def define_racc_tasks
racc_files = self.spec.files.find_all { |f| f =~ /\.y$/ }
rex_files = self.spec.files.find_all { |f| f =~ /\.rex$/ }
parser_files = racc_files.map { |f| f.sub(/\.y$/, ".rb") }
lexer_files = rex_files.map { |f| f.sub(/\.rex$/, ".rb") }
self.clean_globs += parser_files
self.clean_globs += lexer_files
rule ".rb" => ".y" do |t|
begin
sh "racc #{racc_flags} -o #{t.name} #{t.source}"
rescue
abort "need racc, sudo gem install racc"
end
end
rule ".rb" => ".rex" do |t|
begin
sh "rex #{rex_flags} -o #{t.name} #{t.source}"
rescue
abort "need rexical, sudo gem install rexical"
end
end
desc "build the parser" unless parser_files.empty?
task :parser
desc "build the lexer" unless lexer_files.empty?
task :lexer
task :parser => parser_files
task :lexer => lexer_files
racc_tasks.each do |t|
task t => [:parser, :lexer]
end
end