SBSPSS/Utils/Parser Generator/SOURCE/yymwork.c

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2000-12-08 21:40:33 +01:00
/************************************************************
yymwork.c
This file can be freely modified for the generation of
custom code.
Copyright (c) 1999 Bumble-Bee Software Ltd.
************************************************************/
#include <string.h>
#include "myacc.h"
#ifdef YYPROTOTYPE
int YYCDECL yymwork(yymparse_t YYFAR *yy)
#else
int YYCDECL yymwork(yy)
yymparse_t YYFAR *yy;
#endif
{
int errorpop = 0;
yyassert(yy != NULL);
yyassert(yymisfastparser(yy)); /* make sure it's a fast parser */
while (1) {
unsigned char type;
short sr;
yystack_t state = yympeek(yy); /* get top state */
while (1) {
if (yy->yymstateaction[state].lookahead) {
int index;
if (!yy->yymlookahead) {
yy->yymlookahead = 1;
yy->yymchar = (*yy->yymgettoken)(yy);
if (yy->yymchar < 0) {
yy->yymchar = 0;
}
#ifdef YYDEBUG
yymdgettoken(yy, yy->yymchar);
#endif
}
index = yy->yymstateaction[state].base + yy->yymchar;
if (index >= 0 && index < yy->yymtokenaction_size) {
if (yy->yymtokenaction[index].check == state) {
type = yy->yymtokenaction[index].type;
sr = yy->yymtokenaction[index].sr;
break; /* escape from loop */
}
}
}
type = yy->yymstateaction[state].type;
sr = yy->yymstateaction[state].sr;
if (type != YYAT_DEFAULT) {
break; /* escape from loop */
}
state = sr;
}
/* action */
switch (type) {
case YYAT_SHIFT:
#ifdef YYDEBUG
yymdshift(yy, yy->yymchar);
#endif
if (yy->yymskip > 0) {
yymsetskip(yy, yy->yymskip - 1);
}
if (!yympush(yy, sr)) {
#ifdef YYDEBUG
yymdabort(yy);
#endif
if (yy->yymwipeflg) {
yymwipe(yy); /* clean up */
}
return 1;
}
memcpy(&((char YYFAR *) yy->yymattributestackptr)[yy->yymtop *
yy->yymattribute_size], yy->yymlvalptr, yy->yymattribute_size);
yy->yymlookahead = 0;
continue; /* go to top of while loop */
case YYAT_REDUCE:
#ifdef YYDEBUG
yymdreduce(yy, sr);
#endif
yy->yymretireflg = 0;
if (yy->yymreduction[sr].action != -1) {
/* user actions in here */
if (yy->yymreduction[sr].length > 0) {
memcpy(yy->yymvalptr, &((char YYFAR *) yy->yymattributestackptr)
[(yy->yymtop + 1 - yy->yymreduction[sr].length) *
yy->yymattribute_size], yy->yymattribute_size);
}
yy->yymerrorflg = 0;
yy->yymexitflg = 0;
(*yy->yymparseaction)(yy, yy->yymreduction[sr].action);
/* check for special user requected actions */
if (yy->yymexitflg) {
#ifdef YYDEBUG
yymdexit(yy, yy->yymexitcode);
#endif
return yy->yymexitcode;
}
if (yy->yymerrorflg) {
errorpop = yy->yymerrorpop;
#ifdef YYDEBUG
yymdthrowerror(yy, yy->yymerrorpop);
#endif
yy->yymerrorcount++;
break; /* go to error handler */
}
}
yympop(yy, yy->yymreduction[sr].length);
{
yystack_t state = yympeek(yy); /* get top state */
short next;
int nonterm = yy->yymreduction[sr].nonterm;
while (1) {
int index = yy->yymstategoto[state].base + nonterm;
if (index >= 0 && index < yy->yymnontermgoto_size) {
if (yy->yymnontermgoto[index].check == state) {
next = yy->yymnontermgoto[index].next;
break;
}
}
next = yy->yymstategoto[state].def;
if (next == -1) {
