# C++ skeleton for Bison
-# Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
-# Free Software Foundation, Inc.
+# Copyright (C) 2002-2013 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
# b4_integral_parser_table_declare(TABLE-NAME, CONTENT, COMMENT)
# --------------------------------------------------------------
-# Declare "parser::yy<TABLE-NAME>_" which contents is CONTENT.
+# Declare "parser::yy<TABLE-NAME>_" whose contents is CONTENT.
m4_define([b4_integral_parser_table_declare],
-[m4_ifval([$3], [b4_c_comment([$3], [ ])
+[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>_" which contents is CONTENT.
+# -------------------------------------------------------------
+# 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_[[]] =
# Same as in C, but using references instead of pointers.
m4_define([b4_symbol_action],
[b4_symbol_if([$1], [has_$2],
-[m4_pushdef([b4_dollar_dollar],
- [b4_symbol_value_template([yysym.value],
- b4_symbol_if([$1], [has_type],
- [b4_symbol([$1], [type])]))])dnl
-m4_pushdef([b4_at_dollar], [yysym.location])dnl
+[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_at_dollar])dnl
-m4_popdef([b4_dollar_dollar])dnl
+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, 2003, 2004, 2005, 2006, 2007, 2008, 2009])
+ [2002-2013])
m4_define([b4_parser_class_name],
[b4_percent_define_get([[parser_class_name]])])
-# The header is mandatory.
-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_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])])
-# We do want M4 expansion after # for CPP macros.
-m4_changecom()
-m4_divert_push(0)dnl
-@output(b4_spec_defines_file@)@
-b4_copyright([Skeleton interface for Bison LALR(1) parsers in C++])
-dnl FIXME: This is wrong, we want computed header guards.
-[
-/* C++ LALR(1) parser skeleton written by Akim Demaille. */
-
-#ifndef PARSER_HEADER_H
-# define PARSER_HEADER_H
-
-]b4_percent_code_get([[requires]])[
-
-]b4_parse_assert_if([#include <cassert>])[
-#include <string>
-#include <iostream>
-#include "stack.hh"
+# b4_shared_declarations
+# ----------------------
+# Declaration that might either go into the header (if --defines)
+# or open coded in the parser body.
+m4_define([b4_shared_declarations],
+[b4_percent_code_get([[requires]])[
+]b4_parse_assert_if([# include <cassert>])[
+# include <vector>
+# include <iostream>
+# include <stdexcept>
+# include <string>]b4_defines_if([[
+# include "stack.hh"
+]b4_bison_locations_if([[# include "location.hh"]])])[
+]b4_variant_if([b4_variant_includes])[
+
+]b4_YYDEBUG_define[
]b4_namespace_open[
-]b4_locations_if([ class position;
- class location;])[
-]b4_variant_if([b4_variant_define])[
-]b4_namespace_close[
-]b4_locations_if([#include "location.hh"])[
+]b4_defines_if([],
+[b4_stack_define
+b4_bison_locations_if([b4_position_define
+b4_location_define])])[
-/* Enabling traces. */
-#ifndef YYDEBUG
-# define YYDEBUG ]b4_parse_trace_if([1], [0])[
-#endif
-
-/* Enabling verbose error messages. */
-#ifdef YYERROR_VERBOSE
-# undef YYERROR_VERBOSE
-# define YYERROR_VERBOSE 1
-#else
-# define YYERROR_VERBOSE ]b4_error_verbose_if([1], [0])[
-#endif
-
-/* Enabling the token table. */
-#ifndef YYTOKEN_TABLE
-# 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[
+]b4_variant_if([b4_variant_define])[
/// A Bison parser.
class ]b4_parser_class_name[
/// \returns 0 iff parsing succeeded.
virtual int parse ();
-#if YYDEBUG
+#if ]b4_api_PREFIX[DEBUG
/// The current debugging stream.
std::ostream& debug_stream () const;
/// Set the current debugging stream.
void set_debug_level (debug_level_type l);
#endif
- /// Report a syntax error.]b4_locations_if([
- /// \param loc where the syntax error is found.])[
+ /// 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);
+ 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:
/// State numbers.
