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lalr1.cc
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# C++ skeleton for Bison
# Copyright (C) 2002-2015, 2018 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
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
m4_include(b4_pkgdatadir/[c++.m4])
# api.value.type=variant is valid.
m4_define([b4_value_type_setup_variant])
# b4_integral_parser_table_declare(TABLE-NAME, CONTENT, COMMENT)
# --------------------------------------------------------------
# Declare "parser::yy<TABLE-NAME>_" whose contents is CONTENT.
m4_define([b4_integral_parser_table_declare],
[m4_ifval([$3], [b4_comment([$3], [ ])
])dnl
static const b4_int_type_for([$2]) yy$1_[[]];dnl
])
# b4_integral_parser_table_define(TABLE-NAME, CONTENT, COMMENT)
# -------------------------------------------------------------
# Define "parser::yy<TABLE-NAME>_" whose contents is CONTENT.
m4_define([b4_integral_parser_table_define],
[ const b4_int_type_for([$2])
b4_parser_class_name::yy$1_[[]] =
{
$2
};dnl
])
# b4_symbol_value_template(VAL, [TYPE])
# -------------------------------------
# Same as b4_symbol_value, but used in a template method. It makes
# a difference when using variants. Note that b4_value_type_setup_union
# overrides b4_symbol_value, so we must override it again.
m4_copy([b4_symbol_value], [b4_symbol_value_template])
m4_append([b4_value_type_setup_union],
[m4_copy_force([b4_symbol_value_union], [b4_symbol_value_template])])
# b4_lhs_value([TYPE])
# --------------------
# Expansion of $<TYPE>$.
m4_define([b4_lhs_value],
[b4_symbol_value([yylhs.value], [$1])])
# b4_lhs_location()
# -----------------
# Expansion of @$.
m4_define([b4_lhs_location],
[yylhs.location])
# b4_rhs_data(RULE-LENGTH, NUM)
# -----------------------------
# Return the data corresponding to the symbol #NUM, where the current
# rule has RULE-LENGTH symbols on RHS.
m4_define([b4_rhs_data],
[yystack_@{b4_subtract($@)@}])
# b4_rhs_state(RULE-LENGTH, NUM)
# ------------------------------
# The state corresponding to the symbol #NUM, where the current
# rule has RULE-LENGTH symbols on RHS.
m4_define([b4_rhs_state],
[b4_rhs_data([$1], [$2]).state])
# b4_rhs_value(RULE-LENGTH, NUM, [TYPE])
# --------------------------------------
# Expansion of $<TYPE>NUM, where the current rule has RULE-LENGTH
# symbols on RHS.
m4_define([b4_rhs_value],
[b4_symbol_value([b4_rhs_data([$1], [$2]).value], [$3])])
# b4_rhs_location(RULE-LENGTH, NUM)
# ---------------------------------
# Expansion of @NUM, where the current rule has RULE-LENGTH symbols
# on RHS.
m4_define([b4_rhs_location],
[b4_rhs_data([$1], [$2]).location])
# b4_symbol_action(SYMBOL-NUM, KIND)
# ----------------------------------
# Run the action KIND (destructor or printer) for SYMBOL-NUM.
# Same as in C, but using references instead of pointers.
m4_define([b4_symbol_action],
[b4_symbol_if([$1], [has_$2],
[m4_pushdef([b4_symbol_value], m4_defn([b4_symbol_value_template]))[]dnl
b4_dollar_pushdef([yysym.value],
b4_symbol_if([$1], [has_type],
[m4_dquote(b4_symbol([$1], [type]))]),
[yysym.location])dnl
b4_symbol_case_([$1])
b4_syncline([b4_symbol([$1], [$2_line])], [b4_symbol([$1], [$2_file])])
b4_symbol([$1], [$2])
b4_syncline([@oline@], [@ofile@])
break;
m4_popdef([b4_symbol_value])[]dnl
b4_dollar_popdef[]dnl
])])
