1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377
|
#ifndef lint
static char *RCSid = "$Id: scanner.c,v 1.10 1998/11/04 14:49:57 lhecking Exp $";
#endif
/* GNUPLOT - scanner.c */
/*[
* Copyright 1986 - 1993, 1998 Thomas Williams, Colin Kelley
*
* Permission to use, copy, and distribute this software and its
* documentation for any purpose with or without fee is hereby granted,
* provided that the above copyright notice appear in all copies and
* that both that copyright notice and this permission notice appear
* in supporting documentation.
*
* Permission to modify the software is granted, but not the right to
* distribute the complete modified source code. Modifications are to
* be distributed as patches to the released version. Permission to
* distribute binaries produced by compiling modified sources is granted,
* provided you
* 1. distribute the corresponding source modifications from the
* released version in the form of a patch file along with the binaries,
* 2. add special version identification to distinguish your version
* in addition to the base release version number,
* 3. provide your name and address as the primary contact for the
* support of your modified version, and
* 4. retain our contact information in regard to use of the base
* software.
* Permission to distribute the released version of the source code along
* with corresponding source modifications in the form of a patch file is
* granted with same provisions 2 through 4 for binary distributions.
*
* This software is provided "as is" without express or implied warranty
* to the extent permitted by applicable law.
]*/
#include "plot.h"
static int get_num __PROTO((char str[]));
static void substitute __PROTO((char *str, int max));
#ifdef AMIGA_AC_5
#define O_RDONLY 0
int open(const char *_name, int _mode,...);
int close(int);
#endif /* AMIGA_AC_5 */
#ifdef VMS
#include <descrip.h>
#define MAILBOX "PLOT$MAILBOX"
#define pclose(f) fclose(f)
#ifdef __DECC
#include <lib$routines.h> /* avoid some IMPLICITFNC warnings */
#include <starlet.h>
#endif /* __DECC */
#endif /* VMS */
#define isident(c) (isalnum(c) || (c) == '_')
#ifndef STDOUT
#define STDOUT 1
#endif
#define LBRACE '{'
#define RBRACE '}'
#define APPEND_TOKEN {token[t_num].length++; current++;}
#define SCAN_IDENTIFIER while (isident((int)expression[current + 1]))\
APPEND_TOKEN
static int t_num; /* number of token I'm working on */
/*
* scanner() breaks expression[] into lexical units, storing them in token[].
* The total number of tokens found is returned as the function value.
* Scanning will stop when '\0' is found in expression[], or when token[]
* is full.
*
* Scanning is performed by following rules:
*
* Current char token should contain
* ------------- -----------------------
* 1. alpha,_ all following alpha-numerics
* 2. digit 0 or more following digits, 0 or 1 decimal point,
* 0 or more digits, 0 or 1 'e' or 'E',
* 0 or more digits.
* 3. ^,+,-,/ only current char
* %,~,(,)
* [,],;,:,
* ?,comma
* $ for using patch (div)
* 4. &,|,=,* current char; also next if next is same
* 5. !,<,> current char; also next if next is =
* 6. ", ' all chars up until matching quote
* 7. # this token cuts off scanning of the line (DFK).
