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Viewing file:     haskell.js (3.46 KB)      -rw-r--r--

/*
Language: Haskell
Author: Jeremy Hull <sourdrums@gmail.com>
Contributors: Zena Treep <zena.treep@gmail.com>
Website: https://www.haskell.org
Category: functional
*/

function haskell(hljs) {
  const COMMENT = {
    variants: [
      hljs.COMMENT('--', '$'),
      hljs.COMMENT(
        /\{-/,
        /-\}/,
        {
          contains: ['self']
        }
      )
    ]
  };

  const PRAGMA = {
    className: 'meta',
    begin: /\{-#/,
    end: /#-\}/
  };

  const PREPROCESSOR = {
    className: 'meta',
    begin: '^#',
    end: '$'
  };

  const CONSTRUCTOR = {
    className: 'type',
    begin: '\\b[A-Z][\\w\']*', // TODO: other constructors (build-in, infix).
    relevance: 0
  };

  const LIST = {
    begin: '\\(',
    end: '\\)',
    illegal: '"',
    contains: [
      PRAGMA,
      PREPROCESSOR,
      {
        className: 'type',
        begin: '\\b[A-Z][\\w]*(\\((\\.\\.|,|\\w+)\\))?'
      },
      hljs.inherit(hljs.TITLE_MODE, {
        begin: '[_a-z][\\w\']*'
      }),
      COMMENT
    ]
  };

  const RECORD = {
    begin: /\{/,
    end: /\}/,
    contains: LIST.contains
  };

  return {
    name: 'Haskell',
    aliases: ['hs'],
    keywords:
      'let in if then else case of where do module import hiding ' +
      'qualified type data newtype deriving class instance as default ' +
      'infix infixl infixr foreign export ccall stdcall cplusplus ' +
      'jvm dotnet safe unsafe family forall mdo proc rec',
    contains: [
      // Top-level constructions.
      {
        beginKeywords: 'module',
        end: 'where',
        keywords: 'module where',
        contains: [
          LIST,
          COMMENT
        ],
        illegal: '\\W\\.|;'
      },
      {
        begin: '\\bimport\\b',
        end: '$',
        keywords: 'import qualified as hiding',
        contains: [
          LIST,
          COMMENT
        ],
        illegal: '\\W\\.|;'
      },
      {
        className: 'class',
        begin: '^(\\s*)?(class|instance)\\b',
        end: 'where',
        keywords: 'class family instance where',
        contains: [
          CONSTRUCTOR,
          LIST,
          COMMENT
        ]
      },
      {
        className: 'class',
        begin: '\\b(data|(new)?type)\\b',
        end: '$',
        keywords: 'data family type newtype deriving',
        contains: [
          PRAGMA,
          CONSTRUCTOR,
          LIST,
          RECORD,
          COMMENT
        ]
      },
      {
        beginKeywords: 'default',
        end: '$',
        contains: [
          CONSTRUCTOR,
          LIST,
          COMMENT
        ]
      },
      {
        beginKeywords: 'infix infixl infixr',
        end: '$',
        contains: [
          hljs.C_NUMBER_MODE,
          COMMENT
        ]
      },
      {
        begin: '\\bforeign\\b',
        end: '$',
        keywords: 'foreign import export ccall stdcall cplusplus jvm ' +
                  'dotnet safe unsafe',
        contains: [
          CONSTRUCTOR,
          hljs.QUOTE_STRING_MODE,
          COMMENT
        ]
      },
      {
        className: 'meta',
        begin: '#!\\/usr\\/bin\\/env\ runhaskell',
        end: '$'
      },
      // "Whitespaces".
      PRAGMA,
      PREPROCESSOR,

      // Literals and names.

      // TODO: characters.
      hljs.QUOTE_STRING_MODE,
      hljs.C_NUMBER_MODE,
      CONSTRUCTOR,
      hljs.inherit(hljs.TITLE_MODE, {
        begin: '^[_a-z][\\w\']*'
      }),
      COMMENT,
      { // No markup, relevance booster
        begin: '->|<-'
      }
    ]
  };
}

module.exports = haskell;