X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/575619af5e1f61a5f78fb3910bee424ead5fe5a6..11aef5e95b890364474c49c7d4529de2bec3544e:/data/lalr1.cc?ds=sidebyside diff --git a/data/lalr1.cc b/data/lalr1.cc index dab5ab9b..91cb5cf0 100644 --- a/data/lalr1.cc +++ b/data/lalr1.cc @@ -1,6 +1,6 @@ # C++ skeleton for Bison -# Copyright (C) 2002-2011 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 @@ -20,16 +20,16 @@ m4_include(b4_pkgdatadir/[c++.m4]) # b4_integral_parser_table_declare(TABLE-NAME, CONTENT, COMMENT) # -------------------------------------------------------------- -# Declare "parser::yy_" which contents is CONTENT. +# Declare "parser::yy_" whose contents is CONTENT. m4_define([b4_integral_parser_table_declare], -[m4_ifval([$3], [b4_c_comment([$3], [ ]) +[m4_ifval([$3], [b4_comment([$3], [ ]) ])dnl static const b4_int_type_for([$2]) yy$1_[[]];dnl ]) # b4_integral_parser_table_define(TABLE-NAME, CONTENT, COMMENT) # ------------------------------------------------------------- -# Define "parser::yy_" which contents is CONTENT. +# Define "parser::yy_" whose contents is CONTENT. m4_define([b4_integral_parser_table_define], [ const b4_int_type_for([$2]) b4_parser_class_name::yy$1_[[]] = @@ -98,84 +98,72 @@ m4_define([b4_rhs_location], # Same as in C, but using references instead of pointers. m4_define([b4_symbol_action], [b4_symbol_if([$1], [has_$2], -[m4_pushdef([b4_dollar_dollar], - [b4_symbol_value_template([yysym.value], - b4_symbol_if([$1], [has_type], - [b4_symbol([$1], [type])]))])dnl -m4_pushdef([b4_at_dollar], [yysym.location])dnl +[m4_pushdef([b4_symbol_value], m4_defn([b4_symbol_value_template]))[]dnl +b4_dollar_pushdef([yysym.value], + b4_symbol_if([$1], [has_type], + [m4_dquote(b4_symbol([$1], [type]))]), + [yysym.location])dnl b4_symbol_case_([$1]) b4_syncline([b4_symbol([$1], [$2_line])], ["b4_symbol([$1], [$2_file])"]) b4_symbol([$1], [$2]) b4_syncline([@oline@], [@ofile@]) break; -m4_popdef([b4_at_dollar])dnl -m4_popdef([b4_dollar_dollar])dnl +m4_popdef([b4_symbol_value])[]dnl +b4_dollar_popdef[]dnl ])]) +# b4_lex +# ------ +# Call yylex. +m4_define([b4_lex], +[b4_token_ctor_if( +[b4_function_call([yylex], + [symbol_type], m4_ifdef([b4_lex_param], b4_lex_param))], +[b4_function_call([yylex], [int], + [b4_api_PREFIX[STYPE*], [&yyla.value]][]dnl +b4_locations_if([, [[location*], [&yyla.location]]])dnl +m4_ifdef([b4_lex_param], [, ]b4_lex_param))])]) + + m4_pushdef([b4_copyright_years], - [2002-2011]) + [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([b4_percent_define_ifdef([[location_type]], [], - [# Backward compatibility. - m4_define([b4_location_constructors]) - m4_include(b4_pkgdatadir/[location.cc])])]) +b4_bison_locations_if([# Backward compatibility. + m4_define([b4_location_constructors]) + m4_include(b4_pkgdatadir/[location.cc])]) m4_include(b4_pkgdatadir/[stack.hh]) b4_variant_if([m4_include(b4_pkgdatadir/[variant.hh])]) -# We do want M4 expansion after # for CPP macros. -m4_changecom() -m4_divert_push(0)dnl -@output(b4_spec_defines_file@)@ -b4_copyright([Skeleton interface for Bison LALR(1) parsers in C++]) -dnl FIXME: This is wrong, we want computed header guards. -[ -/* C++ LALR(1) parser skeleton written by Akim Demaille. */ - -#ifndef PARSER_HEADER_H -# define PARSER_HEADER_H - -]b4_percent_code_get([[requires]])[ - -]b4_parse_assert_if([#include ])[ -#include -#include -#include -#include "stack.hh" -]b4_locations_if([b4_percent_define_ifdef([[location_type]], [], - [[#include "location.