X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/dd735e4ee62c176761d8128063b0e0027fc239c5..77a1a208a9ff9110f28a958c3fb630b434976e1a:/data/lalr1.cc?ds=sidebyside diff --git a/data/lalr1.cc b/data/lalr1.cc index c2c634cf..75eaf571 100644 --- a/data/lalr1.cc +++ b/data/lalr1.cc @@ -1,7 +1,6 @@ # C++ skeleton for Bison -# Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008 -# Free Software Foundation, Inc. +# Copyright (C) 2002-2012 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 @@ -19,87 +18,46 @@ m4_include(b4_pkgdatadir/[c++.m4]) -# b4_args(ARG1, ...) -# _b4_args(ARG1, ...) -# ------------------- -# Join with comma, skipping empty arguments. -# b4_args calls itself recursively until it sees the first non-empty -# argument, then calls _b4_args which prepends each non-empty argument -# with a comma. -m4_define([b4_args], -[m4_if([$#$1], - [1], [], - [m4_ifval([$1], - [$1[]_$0(m4_shift($@))], - [$0(m4_shift($@))])])]) - -# _b4_args(ARGS1, ...) -# -------------------- -m4_define([_b4_args], -[m4_if([$#$1], - [1], [], - [m4_ifval([$1], [, $1])[]$0(m4_shift($@))])]) - +# b4_integral_parser_table_declare(TABLE-NAME, CONTENT, COMMENT) +# -------------------------------------------------------------- +# Declare "parser::yy_" which 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_table_define(TABLE-NAME, CONTENT) -# ------------------------------------ +# b4_integral_parser_table_define(TABLE-NAME, CONTENT, COMMENT) +# ------------------------------------------------------------- # Define "parser::yy_" which contents is CONTENT. -m4_define([b4_table_define], -[const b4_int_type_for([$2]) +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_lex_symbol_if([IF-YYLEX-RETURNS-A-COMPLETE-SYMBOL], [IF-NOT]) -# ---------------------------------------------------------------- -m4_define([b4_lex_symbol_if], -[b4_percent_define_ifdef([[lex_symbol]], [$1], [$2])]) - - -# 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 $$. 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) @@ -107,11 +65,11 @@ m4_define([b4_lhs_location], # 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], @@ -134,414 +92,73 @@ m4_define([b4_rhs_location], [b4_rhs_data([$1], [$2]).location]) -# b4_symbol(NUM, FIELD) -# --------------------- -# Recover a FIELD about symbol #NUM. Thanks to m4_indir, fails if -# undefined. -m4_define([b4_symbol], -[m4_indir([b4_symbol($1, $2)])]) - - -# b4_symbol_if(NUM, FIELD, IF-TRUE, IF-FALSE) -# ------------------------------------------- -# If FIELD about symbol #NUM is 1 expand IF-TRUE, if is 0, expand IF-FALSE. -# Otherwise an error. -m4_define([b4_symbol_if], -[m4_case(b4_symbol([$1], [$2]), - [1], [$3], - [0], [$4], - [m4_fatal([$0: field $2 of $1 is not a Boolean:] b4_symbol([$1], [$2]))])]) - - -# 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_case_(SYMBOL-NUM) -# --------------------------- -# Issue a "case NUM" for SYMBOL-NUM. -m4_define([b4_symbol_case_], -[ case b4_symbol([$1], [number]): // b4_symbol([$1], [tag]) -]) - - -# b4_type_action_(NUMS) -# --------------------- -# Run actions for the symbol NUMS that all have the same type-name. -# Skip NUMS that have no type-name. -m4_define([b4_type_action_], -[b4_symbol_if([$1], [has_type], -[m4_map([b4_symbol_case_], [$@])[]dnl - b4_dollar_dollar([b4_symbol([$1], [number])], - [b4_symbol([$1], [tag])], - [b4_symbol([$1], [type])]); - break; -])]) - - -# b4_symbol_constructor_declaration_(SYMBOL-NUMBERS) -# ---------------------------------------------------- -# Declare the overloaded version of make_symbol for the (common) type of -# these SYMBOL-NUMBERS. Use at class-level. -m4_define([b4_symbol_constructor_declaration_], -[ template - static inline symbol_type - make_symbol (b4_args(b4_symbol_if([$1], [has_type], - [const b4_symbol([$1], [type])& v]), - b4_locations_if([const location_type& l]))); - -]) - -# b4_symbol_constructor_declarations -# ---------------------------------- -# Declare the overloaded versions