/// Generate an error message.
/// \param yystate the state where the error occurred.
- /// \param yytoken the lookahead token.
- virtual std::string yysyntax_error_ (state_type yystate, int yytoken);
+ /// \param yytoken the lookahead token type, or yyempty_.
+ virtual std::string yysyntax_error_ (state_type yystate,
+ symbol_number_type yytoken) const;
/// Compute post-reduction state.
/// \param yystate the current state
/// \param yyvalue the value to check
static bool yy_table_value_is_error_ (int yyvalue);
- /// Internal symbol numbers.
- typedef ]b4_int_type_for([b4_translate])[ token_number_type;
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_;
- /* Tables. */
-]b4_parser_tables_declare[
+ /// Convert a scanner token number \a t to a symbol number.
+ static token_number_type yytranslate_ (]b4_token_ctor_if([token_type], [int])[ t);
-#if YYDEBUG || YYERROR_VERBOSE || YYTOKEN_TABLE
- /// For a symbol, its name in clear.
- static const char* const yytname_[];
-#endif]b4_error_verbose_if([
+ // 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);])[
-#if YYDEBUG
+]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.])[
+ [[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. */
+ // Debugging.
int yydebug_;
std::ostream* yycdebug_;
-#endif
-
- /// Convert a scanner token number \a t to a symbol number.
- static inline token_number_type yytranslate_ (]b4_lex_symbol_if([token_type], [int])[ t);
-#if YYDEBUG
/// \brief Display a symbol type, value and location.
/// \param yyo The output stream.
/// \param yysym The symbol.
- template <typename Exact>
- void yy_print_ (std::ostream& yyo,
- const symbol_base_type<Exact>& yysym) const;
+ 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 s The symbol.
- template <typename Exact>
- inline void yy_destroy_ (const char* yymsg,
- symbol_base_type<Exact>& yysym) const;
+ template <typename Base>
+ void yy_destroy_ (const char* yymsg, basic_symbol<Base>& yysym) const;
private:
- /// Element of the stack: a state and its attributes.
- struct stack_symbol_type : symbol_base_type<stack_symbol_type>
+ /// Type access provider for state based symbols.
+ struct by_state
{
- /// The parent class.
- typedef symbol_base_type<stack_symbol_type> super_type;
-
/// Default constructor.
- inline stack_symbol_type ();
+ by_state ();
+
+ /// The symbol type as needed by the constructor.
+ typedef state_type kind_type;
/// Constructor.
- inline stack_symbol_type (]b4_args([state_type s],
- [const semantic_type& v],
- b4_locations_if([const location_type& l]))[);
+ by_state (kind_type s);
+
+ /// Copy constructor.
+ by_state (const by_state& other);
+
+ /// Steal the symbol type from \a that.
+ void move (by_state& that);
+
+ /// The (internal) type number (corresponding to \a state).
+ /// "empty" when empty.
+ symbol_number_type type_get () const;
+
+ enum { empty = 0 };
/// The state.
state_type state;
+ };
- /// Return the type corresponding to this state.
- inline int type_get_ () const;
+ /// "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 ();
+ /// 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= (const stack_symbol_type& that);
};
/// Stack type.
/// if null, no trace is output.
/// \param s the symbol
/// \warning the contents of \a s.value is stolen.
- inline void yypush_ (const char* m, stack_symbol_type& s);
+ 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
/// \param s the state
/// \param sym the symbol (for its value and location).
/// \warning the contents of \a s.value is stolen.
- inline void yypush_ (const char* m, state_type s, symbol_type& sym);
+ void yypush_ (const char* m, state_type s, symbol_type& sym);
/// Pop \a n symbols the three stacks.
