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csharp.js
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/*
Language: C#
Author: Jason Diamond <jason@diamond.name>
Contributor: Nicolas LLOBERA <nllobera@gmail.com>, Pieter Vantorre <pietervantorre@gmail.com>, David Pine <david.pine@microsoft.com>
Website: https://docs.microsoft.com/en-us/dotnet/csharp/
Category: common
*/
/** @type LanguageFn */
function csharp(hljs) {
const BUILT_IN_KEYWORDS = [
'bool',
'byte',
'char',
'decimal',
'delegate',
'double',
'dynamic',
'enum',
'float',
'int',
'long',
'nint',
'nuint',
'object',
'sbyte',
'short',
'string',
'ulong',
'uint',
'ushort'
];
const FUNCTION_MODIFIERS = [
'public',
'private',
'protected',
'static',
'internal',
'protected',
'abstract',
'async',
'extern',
'override',
'unsafe',
'virtual',
'new',
'sealed',
'partial'
];
const LITERAL_KEYWORDS = [
'default',
'false',
'null',
'true'
];
const NORMAL_KEYWORDS = [
'abstract',
'as',
'base',
'break',
'case',
'catch',
'class',
'const',
'continue',
'do',
'else',
'event',
'explicit',
'extern',
'finally',
'fixed',
'for',
'foreach',
'goto',
'if',
'implicit',
'in',
'interface',
'internal',
'is',
'lock',
'namespace',
'new',
'operator',
'out',
'override',
'params',
'private',
'protected',
'public',
'readonly',
'record',
'ref',
'return',
'sealed',
'sizeof',
'stackalloc',
'static',
'struct',
'switch',
'this',
'throw',
'try',
'typeof',
'unchecked',
'unsafe',
'using',
'virtual',
'void',
'volatile',
'while'
];
const CONTEXTUAL_KEYWORDS = [
'add',
'alias',
'and',
'ascending',
'async',
'await',
'by',
'descending',
'equals',
'from',
'get',
'global',
'group',
'init',
'into',
'join',
'let',
'nameof',
'not',
'notnull',
'on',
'or',
'orderby',
'partial',
'remove',
'select',
'set',
'unmanaged',
'value|0',
'var',
'when',
'where',
'with',
'yield'
];
const KEYWORDS = {
keyword: NORMAL_KEYWORDS.concat(CONTEXTUAL_KEYWORDS),
built_in: BUILT_IN_KEYWORDS,
literal: LITERAL_KEYWORDS
};
const TITLE_MODE = hljs.inherit(hljs.TITLE_MODE, { begin: '[a-zA-Z](\\.?\\w)*' });
const NUMBERS = {
className: 'number',
variants: [
{ begin: '\\b(0b[01\']+)' },
{ begin: '(-?)\\b([\\d\']+(\\.[\\d\']*)?|\\.[\\d\']+)(u|U|l|L|ul|UL|f|F|b|B)' },
{ begin: '(-?)(\\b0[xX][a-fA-F0-9\']+|(\\b[\\d\']+(\\.[\\d\']*)?|\\.[\\d\']+)([eE][-+]?[\\d\']+)?)' }
],
relevance: 0
};
const VERBATIM_STRING = {
className: 'string',
begin: '@"',
end: '"',
contains: [ { begin: '""' } ]
};
const VERBATIM_STRING_NO_LF = hljs.inherit(VERBATIM_STRING, { illegal: /\n/ });
const SUBST = {
className: 'subst',
begin: /\{/,
end: /\}/,
keywords: KEYWORDS
};
const SUBST_NO_LF = hljs.inherit(SUBST, { illegal: /\n/ });
const INTERPOLATED_STRING = {
className: 'string',
begin: /\$"/,
end: '"',
illegal: /\n/,
contains: [
{ begin: /\{\{/ },
{ begin: /\}\}/ },
hljs.BACKSLASH_ESCAPE,
SUBST_NO_LF
]
};
const INTERPOLATED_VERBATIM_STRING = {
className: 'string',
begin: /\$@"/,
end: '"',
contains: [
{ begin: /\{\{/ },
{ begin: /\}\}/ },
{ begin: '""' },
SUBST
]
};
const INTERPOLATED_VERBATIM_STRING_NO_LF = hljs.inherit(INTERPOLATED_VERBATIM_STRING, {
illegal: /\n/,
contains: [
{ begin: /\{\{/ },
{ begin: /\}\}/ },
{ begin: '""' },
