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/*
Language: CoffeeScript
Author: Dmytrii Nagirniak <dnagir@gmail.com>
Contributors: Oleg Efimov <efimovov@gmail.com>, Cédric Néhémie <cedric.nehemie@gmail.com>
Description: CoffeeScript is a programming language that transcompiles to JavaScript. For info about language see http://coffeescript.org/
Category: common, scripting
Website: https://coffeescript.org
*/

import * as ECMAScript from "./lib/ecmascript";

export default function(hljs) {
  var COFFEE_BUILT_INS = [
    'npm',
    'print'
  ];
  var COFFEE_LITERALS = [
    'yes',
    'no',
    'on',
    'off'
  ];
  var COFFEE_KEYWORDS = [
    'then',
    'unless',
    'until',
    'loop',
    'by',
    'when',
    'and',
    'or',
    'is',
    'isnt',
    'not'
  ];
  var NOT_VALID_KEYWORDS = [
    "var",
    "const",
    "let",
    "function",
    "static"
  ];
  var excluding = (list) =>
    (kw) => !list.includes(kw);
  var KEYWORDS = {
    keyword: ECMAScript.KEYWORDS.concat(COFFEE_KEYWORDS).filter(excluding(NOT_VALID_KEYWORDS)).join(" "),
    literal: ECMAScript.LITERALS.concat(COFFEE_LITERALS).join(" "),
    built_in: ECMAScript.BUILT_INS.concat(COFFEE_BUILT_INS).join(" ")
  };
  var JS_IDENT_RE = '[A-Za-z$_][0-9A-Za-z$_]*';
  var SUBST = {
    className: 'subst',
    begin: /#\{/, end: /}/,
    keywords: KEYWORDS
  };
  var EXPRESSIONS = [
    hljs.BINARY_NUMBER_MODE,
    hljs.inherit(hljs.C_NUMBER_MODE, {starts: {end: '(\\s*/)?', relevance: 0}}), // a number tries to eat the following slash to prevent treating it as a regexp
    {
      className: 'string',
      variants: [
        {
          begin: /'''/, end: /'''/,
          contains: [hljs.BACKSLASH_ESCAPE]
        },
        {
          begin: /'/, end: /'/,
          contains: [hljs.BACKSLASH_ESCAPE]
        },
        {
          begin: /"""/, end: /"""/,
          contains: [hljs.BACKSLASH_ESCAPE, SUBST]
        },
        {
          begin: /"/, end: /"/,
          contains: [hljs.BACKSLASH_ESCAPE, SUBST]
        }
      ]
    },
    {
      className: 'regexp',
      variants: [
        {
          begin: '///', end: '///',
          contains: [SUBST, hljs.HASH_COMMENT_MODE]
        },
        {
          begin: '//[gim]{0,3}(?=\\W)',
          relevance: 0
        },
        {
          // regex can't start with space to parse x / 2 / 3 as two divisions
          // regex can't start with *, and it supports an "illegal" in the main mode
          begin: /\/(?![ *]).*?(?![\\]).\/[gim]{0,3}(?=\W)/
        }
      ]
    },
    {
      begin: '@' + JS_IDENT_RE // relevance booster
    },
    {
      subLanguage: 'javascript',
      excludeBegin: true, excludeEnd: true,
      variants: [
        {
          begin: '```', end: '```',
        },
        {
          begin: '`', end: '`',
        }
      ]
    }
  ];
  SUBST.contains = EXPRESSIONS;

return {
    name: 'CoffeeScript',
    aliases: ['coffee', 'cson', 'iced'],
    keywords: KEYWORDS,
    illegal: /\/\*/,
    contains: EXPRESSIONS.concat([
      hljs.COMMENT('###', '###'),
      hljs.HASH_COMMENT_MODE,
      {
        className: 'function',
        begin: '^\\s*' + JS_IDENT_RE + '\\s*=\\s*' + PARAMS_RE, end: '[-=]>',
        returnBegin: true,
        contains: [TITLE, PARAMS]
      },
      {
        // anonymous function start
        begin: /[:\(,=]\s*/,
        relevance: 0,
        contains: [
          {
            className: 'function',
            begin: PARAMS_RE, end: '[-=]>',
            returnBegin: true,
            contains: [PARAMS]
          }
        ]
      },
      {
        className: 'class',
        beginKeywords: 'class',
        end: '$',
        illegal: /[:="\[\]]/,
        contains: [
          {
            beginKeywords: 'extends',
            endsWithParent: true,
            illegal: /[:="\[\]]/,
            contains: [TITLE]
          },
          TITLE
        ]
      },
      {
        begin: JS_IDENT_RE + ':', end: ':',
        returnBegin: true, returnEnd: true,
        relevance: 0
      }
    ])
  };
}