of make_symbol for all the value types. -# Use at class-level. -m4_define([b4_symbol_constructor_declarations], -[b4_variant_if([ - // Declaration of make_symbol for each value type. -m4_map([b4_symbol_constructor_declaration_], m4_defn([b4_type_names]))])]) - - - -# b4_symbol_constructor_specialization_(SYMBOL-NUMBER) -# ---------------------------------------------------- -# Declare the specialization of make_symbol for this each SYMBOL-NUMBER. -# Specializations cannot be declared at class-level, this must be done -# at namespace-level. -m4_define([b4_symbol_constructor_specialization_], -[b4_symbol_if([$1], [is_token], [b4_symbol_if([$1], [has_id], -[ template <> - inline - b4_parser_class_name::symbol_type - b4_parser_class_name::make_symbol (dnl -b4_args(b4_symbol_if([$1], [has_type], - [const b4_symbol([$1], [type])& v]), - b4_locations_if([const b4_parser_class_name::location_type& l]))); -])])]) - -# b4_symbol_constructor_specializations -# ------------------------------------- -# Declare specializations of make_symbol. -m4_define([b4_symbol_constructor_specializations], -[b4_variant_if([ - // Specializations of make_symbol for each symbol type. -m4_map([b4_symbol_constructor_specialization_], - m4_defn([b4_symbol_numbers]))])dnl -]) - - - -# b4_symbol_constructor_definition_(SYMBOL-NUMBER) -# ------------------------------------------------ -# Define make_symbol for this SYMBOL-NUMBER. -m4_define([b4_symbol_constructor_definition_], -[b4_symbol_if([$1], [is_token], [b4_symbol_if([$1], [has_id], -[ template <> - b4_parser_class_name::symbol_type - b4_parser_class_name::make_symbol (dnl -b4_args(b4_symbol_if([$1], [has_type], - [const b4_symbol([$1], [type])& v]), - b4_locations_if([const location_type& l]))) - { - return symbol_type (b4_args([yytranslate_ (token::b4_symbol([$1], [id]))], - b4_symbol_if([$1], [has_type], [v]), - b4_locations_if([l]))); - } - -])])]) - - -# b4_symbol_constructor_declarations -# ---------------------------------- -# Define the overloaded versions of make_symbol for all the value types. -m4_define([b4_symbol_constructor_definitions], -[b4_variant_if( -[ // Implementation of make_symbol for each symbol type. -m4_map([b4_symbol_constructor_definition_], m4_defn([b4_symbol_numbers]))])]) - - -# 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_type_action_], m4_defn([b4_type_names]))[]dnl - 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-NUM) -# --------------------------- -# A comment describing this symbol. -m4_define([b4_char_sizeof_], -[ // b4_symbol([$1], [tag]) -]) - -# b4_char_sizeof(SYMBOL-NUMS) -# -------------------------- -# 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. -m4_define([b4_char_sizeof], -[b4_symbol_if([$1], [has_type], -[ -m4_map([b4_char_sizeof_], [$@])dnl - char _b4_char_sizeof_dummy@{sizeof([b4_symbol([$1], [type])])@}; +m4_popdef([b4_symbol_value])[]dnl +b4_dollar_popdef[]dnl ])]) m4_pushdef([b4_copyright_years], - [2002, 2003, 2004, 2005, 2006, 2007, 2008]) + [2002-2012]) 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])]) - -# 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_assert_if([#include ])[ -#include -#include -#include "stack.hh" +b4_locations_if([b4_percent_define_ifdef([[location_type]], [], + [# Backward compatibility. + m4_define([b4_location_constructors]) + m4_include(b4_pkgdatadir/[location.cc])])]) +m4_include(b4_pkgdatadir/[stack.hh]) +b4_variant_if([m4_include(b4_pkgdatadir/[variant.hh])]) + +# 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 ])[ +# include +# include +# include +# include ]b4_defines_if([[ +# include "stack.hh" +]b4_locations_if([b4_percent_define_ifdef([[location_type]], [], + [[# include "location.hh"]])])])[ + +]b4_YYDEBUG_define[ ]b4_namespace_open[ -]b4_locations_if([ 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 - struct variant - {]b4_assert_if([ - /// Whether something is contained. - bool built; -])[ - /// Empty construction. - inline - variant ()]b4_assert_if([ - : built(false)])[ - {} - - /// Instantiate a \a T in here. - template - inline T& - build() - {]b4_assert_if([ - assert(!built); - built = true;])[ - return *new (buffer) T; - } - - /// Instantiate a \a T in here from \a t. - template - inline T& - build(const T& t) - {]b4_assert_if([ - assert(!built); - built = true;])[ - return *new (buffer) T(t); - } - - /// Construct and fill. - template - inline - variant (const T& t)]b4_assert_if([ - : built(true)])[ - { - new (buffer) T(t); - } - - /// Accessor to a built \a T. - template - inline T& - as() - {]b4_assert_if([ - assert(built);])[ - return reinterpret_cast(buffer); - } - - /// Const accessor to a built \a T (for %printer). - template - inline const T& - as() const - {]b4_assert_if([ - assert(built);])[ - return reinterpret_cast(buffer); - } - - /// Swap the content with \a other. - template - inline void - swap(variant& other) - { - std::swap(as(), other.as()); - } - - /// Assign the content of \a other to this. - /// Destroys \a other. - template - inline void - build(variant& other) - { - build(); - swap(other); - other.destroy(); - } - - /// Destroy the stored \a T. - template - inline void - destroy() - { - as().~T();]b4_assert_if([ - built = false;])[ - } - - /// A buffer large enough to store any of the semantic values. - char buffer[S]; - }; -]])[ -]b4_namespace_close[ - -]b4_locations_if([#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 - -]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_defines_if([], +[b4_stack_define +b4_locations_if([b4_percent_define_ifdef([[location_type]], [], + [b4_position_define +b4_location_define])])])[ -]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 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]b4_locations_if([ - /// 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[ (); @@ -550,7 +167,7 @@ m4_ifdef([b4_stype], /// \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. @@ -564,107 +181,67 @@ m4_ifdef([b4_stype], void set_debug_level (debug_level_type l); #endif - private: - /// 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); - /// 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_; - - /// 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_[]; + /// 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); - static const ]b4_int_type_for([b4_pgoto])[ yypgoto_[]; - static const ]b4_int_type_for([b4_defgoto])[ yydefgoto_[]; + /// 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); - /// 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_table_ninf, b4_table_ninf)[ yytable_ninf_; + /// 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_check])[ yycheck_[]; + /// 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); - /// For a state, its accessing symbol. - static const ]b4_int_type_for([b4_stos])[ yystos_[]; + /// 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_; - /// 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_[]; - -#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 - /// 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]])[ + /// 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. */ + // Debugging. int yydebug_; std::ostream* yycdebug_; -#endif +#endif // ]b4_api_PREFIX[DEBUG /// Convert a scanner token number \a t to a symbol number. - static inline token_number_type yytranslate_ (int t); - - /// A complete symbol, with its type. - template - struct symbol_base_type - { - /// Default constructor. - inline symbol_base_type (); - - /// Constructor.]b4_locations_if([ - inline symbol_base_type (const location_type& l)])[; - inline symbol_base_type (]b4_args( - [const semantic_type& v], - b4_locations_if([const location_type& l]))[); - - /// Return this with its exact type. - const Exact& self () const; - Exact& self (); + static inline token_number_type yytranslate_ (]b4_lex_symbol_if([token_type], [int])[ t); - /// Return the type of this symbol. - int type_get () const; - - /// The semantic