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nextsymb.c
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nextsymb.c
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/*
* $Id: nextsymb.c,v 1.8 2008/07/15 07:40:25 bnv Exp $
* $Log: nextsymb.c,v $
* Revision 1.8 2008/07/15 07:40:25 bnv
* #include changed from <> to ""
*
* Revision 1.7 2004/04/30 15:25:41 bnv
* Spaces...
*
* Revision 1.6 2004/03/27 08:34:21 bnv
* Corrected: Line number was not restored after the comma at the end of the line
*
* Revision 1.5 2003/01/30 08:22:37 bnv
* Corrected: comment after the comma_sy search
*
* Revision 1.4 2002/06/11 12:37:38 bnv
* Added: CDECL
*
* Revision 1.3 2001/06/25 18:51:48 bnv
* Header -> Id
*
* Revision 1.2 1999/11/26 13:13:47 bnv
* Changed: Some spaces to tabs.
*
* Revision 1.1 1998/07/02 17:34:50 bnv
* Initial revision
*
*/
#define __NEXTSYMB_C__
#include <cmssys.h>
#include "lerror.h"
#include "lstring.h"
#include "nextsymb.h"
/* ------------------- function prototypes ----------------------- */
static void literal(void);
static void identifier(int isnumber);
/* --------------------------------------------------------------- */
/* return the next character and advance the input stream by one */
/* also it searches for comments */
/* --------------------------------------------------------------- */
static void
nextchar(int instring) {
int level = 0;
Context *context = (Context *) CMSGetPG();
(context->nextsymb_commentfound) = FALSE;
getnextchar:
if (instring != -1) {
if (*(context->nextsymbsymbolptr) == '\n')
(context->nextsymbsymboline)++;
(context->nextsymbsymbolptr)++;
} else
instring = FALSE;
if (!instring && *(context->nextsymbsymbolptr) == '/' &&
*((context->nextsymbsymbolptr) + 1) == '*') {
/* search for comment */
(context->nextsymb_commentfound) = TRUE;
(context->nextsymbsymbolptr) += 2;
level++;
for (;;) {
while ((*(context->nextsymbsymbolptr) != '*') &&
(*(context->nextsymbsymbolptr) != '/')) {
if (*(context->nextsymbsymbolptr) == '\n')
(context->nextsymbsymboline)++;
(context->nextsymbsymbolptr)++;
if (*(context->nextsymbsymbolptr) == 0)
(context->lstring_Lerror)(ERR_UNMATCHED_QUOTE, 1);
};
(context->nextsymbsymbolptr)++;
if ((*((context->nextsymbsymbolptr) - 1) == '/') &&
(*(context->nextsymbsymbolptr) == '*')) {
level++;
(context->nextsymbsymbolptr)++;
} else if ((*((context->nextsymbsymbolptr) - 1) == '*') &&
(*(context->nextsymbsymbolptr) == '/')) {
--level;
if (!level) goto getnextchar;
(context->nextsymbsymbolptr)++;
}
}
}
} /* nextchar */
/* --------------- InitNextsymbol -------------------- */
void __CDECL
InitNextsymbol(PLstr str) {
Context *context = (Context *) CMSGetPG();
Lcat(str, "\n"); /* We must have a least one new line at the end */
(context->nextsymb_ProgStr) = str;
LASCIIZ(*(context->nextsymb_ProgStr)); /* Put a zero at the end */
(context->nextsymbsymbol) = semicolon_sy;
(context->nextsymbsymbolptr) = LSTR(*(context->nextsymb_ProgStr));
(context->nextsymbsymboline) = 1;
/* Skip first line, '#!/bin/rexx' */
if ((context->nextsymbsymbolptr)[0] == '#' &&
(context->nextsymbsymbolptr)[1] == '!') {
while (*(context->nextsymbsymbolptr) != '\n')
(context->nextsymbsymbolptr)++;
(context->nextsymbsymboline)++;
}
(context->nextsymb_InitNextch) = FALSE;
(context->nextsymb_NextBlank) = FALSE;
(context->nextsymbsymbolstat) = normal_st;
} /* InitNextsymbol */
