#line 2 "grammar.rules"

/*************************************************************************
 * Copyright (C) 2010 Tavian Barnes <tavianator@tavianator.com>          *
 *                                                                       *
 * This file is part of Dimension.                                       *
 *                                                                       *
 * Dimension 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.                                       *
 *                                                                       *
 * Dimension 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/>. *
 *************************************************************************/

/*
 * Start symbol
 */

SCENE: /* empty */
     | SCENE SCENE_ITEM {
       dmnsn_array_push(astree, &$2);
     }
;

/* Top-level scene item */
SCENE_ITEM: GLOBAL_SETTINGS
          | ATMOSPHERIC_EFFECT
          | CAMERA
          | OBJECT
;

/* Global settings */

GLOBAL_SETTINGS: "global_settings" "{"
                   GLOBAL_SETTINGS_ITEMS
                 "}"
               {
                 $$ = $3;
               }
;

GLOBAL_SETTINGS_ITEMS: /* empty */ {
                       $$ = dmnsn_new_astnode(DMNSN_AST_GLOBAL_SETTINGS, @$);
                     }
                     | GLOBAL_SETTINGS_ITEMS GLOBAL_SETTINGS_ITEM {
                       $$ = $1;
                       dmnsn_array_push($$.children, &$2);
                     }
;

GLOBAL_SETTINGS_ITEM: "adc_bailout" FLOAT {
                      $$ = dmnsn_new_astnode1(DMNSN_AST_ADC_BAILOUT, @$, $2);
                    }
                    | "ambient_light" COLOR {
                      $$ = dmnsn_new_astnode1(DMNSN_AST_AMBIENT, @$, $2);
                    }
                    | "assumed_gamma" FLOAT {
                      dmnsn_diagnostic(@1,
                                       "WARNING: assumed_gamma not supported");
                      $$ = dmnsn_new_astnode1(DMNSN_AST_ASSUMED_GAMMA, @$, $2);
                    }
                    | "charset" GLOBAL_CHARSET {
                      dmnsn_diagnostic(@1,
                                       "WARNING: charset not supported");
                      $$ = dmnsn_new_astnode1(DMNSN_AST_CHARSET, @$, $2);
                    }
                    | "max_intersections" INT {
                      dmnsn_diagnostic(@1,
                                       "WARNING: max_intersections is"
                                       " unnecessary for Dimension");
                      $$ = dmnsn_new_astnode1(DMNSN_AST_MAX_INTERSECTIONS, @$,
                                              $2);
                    }
                    | "max_trace_level" INT {
                      $$ = dmnsn_new_astnode1(DMNSN_AST_MAX_TRACE_LEVEL, @$,
                                              $2);
                    }
;

GLOBAL_CHARSET: "ascii" {
                $$ = dmnsn_new_astleaf(DMNSN_AST_ASCII, @$);
              }
              | "utf8" {
                $$ = dmnsn_new_astleaf(DMNSN_AST_UTF8, @$);
              }
              | "sys" {
                $$ = dmnsn_new_astleaf(DMNSN_AST_SYS, @$);
              }

/* Atmospheric effects */

ATMOSPHERIC_EFFECT: BACKGROUND
                  | SKY_SPHERE
;

BACKGROUND: "background" "{" COLOR "}" {
            $$ = dmnsn_new_astnode1(DMNSN_AST_BACKGROUND, @$, $3);
          }
;

SKY_SPHERE: "sky_sphere" "{"
              SKY_SPHERE_ITEMS
            "}"
          {
            $$ = $3;
          }
;

SKY_SPHERE_ITEMS: /* empty */ {
                  $$ = dmnsn_new_astnode(DMNSN_AST_SKY_SPHERE, @$);
                }
                | SKY_SPHERE_ITEMS PIGMENT {
                  $$ = $1;
                  dmnsn_array_push($$.children, &$2);
                }
                | SKY_SPHERE_ITEMS TRANSFORMATION {
                  $$ = $1;
                  dmnsn_array_push($$.children, &$2);
                }
;