var Tokenizer = require("./Tokenizer.js"); /* Options: xmlMode: Disables the special behavior for script/style tags (false by default) lowerCaseAttributeNames: call .toLowerCase for each attribute name (true if xmlMode is `false`) lowerCaseTags: call .toLowerCase for each tag name (true if xmlMode is `false`) */ /* Callbacks: oncdataend, oncdatastart, onclosetag, oncomment, oncommentend, onerror, onopentag, onprocessinginstruction, onreset, ontext */ var formTags = { input: true, option: true, optgroup: true, select: true, button: true, datalist: true, textarea: true }; var openImpliesClose = { tr : { tr:true, th:true, td:true }, th : { th:true }, td : { thead:true, th:true, td:true }, body : { head:true, link:true, script:true }, li : { li:true }, p : { p:true }, h1 : { p:true }, h2 : { p:true }, h3 : { p:true }, h4 : { p:true }, h5 : { p:true }, h6 : { p:true }, select : formTags, input : formTags, output : formTags, button : formTags, datalist: formTags, textarea: formTags, option : { option:true }, optgroup: { optgroup:true } }; var voidElements = { __proto__: null, area: true, base: true, basefont: true, br: true, col: true, command: true, embed: true, frame: true, hr: true, img: true, input: true, isindex: true, keygen: true, link: true, meta: true, param: true, source: true, track: true, wbr: true, //common self closing svg elements path: true, circle: true, ellipse: true, line: true, rect: true, use: true, stop: true, polyline: true, polygon: true }; var re_nameEnd = /\s|\//; function Parser(cbs, options){ this._options = options || {}; this._cbs = cbs || {}; this._tagname = ""; this._attribname = ""; this._attribvalue = ""; this._attribs = null; this._stack = []; this.startIndex = 0; this.endIndex = null; this._lowerCaseTagNames = "lowerCaseTags" in this._options ? !!this._options.lowerCaseTags : !this._options.xmlMode; this._lowerCaseAttributeNames = "lowerCaseAttributeNames" in this._options ? !!this._options.lowerCaseAttributeNames : !this._options.xmlMode; this._tokenizer = new Tokenizer(this._options, this); if(this._cbs.onparserinit) this._cbs.onparserinit(this); } require("util").inherits(Parser, require("events").EventEmitter); Parser.prototype._updatePosition = function(initialOffset){ if(this.endIndex === null){ if(this._tokenizer._sectionStart <= initialOffset){ this.startIndex = 0; } else { this.startIndex = this._tokenizer._sectionStart - initialOffset; } } else this.startIndex = this.endIndex + 1; this.endIndex = this._tokenizer.getAbsoluteIndex(); }; //Tokenizer event handlers Parser.prototype.ontext = function(data){ this._updatePosition(1); this.endIndex--; if(this._cbs.ontext) this._cbs.ontext(data); }; Parser.prototype.onopentagname = function(name){ if(this._lowerCaseTagNames){ name = name.toLowerCase(); } this._tagname = name; if(!this._options.xmlMode && name in openImpliesClose) { for( var el; (el = this._stack[this._stack.length - 1]) in openImpliesClose[name]; this.onclosetag(el) ); } if(this._options.xmlMode || !(name in voidElements)){ this._stack.push(name); } if(this._cbs.onopentagname) this._cbs.onopentagname(name); if(this._cbs.onopentag) this._attribs = {}; }; Parser.prototype.onopentagend = function(){ this._updatePosition(1); if(this._attribs){ if(this._cbs.onopentag) this._cbs.onopentag(this._tagname, this._attribs); this._attribs = null; } if(!this._options.xmlMode && this._cbs.onclosetag && this._tagname in voidElements){ this._cbs.onclosetag(this._tagname); } this._tagname = ""; }; Parser.prototype.onclosetag = function(name){ this._updatePosition(1); if(this._lowerCaseTagNames){ name = name.toLowerCase(); } if(this._stack.length && (!(name in voidElements) || this._options.xmlMode)){ var pos = this._stack.lastIndexOf(name); if(pos !