module.exports = function(hljs) {
  var IDENT_RE = '[a-zA-Z_$][a-zA-Z0-9_$]*';
  var IDENT_FUNC_RETURN_TYPE_RE = '([*]|[a-zA-Z_$][a-zA-Z0-9_$]*)';

  var AS3_REST_ARG_MODE = {
    className: 'rest_arg',
    begin: '[.]{3}', end: IDENT_RE,
    relevance: 10
  };

  return {
    aliases: ['as'],
    keywords: {
      keyword: 'as break case catch class const continue default delete do dynamic each ' +
        'else extends final finally for function get if implements import in include ' +
        'instanceof interface internal is namespace native new override package private ' +
        'protected public return set static super switch this throw try typeof use var void ' +
        'while with',
      literal: 'true false null undefined'
    },
    contains: [
      hljs.APOS_STRING_MODE,
      hljs.QUOTE_STRING_MODE,
      hljs.C_LINE_COMMENT_MODE,
      hljs.C_BLOCK_COMMENT_MODE,
      hljs.C_NUMBER_MODE,
      {
        className: 'package',
        beginKeywords: 'package', end: '{',
        contains: [hljs.TITLE_MODE]
      },
      {
        className: 'class',
        beginKeywords: 'class interface', end: '{', excludeEnd: true,
        contains: [
          {
            beginKeywords: 'extends implements'
          },
          hljs.TITLE_MODE
        ]
      },
      {
        className: 'preprocessor',
        beginKeywords: 'import include', end: ';'
      },
      {
        className: 'function',
        beginKeywords: 'function', end: '[{;]', excludeEnd: true,
        illegal: '\\S',
        contains: [
          hljs.TITLE_MODE,
          {
            className: 'params',
            begin: '\\(', end: '\\)',
            contains: [
              hljs.APOS_STRING_MODE,
              hljs.QUOTE_STRING_MODE,
              hljs.C_LINE_COMMENT_MODE,
              hljs.C_BLOCK_COMMENT_MODE,
              AS3_REST_ARG_MODE
            ]
          },
          {
            className: 'type',
            begin: ':',
            end: IDENT_FUNC_RETURN_TYPE_RE,
            relevance: 10
          }
        ]
      }
    ],
    illegal: /#/
  };
};