || !Selectors.Filters.byTag(this, tag)) return false;
var parsed = Selectors.Utils.parseSelector(selector);
return (parsed) ? Selectors.Utils.filter(this, parsed, {}) : true;
}
});
var Selectors = {Cache: {nth: {}, parsed: {}}};
Selectors.RegExps = {
id: (/#([\w-]+)/),
tag: (/^(\w+|\*)/),
quick: (/^(\w+|\*)$/),
splitter: (/\s*([+>~\s])\s*([a-zA-Z#.*:\[])/g),
combined: (/\.([\w-]+)|\[(\w+)(?:([!*^$~|]?=)["']?(.*?)["']?)?\]|:([\w-]+)(?:\(["']?(.*?)?["']?\)|$)/g)
};
Selectors.Utils = {
chk: function(item, uniques){
if (!uniques) return true;
var uid = $uid(item);
if (!uniques[uid]) return uniques[uid] = true;
return false;
},
parseNthArgument: function(argument){
if (Selectors.Cache.nth[argument]) return Selectors.Cache.nth[argument];
var parsed = argument.match(/^([+-]?\d*)?([a-z]+)?([+-]?\d*)?$/);
if (!parsed) return false;
var inta = parseInt(parsed[1]);
var a = (inta || inta === 0) ? inta : 1;
var special = parsed[2] || false;
var b = parseInt(parsed[3]) || 0;
if (a != 0){
b--;
while (b < 1) b += a;
while (b >= a) b -= a;
} else {
a = b;
special = 'index';
}
switch (special){
case 'n': parsed = {a: a, b: b, special: 'n'}; break;
case 'odd': parsed = {a: 2, b: 0, special: 'n'}; break;
case 'even': parsed = {a: 2, b: 1, special: 'n'}; break;
case 'first': parsed = {a: 0, special: 'index'}; break;
case 'last': parsed = {special: 'last-child'}; break;
case 'only': parsed = {special: 'only-child'}; break;
default: parsed = {a: (a - 1), special: 'index'};
}
return Selectors.Cache.nth[argument] = parsed;
},
parseSelector: function(selector){
if (Selectors.Cache.parsed[selector]) return Selectors.Cache.parsed[selector];
var m, parsed = {classes: [], pseudos: [], attributes: []};
while ((m = Selectors.RegExps.combined.exec(selector))){
var cn = m[1], an = m[2], ao = m[3], av = m[4], pn = m[5], pa = m[6];
if (cn){
parsed.classes.push(cn);
} else if (pn){
var parser = Selectors.Pseudo.get(pn);
if (parser) parsed.pseudos.push({parser: parser, argument: pa});
else parsed.attributes.push({name: pn, operator: '=', value: pa});
} else if (an){
parsed.attributes.push({name: an, operator: ao, value: av});
}
}
if (!parsed.classes.length) delete parsed.classes;
if (!parsed.attributes.length) delete parsed.attributes;
if (!parsed.pseudos.length) delete parsed.pseudos;
if (!parsed.classes && !parsed.attributes && !parsed.pseudos) parsed = null;
return Selectors.Cache.parsed[selector] = parsed;
},
parseTagAndID: function(selector){
var tag = selector.match(Selectors.RegExps.tag);
var id = selector.match(Selectors.RegExps.id);
return [(tag) ? tag[1] : '*', (id) ? id[1] : false];
},
filter: function(item, parsed, local){
var i;
if (parsed.classes){
for (i = parsed.classes.length; i--; i){
var cn = parsed.classes[i];
if (!Selectors.Filters.byClass(item, cn)) return false;
}
}
if (parsed.attributes){
for (i = parsed.attributes.length; i--; i){
var att = parsed.attributes[i];
if (!Selectors.Filters.byAttribute(item, att.name, att.operator, att.value)) return false;
}
}
if (parsed.pseudos){
for (i = parsed.pseudos.length; i--; i){
var psd = parsed.pseudos[i];
if (!Selectors.Filters.byPseudo(item, psd.parser, psd.argument, local)) return false;
}
}
return true;
},
getByTagAndID: function(ctx, tag, id){
if (id){
var item = (ctx.getElementById) ? ctx.getElementById(id, true) : Element.getElementById(ctx, id, true);
return (item && Selectors.Filters.byTag(item, tag)) ? [item] : [];
} else {
return ctx.getElementsByTagName(tag);
}
},
search: function(self, expression, local){
var splitters = [];
var selectors = expression.trim().replace(Selectors.RegExps.splitter, function(m0, m1, m2){
splitters.push(m1);
return ':)' + m2;
}).split(':)');
var items, match, filtered, item;
for (var i = 0, l = selectors.length; i < l; i++){
var selector = selectors[i];
if (i == 0 && Selectors.RegExps.quick.test(selector)){
items = self.getElementsByTagName(selector);
continue;
}
var splitter = splitters[i - 1];
var tagid = Selectors.Utils.parseTagAndID(selector);
var tag = tagid[0], id = tagid[1];
if (i == 0){
items = Selectors.Utils.getByTagAndID(self, tag, id);
} else {
var uniques = {}, found = [];
for (var j = 0, k = items.length; j < k; j++) found = Selectors.Getters[splitter](found, items[j], tag, id, uniques);
