104 lines
4.2 KiB
C
104 lines
4.2 KiB
C
/* $NetBSD: syntax.h,v 1.12 2019/02/27 04:10:56 kre Exp $ */
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/*-
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Kenneth Almquist.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#include <ctype.h>
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/* Syntax classes */
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#define CWORD 0 /* character is nothing special */
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#define CNL 1 /* newline character */
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#define CBACK 2 /* a backslash character */
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#define CSQUOTE 3 /* single quote */
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#define CDQUOTE 4 /* double quote */
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#define CBQUOTE 5 /* backwards single quote */
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#define CVAR 6 /* a dollar sign */
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#define CENDVAR 7 /* a '}' character */
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#define CLP 8 /* a left paren in arithmetic */
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#define CRP 9 /* a right paren in arithmetic */
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#define CEOF 10 /* end of file */
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#define CSPCL 11 /* these terminate a word */
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#define CCTL 12 /* like CWORD, except it must be escaped */
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#define CSBACK 13 /* a backslash in a single quote syntax */
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#define CFAKE 14 /* a delimiter that does not exist */
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/*
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* note CSBACK == (CCTL|1)
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* the code does not rely upon that, but keeping it allows a
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* smart enough compiler to optimise some tests
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*/
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/* Syntax classes for is_ functions */
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#define ISDIGIT 01 /* a digit */
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#define ISUPPER 02 /* an upper case letter */
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#define ISLOWER 04 /* a lower case letter */
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#define ISUNDER 010 /* an underscore */
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#define ISSPECL 020 /* the name of a special parameter */
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#define ISSPACE 040 /* a white space character */
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#define PEOF (CHAR_MIN - 1)
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#define PFAKE (CHAR_MIN - 2)
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#define SYNBASE (-PFAKE)
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#define BASESYNTAX (basesyntax + SYNBASE)
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#define DQSYNTAX (dqsyntax + SYNBASE)
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#define SQSYNTAX (sqsyntax + SYNBASE)
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#define ARISYNTAX (arisyntax + SYNBASE)
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/* These defines assume that the digits are contiguous (which is guaranteed) */
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#define is_digit(c) ((unsigned)((c) - '0') <= 9)
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#define sh_ctype(c) (is_type+SYNBASE)[(int)(c)]
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#define is_upper(c) (sh_ctype(c) & ISUPPER)
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#define is_lower(c) (sh_ctype(c) & ISLOWER)
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#define is_alpha(c) (sh_ctype(c) & (ISUPPER|ISLOWER))
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#define is_name(c) (sh_ctype(c) & (ISUPPER|ISLOWER|ISUNDER))
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#define is_in_name(c) (sh_ctype(c) & (ISUPPER|ISLOWER|ISUNDER|ISDIGIT))
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#define is_special(c) (sh_ctype(c) & (ISSPECL|ISDIGIT))
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#define is_space(c) (sh_ctype(c) & ISSPACE)
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#define digit_val(c) ((c) - '0')
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/* true if the arg char needs CTLESC to protect it */
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#define NEEDESC(c) (SQSYNTAX[(int)(c)] == CCTL || \
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SQSYNTAX[(int)(c)] == CSBACK)
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#define ISCTL(c) ((c) >= CTL_FIRST && (c) <= CTL_LAST)
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#if 0 /* alternative form (generally slower) */
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#define ICCTL(c) (BASESYNTAX[(int)(c)] == CCTL)
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#endif
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extern const char basesyntax[];
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extern const char dqsyntax[];
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extern const char sqsyntax[];
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extern const char arisyntax[];
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extern const char is_type[];
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