/* --------------------------------------------------------------- */
/* P A R S E next B A S I C S Y M B O L */
/* Return the next basic (context->nextsymbsymbol) and advance the input stream */
/* --------------------------------------------------------------- */
void __CDECL
nextsymbol(void) {
Context *context = (Context *) CMSGetPG();
#define NEXTCHAR {*(ns++)=*(context->nextsymbsymbolptr); LLEN((context->nextsymbsymbolstr))++; nextchar(FALSE);}
char *Psymbolptr, *ns;
int _lineno;
if (!(context->nextsymb_InitNextch)) {
/* call nextchar to search for comments */
nextchar(-1); /* initialise */
(context->nextsymb_commentfound) = FALSE;
(context->nextsymb_InitNextch) = TRUE;
}
/* make the type always to be LSTRING */
LTYPE((context->nextsymbsymbolstr)) = LSTRING_TY;
LLEN((context->nextsymbsymbolstr)) = 0;
(context->nextsymb__in_nextsymbol) = TRUE;
(context->nextsymbsymbolPrevBlank) = (context->nextsymb_NextBlank);
(context->nextsymb_NextBlank) = FALSE;
_NEXTSYMBOL:
while (*(context->nextsymbsymbolptr) == ' ' ||
*(context->nextsymbsymbolptr) == '\t')
nextchar(FALSE);
ns = LSTR((context->nextsymbsymbolstr));
(context->nextsymbsymbolprevptr) = (context->nextsymbsymbolptr);
switch ((context->lstring_l2u)[(byte) *(context->nextsymbsymbolptr)]) {
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
(context->nextsymbsymbol) = literal_sy;
identifier(TRUE);
break;
case 'A':
case 'B':
case 'C':
case 'D':
case 'E':
case 'F':
case 'G':
case 'H':
case 'I':
case 'J':
case 'K':
case 'L':
case 'M':
case 'N':
case 'O':
case 'P':
case 'Q':
case 'R':
case 'S':
case 'T':
case 'U':
case 'V':
case 'W':
case 'X':
case 'Y':
case 'Z':
case '@':
case '#':
case '$':
case '_':
case '?':
case '!':
(context->nextsymbsymbol) = ident_sy;
identifier(FALSE);
break;
case '/': NEXTCHAR;
if (*(context->nextsymbsymbolptr) == '/') {
(context->nextsymbsymbol) = mod_sy;
NEXTCHAR;
} else if (*(context->nextsymbsymbolptr) == '=') {
NEXTCHAR;
if (*(context->nextsymbsymbolptr) == '=') {
(context->nextsymbsymbol) = dne_sy;
NEXTCHAR;
} else
(context->nextsymbsymbol) = ne_sy;
} else
(context->nextsymbsymbol) = div_sy;
break;
case '-':
(context->nextsymbsymbol) = minus_sy;
NEXTCHAR;
break;
case '*': NEXTCHAR;
if (*(context->nextsymbsymbolptr) == '/')
(context->lstring_Lerror)(ERR_INVALID_EXPRESSION, 0);
if (*(context->nextsymbsymbolptr) == '*') {
(context->nextsymbsymbol) = power_sy;
NEXTCHAR;
} else
(context->nextsymbsymbol) = times_sy;
break;
case '~':
case '^':
case '\\': NEXTCHAR;
switch (*(context->nextsymbsymbolptr)) {
case '=': NEXTCHAR;
if (*(context->nextsymbsymbolptr) == '=') {
(context->nextsymbsymbol) = dne_sy;
NEXTCHAR;
} else
(context->nextsymbsymbol) = ne_sy;
break;
case '>': NEXTCHAR;
if (*(context->nextsymbsymbolptr) == '>') {
(context->nextsymbsymbol) = dle_sy;
NEXTCHAR;
} else
(context->nextsymbsymbol) = le_sy;
break;
case '<': NEXTCHAR;
if (*(context->nextsymbsymbolptr) == '<') {
(context->nextsymbsymbol) = dge_sy;
NEXTCHAR;
} else
(context->nextsymbsymbol) = ge_sy;
break;
default:
(context->nextsymbsymbol) = not_sy;
}
break;
case '%':
(context->nextsymbsymbol) = intdiv_sy;
NEXTCHAR;
break;
case '(':
(context->nextsymbsymbol) = le_parent;
NEXTCHAR;
break;
case ')':
(context->nextsymbsymbol) = ri_parent;
NEXTCHAR;
break;
#ifndef MSDOS
/* Only for UNIX where \r is not recognised as \n */
case '\r': NEXTCHAR;
#endif
case '\n':
