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/*
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Language: Extended Backus-Naur Form
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Author: Alex McKibben <alex@nullscope.net>
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Website: https://en.wikipedia.org/wiki/Extended_Backus–Naur_form
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*/
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/** @type LanguageFn */
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function ebnf(hljs) {
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const commentMode = hljs.COMMENT(/\(\*/, /\*\)/);
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const nonTerminalMode = {
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className: "attribute",
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begin: /^[ ]*[a-zA-Z]+([\s_-]+[a-zA-Z]+)*/
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};
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const specialSequenceMode = {
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className: "meta",
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begin: /\?.*\?/
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};
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const ruleBodyMode = {
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begin: /=/,
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end: /[.;]/,
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contains: [
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commentMode,
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specialSequenceMode,
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{
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// terminals
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className: 'string',
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variants: [
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hljs.APOS_STRING_MODE,
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hljs.QUOTE_STRING_MODE,
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{
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begin: '`',
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end: '`'
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}
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]
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}
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]
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};
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return {
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name: 'Extended Backus-Naur Form',
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illegal: /\S/,
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contains: [
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commentMode,
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nonTerminalMode,
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ruleBodyMode
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]
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};
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}
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module.exports = ebnf;
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