- inline void yypop_ (unsigned int n = 1);
+ void yypop_ (unsigned int n = 1);
- /* Constants. */
+ // Constants.
enum
{
yyeof_ = 0,
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[
};
-]b4_lex_symbol_if([b4_yytranslate_define
+]b4_token_ctor_if([b4_yytranslate_define
b4_public_types_define])[
]b4_namespace_close[
]b4_percent_define_flag_if([[global_tokens_and_yystype]],
-[b4_token_defines(b4_tokens)
+[b4_token_defines
-#ifndef YYSTYPE
- /* Redirection for backward compatibility. */
-# define YYSTYPE b4_namespace_ref::b4_parser_class_name::semantic_type
+#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[
+]b4_cpp_guard_close([b4_spec_defines_file])
+b4_output_end()
])
-b4_percent_code_get([[provides]])[]dnl
-[#endif /* ! defined PARSER_HEADER_H */]
-@output(b4_parser_file_name@)@
+
+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. */
+// First part of user declarations.
]b4_user_pre_prologue[
-#include "@basename(]b4_spec_defines_file[@)"
+]b4_null_define[
+
+]b4_defines_if([[#include "@basename(]b4_spec_defines_file[@)"]],
+ [b4_shared_declarations])[
-/* User implementation prologue. */
-]b4_user_post_prologue
-b4_percent_code_get[]dnl
+// User implementation prologue.
+]b4_user_post_prologue[
+]b4_percent_code_get[
-[#ifndef YY_
-# if YYENABLE_NLS
+#ifndef YY_
+# if defined YYENABLE_NLS && YYENABLE_NLS
# if ENABLE_NLS
-# include <libintl.h> /* FIXME: INFRINGES ON USER NAME SPACE */
+# include <libintl.h> // FIXME: INFRINGES ON USER NAME SPACE.
# define YY_(msgid) dgettext ("bison-runtime", msgid)
# endif
# endif
# endif
#endif
-/* Suppress unused-variable warnings by "using" E. */
-#define YYUSE(e) ((void) (e))
+]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 YYDEBUG
+// Enable debugging if requested.
+#if ]b4_api_PREFIX[DEBUG
-/* A pseudo ostream that takes yydebug_ into account. */
+// A pseudo ostream that takes yydebug_ into account.
# define YYCDEBUG if (yydebug_) (*yycdebug_)
# define YY_SYMBOL_PRINT(Title, Symbol) \
} \
} 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)
-#else /* !YYDEBUG */
+#else // !]b4_api_PREFIX[DEBUG
# define YYCDEBUG if (false) std::cerr
-# define YY_SYMBOL_PRINT(Title, Symbol) static_cast<void>(0)
+# 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 /* !YYDEBUG */
+#endif // !]b4_api_PREFIX[DEBUG
#define yyerrok (yyerrstatus_ = 0)
#define yyclearin (yyempty = true)
case '\\':
if (*++yyp != '\\')
goto do_not_strip_quotes;
- /* Fall through. */
+ // Fall through.
default:
yyr += *yyp;
break;
/// Build a parser object.
]b4_parser_class_name::b4_parser_class_name[ (]b4_parse_param_decl[)]m4_ifset([b4_parse_param], [
:])[
-#if YYDEBUG
+#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_lex_symbol_if([], [b4_public_types_define])[
+]b4_token_ctor_if([], [b4_public_types_define])[
- // stack_symbol_type.
- ]b4_parser_class_name[::stack_symbol_type::stack_symbol_type ()
- : super_type ()
- , state ()
+ // by_state.
