92 lines
1.6 KiB
Ruby
Executable File
92 lines
1.6 KiB
Ruby
Executable File
# $Id$
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require 'optparse'
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def main
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output = nil
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parser = OptionParser.new
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parser.banner = "Usage: #{File.basename($0)} [--output=PATH] <parse.y>"
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parser.on('--output=PATH', 'An output file.') {|path|
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output = path
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}
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parser.on('--help', 'Prints this message and quit.') {
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puts parser.help
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exit true
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}
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begin
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parser.parse!
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rescue OptionParser::ParseError => err
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$stderr.puts err.message
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$stderr.puts parser.help
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exit false
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end
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unless ARGV.size == 1
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abort "wrong number of arguments (#{ARGV.size} for 1)"
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end
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out = ""
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File.open(ARGV[0]) {|f|
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prelude f, out
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grammar f, out
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usercode f, out
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}
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if output
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File.open(output, 'w') {|f|
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f.write out
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}
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else
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print out
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end
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end
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def prelude(f, out)
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while line = f.gets
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case line
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when %r</\*%%%\*/>
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out << '/*' << $/
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when %r</\*%>
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out << '*/' << $/
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when %r<%\*/>
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out << $/
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when /\A%%/
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out << '%%' << $/
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return
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when /\A%token/
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out << line.sub(/<\w+>/, '<val>')
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when /\A%type/
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out << line.sub(/<\w+>/, '<val>')
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else
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out << line
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end
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end
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end
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def grammar(f, out)
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while line = f.gets
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case line
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when %r</\*%%%\*/>
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out << '#if 0' << $/
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when %r</\*%c%\*/>
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out << '/*' << $/
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when %r</\*%c>
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out << '*/' << $/
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when %r</\*%>
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out << '#endif' << $/
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when %r<%\*/>
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out << $/
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when /\A%%/
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out << '%%' << $/
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return
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else
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out << line
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end
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end
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end
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def usercode(f, out)
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while line = f.gets
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out << line
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end
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end
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main
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