# C++ skeleton for Bison
-# Copyright (C) 2002-2013 Free Software Foundation, Inc.
+# Copyright (C) 2002-2015 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],
- [2002-2013])
+ [2002-2015])
m4_define([b4_parser_class_name],
[b4_percent_define_get([[parser_class_name]])])
m4_define([b4_shared_declarations],
[b4_percent_code_get([[requires]])[
]b4_parse_assert_if([# include <cassert>])[
-# include <vector>
+# include <cstdlib> // std::abort
# include <iostream>
# include <stdexcept>
-# include <string>]b4_defines_if([[
+# include <string>
+# include <vector>]b4_defines_if([[
# include "stack.hh"
]b4_bison_locations_if([[# include "location.hh"]])])[
]b4_variant_if([b4_variant_includes])[
/// Generate an error message.
/// \param yystate the state where the error occurred.
- /// \param yytoken the lookahead token type, or yyempty_.
+ /// \param yyla the lookahead token.
virtual std::string yysyntax_error_ (state_type yystate,
- symbol_number_type yytoken) const;
+ const symbol_type& yyla) const;
/// Compute post-reduction state.
/// \param yystate the current state
- /// \param yylhs the nonterminal to push on the stack
- state_type yy_lr_goto_state_ (state_type yystate, int yylhs);
+ /// \param yysym the nonterminal to push on the stack
+ state_type yy_lr_goto_state_ (state_type yystate, int yysym);
/// Whether the given \c yypact_ value indicates a defaulted state.
/// \param yyvalue the value to check
/// Copy constructor.
by_state (const by_state& other);
+ /// Record that this symbol is empty.
+ void clear ();
+
/// Steal the symbol type from \a that.
void move (by_state& that);
/// The (internal) type number (corresponding to \a state).
- /// "empty" when empty.
+ /// \a empty_symbol when empty.
symbol_number_type type_get () const;
- enum { empty = 0 };
+ /// The state number used to denote an empty symbol.
+ enum { empty_state = -1 };
/// The state.
+ /// \a empty when empty.
state_type state;
};
/// Pop \a n symbols the three stacks.
void yypop_ (unsigned int n = 1);
- // Constants.
+ /// Constants.
enum
{
yyeof_ = 0,
yylast_ = ]b4_last[, ///< Last index in yytable_.
yynnts_ = ]b4_nterms_number[, ///< Number of nonterminal symbols.
- yyempty_ = -2,
yyfinal_ = ]b4_final_state_number[, ///< Termination state number.
yyterror_ = 1,
yyerrcode_ = 256,
#endif // !]b4_api_PREFIX[DEBUG
#define yyerrok (yyerrstatus_ = 0)
-#define yyclearin (yyempty = true)
+#define yyclearin (yyla.clear ())
#define YYACCEPT goto yyacceptlab
#define YYABORT goto yyabortlab
// by_state.
inline
]b4_parser_class_name[::by_state::by_state ()
- : state (empty)
+ : state (empty_state)
{}
inline
: state (other.state)
{}
+ inline
+ void
+ ]b4_parser_class_name[::by_state::clear ()
+ {
+ state = empty_state;
+ }
+
inline
void
]b4_parser_class_name[::by_state::move (by_state& that)
{
state = that.state;
- that.state = empty;
+ that.clear ();
}
inline
]b4_parser_class_name[::symbol_number_type
]b4_parser_class_name[::by_state::type_get () const
{
- return state == empty ? 0 : yystos_[state];
+ if (state == empty_state)
+ return empty_symbol;
+ else
+ return yystos_[state];
}
inline
[value], [move], [that.value])],
[[value = that.value;]])[
// that is emptied.
- that.type = empty;
+ that.type = empty_symbol;
}
inline
std::ostream& yyoutput = yyo;
YYUSE (yyoutput);
symbol_number_type yytype = yysym.type_get ();
+ // Avoid a (spurious) G++ 4.8 warning about "array subscript is
+ // below array bounds".
