/* main.c
   Copyright (C) 2005,2006,2007 Eugene K. Ressler, Jr.

This file is part of Sketch, a small, simple system for making 
3d drawings with LaTeX and the PSTricks or TikZ package.

Sketch 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, or (at your option)
any later version.

Sketch 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 Sketch; see the file COPYING.txt.  If not, see
http://www.gnu.org/copyleft */

#include <stdio.h>
#include "main.h"
#include "cmdline.h"
#include "parse.h"
#include "emit.h"

static CMD_LINE_OPT_ENV wrap_env[1];

int
main (int argc, char *argv[])
{
  OBJECT *scene, *hsr_scene;
  int ret;
  FILE *out_file;
  SYMBOL_TABLE *sym_tab;

  // create the outer symbol table
  sym_tab = new_scope (NULL);

  // make first pass through options to process those that are position-independent
  // save the rest in the wrap environment for later processing
  process_global_options (wrap_env, argc, argv, sym_tab);

  // die if there were errors parsing options
  if (trouble_p ())
    report_errors ();

  // if options show no interest in input
  if (wrap_env->skip_input_p) {
    if (wrap_env->n_files > 0)
      warn (no_line, "input ignored");
    return 0;
  }

  if (wrap_env->out_file_name)
    {
      out_file = fopen (wrap_env->out_file_name, "w");
      if (!out_file)
	err (no_line, "can't open '%s' for output", wrap_env->out_file_name);
    }
  else
    {
      out_file = stdout;
    }

  // die if there were errors preparing output stream
  if (trouble_p ())
    report_errors ();

  // set up the global environment for the parser
  init_global_env (global_env, wrap_env->pst_version);

  // process first set of tag defs and set up first input file
  ret = yywrap ();

  // quits if there were file opening errors in wrap
  if (ret == 0)
    {
      if (trouble_p ())
	report_errors ();
    }
  else
    {
      set_lexer_file ("<stdin>", stdin);
    }

  if (parse (sym_tab) != 0 && !trouble_p ())
    // emit an error to ensure report_errors halts 
    err (line, "parse error");

  // quits if there is trouble
  report_errors ();

  // flatten the object hierarchy into a scene
  scene = flat_scene (parsed_objects (), global_env);

  // painter's algorithm for HSR / HLR
  if (wrap_env->bsp_only_p)
    {
      hsr_scene = hsr_scene_with_bsp (scene);
    }
  else
    {
      hsr_scene = hsr_scene_with_depth_sort (scene);
    }

  // emit PStricks or TikZ
  emit (out_file, hsr_scene, global_env, wrap_env->doc_template_file_name);

  return 0;
}

int
yywrap (void)
{
  char *file_name = advance_to_next_file_name (wrap_env);
  if (file_name)
    {
      FILE *f = fopen (file_name, "r");
      if (f)
	{
	  set_lexer_file (file_name, f);
	  return 0;
	}
      else
	{
	  err (no_line, "can't open file '%s' for input", file_name);
	}
    }
  return 1;
}