value. - semantic_type value;]b4_locations_if([ - - /// The location. - location_type location;])[ - }; - -#if YYDEBUG +#if ]b4_api_PREFIX[DEBUG /// \brief Display a symbol type, value and location. /// \param yyo The output stream. /// \param yysym The symbol. @@ -681,33 +258,6 @@ m4_ifdef([b4_stype], inline void yy_destroy_ (const char* yymsg, symbol_base_type& yysym) const; - public: - /// Element of the stack: a state and its attributes. - struct symbol_type : symbol_base_type - { - /// The parent class. - typedef symbol_base_type super_type; - - /// Default constructor. - inline symbol_type (); - - /// Constructor. - inline symbol_type (]b4_args([int t], - [const semantic_type& v], - b4_locations_if([const location_type& l]))[); - - inline symbol_type (]b4_args([int t], - b4_locations_if([const location_type& l]))[); - - /// The symbol type. - int type; - - /// Return the type corresponding to this state. - inline int type_get_ () const; - }; - -]b4_symbol_constructor_declarations[ - private: /// Element of the stack: a state and its attributes. struct stack_symbol_type : symbol_base_type @@ -719,14 +269,14 @@ m4_ifdef([b4_stype], inline stack_symbol_type (); /// Constructor. - inline stack_symbol_type (]b4_args([state_type s], + inline stack_symbol_type (]b4_join([state_type s], [const semantic_type& v], b4_locations_if([const location_type& l]))[); /// The state. state_type state; - /// Return the type corresponding to this state. + /// The type (corresponding to \a state). inline int type_get_ () const; }; @@ -764,25 +314,49 @@ m4_ifdef([b4_stype], 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_symbol_constructor_specializations[ + +]b4_lex_symbol_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 +#ifndef ]b4_api_PREFIX[STYPE /* Redirection for backward compatibility. */ -# define YYSTYPE b4_namespace_ref::b4_parser_class_name::semantic_type +# define ]b4_api_PREFIX[STYPE b4_namespace_ref::b4_parser_class_name::semantic_type #endif +])[ +]b4_percent_code_get([[provides]])[ +]]) + +# We do want M4 expansion after # for CPP macros. +m4_changecom() +b4_defines_if( +[m4_divert_push(0)dnl +@output(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]) +m4_divert_pop(0)dnl ]) -b4_percent_code_get([[provides]])[]dnl -[#endif /* ! defined PARSER_HEADER_H */] + +m4_divert_push(0)dnl @output(b4_parser_file_name@)@ b4_copyright([Skeleton implementation for Bison LALR(1) parsers in C++]) b4_percent_code_get([[top]])[]dnl @@ -791,17 +365,20 @@ 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 +]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 /* FIXME: INFRINGES ON USER NAME SPACE */ # define YY_(msgid) dgettext ("bison-runtime", msgid) @@ -812,11 +389,15 @@ b4_percent_code_get[]dnl # 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 YYDEBUG +#if ]b4_api_PREFIX[DEBUG /* A pseudo ostream that takes yydebug_ into account. */ # define YYCDEBUG if (yydebug_) (*yycdebug_) @@ -831,26 +412,26 @@ b4_percent_code_get[]dnl } \ } 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(0) +# define YY_SYMBOL_PRINT(Title, Symbol) YYUSE(Symbol) # define YY_REDUCE_PRINT(Rule) static_cast(0) # define YY_STACK_PRINT() static_cast(0) -#endif /* !YYDEBUG */ +#endif /* !]b4_api_PREFIX[DEBUG */ #define yyerrok (yyerrstatus_ = 0) #define yyclearin (yyempty = true) @@ -903,7 +484,7 @@ b4_percent_code_get[]dnl /// 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[ @@ -919,82 +500,7 @@ b4_percent_code_get[]dnl | Symbol types. | `---------------*/ - // symbol_base_type. - template - ]b4_parser_class_name[::symbol_base_type::symbol_base_type () - : value()]b4_locations_if([ - , location()])[ - { - }]b4_locations_if([[ - - template - ]b4_parser_class_name[::symbol_base_type::symbol_base_type (const location_type& l) - : value() - , location(l) - { - }]])[ - - template - ]b4_parser_class_name[::symbol_base_type::symbol_base_type (]b4_args( - [const semantic_type& v], - b4_locations_if([const