# b4_lex
# ------
# Call yylex.
m4_define([b4_lex],
[b4_token_ctor_if(
[b4_function_call([yylex],
[symbol_type], m4_ifdef([b4_lex_param], b4_lex_param))],
[b4_function_call([yylex], [int],
[b4_api_PREFIX[STYPE*], [&yyla.value]][]dnl
b4_locations_if([, [[location*], [&yyla.location]]])dnl
m4_ifdef([b4_lex_param], [, ]b4_lex_param))])])
m4_pushdef([b4_copyright_years],
[2002-2015, 2018])
m4_define([b4_parser_class_name],
[b4_percent_define_get([[parser_class_name]])])
b4_bison_locations_if([# 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])])
# b4_shared_declarations(hh|cc)
# -----------------------------
# Declaration that might either go into the header (if --defines, $1 = hh)
# or open coded in the parser body.
m4_define([b4_shared_declarations],
[b4_percent_code_get([[requires]])[
]b4_parse_assert_if([# include <cassert>])[
# include <cstdlib> // std::abort
# include <iostream>
# include <stdexcept>
# include <string>
# include <vector>]b4_defines_if([[
# include "stack.hh"
]b4_bison_locations_if([[# include "location.hh"]])])[
]b4_variant_if([b4_variant_includes])[
]b4_attribute_define[
]b4_null_define[
]b4_YYDEBUG_define[
]b4_namespace_open[
]b4_defines_if([],
[b4_stack_define
b4_bison_locations_if([b4_position_define
b4_location_define])])[
]b4_variant_if([b4_variant_define])[
/// A Bison parser.
class ]b4_parser_class_name[
{
public:
]b4_public_types_declare[
/// Build a parser object.
]b4_parser_class_name[ (]b4_parse_param_decl[);
virtual ~]b4_parser_class_name[ ();
/// Parse.
/// \returns 0 iff parsing succeeded.
virtual int parse ();
#if ]b4_api_PREFIX[DEBUG
/// The current debugging stream.
std::ostream& debug_stream () const YY_ATTRIBUTE_PURE;
/// Set the current debugging stream.
void set_debug_stream (std::ostream &);
/// Type for debugging levels.
typedef int debug_level_type;
/// The current debugging level.
debug_level_type debug_level () const YY_ATTRIBUTE_PURE;
/// Set the current debugging level.
void set_debug_level (debug_level_type l);
#endif
/// Report a syntax error.]b4_locations_if([[
/// \param loc where the syntax error is found.]])[
/// \param msg a description of the syntax error.
virtual void error (]b4_locations_if([[const location_type& loc, ]])[const std::string& msg);
/// Report a syntax error.
void error (const syntax_error& err);
private:
/// This class is not copyable.
]b4_parser_class_name[ (const ]b4_parser_class_name[&);
]b4_parser_class_name[& operator= (const ]b4_parser_class_name[&);
/// State numbers.
typedef int state_type;
/// Generate an error message.
/// \param yystate the state where the error occurred.
/// \param yyla the lookahead token.
virtual std::string yysyntax_error_ (state_type yystate,
const symbol_type& yyla) const;
/// Compute post-reduction state.
/// \param yystate the current state
/// \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
static bool yy_pact_value_is_default_ (int yyvalue);
/// Whether the given \c yytable_ value indicates a syntax error.
/// \param yyvalue the value to check
static bool yy_table_value_is_error_ (int yyvalue);
static const ]b4_int_type(b4_pact_ninf, b4_pact_ninf)[ yypact_ninf_;
static const ]b4_int_type(b4_table_ninf, b4_table_ninf)[ yytable_ninf_;
/// Convert a scanner token number \a t to a symbol number.
static token_number_type yytranslate_ (]b4_token_ctor_if([token_type], [int])[ t);
// Tables.
