var ElementType = require(“domelementtype”); var isTag = exports.isTag = ElementType.isTag;

exports.testElement = function(options, element){

for(var key in options){
        if(!options.hasOwnProperty(key));
        else if(key === "tag_name"){
                if(!isTag(element) || !options.tag_name(element.name)){
                        return false;
                }
        } else if(key === "tag_type"){
                if(!options.tag_type(element.type)) return false;
        } else if(key === "tag_contains"){
                if(isTag(element) || !options.tag_contains(element.data)){
                        return false;
                }
        } else if(!element.attribs || !options[key](element.attribs[key])){
                return false;
        }
}
return true;

};

var Checks = {

tag_name: function(name){
        if(typeof name === "function"){
                return function(elem){ return isTag(elem) && name(elem.name); };
        } else if(name === "*"){
                return isTag;
        } else {
                return function(elem){ return isTag(elem) && elem.name === name; };
        }
},
tag_type: function(type){
        if(typeof type === "function"){
                return function(elem){ return type(elem.type); };
        } else {
                return function(elem){ return elem.type === type; };
        }
},
tag_contains: function(data){
        if(typeof data === "function"){
                return function(elem){ return !isTag(elem) && data(elem.data); };
        } else {
                return function(elem){ return !isTag(elem) && elem.data === data; };
        }
}

};

function getAttribCheck(attrib, value){

if(typeof value === "function"){
        return function(elem){ return elem.attribs && value(elem.attribs[attrib]); };
} else {
        return function(elem){ return elem.attribs && elem.attribs[attrib] === value; };
}

}

function combineFuncs(a, b){

return function(elem){
        return a(elem) || b(elem);
};

}

exports.getElements = function(options, element, recurse, limit){

var funcs = Object.keys(options).map(function(key){
        var value = options[key];
        return key in Checks ? Checks[key](value) : getAttribCheck(key, value);
});

return funcs.length === 0 ? [] : this.filter(
        funcs.reduce(combineFuncs),
        element, recurse, limit
);

};

exports.getElementById = function(id, element, recurse){

if(!Array.isArray(element)) element = [element];
return this.findOne(getAttribCheck("id", id), element, recurse !== false);

};

exports.getElementsByTagName = function(name, element, recurse, limit){

return this.filter(Checks.tag_name(name), element, recurse, limit);

};

exports.getElementsByTagType = function(type, element, recurse, limit){

return this.filter(Checks.tag_type(type), element, recurse, limit);

};