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mirror of https://git.FreeBSD.org/src.git synced 2024-12-22 11:17:19 +00:00
freebsd/bin/sh/mksyntax.c
2011-12-28 23:51:17 +00:00

397 lines
10 KiB
C

/*-
* Copyright (c) 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Kenneth Almquist.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#if 0
#ifndef lint
static char const copyright[] =
"@(#) Copyright (c) 1991, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
static char sccsid[] = "@(#)mksyntax.c 8.2 (Berkeley) 5/4/95";
#endif /* not lint */
#endif
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*
* This program creates syntax.h and syntax.c.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "parser.h"
struct synclass {
const char *name;
const char *comment;
};
/* Syntax classes */
struct synclass synclass[] = {
{ "CWORD", "character is nothing special" },
{ "CNL", "newline character" },
{ "CBACK", "a backslash character" },
{ "CSBACK", "a backslash character in single quotes" },
{ "CSQUOTE", "single quote" },
{ "CDQUOTE", "double quote" },
{ "CENDQUOTE", "a terminating quote" },
{ "CBQUOTE", "backwards single quote" },
{ "CVAR", "a dollar sign" },
{ "CENDVAR", "a '}' character" },
{ "CLP", "a left paren in arithmetic" },
{ "CRP", "a right paren in arithmetic" },
{ "CEOF", "end of file" },
{ "CCTL", "like CWORD, except it must be escaped" },
{ "CSPCL", "these terminate a word" },
{ "CIGN", "character should be ignored" },
{ NULL, NULL }
};
/*
* Syntax classes for is_ functions. Warning: if you add new classes
* you may have to change the definition of the is_in_name macro.
*/
struct synclass is_entry[] = {
{ "ISDIGIT", "a digit" },
{ "ISUPPER", "an upper case letter" },
{ "ISLOWER", "a lower case letter" },
{ "ISUNDER", "an underscore" },
{ "ISSPECL", "the name of a special parameter" },
{ NULL, NULL }
};
static char writer[] = "\
/*\n\
* This file was generated by the mksyntax program.\n\
*/\n\
\n";
static FILE *cfile;
static FILE *hfile;
static const char *syntax[513];
static int base;
static int size; /* number of values which a char variable can have */
static int nbits; /* number of bits in a character */
static int digit_contig;/* true if digits are contiguous */
static void filltable(const char *);
static void init(void);
static void add(const char *, const char *);
static void print(const char *);
static void output_type_macros(void);
static void digit_convert(void);
int
main(int argc __unused, char **argv __unused)
{
char c;
char d;
int sign;
int i;
char buf[80];
int pos;
static char digit[] = "0123456789";
/* Create output files */
if ((cfile = fopen("syntax.c", "w")) == NULL) {
perror("syntax.c");
exit(2);
}
if ((hfile = fopen("syntax.h", "w")) == NULL) {
perror("syntax.h");
exit(2);
}
fputs(writer, hfile);
fputs(writer, cfile);
/* Determine the characteristics of chars. */
c = -1;
sign = (c > 0) ? 0 : 1;
for (nbits = 1 ; ; nbits++) {
d = (1 << nbits) - 1;
if (d == c)
break;
}
#if 0
printf("%s %d bit chars\n", sign? "signed" : "unsigned", nbits);
#endif
if (nbits > 9) {
fputs("Characters can't have more than 9 bits\n", stderr);
exit(2);
}
size = (1 << nbits) + 1;
base = 1;
if (sign)
base += 1 << (nbits - 1);
digit_contig = 1;
for (i = 0 ; i < 10 ; i++) {
if (digit[i] != '0' + i)
digit_contig = 0;
}
fputs("#include <sys/cdefs.h>\n", hfile);
fputs("#include <ctype.h>\n", hfile);
/* Generate the #define statements in the header file */
fputs("/* Syntax classes */\n", hfile);
for (i = 0 ; synclass[i].name ; i++) {
sprintf(buf, "#define %s %d", synclass[i].name, i);
fputs(buf, hfile);
for (pos = strlen(buf) ; pos < 32 ; pos = (pos + 8) & ~07)
putc('\t', hfile);
fprintf(hfile, "/* %s */\n", synclass[i].comment);
}
putc('\n', hfile);
fputs("/* Syntax classes for is_ functions */\n", hfile);
for (i = 0 ; is_entry[i].name ; i++) {
sprintf(buf, "#define %s %#o", is_entry[i].name, 1 << i);
fputs(buf, hfile);
for (pos = strlen(buf) ; pos < 32 ; pos = (pos + 8) & ~07)
putc('\t', hfile);
fprintf(hfile, "/* %s */\n", is_entry[i].comment);
}
putc('\n', hfile);
fprintf(hfile, "#define SYNBASE %d\n", base);
fprintf(hfile, "#define PEOF %d\n\n", -base);
putc('\n', hfile);
fputs("#define BASESYNTAX (basesyntax + SYNBASE)\n", hfile);
fputs("#define DQSYNTAX (dqsyntax + SYNBASE)\n", hfile);
