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var _ = require("underscore");
exports.Element = Element;
exports.element = function(name, attributes, children) {
return new Element(name, attributes, children);
};
exports.text = function(value) {
return {
type: "text",
value: value
};
};
var emptyElement = exports.emptyElement = {
first: function() {
return null;
},
firstOrEmpty: function() {
return emptyElement;
},
attributes: {},
children: []
};
function Element(name, attributes, children) {
this.type = "element";
this.name = name;
this.attributes = attributes || {};
this.children = children || [];
}
Element.prototype.first = function(name) {
return _.find(this.children, function(child) {
return child.name === name;
});
};
Element.prototype.firstOrEmpty = function(name) {
return this.first(name) || emptyElement;
};
Element.prototype.getElementsByTagName = function(name) {
var elements = _.filter(this.children, function(child) {
return child.name === name;
});
return toElementList(elements);
};
Element.prototype.text = function() {
if (this.children.length === 0) {
return "";
} else if (this.children.length !== 1 || this.children[0].type !== "text") {
throw new Error("Not implemented");
}
return this.children[0].value;
};
var elementListPrototype = {
getElementsByTagName: function(name) {
return toElementList(_.flatten(this.map(function(element) {
return element.getElementsByTagName(name);
}, true)));
}
};
function toElementList(array) {
return _.extend(array, elementListPrototype);
}
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