tokenizer.js

/*jshint node:true */
/*

  The MIT License (MIT)

  Copyright (c) 2007-2018 Einar Lielmanis, Liam Newman, and contributors.

  Permission is hereby granted, free of charge, to any person
  obtaining a copy of this software and associated documentation files
  (the "Software"), to deal in the Software without restriction,
  including without limitation the rights to use, copy, modify, merge,
  publish, distribute, sublicense, and/or sell copies of the Software,
  and to permit persons to whom the Software is furnished to do so,
  subject to the following conditions:

  The above copyright notice and this permission notice shall be
  included in all copies or substantial portions of the Software.

  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  SOFTWARE.
*/

'use strict';

var BaseTokenizer = require('../core/tokenizer').Tokenizer;
var BASETOKEN = require('../core/tokenizer').TOKEN;
var Directives = require('../core/directives').Directives;
var TemplatablePattern = require('../core/templatablepattern').TemplatablePattern;
var Pattern = require('../core/pattern').Pattern;

var TOKEN = {
  TAG_OPEN: 'TK_TAG_OPEN',
  TAG_CLOSE: 'TK_TAG_CLOSE',
  ATTRIBUTE: 'TK_ATTRIBUTE',
  EQUALS: 'TK_EQUALS',
  VALUE: 'TK_VALUE',
  COMMENT: 'TK_COMMENT',
  TEXT: 'TK_TEXT',
  UNKNOWN: 'TK_UNKNOWN',
  START: BASETOKEN.START,
  RAW: BASETOKEN.RAW,
  EOF: BASETOKEN.EOF
};

var directives_core = new Directives(/<\!--/, /-->/);

var Tokenizer = function(input_string, options) {
  BaseTokenizer.call(this, input_string, options);
  this._current_tag_name = '';

  // Words end at whitespace or when a tag starts
  // if we are indenting handlebars, they are considered tags
  var templatable_reader = new TemplatablePattern(this._input);
  var pattern_reader = new Pattern(this._input);

  this.__patterns = {
    word: templatable_reader.until(/[\n\r\t <]/),
    single_quote: templatable_reader.until_after(/'/),
    double_quote: templatable_reader.until_after(/"/),
    attribute: templatable_reader.until(/[\n\r\t =\/>]/),
    element_name: templatable_reader.until(/[\n\r\t >\/]/),

    handlebars_comment: pattern_reader.starting_with(/{{!--/).until_after(/--}}/),
    handlebars: pattern_reader.starting_with(/{{/).until_after(/}}/),
    handlebars_open: pattern_reader.until(/[\n\r\t }]/),
    handlebars_raw_close: pattern_reader.until(/}}/),
    comment: pattern_reader.starting_with(/<!--/).until_after(/-->/),
    cdata: pattern_reader.starting_with(/<!\[cdata\[/).until_after(/]]>/),
    // https://en.wikipedia.org/wiki/Conditional_comment
    conditional_comment: pattern_reader.starting_with(/<!\[/).until_after(/]>/),
    processing: pattern_reader.starting_with(/<\?/).until_after(/\?>/)
  };

  if (this._options.indent_handlebars) {
    this.__patterns.word = this.__patterns.word.exclude('handlebars');
  }

  this._unformatted_content_delimiter = null;

  if (this._options.unformatted_content_delimiter) {
    var literal_regexp = this._input.get_literal_regexp(this._options.unformatted_content_delimiter);
    this.__patterns.unformatted_content_delimiter =
      pattern_reader.matching(literal_regexp)
      .until_after(literal_regexp);
  }
};
Tokenizer.prototype = new BaseTokenizer();

Tokenizer.prototype._is_comment = function(current_token) { // jshint unused:false
  return false; //current_token.type === TOKEN.COMMENT || current_token.type === TOKEN.UNKNOWN;
};

Tokenizer.prototype._is_opening = function(current_token) {
  return current_token.type === TOKEN.TAG_OPEN;
};

Tokenizer.prototype._is_closing = function(current_token, open_token) {
  return current_token.type === TOKEN.TAG_CLOSE &&
    (open_token && (
      ((current_token.text === '>' || current_token.text === '/>') && open_token.text[0] === '<') ||
      (current_token.text === '}}' && open_token.text[0] === '{' && open_token.text[1] === '{')));
};

Tokenizer.prototype._reset = function() {
  this._current_tag_name = '';
};

Tokenizer.prototype._get_next_token = function(previous_token, open_token) { // jshint unused:false
  var token = null;
  this._readWhitespace();
  var c = this._input.peek();

  if (c === null) {
    return this._create_token(TOKEN.EOF, '');
  }

  token = token || this._read_open_handlebars(c, open_token);
  token = token || this._read_attribute(c, previous_token, open_token);
  token = token || this._read_raw_content(previous_token, open_token);
  token = token || this._read_close(c, open_token);
  token = token || this._read_content_word(c);
  token = token || this._read_comment(c);
  token = token || this._read_open(c, open_token);
  token = token || this._create_token(TOKEN.UNKNOWN, this._input.next());

  return token;
};

Tokenizer.prototype._read_comment = function(c) { // jshint unused:false
  var token = null;
  var resulting_string = null;
  var directives = null;

  if (c === '<') {
    var peek1 = this._input.peek(1);
    //if we're in a comment, do something special
    // We treat all comments as literals, even more than preformatted tags
    // we just look for the appropriate close tag
    if (c === '<' && (peek1 === '!' || peek1 === '?')) {
      resulting_string = this.__patterns.comment.read();