case ';':
(context->nextsymbsymbol) = semicolon_sy;
NEXTCHAR;
break;
case ',': NEXTCHAR;
Psymbolptr = (context->nextsymbsymbolptr);
_lineno = (context->nextsymbsymboline);
nextsymbol();
(context->nextsymb_NextBlank) = FALSE;
(context->nextsymbsymbolPrevBlank) = TRUE;
if ((context->nextsymbsymbol) == semicolon_sy &&
_lineno != (context->nextsymbsymboline))
goto _NEXTSYMBOL;
(context->nextsymbsymbolptr) = Psymbolptr;
(context->nextsymbsymboline) = _lineno;
(context->nextsymbsymbol) = comma_sy;
(context->nextsymb_NextBlank) = FALSE;
(context->nextsymbsymbolPrevBlank) = TRUE;
(context->nextsymb_commentfound) = FALSE;
break;
case '.':
Psymbolptr = (context->nextsymbsymbolptr) + 1;
if (*Psymbolptr != ' ' &&
*Psymbolptr != ',' &&
*Psymbolptr != '\n' &&
*Psymbolptr != '\r' &&
*Psymbolptr != '\t' &&
*Psymbolptr != ';') {
(context->nextsymbsymbol) = literal_sy;
identifier(TRUE);
} else {
(context->nextsymbsymbol) = dot_sy;
NEXTCHAR;
}
break;
case '|': NEXTCHAR;
if (*(context->nextsymbsymbolptr) == '|') {
(context->nextsymbsymbol) = concat_sy;
NEXTCHAR;
} else
(context->nextsymbsymbol) = or_sy;
break;
case '&': NEXTCHAR;
if (*(context->nextsymbsymbolptr) == '&') {
(context->nextsymbsymbol) = xor_sy;
NEXTCHAR;
} else
(context->nextsymbsymbol) = and_sy;
break;
case '+':
(context->nextsymbsymbol) = plus_sy;
NEXTCHAR;
break;
case '=': NEXTCHAR;
switch (*(context->nextsymbsymbolptr)) {
case '=': NEXTCHAR;
(context->nextsymbsymbol) = deq_sy;
break;
case '>': NEXTCHAR;
if (*(context->nextsymbsymbolptr) == '>') {
NEXTCHAR;
(context->nextsymbsymbol) = dge_sy;
} else
(context->nextsymbsymbol) = ge_sy;
break;
case '<': NEXTCHAR;
if (*(context->nextsymbsymbolptr) == '<') {
NEXTCHAR;
(context->nextsymbsymbol) = dle_sy;
} else
(context->nextsymbsymbol) = le_sy;
break;
default:
(context->nextsymbsymbol) = eq_sy;
}
break;
case '<': NEXTCHAR;
switch (*(context->nextsymbsymbolptr)) {
case '<': NEXTCHAR;
if (*(context->nextsymbsymbolptr) == '=') {
(context->nextsymbsymbol) = dle_sy;
NEXTCHAR;
} else
(context->nextsymbsymbol) = dlt_sy;
break;
case '=':
(context->nextsymbsymbol) = le_sy;
NEXTCHAR;
break;
case '>':
(context->nextsymbsymbol) = ne_sy;
NEXTCHAR;
break;
default:
(context->nextsymbsymbol) = lt_sy;
}
break;
case '>': NEXTCHAR;
switch (*(context->nextsymbsymbolptr)) {
case '>': NEXTCHAR;
if (*(context->nextsymbsymbolptr) == '=') {
(context->nextsymbsymbol) = dge_sy;
NEXTCHAR;
} else
(context->nextsymbsymbol) = dgt_sy;
break;
case '=':
(context->nextsymbsymbol) = ge_sy;
NEXTCHAR;
break;
case '<':
(context->nextsymbsymbol) = ne_sy;
NEXTCHAR;
break;
default:
(context->nextsymbsymbol) = gt_sy;
}
break;
case '\'':
case '\"':
literal();
break;
case ':':
(context->lstring_Lerror)(ERR_SYMBOL_EXPECTED, 0);
break;
case 0:
(context->nextsymb__in_nextsymbol) = FALSE;
if (((context->nextsymbsymbolstat) == in_do_st) ||
((context->nextsymbsymbolstat) == in_if_st))
(context->lstring_Lerror)(ERR_INCOMPLETE_STRUCT, 0);
else if ((context->nextsymbsymbolstat) == in_if_init_st)
(context->lstring_Lerror)(ERR_THEN_EXPECTED, 0);
else if ((context->nextsymbsymbolstat) != normal_st)
(context->lstring_Lerror)(ERR_SYMBOL_EXPECTED, 0);
(context->nextsymbsymbol) = exit_sy;
(context->nextsymbsymboline)--; /* Seems to add a line number ... */
break;
default:
(context->lstring_Lerror)(ERR_INVALID_CHAR, 0);
}
if (*(context->nextsymbsymbolptr) == ' ' ||
