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/*
Language: Extended Backus-Naur Form
Author: Alex McKibben <alex@nullscope.net>
Website: https://en.wikipedia.org/wiki/Extended_Backus–
*/
/** @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 ;
