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all: don't emit an error message when the scanner returns YYERRCODE

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I'm quite pleased to see that the tricky case of glr.c was already
prepared by the changes to support syntax_error exceptions.  Better
yet, it is actually syntax_error that becomes a special case of the
general pattern: make yytoken be YYERRCODE.

* data/skeletons/glr.c (YYFAULTYTOK): Remove the now useless (Basil)
Faulty token.
Instead, use the error token.
* data/skeletons/lalr1.d, data/skeletons/lalr1.java: When computing
the action, first check the case of the error token.

* tests/calc.at: Check cases for the error token symbols before and
after it.
This commit is contained in:
Akim Demaille
2020-04-26 14:48:59 +02:00
parent 58e79539fc
commit b254b36db8
6 changed files with 121 additions and 76 deletions
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28
data/skeletons/glr.c
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@@ -334,10 +334,7 @@ static YYLTYPE yyloc_default][]b4_yyloc_default;])[
#define YYMAXLEFT ]b4_max_left_semantic_context[
/* YYMAXUTOK -- Last valid token number (for yychar). */
#define YYMAXUTOK ]b4_user_token_number_max[]b4_glr_cc_if([[
/* YYFAULTYTOK -- Token number (for yychar) that denotes a
syntax_error thrown from the scanner. */
#define YYFAULTYTOK (YYMAXUTOK + 1)]])[
#define YYMAXUTOK ]b4_user_token_number_max[
/* YYTRANSLATE(TOKEN-NUM) -- Symbol number corresponding to TOKEN-NUM
as returned by yylex, with out-of-bounds checking. */
@@ -830,7 +827,7 @@ yygetToken (int *yycharp][]b4_pure_if([, yyGLRStack* yystackp])[]b4_user_formals
// Map errors caught in the scanner to the undefined token,
// so that error handling is started. However, record this
// with this special value of yychar.
*yycharp = YYFAULTYTOK;
*yycharp = ]b4_symbol(1, id)[;
}
#endif // YY_EXCEPTIONS]], [[
*yycharp = ]b4_lex[;]])[
@@ -1035,8 +1032,14 @@ static inline int
yygetLRActions (yy_state_t yystate, yysymbol_kind_t yytoken, const short** yyconflicts)
{
int yyindex = yypact[yystate] + yytoken;
if (yyisDefaultedState (yystate)
|| yyindex < 0 || YYLAST < yyindex || yycheck[yyindex] != yytoken)
if (yytoken == ]b4_symbol(1, kind)[)
{
// This is the error token.
*yyconflicts = yyconfl;
return 0;
}
else if (yyisDefaultedState (yystate)
|| yyindex < 0 || YYLAST < yyindex || yycheck[yyindex] != yytoken)
{
*yyconflicts = yyconfl;
return -yydefact[yystate];
@@ -2486,12 +2489,11 @@ b4_dollar_popdef])[]dnl
}
else if (yyisErrorAction (yyaction))
{]b4_locations_if([[
yystack.yyerror_range[1].yystate.yyloc = yylloc;]])[]b4_glr_cc_if([[
/* Don't issue an error message again for exceptions
thrown from the scanner. */
if (yychar != YYFAULTYTOK)
]], [[
]])[ yyreportSyntaxError (&yystack]b4_user_args[);
yystack.yyerror_range[1].yystate.yyloc = yylloc;]])[
/* Issue an error message unless the scanner already
did. */
if (yychar != ]b4_symbol(1, id)[)
yyreportSyntaxError (&yystack]b4_user_args[);
goto yyuser_error;
}
else