*(context->nextsymbsymbolptr) == '\t' ||
*(context->nextsymbsymbolptr) == ',')
(context->nextsymb_NextBlank) = TRUE;
(context->nextsymb__in_nextsymbol) = FALSE;
} /* nextsymbol */
/* --------------------------------------------------------------- */
/* find the identifier */
/* --------------------------------------------------------------- */
static void
identifier(int isnumber) {
char *s;
int l; /* length */ /* -+- l > maxlen ? */
int hasDot = FALSE, hasExp = FALSE;
Context *context = (Context *) CMSGetPG();
(context->nextsymbsymbolisstr) = FALSE;
(context->nextsymbsymbolhasdot) = 0;
s = LSTR((context->nextsymbsymbolstr));
l = 0;
for (;;) {
if (l > LMAXLEN((context->nextsymbsymbolstr)))
(context->lstring_Lerror)(ERR_TOO_LONG_STRING, 0);
if ((context->nextsymb_commentfound) &&
*(context->nextsymbsymbolptr) != '(' &&
*(context->nextsymbsymbolptr) != ':') {
(context->nextsymb_commentfound) = FALSE;
*s = '\0';
LLEN((context->nextsymbsymbolstr)) = l;
goto Nleave;
}
switch ((context->lstring_l2u)[(byte) *(context->nextsymbsymbolptr)]) {
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
*s++ = *(context->nextsymbsymbolptr);
l++;
nextchar(FALSE);
break;
case 'A':
case 'B':
case 'C':
case 'D':
case 'E':
case 'F':
case 'G':
case 'H':
case 'I':
case 'J':
case 'K':
case 'L':
case 'M':
case 'N':
case 'O':
case 'P':
case 'Q':
case 'R':
case 'S':
case 'T':
case 'U':
case 'V':
case 'W':
case 'X':
case 'Y':
case 'Z':
case '@':
case '#':
case '$':
case '_':
case '?':
case '!':
*s = (context->lstring_l2u)[(byte) *(context
->nextsymbsymbolptr)];
if (isnumber) {
if (*s == 'E') {
if (hasExp)
isnumber = FALSE;
hasExp = TRUE;
} else
isnumber = FALSE;
}
s++;
l++;
nextchar(FALSE);
break;
case '+':
case '-':
if (isnumber) {
if (*(s - 1) == 'E') {
*s++ = *(context->nextsymbsymbolptr);
l++;
nextchar(FALSE);
} else {
*s = '\0';
LLEN((context->nextsymbsymbolstr)) = l;
goto Nleave;
}
} else {
*s = '\0';
LLEN((context->nextsymbsymbolstr)) = l;
goto Nleave;
}
break;
case '.':
*s++ = *(context->nextsymbsymbolptr);
l++;
if (!(context->nextsymbsymbolhasdot)) /* position of first */
(context->nextsymbsymbolhasdot) = l; /* dot */
nextchar(FALSE);
if (isnumber) {
if (hasDot)
isnumber = FALSE;
hasDot = TRUE;
(context->nextsymbsymbolhasdot) = 0;
}
break;
case '(':
nextchar(FALSE);
*s = '\0';
LLEN((context->nextsymbsymbolstr)) = l;
(context->nextsymbsymbol) = function_sy;
return;
case ':':
nextchar(FALSE);
*s = '\0';
LLEN((context->nextsymbsymbolstr)) = l;
(context->nextsymbsymbol) = label_sy;
return;
case '\t':
case ' ':
(context->nextsymb_NextBlank) = TRUE;
*s = '\0';
LLEN((context->nextsymbsymbolstr)) = l;
while (*(context->nextsymbsymbolptr) == ' ' ||
*(context->nextsymbsymbolptr) == '\t')
nextchar(FALSE);
/* literal finished and it is not a label? */
if (*(context->nextsymbsymbolptr) != ':')
goto Nleave;
/* literal is label */
(context->nextsymbsymbol) = label_sy;
nextchar(FALSE);
return;
default:
*s = '\0';
LLEN((context->nextsymbsymbolstr)) = l;
goto Nleave;
} /* end of switch */
} /* end of for */
Nleave:
if ((context->nextsymbsymbol) != ident_sy) return;
if ((context->nextsymbsymbolhasdot) == LLEN((context->nextsymbsymbolstr)))
(context->nextsymbsymbolhasdot) = 0; /* treat is as a variable */
if ((context->nextsymbsymbolstat) == in_do_init_st) {
if (!Lcmp(&(context->nextsymbsymbolstr), "BY"))
(context->nextsymbsymbol) = by_sy;
