gnuplot-old/src/scanner.c at pm3d · gnuplot/gnuplot-old · GitHub

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#ifndef lint

static char *RCSid() { return RCSid("$Id: scanner.c,v 1.14 1999/11/08 19:24:33 lhecking Exp $"); }

#endif

/* GNUPLOT - scanner.c */

/*[

* 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 "scanner.h"

#include "alloc.h"

#include "command.h"

#include "util.h"

static int get_num __PROTO((char str[]));

static void substitute __PROTO((char **strp, size_t *str_lenp, int current));

#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) == '_')

#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. extend_input_line() is called to extend

* expression array if needed.

* 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).

* 8. ` (command substitution: all characters through the

* matching backtic are replaced by the output of

* the contained command, then scanning is restarted.)

* white space between tokens is ignored

int

scanner(expressionp, expressionlenp)

char **expressionp;

size_t *expressionlenp;

{

char *expression = *expressionp;

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(expressionp, expressionlenp, current);

expression = *expressionp; /* expression might have moved */

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(t_num, "invalid complex constant");

}

#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(t_num, "invalid complex constant");

#endif

token[t_num].length += 2;

while (expression[++current] != RBRACE) {

token[t_num].length++;

if (expression[current] == NUL) /* { for vi % */

int_error(t_num, "no matching '}'");

}

} 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 if (quote == '\"' && expression[current] == '`') {

substitute(expressionp, expressionlenp, current);

expression = *expressionp; /* it might have moved */

current--;

} 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(t_num, "invalid character");

}

++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[];

{

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(t_num, "expecting exponent");

}

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(t_num, "integer overflow; change to floating point");

} 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__)

/* 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

/* substitute output from ` `

* *strp points to the input string. (*strp)[current] is expected to

* be the initial back tic. Characters through the following back tic

* are replaced by the output of the command. extend_input_line()

* is called to extend *strp array if needed.

static void

substitute(strp, str_lenp, current)

char **strp;

size_t *str_lenp;

int current;

{

# ifdef AMIGA_AC_5

int fd;

# elif (defined(ATARI) || defined(MTOS)) && defined(__PUREC__)

char *atari_tmpfile;

# endif /* !AMIGA_AC_5 */

char *str, *pgm, *rest = NULL;

size_t pgm_len, rest_len = 0;

# ifdef VMS

int chan, one = 1;

struct dsc$descriptor_s pgmdsc = {0, DSC$K_DTYPE_T, DSC$K_CLASS_S, 0};

static $DESCRIPTOR(lognamedsc, MAILBOX);

# endif /* VMS */

/* forgive missing closing backquote at end of line */

str = *strp + current;

last = str;

while (*++last) {

if (*last == '`')

break;

}

pgm_len = last - str;

pgm = gp_alloc(pgm_len, "command string");

safe_strncpy(pgm, str + 1, pgm_len); /* omit ` to leave room for NUL */

/* save rest of line, if any */

if (*last) {

last++; /* advance past ` */

rest_len = strlen(last) + 1;

if (rest_len > 1) {

rest = gp_alloc(rest_len, "input line copy");

strcpy(rest, last);

}

# ifdef VMS

pgmdsc.dsc$a_pointer = pgm;

pgmdsc.dsc$w_length = pgm_len;

if (!((vaxc$errno = sys$crembx(0, &chan, 0, 0, 0, 0, &lognamedsc)) & 1))

os_error(NO_CARET, "sys$crembx failed");

if (!((vaxc$errno = lib$spawn(&pgmdsc, 0, &lognamedsc, &one)) & 1))

os_error(NO_CARET, "lib$spawn failed");

if ((f = fopen(MAILBOX, "r")) == NULL)

os_error(NO_CARET, "mailbox open failed");

# elif (defined(ATARI) || defined(MTOS)) && defined(__PUREC__)

if (system(NULL) == 0)

os_error(NO_CARET, "no command shell");

atari_tmpfile = tmpnam(NULL);

gp_realloc(pgm, pgm_len + 5 + strlen(atari_tmpfile), "command string");

strcat(pgm, " >> ");

strcat(pgm, atari_tmpfile);

system(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(NO_CARET, "popen failed");

# endif /* !VMS */

free(pgm);

/* now replace ` ` with output */

while (1) {

# if defined(AMIGA_AC_5)

char ch;

if (read(fd, &ch, 1) != 1)

break;

c = ch;

# else

if ((c = getc(f)) == EOF)

break;

# endif /* !AMIGA_AC_5 */

if (c != '\n' && c != '\r')

(*strp)[current++] = c;

if (current == *str_lenp)

extend_input_line();

}

(*strp)[current] = 0;

CLOSE_FILE_OR_PIPE;

/* tack on rest of line to output */

if (rest) {

while (current + rest_len > *str_lenp)

extend_input_line();

strcpy(*strp + current, rest);

free(rest);

}

screen_ok = FALSE;

}

#else /* VMS || PIPES || ATARI && PUREC */

static void

substitute(strp, str_lenp, current)

char **strp;

size_t *str_lenp;

int current;

{

int_error(t_num, "substitution not supported by %s", OS);

}

#endif /* unix || VMS || PIPES || ATARI && PUREC */

gnuplot-old/src/scanner.c at pm3d · gnuplot/gnuplot-old · GitHub

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