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* data/yacc.c, data/glr.c, data/lal1.cc: Use similar code to

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generate verbose error messages.
Use the number of tokens as an upper bound in yytname, as it
cannot be a non terminal.
This commit is contained in:
Akim Demaille
2003-03-02 13:39:44 +00:00
parent d5286af19b
commit c47495657b
4 changed files with 37 additions and 28 deletions
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21
data/glr.c
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@@ -613,14 +613,14 @@ yytokenName (yySymbol yytoken)
/** Fill in YYVSP[YYLOW1 .. YYLOW0-1] from the chain of states starting
* at YYVSP[YYLOW0].yystate.yypred. Leaves YYVSP[YYLOW1].yystate.yypred
* containing the pointer to the next state in the chain. Assumes
* containing the pointer to the next state in the chain. Assumes
* YYLOW1 < YYLOW0. For convenience, returns YYLOW1. */
static int
yyfill (yyGLRStackItem* yyvsp, int yylow0, int yylow1)
yyfill (yyGLRStackItem* yyvsp, int yylow0, int yylow1)
{
yyGLRState* s;
int i;
s = yyvsp[yylow0].yystate.yypred;
s = yyvsp[yylow0].yystate.yypred;
for (i = yylow0-1; i >= yylow1; i -= 1)
{
if (! s->yyresolved)
@@ -1022,7 +1022,7 @@ yyglrShift (yyGLRStack* yystack, int yyk, yyStateNum yylrState, size_t yyposn,
}
/** Shift stack #K of YYSTACK, to a new state corresponding to LR
* state YYLRSTATE, at input position YYPOSN, with the (unresolved)
* state YYLRSTATE, at input position YYPOSN, with the (unresolved)
* semantic value of YYRHS under the action for YYRULE. */
static inline void
yyglrShiftDefer (yyGLRStack* yystack, int yyk, yyStateNum yylrState,
@@ -1597,29 +1597,28 @@ yyreportSyntaxError (yyGLRStack* yystack,
#if YYERROR_VERBOSE
yySymbol* const yytokenp = yystack->yytokenp;
int yyn;
const char* yyprefix;
yyn = yypact[yystack->yytops.yystates[0]->yylrState];
if (YYPACT_NINF < yyn && yyn < YYLAST)
{
size_t yysize = 0;
const char* yyprefix;
char* yymsg;
int yyx;
/* Start YYX at -YYN if negative to avoid negative indexes in
YYCHECK. */
int yyxbase = yyn < 0 ? -yyn : 0;
int yyxbegin = yyn < 0 ? -yyn : 0;
/* Stay within bounds of both yycheck and yytname. */
int yychecklim = YYLAST - yyn;
int yynsyms = sizeof (yytname) / sizeof (yytname[0]);
int yyxlim = yychecklim < yynsyms ? yychecklim : yynsyms;
int yyxend = yychecklim < YYNTOKENS ? yychecklim : YYNTOKENS;
int yycount = 0;
yyprefix = ", expecting ";
for (yyx = yyxbase; yyx < yyxlim && yycount < 5; yyx += 1)
for (yyx = yyxbegin; yyx < yyxend; ++yyx)
if (yycheck[yyx + yyn] == yyx && yyx != YYTERROR)
{
yysize += strlen (yytokenName (yyx)) + strlen (yyprefix);
yysize += strlen (yyprefix) + strlen (yytokenName (yyx));
yycount += 1;
if (yycount == 5)
{
@@ -1640,7 +1639,7 @@ yyreportSyntaxError (yyGLRStack* yystack,
if (yycount < 5)
{
yyprefix = ", expecting ";
for (yyx = yyxbase; yyx < yyxlim; yyx += 1)
for (yyx = yyxbegin; yyx < yyxend; ++yyx)
if (yycheck[yyx + yyn] == yyx && yyx != YYTERROR)
{
sprintf (yyp, "%s%s", yyprefix, yytokenName (yyx));