commands/ash/mksyntax.c

   1 /*-
   2  * Copyright (c) 1991, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Kenneth Almquist.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 4. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 #if 0
  34 #ifndef lint
  35 static char const copyright[] =
  36 "@(#) Copyright (c) 1991, 1993\n\
  37         The Regents of the University of California.  All rights reserved.\n";
  38 #endif /* not lint */
  39
  40 #ifndef lint
  41 static char sccsid[] = "@(#)mksyntax.c  8.2 (Berkeley) 5/4/95";
  42 #endif /* not lint */
  43 #endif
  44 #include <sys/cdefs.h>
  45 /*
  46 __FBSDID("$FreeBSD: src/bin/sh/mksyntax.c,v 1.23 2004/04/06 20:06:51 markm Exp $");
  47 */
  48
  49 /*
  50  * This program creates syntax.h and syntax.c.
  51  */
  52
  53 #include <stdio.h>
  54 #include <stdlib.h>
  55 #include <string.h>
  56 #include "parser.h"
  57
  58 struct synclass {
  59         char *name;
  60         char *comment;
  61 };
  62
  63 /* Syntax classes */
  64 struct synclass synclass[] = {
  65         { "CWORD",      "character is nothing special" },
  66         { "CNL",        "newline character" },
  67         { "CBACK",      "a backslash character" },
  68         { "CSQUOTE",    "single quote" },
  69         { "CDQUOTE",    "double quote" },
  70         { "CENDQUOTE",  "a terminating quote" },
  71         { "CBQUOTE",    "backwards single quote" },
  72         { "CVAR",       "a dollar sign" },
  73         { "CENDVAR",    "a '}' character" },
  74         { "CLP",        "a left paren in arithmetic" },
  75         { "CRP",        "a right paren in arithmetic" },
  76         { "CEOF",       "end of file" },
  77         { "CCTL",       "like CWORD, except it must be escaped" },
  78         { "CSPCL",      "these terminate a word" },
  79         { NULL,         NULL }
  80 };
  81
  82
  83 /*
  84  * Syntax classes for is_ functions.  Warning:  if you add new classes
  85  * you may have to change the definition of the is_in_name macro.
  86  */
  87 struct synclass is_entry[] = {
  88         { "ISDIGIT",    "a digit" },
  89         { "ISUPPER",    "an upper case letter" },
  90         { "ISLOWER",    "a lower case letter" },
  91         { "ISUNDER",    "an underscore" },
  92         { "ISSPECL",    "the name of a special parameter" },
  93         { NULL,         NULL }
  94 };
  95
  96 static char writer[] = "\
  97 /*\n\
  98  * This file was generated by the mksyntax program.\n\
  99  */\n\
 100 \n";
 101
 102
 103 static FILE *cfile;
 104 static FILE *hfile;
 105 static char *syntax[513];
 106 static int base;
 107 static int size;        /* number of values which a char variable can have */
 108 static int nbits;       /* number of bits in a character */
 109 static int digit_contig;/* true if digits are contiguous */
 110
 111 static void filltable(char *);
 112 static void init(void);
 113 static void add(char *, char *);
 114 static void print(char *);
 115 static void output_type_macros(void);
 116 static void digit_convert(void);
 117
 118 int
 119 main(int argc __unused, char **argv __unused)
 120 {
 121         char c;
 122         char d;
 123         int sign;
 124         int i;
 125         char buf[80];
 126         int pos;
 127         static char digit[] = "0123456789";
 128
 129         /* Create output files */
 130         if ((cfile = fopen("syntax.c", "w")) == NULL) {
 131                 perror("syntax.c");
 132                 exit(2);
 133         }
 134         if ((hfile = fopen("syntax.h", "w")) == NULL) {
 135                 perror("syntax.h");
 136                 exit(2);
 137         }
 138         fputs(writer, hfile);
 139         fputs(writer, cfile);
 140
 141         /* Determine the characteristics of chars. */
 142         c = -1;
 143         if (c < 0)
 144                 sign = 1;
 145         else
 146                 sign = 0;
 147         for (nbits = 1 ; ; nbits++) {
 148                 d = (1 << nbits) - 1;
 149                 if (d == c)
 150                         break;
 151         }
 152 #if 0
 153         printf("%s %d bit chars\n", sign? "signed" : "unsigned", nbits);
 154 #endif
 155         if (nbits > 9) {
 156                 fputs("Characters can't have more than 9 bits\n", stderr);
