<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<script src="http://code.jquery.com/jquery-latest.js"></script>
<title></title>
</head>
<body>
<button id="test1">模拟编译原理,点击选中checked</button>
<div id="text">
<div class="Aaron">
<input type="checkbox" name="readme" />
<input type="checkbox" name="ttt" />
<input type="checkbox" name="aaa" />
<p>Sizzle</p>
</div>
</div>
<script type="text/javascript">
var filter = {
ATTR: function(name, operator,check) {
return function(elem) {
var attr = elem.getAttribute(name)
if (operator === "=") {
if(attr === check){
return true
}
}
return false;
}
},
TAG: function(nodeNameSelector) {
return function(elem) {
return elem.nodeName && elem.nodeName.toLowerCase() === nodeNameSelector;
};
}
}
function addCombinator(matcher) {
return function(elem, context, xml) {
while ((elem = elem['parentNode'])) {
if (elem.nodeType === 1) {
//找到第一个亲密的节点，立马就用终极匹配器判断这个节点是否符合前面的规则
return matcher(elem);
}
}
}
}
function elementMatcher(matchers) {
return matchers.length > 1 ?
function(elem, context, xml) {
var i = matchers.length;
while (i--) {
if (!matchers[i](elem, context, xml)) {
return false;
}
}
return true;
} :
//单个匹配器的话就返回自己即可
matchers[0];
}
function matcherFromTokens(tokens){
var len = tokens.length;
var matcher, matchers = [];
for (i = 0; i < len; i++) {
if (tokens[i].type === " ") {
matchers = [addCombinator(elementMatcher(matchers), matcher)];
} else {
matcher = filter[tokens[i].type].apply(null, tokens[i].matches);
matchers.push(matcher);
}
}
return elementMatcher(matchers);
}
function compile() {
//种子合集
var seed = document.querySelectorAll('input')
//选择器
var selector = "Aaron [name=ttt]";
var elementMatchers = [];
var results = []
var match = [{
matches: ["div"],
type: "TAG",
value: "Aaron"
}, {
type: " ",
value: " "
}, {
matches: ["name", "=", "ttt"],
type: "ATTR",
value: "[name=ttt]"
}]
elementMatchers.push(matcherFromTokens(match));
var matcher, elem;
for (var i = 0; i < seed.length; i++) {
matcher = elementMatchers[0];
var elem = seed[i];
if (matcher(elem)) {
results.push(elem);
break;
}
}
results[0].checked = 'checked'
}
$('#test1').click(function() {
compile();
})
</script>
</body>
</html>