]b4_parser_tables_declare[]b4_error_verbose_if([
/// Convert the symbol name \a n to a form suitable for a diagnostic.
static std::string yytnamerr_ (const char *n);])[
]b4_token_table_if([], [[#if ]b4_api_PREFIX[DEBUG]])[
/// For a symbol, its name in clear.
static const char* const yytname_[];
]b4_token_table_if([[#if ]b4_api_PREFIX[DEBUG]])[
]b4_integral_parser_table_declare([rline], [b4_rline],
[[YYRLINE[YYN] -- Source line where rule number YYN was defined.]])[
/// Report on the debug stream that the rule \a r is going to be reduced.
virtual void yy_reduce_print_ (int r);
/// Print the state stack on the debug stream.
virtual void yystack_print_ ();
// Debugging.
int yydebug_;
std::ostream* yycdebug_;
/// \brief Display a symbol type, value and location.
/// \param yyo The output stream.
/// \param yysym The symbol.
template <typename Base>
void yy_print_ (std::ostream& yyo, const basic_symbol<Base>& yysym) const;
#endif
/// \brief Reclaim the memory associated to a symbol.
/// \param yymsg Why this token is reclaimed.
/// If null, print nothing.
/// \param yysym The symbol.
template <typename Base>
void yy_destroy_ (const char* yymsg, basic_symbol<Base>& yysym) const;
private:
/// Type access provider for state based symbols.
struct by_state
{
/// Default constructor.
by_state ();
/// The symbol type as needed by the constructor.
typedef state_type kind_type;
/// Constructor.
by_state (kind_type s);
/// 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).
/// \a empty_symbol when empty.
symbol_number_type type_get () const;
/// The state number used to denote an empty symbol.
enum { empty_state = -1 };
/// The state.
/// \a empty when empty.
state_type state;
};
/// "Internal" symbol: element of the stack.
struct stack_symbol_type : basic_symbol<by_state>
{
/// Superclass.
typedef basic_symbol<by_state> super_type;
/// Construct an empty symbol.
stack_symbol_type ();
/// Copy construct (for efficiency).
stack_symbol_type (const stack_symbol_type& that);
/// Steal the contents from \a sym to build this.
stack_symbol_type (state_type s, symbol_type& sym);
/// Assignment, needed by push_back.
stack_symbol_type& operator= (stack_symbol_type& that);
};
/// Stack type.
typedef stack<stack_symbol_type> stack_type;
/// The stack.
stack_type yystack_;
/// Push a new state on the stack.
/// \param m a debug message to display
/// if null, no trace is output.
/// \param s the symbol
/// \warning the contents of \a s.value is stolen.
void yypush_ (const char* m, stack_symbol_type& s);
/// Push a new look ahead token on the state on the stack.
/// \param m a debug message to display
/// if null, no trace is output.
/// \param s the state
/// \param sym the symbol (for its value and location).
/// \warning the contents of \a s.value is stolen.
void yypush_ (const char* m, state_type s, symbol_type& sym);
/// Pop \a n symbols the three stacks.
void yypop_ (unsigned n = 1);
/// Constants.
enum
{
yyeof_ = 0,
yylast_ = ]b4_last[, ///< Last index in yytable_.
yynnts_ = ]b4_nterms_number[, ///< Number of nonterminal symbols.
yyfinal_ = ]b4_final_state_number[, ///< Termination state number.
yyterror_ = 1,
yyerrcode_ = 256,
yyntokens_ = ]b4_tokens_number[ ///< Number of tokens.
};
]b4_parse_param_vars[
};
]b4_token_ctor_if([b4_yytranslate_define([$1])[
]b4_public_types_define([$1])])[
]b4_namespace_close[
]b4_percent_define_flag_if([[global_tokens_and_yystype]],
[b4_token_defines
#ifndef ]b4_api_PREFIX[STYPE
// Redirection for backward compatibility.
# define ]b4_api_PREFIX[STYPE b4_namespace_ref::b4_parser_class_name::semantic_type
#endif
])[
]b4_percent_code_get([[provides]])[
]])
b4_defines_if(
[b4_output_begin([b4_spec_defines_file])
b4_copyright([Skeleton interface for Bison LALR(1) parsers in C++])
[
/**
** \file ]b4_spec_defines_file[
** Define the ]b4_namespace_ref[::parser class.
*/
// C++ LALR(1) parser skeleton written by Akim Demaille.
