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/*
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;