# C++ skeleton for Bison
-# Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008
-# 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
m4_include(b4_pkgdatadir/[c++.m4])
-# b4_table_define(TABLE-NAME, CONTENT)
-# ------------------------------------
-# Define "parser::yy<TABLE-NAME>_" which contents is CONTENT.
-m4_define([b4_table_define],
-[const b4_int_type_for([$2])
+
+# 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
+ };dnl
])
+
# b4_symbol_value_template(VAL, [TYPE])
# -------------------------------------
-# Same as b4_symbol_value, but used in a template method.
+# Same as b4_symbol_value, but used in a template method. It makes
+# a difference when using variants.
m4_copy([b4_symbol_value], [b4_symbol_value_template])
-# How the semantic value is extracted when using variants.
-b4_variant_if([
- # b4_symbol_value(VAL, [TYPE])
- # ----------------------------
- m4_define([b4_symbol_value],
- [m4_ifval([$2],
- [$1.as<$2>()],
- [$1])])
-
- # b4_symbol_value_template(VAL, [TYPE])
- # -------------------------------------
- # Same as b4_symbol_value, but used in a template method.
- m4_define([b4_symbol_value_template],
- [m4_ifval([$2],
- [$1.template as<$2>()],
- [$1])])
-]) # b4_variant_if
-
-
-# b4_assert_if([IF-ASSERTIONS-ARE-USED], [IF-NOT])
-# ------------------------------------------------
-m4_define([b4_assert_if],
-[b4_percent_define_ifdef([[assert]], [$1], [$2])])
-
# b4_lhs_value([TYPE])
# --------------------
# Expansion of $<TYPE>$.
m4_define([b4_lhs_value],
-[b4_symbol_value([yylhs.value], [$1])])
+ [b4_symbol_value([yylhs.value], [$1])])
# b4_lhs_location()
# -----------------
# Expansion of @$.
m4_define([b4_lhs_location],
-[yylhs.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_@{($1) - ($2)@}])
+ [yystack_@{b4_subtract($@)@}])
# 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]).location])
-# b4_symbol_actions(FILENAME, LINENO,
-# SYMBOL-TAG, SYMBOL-NUM,
-# SYMBOL-ACTION, SYMBOL-TYPENAME)
-# -------------------------------------------------
+# 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_actions],
-[m4_pushdef([b4_dollar_dollar],
- [b4_symbol_value_template([yysym.value], [$6])])dnl
-m4_pushdef([b4_at_dollar], [yysym.location])dnl
- case $4: // $3
-b4_syncline([$2], [$1])
- $5;
+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_at_dollar])dnl
-m4_popdef([b4_dollar_dollar])dnl
-])
-
-# b4_symbol_action_(SYMBOL-TAG, SYMBOL-NUM, SYMBOL-TYPENAME)
-# ----------------------------------------------------------
-# Invoke b4_dollar_dollar(SYMBOL_TYPENAME) for each symbol.
-m4_define([b4_symbol_action_],
-[m4_ifval($3,
-[ case $2: // $1
- b4_dollar_dollar($@);
- break;
+m4_popdef([b4_symbol_value])[]dnl
+b4_dollar_popdef[]dnl
])])
-# b4_symbol_variant(YYTYPE, YYVAL, ACTION, [ARGS])
-# ------------------------------------------------
-# Run some ACTION ("build", or "destroy") on YYVAL of symbol type
-# YYTYPE.
-m4_define([b4_symbol_variant],
-[m4_pushdef([b4_dollar_dollar],
- [$2.$3<$][3>(m4_shift3($@))])dnl
- switch ($1)
- {
-m4_map([b4_symbol_action_], m4_defn([b4_type_names]))
- default:
- break;
- }
-m4_popdef([b4_dollar_dollar])dnl
-])
-
-
-# _b4_char_sizeof_counter
-# -----------------------
-# A counter used by _b4_char_sizeof_dummy to create fresh symbols.
-m4_define([_b4_char_sizeof_counter],
-[0])
-
-# _b4_char_sizeof_dummy
-# ---------------------
-# At each call return a new C++ identifier.
-m4_define([_b4_char_sizeof_dummy],
-[m4_define([_b4_char_sizeof_counter], m4_incr(_b4_char_sizeof_counter))dnl
-dummy[]_b4_char_sizeof_counter])
-
-
-# b4_char_sizeof(SYMBOL-TAG, SYMBOL-NUM, SYMBOL-TYPENAME)
-# -------------------------------------------------------
-# To be mapped on the list of type names to produce:
-#
-# char dummy1[sizeof(type_name_1)];
-# char dummy2[sizeof(type_name_2)];
-#
-# for defined type names.
