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var DomUtils = require("domutils"),
hasAttrib = DomUtils.hasAttrib,
getAttributeValue = DomUtils.getAttributeValue,
falseFunc = require("boolbase").falseFunc;
//https://github.com/slevithan/XRegExp/blob/master/src/xregexp.js#L469
var reChars = /[-[\]{}()*+?.,\\^$|#\s]/g;
/*
attribute selectors
*/
var attributeRules = {
__proto__: null,
equals: function(next, data){
var name = data.name,
value = data.value;
if(data.ignoreCase){
value = value.toLowerCase();
return function equalsIC(elem){
var attr = getAttributeValue(elem, name);
return attr != null && attr.toLowerCase() === value && next(elem);
};
}
return function equals(elem){
return getAttributeValue(elem, name) === value && next(elem);
};
},
hyphen: function(next, data){
var name = data.name,
value = data.value,
len = value.length;
if(data.ignoreCase){
value = value.toLowerCase();
return function hyphenIC(elem){
var attr = getAttributeValue(elem, name);
return attr != null &&
(attr.length === len || attr.charAt(len) === "-") &&
attr.substr(0, len).toLowerCase() === value &&
next(elem);
};
}
return function hyphen(elem){
var attr = getAttributeValue(elem, name);
return attr != null &&
attr.substr(0, len) === value &&
(attr.length === len || attr.charAt(len) === "-") &&
next(elem);
};
},
element: function(next, data){
var name = data.name,
value = data.value;
if(/\s/.test(value)){
return falseFunc;
}
value = value.replace(reChars, "\\$&");
var pattern = "(?:^|\\s)" + value + "(?:$|\\s)",
flags = data.ignoreCase ? "i" : "",
regex = new RegExp(pattern, flags);
return function element(elem){
var attr = getAttributeValue(elem, name);
return attr != null && regex.test(attr) && next(elem);
};
},
exists: function(next, data){
var name = data.name;
return function exists(elem){
return hasAttrib(elem, name) && next(elem);
};
},
start: function(next, data){
var name = data.name,
value = data.value,
len = value.length;
if(len === 0){
return falseFunc;
}
if(data.ignoreCase){
value = value.toLowerCase();
return function startIC(elem){
var attr = getAttributeValue(elem, name);
return attr != null && attr.substr(0, len).toLowerCase() === value && next(elem);
};
}
return function start(elem){
var attr = getAttributeValue(elem, name);
return attr != null && attr.substr(0, len) === value && next(elem);
};
},
end: function(next, data){
var name = data.name,
value = data.value,
len = -value.length;
if(len === 0){
return falseFunc;
}
if(data.ignoreCase){
value = value.toLowerCase();
return function endIC(elem){
var attr = getAttributeValue(elem, name);
return attr != null && attr.substr(len).toLowerCase() === value && next(elem);
};
}
return function end(elem){
var attr = getAttributeValue(elem, name);
return attr != null && attr.substr(len) === value && next(elem);
};
},
any: function(next, data){
var name = data.name,
value = data.value;
if(value === ""){
return falseFunc;
}
if(data.ignoreCase){
var regex = new RegExp(value.replace(reChars, "\\$&"), "i");
return function anyIC(elem){
var attr = getAttributeValue(elem, name);
return attr != null && regex.test(attr) && next(elem);
};
}
return function any(elem){
var attr = getAttributeValue(elem, name);
return attr != null && attr.indexOf(value) >= 0 && next(elem);
};
},
not: function(next, data){
var name = data.name,
value = data.value;
if(value === ""){
return function notEmpty(elem){
return !!getAttributeValue(elem, name) && next(elem);
};
} else if(data.ignoreCase){
value = value.toLowerCase();
return function notIC(elem){
var attr = getAttributeValue(elem, name);
return attr != null && attr.toLowerCase() !== value && next(elem);
};
}
return function not(elem){
return getAttributeValue(elem, name) !== value && next(elem);
};
}
};
module.exports = {
compile: function(next, data, options){
if(options && options.strict && (
data.ignoreCase || data.action === "not"
)) throw SyntaxError("Unsupported attribute selector");
return attributeRules[data.action](next, data);
},
rules: attributeRules
};
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