]b4_cpp_guard_open([b4_spec_defines_file])[
]b4_shared_declarations(hh)[
]b4_cpp_guard_close([b4_spec_defines_file])
b4_output_end()
])
b4_output_begin([b4_parser_file_name])
b4_copyright([Skeleton implementation for Bison LALR(1) parsers in C++])
b4_percent_code_get([[top]])[]dnl
m4_if(b4_prefix, [yy], [],
[
// Take the name prefix into account.
#define yylex b4_prefix[]lex])[
// First part of user declarations.
]b4_user_pre_prologue[
]b4_null_define[
]b4_defines_if([[#include "@basename(]b4_spec_defines_file[@)"]],
[b4_shared_declarations([cc])])[
// User implementation prologue.
]b4_user_post_prologue[
]b4_percent_code_get[
#ifndef YY_
# if defined YYENABLE_NLS && YYENABLE_NLS
# if ENABLE_NLS
# include <libintl.h> // FIXME: INFRINGES ON USER NAME SPACE.
# define YY_(msgid) dgettext ("bison-runtime", msgid)
# endif
# endif
# ifndef YY_
# define YY_(msgid) msgid
# endif
#endif
// Whether we are compiled with exception support.
#ifndef YY_EXCEPTIONS
# if defined __GNUC__ && !defined __EXCEPTIONS
# define YY_EXCEPTIONS 0
# else
# define YY_EXCEPTIONS 1
# endif
#endif
]b4_locations_if([dnl
[#define YYRHSLOC(Rhs, K) ((Rhs)[K].location)
]b4_yylloc_default_define])[
// Suppress unused-variable warnings by "using" E.
#define YYUSE(E) ((void) (E))
// Enable debugging if requested.
#if ]b4_api_PREFIX[DEBUG
// A pseudo ostream that takes yydebug_ into account.
# define YYCDEBUG if (yydebug_) (*yycdebug_)
# define YY_SYMBOL_PRINT(Title, Symbol) \
do { \
if (yydebug_) \
{ \
*yycdebug_ << Title << ' '; \
yy_print_ (*yycdebug_, Symbol); \
*yycdebug_ << '\n'; \
} \
} while (false)
# define YY_REDUCE_PRINT(Rule) \
do { \
if (yydebug_) \
yy_reduce_print_ (Rule); \
} while (false)
# define YY_STACK_PRINT() \
do { \
if (yydebug_) \
yystack_print_ (); \
} while (false)
#else // !]b4_api_PREFIX[DEBUG
# define YYCDEBUG if (false) std::cerr
# define YY_SYMBOL_PRINT(Title, Symbol) YYUSE (Symbol)
# define YY_REDUCE_PRINT(Rule) static_cast<void> (0)
# define YY_STACK_PRINT() static_cast<void> (0)
#endif // !]b4_api_PREFIX[DEBUG
#define yyerrok (yyerrstatus_ = 0)
#define yyclearin (yyla.clear ())
#define YYACCEPT goto yyacceptlab
#define YYABORT goto yyabortlab
#define YYERROR goto yyerrorlab
#define YYRECOVERING() (!!yyerrstatus_)
]b4_namespace_open[]b4_error_verbose_if([[
/* Return YYSTR after stripping away unnecessary quotes and
backslashes, so that it's suitable for yyerror. The heuristic is
that double-quoting is unnecessary unless the string contains an
apostrophe, a comma, or backslash (other than backslash-backslash).
YYSTR is taken from yytname. */
std::string
]b4_parser_class_name[::yytnamerr_ (const char *yystr)
{
if (*yystr == '"')
{
std::string yyr = "";
char const *yyp = yystr;
for (;;)
switch (*++yyp)
{
case '\'':
case ',':
goto do_not_strip_quotes;
case '\\':
if (*++yyp != '\\')
goto do_not_strip_quotes;
// Fall through.
default:
yyr += *yyp;
break;
case '"':
return yyr;
}
do_not_strip_quotes: ;
}
return yystr;
}
]])[
/// Build a parser object.