+ inline
+ ]b4_parser_class_name[::by_state::by_state ()
+ : state (empty)
+ {}
+
+ inline
+ ]b4_parser_class_name[::by_state::by_state (const by_state& other)
+ : state (other.state)
+ {}
+
+ inline
+ void
+ ]b4_parser_class_name[::by_state::move (by_state& that)
{
+ state = that.state;
+ that.state = empty;
}
- ]b4_parser_class_name[::stack_symbol_type::stack_symbol_type (]b4_args(
- [state_type s],
- [const semantic_type& v],
- b4_locations_if([const location_type& l]))[)
- : super_type (v]b4_locations_if([, l])[)
- , state (s)
+ inline
+ ]b4_parser_class_name[::by_state::by_state (state_type s)
+ : state (s)
+ {}
+
+ inline
+ ]b4_parser_class_name[::symbol_number_type
+ ]b4_parser_class_name[::by_state::type_get () const
{
+ return state == empty ? 0 : yystos_[state];
}
- int
- ]b4_parser_class_name[::stack_symbol_type::type_get_ () const
+ inline
+ ]b4_parser_class_name[::stack_symbol_type::stack_symbol_type ()
+ {}
+
+
+ inline
+ ]b4_parser_class_name[::stack_symbol_type::stack_symbol_type (state_type s, symbol_type& that)
+ : super_type (s]b4_locations_if([, that.location])[)
+ {
+ ]b4_variant_if([b4_symbol_variant([that.type_get ()],
+ [value], [move], [that.value])],
+ [[value = that.value;]])[
+ // that is emptied.
+ that.type = empty;
+ }
+
+ inline
+ ]b4_parser_class_name[::stack_symbol_type&
+ ]b4_parser_class_name[::stack_symbol_type::operator= (const stack_symbol_type& that)
{
- return yystos_[state];
+ state = that.state;
+ ]b4_variant_if([b4_symbol_variant([that.type_get ()],
+ [value], [copy], [that.value])],
+ [[value = that.value;]])[]b4_locations_if([
+ location = that.location;])[
+ return *this;
}
- template <typename Exact>
+ template <typename Base>
+ inline
void
- ]b4_parser_class_name[::yy_destroy_ (const char* yymsg,
- symbol_base_type<Exact>& yysym) const
+ ]b4_parser_class_name[::yy_destroy_ (const char* yymsg, basic_symbol<Base>& yysym) const
{
- int yytype = yysym.type_get ();
- YYUSE (yymsg);
if (yymsg)
- YY_SYMBOL_PRINT (yymsg, yysym);
+ YY_SYMBOL_PRINT (yymsg, yysym);]b4_variant_if([], [
// User destructor.
+ symbol_number_type yytype = yysym.type_get ();
switch (yytype)
{
]b4_symbol_foreach([b4_symbol_destructor])dnl
[ default:
break;
- }]b4_variant_if([
-
- // Type destructor.
- b4_symbol_variant([[yytype]], [[yysym.value]], [[template destroy]])])[
+ }])[
}
-#if YYDEBUG
- template <typename Exact>
+#if ]b4_api_PREFIX[DEBUG
+ template <typename Base>
void
]b4_parser_class_name[::yy_print_ (std::ostream& yyo,
- const symbol_base_type<Exact>& yysym) const
+ const basic_symbol<Base>& yysym) const
{
- int yytype = yysym.type_get ();
+ std::ostream& yyoutput = yyo;
+ YYUSE (yyoutput);
+ symbol_number_type yytype = yysym.type_get ();
yyo << (yytype < yyntokens_ ? "token" : "nterm")
<< ' ' << yytname_[yytype] << " ("]b4_locations_if([
<< yysym.location << ": "])[;
{
]b4_symbol_foreach([b4_symbol_printer])dnl
[ default:
- break;
+ break;
}
yyo << ')';
}
#endif
+ inline
void
- ]b4_parser_class_name[::yypush_ (const char* m, state_type s,
- symbol_type& sym)
+ ]b4_parser_class_name[::yypush_ (const char* m, state_type s, symbol_type& sym)
{
- if (m)
- YY_SYMBOL_PRINT (m, sym);
-]b4_variant_if(
-[[ yystack_.push (stack_symbol_type (]b4_args(
- [s],
- [semantic_type()],
- b4_locations_if([sym.location]))[));
- ]b4_symbol_variant([[yystos_[s]]], [[yystack_[0].value]],
- [build], [sym.value])],
-[[ yystack_.push (stack_symbol_type (]b4_args(
- [s],
- [sym.value],
- b4_locations_if([sym.location]))[));]])[
+ stack_symbol_type t (s, sym);
+ yypush_ (m, t);
}
+ inline
void
]b4_parser_class_name[::yypush_ (const char* m, stack_symbol_type& s)
{
if (m)
YY_SYMBOL_PRINT (m, s);
-]b4_variant_if(
-[[ yystack_.push (stack_symbol_type (]b4_args(
- [s.state],
- [semantic_type()],
- b4_locations_if([s.location]))[));
- ]b4_symbol_variant([[yystos_[s.state]]], [[yystack_[0].value]],
- [build], [s.value])],
-[ yystack_.push (s);])[
+ yystack_.push (s);
}
+ inline
void
]b4_parser_class_name[::yypop_ (unsigned int n)
{
yystack_.pop (n);
}
-#if YYDEBUG
+#if ]b4_api_PREFIX[DEBUG
std::ostream&
]b4_parser_class_name[::debug_stream () const
{
{
yydebug_ = l;
}
-#endif
+#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)
/// Whether yyla contains a lookahead.
