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Viewing file:     vhdl.js (2.87 KB)      -rw-r--r--

/*
Language: VHDL
Author: Igor Kalnitsky <igor@kalnitsky.org>
Contributors: Daniel C.K. Kho <daniel.kho@tauhop.com>, Guillaume Savaton <guillaume.savaton@eseo.fr>
Description: VHDL is a hardware description language used in electronic design automation to describe digital and mixed-signal systems.
Website: https://en.wikipedia.org/wiki/VHDL
*/

function vhdl(hljs) {
  // Regular expression for VHDL numeric literals.

  // Decimal literal:
  const INTEGER_RE = '\\d(_|\\d)*';
  const EXPONENT_RE = '[eE][-+]?' + INTEGER_RE;
  const DECIMAL_LITERAL_RE = INTEGER_RE + '(\\.' + INTEGER_RE + ')?' + '(' + EXPONENT_RE + ')?';
  // Based literal:
  const BASED_INTEGER_RE = '\\w+';
  const BASED_LITERAL_RE = INTEGER_RE + '#' + BASED_INTEGER_RE + '(\\.' + BASED_INTEGER_RE + ')?' + '#' + '(' + EXPONENT_RE + ')?';

  const NUMBER_RE = '\\b(' + BASED_LITERAL_RE + '|' + DECIMAL_LITERAL_RE + ')';

  return {
    name: 'VHDL',
    case_insensitive: true,
    keywords: {
      keyword:
        'abs access after alias all and architecture array assert assume assume_guarantee attribute ' +
        'begin block body buffer bus case component configuration constant context cover disconnect ' +
        'downto default else elsif end entity exit fairness file for force function generate ' +
        'generic group guarded if impure in inertial inout is label library linkage literal ' +
        'loop map mod nand new next nor not null of on open or others out package parameter port ' +
        'postponed procedure process property protected pure range record register reject ' +
        'release rem report restrict restrict_guarantee return rol ror select sequence ' +
        'severity shared signal sla sll sra srl strong subtype then to transport type ' +
        'unaffected units until use variable view vmode vprop vunit wait when while with xnor xor',
      built_in:
        'boolean bit character ' +
        'integer time delay_length natural positive ' +
        'string bit_vector file_open_kind file_open_status ' +
        'std_logic std_logic_vector unsigned signed boolean_vector integer_vector ' +
        'std_ulogic std_ulogic_vector unresolved_unsigned u_unsigned unresolved_signed u_signed ' +
        'real_vector time_vector',
      literal:
        'false true note warning error failure ' + // severity_level
        'line text side width' // textio
    },
    illegal: /\{/,
    contains: [
      hljs.C_BLOCK_COMMENT_MODE, // VHDL-2008 block commenting.
      hljs.COMMENT('--', '$'),
      hljs.QUOTE_STRING_MODE,
      {
        className: 'number',
        begin: NUMBER_RE,
        relevance: 0
      },
      {
        className: 'string',
        begin: '\'(U|X|0|1|Z|W|L|H|-)\'',
        contains: [ hljs.BACKSLASH_ESCAPE ]
      },
      {
        className: 'symbol',
        begin: '\'[A-Za-z](_?[A-Za-z0-9])*',
        contains: [ hljs.BACKSLASH_ESCAPE ]
      }
    ]
  };
}

module.exports = vhdl;