text: /*
  Language: Elm
  Author: Janis Voigtlaender <janis.voigtlaender@gmail.com>
  Category: functional
  */
  
  function(hljs) {
    var COMMENT = {
      variants: [
        hljs.COMMENT('--', '$'),
        hljs.COMMENT(
          '{-',
          '-}',
          {
            contains: ['self']
          }
        )
      ]
    };
  
    var CONSTRUCTOR = {
      className: 'type',
      begin: '\\b[A-Z][\\w\']*', // TODO: other constructors (built-in, infix).
      relevance: 0
    };
  
    var LIST = {
      begin: '\\(', end: '\\)',
      illegal: '"',
      contains: [
        {className: 'type', begin: '\\b[A-Z][\\w]*(\\((\\.\\.|,|\\w+)\\))?'},
        COMMENT
      ]
    };
  
    var RECORD = {
      begin: '{', end: '}',
      contains: LIST.contains
    };
  
    return {
      keywords:
        'let in if then else case of where module import exposing ' +
        'type alias as infix infixl infixr port effect command',
      contains: [
  
        // Top-level constructions.
  
        {
          beginKeywords: 'port effect module', end: 'exposing',
          keywords: 'port effect module where command exposing',
          contains: [LIST, COMMENT],
          illegal: '\\W\\.|;'
        },
        {
          begin: 'import', end: '$',
          keywords: 'import as exposing',
          contains: [LIST, COMMENT],
          illegal: '\\W\\.|;'
        },
        {
          begin: 'type', end: '$',
          keywords: 'type alias',
          contains: [CONSTRUCTOR, LIST, RECORD, COMMENT]
        },
        {
          beginKeywords: 'infix infixl infixr', end: '$',
          contains: [hljs.C_NUMBER_MODE, COMMENT]
        },
        {
          begin: 'port', end: '$',
          keywords: 'port',
          contains: [COMMENT]
        },
  
        // Literals and names.
  
        // TODO: characters.
        hljs.QUOTE_STRING_MODE,
        hljs.C_NUMBER_MODE,
        CONSTRUCTOR,
        hljs.inherit(hljs.TITLE_MODE, {begin: '^[_a-z][\\w\']*'}),
        COMMENT,
  
        {begin: '->|<-'} // No markup, relevance booster
      ]
    };
  }
  