# Java skeleton for Bison -*- autoconf -*-
-# Copyright (C) 2007, 2008, 2009 Free Software Foundation, Inc.
+# Copyright (C) 2007-2012 Free Software Foundation, Inc.
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
m4_divert_push(0)dnl
@output(b4_parser_file_name@)@
b4_copyright([Skeleton implementation for Bison LALR(1) parsers in Java],
- [2007, 2008, 2009])
+ [2007-2012])
b4_percent_define_ifdef([package], [package b4_percent_define_get([package]);
])[/* First part of user declarations. */
private ]b4_location_type[ yylloc (YYStack rhs, int n)
{
if (n > 0)
- return new ]b4_location_type[ (rhs.locationAt (1).begin, rhs.locationAt (n).end);
+ return new ]b4_location_type[ (rhs.locationAt (n-1).begin, rhs.locationAt (0).end);
else
return new ]b4_location_type[ (rhs.locationAt (0).end);
}]])[
}
public final void pop () {
- height--;
+ pop (1);
}
public final void pop (int num) {
// Avoid memory leaks... garbage collection is a white lie!
if (num > 0) {
- java.util.Arrays.fill (valueStack, height - num + 1, height, null);
- ]b4_locations_if([[java.util.Arrays.fill (locStack, height - num + 1, height, null);]])[
+ java.util.Arrays.fill (valueStack, height - num + 1, height + 1, null);
+ ]b4_locations_if([[java.util.Arrays.fill (locStack, height - num + 1, height + 1, null);]])[
}
height -= num;
}
{
out.print ("Stack now");
- for (int i = 0; i < height; i++)
+ for (int i = 0; i <= height; i++)
{
out.print (' ');
out.print (stateStack[i]);
* printing an error message. */
public static final int YYERROR = 2;
- /**
- * Returned by a Bison action in order to print an error message and start
- * error recovery. */
- public static final int YYFAIL = 3;
-
+ // Internal return codes that are not supported for user semantic
+ // actions.
+ private static final int YYERRLAB = 3;
private static final int YYNEWSTATE = 4;
private static final int YYDEFAULT = 5;
private static final int YYREDUCE = 6;
/// Semantic value of the lookahead.
b4_yystype[ yylval = null;
- int yyresult;
-
yycdebug ("Starting parse\n");
yyerrstatus_ = 0;
]m4_ifdef([b4_initial_action], [
-m4_pushdef([b4_at_dollar], [yylloc])dnl
-m4_pushdef([b4_dollar_dollar], [yylval])dnl
- /* User initialization code. */
- b4_user_initial_action
-m4_popdef([b4_dollar_dollar])dnl
-m4_popdef([b4_at_dollar])])dnl
+b4_dollar_pushdef([yylval], [], [yylloc])dnl
+/* User initialization code. */
+b4_user_initial_action
+b4_dollar_popdef])[]dnl
[ /* Initialize the stack. */
yystack.push (yystate, yylval]b4_locations_if([, yylloc])[);
else if ((yyn = yytable_[yyn]) <= 0)
{
if (yy_table_value_is_error_ (yyn))
- label = YYFAIL;
+ label = YYERRLAB;
else
{
yyn = -yyn;
case YYDEFAULT:
yyn = yydefact_[yystate];
if (yyn == 0)
- label = YYFAIL;
+ label = YYERRLAB;
else
label = YYREDUCE;
break;
/*------------------------------------.
| yyerrlab -- here on detecting error |
`------------------------------------*/
- case YYFAIL:
+ case YYERRLAB:
/* If not already recovering from an error, report this error. */
if (yyerrstatus_ == 0)
{
- ++yynerrs_;
- yyerror (]b4_locations_if([yylloc, ])[yysyntax_error (yystate, yytoken));
+ ++yynerrs_;
+ if (yychar == yyempty_)
+ yytoken = yyempty_;
+ yyerror (]b4_locations_if([yylloc, ])[yysyntax_error (yystate, yytoken));
}
]b4_locations_if([yyerrloc = yylloc;])[
}
/* Pop the current state because it cannot handle the error token. */
- if (yystack.height == 1)
+ if (yystack.height == 0)
return false;
]b4_locations_if([yyerrloc = yystack.locationAt (0);])[
{
if (errorVerbose)
{
- int yyn = yypact_[yystate];
- if (yypact_ninf_ < yyn && yyn <= yylast_)
+ /* There are many possibilities here to consider:
+ - Assume YYFAIL is not used. It's too flawed to consider.
