154 lines
4.6 KiB
JavaScript
154 lines
4.6 KiB
JavaScript
'use strict';
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var Tokenizer = require('../tokenizer'),
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foreignContent = require('../common/foreign_content'),
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UNICODE = require('../common/unicode'),
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HTML = require('../common/html');
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//Aliases
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var $ = HTML.TAG_NAMES,
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NS = HTML.NAMESPACES;
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//ParserFeedbackSimulator
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//Simulates adjustment of the Tokenizer which performed by standard parser during tree construction.
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var ParserFeedbackSimulator = module.exports = function (tokenizer) {
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this.tokenizer = tokenizer;
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this.namespaceStack = [];
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this.namespaceStackTop = -1;
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this._enterNamespace(NS.HTML);
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};
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ParserFeedbackSimulator.prototype.getNextToken = function () {
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var token = this.tokenizer.getNextToken();
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if (token.type === Tokenizer.START_TAG_TOKEN)
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this._handleStartTagToken(token);
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else if (token.type === Tokenizer.END_TAG_TOKEN)
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this._handleEndTagToken(token);
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else if (token.type === Tokenizer.NULL_CHARACTER_TOKEN && this.inForeignContent) {
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token.type = Tokenizer.CHARACTER_TOKEN;
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token.chars = UNICODE.REPLACEMENT_CHARACTER;
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}
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else if (this.skipNextNewLine) {
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if (token.type !== Tokenizer.HIBERNATION_TOKEN)
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this.skipNextNewLine = false;
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if (token.type === Tokenizer.WHITESPACE_CHARACTER_TOKEN && token.chars[0] === '\n') {
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if (token.chars.length === 1)
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return this.getNextToken();
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token.chars = token.chars.substr(1);
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}
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}
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return token;
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};
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//Namespace stack mutations
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ParserFeedbackSimulator.prototype._enterNamespace = function (namespace) {
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this.namespaceStackTop++;
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this.namespaceStack.push(namespace);
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this.inForeignContent = namespace !== NS.HTML;
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this.currentNamespace = namespace;
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this.tokenizer.allowCDATA = this.inForeignContent;
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};
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ParserFeedbackSimulator.prototype._leaveCurrentNamespace = function () {
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this.namespaceStackTop--;
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this.namespaceStack.pop();
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this.currentNamespace = this.namespaceStack[this.namespaceStackTop];
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this.inForeignContent = this.currentNamespace !== NS.HTML;
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this.tokenizer.allowCDATA = this.inForeignContent;
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};
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//Token handlers
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ParserFeedbackSimulator.prototype._ensureTokenizerMode = function (tn) {
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if (tn === $.TEXTAREA || tn === $.TITLE)
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this.tokenizer.state = Tokenizer.MODE.RCDATA;
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else if (tn === $.PLAINTEXT)
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this.tokenizer.state = Tokenizer.MODE.PLAINTEXT;
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else if (tn === $.SCRIPT)
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this.tokenizer.state = Tokenizer.MODE.SCRIPT_DATA;
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else if (tn === $.STYLE || tn === $.IFRAME || tn === $.XMP ||
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tn === $.NOEMBED || tn === $.NOFRAMES || tn === $.NOSCRIPT)
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this.tokenizer.state = Tokenizer.MODE.RAWTEXT;
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};
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ParserFeedbackSimulator.prototype._handleStartTagToken = function (token) {
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var tn = token.tagName;
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if (tn === $.SVG)
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this._enterNamespace(NS.SVG);
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else if (tn === $.MATH)
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this._enterNamespace(NS.MATHML);
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if (this.inForeignContent) {
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if (foreignContent.causesExit(token)) {
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this._leaveCurrentNamespace();
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return;
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}
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var currentNs = this.currentNamespace;
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if (currentNs === NS.MATHML)
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foreignContent.adjustTokenMathMLAttrs(token);
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else if (currentNs === NS.SVG) {
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foreignContent.adjustTokenSVGTagName(token);
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foreignContent.adjustTokenSVGAttrs(token);
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}
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foreignContent.adjustTokenXMLAttrs(token);
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tn = token.tagName;
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if (!token.selfClosing && foreignContent.isIntegrationPoint(tn, currentNs, token.attrs))
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this._enterNamespace(NS.HTML);
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}
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else {
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if (tn === $.PRE || tn === $.TEXTAREA || tn === $.LISTING)
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this.skipNextNewLine = true;
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else if (tn === $.IMAGE)
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token.tagName = $.IMG;
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this._ensureTokenizerMode(tn);
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}
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};
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ParserFeedbackSimulator.prototype._handleEndTagToken = function (token) {
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var tn = token.tagName;
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if (!this.inForeignContent) {
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var previousNs = this.namespaceStack[this.namespaceStackTop - 1];
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if (previousNs === NS.SVG && foreignContent.SVG_TAG_NAMES_ADJUSTMENT_MAP[tn])
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tn = foreignContent.SVG_TAG_NAMES_ADJUSTMENT_MAP[tn];
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//NOTE: check for exit from integration point
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if (foreignContent.isIntegrationPoint(tn, previousNs, token.attrs))
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this._leaveCurrentNamespace();
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}
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else if (tn === $.SVG && this.currentNamespace === NS.SVG ||
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tn === $.MATH && this.currentNamespace === NS.MATHML)
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this._leaveCurrentNamespace();
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// NOTE: adjust end tag name as well for consistency
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if (this.currentNamespace === NS.SVG)
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foreignContent.adjustTokenSVGTagName(token);
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};
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