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/*
Language: Erlang
Description: Erlang is a general-purpose functional language, with strict evaluation, single assignment, and dynamic typing.
Author: Nikolay Zakharov <nikolay.desh@gmail.com>, Dmitry Kovega <arhibot@gmail.com>
Website: https://www.erlang.org
Category: functional
*/
/** @type LanguageFn */
function erlang(hljs) {
const BASIC_ATOM_RE = '[a-z\'][a-zA-Z0-9_\']*';
const FUNCTION_NAME_RE = '(' + BASIC_ATOM_RE + ':' + BASIC_ATOM_RE + '|' + BASIC_ATOM_RE + ')';
const ERLANG_RESERVED = {
keyword:
'after and andalso|10 band begin bnot bor bsl bzr bxor case catch cond div end fun if ' +
'let not of orelse|10 query receive rem try when xor',
literal:
'false true'
};
const COMMENT = hljs.COMMENT('%', '$');
const NUMBER = {
className: 'number',
begin: '\\b(\\d+(_\\d+)*#[a-fA-F0-9]+(_[a-fA-F0-9]+)*|\\d+(_\\d+)*(\\.\\d+(_\\d+)*)?([eE][-+]?\\d+)?)',
relevance: 0
};
const NAMED_FUN = {
begin: 'fun\\s+' + BASIC_ATOM_RE + '/\\d+'
};
const FUNCTION_CALL = {
begin: FUNCTION_NAME_RE + '\\(',
end: '\\)',
returnBegin: true,
relevance: 0,
contains: [
{
begin: FUNCTION_NAME_RE,
relevance: 0
},
{
begin: '\\(',
end: '\\)',
endsWithParent: true,
returnEnd: true,
relevance: 0
// "contains" defined later
}
]
};
const TUPLE = {
begin: /\{/,
end: /\}/,
relevance: 0
// "contains" defined later
};
const VAR1 = {
begin: '\\b_([A-Z][A-Za-z0-9_]*)?',
relevance: 0
};
const VAR2 = {
begin: '[A-Z][a-zA-Z0-9_]*',
relevance: 0
};
const RECORD_ACCESS = {
begin: '#' + hljs.UNDERSCORE_IDENT_RE,
relevance: 0,
returnBegin: true,
contains: [
{
begin: '#' + hljs.UNDERSCORE_IDENT_RE,
relevance: 0
},
{
begin: /\{/,
end: /\}/,
relevance: 0
// "contains" defined later
}
]
};
const BLOCK_STATEMENTS = {
beginKeywords: 'fun receive if try case',
end: 'end',
keywords: ERLANG_RESERVED
};
BLOCK_STATEMENTS.contains = [
COMMENT,
NAMED_FUN,
hljs.inherit(hljs.APOS_STRING_MODE, {
className: ''
}),
BLOCK_STATEMENTS,
FUNCTION_CALL,
hljs.QUOTE_STRING_MODE,
NUMBER,
TUPLE,
VAR1,
VAR2,
RECORD_ACCESS
];
const BASIC_MODES = [
COMMENT,
NAMED_FUN,
BLOCK_STATEMENTS,
FUNCTION_CALL,
hljs.QUOTE_STRING_MODE,
NUMBER,
TUPLE,
VAR1,
VAR2,
RECORD_ACCESS
];
FUNCTION_CALL.contains[1].contains = BASIC_MODES;
TUPLE.contains = BASIC_MODES;
RECORD_ACCESS.contains[1].contains = BASIC_MODES;
const PARAMS = {
className: 'params',
begin: '\\(',
end: '\\)',
contains: BASIC_MODES
};
return {
name: 'Erlang',
aliases: ['erl'],
keywords: ERLANG_RESERVED,
illegal: '(</|\\*=|\\+=|-=|/\\*|\\*/|\\(\\*|\\*\\))',
contains: [
{
className: 'function',
begin: '^' + BASIC_ATOM_RE + '\\s*\\(',
end: '->',
returnBegin: true,
illegal: '\\(|#|//|/\\*|\\\\|:|;',
contains: [
PARAMS,
hljs.inherit(hljs.TITLE_MODE, {
begin: BASIC_ATOM_RE
})
],
starts: {
end: ';|\\.',
keywords: ERLANG_RESERVED,
contains: BASIC_MODES
}
},
COMMENT,
{
begin: '^-',
end: '\\.',
relevance: 0,
excludeEnd: true,
returnBegin: true,
keywords: {
$pattern: '-' + hljs.IDENT_RE,
keyword: '-module -record -undef -export -ifdef -ifndef -author -copyright -doc -vsn ' +
'-import -include -include_lib -compile -define -else -endif -file -behaviour ' +
'-behavior -spec'
},
contains: [PARAMS]
},
NUMBER,
hljs.QUOTE_STRING_MODE,
RECORD_ACCESS,
VAR1,
VAR2,
TUPLE,
{
begin: /\.$/
} // relevance booster
]
};
}
module.exports = erlang;