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_bison_locations_if([[# include "location.hh"]])])[ +]b4_variant_if([b4_variant_includes])[ + +]b4_YYDEBUG_define[ -]b4_variant_if([b4_namespace_open -b4_variant_define -b4_namespace_close])[ - -/* Enabling traces. */ -#ifndef YYDEBUG -# define YYDEBUG ]b4_parse_trace_if([1], [0])[ -#endif - -/* Enabling verbose error messages. */ -#ifdef YYERROR_VERBOSE -# undef YYERROR_VERBOSE -# define YYERROR_VERBOSE 1 -#else -# define YYERROR_VERBOSE ]b4_error_verbose_if([1], [0])[ -#endif +]b4_namespace_open[ -/* Enabling the token table. */ -#ifndef YYTOKEN_TABLE -# define YYTOKEN_TABLE ]b4_token_table[ -#endif +]b4_defines_if([], +[b4_stack_define +b4_bison_locations_if([b4_position_define +b4_location_define])])[ -]b4_namespace_open[ +]b4_variant_if([b4_variant_define])[ /// A Bison parser. class ]b4_parser_class_name[ @@ -190,7 +178,7 @@ b4_namespace_close])[ /// \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. @@ -204,10 +192,13 @@ b4_namespace_close])[ void set_debug_level (debug_level_type l); #endif - /// Report a syntax error.]b4_locations_if([ - /// \param loc where the syntax error is found.])[ + /// Report a syntax error.]b4_locations_if([[ + /// \param loc where the syntax error is found.]])[ /// \param msg a description of the syntax error. - virtual void error (]b4_locations_if([const location_type& loc, ])[const std::string& msg); + virtual void error (]b4_locations_if([[const location_type& loc, ]])[const std::string& msg); + + /// Report a syntax error. + void error (const syntax_error& err); private: /// State numbers. @@ -236,34 +227,30 @@ b4_namespace_close])[ static const ]b4_int_type(b4_pact_ninf, b4_pact_ninf)[ yypact_ninf_; static const ]b4_int_type(b4_table_ninf, b4_table_ninf)[ yytable_ninf_; - /* Tables. */ -]b4_parser_tables_declare[ + /// Convert a scanner token number \a t to a symbol number. + static inline token_number_type yytranslate_ (]b4_token_ctor_if([token_type], [int])[ t); -#if YYDEBUG || YYERROR_VERBOSE || YYTOKEN_TABLE - /// For a symbol, its name in clear. - static const char* const yytname_[]; -#endif]b4_error_verbose_if([ + // Tables. +]b4_parser_tables_declare[]b4_error_verbose_if([ /// Convert the symbol name \a n to a form suitable for a diagnostic. static std::string yytnamerr_ (const char *n);])[ -#if YYDEBUG +]b4_token_table_if([], [[#if ]b4_api_PREFIX[DEBUG]])[ + /// For a symbol, its name in clear. + static const char* const yytname_[]; +]b4_token_table_if([[#if ]b4_api_PREFIX[DEBUG]])[ ]b4_integral_parser_table_declare([rline], [b4_rline], - [YYRLINE[YYN] -- Source line where rule number YYN was defined.])[ + [[YYRLINE[YYN] -- Source line where rule number YYN was defined.]])