fputs("#define SQSYNTAX (sqsyntax + SYNBASE)\n", hfile);
fputs("#define ARISYNTAX (arisyntax + SYNBASE)\n", hfile);
putc('\n', hfile);
output_type_macros(); /* is_digit, etc. */
putc('\n', hfile);
/* Generate the syntax tables. */
fputs("#include \"shell.h\"\n", cfile);
fputs("#include \"syntax.h\"\n\n", cfile);
init();
fputs("/* syntax table used when not in quotes */\n", cfile);
add("\n", "CNL");
add("\\", "CBACK");
add("'", "CSQUOTE");
add("\"", "CDQUOTE");
add("`", "CBQUOTE");
add("$", "CVAR");
add("}", "CENDVAR");
add("<>();&| \t", "CSPCL");
print("basesyntax");
init();
fputs("\n/* syntax table used when in double quotes */\n", cfile);
add("\n", "CNL");
add("\\", "CBACK");
add("\"", "CENDQUOTE");
add("`", "CBQUOTE");
add("$", "CVAR");
add("}", "CENDVAR");
/* ':/' for tilde expansion, '-^]' for [a\-x] pattern ranges */
add("!*?[]=~:/-^", "CCTL");
print("dqsyntax");
init();
fputs("\n/* syntax table used when in single quotes */\n", cfile);
add("\n", "CNL");
add("\\", "CSBACK");
add("'", "CENDQUOTE");
/* ':/' for tilde expansion, '-^]' for [a\-x] pattern ranges */
add("!*?[]=~:/-^", "CCTL");
print("sqsyntax");
init();
fputs("\n/* syntax table used when in arithmetic */\n", cfile);
add("\n", "CNL");
add("\\", "CBACK");
add("`", "CBQUOTE");
add("\"", "CIGN");
add("$", "CVAR");
add("}", "CENDVAR");
add("(", "CLP");
add(")", "CRP");
print("arisyntax");
filltable("0");
fputs("\n/* character classification table */\n", cfile);
add("0123456789", "ISDIGIT");
add("abcdefghijklmnopqrstuvwxyz", "ISLOWER");
add("ABCDEFGHIJKLMNOPQRSTUVWXYZ", "ISUPPER");
add("_", "ISUNDER");
add("#?$!-*@", "ISSPECL");
print("is_type");
if (! digit_contig)
digit_convert();
exit(0);
}
/*
* Clear the syntax table.
*/
static void
filltable(const char *dftval)
{
int i;
for (i = 0 ; i < size ; i++)
syntax[i] = dftval;
}
/*
* Initialize the syntax table with default values.
*/
static void
init(void)
{
filltable("CWORD");
syntax[0] = "CEOF";
syntax[base + CTLESC] = "CCTL";
syntax[base + CTLVAR] = "CCTL";
syntax[base + CTLENDVAR] = "CCTL";
syntax[base + CTLBACKQ] = "CCTL";
syntax[base + CTLBACKQ + CTLQUOTE] = "CCTL";
syntax[base + CTLARI] = "CCTL";
syntax[base + CTLENDARI] = "CCTL";
syntax[base + CTLQUOTEMARK] = "CCTL";
syntax[base + CTLQUOTEEND] = "CCTL";
}
/*
* Add entries to the syntax table.
*/
static void
add(const char *p, const char *type)
{
while (*p)
syntax[*p++ + base] = type;
}
/*
* Output the syntax table.
*/
static void
print(const char *name)
{
int i;
int col;
fprintf(hfile, "extern const char %s[];\n", name);
fprintf(cfile, "const char %s[%d] = {\n", name, size);
col = 0;
for (i = 0 ; i < size ; i++) {
if (i == 0) {
fputs(" ", cfile);
} else if ((i & 03) == 0) {
fputs(",\n ", cfile);
col = 0;
} else {
putc(',', cfile);
while (++col < 9 * (i & 03))
putc(' ', cfile);
}
fputs(syntax[i], cfile);
col += strlen(syntax[i]);
}
fputs("\n};\n", cfile);
}
/*
* Output character classification macros (e.g. is_digit). If digits are
* contiguous, we can test for them quickly.
*/
static const char *macro[] = {
"#define is_digit(c)\t((is_type+SYNBASE)[(int)c] & ISDIGIT)",
"#define is_eof(c)\t((c) == PEOF)",
"#define is_alpha(c)\t((is_type+SYNBASE)[(int)c] & (ISUPPER|ISLOWER))",
"#define is_name(c)\t((is_type+SYNBASE)[(int)c] & (ISUPPER|ISLOWER|ISUNDER))",
"#define is_in_name(c)\t((is_type+SYNBASE)[(int)c] & (ISUPPER|ISLOWER|ISUNDER|ISDIGIT))",
"#define is_special(c)\t((is_type+SYNBASE)[(int)c] & (ISSPECL|ISDIGIT))",
NULL
};
static void
output_type_macros(void)
{
const char **pp;
if (digit_contig)
macro[0] = "#define is_digit(c)\t((unsigned int)((c) - '0') <= 9)";
for (pp = macro ; *pp ; pp++)
fprintf(hfile, "%s\n", *pp);
if (digit_contig)
fputs("#define digit_val(c)\t((c) - '0')\n", hfile);
else
fputs("#define digit_val(c)\t(digit_value[c])\n", hfile);
}
/*
* Output digit conversion table (if digits are not contiguous).
*/
static void
digit_convert(void)
{
int maxdigit;
static char digit[] = "0123456789";
char *p;
int i;
maxdigit = 0;
for (p = digit ; *p ; p++)
if (*p > maxdigit)
maxdigit = *p;
fputs("extern const char digit_value[];\n", hfile);
fputs("\n\nconst char digit_value[] = {\n", cfile);
for (i = 0 ; i <= maxdigit ; i++) {
for (p = digit ; *p && *p != i ; p++);
if (*p == '\0')
p = digit;
fprintf(cfile, " %d,\n", (int)(p - digit));
}
fputs("};\n", cfile);
}