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node_modules/parse5/lib/sax/index.js

@@ -0,0 +1,118 @@
+'use strict';
+
+var TransformStream = require('stream').Transform,
+    DevNullStream = require('./dev_null_stream'),
+    inherits = require('util').inherits,
+    Tokenizer = require('../tokenizer'),
+    LocationInfoTokenizerMixin = require('../extensions/location_info/tokenizer_mixin'),
+    ParserFeedbackSimulator = require('./parser_feedback_simulator'),
+    mergeOptions = require('../utils/merge_options');
+
+var DEFAULT_OPTIONS = {
+    locationInfo: false
+};
+
+var SAXParser = module.exports = function (options) {
+    TransformStream.call(this);
+
+    this.options = mergeOptions(DEFAULT_OPTIONS, options);
+
+    this.tokenizer = new Tokenizer(options);
+
+    if (this.options.locationInfo)
+        new LocationInfoTokenizerMixin(this.tokenizer);
+
+    this.parserFeedbackSimulator = new ParserFeedbackSimulator(this.tokenizer);
+
+    this.pendingText = null;
+    this.currentTokenLocation = void 0;
+
+    this.lastChunkWritten = false;
+    this.stopped = false;
+
+    // NOTE: always pipe stream to the /dev/null stream to avoid
+    // `highWaterMark` hit even if we don't have consumers.
+    // (see: https://github.com/inikulin/parse5/issues/97#issuecomment-171940774)
+    this.pipe(new DevNullStream());
+};
+
+inherits(SAXParser, TransformStream);
+
+//TransformStream implementation
+SAXParser.prototype._transform = function (chunk, encoding, callback) {
+    if (!this.stopped) {
+        this.tokenizer.write(chunk.toString('utf8'), this.lastChunkWritten);
+        this._runParsingLoop();
+    }
+
+    this.push(chunk);
+
+    callback();
+};
+
+SAXParser.prototype._flush = function (callback) {
+    callback();
+};
+
+SAXParser.prototype.end = function (chunk, encoding, callback) {
+    this.lastChunkWritten = true;
+    TransformStream.prototype.end.call(this, chunk, encoding, callback);
+};
+
+SAXParser.prototype.stop = function () {
+    this.stopped = true;
+};
+
+//Internals
+SAXParser.prototype._runParsingLoop = function () {
+    do {
+        var token = this.parserFeedbackSimulator.getNextToken();
+
+        if (token.type === Tokenizer.HIBERNATION_TOKEN)
+            break;
+
+        if (token.type === Tokenizer.CHARACTER_TOKEN ||
+            token.type === Tokenizer.WHITESPACE_CHARACTER_TOKEN ||
+            token.type === Tokenizer.NULL_CHARACTER_TOKEN) {
+
+            if (this.options.locationInfo) {
+                if (this.pendingText === null)
+                    this.currentTokenLocation = token.location;
+
+                else
+                    this.currentTokenLocation.endOffset = token.location.endOffset;
+            }
+
+            this.pendingText = (this.pendingText || '') + token.chars;
+        }
+
+        else {
+            this._emitPendingText();
+            this._handleToken(token);
+        }
+    } while (!this.stopped && token.type !== Tokenizer.EOF_TOKEN);
+};
+
+SAXParser.prototype._handleToken = function (token) {
+    if (this.options.locationInfo)
+        this.currentTokenLocation = token.location;
+
+    if (token.type === Tokenizer.START_TAG_TOKEN)
+        this.emit('startTag', token.tagName, token.attrs, token.selfClosing, this.currentTokenLocation);
+
+    else if (token.type === Tokenizer.END_TAG_TOKEN)
+        this.emit('endTag', token.tagName, this.currentTokenLocation);
+
+    else if (token.type === Tokenizer.COMMENT_TOKEN)
+        this.emit('comment', token.data, this.currentTokenLocation);
+
+    else if (token.type === Tokenizer.DOCTYPE_TOKEN)
+        this.emit('doctype', token.name, token.publicId, token.systemId, this.currentTokenLocation);
+};
+
+SAXParser.prototype._emitPendingText = function () {
+    if (this.pendingText !== null) {
+        this.emit('text', this.pendingText, this.currentTokenLocation);
+        this.pendingText = null;
+    }
+};