// Copyright (C) 2011 Martin S.
  //
  // Licensed under the Apache License, Version 2.0 (the "License");
  // you may not use this file except in compliance with the License.
  // You may obtain a copy of the License at
  //
  //      http://www.apache.org/licenses/LICENSE-2.0
  //
  // Unless required by applicable law or agreed to in writing, software
  // distributed under the License is distributed on an "AS IS" BASIS,
  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  // See the License for the specific language governing permissions and
  // limitations under the License.
  
  /**
   * @fileoverview
   * Support for tex highlighting as discussed on
   * <a href="http://meta.tex.stackexchange.com/questions/872/text-immediate-following-double-backslashes-is-highlighted-as-macro-inside-a-code/876#876">meta.tex.stackexchange.com</a>.
   *
   * @author Martin S.
   */
  
  PR['registerLangHandler'](
      PR['createSimpleLexer'](
          [
           // whitespace
           [PR['PR_PLAIN'],   /^[\t
  \r \xA0]+/, null, '\t
  \r \xA0'],
           // all comments begin with '%'
           [PR['PR_COMMENT'], /^%[^\r
  ]*/, null, '%']
          ],
          [
           //[PR['PR_DECLARATION'], /^\\([egx]?def|(new|renew|provide)(command|environment))\b/],
           // any command starting with a \ and contains
           // either only letters (a-z,A-Z), '@' (internal macros)
           [PR['PR_KEYWORD'], /^\\[a-zA-Z@]+/],
           // or contains only one character
           [PR['PR_KEYWORD'], /^\\./],
           // Highlight dollar for math mode and ampersam for tabular
           [PR['PR_TYPE'],    /^[$&]/],
           // numeric measurement values with attached units
           [PR['PR_LITERAL'],
            /[+-]?(?:\.\d+|\d+(?:\.\d*)?)(cm|em|ex|in|pc|pt|bp|mm)/i],
           // punctuation usually occurring within commands
           [PR['PR_PUNCTUATION'], /^[{}()\[\]=]+/]
          ]),
      ['latex', 'tex']);