 157                 exit(2);
 158         }
 159         size = (1 << nbits) + 1;
 160         base = 1;
 161         if (sign)
 162                 base += 1 << (nbits - 1);
 163         digit_contig = 1;
 164         for (i = 0 ; i < 10 ; i++) {
 165                 if (digit[i] != '0' + i)
 166                         digit_contig = 0;
 167         }
 168
 169         fputs("#include <ctype.h>\n", hfile);
 170
 171         /* Generate the #define statements in the header file */
 172         fputs("/* Syntax classes */\n", hfile);
 173         for (i = 0 ; synclass[i].name ; i++) {
 174                 sprintf(buf, "#define %s %d", synclass[i].name, i);
 175                 fputs(buf, hfile);
 176                 for (pos = strlen(buf) ; pos < 32 ; pos = (pos + 8) & ~07)
 177                         putc('\t', hfile);
 178                 fprintf(hfile, "/* %s */\n", synclass[i].comment);
 179         }
 180         putc('\n', hfile);
 181         fputs("/* Syntax classes for is_ functions */\n", hfile);
 182         for (i = 0 ; is_entry[i].name ; i++) {
 183                 sprintf(buf, "#define %s %#o", is_entry[i].name, 1 << i);
 184                 fputs(buf, hfile);
 185                 for (pos = strlen(buf) ; pos < 32 ; pos = (pos + 8) & ~07)
 186                         putc('\t', hfile);
 187                 fprintf(hfile, "/* %s */\n", is_entry[i].comment);
 188         }
 189         putc('\n', hfile);
 190         fprintf(hfile, "#define SYNBASE %d\n", base);
 191         fprintf(hfile, "#define PEOF %d\n\n", -base);
 192         putc('\n', hfile);
 193         fputs("#define BASESYNTAX (basesyntax + SYNBASE)\n", hfile);
 194         fputs("#define DQSYNTAX (dqsyntax + SYNBASE)\n", hfile);
 195         fputs("#define SQSYNTAX (sqsyntax + SYNBASE)\n", hfile);
 196         fputs("#define ARISYNTAX (arisyntax + SYNBASE)\n", hfile);
 197         putc('\n', hfile);
 198         output_type_macros();           /* is_digit, etc. */
 199         putc('\n', hfile);
 200
 201         /* Generate the syntax tables. */
 202         fputs("#include \"shell.h\"\n", cfile);
 203         fputs("#include \"syntax.h\"\n\n", cfile);
 204         init();
 205         fputs("/* syntax table used when not in quotes */\n", cfile);
 206         add("\n", "CNL");
 207         add("\\", "CBACK");
 208         add("'", "CSQUOTE");
 209         add("\"", "CDQUOTE");
 210         add("`", "CBQUOTE");
 211         add("$", "CVAR");
 212         add("}", "CENDVAR");
 213         add("<>();&| \t", "CSPCL");
 214         print("basesyntax");
 215         init();
 216         fputs("\n/* syntax table used when in double quotes */\n", cfile);
 217         add("\n", "CNL");
 218         add("\\", "CBACK");
 219         add("\"", "CENDQUOTE");
 220         add("`", "CBQUOTE");
 221         add("$", "CVAR");
 222         add("}", "CENDVAR");
 223         /* ':/' for tilde expansion, '-' for [a\-x] pattern ranges */
 224         add("!*?[=~:/-", "CCTL");
 225         print("dqsyntax");
 226         init();
 227         fputs("\n/* syntax table used when in single quotes */\n", cfile);
 228         add("\n", "CNL");
 229         add("'", "CENDQUOTE");
 230         /* ':/' for tilde expansion, '-' for [a\-x] pattern ranges */
 231         add("!*?[=~:/-", "CCTL");
 232         print("sqsyntax");
 233         init();
 234         fputs("\n/* syntax table used when in arithmetic */\n", cfile);
 235         add("\n", "CNL");
 236         add("\\", "CBACK");
 237         add("`", "CBQUOTE");
 238         add("'", "CSQUOTE");
 239         add("\"", "CDQUOTE");
 240         add("$", "CVAR");
 241         add("}", "CENDVAR");
 242         add("(", "CLP");
 243         add(")", "CRP");
 244         print("arisyntax");
 245         filltable("0");
 246         fputs("\n/* character classification table */\n", cfile);
 247         add("0123456789", "ISDIGIT");
 248         add("abcdefghijklmnopqrstucvwxyz", "ISLOWER");
 249         add("ABCDEFGHIJKLMNOPQRSTUCVWXYZ", "ISUPPER");
 250         add("_", "ISUNDER");
 251         add("#?$!-*@", "ISSPECL");
 252         print("is_type");
 253         if (! digit_contig)
 254                 digit_convert();
 255         exit(0);
 256 }
 257
 258
 259
 260 /*
 261  * Clear the syntax table.