[ /// Report on the debug stream that the rule \a r is going to be reduced. virtual void yy_reduce_print_ (int r); /// Print the state stack on the debug stream. virtual void yystack_print_ (); - /* Debugging. */ + // Debugging. int yydebug_; std::ostream* yycdebug_; -#endif - - /// Convert a scanner token number \a t to a symbol number. - static inline token_number_type yytranslate_ (]b4_lex_symbol_if([token_type], [int])[ t); -#if YYDEBUG /// \brief Display a symbol type, value and location. /// \param yyo The output stream. /// \param yysym The symbol. @@ -280,7 +267,6 @@ b4_namespace_close])[ inline void yy_destroy_ (const char* yymsg, symbol_base_type& yysym) const; - private: /// Element of the stack: a state and its attributes. struct stack_symbol_type : symbol_base_type { @@ -291,7 +277,7 @@ b4_namespace_close])[ 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]))[); @@ -326,7 +312,7 @@ b4_namespace_close])[ /// Pop \a n symbols the three stacks. inline void yypop_ (unsigned int n = 1); - /* Constants. */ + // Constants. enum { yyeof_ = 0, @@ -336,28 +322,46 @@ b4_namespace_close])[ yyfinal_ = ]b4_final_state_number[, //< Termination state number. yyterror_ = 1, yyerrcode_ = 256, - yyntokens_ = ]b4_tokens_number[, //< Number of tokens. + yyntokens_ = ]b4_tokens_number[ //< Number of tokens. }; ]b4_parse_param_vars[ }; -]b4_lex_symbol_if([b4_yytranslate_define +]b4_token_ctor_if([b4_yytranslate_define b4_public_types_define])[ ]b4_namespace_close[ ]b4_percent_define_flag_if([[global_tokens_and_yystype]], -[b4_token_defines(b4_tokens) +[b4_token_defines -#ifndef YYSTYPE - /* Redirection for backward compatibility. */ -# define YYSTYPE b4_namespace_ref::b4_parser_class_name::semantic_type +#ifndef ]b4_api_PREFIX[STYPE + // Redirection for backward compatibility. +# define ]b4_api_PREFIX[STYPE b4_namespace_ref::b4_parser_class_name::semantic_type #endif +])[ +]b4_percent_code_get([[provides]])[ +]]) + +b4_defines_if( +[b4_output_begin([b4_spec_defines_file]) +b4_copyright([Skeleton interface for Bison LALR(1) parsers in C++]) +[ +/** + ** \file ]b4_spec_defines_file[ + ** Define the ]b4_namespace_ref[::parser class. + */ + +// C++ LALR(1) parser skeleton written by Akim Demaille. + +]b4_cpp_guard_open([b4_spec_defines_file])[ +]b4_shared_declarations[ +]b4_cpp_guard_close([b4_spec_defines_file]) +b4_output_end() ]) -b4_percent_code_get([[provides]])[]dnl -[#endif /* ! defined PARSER_HEADER_H */] -@output(b4_parser_file_name@)@ + +b4_output_begin([b4_parser_file_name]) b4_copyright([Skeleton implementation for Bison LALR(1) parsers in C++]) b4_percent_code_get([[top]])[]dnl m4_if(b4_prefix, [yy], [], @@ -365,19 +369,22 @@ 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[ -/* 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_ +// User implementation prologue. +]b4_user_post_prologue[ +]b4_percent_code_get[ + +#ifndef YY_ # if defined YYENABLE_NLS && YYENABLE_NLS # if ENABLE_NLS -# include /* FIXME: INFRINGES ON USER NAME SPACE */ +# include // FIXME: INFRINGES ON USER NAME SPACE. # define YY_(msgid) dgettext ("bison-runtime", msgid) # endif # endif @@ -387,33 +394,16 @@ b4_percent_code_get[]dnl #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). */ - -#define YYRHSLOC(Rhs, K) ((Rhs)[K].location) -#ifndef YYLLOC_DEFAULT -# define YYLLOC_DEFAULT(Current, Rhs, N) \ - do \ - if (N) \ - { \ - (Current).begin = YYRHSLOC (Rhs, 1).begin; \ - (Current).end = YYRHSLOC (Rhs, N).end; \ - } \ - else \ - { \ - (Current).begin = (Current).end = YYRHSLOC (Rhs, 0).end; \ - } \ - while (false) -#endif]])[ - -/* Suppress unused-variable warnings by "using" E. */ -#define YYUSE(e) ((void) (e)) - -/* Enable debugging if requested. */ -#if YYDEBUG - -/* A pseudo ostream that takes yydebug_ into account. */ +[#define