// Copyright (C) 2008 Google Inc.
  //
  // 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
   * Registers a language handler for OCaml, SML, F# and similar languages.
   *
   * Based on the lexical grammar at
   * http://research.microsoft.com/en-us/um/cambridge/projects/fsharp/manual/spec.html#_Toc270597388
   *
   * @author mikesamuel@gmail.com
   */
  
  PR['registerLangHandler'](
      PR['createSimpleLexer'](
          [
           // Whitespace is made up of spaces, tabs and newline characters.
           [PR['PR_PLAIN'],       /^[\t
  \r \xA0]+/, null, '\t
  \r \xA0'],
           // #if ident/#else/#endif directives delimit conditional compilation
           // sections
           [PR['PR_COMMENT'],
            /^#(?:if[\t
  \r \xA0]+(?:[a-z_$][\w\']*|``[^\r
  \t`]*(?:``|$))|else|endif|light)/i,
            null, '#'],
           // A double or single quoted, possibly multi-line, string.
           // F# allows escaped newlines in strings.
           [PR['PR_STRING'],      /^(?:\"(?:[^\"\\]|\\[\s\S])*(?:\"|$)|\'(?:[^\'\\]|\\[\s\S])(?:\'|$))/, null, '"\'']
          ],
          [
           // Block comments are delimited by (* and *) and may be
           // nested. Single-line comments begin with // and extend to
           // the end of a line.
           // TODO: (*...*) comments can be nested.  This does not handle that.
           [PR['PR_COMMENT'],     /^(?:\/\/[^\r
  ]*|\(\*[\s\S]*?\*\))/],
           [PR['PR_KEYWORD'],     /^(?:abstract|and|as|assert|begin|class|default|delegate|do|done|downcast|downto|elif|else|end|exception|extern|false|finally|for|fun|function|if|in|inherit|inline|interface|internal|lazy|let|match|member|module|mutable|namespace|new|null|of|open|or|override|private|public|rec|return|static|struct|then|to|true|try|type|upcast|use|val|void|when|while|with|yield|asr|land|lor|lsl|lsr|lxor|mod|sig|atomic|break|checked|component|const|constraint|constructor|continue|eager|event|external|fixed|functor|global|include|method|mixin|object|parallel|process|protected|pure|sealed|trait|virtual|volatile)\b/],
           // A number is a hex integer literal, a decimal real literal, or in
           // scientific notation.
           [PR['PR_LITERAL'],
            /^[+\-]?(?:0x[\da-f]+|(?:(?:\.\d+|\d+(?:\.\d*)?)(?:e[+\-]?\d+)?))/i],
           [PR['PR_PLAIN'],       /^(?:[a-z_][\w']*[!?#]?|``[^\r
  \t`]*(?:``|$))/i],
           // A printable non-space non-special character
           [PR['PR_PUNCTUATION'], /^[^\t
  \r \xA0\"\'\w]+/]
          ]),
      ['fs', 'ml']);