else if (!Lcmp(&(context->nextsymbsymbolstr), "FOR"))
(context->nextsymbsymbol) = for_sy;
else if (!Lcmp(&(context->nextsymbsymbolstr), "TO"))
(context->nextsymbsymbol) = to_sy;
else if (!Lcmp(&(context->nextsymbsymbolstr), "UNTIL"))
(context->nextsymbsymbol) = until_sy;
else if (!Lcmp(&(context->nextsymbsymbolstr), "WHILE"))
(context->nextsymbsymbol) = while_sy;
} else if ((context->nextsymbsymbolstat) == in_parse_value_st) {
if (!Lcmp(&(context->nextsymbsymbolstr), "WITH"))
(context->nextsymbsymbol) = with_sy;
} else if ((context->nextsymbsymbolstat) == in_if_init_st) {
if (!Lcmp(&(context->nextsymbsymbolstr), "THEN"))
(context->nextsymbsymbol) = then_sy;
}
} /* identifier */
/* --------------------------------------------------------------- */
/* extract a literal (context->nextsymbsymbol) */
/* --------------------------------------------------------------- */
static void
literal(void) {
char quote;
char *s;
int l; /* length of (context->nextsymbsymbolstr) */
Lstr A;
Context *context = (Context *) CMSGetPG();
(context->nextsymbsymbolhasdot) = 0;
(context->nextsymbsymbol) = literal_sy;
quote = *(context->nextsymbsymbolptr);
s = LSTR((context->nextsymbsymbolstr));
l = 0;
(context->nextsymbsymbolisstr) = TRUE;
for (;;) { /* -+- l > maxlen ? */
nextchar(TRUE);
if (l >= LMAXLEN((context->nextsymbsymbolstr)))
(context->lstring_Lerror)(ERR_TOO_LONG_STRING, 0);
if (*(context->nextsymbsymbolptr) == quote) {
nextchar(FALSE); /* quote ended?? */
if (*(context->nextsymbsymbolptr) == '(') {
*s = '\0';
LLEN((context->nextsymbsymbolstr)) = l;
(context->nextsymbsymbol) = function_sy;
nextchar(FALSE);
return;
} else if ((context
->nextsymb_commentfound)) { /* a comment was inside */
(context->nextsymb_commentfound) = FALSE;
*s = '\0';
LLEN((context->nextsymbsymbolstr)) = l;
return;
} else if (STRCHR("bBxXhH", *(context->nextsymbsymbolptr))) {
/* check next char */
char nc = (context->lstring_l2u)[(byte) *(
(context->nextsymbsymbolptr) + 1)];
*s = '\0';
LLEN((context->nextsymbsymbolstr)) = l;
if (IN_RANGE('0', nc, '9') ||
IN_RANGE('A', nc, 'Z') ||
nc == '@' || nc == '#' || nc == '$' ||
nc == '_' || nc == '?' || nc == '!' ||
nc == '.')
return;
LINITSTR(A);
switch ((context->lstring_l2u)[(byte) *(context
->nextsymbsymbolptr)]) {
case 'B':
if (!Ldatatype(&(context->nextsymbsymbolstr), 'B'))
(context->lstring_Lerror)(ERR_INVALID_HEX_CONST, 0);
Lb2x(&A, &(context->nextsymbsymbolstr));
Lx2c(&(context->nextsymbsymbolstr), &A);
break;
case 'H':
if (!Ldatatype(&(context->nextsymbsymbolstr), 'X'))
(context->lstring_Lerror)(ERR_INVALID_HEX_CONST, 0);
Lx2d(&A, &(context->nextsymbsymbolstr), 0);
Lstrcpy(&(context->nextsymbsymbolstr), &A);
break;
case 'X':
if (!Ldatatype(&(context->nextsymbsymbolstr), 'X'))
(context->lstring_Lerror)(ERR_INVALID_HEX_CONST, 0);
Lx2c(&A, &(context->nextsymbsymbolstr));
Lstrcpy(&(context->nextsymbsymbolstr), &A);
break;
}
nextchar(FALSE);
LFREESTR(A);
return;
} else if (*(context->nextsymbsymbolptr) == quote) {
*s++ = *(context->nextsymbsymbolptr);
l++;
} else {
*s = '\0';
LLEN((context->nextsymbsymbolstr)) = l;
return;
}
} else if (*(context->nextsymbsymbolptr) == '\n') {
*s++ = ' ';
l++;
} else if (*(context->nextsymbsymbolptr) == 0)
(context->lstring_Lerror)(ERR_UNMATCHED_QUOTE,
(quote == '\'') ? 2 : 3);
else {
*s++ = *(context->nextsymbsymbolptr);
l++;
}
}
} /* literal */