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