SUBST_NO_LF
]
});
SUBST.contains = [
INTERPOLATED_VERBATIM_STRING,
INTERPOLATED_STRING,
VERBATIM_STRING,
hljs.APOS_STRING_MODE,
hljs.QUOTE_STRING_MODE,
NUMBERS,
hljs.C_BLOCK_COMMENT_MODE
];
SUBST_NO_LF.contains = [
INTERPOLATED_VERBATIM_STRING_NO_LF,
INTERPOLATED_STRING,
VERBATIM_STRING_NO_LF,
hljs.APOS_STRING_MODE,
hljs.QUOTE_STRING_MODE,
NUMBERS,
hljs.inherit(hljs.C_BLOCK_COMMENT_MODE, { illegal: /\n/ })
];
const STRING = { variants: [
INTERPOLATED_VERBATIM_STRING,
INTERPOLATED_STRING,
VERBATIM_STRING,
hljs.APOS_STRING_MODE,
hljs.QUOTE_STRING_MODE
] };
const GENERIC_MODIFIER = {
begin: "<",
end: ">",
contains: [
{ beginKeywords: "in out" },
TITLE_MODE
]
};
const TYPE_IDENT_RE = hljs.IDENT_RE + '(<' + hljs.IDENT_RE + '(\\s*,\\s*' + hljs.IDENT_RE + ')*>)?(\\[\\])?';
const AT_IDENTIFIER = {
// prevents expressions like `@class` from incorrect flagging
// `class` as a keyword
begin: "@" + hljs.IDENT_RE,
relevance: 0
};
return {
name: 'C#',
aliases: [
'cs',
'c#'
],
keywords: KEYWORDS,
illegal: /::/,
contains: [
hljs.COMMENT(
'///',
'$',
{
returnBegin: true,
contains: [
{
className: 'doctag',
variants: [
{
begin: '///',
relevance: 0
},
{ begin: '<!--|-->' },
{
begin: '</?',
end: '>'
}
]
}
]
}
),
hljs.C_LINE_COMMENT_MODE,
hljs.C_BLOCK_COMMENT_MODE,
{
className: 'meta',
begin: '#',
end: '$',
keywords: { keyword: 'if else elif endif define undef warning error line region endregion pragma checksum' }
},
STRING,
NUMBERS,
{
beginKeywords: 'class interface',
relevance: 0,
end: /[{;=]/,
illegal: /[^\s:,]/,
contains: [
{ beginKeywords: "where class" },
TITLE_MODE,
GENERIC_MODIFIER,
hljs.C_LINE_COMMENT_MODE,
hljs.C_BLOCK_COMMENT_MODE
]
},
{
beginKeywords: 'namespace',
relevance: 0,
end: /[{;=]/,
illegal: /[^\s:]/,
contains: [
TITLE_MODE,
hljs.C_LINE_COMMENT_MODE,
hljs.C_BLOCK_COMMENT_MODE
]
},
{
beginKeywords: 'record',
relevance: 0,
end: /[{;=]/,
illegal: /[^\s:]/,
contains: [
TITLE_MODE,
GENERIC_MODIFIER,
hljs.C_LINE_COMMENT_MODE,
hljs.C_BLOCK_COMMENT_MODE
]
},
{
// [Attributes("")]
className: 'meta',
begin: '^\\s*\\[(?=[\\w])',
excludeBegin: true,
end: '\\]',
excludeEnd: true,
contains: [
{
className: 'string',
begin: /"/,
end: /"/
}
]
},
{
// Expression keywords prevent 'keyword Name(...)' from being
// recognized as a function definition
beginKeywords: 'new return throw await else',
relevance: 0
},
{
className: 'function',
begin: '(' + TYPE_IDENT_RE + '\\s+)+' + hljs.IDENT_RE + '\\s*(<[^=]+>\\s*)?\\(',
returnBegin: true,
end: /\s*[{;=]/,
excludeEnd: true,
keywords: KEYWORDS,
contains: [
// prevents these from being highlighted `title`
{
beginKeywords: FUNCTION_MODIFIERS.join(" "),
relevance: 0
},
{
begin: hljs.IDENT_RE + '\\s*(<[^=]+>\\s*)?\\(',
returnBegin: true,
contains: [
hljs.TITLE_MODE,
GENERIC_MODIFIER
],
relevance: 0
},
{ match: /\(\)/ },
{
className: 'params',
begin: /\(/,
end: /\)/,
excludeBegin: true,
excludeEnd: true,
keywords: KEYWORDS,
relevance: 0,
contains: [
STRING,
NUMBERS,
hljs.C_BLOCK_COMMENT_MODE
]
},
hljs.C_LINE_COMMENT_MODE,
hljs.C_BLOCK_COMMENT_MODE
]
},
AT_IDENTIFIER
]
};
}
module.exports = csharp;

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