-# $3 is doubly-quoted, do not quote it again.
-m4_define([b4_char_sizeof],
-[m4_ifval($3,
-[
- char _b4_char_sizeof_dummy@{sizeof($3)@}; // $1])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])
+ [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]])])
-
-# Backward compatibility.
-m4_define([b4_location_constructors])
-m4_include(b4_pkgdatadir/[location.cc])
-
-# We do want M4 expansion after # for CPP macros.
-m4_changecom()
-m4_divert_push(0)dnl
-b4_defines_if(
-[@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_assert_if([#include <cassert>])[
-#include <string>
-#include <iostream>
-#include "stack.hh"
+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
+# ----------------------
+# 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[
- class position;
- class location;
-]b4_variant_if(
-[[
- /// A char[S] buffer to store and retrieve objects.
- ///
- /// Sort of a variant, but does not keep track of the nature
- /// of the stored data, since that knowledge is available
- /// via the current state.
- template <size_t S>
- struct variant
- {]b4_assert_if([
- /// Whether something is contained.
- bool built;
-
- /// Initially uninitialized.
- variant ()
- : built(false)
- {}])[
-
- /// Instantiate a \a T in here.
- template <typename T>
- inline T&
- build()
- {]b4_assert_if([
- assert(!built);
- built = true;])[
- return *new (buffer) T;
- }
- /// Accessor to a built \a T.
- template <typename T>
- inline T&
- as()
- {]b4_assert_if([
- assert(built);])[
- return reinterpret_cast<T&>(buffer);
- }
-
- /// Const accessor to a built \a T (for %printer).
- template <typename T>
- inline const T&
- as() const
- {]b4_assert_if([
- assert(built);])[
- return reinterpret_cast<const T&>(buffer);
- }
+]b4_defines_if([],
+[b4_stack_define
+b4_bison_locations_if([b4_position_define
+b4_location_define])])[
- /// Swap the content with \a other.
- template <typename T>
- inline void
- swap(variant<S>& other)
- {
- std::swap(as<T>(), other.as<T>());
- }
-
- /// Assign the content of \a other to this.
- /// Destroys \a other.
- template <typename T>
- inline void
- build(variant<S>& other)
- {
- build<T>();
- swap<T>(other);
- other.destroy<T>();
- }
-
- /// Destroy the stored \a T.
- template <typename T>
- inline void
- destroy()
- {
- as<T>().~T();]b4_assert_if([
- built = false;])[
- }
-
- /// A buffer large enough to store any of the semantic values.
- char buffer[S];
- };
-]])[
-]b4_namespace_close[
-
-#include "location.hh"
-
-/* Enabling traces. */
-#ifndef YYDEBUG
-# define YYDEBUG ]b4_debug_flag[
-#endif
-
-/* Enabling verbose error messages. */
-#ifdef YYERROR_VERBOSE
-# undef YYERROR_VERBOSE
-# define YYERROR_VERBOSE 1
-#else
-# define YYERROR_VERBOSE ]b4_error_verbose_flag[
-#endif
-
-/* Enabling the token table. */
-#ifndef YYTOKEN_TABLE
-# define YYTOKEN_TABLE ]b4_token_table[
-#endif
-
-/* 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[
{
public:
-#ifndef YYSTYPE
-]b4_variant_if(
-[ /// An auxiliary type to compute the largest semantic type.
- union union_type
- {]m4_map([b4_char_sizeof], m4_defn([b4_type_names]))[
- };
-
- /// Symbol semantic values.
- typedef variant<sizeof(union_type)> semantic_type;],
-[ /// Symbol semantic values.
-m4_ifdef([b4_stype],
-[ union semantic_type
- {b4_user_stype
- };],
-[m4_if(b4_tag_seen_flag, 0,
-[[ typedef int semantic_type;]],
-[[ typedef YYSTYPE semantic_type;]])])])[
-#else
- typedef YYSTYPE semantic_type;
-#endif
- /// Symbol locations.
- typedef ]b4_percent_define_get([[location_type]])[ location_type;
- /// Tokens.
- struct token
- {
- ]b4_token_enums(b4_tokens)[
- };
- /// Token type.
- typedef token::yytokentype token_type;
-
+]b4_public_types_declare[
/// Build a parser object.