+ if (yysym.empty ())
+ std::abort ();
yyo << (yytype < yyntokens_ ? "token" : "nterm")
<< ' ' << yytname_[yytype] << " ("]b4_locations_if([
<< yysym.location << ": "])[;
#endif // ]b4_api_PREFIX[DEBUG
inline ]b4_parser_class_name[::state_type
- ]b4_parser_class_name[::yy_lr_goto_state_ (state_type yystate, int yylhs)
+ ]b4_parser_class_name[::yy_lr_goto_state_ (state_type yystate, int yysym)
{
- int yyr = yypgoto_[yylhs - yyntokens_] + yystate;
+ int yyr = yypgoto_[yysym - yyntokens_] + yystate;
if (0 <= yyr && yyr <= yylast_ && yycheck_[yyr] == yystate)
return yytable_[yyr];
else
- return yydefgoto_[yylhs - yyntokens_];
+ return yydefgoto_[yysym - yyntokens_];
}
inline bool
int
]b4_parser_class_name[::parse ()
{
- /// Whether yyla contains a lookahead.
- bool yyempty = true;
-
// State.
int yyn;
+ /// Length of the RHS of the rule being reduced.
int yylen = 0;
// Error handling.
/// The locations where the error started and ended.
stack_symbol_type yyerror_range[3];]])[
- /// $$ and @@$.
- stack_symbol_type yylhs;
-
/// The return value of parse ().
int yyresult;
location values to have been already stored, initialize these
stacks with a primary value. */
yystack_.clear ();
- yypush_ (YY_NULL, 0, yyla);
+ yypush_ (YY_NULLPTR, 0, yyla);
// A new symbol was pushed on the stack.
yynewstate:
goto yydefault;
// Read a lookahead token.
- if (yyempty)
+ if (yyla.empty ())
{
YYCDEBUG << "Reading a token: ";
try
error (yyexc);
goto yyerrlab1;
}
- yyempty = false;
}
YY_SYMBOL_PRINT ("Next token is", yyla);
goto yyreduce;
}
- // Discard the token being shifted.
- yyempty = true;
-
// Count tokens shifted since error; after three, turn off error status.
if (yyerrstatus_)
--yyerrstatus_;
`-----------------------------*/
yyreduce:
yylen = yyr2_[yyn];
- yylhs.state = yy_lr_goto_state_(yystack_[yylen].state, yyr1_[yyn]);]b4_variant_if([
- /* Variants are always initialized to an empty instance of the
- correct type. The default $$=$1 action is NOT applied when using
- variants. */
- b4_symbol_variant([[yyr1_@{yyn@}]], [yylhs.value], [build])],[
- /* If YYLEN is nonzero, implement the default value of the action:
- '$$ = $1'. Otherwise, use the top of the stack.
-
- Otherwise, the following line sets YYLHS.VALUE to garbage.
- This behavior is undocumented and Bison
- users should not rely upon it. */
- if (yylen)
- yylhs.value = yystack_@{yylen - 1@}.value;
- else
- yylhs.value = yystack_@{0@}.value;])[
+ {
+ stack_symbol_type yylhs;
+ yylhs.state = yy_lr_goto_state_(yystack_[yylen].state, yyr1_[yyn]);]b4_variant_if([
+ /* Variants are always initialized to an empty instance of the
+ correct type. The default '$$ = $1' action is NOT applied
+ when using variants. */
+ b4_symbol_variant([[yyr1_@{yyn@}]], [yylhs.value], [build])], [
+ /* If YYLEN is nonzero, implement the default value of the
+ action: '$$ = $1'. Otherwise, use the top of the stack.
+
+ Otherwise, the following line sets YYLHS.VALUE to garbage.
+ This behavior is undocumented and Bison users should not rely
+ upon it. */
+ if (yylen)
+ yylhs.value = yystack_@{yylen - 1@}.value;
+ else
+ yylhs.value = yystack_@{0@}.value;])[
]b4_locations_if([dnl
[
- // Compute the default @@$.
- {
- slice<stack_symbol_type, stack_type> slice (yystack_, yylen);
- YYLLOC_DEFAULT (yylhs.location, slice, yylen);
- }]])[
-
- // Perform the reduction.
- YY_REDUCE_PRINT (yyn);
- try
+ // Compute the default @@$.
{
- switch (yyn)
- {
+ slice<stack_symbol_type, stack_type> slice (yystack_, yylen);
+ YYLLOC_DEFAULT (yylhs.location, slice, yylen);
+ }]])[
+
+ // Perform the reduction.