bool yyempty = true;
- /* State. */
+ // State.
int yyn;
int yylen = 0;
- /* Error handling. */
+ // Error handling.
int yynerrs_ = 0;
int yyerrstatus_ = 0;
symbol_type yyla;]b4_locations_if([[
/// The locations where the error started and ended.
- stack_symbol_type yyerror_range[2];]])[
+ stack_symbol_type yyerror_range[3];]])[
/// $$ and @@$.
stack_symbol_type yylhs;
- /// The return value of parse().
+ /// The return value of parse ().
int yyresult;
+ // FIXME: This shoud be completely indented. It is not yet to
+ // avoid gratuitous conflicts when merging into the master branch.
+ try
+ {
YYCDEBUG << "Starting parse" << std::endl;
]m4_ifdef([b4_initial_action], [
-m4_pushdef([b4_at_dollar], [yyla.location])dnl
-m4_pushdef([b4_dollar_dollar], [yyla.value])dnl
- /* User initialization code. */
+b4_dollar_pushdef([yyla.value], [], [yyla.location])dnl
+ // User initialization code.
b4_user_initial_action
-m4_popdef([b4_dollar_dollar])dnl
-m4_popdef([b4_at_dollar])])dnl
+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_ = stack_type (0);
- yypush_ (0, 0, yyla);
+ yypush_ (YY_NULL, 0, yyla);
// A new symbol was pushed on the stack.
yynewstate:
YYCDEBUG << "Entering state " << yystack_[0].state << std::endl;
- /* Accept? */
+ // Accept?
if (yystack_[0].state == yyfinal_)
goto yyacceptlab;
goto yybackup;
- /* Backup. */
+ // Backup.
yybackup:
- /* Try to take a decision without lookahead. */
+ // 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. */
+ // Read a lookahead token.
if (yyempty)
{
YYCDEBUG << "Reading a token: ";
-]b4_lex_symbol_if(
-[ 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
-b4_locations_if([, [[location*], [&yyla.location]]])dnl
-m4_ifdef([b4_lex_param], [, ]b4_lex_param)));])[
+ try
+ {]b4_token_ctor_if([[
+ symbol_type yylookahead (]b4_lex[);
+ yyla.move (yylookahead);]], [[
+ yyla.type = yytranslate_ (]b4_lex[);]])[
+ }
+ catch (const syntax_error& yyexc)
+ {
+ error (yyexc);
+ goto yyerrlab1;
+ }
yyempty = false;
}
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;
- if (yyn < 0 || yylast_ < yyn || yycheck_[yyn] != yyla.type)
+ yyn += yyla.type_get ();
+ if (yyn < 0 || yylast_ < yyn || yycheck_[yyn] != yyla.type_get ())
goto yydefault;
- /* Reduce or error. */
+ // Reduce or error.
