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/* $Id: yyerror.c,v 4.9 2010/07/14 09:57:46 tom Exp $
*
* This file is included into grammar.y to provide the 'yyerror()' function.
* If the yacc/bison parser is one that we know how to backtrack, we'll augment
* the "syntax error" message with information that shows what type of token we
* expected.
*/
#ifndef UCH
#define UCH(c) ((unsigned char)(c))
#endif
/* 'yyerror()' has to be a macro, since it must be expanded inline to subvert
* the internal state of 'yyparse()'.
*/
#if BISON_HAS_YYTNAME /* bison 1.22 */
#if !defined(YYFLAG)
#define YYFLAG YYPACT_NINF /* yabb (yet-another-bison-bug) */
#endif
#if YYDEBUG
/* this is better than defining YYERROR_VERBOSE */
#define yyerror(text) {\
register int n, c1, count = 0;\
yaccError(text);\
if (yypact[yystate] != YYFLAG) { \
for (c1 = 0; c1 < YYLAST; c1++) {\
n = yypact[yystate] + c1;\
if (n >= 0 && n < YYLAST\
&& yycheck[n] == c1 && yytname[c1] != 0)\
yaccExpected(yytname[c1], count++);\
}\
}\
yaccExpected("", -1);\
}
#endif
#endif /* BISON_HAS_YYTNAME */
#if YACC_HAS_YYTOKS_2
#undef YACC_HAS_YYTOKS
#define YACC_HAS_YYTOKS 1
#define YaccState yy_state
#endif
#if YACC_HAS_YYTOKS /* Solaris, Gould */
#if YYDEBUG
#ifndef YaccState
#define YaccState yystate /* sometimes 'yy_state' */
#endif
#define yyerror(text) {\
register int n, x, c1, y, count = 0;\
yaccError(text);\
if (((n = yypact[YaccState]) > YYFLAG) && (n < YYLAST)) {\
for (x = ((n > 0) ? n : 0); x < YYLAST; ++x) {\
c1 = x - n;\
if ((yychk[yyact[x]] == c1) && (c1 != YYERRCODE)) {\
if (isascii(UCH(c1))) {\
static char tmp[] = "'%'";\
tmp[1] = c1;\
yaccExpected(tmp, count++);\
} else {\
for (y = 0; yytoks[y].t_val >= 0; y++) {\
if (yytoks[y].t_val == c1) {\
yaccExpected(yytoks[y].t_name, count++);\
break;\
}\
}\
}\
}\
}\
}\
yaccExpected("", -1);\
}
#endif
#endif /* YACC_HAS_YYTOKS */
#if YACC_HAS_YYNAME /* Linux's yacc */
#if YYDEBUG
#define yyerror(text) {\
register int n, x, c1, count = 0;\
yaccError(text);\
if (((n = yysindex[yystate]) != 0) && (n < YYTABLESIZE)) {\
for (x = ((n > 0) ? n : 0); x < YYTABLESIZE; ++x) {\
c1 = x - n;\
if ((yycheck[x] == c1) && (c1 != YYERRCODE)) {\
yaccExpected(yyname[c1] ? yyname[c1] : "illegal symbol",\
count++);\
}\
}\
}\
yaccExpected("", -1);\
}
#endif
#endif /* YACC_HAS_YYNAME */
/*
* Any way we define it, 'yyerror()' is a real function (that we provide,
* rather than use the one from a library).
*/
static void yaccError(const char *);
#ifdef yyerror
static int
compar(const void *p1, const void *p2)
{
const char *a = *(const char *const *) p1;
const char *b = *(const char *const *) p2;
return strcmp(a, b);
}
#define MSGLEN 80
static void
yaccExpected(const char *s, int count)
{
static struct {
const char *actual, *name;
} tbl[] = {
{
"...", "T_ELLIPSIS"
},
{
"[]", "T_BRACKETS"
},
{
"{", "T_LBRACE"
},
{
"}", "T_MATCHRBRACE"
},
};
unsigned j;
int k, x;
unsigned n;
const char *t = s;
char *tt;
const char *tag;
char tmp[MSGLEN];
static unsigned have;
static unsigned used;
static char **vec;
if (count < 0) {
if (used != 0) {
if (used > 1)
qsort((char *) vec, used, sizeof(vec[0]), compar);
/* limit length of error message */
k = MSGLEN - (int) (strlen(vec[used - 1]) + 2);
for (j = 0; j < used; j++) {
tag = j ? " " : "Expected: ";
s = vec[j];
if (j != (used - 1)) {
x = (int) (strlen(s) + strlen(tag));
if (k <= 0)
continue;
else if ((k - x) <= 0)
s = "...";
k -= x;
}
fprintf(stderr, "%s%s", tag, s);
}
fprintf(stderr, "\n");
while (used-- != 0) {
free(vec[used]);
vec[used] = 0;
}
}
used = 0;
} else {
int found = FALSE;
strcpy(tmp, t);
if (!strncmp(t, "T_", 2)) {
for (j = 0; j < sizeof(tbl) / sizeof(tbl[0]); j++) {
if (!strcmp(t, tbl[j].name)) {
t = tbl[j].actual;
found = TRUE;
break;
}
}
if (!found) {
tt = strncpy(tmp, t + 2, sizeof(tmp) - 1);
for (k = 0; tt[k] != '\0'; k++) {
if (tt[k] == '_')
tt[k] = '-';
else if (isalpha(UCH(tt[k])) && isupper(UCH(tt[k])))
tt[k] = (char) tolower(UCH(tt[k]));
}
}
}
if ((unsigned) count >= have) {
have = (unsigned) (count + 10);
if (vec == 0) {
vec = (char **) malloc(have * sizeof(*vec));
} else {
vec = (char **) realloc(vec, have * sizeof(*vec));
}
for (n = used; n < have; n++)
vec[n] = 0;
}
if (vec[count] != 0) {
free(vec[count]);
}
vec[count] = xstrdup(found ? t : tmp);
used = (unsigned) (count + 1);
}
}
#else
#define yyerror(s) yaccError(s)
#endif /* yyerror */
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