+ YY_REDUCE_PRINT (yyn);
+ try
+ {
+ switch (yyn)
+ {
]b4_user_actions[
- default:
- break;
- }
- }
- catch (const syntax_error& yyexc)
- {
- error (yyexc);
- YYERROR;
- }
- YY_SYMBOL_PRINT ("-> $$ =", yylhs);
- yypop_ (yylen);
- yylen = 0;
- YY_STACK_PRINT ();
+ default:
+ break;
+ }
+ }
+ catch (const syntax_error& yyexc)
+ {
+ error (yyexc);
+ YYERROR;
+ }
+ YY_SYMBOL_PRINT ("-> $$ =", yylhs);
+ yypop_ (yylen);
+ yylen = 0;
+ YY_STACK_PRINT ();
- // Shift the result of the reduction.
- yypush_ (YY_NULL, yylhs);
+ // Shift the result of the reduction.
+ yypush_ (YY_NULLPTR, yylhs);
+ }
goto yynewstate;
/*--------------------------------------.
{
++yynerrs_;
error (]b4_join(b4_locations_if([yyla.location]),
- [[yysyntax_error_ (yystack_[0].state,
- yyempty ? yyempty_ : yyla.type_get ())]])[);
+ [[yysyntax_error_ (yystack_[0].state, yyla)]])[);
}
]b4_locations_if([[
// Return failure if at end of input.
if (yyla.type_get () == yyeof_)
YYABORT;
- else if (!yyempty)
+ else if (!yyla.empty ())
{
yy_destroy_ ("Error: discarding", yyla);
- yyempty = true;
+ yyla.clear ();
}
}
code. */
if (false)
goto yyerrorlab;]b4_locations_if([[
- yyerror_range[1].location = yystack_[yylen - 1].location;]])b4_variant_if([[
- /* $$ was initialized before running the user action. */
- YY_SYMBOL_PRINT ("Error: discarding", yylhs);
- yylhs.~stack_symbol_type();]])[
+ yyerror_range[1].location = yystack_[yylen - 1].location;]])[
/* Do not reclaim the symbols of the rule whose action triggered
this YYERROR. */
yypop_ (yylen);
goto yyreturn;
yyreturn:
- if (!yyempty)
+ if (!yyla.empty ())
yy_destroy_ ("Cleanup: discarding lookahead", yyla);
/* Do not reclaim the symbols of the rule whose action triggered
<< std::endl;
// Do not try to display the values of the reclaimed symbols,
// as their printer might throw an exception.
- if (!yyempty)
- yy_destroy_ (YY_NULL, yyla);
+ if (!yyla.empty ())
+ yy_destroy_ (YY_NULLPTR, yyla);
while (1 < yystack_.size ())
{
- yy_destroy_ (YY_NULL, yystack_[0]);
+ yy_destroy_ (YY_NULLPTR, yystack_[0]);
yypop_ ();
}
throw;
// Generate an error message.
std::string
]b4_parser_class_name[::yysyntax_error_ (]dnl
-b4_error_verbose_if([state_type yystate, symbol_number_type yytoken],
- [state_type, symbol_number_type])[) const
+b4_error_verbose_if([state_type yystate, const symbol_type& yyla],
+ [state_type, const symbol_type&])[) const
{]b4_error_verbose_if([[
- std::string yyres;
// Number of reported tokens (one for the "unexpected", one per
// "expected").
size_t yycount = 0;
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
+ - The only way there can be no lookahead present (in yyla) 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
token that will not be accepted due to an error action in a
later state.
*/
- if (yytoken != yyempty_)
+ if (!yyla.empty ())
{
+ int yytoken = yyla.type_get ();
yyarg[yycount++] = yytname_[yytoken];
int yyn = yypact_[yystate];
if (!yy_pact_value_is_default_ (yyn))
}
}
- char const* yyformat = YY_NULL;
+ char const* yyformat = YY_NULLPTR;
switch (yycount)
{
#define YYCASE_(N, S) \
#undef YYCASE_
}
+ std::string yyres;
// Argument number.
size_t yyi = 0;
for (char const* yyp = yyformat; *yyp; ++yyp)
projects / bison.git / blobdiff