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abnf.js
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abnf.js
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/*
Language: Augmented Backus-Naur Form
Author: Alex McKibben <alex@nullscope.net>
Website: https://tools.ietf.org/html/rfc5234
*/
/** @type LanguageFn */
export default function(hljs) {
const regexes = {
ruleDeclaration: "^[a-zA-Z][a-zA-Z0-9-]*",
unexpectedChars: "[!@#$^&',?+~`|:]"
};
const keywords = [
"ALPHA",
"BIT",
"CHAR",
"CR",
"CRLF",
"CTL",
"DIGIT",
"DQUOTE",
"HEXDIG",
"HTAB",
"LF",
"LWSP",
"OCTET",
"SP",
"VCHAR",
"WSP"
];
const commentMode = hljs.COMMENT(";", "$");
const terminalBinaryMode = {
className: "symbol",
begin: /%b[0-1]+(-[0-1]+|(\.[0-1]+)+){0,1}/
};
const terminalDecimalMode = {
className: "symbol",
begin: /%d[0-9]+(-[0-9]+|(\.[0-9]+)+){0,1}/
};
const terminalHexadecimalMode = {
className: "symbol",
begin: /%x[0-9A-F]+(-[0-9A-F]+|(\.[0-9A-F]+)+){0,1}/
};
const caseSensitivityIndicatorMode = {
className: "symbol",
begin: /%[si]/
};
const ruleDeclarationMode = {
className: "attribute",
begin: regexes.ruleDeclaration + '(?=\\s*=)'
};
return {
name: 'Augmented Backus-Naur Form',
illegal: regexes.unexpectedChars,
keywords: keywords.join(" "),
contains: [
ruleDeclarationMode,
commentMode,
terminalBinaryMode,
terminalDecimalMode,
terminalHexadecimalMode,
caseSensitivityIndicatorMode,
hljs.QUOTE_STRING_MODE,
hljs.NUMBER_MODE
]
};
}