]b4_parser_class_name[ (]b4_parse_param_decl[);
virtual ~]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
- private:
- /// Report a syntax error.
- /// \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 (const location_type& loc, const std::string& msg);
+ virtual void error (]b4_locations_if([[const location_type& loc, ]])[const std::string& msg);
- /// Generate an error message.
- /// \param state the state where the error occurred.
- /// \param tok the lookahead token.
- virtual std::string yysyntax_error_ (int yystate, int tok);
+ /// Report a syntax error.
+ void error (const syntax_error& err);
+ private:
/// State numbers.
typedef int state_type;
- /// Internal symbol numbers.
- typedef ]b4_int_type_for([b4_translate])[ token_number_type;
- /* Tables. */
- /// For a state, the index in \a yytable_ of its portion.
- static const ]b4_int_type_for([b4_pact])[ yypact_[];
- static const ]b4_int_type(b4_pact_ninf, b4_pact_ninf)[ yypact_ninf_;
+ /// Generate an error message.
+ /// \param yystate the state where the error occurred.
+ /// \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 yylhs the nonterminal to push on the stack
+ state_type yy_lr_goto_state_ (state_type yystate, int yylhs);
- /// For a state, default rule to reduce.
- /// Unless\a yytable_ specifies something else to do.
- /// Zero means the default is an error.
- static const ]b4_int_type_for([b4_defact])[ yydefact_[];
+ /// 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);
- static const ]b4_int_type_for([b4_pgoto])[ yypgoto_[];
- static const ]b4_int_type_for([b4_defgoto])[ yydefgoto_[];
+ /// 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);
- /// What to do in a state.
- /// \a yytable_[yypact_[s]]: what to do in state \a s.
- /// - if positive, shift that token.
- /// - if negative, reduce the rule which number is the opposite.
- /// - if zero, do what YYDEFACT says.
- static const ]b4_int_type_for([b4_table])[ yytable_[];
+ 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_;
- static const ]b4_int_type_for([b4_check])[ yycheck_[];
+ /// Convert a scanner token number \a t to a symbol number.
+ static token_number_type yytranslate_ (]b4_token_ctor_if([token_type], [int])[ t);
- /// For a state, its accessing symbol.
- static const ]b4_int_type_for([b4_stos])[ yystos_[];
+ // Tables.
+]b4_parser_tables_declare[]b4_error_verbose_if([
- /// For a rule, its LHS.
- static const ]b4_int_type_for([b4_r1])[ yyr1_[];
- /// For a rule, its RHS length.
- static const ]b4_int_type_for([b4_r2])[ yyr2_[];
+ /// Convert the symbol name \a n to a form suitable for a diagnostic.
+ static std::string yytnamerr_ (const char *n);])[
-#if YYDEBUG || YYERROR_VERBOSE || YYTOKEN_TABLE
+]b4_token_table_if([], [[#if ]b4_api_PREFIX[DEBUG]])[
/// For a symbol, its name in clear.
static const char* const yytname_[];
-#endif
-
-#if YYERROR_VERBOSE
- /// Convert the symbol name \a n to a form suitable for a diagnostic.
- virtual std::string yytnamerr_ (const char *n);
-#endif
-
-#if YYDEBUG
- /// For each rule, its source line number.
- static const ]b4_int_type_for([b4_rline])[ yyrline_[];
- /// For each scanner token number, its symbol number.
- static const ]b4_int_type_for([b4_toknum])[ yytoken_number_[];
+]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. */
+ // Debugging.
int yydebug_;
std::ostream* yycdebug_;
-#endif
- /// Convert a scanner token number \a t to a symbol number.
- token_number_type yytranslate_ (int t);
-
- /// A complete symbol, with its type.
- template <typename Exact>
- struct symbol_base_type
- {
- /// Default constructor.
- inline symbol_base_type ();
-
- /// Constructor.
- inline symbol_base_type (const semantic_type& v, const location_type& l);
-
- /// Return this with its exact type.
- const Exact& self () const;
- Exact& self ();
-
- /// Return the type of this symbol.
- int type_get () const;
-
- /// The semantic value.
- semantic_type value;
-
- /// The location.
- location_type location;
- };
-
-#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;
- /// Element of the stack: a state and its attributes.
- struct symbol_type : symbol_base_type<symbol_type>
+ private:
+ /// Type access provider for state based symbols.
+ struct by_state
{
- /// The parent class.