location_type& l]))[) - : value(v)]b4_locations_if([ - , location(l)])[ - { - } - - template - const Exact& - ]b4_parser_class_name[::symbol_base_type::self () const - { - return static_cast(*this); - } - - template - Exact& - ]b4_parser_class_name[::symbol_base_type::self () - { - return static_cast(*this); - } - - template - int - ]b4_parser_class_name[::symbol_base_type::type_get () const - { - return self ().type_get_ (); - } - - // symbol_type. - ]b4_parser_class_name[::symbol_type::symbol_type () - : super_type () - , type () - { - } - - ]b4_parser_class_name[::symbol_type::symbol_type (]b4_args( - [int t], - b4_locations_if([const location_type& l]))[) - : super_type (]b4_locations_if([l])[) - , type (t) - { - } - - ]b4_parser_class_name[::symbol_type::symbol_type (]b4_args( - [int t], - [const semantic_type& v], - b4_locations_if([const location_type& l]))[) - : super_type (v]b4_locations_if([, l])[) - , type (t) - { - } - - int - ]b4_parser_class_name[::symbol_type::type_get_ () const - { - return type; - } - -]b4_symbol_constructor_definitions[ +]b4_lex_symbol_if([], [b4_public_types_define])[ // stack_symbol_type. ]b4_parser_class_name[::stack_symbol_type::stack_symbol_type () @@ -1003,7 +509,7 @@ b4_percent_code_get[]dnl { } - ]b4_parser_class_name[::stack_symbol_type::stack_symbol_type (]b4_args( + ]b4_parser_class_name[::stack_symbol_type::stack_symbol_type (]b4_join( [state_type s], [const semantic_type& v], b4_locations_if([const location_type& l]))[) @@ -1024,38 +530,39 @@ b4_percent_code_get[]dnl ]b4_parser_class_name[::yy_destroy_ (const char* yymsg, symbol_base_type& yysym) const { - int yytype = yysym.type_get (); - YYUSE (yymsg); if (yymsg) YY_SYMBOL_PRINT (yymsg, yysym); // User destructor. + int yytype = yysym.type_get (); switch (yytype) { -]m4_map([b4_symbol_actions], m4_defn([b4_symbol_destructors]))[ - default: - break; +]b4_symbol_foreach([b4_symbol_destructor])dnl +[ default: + break; }]b4_variant_if([ // Type destructor. b4_symbol_variant([[yytype]], [[yysym.value]], [[template destroy]])])[ } -#if YYDEBUG +#if ]b4_api_PREFIX[DEBUG template void ]b4_parser_class_name[::yy_print_ (std::ostream& yyo, const symbol_base_type& yysym) const { + std::ostream& yyoutput = yyo; + YYUSE (yyoutput); int yytype = yysym.type_get (); yyo << (yytype < yyntokens_ ? "token" : "nterm") << ' ' << yytname_[yytype] << " ("]b4_locations_if([ << yysym.location << ": "])[; switch (yytype) { -]m4_map([b4_symbol_actions], m4_defn([b4_symbol_printers]))[ - default: - break; +]b4_symbol_foreach([b4_symbol_printer])dnl +[ default: + break; } yyo << ')'; } @@ -1068,13 +575,13 @@ b4_percent_code_get[]dnl if (m) YY_SYMBOL_PRINT (m, sym); ]b4_variant_if( -[[ yystack_.push (stack_symbol_type (]b4_args( +[[ yystack_.push (stack_symbol_type (]b4_join( [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( +[[ yystack_.push (stack_symbol_type (]b4_join( [s], [sym.value], b4_locations_if([sym.location]))[));]])[ @@ -1086,7 +593,7 @@ b4_percent_code_get[]dnl if (m) YY_SYMBOL_PRINT (m, s); ]b4_variant_if( -[[ yystack_.push (stack_symbol_type (]b4_args( +[[ yystack_.push (stack_symbol_type (]b4_join( [s.state], [semantic_type()], b4_locations_if([s.location]))[)); @@ -1101,7 +608,7 @@ b4_percent_code_get[]dnl yystack_.pop (n); } -#if YYDEBUG +#if ]b4_api_PREFIX[DEBUG std::ostream& ]b4_parser_class_name[::debug_stream () const { @@ -1126,7 +633,29 @@ b4_percent_code_get[]dnl { 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 () @@ -1137,7 +666,6 @@ b4_percent_code_get[]dnl /* State. */ int yyn; int yylen = 0; - int yystate = 0; /* Error handling. */ int yynerrs_ = 0; @@ -1147,39 +675,35 @@ b4_percent_code_get[]dnl 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; 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 +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_) + if (yystack_[0].state == yyfinal_) goto yyacceptlab; goto yybackup; @@ -1188,21 +712,29 @@ m4_popdef([b4_at_dollar])])dnl yybackup: /* Try to take