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. */
+ // Discard the token being shifted.
yyempty = true;
- /* Count tokens shifted since error; after three, turn off error
- status. */
+ // Count tokens shifted since error; after three, turn off error status.
if (yyerrstatus_)
--yyerrstatus_;
- /* Shift the lookahead token. */
+ // Shift the lookahead token.
yypush_ ("Shifting", yyn, yyla);
goto yynewstate;
// Perform the reduction.
YY_REDUCE_PRINT (yyn);
- switch (yyn)
+ try
{
+ switch (yyn)
+ {
]b4_user_actions[
- default:
- break;
+ default:
+ break;
+ }
+ }
+ catch (const syntax_error& yyexc)
+ {
+ error (yyexc);
+ YYERROR;
}
YY_SYMBOL_PRINT ("-> $$ =", yylhs);
-]b4_variant_if([[
- // Destroy the rhs symbols.
- for (int i = 0; i < yylen; ++i)
- // Destroy a variant which value may have been swapped with
- // yylhs.value (for instance if the action was "std::swap($$,
- // $1)"). The value of yylhs.value (hence possibly one of these
- // rhs symbols) depends on the default contruction for this
- // type. In the case of pointers for instance, no
- // initialization is done, so the value is junk. Therefore do
- // not try to report the value of symbols about to be destroyed
- // in the debug trace, it's possibly junk. Hence yymsg = 0.
- // Besides, that keeps exactly the same traces as with the other
- // Bison skeletons.
- yy_destroy_ (0, yystack_[i]);]])[
-
yypop_ (yylen);
yylen = 0;
YY_STACK_PRINT ();
- /* Shift the result of the reduction. */
- yypush_ (0, yylhs);
+ // Shift the result of the reduction.
+ yypush_ (YY_NULL, yylhs);
goto yynewstate;
/*--------------------------------------.
| yyerrlab -- here on detecting error. |
`--------------------------------------*/
yyerrlab:
- /* If not already recovering from an error, report this error. */
+ // 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_join(b4_locations_if([yyla.location]),
+ [[yysyntax_error_ (yystack_[0].state,
+ yyempty ? yyempty_ : yyla.type_get ())]])[);
}
]b4_locations_if([[
- yyerror_range[0].location = yyla.location;]])[
+ 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. */
- if (yyla.type == yyeof_)
+ // Return failure if at end of input.
+ if (yyla.type_get () == yyeof_)
YYABORT;
- else
+ else if (!yyempty)
{
yy_destroy_ ("Error: discarding", yyla);
yyempty = true;
- }
+ }
}
- /* Else will try to reuse lookahead token after shifting the error
- token. */
+ // Else will try to reuse lookahead token after shifting the error token.
goto yyerrlab1;
code. */
if (false)
goto yyerrorlab;]b4_locations_if([[
- yyerror_range[0].location = yystack_[yylen - 1].location;]])b4_variant_if([[
+ yyerror_range[1].location = yystack_[yylen - 1].location;]])b4_variant_if([[
/* $$ was initialized before running the user action. */
- yy_destroy_ ("Error: discarding", yylhs);]])[
- /* Do not reclaim the symbols of the rule which action triggered
+ YY_SYMBOL_PRINT ("Error: discarding", yylhs);
+ yylhs.~stack_symbol_type();]])[
+ /* Do not reclaim the symbols of the rule whose action triggered
this YYERROR. */
yypop_ (yylen);
yylen = 0;
| 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 (;;)
if (yystack_.size () == 1)
YYABORT;
]b4_locations_if([[
- yyerror_range[0].location = yystack_[0].location;]])[
+ yyerror_range[1].location = yystack_[0].location;]])[
yy_destroy_ ("Error: popping", yystack_[0]);
yypop_ ();
YY_STACK_PRINT ();
}
]b4_locations_if([[
- yyerror_range[1].location = yyla.location;
- YYLLOC_DEFAULT (error_token.location, (yyerror_range - 1), 2);]])[
+ yyerror_range[2].location = yyla.location;
+ YYLLOC_DEFAULT (error_token.location, yyerror_range, 2);]])[
- /* Shift the error token. */
+ // Shift the error token.