- typedef symbol_base_type<symbol_type> super_type;
-
/// Default constructor.
- inline symbol_type ();
+ by_state ();
- /// Constructor.
- inline symbol_type (int t,
- const semantic_type& v, const location_type& l);
+ /// The symbol type as needed by the constructor.
+ typedef state_type kind_type;
- /// The symbol type.
- int type;
+ /// Constructor.
+ by_state (kind_type s);
- /// Return the type corresponding to this state.
- inline int type_get_ () const;
- };
+ /// Copy constructor.
+ by_state (const by_state& other);
- /// Element of the stack: a state and its attributes.
- struct stack_symbol_type : symbol_base_type<stack_symbol_type>
- {
- /// The parent class.
- typedef symbol_base_type<stack_symbol_type> super_type;
+ /// Steal the symbol type from \a that.
+ void move (by_state& that);
- /// Default constructor.
- inline stack_symbol_type ();
+ /// The (internal) type number (corresponding to \a state).
+ /// "empty" when empty.
+ symbol_number_type type_get () const;
- /// Constructor.
- inline stack_symbol_type (state_type s,
- const semantic_type& v, const location_type& l);
+ 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);
-
- /* Constants. */
- static const int yyeof_;
- /* LAST_ -- Last index in TABLE_. */
- static const int yylast_;
- static const int yynnts_;
- static const int yyempty_;
- static const int yyfinal_;
- static const int yyterror_;
- static const int yyerrcode_;
- static const int yyntokens_;
- static const unsigned int yyuser_token_number_max_;
- static const token_number_type yyundef_token_;
+ void yypop_ (unsigned int n = 1);
+
+ // 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,
+ yyntokens_ = ]b4_tokens_number[ //< Number of tokens.
+ };
+
]b4_parse_param_vars[
};
+]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 */]
-])dnl
-@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. */
-]b4_user_pre_prologue
+// First part of user declarations.
+]b4_user_pre_prologue[
-b4_defines_if([[
-#include "@basename(]b4_spec_defines_file[@)"]])[
+]b4_null_define[
-/* User implementation prologue. */
-]b4_user_post_prologue
-b4_percent_code_get[]dnl
+]b4_defines_if([[#include "@basename(]b4_spec_defines_file[@)"]],
+ [b4_shared_declarations])[
-[#ifndef YY_
-# if YYENABLE_NLS
+// 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 */
+# 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 (yychar = yyempty_)
+#define yyerrok (yyerrstatus_ = 0)
+#define yyclearin (yyempty = true)
-#define YYACCEPT goto yyacceptlab
-#define YYABORT goto yyabortlab
-#define YYERROR goto yyerrorlab
+#define YYACCEPT goto yyacceptlab
+#define YYABORT goto yyabortlab
+#define YYERROR goto yyerrorlab
#define YYRECOVERING() (!!yyerrstatus_)
-]b4_namespace_open[
-#if YYERROR_VERBOSE
+]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
case '\\':
if (*++yyp != '\\')
goto do_not_strip_quotes;
- /* Fall through. */
+ // Fall through.
default:
yyr += *yyp;
break;
return yystr;
}
-
-#endif
+]])[
/// 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. |
`---------------*/
- // symbol_base_type.
- template <typename Exact>
- ]b4_parser_class_name[::symbol_base_type<Exact>::symbol_base_type ()
- : value()
- , location()
- {
- }
+]b4_token_ctor_if([], [b4_public_types_define])[
- template <typename Exact>
- ]b4_parser_class_name[::symbol_base_type<Exact>::symbol_base_type (const semantic_type& v, const location_type& l)
- : value(v)
- , location(l)
- {
- }
+ // by_state.
+ inline
+ ]b4_parser_class_name[::by_state::by_state ()
+ : state (empty)
+ {}
- template <typename Exact>
- const Exact&
- ]b4_parser_class_name[::symbol_base_type<Exact>::self () const
- {
- return static_cast<const Exact&>(*this);
- }
+ inline
+ ]b4_parser_class_name[::by_state::by_state (const by_state& other)
+ : state (other.state)
+ {}
- template <typename Exact>
- Exact&
- ]b4_parser_class_name[::symbol_base_type<Exact>::self ()
+ inline
+ void
+ ]b4_parser_class_name[::by_state::move (by_state& that)
{
- return static_cast<Exact&>(*this);
+ state = that.state;
+ that.state = empty;
}
- template <typename Exact>
- int
- ]b4_parser_class_name[::symbol_base_type<Exact>::type_get () const
- {
- return self ().type_get_ ();
- }
+ inline
+ ]b4_parser_class_name[::by_state::by_state (state_type s)
+ : state (s)
+ {}
- // symbol_type.
