X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/cce7a5f4230618ddc7e256e8b83b7f0d84ff5909..05ac60f348b722ec6157cf57c31d8165466ec3ec:/data/lalr1.cc?ds=sidebyside diff --git a/data/lalr1.cc b/data/lalr1.cc index bab5e5f6..c613b3c8 100644 --- a/data/lalr1.cc +++ b/data/lalr1.cc @@ -1,6 +1,8 @@ m4_divert(-1) + # C++ skeleton for Bison -# Copyright (C) 2002 Free Software Foundation, Inc. + +# Copyright (C) 2002, 2003, 2004, 2005 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 @@ -21,11 +23,8 @@ m4_divert(-1) ## Default values. ## ## ---------------- ## -# Stack parameters. -m4_define_default([b4_stack_depth_init], [200]) - -# Default Parser class name. -m4_define_default([b4_parser_class_name], [Parser]) +# Default parser class name. +m4_define_default([b4_parser_class_name], [parser]) @@ -38,7 +37,7 @@ m4_define_default([b4_parser_class_name], [Parser]) # -------------------- # Expansion of $$. m4_define([b4_lhs_value], -[yyval[]m4_ifval([$1], [.$1])]) +[(yyval[]m4_ifval([$1], [.$1]))]) # b4_rhs_value(RULE-LENGTH, NUM, [TYPE]) @@ -46,15 +45,16 @@ m4_define([b4_lhs_value], # Expansion of $NUM, where the current rule has RULE-LENGTH # symbols on RHS. m4_define([b4_rhs_value], -[semantic_stack_@{m4_eval([$1 - $2])@}m4_ifval([$3], [.$3])]) +[(yysemantic_stack_@{m4_eval([$1 - $2])@}m4_ifval([$3], [.$3]))]) -m4_define_default([b4_location_type], [Location]) +m4_define_default([b4_location_type], [location]) +m4_define_default([b4_filename_type], [std::string]) # b4_lhs_location() # ----------------- # Expansion of @$. m4_define([b4_lhs_location], -[yyloc]) +[(yyloc)]) # b4_rhs_location(RULE-LENGTH, NUM) @@ -62,48 +62,77 @@ m4_define([b4_lhs_location], # Expansion of @NUM, where the current rule has RULE-LENGTH symbols # on RHS. m4_define([b4_rhs_location], -[location_stack_@{m4_eval([$1 - $2])@}]) - +[(yylocation_stack_@{m4_eval([$1 - $2])@})]) + + +# b4_parse_param_decl +# ------------------- +# Extra formal arguments of the constructor. +# Change the parameter names from "foo" into "foo_yyarg", so that +# there is no collision bw the user chosen attribute name, and the +# argument name in the constructor. +m4_define([b4_parse_param_decl], +[m4_ifset([b4_parse_param], + [m4_map_sep([b4_parse_param_decl_1], [, ], [b4_parse_param])])]) + +m4_define([b4_parse_param_decl_1], +[$1_yyarg]) + + + +# b4_parse_param_cons +# ------------------- +# Extra initialisations of the constructor. +m4_define([b4_parse_param_cons], + [m4_ifset([b4_parse_param], + [, + b4_cc_constructor_calls(b4_parse_param)])]) +m4_define([b4_cc_constructor_calls], + [m4_map_sep([b4_cc_constructor_call], [, + ], [$@])]) +m4_define([b4_cc_constructor_call], + [$2 ($2_yyarg)]) + +# b4_parse_param_vars +# ------------------- +# Extra instance variables. +m4_define([b4_parse_param_vars], + [m4_ifset([b4_parse_param], + [ + /* User arguments. */ +b4_cc_var_decls(b4_parse_param)])]) +m4_define([b4_cc_var_decls], + [m4_map_sep([b4_cc_var_decl], [ +], [$@])]) +m4_define([b4_cc_var_decl], + [ $1;]) -m4_define([b4_inherit], - [m4_ifdef([b4_root], - [: public b4_root -], - [])]) - -m4_define([b4_param], - [m4_ifdef([b4_root], - [, - const Param& param], - [])]) - -m4_define([b4_constructor], - [m4_ifdef([b4_root], - [b4_root (param), - ], - [])]) # We do want M4 expansion after # for CPP macros. m4_changecom() m4_divert(0)dnl -@output @output_header_name@ +m4_if(b4_defines_flag, 0, [], +[@output @output_header_name@ b4_copyright([C++ Skeleton parser for LALR(1) parsing with Bison], - [2002])[ + [2002, 2003, 2004])[ /* FIXME: This is wrong, we want computed header guards. I don't know why the macros are missing now. :( */ #ifndef PARSER_HEADER_H # define PARSER_HEADER_H -#include "stack.hh" -#include "location.hh" - #include #include /* Using locations. */ #define YYLSP_NEEDED ]b4_locations_flag[ +namespace yy +{ + class position; + class location; +} + ]b4_token_defines(b4_tokens)[ /* Copy the first part of user declarations. */ @@ -112,6 +141,9 @@ b4_copyright([C++ Skeleton parser for LALR(1) parsing with Bison], ]/* Line __line__ of lalr1.cc. */ b4_syncline([@oline@], [@ofile@])[ +#include "stack.hh" +#include "location.hh" + /* Enabling traces. */ #ifndef YYDEBUG # define YYDEBUG ]b4_debug[ @@ -122,14 +154,16 @@ b4_syncline([@oline@], [@ofile@])[ # define YYERROR_VERBOSE ]b4_error_verbose[ #endif -#ifndef YYSTYPE +#if ! defined (YYSTYPE) && ! defined (YYSTYPE_IS_DECLARED) ]m4_ifdef([b4_stype], [b4_syncline([b4_stype_line], [b4_filename]) -typedef union b4_stype yystype; +union YYSTYPE b4_stype; /* Line __line__ of lalr1.cc. */ b4_syncline([@oline@], [@ofile@])], -[typedef int yystype;])[ -# define YYSTYPE yystype +[typedef int YYSTYPE;])[ +# define yystype YYSTYPE /* obsolescent; will be withdrawn */ +# define YYSTYPE_IS_DECLARED 1 +# define YYSTYPE_IS_TRIVIAL 1 #endif /* Copy the second part of user declarations. */ @@ -137,59 +171,60 @@ b4_syncline([@oline@], [@ofile@])], ]/* Line __line__ of lalr1.cc. */ b4_syncline([@oline@], [@ofile@])[ +/* 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) \ - Current.last_line = Rhs[N].last_line; \ - Current.last_column = Rhs[N].last_column; +# define YYLLOC_DEFAULT(Current, Rhs, N) \ +do { \ + if (N) \ + { \ + (Current).begin = (Rhs)[1].begin; \ + (Current).end = (Rhs)[N].end; \ + } \ + else \ + { \ + (Current).begin = (Current).end = (Rhs)[0].end; \ + } \ +} while (0) #endif namespace yy { class ]b4_parser_class_name[; - template < typename P > - struct Traits + template + struct traits { }; - template < > - struct Traits< ]b4_parser_class_name[ > + template <> + struct traits<]b4_parser_class_name[> { - typedef ]b4_int_type_for([b4_translate])[ TokenNumberType; - typedef ]b4_int_type_for([b4_rhs])[ RhsNumberType; - typedef int StateType; - typedef yystype SemanticType; - typedef ]b4_location_type[ LocationType; + typedef ]b4_int_type_for([b4_translate])[ token_number_type; + typedef ]b4_int_type_for([b4_rhs])[ rhs_number_type; + typedef int state_type; + typedef YYSTYPE semantic_type; + typedef ]b4_location_type[ location_type; }; } namespace yy { - class ]b4_parser_class_name b4_inherit[ + /// A Bison parser. + class ]b4_parser_class_name[ { - public: - - typedef Traits< ]b4_parser_class_name[ >::TokenNumberType TokenNumberType; - typedef Traits< ]b4_parser_class_name[ >::RhsNumberType RhsNumberType; - typedef Traits< ]b4_parser_class_name[ >::StateType StateType; - typedef Traits< ]b4_parser_class_name[ >::SemanticType SemanticType; - typedef Traits< ]b4_parser_class_name[ >::LocationType LocationType; + /// Symbol semantic values. + typedef traits<]b4_parser_class_name[>::semantic_type semantic_type; + /// Symbol locations. + typedef traits<]b4_parser_class_name[>::location_type location_type; - typedef Stack< StateType > StateStack; - typedef Stack< SemanticType > SemanticStack; - typedef Stack< LocationType > LocationStack; - -#if YYLSP_NEEDED - ]b4_parser_class_name[ (bool debug, - LocationType initlocation][]b4_param[) : - ]b4_constructor[][debug_ (debug), - cdebug_ (std::cerr), - initlocation_ (initlocation) -#else - ]b4_parser_class_name[ (bool debug][]b4_param[) : - ]b4_constructor[][debug_ (debug), - cdebug_ (std::cerr) -#endif + public: + /// Build a parser object. + ]b4_parser_class_name[ (]b4_parse_param_decl[) : + yydebug_ (false), + yycdebug_ (&std::cerr)]b4_parse_param_cons[ { } @@ -197,430 +232,659 @@ namespace yy { } + /// Parse. + /// \returns 0 iff parsing succeeded. virtual int parse (); + /// The current debugging stream. + std::ostream& debug_stream () const; + /// Set the current debugging stream. + void set_debug_stream (std::ostream &); + + /// Type for debugging levels. + typedef int debug_level_type; + /// The current debugging level. + debug_level_type debug_level () const; + /// Set the current debugging level. + void set_debug_level (debug_level_type l); + private: - virtual void lex_ (); - virtual void error_ (); - virtual void print_ (); + /// Call the scanner. + virtual void yylex_ (); + + /// Report a syntax error. + /// \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); - /* Stacks. */ - StateStack state_stack_; - SemanticStack semantic_stack_; - LocationStack location_stack_; + /// Generate an error message, and invoke error. + virtual void yyreport_syntax_error_ (); +#if YYDEBUG + /// \brief Report a symbol on the debug stream. + /// \param yytype The token type. + /// \param yyvaluep Its semantic value. + /// \param yylocationp Its location. + virtual void yysymprint_ (int yytype, + const semantic_type* yyvaluep, + const location_type* yylocationp); +#endif /* ! YYDEBUG */ + + + /// State numbers. + typedef traits<]b4_parser_class_name[>::state_type state_type; + /// State stack type. + typedef stack state_stack_type; + /// Semantic value stack type. + typedef stack semantic_stack_type; + /// location stack type. + typedef stack location_stack_type; + + /// The state stack. + state_stack_type yystate_stack_; + /// The semantic value stack. + semantic_stack_type yysemantic_stack_; + /// The location stack. + location_stack_type yylocation_stack_; + + /// Internal symbol numbers. + typedef traits<]b4_parser_class_name[>::token_number_type token_number_type; /* Tables. */ - static const ]b4_int_type_for([b4_pact])[ pact_[]; - static const ]b4_int_type_for([b4_pact])[ pact_ninf_; - static const ]b4_int_type_for([b4_defact])[ defact_[]; - static const ]b4_int_type_for([b4_pgoto])[ pgoto_[]; - static const ]b4_int_type_for([b4_defgoto])[ defgoto_[]; - static const ]b4_int_type_for([b4_table])[ table_[]; - static const ]b4_int_type_for([b4_table])[ table_ninf_; - static const ]b4_int_type_for([b4_check])[ check_[]; - static const ]b4_int_type_for([b4_r1])[ r1_[]; - static const ]b4_int_type_for([b4_r2])[ r2_[]; + /// 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_[]; + + static const ]b4_int_type_for([b4_pgoto])[ yypgoto_[]; + static const ]b4_int_type_for([b4_defgoto])[ yydefgoto_[]; + + /// 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_; + + static const ]b4_int_type_for([b4_check])[ yycheck_[]; + + /// For a state, its accessing symbol. + static const ]b4_int_type_for([b4_stos])[ yystos_[]; + + /// 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 - static const char* const name_[]; + /// For a symbol, its name in clear. + static const char* const yyname_[]; #endif - /* More tables, for debugging. */ #if YYDEBUG - static const RhsNumberType rhs_[]; - static const ]b4_int_type_for([b4_prhs])[ prhs_[]; - static const ]b4_int_type_for([b4_rline])[ rline_[]; - static const ]b4_int_type_for([b4_stos])[ stos_[]; - static const ]b4_int_type_for([b4_toknum])[ token_number_[]; + /// A type to store symbol numbers and -1. + typedef traits<]b4_parser_class_name[>::rhs_number_type rhs_number_type; + /// A `-1'-separated list of the rules' RHS. + static const rhs_number_type yyrhs_[]; + /// For each rule, the index of the first RHS symbol in \a yyrhs_. + static const ]b4_int_type_for([b4_prhs])[ yyprhs_[]; + /// 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_[]; + /// Report on the debug stream that the rule \a r is going to be reduced. + virtual void yyreduce_print_ (int r); + /// Print the state stack on the debug stream. + virtual void yystack_print_ (); #endif - /* Even more tables. */ - static inline TokenNumberType translate_ (int token); + /// Convert a scanner token number to a symbol number. + inline token_number_type yytranslate_ (int token); + + /// \brief Reclaim the memory associated to a symbol. + /// \param yymsg Why this token is reclaimed. + /// \param yytype The symbol type. + /// \param yyvaluep Its semantic value. + /// \param yylocationp Its location. + inline void yydestruct_ (const char* yymsg, + int yytype, + semantic_type* yyvaluep, + location_type* yylocationp); + + /// Pop \a n symbols the three stacks. + inline void yypop_ (unsigned int n = 1); /* Constants. */ - static const int eof_; + static const int yyeof_; /* LAST_ -- Last index in TABLE_. */ - static const int last_; - static const int nnts_; - static const int empty_; - static const int final_; - static const int terror_; - static const int errcode_; - static const int ntokens_; - static const int initdepth_; - static const unsigned user_token_number_max_; - static const TokenNumberType undef_token_; + 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_; /* State. */ - int n_; - int len_; - int state_; - - /* Debugging. */ - int debug_; - std::ostream &cdebug_; + int yyn_; + int yylen_; + int yystate_; - /* Lookahead and lookahead in internal form. */ - int looka_; - int ilooka_; + /* Error handling. */ + int yynerrs_; + int yyerrstatus_; - /* Message. */ - std::string message; - - /* Semantic value and location of lookahead token. */ - SemanticType value; - LocationType location; - - /* @@$ and $$. */ - SemanticType yyval; - LocationType yyloc; - - /* Initial location. */ - LocationType initlocation_; + /* Debugging. */ + int yydebug_; + std::ostream* yycdebug_; + + /* Look-ahead and look-ahead in internal form. */ + int yylooka_; + int yyilooka_; + + /// Semantic value of the look-ahead. + semantic_type yylval; + /// Location of the look-ahead. + location_type yylloc; + /// The locations where the error started and ended. + location yyerror_range_[2]; + + /// $$. + semantic_type yyval; + /// @@$. + location_type yyloc; +]b4_parse_param_vars[ }; } #endif /* ! defined PARSER_HEADER_H */] -dnl +])dnl @output @output_parser_name@ b4_copyright([C++ Skeleton parser for LALR(1) parsing with Bison], - [2002])[ - -#include @output_header_name@ + [2002, 2003, 2004]) +m4_if(b4_prefix[], [yy], [], +[ +// Take the name prefix into account. +#define yylex b4_prefix[]lex]) +m4_if(b4_defines_flag, 0, [], +[ +#include @output_header_name@])[ + +/* A pseudo ostream that takes yydebug_ into account. */ +# define YYCDEBUG \ + for (bool yydebugcond_ = yydebug_; yydebugcond_; yydebugcond_ = false) \ + (*yycdebug_) /* Enable debugging if requested. */ #if YYDEBUG -# define YYCDEBUG if (debug_) cdebug_ + +# define YY_SYMBOL_PRINT(Title, Type, Value, Location) \ +do { \ + if (yydebug_) \ + { \ + *yycdebug_ << (Title) << ' '; \ + yysymprint_ ((Type), (Value), (Location)); \ + *yycdebug_ << std::endl; \ + } \ +} while (0) + +# define YY_REDUCE_PRINT(Rule) \ +do { \ + if (yydebug_) \ + yyreduce_print_ (Rule); \ +} while (0) + +# define YY_STACK_PRINT() \ +do { \ + if (yydebug_) \ + yystack_print_ (); \ +} while (0) + #else /* !YYDEBUG */ -# define YYCDEBUG if (0) cdebug_ + +# define YY_SYMBOL_PRINT(Title, Type, Value, Location) +# define YY_REDUCE_PRINT(Rule) +# define YY_STACK_PRINT() + #endif /* !YYDEBUG */ +#define YYACCEPT goto yyacceptlab +#define YYABORT goto yyabortlab +#define YYERROR goto yyerrorlab + +#if YYDEBUG +/*--------------------------------. +| Print this symbol on YYOUTPUT. | +`--------------------------------*/ + +void +yy::]b4_parser_class_name[::yysymprint_ (int yytype, + const semantic_type* yyvaluep, const location_type* yylocationp) +{ + /* Pacify ``unused variable'' warnings. */ + (void) yyvaluep; + (void) yylocationp; + /* Backward compatibility, but should be removed eventually. */ + std::ostream& cdebug_ = *yycdebug_; + (void) cdebug_; + + *yycdebug_ << (yytype < yyntokens_ ? "token" : "nterm") + << ' ' << yyname_[yytype] << " (" + << *yylocationp << ": "; + switch (yytype) + { +]m4_map([b4_symbol_actions], m4_defn([b4_symbol_printers]))dnl +[ default: + break; + } + *yycdebug_ << ')'; +} +#endif /* ! YYDEBUG */ + +void +yy::]b4_parser_class_name[::yydestruct_ (const char* yymsg, + int yytype, semantic_type* yyvaluep, location_type* yylocationp) +{ + /* Pacify ``unused variable'' warnings. */ + (void) yymsg; + (void) yyvaluep; + (void) yylocationp; + + YY_SYMBOL_PRINT (yymsg, yytype, yyvaluep, yylocationp); + + switch (yytype) + { +]m4_map([b4_symbol_actions], m4_defn([b4_symbol_destructors]))[ + default: + break; + } +} + +void +yy::]b4_parser_class_name[::yypop_ (unsigned int n) +{ + yystate_stack_.pop (n); + yysemantic_stack_.pop (n); + yylocation_stack_.pop (n); +} + +std::ostream& +yy::]b4_parser_class_name[::debug_stream () const +{ + return *yycdebug_; +} + +void +yy::]b4_parser_class_name[::set_debug_stream (std::ostream& o) +{ + yycdebug_ = &o; +} + + +yy::]b4_parser_class_name[::debug_level_type +yy::]b4_parser_class_name[::debug_level () const +{ + return yydebug_; +} + +void +yy::]b4_parser_class_name[::set_debug_level (debug_level_type l) +{ + yydebug_ = l; +} + + int yy::]b4_parser_class_name[::parse () { - int nerrs = 0; - int errstatus = 0; + YYCDEBUG << "Starting parse" << std::endl; - /* Initialize stack. */ - state_stack_ = StateStack (0); - semantic_stack_ = SemanticStack (1); - location_stack_ = LocationStack (1); + yynerrs_ = 0; + yyerrstatus_ = 0; /* Start. */ - state_ = 0; - looka_ = empty_; -#if YYLSP_NEEDED - location = initlocation_; -#endif - YYCDEBUG << "Starting parse" << std::endl; + yystate_ = 0; + yylooka_ = yyempty_; + +]m4_ifdef([b4_initial_action], [ +m4_pushdef([b4_at_dollar], [yylloc])dnl +m4_pushdef([b4_dollar_dollar], [yylval])dnl + /* User initialization code. */ + b4_initial_action +m4_popdef([b4_dollar_dollar])dnl +m4_popdef([b4_at_dollar])dnl +/* Line __line__ of yacc.c. */ +b4_syncline([@oline@], [@ofile@])])dnl + +[ /* Initialize the stacks. The initial state will be pushed in + yynewstate, since the latter expects the semantical and the + location values to have been already stored, initialize these + stacks with a primary value. */ + yystate_stack_ = state_stack_type (0); + yysemantic_stack_ = semantic_stack_type (0); + yylocation_stack_ = location_stack_type (0); + yysemantic_stack_.push (yylval); + yylocation_stack_.push (yylloc); /* New state. */ - yynewstate: - state_stack_.push (state_); - YYCDEBUG << "Entering state " << state_ << std::endl; +yynewstate: + yystate_stack_.push (yystate_); + YYCDEBUG << "Entering state " << yystate_ << std::endl; goto yybackup; /* Backup. */ - yybackup: +yybackup: - /* Try to take a decision without lookahead. */ - n_ = pact_[state_]; - if (n_ == pact_ninf_) + /* Try to take a decision without look-ahead. */ + yyn_ = yypact_[yystate_]; + if (yyn_ == yypact_ninf_) goto yydefault; - /* Read a lookahead token. */ - if (looka_ == empty_) - { - YYCDEBUG << "Reading a token: "; - lex_ (); - } + /* Read a look-ahead token. */ + if (yylooka_ == yyempty_) + yylex_ (); /* Convert token to internal form. */ - if (looka_ <= 0) + if (yylooka_ <= yyeof_) { - looka_ = eof_; - ilooka_ = 0; + yylooka_ = yyilooka_ = yyeof_; YYCDEBUG << "Now at end of input." << std::endl; } else { - ilooka_ = translate_ (looka_); -#if YYDEBUG - if (debug_) - { - YYCDEBUG << "Next token is " << looka_ - << " (" << name_[ilooka_]; - print_ (); - YYCDEBUG << ')' << std::endl; - } -#endif + yyilooka_ = yytranslate_ (yylooka_); + YY_SYMBOL_PRINT ("Next token is", yyilooka_, &yylval, &yylloc); } - n_ += ilooka_; - if (n_ < 0 || last_ < n_ || check_[n_] != ilooka_) + /* If the proper action on seeing token ILOOKA_ is to reduce or to + detect an error, take that action. */ + yyn_ += yyilooka_; + if (yyn_ < 0 || yylast_ < yyn_ || yycheck_[yyn_] != yyilooka_) goto yydefault; /* Reduce or error. */ - n_ = table_[n_]; - if (n_ < 0) + yyn_ = yytable_[yyn_]; + if (yyn_ < 0) { - if (n_ == table_ninf_) + if (yyn_ == yytable_ninf_) goto yyerrlab; else { - n_ = -n_; + yyn_ = -yyn_; goto yyreduce; } } - else if (n_ == 0) + else if (yyn_ == 0) goto yyerrlab; /* Accept? */ - if (n_ == final_) + if (yyn_ == yyfinal_) goto yyacceptlab; - /* Shift the lookahead token. */ - YYCDEBUG << "Shifting token " << looka_ - << " (" << name_[ilooka_] << "), "; + /* Shift the look-ahead token. */ + YY_SYMBOL_PRINT ("Shifting", yyilooka_, &yylval, &yylloc); /* Discard the token being shifted unless it is eof. */ - if (looka_ != eof_) - looka_ = empty_; + if (yylooka_ != yyeof_) + yylooka_ = yyempty_; - semantic_stack_.push (value); - location_stack_.push (location); + yysemantic_stack_.push (yylval); + yylocation_stack_.push (yylloc); /* Count tokens shifted since error; after three, turn off error status. */ - if (errstatus) - --errstatus; + if (yyerrstatus_) + --yyerrstatus_; - state_ = n_; + yystate_ = yyn_; goto yynewstate; - /* Default action. */ - yydefault: - n_ = defact_[state_]; - if (n_ == 0) +/*-----------------------------------------------------------. +| yydefault -- do the default action for the current state. | +`-----------------------------------------------------------*/ +yydefault: + yyn_ = yydefact_[yystate_]; + if (yyn_ == 0) goto yyerrlab; goto yyreduce; - /* Reduce. */ - yyreduce: - len_ = r2_[n_]; - if (len_) - { - yyval = semantic_stack_[len_ - 1]; - yyloc = location_stack_[len_ - 1]; - } +/*-----------------------------. +| yyreduce -- Do a reduction. | +`-----------------------------*/ +yyreduce: + yylen_ = yyr2_[yyn_]; + /* If LEN_ is nonzero, implement the default value of the action: + `$$ = $1'. Otherwise, use the top of the stack. + + Otherwise, the following line sets YYVAL to garbage. + This behavior is undocumented and Bison + users should not rely upon it. */ + if (yylen_) + yyval = yysemantic_stack_[yylen_ - 1]; else - { - yyval = semantic_stack_[0]; - yyloc = location_stack_[0]; - } + yyval = yysemantic_stack_[0]; -#if YYDEBUG - if (debug_) - { - YYCDEBUG << "Reducing via rule " << n_ - 1 - << " (line " << rline_[n_] << "), "; - for (]b4_int_type_for([b4_prhs])[ i = prhs_[n_]; - 0 <= rhs_[i]; ++i) - YYCDEBUG << name_[rhs_[i]] << ' '; - YYCDEBUG << "-> " << name_[r1_[n_]] << std::endl; - } -#endif - - if (len_) - { - Slice< LocationType, LocationStack > slice (location_stack_, len_); - YYLLOC_DEFAULT (yyloc, slice, len_); - } - - switch (n_) + { + slice slice (yylocation_stack_, yylen_); + YYLLOC_DEFAULT (yyloc, slice, yylen_); + } + YY_REDUCE_PRINT (yyn_); + switch (yyn_) { ]b4_actions[ + default: break; } ]/* Line __line__ of lalr1.cc. */ b4_syncline([@oline@], [@ofile@])[ - state_stack_.pop (len_); - semantic_stack_.pop (len_); - location_stack_.pop (len_); + yypop_ (yylen_); -#if YYDEBUG - if (debug_) - { - YYCDEBUG << "state stack now"; - for (StateStack::ConstIterator i = state_stack_.begin (); - i != state_stack_.end (); ++i) - YYCDEBUG << ' ' << *i; - YYCDEBUG << std::endl; - } -#endif + YY_STACK_PRINT (); - semantic_stack_.push (yyval); - location_stack_.push (yyloc); + yysemantic_stack_.push (yyval); + yylocation_stack_.push (yyloc); /* Shift the result of the reduction. */ - n_ = r1_[n_]; - state_ = pgoto_[n_ - ntokens_] + state_stack_[0]; - if (0 <= state_ && state_ <= last_ && check_[state_] == state_stack_[0]) - state_ = table_[state_]; + yyn_ = yyr1_[yyn_]; + yystate_ = yypgoto_[yyn_ - yyntokens_] + yystate_stack_[0]; + if (0 <= yystate_ && yystate_ <= yylast_ + && yycheck_[yystate_] == yystate_stack_[0]) + yystate_ = yytable_[yystate_]; else - state_ = defgoto_[n_ - ntokens_]; + yystate_ = yydefgoto_[yyn_ - yyntokens_]; goto yynewstate; - /* Report and recover from errors. This is very incomplete. */ - yyerrlab: +/*------------------------------------. +| yyerrlab -- here on detecting error | +`------------------------------------*/ +yyerrlab: /* If not already recovering from an error, report this error. */ - if (!errstatus) - { - ++nerrs; - -#if YYERROR_VERBOSE - n_ = pact_[state_]; - if (pact_ninf_ < n_ && n_ < last_) - { - message = "syntax error, unexpected "; - message += name_[ilooka_]; - { - int count = 0; - for (int x = (n_ < 0 ? -n_ : 0); x < ntokens_ + nnts_; ++x) - if (check_[x + n_] == x && x != terror_) - ++count; - if (count < 5) - { - count = 0; - for (int x = (n_ < 0 ? -n_ : 0); x < ntokens_ + nnts_; ++x) - if (check_[x + n_] == x && x != terror_) - { - message += (!count++) ? ", expecting " : " or "; - message += name_[x]; - } - } - } - } - else -#endif - message = "syntax error"; - error_ (); - } - goto yyerrlab1; + yyreport_syntax_error_ (); - /* Error raised explicitly by an action. */ - yyerrlab1: - if (errstatus == 3) + yyerror_range_[0] = yylloc; + if (yyerrstatus_ == 3) { - /* If just tried and failed to reuse lookahead token after an + /* If just tried and failed to reuse look-ahead token after an error, discard it. */ /* Return failure if at end of input. */ - if (looka_ == eof_) - goto yyabortlab; - YYCDEBUG << "Discarding token " << looka_ - << " (" << name_[ilooka_] << ")." << std::endl; - looka_ = empty_; + if (yylooka_ <= yyeof_) + { + /* If at end of input, pop the error token, + then the rest of the stack, then return failure. */ + if (yylooka_ == yyeof_) + for (;;) + { + yyerror_range_[0] = yylocation_stack_[0]; + yypop_ (); + if (yystate_stack_.height () == 1) + YYABORT; + yydestruct_ ("Error: popping", + yystos_[yystate_stack_[0]], + &yysemantic_stack_[0], + &yylocation_stack_[0]); + } + } + else + { + yydestruct_ ("Error: discarding", yyilooka_, &yylval, &yylloc); + yylooka_ = yyempty_; + } } - /* Else will try to reuse lookahead token after shifting the error + /* Else will try to reuse look-ahead token after shifting the error token. */ + goto yyerrlab1; - errstatus = 3; + +/*---------------------------------------------------. +| yyerrorlab -- error raised explicitly by YYERROR. | +`---------------------------------------------------*/ +yyerrorlab: + + /* Pacify compilers like GCC when the user code never invokes + YYERROR and the label yyerrorlab therefore never appears in user + code. */ + if (false) + goto yyerrorlab; + + yyerror_range_[0] = yylocation_stack_[yylen_ - 1]; + yypop_ (yylen_); + yystate_ = yystate_stack_[0]; + goto yyerrlab1; + +/*-------------------------------------------------------------. +| yyerrlab1 -- common code for both syntax error and YYERROR. | +`-------------------------------------------------------------*/ +yyerrlab1: + yyerrstatus_ = 3; /* Each real token shifted decrements this. */ for (;;) { - n_ = pact_[state_]; - if (n_ != pact_ninf_) + yyn_ = yypact_[yystate_]; + if (yyn_ != yypact_ninf_) { - n_ += terror_; - if (0 <= n_ && n_ <= last_ && check_[n_] == terror_) + yyn_ += yyterror_; + if (0 <= yyn_ && yyn_ <= yylast_ && yycheck_[yyn_] == yyterror_) { - n_ = table_[n_]; - if (0 < n_) + yyn_ = yytable_[yyn_]; + if (0 < yyn_) break; } } /* Pop the current state because it cannot handle the error token. */ - if (!state_stack_.height ()) - goto yyabortlab; - -#if YYDEBUG - if (debug_) - { - if (stos_[state_] < ntokens_) - { - YYCDEBUG << "Error: popping token " - << token_number_[stos_[state_]] - << " (" << name_[stos_[state_]]; -# ifdef YYPRINT - YYPRINT (stderr, token_number_[stos_[state_]], - semantic_stack_.top ()); -# endif - YYCDEBUG << ')' << std::endl; - } - else - { - YYCDEBUG << "Error: popping nonterminal (" - << name_[stos_[state_]] << ')' << std::endl; - } - } -#endif - - state_ = (state_stack_.pop (), state_stack_[0]); - semantic_stack_.pop (); - location_stack_.pop ();; - -#if YYDEBUG - if (debug_) - { - YYCDEBUG << "Error: state stack now"; - for (StateStack::ConstIterator i = state_stack_.begin (); - i != state_stack_.end (); ++i) - YYCDEBUG << ' ' << *i; - YYCDEBUG << std::endl; - } -#endif + if (yystate_stack_.height () == 1) + YYABORT; + + yyerror_range_[0] = yylocation_stack_[0]; + yydestruct_ ("Error: popping", + yystos_[yystate_], + &yysemantic_stack_[0], &yylocation_stack_[0]); + yypop_ (); + yystate_ = yystate_stack_[0]; + YY_STACK_PRINT (); } - if (n_ == final_) + if (yyn_ == yyfinal_) goto yyacceptlab; - YYCDEBUG << "Shifting error token, "; + yyerror_range_[1] = yylloc; + // Using YYLLOC is tempting, but would change the location of + // the look-ahead. YYLOC is available though. + YYLLOC_DEFAULT (yyloc, yyerror_range_ - 1, 2); + yysemantic_stack_.push (yylval); + yylocation_stack_.push (yyloc); - semantic_stack_.push (value); - location_stack_.push (location); + /* Shift the error token. */ + YY_SYMBOL_PRINT ("Shifting", yystos_[yyn_], + &yysemantic_stack_[0], &yylocation_stack_[0]); - state_ = n_; + yystate_ = yyn_; goto yynewstate; /* Accept. */ - yyacceptlab: +yyacceptlab: return 0; /* Abort. */ - yyabortlab: +yyabortlab: + /* Free the lookahead. */ + yydestruct_ ("Error: discarding lookahead", yyilooka_, &yylval, &yylloc); + yylooka_ = yyempty_; return 1; } void -yy::]b4_parser_class_name[::lex_ () +yy::]b4_parser_class_name[::yylex_ () { + YYCDEBUG << "Reading a token: "; #if YYLSP_NEEDED - looka_ = yylex (&value, &location); + yylooka_ = yylex (&yylval, &yylloc); #else - looka_ = yylex (&value); + yylooka_ = yylex (&yylval); #endif } +// Generate an error message, and invoke error. +void +yy::]b4_parser_class_name[::yyreport_syntax_error_ () +{ + /* If not already recovering from an error, report this error. */ + if (!yyerrstatus_) + { + ++yynerrs_; + std::string message; +#if YYERROR_VERBOSE + yyn_ = yypact_[yystate_]; + if (yypact_ninf_ < yyn_ && yyn_ < yylast_) + { + /* 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_; + int yyxend = yychecklim < yyntokens_ ? yychecklim : yyntokens_; + int count = 0; + for (int x = yyxbegin; x < yyxend; ++x) + if (yycheck_[x + yyn_] == x && x != yyterror_) + ++count; + + message = "syntax error, unexpected "; + message += yyname_[yyilooka_]; + if (count < 5) + { + count = 0; + for (int x = yyxbegin; x < yyxend; ++x) + if (yycheck_[x + yyn_] == x && x != yyterror_) + { + message += (!count++) ? ", expecting " : " or "; + message += yyname_[x]; + } + } + } + else +#endif + message = "syntax error"; + error (yylloc, message); + } +} + + /* YYPACT[STATE-NUM] -- Index in YYTABLE of the portion describing STATE-NUM. */ -const ]b4_int_type_for([b4_pact]) yy::b4_parser_class_name::pact_ninf_ = b4_pact_ninf[; +const ]b4_int_type(b4_pact_ninf, b4_pact_ninf) yy::b4_parser_class_name::yypact_ninf_ = b4_pact_ninf[; const ]b4_int_type_for([b4_pact])[ -yy::]b4_parser_class_name[::pact_[] = +yy::]b4_parser_class_name[::yypact_[] = { ]b4_pact[ }; @@ -629,21 +893,21 @@ yy::]b4_parser_class_name[::pact_[] = doesn't specify something else to do. Zero means the default is an error. */ const ]b4_int_type_for([b4_defact])[ -yy::]b4_parser_class_name[::defact_[] = +yy::]b4_parser_class_name[::yydefact_[] = { ]b4_defact[ }; /* YYPGOTO[NTERM-NUM]. */ const ]b4_int_type_for([b4_pgoto])[ -yy::]b4_parser_class_name[::pgoto_[] = +yy::]b4_parser_class_name[::yypgoto_[] = { ]b4_pgoto[ }; /* YYDEFGOTO[NTERM-NUM]. */ const ]b4_int_type_for([b4_defgoto])[ -yy::]b4_parser_class_name[::defgoto_[] = +yy::]b4_parser_class_name[::yydefgoto_[] = { ]b4_defgoto[ }; @@ -651,33 +915,33 @@ yy::]b4_parser_class_name[::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_for([b4_table]) yy::b4_parser_class_name::table_ninf_ = b4_table_ninf[; +const ]b4_int_type(b4_table_ninf, b4_table_ninf) yy::b4_parser_class_name::yytable_ninf_ = b4_table_ninf[; const ]b4_int_type_for([b4_table])[ -yy::]b4_parser_class_name[::table_[] = +yy::]b4_parser_class_name[::yytable_[] = { ]b4_table[ }; /* YYCHECK. */ const ]b4_int_type_for([b4_check])[ -yy::]b4_parser_class_name[::check_[] = +yy::]b4_parser_class_name[::yycheck_[] = { ]b4_check[ }; -#if YYDEBUG /* STOS_[STATE-NUM] -- The (internal number of the) accessing symbol of state STATE-NUM. */ const ]b4_int_type_for([b4_stos])[ -yy::]b4_parser_class_name[::stos_[] = +yy::]b4_parser_class_name[::yystos_[] = { ]b4_stos[ }; -/* TOKEN_NUMBER_[YYLEX-NUM] -- Internal token number corresponding +#if YYDEBUG +/* TOKEN_NUMBER_[YYLEX-NUM] -- Internal symbol number corresponding to YYLEX-NUM. */ const ]b4_int_type_for([b4_toknum])[ -yy::]b4_parser_class_name[::token_number_[] = +yy::]b4_parser_class_name[::yytoken_number_[] = { ]b4_toknum[ }; @@ -685,23 +949,23 @@ yy::]b4_parser_class_name[::token_number_[] = /* YYR1[YYN] -- Symbol number of symbol that rule YYN derives. */ const ]b4_int_type_for([b4_r1])[ -yy::]b4_parser_class_name[::r1_[] = +yy::]b4_parser_class_name[::yyr1_[] = { ]b4_r1[ }; /* YYR2[YYN] -- Number of symbols composing right hand side of rule YYN. */ const ]b4_int_type_for([b4_r2])[ -yy::]b4_parser_class_name[::r2_[] = +yy::]b4_parser_class_name[::yyr2_[] = { ]b4_r2[ }; #if YYDEBUG || YYERROR_VERBOSE /* YYTNAME[SYMBOL-NUM] -- String name of the symbol SYMBOL-NUM. - First, the terminals, then, starting at YYNTOKENS, nonterminals. */ + First, the terminals, then, starting at \a yyntokens_, nonterminals. */ const char* -const yy::]b4_parser_class_name[::name_[] = +const yy::]b4_parser_class_name[::yyname_[] = { ]b4_tname[ }; @@ -709,8 +973,8 @@ const yy::]b4_parser_class_name[::name_[] = #if YYDEBUG /* YYRHS -- A `-1'-separated list of the rules' RHS. */ -const yy::]b4_parser_class_name[::RhsNumberType -yy::]b4_parser_class_name[::rhs_[] = +const yy::]b4_parser_class_name[::rhs_number_type +yy::]b4_parser_class_name[::yyrhs_[] = { ]b4_rhs[ }; @@ -718,52 +982,76 @@ yy::]b4_parser_class_name[::rhs_[] = /* YYPRHS[YYN] -- Index of the first RHS symbol of rule number YYN in YYRHS. */ const ]b4_int_type_for([b4_prhs])[ -yy::]b4_parser_class_name[::prhs_[] = +yy::]b4_parser_class_name[::yyprhs_[] = { ]b4_prhs[ }; -/* YYRLINE[YYN] -- source line where rule number YYN was defined. */ +/* YYRLINE[YYN] -- Source line where rule number YYN was defined. */ const ]b4_int_type_for([b4_rline])[ -yy::]b4_parser_class_name[::rline_[] = +yy::]b4_parser_class_name[::yyrline_[] = { ]b4_rline[ }; -#endif + +// Print the state stack on the debug stream. +void +yy::]b4_parser_class_name[::yystack_print_ () +{ + *yycdebug_ << "Stack now"; + for (state_stack_type::const_iterator i = yystate_stack_.begin (); + i != yystate_stack_.end (); ++i) + *yycdebug_ << ' ' << *i; + *yycdebug_ << std::endl; +} + +// Report on the debug stream that the rule \a yyrule is going to be reduced. +void +yy::]b4_parser_class_name[::yyreduce_print_ (int yyrule) +{ + unsigned int yylno = yyrline_[yyrule]; + /* Print the symbols being reduced, and their result. */ + *yycdebug_ << "Reducing stack by rule " << yyn_ - 1 + << " (line " << yylno << "), "; + for (]b4_int_type_for([b4_prhs])[ i = yyprhs_[yyn_]; + 0 <= yyrhs_[i]; ++i) + *yycdebug_ << yyname_[yyrhs_[i]] << ' '; + *yycdebug_ << "-> " << yyname_[yyr1_[yyn_]] << std::endl; +} +#endif // YYDEBUG /* YYTRANSLATE(YYLEX) -- Bison symbol number corresponding to YYLEX. */ -yy::]b4_parser_class_name[::TokenNumberType -yy::]b4_parser_class_name[::translate_ (int token) +yy::]b4_parser_class_name[::token_number_type +yy::]b4_parser_class_name[::yytranslate_ (int token) { static - const TokenNumberType - translate_[] = + const token_number_type + translate_table[] = { ]b4_translate[ }; - if ((unsigned) token <= user_token_number_max_) - return translate_[token]; + if ((unsigned int) token <= yyuser_token_number_max_) + return translate_table[token]; else - return undef_token_; + return yyundef_token_; } -const int yy::]b4_parser_class_name[::eof_ = 0; -const int yy::]b4_parser_class_name[::last_ = ]b4_last[; -const int yy::]b4_parser_class_name[::nnts_ = ]b4_nterms_number[; -const int yy::]b4_parser_class_name[::empty_ = -2; -const int yy::]b4_parser_class_name[::final_ = ]b4_final_state_number[; -const int yy::]b4_parser_class_name[::terror_ = 1; -const int yy::]b4_parser_class_name[::errcode_ = 256; -const int yy::]b4_parser_class_name[::ntokens_ = ]b4_tokens_number[; -const int yy::]b4_parser_class_name[::initdepth_ = ]b4_stack_depth_init[; +const int yy::]b4_parser_class_name[::yyeof_ = 0; +const int yy::]b4_parser_class_name[::yylast_ = ]b4_last[; +const int yy::]b4_parser_class_name[::yynnts_ = ]b4_nterms_number[; +const int yy::]b4_parser_class_name[::yyempty_ = -2; +const int yy::]b4_parser_class_name[::yyfinal_ = ]b4_final_state_number[; +const int yy::]b4_parser_class_name[::yyterror_ = 1; +const int yy::]b4_parser_class_name[::yyerrcode_ = 256; +const int yy::]b4_parser_class_name[::yyntokens_ = ]b4_tokens_number[; -const unsigned yy::]b4_parser_class_name[::user_token_number_max_ = ]b4_user_token_number_max[; -const yy::]b4_parser_class_name[::TokenNumberType yy::]b4_parser_class_name[::undef_token_ = ]b4_undef_token_number[; +const unsigned int yy::]b4_parser_class_name[::yyuser_token_number_max_ = ]b4_user_token_number_max[; +const yy::]b4_parser_class_name[::token_number_type yy::]b4_parser_class_name[::yyundef_token_ = ]b4_undef_token_number[; ]b4_epilogue dnl @output stack.hh -b4_copyright([2002])[ +b4_copyright([stack handling for Bison C++ parsers], [2002, 2003, 2004])[ #ifndef BISON_STACK_HH # define BISON_STACK_HH @@ -772,34 +1060,35 @@ b4_copyright([2002])[ namespace yy { - template < class T, class S = std::deque< T > > - class Stack + template > + class stack { public: - typedef typename S::iterator Iterator; - typedef typename S::const_iterator ConstIterator; + // Hide our reversed order. + typedef typename S::reverse_iterator iterator; + typedef typename S::const_reverse_iterator const_iterator; - Stack () : seq_ () + stack () : seq_ () { } - Stack (unsigned n) : seq_ (n) + stack (unsigned int n) : seq_ (n) { } inline