db_lex.h

/*-
 * SPDX-License-Identifier: MIT-CMU
 *
 * Mach Operating System
 * Copyright (c) 1991,1990 Carnegie Mellon University
 * All Rights Reserved.
 *
 * Permission to use, copy, modify and distribute this software and its
 * documentation is hereby granted, provided that both the copyright
 * notice and this permission notice appear in all copies of the
 * software, derivative works or modified versions, and any portions
 * thereof, and that both notices appear in supporting documentation.
 *
 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS
 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
 *
 * Carnegie Mellon requests users of this software to return to
 *
 *  Software Distribution Coordinator  or  [email protected]
 *  School of Computer Science
 *  Carnegie Mellon University
 *  Pittsburgh PA 15213-3890
 *
 * any improvements or extensions that they make and grant Carnegie the
 * rights to redistribute these changes.
 */

#ifndef _DDB_DB_LEX_H_
#define	_DDB_DB_LEX_H_

/*
 *	Author: David B. Golub, Carnegie Mellon University
 *	Date:	7/90
 */
/*
 * Lexical analyzer.
 */

/*
 * Options and flags can configure db_read_token() => db_lex() behavior.
 *
 * When a radix other than DRT_DEFAULT_RADIX is used, it overrides
 * auto-detection, as well as the user-specified db_radix, in db_lex() of
 * 'tNUMBER' tokens.
 */
enum {
	/* Infer or use db_radix using the old logic. */
	DRT_DEFAULT_RADIX = 0,
	/* The following set an explicit base for tNUMBER lex. */
	DRT_OCTAL,
	DRT_DECIMAL,
	DRT_HEXADECIMAL,
};
#define	DRT_RADIX_MASK	0x3
/*
 * Flag bit powers of two for db_read_token_flags.
 * The low 2 bits are reserved for radix selection.
 *
 * WSPACE: Yield explicit tWSPACE tokens when one or more whitespace characters
 *         is consumed.
 * HEX:    Allow tNUMBER tokens to start with 'A'-'F' without explicit "0x"
 *         prefix.
 */
enum {
	_DRT_WSPACE = 2,
	_DRT_HEX,
};
#ifndef BIT
#define	BIT(n)	(1ull << (n))
#endif
enum {
	DRT_WSPACE = BIT(_DRT_WSPACE),
	DRT_HEX = BIT(_DRT_HEX),
};
#define	DRT_VALID_FLAGS_MASK	((int)DRT_RADIX_MASK | \
    DRT_WSPACE | \
    DRT_HEX)

void	 db_flush_lex(void);
char	*db_get_line(void);
void	 db_inject_line(const char *command);
int	 db_read_line(void);
int	 db_read_token_flags(int);
void	 db_unread_token(int t);

static inline int
db_read_token(void)
{
	return (db_read_token_flags(0));
}

extern db_expr_t	db_tok_number;
#define	TOK_STRING_SIZE		120
extern char	db_tok_string[TOK_STRING_SIZE];

#define	tEOF		(-1)
#define	tEOL		1
#define	tNUMBER		2
#define	tIDENT		3
#define	tPLUS		4
#define	tMINUS		5
#define	tDOT		6
#define	tSTAR		7
#define	tSLASH		8
#define	tEQ		9
#define	tLPAREN		10
#define	tRPAREN		11
#define	tPCT		12
#define	tHASH		13
#define	tCOMMA		14
#define	tDITTO		15
#define	tDOLLAR		16
#define	tEXCL		17
#define	tSHIFT_L	18
#define	tSHIFT_R	19
#define	tDOTDOT		20
#define	tSEMI		21
#define	tLOG_EQ		22
#define	tLOG_NOT_EQ	23
#define	tLESS		24
#define	tLESS_EQ	25
#define	tGREATER	26
#define	tGREATER_EQ	27
#define	tBIT_AND	28
#define	tBIT_OR		29
#define	tLOG_AND	30
#define	tLOG_OR		31
#define	tSTRING		32
#define	tQUESTION	33
#define	tBIT_NOT	34
#define	tWSPACE		35
#define	tCOLON		36
#define	tCOLONCOLON	37

#endif /* !_DDB_DB_LEX_H_ */