- ]b4_parser_class_name[::symbol_type::symbol_type ()
- : super_type ()
- , type ()
+ inline
+ ]b4_parser_class_name[::symbol_number_type
+ ]b4_parser_class_name[::by_state::type_get () const
{
+ return state == empty ? 0 : yystos_[state];
}
- ]b4_parser_class_name[::symbol_type::symbol_type (int t,
- const semantic_type& v, const location_type& l)
- : super_type (v, l)
- , type (t)
- {
- }
-
- int
- ]b4_parser_class_name[::symbol_type::type_get_ () const
- {
- return type;
- }
-
- // stack_symbol_type.
+ inline
]b4_parser_class_name[::stack_symbol_type::stack_symbol_type ()
- : super_type ()
- , state ()
- {
- }
+ {}
- ]b4_parser_class_name[::stack_symbol_type::stack_symbol_type (state_type s,
- const semantic_type& v, const location_type& l)
- : super_type (v, l)
- , state (s)
+
+ 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;
}
- int
- ]b4_parser_class_name[::stack_symbol_type::type_get_ () const
+ 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)
{
- ]m4_map([b4_symbol_actions], m4_defn([b4_symbol_destructors]))[
- default:
- break;
- }]b4_variant_if([
-
- // Type destructor.
- b4_symbol_variant([[yytype]], [[yysym.value]], [[template destroy]])])[
+]b4_symbol_foreach([b4_symbol_destructor])dnl
+[ default:
+ break;
+ }])[
}
-#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] << " ("
- << yysym.location << ": ";
+ << ' ' << yytname_[yytype] << " ("]b4_locations_if([
+ << yysym.location << ": "])[;
switch (yytype)
{
- ]m4_map([b4_symbol_actions], m4_defn([b4_symbol_printers]))dnl
+]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 (s, semantic_type(), sym.location));
- ]b4_symbol_variant([[yystos_[s]]], [[yystack_[0].value]],
- [build], [sym.value])],
-[ yystack_.push (stack_symbol_type (s, sym.value, 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 (s.state, semantic_type(), 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)
+ {
+ int yyr = yypgoto_[yylhs - yyntokens_] + yystate;
+ if (0 <= yyr && yyr <= yylast_ && yycheck_[yyr] == yystate)
+ return yytable_[yyr];
+ else
+ return yydefgoto_[yylhs - yyntokens_];
+ }
+
+ inline bool
+ ]b4_parser_class_name[::yy_pact_value_is_default_ (int yyvalue)
+ {
+ return yyvalue == yypact_ninf_;
+ }
+
+ inline bool
+ ]b4_parser_class_name[::yy_table_value_is_error_ (int yyvalue)
+ {
+ return yyvalue == yytable_ninf_;
+ }
int
]b4_parser_class_name[::parse ()
{
- /// Coded type of the lookahead.
- int yychar = yyempty_;
+ /// Whether yyla contains a lookahead.
+ bool yyempty = true;
- /* State. */
+ // State.
int yyn;
int yylen = 0;
- int yystate = 0;
- /* Error handling. */
+ // Error handling.
int yynerrs_ = 0;
int yyerrstatus_ = 0;
/// The lookahead symbol.
- symbol_type yyla;
+ 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 state was pushed on the stack.
- // Invariant: yystate == yystack_[0].state, i.e.,
- // yystate was just pushed onto the state stack.
+ // A new symbol was pushed on the stack.
yynewstate:
- YYCDEBUG << "Entering state " << yystate << std::endl;
+ YYCDEBUG << "Entering state " << yystack_[0].state << std::endl;
- /* Accept? */
- if (yystate == yyfinal_)
+ // Accept?
+ if (yystack_[0].state == yyfinal_)
goto yyacceptlab;
goto yybackup;
- /* Backup. */
+ // Backup.
yybackup:
- /* Try to take a decision without lookahead. */
- yyn = yypact_[yystate];
- if (yyn == yypact_ninf_)
+ // 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 (yychar == yyempty_)
- {
- YYCDEBUG << "Reading a token: ";
- yychar = ]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))[;
- }
-
-
- /* Convert token to internal form. */
- if (yychar <= yyeof_)
+ // Read a lookahead token.