break;
}
state = next;
}
yyassert(next != -1);
if (!yympush(yy, next)) {
#ifdef YYDEBUG
yymdabort(yy);
#endif
if (yy->yymwipeflg) {
yymwipe(yy); /* clean up */
}
return 1;
}
}
if (yy->yymreduction[sr].action != -1) {
memcpy(&((char YYFAR *) yy->yymattributestackptr)
[yy->yymtop * yy->yymattribute_size],
yy->yymvalptr, yy->yymattribute_size);
}
if (yy->yymretireflg) {
#ifdef YYDEBUG
yymdretire(yy, yy->yymretirecode);
#endif
return yy->yymretirecode;
}
continue; /* go to top of while loop */
case YYAT_ERROR:
#ifdef YYDEBUG
yymdsyntaxerror(yy);
#endif
if (yy->yymskip == 0) {
yy->yymerrorcount++;
(*yy->yymsyntaxerror)(yy);
}
break; /* go to error handler */
default:
yyassert(type == YYAT_ACCEPT);
#ifdef YYDEBUG
yymdaccept(yy);
#endif
return 0;
}
/* error handler */
if (yy->yymskip < 3 || errorpop > 0) {
#ifdef YYDEBUG
yymdattemptrecovery(yy);
#endif
yy->yympopflg = 0; /* clear flag */
while (1) {
state = yympeek(yy); /* get top state */
while (1) {
int index = yy->yymstateaction[state].base + YYTK_ERROR;
if (index >= 0 && index < yy->yymtokenaction_size) {
if (yy->yymtokenaction[index].check == state) {
type = yy->yymtokenaction[index].type;
sr = yy->yymtokenaction[index].sr;
break; /* escape from loop */
}
}
type = yy->yymstateaction[state].type;
sr = yy->yymstateaction[state].sr;
if (type != YYAT_DEFAULT) {
break; /* escape from loop */
}
state = sr;
}
if (type == YYAT_SHIFT) {
if (errorpop <= 0) {
#ifdef YYDEBUG
yymdshift(yy, YYTK_ERROR);
#endif
if (!yympush(yy, sr)) {
#ifdef YYDEBUG
yymdabort(yy);
#endif
if (yy->yymwipeflg) {
yymwipe(yy); /* clean up */
}
return 1;
}
yymsetskip(yy, 3); /* skip 3 erroneous characters */
break;
}
errorpop--;
}
yy->yympopflg = 1;
/* clean up any symbol attributes */
if (yy->yymdestructorptr != NULL) {
int action;
state = yympeek(yy);
action = yy->yymdestructorptr[state];
if (action != -1) {
/* user actions in here */
memcpy(yy->yymvalptr, &((char YYFAR *) yy->yymattributestackptr)
[yy->yymtop * yy->yymattribute_size],
yy->yymattribute_size);
(*yy->yymparseaction)(yy, action);
memcpy(&((char YYFAR *) yy->yymattributestackptr)
[yy->yymtop * yy->yymattribute_size], yy->yymvalptr,
yy->yymattribute_size);
}
}
yympop(yy, 1);
if (yy->yymtop < 0) {
#ifdef YYDEBUG
yymdabort(yy);
#endif
if (yy->yymwipeflg) {
yymwipe(yy); /* clean up */
}
return 1;
}
}
}
else {
if (yy->yymlookahead) {
if (yy->yymchar != 0) {
#ifdef YYDEBUG
yymddiscard(yy, yy->yymchar);
#endif
(*yy->yymdiscard)(yy, yy->yymchar);
/* clean up any token attributes */
if (yy->yymtokendestptr != NULL) {
int index = yy->yymtokendestbase + yy->yymchar;
if (index >= 0 && index < yy->yymtokendest_size) {
int action = yy->yymtokendestptr[index];
if (action != -1) {
/* user actions in here */
memcpy(yy->yymvalptr, yy->yymlvalptr, yy->yymattribute_size);
(*yy->yymparseaction)(yy, action);
memcpy(yy->yymlvalptr, yy->yymvalptr, yy->yymattribute_size);
}
}
}
yy->yymlookahead = 0; /* skip erroneous character */
}
else {
#ifdef YYDEBUG
yymdabort(yy);
#endif
if (yy->yymwipeflg) {
yymwipe(yy); /* clean up */
}
return 1;
}
}
}
}
}