a decision without lookahead. */ - yyn = yypact_[yystate]; - if (yyn == yypact_ninf_) + yyn = yypact_[yystack_[0].state]; + if (yy_pact_value_is_default_ (yyn)) goto yydefault; /* Read a lookahead token. */ if (yyempty) { YYCDEBUG << "Reading a token: "; + try + { ]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 +[ yyla = b4_function_call([yylex], [symbol_type], + m4_ifdef([b4_lex_param], b4_lex_param));], +[ yyla.type = yytranslate_ (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)));])[ + } + catch (const syntax_error& yyexc) + { + error (yyexc); + goto yyerrlab1; + } yyempty = false; } YY_SYMBOL_PRINT ("Next token is", yyla); @@ -1217,10 +749,10 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param)));])[ 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. */ @@ -1232,15 +764,14 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param)));])[ --yyerrstatus_; /* Shift the lookahead token. */ - yystate = yyn; - yypush_ ("Shifting", yystate, yyla); + 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; @@ -1249,11 +780,12 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param)));])[ | 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: `$$ = $1'. Otherwise, use the top of the stack. @@ -1274,70 +806,72 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param)));])[ // Perform the reduction. YY_REDUCE_PRINT (yyn); - switch (yyn) + try { + switch (yyn) + { ]b4_user_actions[ - default: - break; + default: + break; + } + } + catch (const syntax_error& yyexc) + { + error (yyexc); + YYERROR; } - // Compute post-reduction state. - yyn = yyr1_[yyn]; - yystate = yypgoto_[yyn - yyntokens_] + yystack_[yylen].state; - if (0 <= yystate && yystate <= yylast_ - && yycheck_[yystate] == yystack_[yylen].state) - yystate = yytable_[yystate]; - else - yystate = yydefgoto_[yyn - yyntokens_]; - yylhs.state = yystate; YY_SYMBOL_PRINT ("-> $$ =", yylhs); ]b4_variant_if([[ - // Destroy the lhs symbols. + // Destroy the rhs 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]);]])[ + // 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 construction 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_ (YY_NULL, yystack_[i]);]])[ yypop_ (yylen); yylen = 0; YY_STACK_PRINT (); /* Shift the result of the reduction. */ - yypush_ (0, yylhs); + 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 (!yyerrstatus_) { - ++yynerrs_; - error (]b4_args(b4_locations_if([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)]])[); } ]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_) YYABORT; - else + else if (!yyempty) { yy_destroy_ ("Error: discarding", yyla); yyempty = true; - } + } } /* Else will try to reuse lookahead token after shifting the error @@ -1354,28 +888,27 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param)));])[ YYERROR and the label yyerrorlab therefore never appears in user code. */ if (false) - goto yyerrorlab; - -]b4_locations_if([[ - yyerror_range[0].location = yystack_[yylen - 1].location;]])[ + goto yyerrorlab;]b4_locations_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 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_) @@ -1390,18 +923,17 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param)));])[ 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_ (); - yystate = yystack_[0].state; 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. */ - error_token.state = yystate = yyn; + error_token.state = yyn; yypush_ ("Shifting", error_token); } goto yynewstate; @@ -1425,124 +957,126 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param)));])[ yypop_ (yylen); while (yystack_.size () != 1) { - yy_destroy_ ("Cleanup: popping", yystack_[0]); - yypop_ (); + yy_destroy_ ("Cleanup: popping", yystack_[0]); + yypop_ (); } return yyresult; } + 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([int yystate, int yytoken], +b4_error_verbose_if([state_type yystate, int yytoken], [int, int])[) - { - std::string yyres;]b4_error_verbose_if([[ - int yyn = yypact_[yystate]; - if (yypact_ninf_ < yyn && yyn <= yylast_) + {]b4_error_verbose_if([[ + std::string yyres; + // Number of reported tokens (one for the "unexpected", one per + // "expected"). + size_t yycount = 0; + // Its maximum. + enum { YYERROR_VERBOSE_ARGS_MAXIMUM = 5 }; + // Arguments of yyformat. + char const *yyarg[YYERROR_VERBOSE_ARGS_MAXIMUM]; + + /* There are many possibilities here to consider: + - If this state is a consistent state with a default action, then + the only way this function was invoked is if the default action + is an error action. In that case, don't check for expected + tokens because there are none. + - The only way there can be no lookahead present (in yytoken) is + if this state is a consistent state with a default action. + Thus, detecting the absence of a lookahead is sufficient to + determine that there is no unexpected or expected token to + report. In that case, just report a simple "syntax error". + - Don't assume there isn't a lookahead just because this state is + a consistent state with a default action. There might have + been a previous inconsistent state, consistent state with a + non-default action, or user semantic action that manipulated + yyla. (However, yyla is currently not documented for users.) + - Of course, the expected token list depends on states to have + correct lookahead information, and it depends on the parser not + to perform extra reductions after fetching a lookahead from the + scanner and before detecting a syntax error. Thus, state + merging (from LALR or IELR) and default reductions corrupt the + expected token list. However, the list is correct for + canonical LR with one exception: it will still contain any + token that will not be accepted due to an error action in a + later state. + */ + if (yytoken != yyempty_) { - /* Start YYX at -YYN if negative to avoid negative indexes in - YYCHECK. */ - 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 "expected" tokens. - 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_) + 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");]])[ } - /* 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])[; - - /* YYPGOTO[NTERM-NUM]. */ - ]b4_table_define([pgoto], [b4_pgoto])[; - - /* YYDEFGOTO[NTERM-NUM]. */ - ]b4_table_define([defgoto], [b4_defgoto])[; - - /* 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 - - /* 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])[; +]b4_parser_tables_define[ -#if YYDEBUG || YYERROR_VERBOSE || YYTOKEN_TABLE +]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* @@ -1550,11 +1084,9 @@ b4_error_verbose_if([int yystate, int yytoken], { ]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 @@ -1564,7 +1096,7 @@ b4_error_verbose_if([int yystate, int yytoken], 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; } @@ -1577,135 +1109,16 @@ b4_error_verbose_if([int yystate, int yytoken], int yynrhs = yyr2_[yyrule]; /* Print the symbols being reduced, and their result. */ *yycdebug_ << "Reducing stack by rule " << yyrule - 1 - << " (line " << yylno << "):" << std::endl; + << " (line " << yylno << "):" << std::endl; /* The symbols being reduced. */ for (int yyi = 0; yyi < yynrhs; yyi++) YY_SYMBOL_PRINT (" $" << yyi + 1 << " =", ]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[ - }; - const unsigned int user_token_number_max_ = ]b4_user_token_number_max[; - const token_number_type undef_token_ = ]b4_undef_token_number[; - - if (t <= yyeof_) - return yyeof_; - else if (static_cast (t) <= user_token_number_max_) - return translate_table[t]; - else - return undef_token_; - } +#endif // ]b4_api_PREFIX[DEBUG +]b4_lex_symbol_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 - -]b4_namespace_open[ - template > - 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 (); } - - private: - /// The wrapped container. - S seq_; - }; - - /// Present a slice of the top of a stack. - template > - 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