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/*
Language: LiveScript
Author: Taneli Vatanen <taneli.vatanen@gmail.com>
Contributors: Jen Evers-Corvina <jen@sevvie.net>
Origin: coffeescript.js
Description: LiveScript is a programming language that transcompiles to JavaScript. For info about language see http://livescript.net/
Website: https://livescript.net
Category: scripting
*/

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

export default function(hljs) {
  var LIVESCRIPT_BUILT_INS = [
    'npm',
    'print'
  ];
  var LIVESCRIPT_LITERALS = [
    'yes',
    'no',
    'on',
    'off',
    'it',
    'that',
    'void'
  ];
  var LIVESCRIPT_KEYWORDS = [
    'then',
    'unless',
    'until',
    'loop',
    'of',
    'by',
    'when',
    'and',
    'or',
    'is',
    'isnt',
    'not',
    'it',
    'that',
    'otherwise',
    'from',
    'to',
    'til',
    'fallthrough',
    'case',
    'enum',
    'native',
    'list',
    'map',
    '__hasProp',
    '__extends',
    '__slice',
    '__bind',
    '__indexOf'
  ];
  var KEYWORDS = {
    keyword: ECMAScript.KEYWORDS.concat(LIVESCRIPT_KEYWORDS).join(" "),
    literal: ECMAScript.LITERALS.concat(LIVESCRIPT_LITERALS).join(" "),
    built_in: ECMAScript.BUILT_INS.concat(LIVESCRIPT_BUILT_INS).join(" ")
  };
  var JS_IDENT_RE = '[A-Za-z$_](?:\-[0-9A-Za-z$_]|[0-9A-Za-z$_])*';
  var TITLE = hljs.inherit(hljs.TITLE_MODE, {begin: JS_IDENT_RE});
  var SUBST = {
    className: 'subst',
    begin: /#\{/, end: /}/,
    keywords: KEYWORDS
  };
  var SUBST_SIMPLE = {
    className: 'subst',
    begin: /#[A-Za-z$_]/, end: /(?:\-[0-9A-Za-z$_]|[0-9A-Za-z$_])*/,
    keywords: KEYWORDS
  };
  var EXPRESSIONS = [
    hljs.BINARY_NUMBER_MODE,
    {
      className: 'number',
      begin: '(\\b0[xX][a-fA-F0-9_]+)|(\\b\\d(\\d|_\\d)*(\\.(\\d(\\d|_\\d)*)?)?(_*[eE]([-+]\\d(_\\d|\\d)*)?)?[_a-z]*)',
      relevance: 0,
      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, SUBST_SIMPLE]
        },
        {
          begin: /"/, end: /"/,
          contains: [hljs.BACKSLASH_ESCAPE, SUBST, SUBST_SIMPLE]
        },
        {
          begin: /\\/, end: /(\s|$)/,
          excludeEnd: true
        }
      ]
    },
    {
      className: 'regexp',
      variants: [
        {
          begin: '//', end: '//[gim]*',
          contains: [SUBST, hljs.HASH_COMMENT_MODE]
        },
        {
          // 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]*(?=\W)/
        }
      ]
    },
    {
      begin: '@' + JS_IDENT_RE
    },
    {
      begin: '``', end: '``',
      excludeBegin: true, excludeEnd: true,
      subLanguage: 'javascript'
    }
  ];
  SUBST.contains = EXPRESSIONS;

var PARAMS = {
    className: 'params',
    begin: '\$', returnBegin: true,
    /* We need another contained nameless mode to not have every nested
    pair of parens to be called "params" */
    contains: [
      {
        begin: /\(/, end: /$/,
        keywords: KEYWORDS,
        contains: ['self'].concat(EXPRESSIONS)
      }
    ]
  };

var SYMBOLS = {
    begin: '(#=>|=>|\\|>>|-?->|\\!->)'
  };

return {
    name: 'LiveScript',
    aliases: ['ls'],
    keywords: KEYWORDS,
    illegal: /\/\*/,
    contains: EXPRESSIONS.concat([
      hljs.COMMENT('\\/\\*', '\\*\\/'),
      hljs.HASH_COMMENT_MODE,
      SYMBOLS, // relevance booster
      {
        className: 'function',
        contains: [TITLE, PARAMS],
        returnBegin: true,
        variants: [
          {
            begin: '(' + JS_IDENT_RE + '\\s*(?:=|:=)\\s*)?(\$.*\$)?\\s*\\B\\->\\*?', end: '\\->\\*?'
          },
          {
            begin: '(' + JS_IDENT_RE + '\\s*(?:=|:=)\\s*)?!?(\$.*\$)?\\s*\\B[-~]{1,2}>\\*?', end: '[-~]{1,2}>\\*?'
          },
          {
            begin: '(' + JS_IDENT_RE + '\\s*(?:=|:=)\\s*)?(\$.*\$)?\\s*\\B!?[-~]{1,2}>\\*?', end: '!?[-~]{1,2}>\\*?'
          }
        ]
      },
      {
        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
      }
    ])
  };
}