== -1){ if(this._cbs.onclosetag){ pos = this._stack.length - pos; while(pos--) this._cbs.onclosetag(this._stack.pop()); } else this._stack.length = pos; } else if(name === "p" && !this._options.xmlMode){ this.onopentagname(name); this._closeCurrentTag(); } } else if(!this._options.xmlMode && (name === "br" || name === "p")){ this.onopentagname(name); this._closeCurrentTag(); } }; Parser.prototype.onselfclosingtag = function(){ if(this._options.xmlMode || this._options.recognizeSelfClosing){ this._closeCurrentTag(); } else { this.onopentagend(); } }; Parser.prototype._closeCurrentTag = function(){ var name = this._tagname; this.onopentagend(); //self-closing tags will be on the top of the stack //(cheaper check than in onclosetag) if(this._stack[this._stack.length - 1] === name){ if(this._cbs.onclosetag){ this._cbs.onclosetag(name); } this._stack.pop(); } }; Parser.prototype.onattribname = function(name){ if(this._lowerCaseAttributeNames){ name = name.toLowerCase(); } this._attribname = name; }; Parser.prototype.onattribdata = function(value){ this._attribvalue += value; }; Parser.prototype.onattribend = function(){ if(this._cbs.onattribute) this._cbs.onattribute(this._attribname, this._attribvalue); if( this._attribs && !Object.prototype.hasOwnProperty.call(this._attribs, this._attribname) ){ this._attribs[this._attribname] = this._attribvalue; } this._attribname = ""; this._attribvalue = ""; }; Parser.prototype._getInstructionName = function(value){ var idx = value.search(re_nameEnd), name = idx < 0 ? value : value.substr(0, idx); if(this._lowerCaseTagNames){ name = name.toLowerCase(); } return name; }; Parser.prototype.ondeclaration = function(value){ if(this._cbs.onprocessinginstruction){ var name = this._getInstructionName(value); this._cbs.onprocessinginstruction("!" + name, "!" + value); } }; Parser.prototype.onprocessinginstruction = function(value){ if(this._cbs.onprocessinginstruction){ var name = this._getInstructionName(value); this._cbs.onprocessinginstruction("?" + name, "?" + value); } }; Parser.prototype.oncomment = function(value){ this._updatePosition(4); if(this._cbs.oncomment) this._cbs.oncomment(value); if(this._cbs.oncommentend) this._cbs.oncommentend(); }; Parser.prototype.oncdata = function(value){ this._updatePosition(1); if(this._options.xmlMode || this._options.recognizeCDATA){ if(this._cbs.oncdatastart) this._cbs.oncdatastart(); if(this._cbs.ontext) this._cbs.ontext(value); if(this._cbs.oncdataend) this._cbs.oncdataend(); } else { this.oncomment("[CDATA[" + value + "]]"); } }; Parser.prototype.onerror = function(err){ if(this._cbs.onerror) this._cbs.onerror(err); }; Parser.prototype.onend = function(){ if(this._cbs.onclosetag){ for( var i = this._stack.length; i > 0; this._cbs.onclosetag(this._stack[--i]) ); } if(this._cbs.onend) this._cbs.onend(); }; //Resets the parser to a blank state, ready to parse a new HTML document Parser.prototype.reset = function(){ if(this._cbs.onreset) this._cbs.onreset(); this._tokenizer.reset(); this._tagname = ""; this._attribname = ""; this._attribs = null; this._stack = []; if(this._cbs.onparserinit) this._cbs.onparserinit(this); }; //Parses a complete HTML document and pushes it to the handler Parser.prototype.parseComplete = function(data){ this.reset(); this.end(data); }; Parser.prototype.write = function(chunk){ this._tokenizer.write(chunk); }; Parser.prototype.end = function(chunk){ this._tokenizer.end(chunk); }; Parser.prototype.pause = function(){ this._tokenizer.pause(); }; Parser.prototype.resume = function(){ this._tokenizer.resume(); }; //alias for backwards compat Parser.prototype.parseChunk = Parser.prototype.write; Parser.prototype.done = Parser.prototype.end; module.exports = Parser;