# C++ skeleton for Bison
-# Copyright (C) 2002-2010 Free Software Foundation, Inc.
+# Copyright (C) 2002-2011 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_pushdef([b4_copyright_years],
- [2002-2010])
+ [2002-2011])
m4_define([b4_parser_class_name],
[b4_percent_define_get([[parser_class_name]])])
b4_defines_if([],
[b4_fatal([b4_skeleton[: using %%defines is mandatory]])])
-b4_locations_if(
-[# Backward compatibility.
-m4_define([b4_location_constructors])
-m4_include(b4_pkgdatadir/[location.cc])])
+b4_locations_if([b4_percent_define_ifdef([[location_type]], [],
+ [# Backward compatibility.
+ m4_define([b4_location_constructors])
+ m4_include(b4_pkgdatadir/[location.cc])])])
m4_include(b4_pkgdatadir/[stack.hh])
b4_variant_if([m4_include(b4_pkgdatadir/[variant.hh])])
#include <stdexcept>
#include <string>
#include <iostream>
-]b4_locations_if([#include "location.hh"])[
#include "stack.hh"
+]b4_locations_if([b4_percent_define_ifdef([[location_type]], [],
+ [[#include "location.hh"]])])[
-]b4_namespace_open[
-]b4_variant_if([b4_variant_define])[
-]b4_namespace_close[
+]b4_variant_if([b4_namespace_open
+b4_variant_define
+b4_namespace_close])[
/* Enabling traces. */
#ifndef YYDEBUG
# define YYTOKEN_TABLE ]b4_token_table[
#endif
-]b4_locations_if([dnl
-[/* YYLLOC_DEFAULT -- Set CURRENT to span from RHS[1] to RHS[N].
- If N is 0, then set CURRENT to the empty location which ends
- the previous symbol: RHS[0] (always defined). */
-
-#ifndef YYLLOC_DEFAULT
-# define YYLLOC_DEFAULT(Current, Rhs, N) \
-do { \
- if (N) \
- { \
- (Current).begin = (Rhs)[1].location.begin; \
- (Current).end = (Rhs)[N].location.end; \
- } \
- else \
- { \
- (Current).begin = (Current).end = (Rhs)[0].location.end; \
- } \
-} while (false)
-#endif]])[
-
]b4_namespace_open[
/// A Bison parser.
yyfinal_ = ]b4_final_state_number[, //< Termination state number.
yyterror_ = 1,
yyerrcode_ = 256,
- yyntokens_ = ]b4_tokens_number[, //< Number of tokens.
+ yyntokens_ = ]b4_tokens_number[ //< Number of tokens.
};
]b4_parse_param_vars[
# endif
#endif
+]b4_locations_if([dnl
+[/* YYLLOC_DEFAULT -- Set CURRENT to span from RHS[1] to RHS[N].
+ If N is 0, then set CURRENT to the empty location which ends
+ the previous symbol: RHS[0] (always defined). */
+
+#define YYRHSLOC(Rhs, K) ((Rhs)[K].location)
+#ifndef YYLLOC_DEFAULT
+# define YYLLOC_DEFAULT(Current, Rhs, N) \
+ do \
+ if (N) \
+ { \
+ (Current).begin = YYRHSLOC (Rhs, 1).begin; \
+ (Current).end = YYRHSLOC (Rhs, N).end; \
+ } \
+ else \
+ { \
+ (Current).begin = (Current).end = YYRHSLOC (Rhs, 0).end; \
+ } \
+ while (false)
+#endif]])[
+
/* Suppress unused-variable warnings by "using" E. */
#define YYUSE(e) ((void) (e))
} \
} while (false)
-# define YY_REDUCE_PRINT(Rule) \
- do { \
+# define YY_REDUCE_PRINT(Rule) \
+ do { \
if (yydebug_) \
- yy_reduce_print_ (Rule); \
+ yy_reduce_print_ (Rule); \
} while (false)
-# define YY_STACK_PRINT() \
- do { \
+# define YY_STACK_PRINT() \
+ do { \
if (yydebug_) \
yystack_print_ (); \
} while (false)
{
]b4_symbol_foreach([b4_symbol_printer])dnl
[ default:
- break;
+ break;
