var ElementType = require(“domelementtype”);
var re_whitespace = /s+/g; var NodePrototype = require(“./lib/node”); var ElementPrototype = require(“./lib/element”);
function DomHandler(callback, options, elementCB){
if(typeof callback === "object"){ elementCB = options; options = callback; callback = null; } else if(typeof options === "function"){ elementCB = options; options = defaultOpts; } this._callback = callback; this._options = options || defaultOpts; this._elementCB = elementCB; this.dom = []; this._done = false; this._tagStack = []; this._parser = this._parser || null;
}
//default options var defaultOpts = {
normalizeWhitespace: false, //Replace all whitespace with single spaces withStartIndices: false, //Add startIndex properties to nodes
};
DomHandler.prototype.onparserinit = function(parser){
this._parser = parser;
};
//Resets the handler back to starting state DomHandler.prototype.onreset = function(){
DomHandler.call(this, this._callback, this._options, this._elementCB);
};
//Signals the handler that parsing is done DomHandler.prototype.onend = function(){
if(this._done) return; this._done = true; this._parser = null; this._handleCallback(null);
};
DomHandler.prototype._handleCallback = DomHandler.prototype.onerror = function(error){
if(typeof this._callback === "function"){ this._callback(error, this.dom); } else { if(error) throw error; }
};
DomHandler.prototype.onclosetag = function(){
//if(this._tagStack.pop().name !== name) this._handleCallback(Error("Tagname didn't match!")); var elem = this._tagStack.pop(); if(this._elementCB) this._elementCB(elem);
};
DomHandler.prototype._addDomElement = function(element){
var parent = this._tagStack[this._tagStack.length - 1]; var siblings = parent ? parent.children : this.dom; var previousSibling = siblings[siblings.length - 1]; element.next = null; if(this._options.withStartIndices){ element.startIndex = this._parser.startIndex; } if (this._options.withDomLvl1) { element.__proto__ = element.type === "tag" ? ElementPrototype : NodePrototype; } if(previousSibling){ element.prev = previousSibling; previousSibling.next = element; } else { element.prev = null; } siblings.push(element); element.parent = parent || null;
};
DomHandler.prototype.onopentag = function(name, attribs){
var element = { type: name === "script" ? ElementType.Script : name === "style" ? ElementType.Style : ElementType.Tag, name: name, attribs: attribs, children: [] }; this._addDomElement(element); this._tagStack.push(element);
};
DomHandler.prototype.ontext = function(data){
//the ignoreWhitespace is officially dropped, but for now, //it's an alias for normalizeWhitespace var normalize = this._options.normalizeWhitespace || this._options.ignoreWhitespace; var lastTag; if(!this._tagStack.length && this.dom.length && (lastTag = this.dom[this.dom.length-1]).type === ElementType.Text){ if(normalize){ lastTag.data = (lastTag.data + data).replace(re_whitespace, " "); } else { lastTag.data += data; } } else { if( this._tagStack.length && (lastTag = this._tagStack[this._tagStack.length - 1]) && (lastTag = lastTag.children[lastTag.children.length - 1]) && lastTag.type === ElementType.Text ){ if(normalize){ lastTag.data = (lastTag.data + data).replace(re_whitespace, " "); } else { lastTag.data += data; } } else { if(normalize){ data = data.replace(re_whitespace, " "); } this._addDomElement({ data: data, type: ElementType.Text }); } }
};
DomHandler.prototype.oncomment = function(data){
var lastTag = this._tagStack[this._tagStack.length - 1]; if(lastTag && lastTag.type === ElementType.Comment){ lastTag.data += data; return; } var element = { data: data, type: ElementType.Comment }; this._addDomElement(element); this._tagStack.push(element);
};
DomHandler.prototype.oncdatastart = function(){
var element = { children: [{ data: "", type: ElementType.Text }], type: ElementType.CDATA }; this._addDomElement(element); this._tagStack.push(element);
};
DomHandler.prototype.oncommentend = DomHandler.prototype.oncdataend = function(){
this._tagStack.pop();
};
DomHandler.prototype.onprocessinginstruction = function(name, data){
this._addDomElement({ name: name, data: data, type: ElementType.Directive });
};
module.exports = DomHandler;