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/*************************************************************************
* Copyright (C) 2009 Tavian Barnes <tavianator@gmail.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/>. *
*************************************************************************/
#ifndef PARSE_H
#define PARSE_H
#include "../libdimension/dimension.h"
/*
* Abstract syntax tree
*/
/* Abstract syntax tree node types */
typedef enum {
DMNSN_AST_NONE,
DMNSN_AST_ROTATION,
DMNSN_AST_SCALE,
DMNSN_AST_TRANSLATION,
DMNSN_AST_CAMERA,
DMNSN_AST_PERSPECTIVE,
DMNSN_AST_LOCATION,
DMNSN_AST_RIGHT,
DMNSN_AST_UP,
DMNSN_AST_SKY,
DMNSN_AST_ANGLE,
DMNSN_AST_LOOK_AT,
DMNSN_AST_DIRECTION,
DMNSN_AST_BACKGROUND,
DMNSN_AST_BOX,
DMNSN_AST_LIGHT_SOURCE,
DMNSN_AST_SPHERE,
DMNSN_AST_OBJECT_MODIFIERS,
DMNSN_AST_TEXTURE,
DMNSN_AST_PIGMENT,
DMNSN_AST_FLOAT,
DMNSN_AST_INTEGER,
DMNSN_AST_VECTOR,
DMNSN_AST_ADD,
DMNSN_AST_SUB,
DMNSN_AST_MUL,
DMNSN_AST_DIV,
DMNSN_AST_NEGATE,
DMNSN_AST_DOT_X,
DMNSN_AST_DOT_Y,
DMNSN_AST_DOT_Z,
DMNSN_AST_DOT_T,
DMNSN_AST_DOT_TRANSMIT,
DMNSN_AST_COLOR,
DMNSN_AST_IDENTIFIER,
DMNSN_AST_STRING,
} dmnsn_astnode_type;
/* Abstract syntax tree node (a dmnsn_array* of these is an AST) */
typedef struct dmnsn_astnode {
dmnsn_astnode_type type;
/* Child nodes */
dmnsn_array *children;
/* Generic data pointer */
void *ptr;
/* Reference count */
unsigned int *refcount;
/* File name, and line and column numbers from source code */
const char *filename;
int line, col;
} dmnsn_astnode;
typedef dmnsn_array dmnsn_astree;
dmnsn_astnode dmnsn_new_ast_integer(long value);
dmnsn_astnode dmnsn_new_ast_float(double value);
dmnsn_astnode dmnsn_new_ast_string(const char *value);
void dmnsn_delete_astnode(dmnsn_astnode astnode);
void dmnsn_delete_astree(dmnsn_astree *astree);
/* Print an S-expression of the abstract syntax tree to `file' */
void dmnsn_print_astree_sexpr(FILE *file, const dmnsn_astree *astree);
/* Returns a readable name for an astnode type (ex. DMNSN_AST_FLOAT -> float) */
const char *dmnsn_astnode_string(dmnsn_astnode_type astnode_type);
/*
* Symbol table
*/
typedef dmnsn_array dmnsn_symbol_table;
dmnsn_symbol_table *dmnsn_new_symbol_table();
void dmnsn_delete_symbol_table(dmnsn_symbol_table *symtable);
void dmnsn_push_scope(dmnsn_symbol_table *symtable);
void dmnsn_pop_scope(dmnsn_symbol_table *symtable);
void dmnsn_local_symbol(dmnsn_symbol_table *symtable,
const char *id, dmnsn_astnode value);
void dmnsn_declare_symbol(dmnsn_symbol_table *symtable,
const char *id, dmnsn_astnode value);
void dmnsn_undef_symbol(dmnsn_symbol_table *symtable, const char *id);
dmnsn_astnode *dmnsn_find_symbol(dmnsn_symbol_table *symtable, const char *id);
/* Evaluate an arithmetic expression */
dmnsn_astnode dmnsn_eval(dmnsn_astnode astnode, dmnsn_symbol_table *symtable);
dmnsn_astnode dmnsn_eval_scalar(dmnsn_astnode astnode,
dmnsn_symbol_table *symtable);
dmnsn_astnode dmnsn_eval_vector(dmnsn_astnode astnode,
dmnsn_symbol_table *symtable);
/*
* The workhorse -- parse a file
*/
dmnsn_astree *dmnsn_parse(FILE *file, dmnsn_symbol_table *symtable);
/*
* Parser internals
*/
typedef struct dmnsn_parse_location {
const char *first_filename, *last_filename;
int first_line, last_line;
int first_column, last_column;
} dmnsn_parse_location;
typedef union dmnsn_parse_item {
char *value;
dmnsn_astnode astnode;
} dmnsn_parse_item;
#endif /* PARSE_H */
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