*
* white space between tokens is ignored
*/
int scanner(expression)
char expression[];
{
register int current; /* index of current char in expression[] */
register int quote;
char brace;
for (current = t_num = 0; expression[current] != NUL; current++) {
again:
if (t_num + 1 >= token_table_size) {
/* leave space for dummy end token */
extend_token_table();
}
if (isspace((int) expression[current]))
continue; /* skip the whitespace */
token[t_num].start_index = current;
token[t_num].length = 1;
token[t_num].is_token = TRUE; /* to start with... */
if (expression[current] == '`') {
substitute(&expression[current], MAX_LINE_LEN - current);
goto again;
}
/* allow _ to be the first character of an identifier */
if (isalpha((int) expression[current]) || expression[current] == '_') {
SCAN_IDENTIFIER;
} else if (isdigit((int) expression[current]) || expression[current] == '.') {
token[t_num].is_token = FALSE;
token[t_num].length = get_num(&expression[current]);
current += (token[t_num].length - 1);
} else if (expression[current] == LBRACE) {
token[t_num].is_token = FALSE;
token[t_num].l_val.type = CMPLX;
#ifdef __PUREC__
{
char l[80];
if ((sscanf(&expression[++current], "%lf,%lf%[ }]s",
&token[t_num].l_val.v.cmplx_val.real,
&token[t_num].l_val.v.cmplx_val.imag,
&l) != 3) || (!strchr(l, RBRACE)))
int_error("invalid complex constant", t_num);
}
#else
if ((sscanf(&expression[++current], "%lf , %lf %c",
&token[t_num].l_val.v.cmplx_val.real,
&token[t_num].l_val.v.cmplx_val.imag,
&brace) != 3) || (brace != RBRACE))
int_error("invalid complex constant", t_num);
#endif
token[t_num].length += 2;
while (expression[++current] != RBRACE) {
token[t_num].length++;
if (expression[current] == NUL) /* { for vi % */
int_error("no matching '}'", t_num);
}
} else if (expression[current] == '\'' || expression[current] == '\"') {
token[t_num].length++;
quote = expression[current];
while (expression[++current] != quote) {
if (!expression[current]) {
expression[current] = quote;
expression[current + 1] = NUL;
break;
} else if (expression[current] == '\\'
&& expression[current + 1]) {
current++;
token[t_num].length += 2;
} else
token[t_num].length++;
}
} else
switch (expression[current]) {
case '#': /* DFK: add comments to gnuplot */
goto endline; /* ignore the rest of the line */
case '^':
case '+':
case '-':
case '/':
case '%':
case '~':
case '(':
case ')':
case '[':
case ']':
case ';':
case ':':
case '?':
case ',':
case '$': /* div */
break;
case '&':
case '|':
case '=':
case '*':
if (expression[current] == expression[current + 1])
APPEND_TOKEN;
break;
case '!':
case '<':
case '>':
if (expression[current + 1] == '=')
APPEND_TOKEN;
break;
default:
int_error("invalid character", t_num);
}
++t_num; /* next token if not white space */
}
endline: /* comments jump here to ignore line */
/* Now kludge an extra token which points to '\0' at end of expression[].
This is useful so printerror() looks nice even if we've fallen off the
line. */
token[t_num].start_index = current;
token[t_num].length = 0;
/* print 3+4 then print 3+ is accepted without
* this, since string is ignored if it is not
* a token
*/
token[t_num].is_token = TRUE;
return (t_num);
}
static int get_num(str)
char str[];
{
register int count = 0;
register long lval;
token[t_num].is_token = FALSE;
token[t_num].l_val.type = INTGR; /* assume unless . or E found */
while (isdigit((int) str[count]))
count++;
if (str[count] == '.') {
token[t_num].l_val.type = CMPLX;
/* swallow up digits until non-digit */
while (isdigit((int) str[++count]))
;
/* now str[count] is other than a digit */
}
if (str[count] == 'e' || str[count] == 'E') {
token[t_num].l_val.type = CMPLX;
/* modified if statement to allow + sign in exponent
rjl 26 July 1988 */
count++;
if (str[count] == '-' || str[count] == '+')
count++;
if (!isdigit((int) str[count])) {
token[t_num].start_index += count;
int_error("expecting exponent", t_num);
}
while (isdigit((int) str[++count]));
}
if (token[t_num].l_val.type == INTGR) {
lval = atol(str);
if ((token[t_num].l_val.v.int_val = lval) != lval)
int_error("integer overflow; change to floating point", t_num);
} else {
token[t_num].l_val.v.cmplx_val.imag = 0.0;
token[t_num].l_val.v.cmplx_val.real = atof(str);
}
return (count);
}
#if defined(VMS) || defined(PIPES) || (defined(ATARI) || defined(MTOS)) && defined(__PUREC__)
/* this really ought to make use of the dynamic-growth of the
* input line in 3.6. And it definitely should not have
* static arrays !
