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/* PEG grammar for a subset of wikitext, useful in the MediaWiki frontend */
start
= e:expression* { return e.length > 1 ? [ "CONCAT" ].concat(e) : e[0]; }
expression
= template
/ link
/ extlink
/ replacement
/ literal
paramExpression
= template
/ link
/ extlink
/ replacement
/ literalWithoutBar
template
= "{{" t:templateContents "}}" { return t; }
templateContents
= twr:templateWithReplacement p:templateParam* { return twr.concat(p) }
/ twr:templateWithOutReplacement p:templateParam* { return twr.concat(p) }
/ t:templateName p:templateParam* { return p.length ? [ t, p ] : [ t ] }
templateWithReplacement
= t:templateName ":" r:replacement { return [ t, r ] }
templateWithOutReplacement
= t:templateName ":" p:paramExpression { return [ t, p ] }
templateParam
= "|" e:paramExpression* { return e.length > 1 ? [ "CONCAT" ].concat(e) : e[0]; }
templateName
= tn:[A-Za-z_]+ { return tn.join('').toUpperCase() }
link
= "[[" w:expression "]]" { return [ 'WLINK', w ]; }
extlink
= "[" url:url whitespace text:expression "]" { return [ 'LINK', url, text ] }
url
= url:[^ ]+ { return url.join(''); }
whitespace
= [ ]+
replacement
= '$' digits:digits { return [ 'REPLACE', parseInt( digits, 10 ) - 1 ] }
digits
= [0-9]+
literal
= lit:escapedOrRegularLiteral+ { return lit.join(''); }
literalWithoutBar
= lit:escapedOrLiteralWithoutBar+ { return lit.join(''); }
escapedOrRegularLiteral
= escapedLiteral
/ regularLiteral
escapedOrLiteralWithoutBar
= escapedLiteral
/ regularLiteralWithoutBar
escapedLiteral
= "\\" escaped:. { return escaped; }
regularLiteral
= [^{}\[\]$\\]
regularLiteralWithoutBar
= [^{}\[\]$\\|]
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