/*
* Descent 3 
* Copyright (C) 2024 Parallax Software
*
* 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/>.
*/

// InfFile.h: interface for the InfFile class.
//
//////////////////////////////////////////////////////////////////////

#ifndef INFFILE_H
#define INFFILE_H

#if _MSC_VER >= 1000
#pragma once
#endif // _MSC_VER >= 1000

#include "pstypes.h"
#include "psclass.h"

struct CFILE;

enum InfFileError {
  INFFILE_LINELEN = 256,
  INFFILE_CUSTOM = -128,
  INFFILE_ERROR = -1,
  INFFILE_COMMENT = -2,
  INFFILE_EOL = -3,
  INFFILE_SYMBOL = 1024,
};

class InfFile {
public:
  InfFile();
  virtual ~InfFile();

  //	opens an inf file, pass in a lexical analyzer that will return a command index.
  //	tag_check is a string that must appear at the very beginning of the file.
  //	lexfn is a function to match a command to a number.   num <= 0 and num >=1024 are taken.
  bool Open(const char *filename, const char *tag_check, int (*lexfn)(const char *command));

  //	closes the file
  void Close();

  //	read a command line. returns false on eof.
  bool ReadLine();

  //	parses a line of 'code'.  return value from the lexfn
  //	check INFFILE constants above. (any value less than 0, you should read in a new line.)
  int ParseLine(char *operand, int oprlen);

private:
  CFILE *m_fp;                  //	file object.
  int (*m_lexfn)(const char *); // lexical analyzer.
  char m_linetext[INFFILE_LINELEN];
  char *m_lineptr; // pointer to current text line.
  char *m_endptr;  // pointer to last character in text line
  int m_line;      // line #

  struct sym_info // full runtime symbol
  {
    char name[PSPATHNAME_LEN];
    char *text;
  };

  // inf file symbol list
  tList<sym_info> m_sym_list; // symbol list.

private:
  void AddSymbol(const char *name, const char *text);
  const char *GetSymbolText(const char *name);
  void FreeSymbols();

public:
  // line number
  int line() const { return m_line; };
};

#endif