/*
 *  matiec - a compiler for the programming languages defined in IEC 61131-3
 *  Copyright (C) 2003-2011  Mario de Sousa (msousa@fe.up.pt)
 *  Copyright (C) 2007-2011  Laurent Bessard and Edouard Tisserant
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 *
 * This code is made available on the understanding that it will not be
 * used in safety-critical situations without a full and competent review.
 */

/*
 * An IEC 61131-3 compiler.
 *
 * Based on the
 * FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)
 *
 */

/*
 ****************************************************************
 ****************************************************************
 ****************************************************************
 *********                                              *********
 *********                                              *********
 *********   O V E R A L L    A R C H I T E C T U R E   *********
 *********                                              *********
 *********                                              *********
 ****************************************************************
 ****************************************************************
 ****************************************************************

 The compiler works in 4(+1) stages:
 Stage 1   - Lexical analyser      - implemented with flex (iec.flex)
 Stage 2   - Syntax parser         - implemented with bison (iec.y)
 Stage 3   - Semantics analyser    - not yet implemented
 Stage 4   - Code generator        - implemented in C++
 Stage 4+1 - Binary code generator - gcc, javac, etc...


 Data structures passed between stages, in global variables:
 1->2   : tokens (int), and token values (char *)
 2->1   : symbol tables (defined in symtable.hh)
 2->3   : abstract syntax tree (tree of C++ classes, in absyntax.hh file)
 3->4   : Same as 2->3
 4->4+1 : file with program in c, java, etc...


 The compiler works in several passes:
 Pass 1: executes stages 1 and 2 simultaneously
 Pass 2: executes stage 3
 Pass 3: executes stage 4
 Pass 4: executes stage 4+1
*/



//#include <stdio.h>   // printf()
#include <getopt.h>
#include <string.h>
#include <stdlib.h>  // EXIT_FAILURE
#include "absyntax/absyntax.hh"  // symbol_c type

/* A macro for printing out internal parser errors... */
#include <iostream> // required for std::cerr

#ifndef HGVERSION
#define HGVERSION ""
#endif

#include "main.hh"  // symbol_c type
#include <stdarg.h> // required for va_start(), va_list

void error_exit(const char *file_name, int line_no, const char *errmsg, ...) {
  va_list argptr;
  va_start(argptr, errmsg); /* second argument is last fixed pamater of error_exit() */

  fprintf(stderr, "\nInternal compiler error in file %s at line %d", file_name, line_no);
  if (errmsg != NULL) {
    fprintf(stderr, ": ");
    vfprintf(stderr, errmsg, argptr);
  } else {
    fprintf(stderr, ".");
  }
  fprintf(stderr, "\n");
  va_end(argptr);
    
  exit(EXIT_FAILURE);
}



#include "config/config.h"
#include "stage1_2/stage1_2.hh"
#include "absyntax_utils/absyntax_utils.hh"

int stage3(symbol_c *tree_root);
int stage4(symbol_c *tree_root, const char *builddir);


static void printusage(const char *cmd) {
  printf("syntax: %s [-h] [-v] [-f] [-s] [-I <include_directory>] [-T <target_directory>] <input_file>\n", cmd);
  printf("  h : show this help message\n");
  printf("  v : print version number\n");  
  printf("  f : display full token location on error messages\n");
      /******************************************************/
      /* whether we are suporting safe extensions           */
      /* as defined in PLCopen - Technical Committee 5      */
      /* Safety Software Technical Specification,           */
      /* Part 1: Concepts and Function Blocks,              */
      /* Version 1.0 – Official Release                     */
      /******************************************************/
  printf("  s : allow use of safe extensions\n");
  printf("\n");
  printf("%s - Copyright (C) 2003-2011 \n"
         "This program comes with ABSOLUTELY NO WARRANTY!\n"
         "This is free software licensed under GPL v3, and you are welcome to redistribute it under the conditions specified by this license.\n", PACKAGE_NAME);
}



int main(int argc, char **argv) {
  symbol_c *tree_root;
  char * builddir = NULL;
  stage1_2_options_t stage1_2_options = {false, false, NULL};
  int optres, errflg = 0;
  int path_len;
/*
  extern char *optarg;
  extern int optind, optopt;
*/

  /******************************************/
  /*   Parse command line options...        */
  /******************************************/
  while ((optres = getopt(argc, argv, ":hvfsI:T:")) != -1) {
    switch(optres) {
    case 'h':
      printusage(argv[0]);
      return 0;
    case 'v':
      fprintf(stdout, "%s version %s\n"
		      "changeset id: %s\n", PACKAGE_NAME, PACKAGE_VERSION, HGVERSION);      
      return 0;        
    case 'f':
      stage1_2_options.full_token_loc = true;
      break;
    case 's':
      stage1_2_options.safe_extensions = true;
      break;
    case 'I':
      /* NOTE: To improve the usability under windows:
       *       We delete last char's path if it ends with "\".
       *       In this way compiler front-end accepts paths with or without
       *       slash terminator.
       */
      path_len = strlen(optarg) - 1;
      if (optarg[path_len] == '\\') optarg[path_len]= '\0';
      stage1_2_options.includedir = optarg;
      break;
    case 'T':
      /* NOTE: see note above */
      path_len = strlen(optarg) - 1;
      if (optarg[path_len] == '\\') optarg[path_len]= '\0';
      builddir = optarg;
      break;
    case ':':       /* -I or -T without operand */
      fprintf(stderr, "Option -%c requires an operand\n", optopt);
      errflg++;
      break;
    case '?':
      fprintf(stderr, "Unrecognized option: -%c\n", optopt);
      errflg++;
      break;
    default:
      fprintf(stderr, "Unknown error while parsing command line options.");
      errflg++;
      break;
    }
  }

  if (optind == argc) {
    fprintf(stderr, "Missing input file\n");
    errflg++;
  }

  if (optind > argc) {
    fprintf(stderr, "Too many input files\n");
    errflg++;
  }

  if (errflg) {
      printf("\n");
      printusage(argv[0]);
      return EXIT_FAILURE;
  }


  /***************************/
  /*   Run the compiler...   */
  /***************************/
  /* 1st Pass */
  if (stage1_2(argv[optind], &tree_root, stage1_2_options) < 0)
    return EXIT_FAILURE;

  /* 2nd Pass */
    /* basically loads some symbol tables to speed up look ups later on */
  absyntax_utils_init(tree_root);  
    /* moved to bison, although it could perfectly well still be here instead of in bison code. */
  //add_en_eno_param_decl_c::add_to(tree_root);

  /* Do semantic verification of code (data type and lvalue checking currently implemented) */
  if (stage3(tree_root) < 0)
    return EXIT_FAILURE;
  

  /* 3rd Pass */
  if (stage4(tree_root, builddir) < 0)
    return EXIT_FAILURE;

  /* 4th Pass */
  /* Call gcc, g++, or whatever... */
  /* Currently implemented in the Makefile! */

  return 0;
}