104 lines
1.9 KiB
JavaScript
104 lines
1.9 KiB
JavaScript
/**
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* @param {string} value
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* @returns {RegExp}
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* */
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/**
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* @param {RegExp | string } re
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* @returns {string}
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*/
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function source(re) {
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if (!re) return null;
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if (typeof re === "string") return re;
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return re.source;
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}
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/**
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* @param {...(RegExp | string) } args
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* @returns {string}
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*/
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function concat(...args) {
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const joined = args.map((x) => source(x)).join("");
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return joined;
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}
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/*
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Language: Augmented Backus-Naur Form
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Author: Alex McKibben <alex@nullscope.net>
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Website: https://tools.ietf.org/html/rfc5234
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Audit: 2020
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*/
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/** @type LanguageFn */
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function abnf(hljs) {
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const regexes = {
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ruleDeclaration: /^[a-zA-Z][a-zA-Z0-9-]*/,
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unexpectedChars: /[!@#$^&',?+~`|:]/
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};
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const keywords = [
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"ALPHA",
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"BIT",
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"CHAR",
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"CR",
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"CRLF",
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"CTL",
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"DIGIT",
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"DQUOTE",
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"HEXDIG",
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"HTAB",
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"LF",
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"LWSP",
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"OCTET",
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"SP",
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"VCHAR",
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"WSP"
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];
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const commentMode = hljs.COMMENT(/;/, /$/);
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const terminalBinaryMode = {
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className: "symbol",
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begin: /%b[0-1]+(-[0-1]+|(\.[0-1]+)+){0,1}/
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};
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const terminalDecimalMode = {
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className: "symbol",
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begin: /%d[0-9]+(-[0-9]+|(\.[0-9]+)+){0,1}/
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};
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const terminalHexadecimalMode = {
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className: "symbol",
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begin: /%x[0-9A-F]+(-[0-9A-F]+|(\.[0-9A-F]+)+){0,1}/
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};
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const caseSensitivityIndicatorMode = {
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className: "symbol",
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begin: /%[si]/
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};
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const ruleDeclarationMode = {
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className: "attribute",
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begin: concat(regexes.ruleDeclaration, /(?=\s*=)/)
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};
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return {
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name: 'Augmented Backus-Naur Form',
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illegal: regexes.unexpectedChars,
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keywords: keywords,
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contains: [
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ruleDeclarationMode,
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commentMode,
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terminalBinaryMode,
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terminalDecimalMode,
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terminalHexadecimalMode,
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caseSensitivityIndicatorMode,
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hljs.QUOTE_STRING_MODE,
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hljs.NUMBER_MODE
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]
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};
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}
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module.exports = abnf;
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