YYRHSLOC(Rhs, K) ((Rhs)[K].location) +]b4_yylloc_default_define])[ + +// Suppress unused-variable warnings by "using" E. +#define YYUSE(E) ((void) (E)) + +// Enable debugging if requested. +#if ]b4_api_PREFIX[DEBUG + +// A pseudo ostream that takes yydebug_ into account. # define YYCDEBUG if (yydebug_) (*yycdebug_) # define YY_SYMBOL_PRINT(Title, Symbol) \ @@ -426,26 +416,26 @@ 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) @@ -480,7 +470,7 @@ b4_percent_code_get[]dnl case '\\': if (*++yyp != '\\') goto do_not_strip_quotes; - /* Fall through. */ + // Fall through. default: yyr += *yyp; break; @@ -498,7 +488,7 @@ 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[ @@ -514,7 +504,7 @@ b4_percent_code_get[]dnl | Symbol types. | `---------------*/ -]b4_lex_symbol_if([], [b4_public_types_define])[ +]b4_token_ctor_if([], [b4_public_types_define])[ // stack_symbol_type. ]b4_parser_class_name[::stack_symbol_type::stack_symbol_type () @@ -523,7 +513,7 @@ 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]))[) @@ -544,12 +534,11 @@ 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) { ]b4_symbol_foreach([b4_symbol_destructor])dnl @@ -561,12 +550,14 @@ b4_percent_code_get[]dnl 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([ @@ -575,7 +566,7 @@ b4_percent_code_get[]dnl { ]b4_symbol_foreach([b4_symbol_printer])dnl [ default: - break; + break; } yyo << ')'; } @@ -588,13 +579,13 @@ 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]))[));]])[ @@ -606,7 +597,7 @@ 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]))[)); @@ -621,7 +612,7 @@ b4_percent_code_get[]dnl yystack_.pop (n); } -#if YYDEBUG +#if ]b4_api_PREFIX[DEBUG std::ostream& ]b4_parser_class_name[::debug_stream () const { @@ -646,7 +637,7 @@ 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) @@ -676,11 +667,11 @@ b4_percent_code_get[]dnl /// Whether yyla contains a lookahead. bool yyempty = true; - /* State. */ + // State. int yyn; int yylen = 0; - /* Error handling. */ + // Error handling. int yynerrs_ = 0; int yyerrstatus_ = 0; @@ -693,55 +684,61 @@ b4_percent_code_get[]dnl /// $$ and @@$. stack_symbol_type yylhs; - /// The return value of parse(). + /// The return value of parse (). int yyresult; + // FIXME: This shoud be completely indented. It is not yet to + // avoid gratuitous conflicts when merging into the master branch. + try + { YYCDEBUG << "Starting parse" << std::endl; ]m4_ifdef([b4_initial_action], [ -m4_pushdef([b4_at_dollar], [yyla.location])dnl -m4_pushdef([b4_dollar_dollar], [yyla.value])dnl - /* User initialization code. */ +b4_dollar_pushdef([yyla.value], [], [yyla.location])dnl + // User initialization code. b4_user_initial_action -m4_popdef([b4_dollar_dollar])dnl -m4_popdef([b4_at_dollar])])dnl +b4_dollar_popdef])[]dnl [ /* Initialize the stack. The initial state will be set in yynewstate, since the latter expects the semantical and the location values to have been already stored, initialize these stacks with a primary value. */ yystack_ = stack_type (0); - yypush_ (0, 0, yyla); + yypush_ (YY_NULL, 0, yyla); // A new symbol was pushed on the stack. yynewstate: YYCDEBUG << "Entering state " << yystack_[0].state << std::endl; - /* Accept? */ + // Accept? if (yystack_[0].state == yyfinal_) goto yyacceptlab; goto yybackup; - /* Backup. */ + // Backup. yybackup: - /* Try to take a decision