      // only process directive on html comments
      if (resulting_string) {
        directives = directives_core.get_directives(resulting_string);
        if (directives && directives.ignore === 'start') {
          resulting_string += directives_core.readIgnored(this._input);
        }
      } else {
        resulting_string = this.__patterns.cdata.read();
        resulting_string = resulting_string || this.__patterns.conditional_comment.read();
        resulting_string = resulting_string || this.__patterns.processing.read();
      }
    }

    if (resulting_string) {
      token = this._create_token(TOKEN.COMMENT, resulting_string);
      token.directives = directives;
    }
  }

  return token;
};

Tokenizer.prototype._read_open = function(c, open_token) {
  var resulting_string = null;
  var token = null;
  if (!open_token) {
    if (c === '<') {

      resulting_string = this._input.next();
      if (this._input.peek() === '/') {
        resulting_string += this._input.next();
      }
      resulting_string += this.__patterns.element_name.read();
      token = this._create_token(TOKEN.TAG_OPEN, resulting_string);
    }
  }
  return token;
};

Tokenizer.prototype._read_open_handlebars = function(c, open_token) {
  var resulting_string = null;
  var token = null;
  if (!open_token) {
    if (this._options.indent_handlebars && c === '{' && this._input.peek(1) === '{') {
      if (this._input.peek(2) === '!') {
        resulting_string = this.__patterns.handlebars_comment.read();
        resulting_string = resulting_string || this.__patterns.handlebars.read();
        token = this._create_token(TOKEN.COMMENT, resulting_string);
      } else {
        resulting_string = this.__patterns.handlebars_open.read();
        token = this._create_token(TOKEN.TAG_OPEN, resulting_string);
      }
    }
  }
  return token;
};


Tokenizer.prototype._read_close = function(c, open_token) {
  var resulting_string = null;
  var token = null;
  if (open_token) {
    if (open_token.text[0] === '<' && (c === '>' || (c === '/' && this._input.peek(1) === '>'))) {
      resulting_string = this._input.next();
      if (c === '/') { //  for close tag "/>"
        resulting_string += this._input.next();
      }
      token = this._create_token(TOKEN.TAG_CLOSE, resulting_string);
    } else if (open_token.text[0] === '{' && c === '}' && this._input.peek(1) === '}') {
      this._input.next();
      this._input.next();
      token = this._create_token(TOKEN.TAG_CLOSE, '}}');
    }
  }

  return token;
};

Tokenizer.prototype._read_attribute = function(c, previous_token, open_token) {
  var token = null;
  var resulting_string = '';
  if (open_token && open_token.text[0] === '<') {

    if (c === '=') {
      token = this._create_token(TOKEN.EQUALS, this._input.next());
    } else if (c === '"' || c === "'") {
      var content = this._input.next();
      if (c === '"') {
        content += this.__patterns.double_quote.read();
      } else {
        content += this.__patterns.single_quote.read();
      }
      token = this._create_token(TOKEN.VALUE, content);
    } else {
      resulting_string = this.__patterns.attribute.read();

      if (resulting_string) {
        if (previous_token.type === TOKEN.EQUALS) {
          token = this._create_token(TOKEN.VALUE, resulting_string);
        } else {
          token = this._create_token(TOKEN.ATTRIBUTE, resulting_string);
        }
      }
    }
  }
  return token;
};

Tokenizer.prototype._is_content_unformatted = function(tag_name) {
  // void_elements have no content and so cannot have unformatted content
  // script and style tags should always be read as unformatted content
  // finally content_unformatted and unformatted element contents are unformatted
  return this._options.void_elements.indexOf(tag_name) === -1 &&
    (tag_name === 'script' || tag_name === 'style' ||
      this._options.content_unformatted.indexOf(tag_name) !== -1 ||
      this._options.unformatted.indexOf(tag_name) !== -1);
};


Tokenizer.prototype._read_raw_content = function(previous_token, open_token) { // jshint unused:false
  var resulting_string = '';
  if (open_token && open_token.text[0] === '{') {
    resulting_string = this.__patterns.handlebars_raw_close.read();
  } else if (previous_token.type === TOKEN.TAG_CLOSE && (previous_token.opened.text[0] === '<')) {
    var tag_name = previous_token.opened.text.substr(1).toLowerCase();
    if (this._is_content_unformatted(tag_name)) {
      resulting_string = this._input.readUntil(new RegExp('</' + tag_name + '[\\n\\r\\t ]*?>', 'ig'));
    }
  }

  if (resulting_string) {
    return this._create_token(TOKEN.TEXT, resulting_string);
  }

  return null;
};

Tokenizer.prototype._read_content_word = function(c) {
  var resulting_string = '';
  if (this._options.unformatted_content_delimiter) {
    if (c === this._options.unformatted_content_delimiter[0]) {
      resulting_string = this.__patterns.unformatted_content_delimiter.read();
    }
  }

  if (!resulting_string) {
    resulting_string = this.__patterns.word.read();
  }
  if (resulting_string) {
    return this._create_token(TOKEN.TEXT, resulting_string);
  }
};

module.exports.Tokenizer = Tokenizer;
module.exports.TOKEN = TOKEN;