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