]b4_parser_class_name::b4_parser_class_name[ (]b4_parse_param_decl[)]m4_ifset([b4_parse_param], [
:])[
#if ]b4_api_PREFIX[DEBUG
]m4_ifset([b4_parse_param], [ ], [ :])[yydebug_ (false),
yycdebug_ (&std::cerr)]m4_ifset([b4_parse_param], [,])[
#endif]b4_parse_param_cons[
{}
]b4_parser_class_name::~b4_parser_class_name[ ()
{}
/*---------------.
| Symbol types. |
`---------------*/
]b4_token_ctor_if([], [b4_public_types_define([cc])])[
// by_state.
]b4_parser_class_name[::by_state::by_state ()
: state (empty_state)
{}
]b4_parser_class_name[::by_state::by_state (const by_state& other)
: state (other.state)
{}
void
]b4_parser_class_name[::by_state::clear ()
{
state = empty_state;
}
void
]b4_parser_class_name[::by_state::move (by_state& that)
{
state = that.state;
that.clear ();
}
]b4_parser_class_name[::by_state::by_state (state_type s)
: state (s)
{}
]b4_parser_class_name[::symbol_number_type
]b4_parser_class_name[::by_state::type_get () const
{
if (state == empty_state)
return empty_symbol;
else
return yystos_[state];
}
]b4_parser_class_name[::stack_symbol_type::stack_symbol_type ()
{}
]b4_parser_class_name[::stack_symbol_type::stack_symbol_type (const stack_symbol_type& that)
: super_type (that.state]b4_locations_if([, that.location])[)
{
]b4_variant_if([b4_symbol_variant([that.type_get ()],
[value], [copy], [that.value])],
[[value = that.value;]])[
}
]b4_parser_class_name[::stack_symbol_type::stack_symbol_type (state_type s, symbol_type& that)
: super_type (s]b4_variant_if([], [, that.value])[]b4_locations_if([, that.location])[)
{]b4_variant_if([
b4_symbol_variant([that.type_get ()],
[value], [move], [that.value])])[
// that is emptied.
that.type = empty_symbol;
}
]b4_parser_class_name[::stack_symbol_type&
]b4_parser_class_name[::stack_symbol_type::operator= (stack_symbol_type& that)
{
state = that.state;
]b4_variant_if([b4_symbol_variant([that.type_get ()],
[value], [move], [that.value])],
[[value = that.value;]])[]b4_locations_if([
location = that.location;])[
return *this;
}
template <typename Base>
void
]b4_parser_class_name[::yy_destroy_ (const char* yymsg, basic_symbol<Base>& yysym) const
{
if (yymsg)
YY_SYMBOL_PRINT (yymsg, yysym);]b4_variant_if([], [
// User destructor.
b4_symbol_actions([destructor], [yysym.type_get ()])])[
}
#if ]b4_api_PREFIX[DEBUG
template <typename Base>
void
]b4_parser_class_name[::yy_print_ (std::ostream& yyo,
const basic_symbol<Base>& yysym) const
{
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 << ": "])[;
]b4_symbol_actions([printer])[
yyo << ')';
}
#endif
void
]b4_parser_class_name[::yypush_ (const char* m, state_type s, symbol_type& sym)
{
stack_symbol_type t (s, sym);
yypush_ (m, t);
}
void
]b4_parser_class_name[::yypush_ (const char* m, stack_symbol_type& s)
{
if (m)
YY_SYMBOL_PRINT (m, s);
yystack_.push (s);
}
void
]b4_parser_class_name[::yypop_ (unsigned n)
{
yystack_.pop (n);
}
#if ]b4_api_PREFIX[DEBUG
std::ostream&
]b4_parser_class_name[::debug_stream () const
{
return *yycdebug_;
}
void
]b4_parser_class_name[::set_debug_stream (std::ostream& o)
{
yycdebug_ = &o;
}
]b4_parser_class_name[::debug_level_type
]b4_parser_class_name[::debug_level () const
{
return yydebug_;
}
void
]b4_parser_class_name[::set_debug_level (debug_level_type l)
{
yydebug_ = l;
}
#endif // ]b4_api_PREFIX[DEBUG
]b4_parser_class_name[::state_type
]b4_parser_class_name[::yy_lr_goto_state_ (state_type yystate, int yysym)
{
int yyr = yypgoto_[yysym - yyntokens_] + yystate;
if (0 <= yyr && yyr <= yylast_ && yycheck_[yyr] == yystate)
return yytable_[yyr];
else
return yydefgoto_[yysym - yyntokens_];
}
bool
]b4_parser_class_name[::yy_pact_value_is_default_ (int yyvalue)
{
return yyvalue == yypact_ninf_;
}
bool
]b4_parser_class_name[::yy_table_value_is_error_ (int yyvalue)
{
return yyvalue == yytable_ninf_;
}
int
]b4_parser_class_name[::parse ()
{
// State.
