FreeBSD/Linux Kernel Cross Reference
sys/ddb/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  Software.Distribution@CS.CMU.EDU
     *  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.
     *
     * $FreeBSD$
     */
    
    #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_ */

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