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;(function($){
var zepto = $.zepto, oldQsa = zepto.qsa, oldMatches = zepto.matches
function visible(elem){
elem = $(elem)
return !!(elem.width() || elem.height()) && elem.css("display") !== "none"
}
// Implements a subset from:
// http://api.jquery.com/category/selectors/jquery-selector-extensions/
//
// Each filter function receives the current index, all nodes in the
// considered set, and a value if there were parentheses. The value
// of `this` is the node currently being considered. The function returns the
// resulting node(s), null, or undefined.
//
// Complex selectors are not supported:
// li:has(label:contains("foo")) + li:has(label:contains("bar"))
// ul.inner:first > li
var filters = $.expr[':'] = {
visible: function(){ if (visible(this)) return this },
hidden: function(){ if (!visible(this)) return this },
selected: function(){ if (this.selected) return this },
checked: function(){ if (this.checked) return this },
parent: function(){ return this.parentNode },
first: function(idx){ if (idx === 0) return this },
last: function(idx, nodes){ if (idx === nodes.length - 1) return this },
eq: function(idx, _, value){ if (idx === value) return this },
contains: function(idx, _, text){ if ($(this).text().indexOf(text) > -1) return this },
has: function(idx, _, sel){ if (zepto.qsa(this, sel).length) return this }
}
var filterRe = new RegExp('(.*):(\\w+)(?:\\(([^)]+)\\))?$\\s*'),
childRe = /^\s*>/,
classTag = 'Zepto' + (+new Date())
function process(sel, fn) {
// quote the hash in `a[href^=#]` expression
sel = sel.replace(/=#\]/g, '="#"]')
var filter, arg, match = filterRe.exec(sel)
if (match && match[2] in filters) {
var filter = filters[match[2]], arg = match[3]
sel = match[1]
if (arg) {
var num = Number(arg)
if (isNaN(num)) arg = arg.replace(/^["']|["']$/g, '')
else arg = num
}
}
return fn(sel, filter, arg)
}
zepto.qsa = function(node, selector) {
return process(selector, function(sel, filter, arg){
try {
var taggedParent
if (!sel && filter) sel = '*'
else if (childRe.test(sel))
// support "> *" child queries by tagging the parent node with a
// unique class and prepending that classname onto the selector
taggedParent = $(node).addClass(classTag), sel = '.'+classTag+' '+sel
var nodes = oldQsa(node, sel)
} catch(e) {
console.error('error performing selector: %o', selector)
throw e
} finally {
if (taggedParent) taggedParent.removeClass(classTag)
}
return !filter ? nodes :
zepto.uniq($.map(nodes, function(n, i){ return filter.call(n, i, nodes, arg) }))
})
}
zepto.matches = function(node, selector){
return process(selector, function(sel, filter, arg){
return (!sel || oldMatches(node, sel)) &&
(!filter || filter.call(node, null, arg) === node)
})
}
})(Zepto)
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