 262  */
 263
 264 static void
 265 filltable(char *dftval)
 266 {
 267         int i;
 268
 269         for (i = 0 ; i < size ; i++)
 270                 syntax[i] = dftval;
 271 }
 272
 273
 274 /*
 275  * Initialize the syntax table with default values.
 276  */
 277
 278 static void
 279 init(void)
 280 {
 281         filltable("CWORD");
 282         syntax[0] = "CEOF";
 283         syntax[base + CTLESC] = "CCTL";
 284         syntax[base + CTLVAR] = "CCTL";
 285         syntax[base + CTLENDVAR] = "CCTL";
 286         syntax[base + CTLBACKQ] = "CCTL";
 287         syntax[base + CTLBACKQ + CTLQUOTE] = "CCTL";
 288         syntax[base + CTLARI] = "CCTL";
 289         syntax[base + CTLENDARI] = "CCTL";
 290         syntax[base + CTLQUOTEMARK] = "CCTL";
 291 }
 292
 293
 294 /*
 295  * Add entries to the syntax table.
 296  */
 297
 298 static void
 299 add(char *p, char *type)
 300 {
 301         while (*p)
 302                 syntax[*p++ + base] = type;
 303 }
 304
 305
 306
 307 /*
 308  * Output the syntax table.
 309  */
 310
 311 static void
 312 print(char *name)
 313 {
 314         int i;
 315         int col;
 316
 317         fprintf(hfile, "extern const char %s[];\n", name);
 318         fprintf(cfile, "const char %s[%d] = {\n", name, size);
 319         col = 0;
 320         for (i = 0 ; i < size ; i++) {
 321                 if (i == 0) {
 322                         fputs("      ", cfile);
 323                 } else if ((i & 03) == 0) {
 324                         fputs(",\n      ", cfile);
 325                         col = 0;
 326                 } else {
 327                         putc(',', cfile);
 328                         while (++col < 9 * (i & 03))
 329                                 putc(' ', cfile);
 330                 }
 331                 fputs(syntax[i], cfile);
 332                 col += strlen(syntax[i]);
 333         }
 334         fputs("\n};\n", cfile);
 335 }
 336
 337
 338
 339 /*
 340  * Output character classification macros (e.g. is_digit).  If digits are
 341  * contiguous, we can test for them quickly.
 342  */
 343
 344 static char *macro[] = {
 345         "#define is_digit(c)\t((is_type+SYNBASE)[c] & ISDIGIT)",
 346         "#define is_alpha(c)\t((c) != PEOF && ((c) < CTLESC || (c) > CTLQUOTEMARK) && isalpha((unsigned char) (c)))",
 347         "#define is_name(c)\t((c) != PEOF && ((c) < CTLESC || (c) > CTLQUOTEMARK) && ((c) == '_' || isalpha((unsigned char) (c))))",
 348         "#define is_in_name(c)\t((c) != PEOF && ((c) < CTLESC || (c) > CTLQUOTEMARK) && ((c) == '_' || isalnum((unsigned char) (c))))",
 349         "#define is_special(c)\t((is_type+SYNBASE)[c] & (ISSPECL|ISDIGIT))",
 350         NULL
 351 };
 352
 353 static void
 354 output_type_macros(void)
 355 {
 356         char **pp;
 357
 358         if (digit_contig)
 359                 macro[0] = "#define is_digit(c)\t((unsigned)((c) - '0') <= 9)";
 360         for (pp = macro ; *pp ; pp++)
 361                 fprintf(hfile, "%s\n", *pp);
 362         if (digit_contig)
 363                 fputs("#define digit_val(c)\t((c) - '0')\n", hfile);
 364         else
 365                 fputs("#define digit_val(c)\t(digit_value[c])\n", hfile);
 366 }
 367
 368
 369
 370 /*
 371  * Output digit conversion table (if digits are not contiguous).
 372  */
 373
 374 static void
 375 digit_convert(void)
 376 {
 377         int maxdigit;
 378         static char digit[] = "0123456789";
 379         char *p;
 380         int i;
 381
 382         maxdigit = 0;
 383         for (p = digit ; *p ; p++)
 384                 if (*p > maxdigit)
 385                         maxdigit = *p;
 386         fputs("extern const char digit_value[];\n", hfile);
 387         fputs("\n\nconst char digit_value[] = {\n", cfile);
 388         for (i = 0 ; i <= maxdigit ; i++) {
 389                 for (p = digit ; *p && *p != i ; p++);
 390                 if (*p == '\0')
 391                         p = digit;
 392                 fprintf(cfile, "      %d,\n", (int)(p - digit));
 393         }
 394         fputs("};\n", cfile);
 395 }
 396
 397 /*
 398  * $PchId: mksyntax.c,v 1.7 2006/05/23 12:04:27 philip Exp $
 399  */