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def main
prelude
grammar
usercode
end
def prelude
while line = ARGF.gets
case line
when %r</\*%%%\*/>
puts '/*'
when %r</\*%>
puts '*/'
when %r<%\*/>
puts
when /\A%%/
puts '%%'
return
when /\A%token/
puts line.sub(/<\w+>/, '<val>')
when /\A%type/
puts line.sub(/<\w+>/, '<val>')
else
print line
end
end
end
def grammar
while line = ARGF.gets
case line
when %r</\*%%%\*/>
puts '#if 0'
when %r</\*%c%\*/>
puts '/*'
when %r</\*%c>
puts '*/'
when %r</\*%>
puts '#endif'
when %r<%\*/>
puts
when /\A%%/
puts '%%'
return
else
print line
end
end
end
def usercode
while line = ARGF.gets
print line
end
end
main
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