without lookahead. */ + // Try to take a decision without lookahead. yyn = yypact_[yystack_[0].state]; if (yy_pact_value_is_default_ (yyn)) goto yydefault; - /* Read a lookahead token. */ + // Read a lookahead token. if (yyempty) { YYCDEBUG << "Reading a token: "; -]b4_lex_symbol_if( -[ yyla = b4_c_function_call([yylex], [symbol_type], - m4_ifdef([b4_lex_param], b4_lex_param));], -[ yyla.type = yytranslate_ (b4_c_function_call([yylex], [int], - [[YYSTYPE*], [&yyla.value]][]dnl -b4_locations_if([, [[location*], [&yyla.location]]])dnl -m4_ifdef([b4_lex_param], [, ]b4_lex_param)));])[ + try + {]b4_token_ctor_if([[ + symbol_type yylookahead = ]b4_lex[; + yyla.move (yylookahead);]], [[ + yyla.type = yytranslate_ (]b4_lex[);]])[ + } + catch (const syntax_error& yyexc) + { + error (yyexc); + goto yyerrlab1; + } yyempty = false; } YY_SYMBOL_PRINT ("Next token is", yyla); @@ -752,25 +749,24 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param)));])[ if (yyn < 0 || yylast_ < yyn || yycheck_[yyn] != yyla.type) goto yydefault; - /* Reduce or error. */ + // Reduce or error. yyn = yytable_[yyn]; if (yyn <= 0) { - if (yy_table_value_is_error_ (yyn)) - goto yyerrlab; - yyn = -yyn; - goto yyreduce; + if (yy_table_value_is_error_ (yyn)) + goto yyerrlab; + yyn = -yyn; + goto yyreduce; } - /* Discard the token being shifted. */ + // Discard the token being shifted. yyempty = true; - /* Count tokens shifted since error; after three, turn off error - status. */ + // Count tokens shifted since error; after three, turn off error status. if (yyerrstatus_) --yyerrstatus_; - /* Shift the lookahead token. */ + // Shift the lookahead token. yypush_ ("Shifting", yyn, yyla); goto yynewstate; @@ -814,53 +810,52 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param)));])[ // Perform the reduction. YY_REDUCE_PRINT (yyn); try - { - switch (yyn) { + switch (yyn) + { ]b4_user_actions[ - default: - break; + default: + break; + } } - } catch (const syntax_error& yyexc) - { - error (]b4_args(b4_locations_if([yyexc.location]), - [[yyexc.what()]])[); - YYERROR; - } + { + error (yyexc); + YYERROR; + } YY_SYMBOL_PRINT ("-> $$ =", yylhs); ]b4_variant_if([[ // Destroy the rhs symbols. for (int i = 0; i < yylen; ++i) - // Destroy a variant which value may have been swapped with + // Destroy a variant whose value may have been swapped with // yylhs.value (for instance if the action was "std::swap($$, // $1)"). The value of yylhs.value (hence possibly one of these - // rhs symbols) depends on the default contruction for this + // 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_ (0, yystack_[i]);]])[ + yy_destroy_ (YY_NULL, yystack_[i]);]])[ yypop_ (yylen); yylen = 0; YY_STACK_PRINT (); - /* Shift the result of the reduction. */ - yypush_ (0, yylhs); + // Shift the result of the reduction. + yypush_ (YY_NULL, yylhs); goto yynewstate; /*--------------------------------------. | yyerrlab -- here on detecting error. | `--------------------------------------*/ yyerrlab: - /* If not already recovering from an error, report this error. */ + // If not already recovering from an error, report this error. if (!yyerrstatus_) { - ++yynerrs_; - error (]b4_args(b4_locations_if([yyla.location]), + ++yynerrs_; + error (]b4_join(b4_locations_if([yyla.location]), [[yysyntax_error_ (yystack_[0].state, yyempty ? yyempty_ : yyla.type)]])[); } @@ -869,21 +864,20 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param)));])[ 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. */ + // Return failure if at end of input. if (yyla.type == 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; @@ -900,7 +894,7 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param)));])[ 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 + /* Do not reclaim the symbols of the rule whose action triggered this YYERROR. */ yypop_ (yylen); yylen = 0; @@ -910,7 +904,7 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param)));])[ | 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 (;;) @@ -940,18 +934,18 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param)));])[ yyerror_range[2].location = yyla.location; YYLLOC_DEFAULT (error_token.location, yyerror_range, 2);]])[ - /* Shift the error token. */ + // Shift the error token. error_token.state = yyn; yypush_ ("Shifting", error_token); } goto yynewstate; - /* Accept. */ + // Accept. yyacceptlab: yyresult = 0; goto yyreturn; - /* Abort. */ + // Abort. yyabortlab: yyresult = 1; goto yyreturn; @@ -960,17 +954,41 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param)));])[ 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 @@ -1022,7 +1040,7 @@ b4_error_verbose_if([state_type yystate, int yytoken], 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. */ + // 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) @@ -1040,7 +1058,7 @@ b4_error_verbose_if([state_type yystate, int yytoken], } } - char const* yyformat = 0; + char const* yyformat = YY_NULL; switch (yycount) { #define YYCASE_(N, S) \ @@ -1077,17 +1095,16 @@ b4_error_verbose_if([state_type yystate, int yytoken], ]b4_parser_tables_define[ -#if YYDEBUG || YYERROR_VERBOSE || YYTOKEN_TABLE - /* YYTNAME[SYMBOL-NUM] -- String name of the symbol SYMBOL-NUM. - First, the terminals, then, starting at \a yyntokens_, nonterminals. */ +]b4_token_table_if([], [[#if ]b4_api_PREFIX[DEBUG]])[ + // YYTNAME[SYMBOL-NUM] -- String name of the symbol SYMBOL-NUM. + // First, the terminals, then, starting at \a yyntokens_, nonterminals. const char* const ]b4_parser_class_name[::yytname_[] = { ]b4_tname[ }; -#endif -#if YYDEBUG +]b4_token_table_if([[#if ]b4_api_PREFIX[DEBUG]])[ ]b4_integral_parser_table_define([rline], [b4_rline])[ // Print the state stack on the debug stream. @@ -1098,7 +1115,7 @@ b4_error_verbose_if([state_type 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; } @@ -1109,18 +1126,20 @@ b4_error_verbose_if([state_type yystate, int yytoken], { unsigned int yylno = yyrline_[yyrule]; int yynrhs = yyr2_[yyrule]; - /* Print the symbols being reduced, and their result. */ + // Print the symbols being reduced, and their result. *yycdebug_ << "Reducing stack by rule " << yyrule - 1 - << " (line " << yylno << "):" << std::endl; - /* The symbols being reduced. */ + << " (line " << yylno << "):" << std::endl; + // The symbols being reduced. for (int yyi = 0; yyi < yynrhs; yyi++) YY_SYMBOL_PRINT (" $" << yyi + 1 << " =", ]b4_rhs_data(yynrhs, yyi + 1)[); } -#endif // YYDEBUG +#endif // ]b4_api_PREFIX[DEBUG -]b4_lex_symbol_if([], [b4_yytranslate_define])[ +]b4_token_ctor_if([], [b4_yytranslate_define])[ ]b4_namespace_close[ ]b4_epilogue[]dnl -m4_divert_pop(0) +b4_output_end() + + m4_popdef([b4_copyright_years])dnl