error_token.state = yyn;
yypush_ ("Shifting", error_token);
}
goto yynewstate;
- /* Accept. */
+ // Accept.
yyacceptlab:
yyresult = 0;
goto yyreturn;
- /* Abort. */
+ // Abort.
yyabortlab:
yyresult = 1;
goto yyreturn;
if (!yyempty)
yy_destroy_ ("Cleanup: discarding lookahead", yyla);
- /* Do not reclaim the symbols of the rule which action triggered
+ /* Do not reclaim the symbols of the rule whose action triggered
this YYABORT or YYACCEPT. */
yypop_ (yylen);
- while (yystack_.size () != 1)
+ while (1 < yystack_.size ())
{
- yy_destroy_ ("Cleanup: popping", yystack_[0]);
- yypop_ ();
+ yy_destroy_ ("Cleanup: popping", yystack_[0]);
+ yypop_ ();
}
return yyresult;
}
+ catch (...)
+ {
+ YYCDEBUG << "Exception caught: cleaning lookahead and stack"
+ << 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);
+
+ while (1 < yystack_.size ())
+ {
+ yy_destroy_ (YY_NULL, yystack_[0]);
+ yypop_ ();
+ }
+ throw;
+ }
+ }
+
+ void
+ ]b4_parser_class_name[::error (const syntax_error& yyexc)
+ {
+ error (]b4_join(b4_locations_if([yyexc.location]),
+ [[yyexc.what()]])[);
+ }
// Generate an error message.
std::string
]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([state_type yystate, symbol_number_type yytoken],
+ [state_type, symbol_number_type])[) const
+ {]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 = YY_NULL;
+ 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");]])[
}
]b4_parser_tables_define[
-#if YYDEBUG || YYERROR_VERBOSE || YYTOKEN_TABLE
- /* YYTNAME[SYMBOL-NUM] -- String name of the symbol SYMBOL-NUM.
- First, the terminals, then, starting at \a yyntokens_, nonterminals. */
+]b4_token_table_if([], [[#if ]b4_api_PREFIX[DEBUG]])[
+ // YYTNAME[SYMBOL-NUM] -- String name of the symbol SYMBOL-NUM.
+ // First, the terminals, then, starting at \a yyntokens_, nonterminals.
const char*
const ]b4_parser_class_name[::yytname_[] =
{
]b4_tname[
};
-#endif
-#if YYDEBUG
+]b4_token_table_if([[#if ]b4_api_PREFIX[DEBUG]])[
]b4_integral_parser_table_define([rline], [b4_rline])[
// Print the state stack on the debug stream.
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;
}
{
unsigned int yylno = yyrline_[yyrule];
int yynrhs = yyr2_[yyrule];
- /* Print the symbols being reduced, and their result. */
+ // Print the symbols being reduced, and their result.
*yycdebug_ << "Reducing stack by rule " << yyrule - 1
- << " (line " << yylno << "):" << std::endl;
- /* The symbols being reduced. */
+ << " (line " << yylno << "):" << std::endl;
+ // The symbols being reduced.
for (int yyi = 0; yyi < yynrhs; yyi++)
YY_SYMBOL_PRINT (" $" << yyi + 1 << " =",
]b4_rhs_data(yynrhs, yyi + 1)[);
}
-#endif // YYDEBUG
+#endif // ]b4_api_PREFIX[DEBUG
-]b4_lex_symbol_if([], [b4_yytranslate_define])[
+]b4_token_ctor_if([], [b4_yytranslate_define])[
]b4_namespace_close[
]b4_epilogue[]dnl
-m4_divert_pop(0)
+b4_output_end()
+
+
m4_popdef([b4_copyright_years])dnl
projects / bison.git / blobdiff