#ifndef LANG_H

#define LANG_H

#include <stdint.h>

#include "libgfs2.h"

struct lgfs2_lang_state {

	int ls_colnum;

	int ls_linenum;

	int ls_errnum;

	struct ast_node *ls_ast_root;

	struct ast_node *ls_ast_tail;

	struct ast_node *ls_interp_curr;

};

typedef enum {

	AST_NONE,

	// Statements

	AST_ST_SET,

	AST_ST_GET,

	_AST_EX_START,

	// Expressions

	AST_EX_ID,

	AST_EX_NUMBER,

	AST_EX_STRING,

	AST_EX_ADDRESS,

	AST_EX_PATH,

	AST_EX_SUBSCRIPT,

	AST_EX_OFFSET,

	AST_EX_BLOCKSPEC,

	AST_EX_STRUCTSPEC,

	AST_EX_FIELDSPEC,

	AST_EX_TYPESPEC,

	// Keywords

	AST_KW_STATE,

} ast_node_t;

enum {

	AST_INTERP_SUCCESS	= 0, // Success

	AST_INTERP_FAIL		= 1, // Failure

	AST_INTERP_INVAL	= 2, // Invalid field/type mismatch

	AST_INTERP_ERR		= 3, // Something went wrong, see errno

};

extern const char* ast_type_string[];

struct ast_node {

	ast_node_t ast_type;

	struct ast_node *ast_left;

	struct ast_node *ast_right;

	char *ast_text;

	char *ast_str;

	uint64_t ast_num;

};

extern struct ast_node *ast_new(ast_node_t type, const char *text);

extern void ast_destroy(struct ast_node **val);

#define YYSTYPE struct ast_node *

#endif /* LANG_H */