+ if (yyempty)
{
- yychar = yyla.type = yyeof_;
- YYCDEBUG << "Now at end of input." << std::endl;
- }
- else
- {
- yyla.type = yytranslate_ (yychar);
- YY_SYMBOL_PRINT ("Next token is", yyla);
+ YYCDEBUG << "Reading a token: ";
+ 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 (yyn == 0 || yyn == yytable_ninf_)
- goto yyerrlab;
- yyn = -yyn;
- goto yyreduce;
+ if (yy_table_value_is_error_ (yyn))
+ goto yyerrlab;
+ yyn = -yyn;
+ goto yyreduce;
}
- /* Discard the token being shifted. */
- yychar = yyempty_;
+ // 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. */
- yystate = yyn;
- yypush_ ("Shifting", yystate, yyla);
+ // Shift the lookahead token.
+ yypush_ ("Shifting", yyn, yyla);
goto yynewstate;
/*-----------------------------------------------------------.
| yydefault -- do the default action for the current state. |
`-----------------------------------------------------------*/
yydefault:
- yyn = yydefact_[yystate];
+ yyn = yydefact_[yystack_[0].state];
if (yyn == 0)
goto yyerrlab;
goto yyreduce;
| yyreduce -- Do a reduction. |
`-----------------------------*/
yyreduce:
- yylen = yyr2_[yyn];]b4_variant_if([
+ 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 rule is NOT applied when using
- variants */
- ]b4_symbol_variant([[yyr1_@{yyn@}]], [yylhs.value], [build])[],[
+ correct type. The default $$=$1 action is NOT applied when using
+ variants. */
+ b4_symbol_variant([[yyr1_@{yyn@}]], [yylhs.value], [build])],[
/* If YYLEN is nonzero, implement the default value of the action:
`$$ = $1'. Otherwise, use the top of the stack.
yylhs.value = yystack_@{yylen - 1@}.value;
else
yylhs.value = yystack_@{0@}.value;])[
-
+]b4_locations_if([dnl
+[
// Compute the default @@$.
{
slice<stack_symbol_type, stack_type> slice (yystack_, yylen);
YYLLOC_DEFAULT (yylhs.location, slice, yylen);
- }
+ }]])[
// Perform the reduction.
YY_REDUCE_PRINT (yyn);
- switch (yyn)
+ try
{
- ]b4_user_actions[
- default:
- break;
+ switch (yyn)
+ {
+]b4_user_actions[
+ default:
+ break;
+ }
+ }
+ catch (const syntax_error& yyexc)
+ {
+ error (yyexc);
+ YYERROR;
}
- // Compute post-reduction state.
- yyn = yyr1_[yyn];
- yystate = yypgoto_[yyn - yyntokens_] + yystack_[yylen].state;
- if (0 <= yystate && yystate <= yylast_
- && yycheck_[yystate] == yystack_[yylen].state)
- yystate = yytable_[yystate];
- else
- yystate = yydefgoto_[yyn - yyntokens_];
- yylhs.state = yystate;
YY_SYMBOL_PRINT ("-> $$ =", yylhs);
-]b4_variant_if([[
- // Destroy the lhs symbols.
- for (int i = 0; i < yylen; ++i)
- // Destroy a variant which value may have be swapped with
- // yylhs.value. The value of yylhs.value (hence maybe one of
- // these lhs symbols) depends on what does the default
- // contruction for this type. In the case of pointers for
- // instance, nothing is done, so the value is junk. Therefore
- // do not try to report the content in the debug trace, it's
- // 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 -- 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 (yyla.location, yysyntax_error_ (yystate, yyla.type));
+ ++yynerrs_;
+ error (]b4_join(b4_locations_if([yyla.location]),
+ [[yysyntax_error_ (yystack_[0].state,
+ yyempty ? yyempty_ : yyla.type_get ())]])[);
}
- yyerror_range[0].location = yyla.location;
+]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. */
-
- if (yychar <= yyeof_)
- {
- /* Return failure if at end of input. */
- if (yychar == yyeof_)
- YYABORT;
- }
- else
- {
- yy_destroy_ ("Error: discarding", yyla);
- yychar = yyempty_;
- }
+ /* 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 (!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;
YYERROR and the label yyerrorlab therefore never appears in user
code. */
if (false)
- goto yyerrorlab;
-
- yyerror_range[0].location = yystack_[yylen - 1].location;
- /* Do not reclaim the symbols of the rule which action triggered
+ 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();]])[
+ /* Do not reclaim the symbols of the rule whose action triggered
this YYERROR. */
yypop_ (yylen);
yylen = 0;
- yystate = yystack_[0].state;
goto yyerrlab1;
/*-------------------------------------------------------------.
