Main.cs :  » Script » IronRuby » gpcc » C# / CSharp Open Source

// Copyright (c) Microsoft Corporation. All rights reserved.

using System;
using System.Collections.Generic;


namespace gpcc{
  class GPCG
  {
    public static bool LINES = true;
    public static bool REPORT = false;
        public static bool DEFINES = false;
        public static bool FORGPLEX = false;

    private static void Main(string[] args)
    {
      try
      {
        string filename = ProcessOptions(args);

        if (filename == null)
          return;

        Parser parser = new Parser();
        Grammar grammar = parser.Parse(filename);

        LALRGenerator generator = new LALRGenerator(grammar);
        List<State> states = generator.BuildStates();
        generator.ComputeLookAhead();
        generator.BuildParseTable();
                if (!grammar.CheckGrammar())
                    throw new Exception("Non-terminating grammar");

        if (REPORT)
          generator.Report();
        else
        {
          CodeGenerator code = new CodeGenerator();
          code.Generate(states, grammar);
        }
      }
      catch (Scanner.ParseException e)
      {
        Console.Error.WriteLine("Parse error (line {0}, column {1}): {2}", e.line, e.column, e.Message);
      }
      catch (System.Exception e)
      {
        Console.Error.WriteLine("Unexpected Error {0}", e.Message);
      }
    }


    private static string ProcessOptions(string[] args)
    {
      string filename = null;

      foreach (string arg in args)
      {
        if (arg[0] == '-' || arg[0] == '/')
          switch (arg.Substring(1))
          {
            case "?":
            case "h":
            case "help":
              DisplayHelp();
              return null;
            case "v":
            case "version":
              DisplayVersion();
              return null;
            case "l":
            case "no-lines":
              LINES = false;
              break;
            case "r":
            case "report":
              REPORT = true;
              break;
                        case "d":
                        case "defines":
                            DEFINES = true;
                            break;
                        case "gplex":
                            FORGPLEX = true;
                            break;
          }
        else
          filename = arg;
      }

      if (filename == null)
        DisplayHelp();

      return filename;
    }


    private static void DisplayHelp()
    {
      Console.WriteLine("Usage gppg [options] filename");
      Console.WriteLine();
      Console.WriteLine("/help:       Display this help message");
      Console.WriteLine("/version:    Display version information");
      Console.WriteLine("/report:     Display LALR(1) parsing states");
      Console.WriteLine("/no-lines:   Suppress the generation of #line directives");
            Console.WriteLine("/defines:    Emit \"tokens\" file with token name list");
            Console.WriteLine("/gplex:      Generate scanner base class for GPLEX");
      Console.WriteLine();
    }


    private static void DisplayVersion()
    {
            Console.WriteLine("Gardens Point Parser Generator (gppg) 1.0.1.69 23/January/2007");
            Console.WriteLine("Written by Wayne Kelly");
            Console.WriteLine("w.kelly@qut.ed.au");
            Console.WriteLine("Queensland University of Technology");
            Console.WriteLine();
    }
  }
}