int yyn;
/// Length of the RHS of the rule being reduced.
int yylen = 0;
// Error handling.
int yynerrs_ = 0;
int yyerrstatus_ = 0;
/// The lookahead symbol.
symbol_type yyla;]b4_locations_if([[
/// The locations where the error started and ended.
stack_symbol_type yyerror_range[3];]])[
/// The return value of parse ().
int yyresult;
#if YY_EXCEPTIONS
try
#endif // YY_EXCEPTIONS
{
YYCDEBUG << "Starting parse\n";
]m4_ifdef([b4_initial_action], [
b4_dollar_pushdef([yyla.value], [], [yyla.location])dnl
// User initialization code.
b4_user_initial_action
b4_dollar_popdef])[]dnl
[ /* Initialize the stack. The initial state will be set in
yynewstate, since the latter expects the semantical and the
location values to have been already stored, initialize these
stacks with a primary value. */
yystack_.clear ();
yypush_ (YY_NULLPTR, 0, yyla);
// A new symbol was pushed on the stack.
yynewstate:
YYCDEBUG << "Entering state " << yystack_[0].state << '\n';
// Accept?
if (yystack_[0].state == yyfinal_)
goto yyacceptlab;
goto yybackup;
// Backup.
yybackup:
// Try to take a decision without lookahead.
yyn = yypact_[yystack_[0].state];
if (yy_pact_value_is_default_ (yyn))
goto yydefault;
// Read a lookahead token.
if (yyla.empty ())
{
YYCDEBUG << "Reading a token: ";
#if YY_EXCEPTIONS
try
#endif // YY_EXCEPTIONS
{]b4_token_ctor_if([[
symbol_type yylookahead (]b4_lex[);
yyla.move (yylookahead);]], [[
yyla.type = yytranslate_ (]b4_lex[);]])[
}
#if YY_EXCEPTIONS
catch (const syntax_error& yyexc)
{
error (yyexc);
goto yyerrlab1;
}
#endif // YY_EXCEPTIONS
}
YY_SYMBOL_PRINT ("Next token is", yyla);
/* If the proper action on seeing token YYLA.TYPE is to reduce or
to detect an error, take that action. */
yyn += yyla.type_get ();
if (yyn < 0 || yylast_ < yyn || yycheck_[yyn] != yyla.type_get ())
goto yydefault;
// Reduce or error.
yyn = yytable_[yyn];
if (yyn <= 0)
{
if (yy_table_value_is_error_ (yyn))
goto yyerrlab;
yyn = -yyn;
goto yyreduce;
}
// Count tokens shifted since error; after three, turn off error status.
if (yyerrstatus_)
--yyerrstatus_;
// Shift the lookahead token.
yypush_ ("Shifting", yyn, yyla);
goto yynewstate;
/*-----------------------------------------------------------.
| yydefault -- do the default action for the current state. |
`-----------------------------------------------------------*/
yydefault:
yyn = yydefact_[yystack_[0].state];
if (yyn == 0)
goto yyerrlab;
goto yyreduce;
/*-----------------------------.
| yyreduce -- Do a reduction. |
`-----------------------------*/
yyreduce:
yylen = yyr2_[yyn];
{
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
[
// Default location.
