1 files changed, 73 insertions, 0 deletions
diff --git a/tool/lrama/lib/lrama/command.rb b/tool/lrama/lib/lrama/command.rb
new file mode 100644
index 0000000000..12fc4fc7ec
--- /dev/null
+++ b/tool/lrama/lib/lrama/command.rb
@@ -0,0 +1,73 @@
+module Lrama
+  class Command
+    LRAMA_LIB = File.realpath(File.join(File.dirname(__FILE__)))
+    STDLIB_FILE_PATH = File.join(LRAMA_LIB, 'grammar', 'stdlib.y')
+
+    def run(argv)
+      begin
+        options = OptionParser.new.parse(argv)
+      rescue => e
+        message = e.message
+        message = message.gsub(/.+/, "\e[1m\\&\e[m") if Exception.to_tty?
+        abort message
+      end
+
+      Report::Duration.enable if options.trace_opts[:time]
+
+      warning = Lrama::Warning.new
+      text = options.y.read
+      options.y.close if options.y != STDIN
+      begin
+        grammar = Lrama::Parser.new(text, options.grammar_file, options.debug).parse
+        unless grammar.no_stdlib
+          stdlib_grammar = Lrama::Parser.new(File.read(STDLIB_FILE_PATH), STDLIB_FILE_PATH, options.debug).parse
+          grammar.insert_before_parameterizing_rules(stdlib_grammar.parameterizing_rules)
+        end
+        grammar.prepare
+        grammar.validate!
+      rescue => e
+        raise e if options.debug
+        message = e.message
+        message = message.gsub(/.+/, "\e[1m\\&\e[m") if Exception.to_tty?
+        abort message
+      end
+      states = Lrama::States.new(grammar, warning, trace_state: (options.trace_opts[:automaton] || options.trace_opts[:closure]))
+      states.compute
+      context = Lrama::Context.new(states)
+
+      if options.report_file
+        reporter = Lrama::StatesReporter.new(states)
+        File.open(options.report_file, "w+") do |f|
+          reporter.report(f, **options.report_opts)
+        end
+      end
+
+      if options.trace_opts && options.trace_opts[:rules]
+        puts "Grammar rules:"
+        puts grammar.rules
+      end
+
+      if options.trace_opts && options.trace_opts[:actions]
+        puts "Grammar rules with actions:"
+        grammar.rules.each { |rule| puts rule.with_actions }
+      end
+
+      File.open(options.outfile, "w+") do |f|
+        Lrama::Output.new(
+          out: f,
+          output_file_path: options.outfile,
+          template_name: options.skeleton,
+          grammar_file_path: options.grammar_file,
+          header_file_path: options.header_file,
+          context: context,
+          grammar: grammar,
+          error_recovery: options.error_recovery,
+        ).render
+      end
+
+      if warning.has_error?
+        exit false
+      end
+    end
+  end
+end