#ifndef LEXER_H
#define LEXER_H

#include <stdlib.h>
#include "preprocessor.h"

typedef enum stmt_type stmt_type;
typedef enum cond_type cond_type;
typedef struct source source;
typedef struct alt_stmt alt_stmt;
typedef struct cond_stmt cond_stmt;
typedef struct stmt stmt;
typedef void *(lex_func)(source *src, int dbg);

enum stmt_type {
	STMT_NONE,
	STMT_FUNC,
	STMT_EXPR,
	STMT_COND,
	STMT_COMP,
	NUM_STMTS
};

enum cond_type {
	COND_NONE,
	COND_IF,
	COND_FOR,
	COND_WHILE,
	COND_DO,
	NUM_CONDS
};

struct alt_stmt {
	int type;
	size_t offset;
	lex_func *lex;
};

struct cond_stmt {
	cond_type type;
	expr *expr;
	stmt *stmt;
};

struct stmt {
	stmt_type type;
	union {
		func *func;
		expr *expr;
		cond_stmt *cond_stmt;
		stmt *down;
	};
	whitespace wsp;
	stmt *next;
};

extern int lex(source *src, int dbg);
#endif