}
yyo << ')';
}
[ yyla = b4_c_function_call([yylex], [symbol_type],
m4_ifdef([b4_lex_param], b4_lex_param));],
[ yyla.type = yytranslate_ (b4_c_function_call([yylex], [int],
- [[YYSTYPE*], [&yyla.value]][]dnl
+ [[YYSTYPE*], [&yyla.value]][]dnl
b4_locations_if([, [[location*], [&yyla.location]]])dnl
m4_ifdef([b4_lex_param], [, ]b4_lex_param)));])[
yyempty = false;
yyn = yytable_[yyn];
if (yyn <= 0)
{
- if (yy_table_value_is_error_ (yyn))
- goto yyerrlab;
- yyn = -yyn;
- goto yyreduce;
+ if (yy_table_value_is_error_ (yyn))
+ goto yyerrlab;
+ yyn = -yyn;
+ goto yyreduce;
}
/* Discard the token being shifted. */
switch (yyn)
{
]b4_user_actions[
- default:
+ default:
break;
}
}
/* If not already recovering from an error, report this error. */
if (!yyerrstatus_)
{
- ++yynerrs_;
- error (]b4_args(b4_locations_if([yyla.location]),
- [[yysyntax_error_ (yystack_[0].state, yyla.type)]])[);
+ ++yynerrs_;
+ error (]b4_args(b4_locations_if([yyla.location]),
+ [[yysyntax_error_ (yystack_[0].state,
+ yyempty ? yyempty_ : yyla.type)]])[);
}
]b4_locations_if([[
yyerror_range[1].location = yyla.location;]])[
if (yyerrstatus_ == 3)
{
- /* If just tried and failed to reuse lookahead token after an
+ /* If just tried and failed to reuse lookahead token after an
error, discard it. */
/* Return failure if at end of input. */
{
yy_destroy_ ("Error: discarding", yyla);
yyempty = true;
- }
+ }
}
/* Else will try to reuse lookahead token after shifting the error
| yyerrlab1 -- common code for both syntax error and YYERROR. |
`-------------------------------------------------------------*/
yyerrlab1:
- yyerrstatus_ = 3; /* Each real token shifted decrements this. */
+ yyerrstatus_ = 3; /* Each real token shifted decrements this. */
{
stack_symbol_type error_token;
for (;;)
yypop_ (yylen);
while (yystack_.size () != 1)
{
- yy_destroy_ ("Cleanup: popping", yystack_[0]);
- yypop_ ();
+ yy_destroy_ ("Cleanup: popping", yystack_[0]);
+ yypop_ ();
}
return yyresult;
]b4_parser_class_name[::yysyntax_error_ (]dnl
b4_error_verbose_if([state_type yystate, int yytoken],
[int, int])[)
- {
- std::string yyres;]b4_error_verbose_if([[
- int yyn = yypact_[yystate];
- if (yypact_ninf_ < yyn && yyn <= yylast_)
+ {]b4_error_verbose_if([[
+ std::string yyres;
+ // Number of reported tokens (one for the "unexpected", one per
+ // "expected").
+ size_t yycount = 0;
+ // Its maximum.
+ enum { YYERROR_VERBOSE_ARGS_MAXIMUM = 5 };
+ // Arguments of yyformat.
+ char const *yyarg[YYERROR_VERBOSE_ARGS_MAXIMUM];
+
+ /* There are many possibilities here to consider:
+ - 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 yytoken) 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
+ yyla. (However, yyla is currently not documented for users.)
+ - 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 (yytoken != yyempty_)
{
- /* 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_;
-
- // Number of reported tokens (one for the "unexpected", one per
- // "expected").
- size_t yycount = 0;
- // Its maximum.
- enum { YYERROR_VERBOSE_ARGS_MAXIMUM = 5 };
- // Arguments of yyformat.