| 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 (;;)
{
- yyn = yypact_[yystate];
- if (yyn != yypact_ninf_)
+ yyn = yypact_[yystack_[0].state];
+ if (!yy_pact_value_is_default_ (yyn))
{
yyn += yyterror_;
if (0 <= yyn && yyn <= yylast_ && yycheck_[yyn] == yyterror_)
// Pop the current state because it cannot handle the error token.
if (yystack_.size () == 1)
YYABORT;
-
- yyerror_range[0].location = yystack_[0].location;
+]b4_locations_if([[
+ yyerror_range[1].location = yystack_[0].location;]])[
yy_destroy_ ("Error: popping", yystack_[0]);
yypop_ ();
- yystate = yystack_[0].state;
YY_STACK_PRINT ();
}
+]b4_locations_if([[
+ yyerror_range[2].location = yyla.location;
+ YYLLOC_DEFAULT (error_token.location, yyerror_range, 2);]])[
- yyerror_range[1].location = yyla.location;
- YYLLOC_DEFAULT (error_token.location, (yyerror_range - 1), 2);
-
- /* Shift the error token. */
- error_token.state = yystate = yyn;
+ // 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;
yyreturn:
- if (yychar != yyempty_)
+ 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_ (int yystate, int]dnl
-b4_error_verbose_if([ tok])[)
- {
- std::string res;
- YYUSE (yystate);
-#if YYERROR_VERBOSE
- int yyn = yypact_[yystate];
- if (yypact_ninf_ < yyn && yyn <= yylast_)
+ ]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([[
+ 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. */
- 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_)
- ++count;
-
- // FIXME: This method of building the message is not compatible
- // with internationalization. It should work like yacc.c does it.
- // That is, first build a string that looks like this:
- // "syntax error, unexpected %s or %s or %s"
- // Then, invoke YY_ on this string.
- // Finally, use the string as a format to output
- // yytname_[tok], etc.
- // Until this gets fixed, this message appears in English only.
- res = "syntax error, unexpected ";
- res += yytnamerr_ (yytname_[tok]);
- if (count < 5)
- {
- count = 0;
- for (int x = yyxbegin; x < yyxend; ++x)
- if (yycheck_[x + yyn] == x && x != yyterror_)
- {
- res += (!count++) ? ", expecting " : " or ";
- res += yytnamerr_ (yytname_[x]);
- }
- }
+ yyarg[yycount++] = yytname_[yytoken];
+ 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_;
+ 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];
+ }
+ }
}
- else
-#endif
- res = YY_("syntax error");
- return res;
- }
+ 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_
+ }
- /* YYPACT[STATE-NUM] -- Index in YYTABLE of the portion describing
- STATE-NUM. */
- const ]b4_int_type(b4_pact_ninf, b4_pact_ninf) b4_parser_class_name::yypact_ninf_ = b4_pact_ninf[;
- ]b4_table_define([pact], [b4_pact])[;
-
- /* YYDEFACT[S] -- default rule to reduce with in state S when YYTABLE
- doesn't specify something else to do. Zero means the default is an
- error. */
- ]b4_table_define([defact], [b4_defact])[;
+ // 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");]])[
+ }
- /* YYPGOTO[NTERM-NUM]. */
- ]b4_table_define([pgoto], [b4_pgoto])[;
- /* YYDEFGOTO[NTERM-NUM]. */
- ]b4_table_define([defgoto], [b4_defgoto])[;
+ const ]b4_int_type(b4_pact_ninf, b4_pact_ninf) b4_parser_class_name::yypact_ninf_ = b4_pact_ninf[;
- /* YYTABLE[YYPACT[STATE-NUM]]. What to do in state STATE-NUM. If
- positive, shift that token. If negative, reduce the rule which
- number is the opposite. If zero, do what YYDEFACT says. */
const ]b4_int_type(b4_table_ninf, b4_table_ninf) b4_parser_class_name::yytable_ninf_ = b4_table_ninf[;
- ]b4_table_define([table], [b4_table])[;
-
- /* YYCHECK. */
- ]b4_table_define([check], [b4_check])[;
- /* STOS_[STATE-NUM] -- The (internal number of the) accessing
- symbol of state STATE-NUM. */
- ]b4_table_define([stos], [b4_stos])[;
-
-#if YYDEBUG
- /* TOKEN_NUMBER_[YYLEX-NUM] -- Internal symbol number corresponding
- to YYLEX-NUM. */
- ]b4_table_define([token_number], [b4_toknum])[;
-#endif
+]b4_parser_tables_define[
- /* YYR1[YYN] -- Symbol number of symbol that rule YYN derives. */
- ]b4_table_define([r1], [b4_r1])[;
-
- /* YYR2[YYN] -- Number of symbols composing right hand side of rule YYN. */
- ]b4_table_define([r2], [b4_r2])[;
-
-#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
- /* YYRLINE[YYN] -- Source line where rule number YYN was defined. */
- ]b4_table_define([rline], [b4_rline])[;
+]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.
