generator.cpp

用于词法分析的词法分析器

/*
  $Id: generator.cpp,v 1.8 1997/02/22 08:59:46 matt Exp $

  Elex C++ code generator module.

  (c) Matt Phillips 1996.
  */

#include <iostream.h>
#include <fstream.h>
#include <string.h>
#include <errno.h>

#include <foo/FooParser.h>

#include "CppCodeGenerator.h"

void error (const string message, int abortcode = 0)
{
  cerr << "generator: " << message << endl;
  if (abortcode > 0) exit (abortcode);
}

// check stream <str> which should be a stream opened for file with
// <name> is open.
int checkStream (ios &str, const string &name)
{
  if (!str)
  {
    error ("could not open '" + name + "': " + strerror (errno), 1);
  }
}

int main (int argc, char **argv)
{
  if (argc != 5)
  {
    cerr << "\nusage: generator <code_frags> <header_file> <code_file> <actual_header_file>\n\n";
    return 1;
  }

  ifstream codefrags (argv [1]); checkStream (codefrags, argv [1]);
  ofstream header (argv [2]); checkStream (header, argv [2]);
  ofstream body (argv [3]); checkStream (body, argv [3]);

  BufferedInputStream input (cin);
  FooParser parser (input);

  if (parser.nErrors () > 0)
  {
    error ("code generator: errors found in foo:");
    cerr << parser.getErrors () << endl;
    return 1;
  } else
  {
    if (!parser.getObject ().isAtomic ())
    {
      // include header into body
      body << "#include \"" << argv [4] << "\"\n\n";

      CppCodeGenerator codegen (parser.getObject (),
				codefrags, header, body);
      return codegen.nErrors () != 0;
    } else
    {
      error ("illegal scanner definition", 1);
    }
  }
  return 0;
}