- char const *yyarg[YYERROR_VERBOSE_ARGS_MAXIMUM];
yyarg[yycount++] = yytname_[yytoken];
- for (int yyx = yyxbegin; yyx < yyxend; ++yyx)
- if (yycheck_[yyx + yyn] == yyx && yyx != yyterror_
- && !yy_table_value_is_error_ (yytable_[yyx + yyn]))
+ int yyn = yypact_[yystate];
+ if (!yy_pact_value_is_default_ (yyn))
{
- if (yycount == YYERROR_VERBOSE_ARGS_MAXIMUM)
- {
- yycount = 1;
- break;
- }
- else
- yyarg[yycount++] = yytname_[yyx];
+ /* 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_;
+ for (int yyx = yyxbegin; yyx < yyxend; ++yyx)
+ if (yycheck_[yyx + yyn] == yyx && yyx != yyterror_
+ && !yy_table_value_is_error_ (yytable_[yyx + yyn]))
+ {
+ if (yycount == YYERROR_VERBOSE_ARGS_MAXIMUM)
+ {
+ yycount = 1;
+ break;
+ }
+ else
+ yyarg[yycount++] = yytname_[yyx];
+ }
}
+ }
- char const* yyformat = 0;
- switch (yycount)
- {
-#define YYCASE_(N, S) \
- case N: \
- yyformat = S; \
- break
- YYCASE_(1, YY_("syntax error, unexpected %s"));
- YYCASE_(2, YY_("syntax error, unexpected %s, expecting %s"));
- YYCASE_(3, YY_("syntax error, unexpected %s, expecting %s or %s"));
- YYCASE_(4, YY_("syntax error, unexpected %s, expecting %s or %s or %s"));
- YYCASE_(5, YY_("syntax error, unexpected %s, expecting %s or %s or %s or %s"));
+ char const* yyformat = 0;
+ switch (yycount)
+ {
+#define YYCASE_(N, S) \
+ case N: \
+ yyformat = S; \
+ break
+ YYCASE_(0, YY_("syntax error"));
+ YYCASE_(1, YY_("syntax error, unexpected %s"));
+ YYCASE_(2, YY_("syntax error, unexpected %s, expecting %s"));
+ YYCASE_(3, YY_("syntax error, unexpected %s, expecting %s or %s"));
+ YYCASE_(4, YY_("syntax error, unexpected %s, expecting %s or %s or %s"));
+ YYCASE_(5, YY_("syntax error, unexpected %s, expecting %s or %s or %s or %s"));
#undef YYCASE_
- }
- // Argument number.
- size_t yyi = 0;
- for (char const* yyp = yyformat; *yyp; ++yyp)
- if (yyp[0] == '%' && yyp[1] == 's' && yyi < yycount)
- {
- yyres += yytnamerr_ (yyarg[yyi++]);
- ++yyp;
- }
- else
- yyres += *yyp;
}
- else
- ]])dnl
-[ yyres = YY_("syntax error");
- return yyres;
+
+ // Argument number.
+ size_t yyi = 0;
+ for (char const* yyp = yyformat; *yyp; ++yyp)
+ if (yyp[0] == '%' && yyp[1] == 's' && yyi < yycount)
+ {
+ yyres += yytnamerr_ (yyarg[yyi++]);
+ ++yyp;
+ }
+ else
+ yyres += *yyp;
+ return yyres;]], [[
+ return YY_("syntax error");]])[
}
for (stack_type::const_iterator
i = yystack_.begin (),
i_end = yystack_.end ();
- i != i_end; ++i)
+ i != i_end; ++i)
*yycdebug_ << ' ' << i->state;
*yycdebug_ << std::endl;
}
int yynrhs = yyr2_[yyrule];
/* Print the symbols being reduced, and their result. */
*yycdebug_ << "Reducing stack by rule " << yyrule - 1
- << " (line " << yylno << "):" << std::endl;
+ << " (line " << yylno << "):" << std::endl;
/* The symbols being reduced. */
for (int yyi = 0; yyi < yynrhs; yyi++)
YY_SYMBOL_PRINT (" $" << yyi + 1 << " =",
projects / bison.git / blobdiff