+ See
+ <http://lists.gnu.org/archive/html/bison-patches/2009-12/msg00024.html>
+ for details. YYERROR is fine as it does not invoke this
+ function.
+ - If this state is a consistent state with a default action,
+ then the only way this function was invoked is if the
+ default action is an error action. In that case, don't
+ check for expected tokens because there are none.
+ - The only way there can be no lookahead present (in tok) is
+ if this state is a consistent state with a default action.
+ Thus, detecting the absence of a lookahead is sufficient to
+ determine that there is no unexpected or expected token to
+ report. In that case, just report a simple "syntax error".
+ - Don't assume there isn't a lookahead just because this
+ state is a consistent state with a default action. There
+ might have been a previous inconsistent state, consistent
+ state with a non-default action, or user semantic action
+ that manipulated yychar. (However, yychar is currently out
+ of scope during semantic actions.)
+ - Of course, the expected token list depends on states to
+ have correct lookahead information, and it depends on the
+ parser not to perform extra reductions after fetching a
+ lookahead from the scanner and before detecting a syntax
+ error. Thus, state merging (from LALR or IELR) and default
+ reductions corrupt the expected token list. However, the
+ list is correct for canonical LR with one exception: it
+ will still contain any token that will not be accepted due
+ to an error action in a later state.
+ */
+ if (tok != yyempty_)
{
- StringBuffer res;
-
- /* Start YYX at -YYN if negative to avoid negative indexes in
- YYCHECK. In other words, skip the first -YYN actions for this
- state because they are default actions. */
- int yyxbegin = yyn < 0 ? -yyn : 0;
-
- /* Stay within bounds of both yycheck and yytname. */
- int yychecklim = yylast_ - yyn + 1;
- int yyxend = yychecklim < yyntokens_ ? yychecklim : yyntokens_;
- int count = 0;
- for (int x = yyxbegin; x < yyxend; ++x)
- if (yycheck_[x + yyn] == x && x != yyterror_
- && !yy_table_value_is_error_ (yytable_[x + yyn]))
- ++count;
-
- // FIXME: This method of building the message is not compatible
- // with internationalization.
- res = new StringBuffer ("syntax error, unexpected ");
- res.append (yytnamerr_ (yytname_[tok]));
- if (count < 5)
- {
- count = 0;
- for (int x = yyxbegin; x < yyxend; ++x)
- if (yycheck_[x + yyn] == x && x != yyterror_
- && !yy_table_value_is_error_ (yytable_[x + yyn]))
- {
- res.append (count++ == 0 ? ", expecting " : " or ");
- res.append (yytnamerr_ (yytname_[x]));
- }
- }
- return res.toString ();
+ // FIXME: This method of building the message is not compatible
+ // with internationalization.
+ StringBuffer res =
+ new StringBuffer ("syntax error, unexpected ");
+ res.append (yytnamerr_ (yytname_[tok]));
+ int yyn = yypact_[yystate];
+ if (!yy_pact_value_is_default_ (yyn))
+ {
+ /* Start YYX at -YYN if negative to avoid negative
+ indexes in YYCHECK. In other words, skip the first
+ -YYN actions for this state because they are default
+ actions. */
+ int yyxbegin = yyn < 0 ? -yyn : 0;
+ /* Stay within bounds of both yycheck and yytname. */
+ int yychecklim = yylast_ - yyn + 1;
+ int yyxend = yychecklim < yyntokens_ ? yychecklim : yyntokens_;
+ int count = 0;
+ for (int x = yyxbegin; x < yyxend; ++x)
+ if (yycheck_[x + yyn] == x && x != yyterror_
+ && !yy_table_value_is_error_ (yytable_[x + yyn]))
+ ++count;
+ if (count < 5)
+ {
+ count = 0;
+ for (int x = yyxbegin; x < yyxend; ++x)
+ if (yycheck_[x + yyn] == x && x != yyterror_
+ && !yy_table_value_is_error_ (yytable_[x + yyn]))
+ {
+ res.append (count++ == 0 ? ", expecting " : " or ");
+ res.append (yytnamerr_ (yytname_[x]));
+ }
+ }
+ }
+ return res.toString ();
}
}
projects / bison.git / blobdiff