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107 lines
2.2 KiB
Ruby
107 lines
2.2 KiB
Ruby
# frozen_string_literal: true
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# $Id$
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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 = "".dup
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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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@exprs = {}
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lex_state_def = false
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while line = f.gets
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case line
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when /\A%%/
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out << "%%\n"
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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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when /^enum lex_state_(?:bits|e) \{/
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lex_state_def = true
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out << line
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when /^\}/
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lex_state_def = false
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out << line
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else
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out << line
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end
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if lex_state_def
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case line
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when /^\s*(EXPR_\w+),\s+\/\*(.+)\*\//
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@exprs[$1.chomp("_bit")] = $2.strip
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when /^\s*(EXPR_\w+)\s+=\s+(.+)$/
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name = $1
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val = $2.chomp(",")
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@exprs[name] = "equals to " + (val.start_with?("(") ? "<tt>#{val}</tt>" : "+#{val}+")
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end
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end
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end
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end
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require_relative "dsl"
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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</\*% *ripper(?:\[(.*?)\])?: *(.*?) *%\*/>
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out << DSL.new($2, ($1 || "").split(",")).generate << "\n"
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when %r</\*%%%\*/>
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out << "#if 0\n"
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when %r</\*%>
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out << "#endif\n"
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when %r<%\*/>
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out << "\n"
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when /\A%%/
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out << "%%\n"
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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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require 'erb'
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compiler = ERB::Compiler.new('%-')
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compiler.put_cmd = compiler.insert_cmd = "out.<<"
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lineno = f.lineno
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src, = compiler.compile(f.read)
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eval(src, binding, f.path, lineno)
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end
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main
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