*/
/* A macro to reduce clutter ... */
# ifdef AMIGA_AC_5
# define CLOSE_FILE_OR_PIPE ((void) close(fd))
# elif (defined(ATARI) || defined(MTOS)) && defined(__PUREC__)
# define CLOSE_FILE_OR_PIPE ((void) fclose(f); (void) unlink(atari_tmpfile))
# else /* Rest of the world */
# define CLOSE_FILE_OR_PIPE ((void) pclose(f))
# endif
static void substitute(str, max) /* substitute output from ` ` */
char *str;
int max;
{
register char *last;
register int i, c;
register FILE *f;
# ifdef AMIGA_AC_5
int fd;
# elif (defined(ATARI) || defined(MTOS)) && defined(__PUREC__)
char *atari_tmpfile;
char *atari_pgm[MAX_LINE_LEN+100];
# endif /* !AMIGA_AC_5 */
static char pgm[MAX_LINE_LEN+1], output[MAX_LINE_LEN+1];
# ifdef VMS
int chan, one = 1;
static $DESCRIPTOR(pgmdsc, pgm);
static $DESCRIPTOR(lognamedsc, MAILBOX);
# endif /* VMS */
/* forgive missing closing backquote at end of line */
i = 0;
last = str;
while (*++last) {
if (*last == '`') {
++last; /* move past it */
break;
}
pgm[i++] = *last;
}
pgm[i] = NUL; /* end with null */
max -= strlen(last); /* max is now the max length of output sub. */
# ifdef VMS
pgmdsc.dsc$w_length = i;
if (!((vaxc$errno = sys$crembx(0, &chan, 0, 0, 0, 0, &lognamedsc)) & 1))
os_error("sys$crembx failed", NO_CARET);
if (!((vaxc$errno = lib$spawn(&pgmdsc, 0, &lognamedsc, &one)) & 1))
os_error("lib$spawn failed", NO_CARET);
if ((f = fopen(MAILBOX, "r")) == NULL)
os_error("mailbox open failed", NO_CARET);
# elif (defined(ATARI) || defined(MTOS)) && defined(__PUREC__)
if (system(NULL) == 0)
os_error("no command shell", NO_CARET);
if ((strlen(atari_tmpfile) + strlen(pgm) + 5) > MAX_LINE_LEN + 100)
os_error("sorry, command to long", NO_CARET);
atari_tmpfile = tmpnam(NULL);
strcpy(atari_pgm, pgm);
strcat(atari_pgm, " >> ");
strcat(atari_pgm, atari_tmpfile);
system(atari_pgm);
if ((f = fopen(atari_tmpfile, "r")) == NULL)
# elif defined(AMIGA_AC_5)
if ((fd = open(pgm, "O_RDONLY")) == -1)
# else /* everyone else */
if ((f = popen(pgm, "r")) == NULL)
os_error("popen failed", NO_CARET);
# endif /* !VMS */
i = 0;
while ((c = getc(f)) != EOF) {
output[i++] = ((c == '\n') ? ' ' : c); /* newlines become blanks */
if (i == max) {
CLOSE_FILE_OR_PIPE;
int_error("substitution overflow", t_num);
}
}
CLOSE_FILE_OR_PIPE;
if (i + strlen(last) > max)
int_error("substitution overflowed rest of line", t_num);
/* tack on rest of line to output */
safe_strncpy(output + i, last, MAX_LINE_LEN - i);
/* now replace ` ` with output */
safe_strncpy(str, output, max);
screen_ok = FALSE;
}
#else /* VMS || PIPES || ATARI && PUREC */
static void substitute(str, max)
char *str;
int max;
{
char line[100];
sprintf(line, "substitution not supported by %s", OS);
int_error(line, t_num);
}
#endif /* unix || VMS || PIPES || ATARI && PUREC */
|