items = found;
}
var parsed = Selectors.Utils.parseSelector(selector);
if (parsed){
filtered = [];
for (var m = 0, n = items.length; m < n; m++){
item = items[m];
if (Selectors.Utils.filter(item, parsed, local)) filtered.push(item);
}
items = filtered;
}
}
return items;
}
};
Selectors.Getters = {
' ': function(found, self, tag, id, uniques){
var items = Selectors.Utils.getByTagAndID(self, tag, id);
for (var i = 0, l = items.length; i < l; i++){
var item = items[i];
if (Selectors.Utils.chk(item, uniques)) found.push(item);
}
return found;
},
'>': function(found, self, tag, id, uniques){
var children = Selectors.Utils.getByTagAndID(self, tag, id);
for (var i = 0, l = children.length; i < l; i++){
var child = children[i];
if (child.parentNode == self && Selectors.Utils.chk(child, uniques)) found.push(child);
}
return found;
},
'+': function(found, self, tag, id, uniques){
while ((self = self.nextSibling)){
if (self.nodeType == 1){
if (Selectors.Utils.chk(self, uniques) && Selectors.Filters.byTag(self, tag) && Selectors.Filters.byID(self, id)) found.push(self);
break;
}
}
return found;
},
'~': function(found, self, tag, id, uniques){
while ((self = self.nextSibling)){
if (self.nodeType == 1){
if (!Selectors.Utils.chk(self, uniques)) break;
if (Selectors.Filters.byTag(self, tag) && Selectors.Filters.byID(self, id)) found.push(self);
}
}
return found;
}
};
Selectors.Filters = {
byTag: function(self, tag){
return (tag == '*' || (self.tagName && self.tagName.toLowerCase() == tag));
},
byID: function(self, id){
return (!id || (self.id && self.id == id));
},
byClass: function(self, klass){
return (self.className && self.className.contains(klass, ' '));
},
byPseudo: function(self, parser, argument, local){
return parser.call(self, argument, local);
},
byAttribute: function(self, name, operator, value){
var result = Element.prototype.getProperty.call(self, name);
if (!result) return false;
if (!operator || value == undefined) return true;
switch (operator){
case '=': return (result == value);
case '*=': return (result.contains(value));
case '^=': return (result.substr(0, value.length) == value);
case '$=': return (result.substr(result.length - value.length) == value);
case '!=': return (result != value);
case '~=': return result.contains(value, ' ');
case '|=': return result.contains(value, '-');
}
return false;
}
};
Selectors.Pseudo = new Hash({
// w3c pseudo selectors
empty: function(){
return !(this.innerText || this.textContent || '').length;
},
not: function(selector){
return !Element.match(this, selector);
},
contains: function(text){
return (this.innerText || this.textContent || '').contains(text);
},
'first-child': function(){
return Selectors.Pseudo.index.call(this, 0);
},
'last-child': function(){
var element = this;
while ((element = element.nextSibling)){
if (element.nodeType == 1) return false;
}
return true;
},
'only-child': function(){
var prev = this;
while ((prev = prev.previousSibling)){
if (prev.nodeType == 1) return false;
}
var next = this;
while ((next = next.nextSibling)){
if (next.nodeType == 1) return false;
}
return true;
},
'nth-child': function(argument, local){
argument = (argument == undefined) ? 'n' : argument;
var parsed = Selectors.Utils.parseNthArgument(argument);
if (parsed.special != 'n') return Selectors.Pseudo[parsed.special].call(this, parsed.a, local);
var count = 0;
local.positions = local.positions || {};
var uid = $uid(this);
if (!local.positions[uid]){
var self = this;
while ((self = self.previousSibling)){
if (self.nodeType != 1) continue;
count ++;
var position = local.positions[$uid(self)];
if (position != undefined){
count = position + count;
break;
}
}
local.positions[uid] = count;
}
return (local.positions[uid] % parsed.a == parsed.b);
},
// custom pseudo selectors
index: function(index){
var element = this, count = 0;
while ((element = element.previousSibling)){
if (element.nodeType == 1 && ++count > index) return false;
}
return (count == index);
},
even: function(argument, local){
return Selectors.Pseudo['nth-child'].call(this, '2n+1', local);
},
odd: function(argument, local){
return Selectors.Pseudo['nth-child'].call(this, '2n', local);
}
});