{
slice<stack_symbol_type, stack_type> slice (yystack_, yylen);
YYLLOC_DEFAULT (yylhs.location, slice, yylen);
yyerror_range[1].location = yylhs.location;
}]])[
// Perform the reduction.
YY_REDUCE_PRINT (yyn);
#if YY_EXCEPTIONS
try
#endif // YY_EXCEPTIONS
{
switch (yyn)
{
]b4_user_actions[
default:
break;
}
}
#if YY_EXCEPTIONS
catch (const syntax_error& yyexc)
{
error (yyexc);
YYERROR;
}
#endif // YY_EXCEPTIONS
YY_SYMBOL_PRINT ("-> $$ =", yylhs);
yypop_ (yylen);
yylen = 0;
YY_STACK_PRINT ();
// Shift the result of the reduction.
yypush_ (YY_NULLPTR, yylhs);
}
goto yynewstate;
/*--------------------------------------.
| yyerrlab -- here on detecting error. |
`--------------------------------------*/
yyerrlab:
// If not already recovering from an error, report this error.
if (!yyerrstatus_)
{
++yynerrs_;
error (]b4_join(b4_locations_if([yyla.location]),
[[yysyntax_error_ (yystack_[0].state, yyla)]])[);
}
]b4_locations_if([[
yyerror_range[1].location = yyla.location;]])[
if (yyerrstatus_ == 3)
{
/* If just tried and failed to reuse lookahead token after an
error, discard it. */
// Return failure if at end of input.
if (yyla.type_get () == yyeof_)
YYABORT;
else if (!yyla.empty ())
{
yy_destroy_ ("Error: discarding", yyla);
yyla.clear ();
}
}
// Else will try to reuse lookahead token after shifting the error token.
goto yyerrlab1;
/*---------------------------------------------------.
| yyerrorlab -- error raised explicitly by YYERROR. |
`---------------------------------------------------*/
yyerrorlab:
/* Pacify compilers like GCC when the user code never invokes
YYERROR and the label yyerrorlab therefore never appears in user
code. */
if (false)
goto yyerrorlab;
/* Do not reclaim the symbols of the rule whose action triggered
this YYERROR. */
yypop_ (yylen);
yylen = 0;
goto yyerrlab1;
/*-------------------------------------------------------------.
| yyerrlab1 -- common code for both syntax error and YYERROR. |
`-------------------------------------------------------------*/
yyerrlab1:
yyerrstatus_ = 3; // Each real token shifted decrements this.
{
stack_symbol_type error_token;
for (;;)
{
yyn = yypact_[yystack_[0].state];
if (!yy_pact_value_is_default_ (yyn))
{
yyn += yyterror_;
if (0 <= yyn && yyn <= yylast_ && yycheck_[yyn] == yyterror_)
{
yyn = yytable_[yyn];
if (0 < yyn)
break;
}
}
// Pop the current state because it cannot handle the error token.
if (yystack_.size () == 1)
YYABORT;
]b4_locations_if([[
yyerror_range[1].location = yystack_[0].location;]])[
yy_destroy_ ("Error: popping", yystack_[0]);
yypop_ ();
YY_STACK_PRINT ();
}
]b4_locations_if([[
yyerror_range[2].location = yyla.location;
YYLLOC_DEFAULT (error_token.location, yyerror_range, 2);]])[
// Shift the error token.
error_token.state = yyn;
yypush_ ("Shifting", error_token);
}
goto yynewstate;
// Accept.
yyacceptlab:
yyresult = 0;
goto yyreturn;
// Abort.
yyabortlab:
yyresult = 1;
goto yyreturn;
yyreturn:
if (!yyla.empty ())
yy_destroy_ ("Cleanup: discarding lookahead", yyla);
/* Do not reclaim the symbols of the rule whose action triggered
this YYABORT or YYACCEPT. */
yypop_ (yylen);
while (1 < yystack_.size ())
{
yy_destroy_ ("Cleanup: popping", yystack_[0]);