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Aminet 30
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gnuplot-3.7src.lha
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gnuplot-3.7src
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gnuplot-3.7
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scanner.c
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C/C++ Source or Header
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1998-11-04
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11KB
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378 lines
#ifndef lint
static char *RCSid = "$Id: scanner.c,v 1.56 1998/06/18 14:55:16 ddenholm 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 */