void
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
-
- /* YYTRANSLATE(YYLEX) -- Bison symbol number corresponding to YYLEX. */
- ]b4_parser_class_name[::token_number_type
- ]b4_parser_class_name[::yytranslate_ (int t)
- {
- static
- const token_number_type
- translate_table[] =
- {
- ]b4_translate[
- };
- if ((unsigned int) t <= yyuser_token_number_max_)
- return translate_table[t];
- else
- return yyundef_token_;
- }
-
- const int ]b4_parser_class_name[::yyeof_ = 0;
- const int ]b4_parser_class_name[::yylast_ = ]b4_last[;
- const int ]b4_parser_class_name[::yynnts_ = ]b4_nterms_number[;
- const int ]b4_parser_class_name[::yyempty_ = -2;
- const int ]b4_parser_class_name[::yyfinal_ = ]b4_final_state_number[;
- const int ]b4_parser_class_name[::yyterror_ = 1;
- const int ]b4_parser_class_name[::yyerrcode_ = 256;
- const int ]b4_parser_class_name[::yyntokens_ = ]b4_tokens_number[;
-
- const unsigned int ]b4_parser_class_name[::yyuser_token_number_max_ = ]b4_user_token_number_max[;
- const ]b4_parser_class_name[::token_number_type ]b4_parser_class_name[::yyundef_token_ = ]b4_undef_token_number[;
+#endif // ]b4_api_PREFIX[DEBUG
+]b4_token_ctor_if([], [b4_yytranslate_define])[
]b4_namespace_close[
-
]b4_epilogue[]dnl
-@output(b4_dir_prefix[]stack.hh@)@
-b4_copyright([Stack handling for Bison parsers in C++])[
-
-#ifndef BISON_STACK_HH
-# define BISON_STACK_HH
-
-#include <deque>
-
-]b4_namespace_open[
- template <class T, class S = std::deque<T> >
- class stack
- {
- public:
-
- // Hide our reversed order.
- typedef typename S::reverse_iterator iterator;
- typedef typename S::const_reverse_iterator const_iterator;
-
- stack () : seq_ ()
- {
- }
-
- stack (unsigned int n) : seq_ (n)
- {
- }
-
- inline
- T&
- operator [] (unsigned int i)
- {
- return seq_[i];
- }
-
- inline
- const T&
- operator [] (unsigned int i) const
- {
- return seq_[i];
- }
-
- inline
- void
- push (const T& t)
- {
- seq_.push_front (t);
- }
-
- inline
- void
- pop (unsigned int n = 1)
- {
- for (; n; --n)
- seq_.pop_front ();
- }
-
- inline
- typename S::size_type
- size () const
- {
- return seq_.size ();
- }
-
- inline const_iterator begin () const { return seq_.rbegin (); }
- inline const_iterator end () const { return seq_.rend (); }
+b4_output_end()
- private:
- /// The wrapped container.
- S seq_;
- };
-
- /// Present a slice of the top of a stack.
- template <class T, class S = stack<T> >
- class slice
- {
- public:
-
- slice (const S& stack,
- unsigned int range) : stack_ (stack),
- range_ (range)
- {
- }
-
- inline
- const T&
- operator [] (unsigned int i) const
- {
- return stack_[range_ - i];
- }
-
- private:
-
- const S& stack_;
- unsigned int range_;
- };
-]b4_namespace_close[
-#endif // not BISON_STACK_HH[]dnl
-]
-m4_divert_pop(0)
m4_popdef([b4_copyright_years])dnl
projects / bison.git / blobdiff