# all files / src/ HtmlParser.js

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     import * as supports from './supports';
    import * as streamReaders from './streamReaders';
    import fixedReadTokenFactory from './fixedReadTokenFactory';
    import {escapeQuotes} from './utils';

    /**
     * Detection regular expressions.
     *
     * Order of detection matters: detection of one can only
     * succeed if detection of previous didn't

     * @type {Object}
     */
    const detect = {
      comment: /^<!--/,
      endTag: /^<\//,
      atomicTag: /^<\s*(script|style|noscript|iframe|textarea)[\s\/>]/i,
      startTag: /^</,
      chars: /^[^<]/
    };

    /**
     * HtmlParser provides the capability to parse HTML and return tokens
     * representing the tags and content.
     */
    export default class HtmlParser {
      /**
       * Constructor.
       *
       * @param {string} stream The initial parse stream contents.
       * @param {Object} options The options
       * @param {boolean} options.autoFix Set to true to automatically fix errors
       */
      constructor(stream = '', options = {}) {
        this.stream = stream;

        let fix = false;
        const fixedTokenOptions = {};

        for (let key in supports) {
          Eif (supports.hasOwnProperty(key)) {
            if (options.autoFix) {
              fixedTokenOptions[`${key}Fix`] = true; // !supports[key];
            }
            fix = fix || fixedTokenOptions[`${key}Fix`];
          }
        }

        if (fix) {
          this._readToken = fixedReadTokenFactory(this, fixedTokenOptions, () => this._readTokenImpl());
          this._peekToken = fixedReadTokenFactory(this, fixedTokenOptions, () => this._peekTokenImpl());
        } else {
          this._readToken = this._readTokenImpl;
          this._peekToken = this._peekTokenImpl;
        }
      }

      /**
       * Appends the given string to the parse stream.
       *
       * @param {string} str The string to append
       */
      append(str) {
        this.stream += str;
      }

      /**
       * Prepends the given string to the parse stream.
       *
       * @param {string} str The string to prepend
       */
      prepend(str) {
        this.stream = str + this.stream;
      }

      /**
       * The implementation of the token reading.
       *
       * @private
       * @returns {?Token}
       */
      _readTokenImpl() {
        const token = this._peekTokenImpl();
        if (token) {
          this.stream = this.stream.slice(token.length);
          return token;
        }
      }

      /**
       * The implementation of token peeking.
       *
       * @returns {?Token}
       */
      _peekTokenImpl() {
        for (let type in detect) {
          Eif (detect.hasOwnProperty(type)) {
            if (detect[type].test(this.stream)) {
              const token = streamReaders[type](this.stream);

              if (token) {
                if (token.type === 'startTag' &&
                    (/script|style/i).test(token.tagName)) {
                  return null;
                } else {
                  token.text = this.stream.substr(0, token.length);
                  return token;
                }
              }
            }
          }
        }
      }

      /**
       * The public token peeking interface.  Delegates to the basic token peeking
       * or a version that performs fixups depending on the `autoFix` setting in
       * options.
       *
       * @returns {object}
       */
      peekToken() {
        return this._peekToken();
      }

      /**
       * The public token reading interface.  Delegates to the basic token reading
       * or a version that performs fixups depending on the `autoFix` setting in
       * options.
       *
       * @returns {object}
       */
      readToken() {
        return this._readToken();
      }

      /**
       * Read tokens and hand to the given handlers.
       *
       * @param {Object} handlers The handlers to use for the different tokens.
       */
      readTokens(handlers) {
        let tok;
        while ((tok = this.readToken())) {
          // continue until we get an explicit "false" return
          if (handlers[tok.type] && handlers[tok.type](tok) === false) {
            return;
          }
        }
      }

      /**
       * Clears the parse stream.
       *
       * @returns {string} The contents of the parse stream before clearing.
       */
      clear() {
        const rest = this.stream;
        this.stream = '';
        return rest;
      }

      /**
       * Returns the rest of the parse stream.
       *
       * @returns {string} The contents of the parse stream.
       */
      rest() {
        return this.stream;
      }
    }

    HtmlParser.tokenToString = tok => tok.toString();

    HtmlParser.escapeAttributes = attrs => {
      const escapedAttrs = {};

      for (let name in attrs) {
        if (attrs.hasOwnProperty(name)) {
          escapedAttrs[name] = escapeQuotes(attrs[name], null);
        }
      }

      return escapedAttrs;
    };

    HtmlParser.supports = supports;

    for (let key in supports) {
      Eif (supports.hasOwnProperty(key)) {
        HtmlParser.browserHasFlaw = HtmlParser.browserHasFlaw || (!supports[key]) && key;
      }
    }