T& - operator [] (unsigned index) + operator [] (unsigned int i) { - return seq_[index]; + return seq_[i]; } inline const T& - operator [] (unsigned index) const + operator [] (unsigned int i) const { - return seq_[index]; + return seq_[i]; } inline @@ -811,73 +1100,275 @@ namespace yy inline void - pop (unsigned n = 1) + pop (unsigned int n = 1) { for (; n; --n) seq_.pop_front (); } inline - unsigned + unsigned int height () const { return seq_.size (); } - inline ConstIterator begin () const { return seq_.begin (); } - inline ConstIterator end () const { return seq_.end (); } + inline const_iterator begin () const { return seq_.rbegin (); } + inline const_iterator end () const { return seq_.rend (); } private: S seq_; }; - template < class T, class S = Stack< T > > - class Slice + /// Present a slice of the top of a stack. + template > + class slice { public: - Slice (const S& stack, - unsigned range) : stack_ (stack), - range_ (range) + slice (const S& stack, + unsigned int range) : stack_ (stack), + range_ (range) { } inline const T& - operator [] (unsigned index) const + operator [] (unsigned int i) const { - return stack_[range_ - index]; + return stack_[range_ - i]; } private: const S& stack_; - unsigned range_; + unsigned int range_; }; } #endif // not BISON_STACK_HH] dnl +@output position.hh +b4_copyright([Position class for Bison C++ parsers], [2002, 2003, 2004])[ + +/** + ** \file position.hh + ** Define the position class. + */ + +#ifndef BISON_POSITION_HH +# define BISON_POSITION_HH + +# include +# include + +namespace yy +{ + /// Abstract a position. + class position + { + public: + /// Initial column number. + static const unsigned int initial_column = 0; + /// Initial line number. + static const unsigned int initial_line = 1; + + /** \name Ctor & dtor. + ** \{ */ + public: + /// Construct a position. + position () : + filename (0), + line (initial_line), + column (initial_column) + { + } + /** \} */ + + + /** \name Line and Column related manipulators + ** \{ */ + public: + /// (line related) Advance to the COUNT next lines. + inline void lines (int count = 1) + { + column = initial_column; + line += count; + } + + /// (column related) Advance to the COUNT next columns. + inline void columns (int count = 1) + { + int leftmost = initial_column; + int current = column; + if (leftmost <= current + count) + column += count; + else + column = initial_column; + } + /** \} */ + + public: + /// File name to which this position refers. + ]b4_filename_type[* filename; + /// Current line number. + unsigned int line; + /// Current column number. + unsigned int column; + }; + + /// Add and assign a position. + inline const position& + operator+= (position& res, const int width) + { + res.columns (width); + return res; + } + + /// Add two position objects. + inline const position + operator+ (const position& begin, const int width) + { + position res = begin; + return res += width; + } + + /// Add and assign a position. + inline const position& + operator-= (position& res, const int width) + { + return res += -width; + } + + /// Add two position objects. + inline const position + operator- (const position& begin, const int width) + { + return begin + -width; + } + + /** \brief Intercept output stream redirection. + ** \param ostr the destination output stream + ** \param pos a reference to the position to redirect + */ + inline std::ostream& + operator<< (std::ostream& ostr, const position& pos) + { + if (pos.filename) + ostr << *pos.filename << ':'; + return ostr << pos.line << '.' << pos.column; + } + +} +#endif // not BISON_POSITION_HH] @output location.hh -b4_copyright([2002])[ +b4_copyright([Location class for Bison C++ parsers], [2002, 2003, 2004])[ + +/** + ** \file location.hh + ** Define the location class. + */ #ifndef BISON_LOCATION_HH # define BISON_LOCATION_HH +# include +# include +# include "position.hh" + namespace yy { - struct Position + + /// Abstract a location. + class location { - int line; - int column; + /** \name Ctor & dtor. + ** \{ */ + public: + /// Construct a location. + location () : + begin (), + end () + { + } + /** \} */ + + + /** \name Line and Column related manipulators + ** \{ */ + public: + /// Reset initial location to final location. + inline void step () + { + begin = end; + } + + /// Extend the current location to the COUNT next columns. + inline void columns (unsigned int count = 1) + { + end += count; + } + + /// Extend the current location to the COUNT next lines. + inline void lines (unsigned int count = 1) + { + end.lines (count); + } + /** \} */ + + + public: + /// Beginning of the located region. + position begin; + /// End of the located region. + position end; }; - struct Location + /// Join two location objects to create a location. + inline const location operator+ (const location& begin, const location& end) { - Position first; - Position last; - }; + location res = begin; + res.end = end.end; + return res; + } + + /// Add two location objects. + inline const location operator+ (const location& begin, unsigned int width) + { + location res = begin; + res.columns (width); + return res; + } + + /// Add and assign a location. + inline location& operator+= (location& res, unsigned int width) + { + res.columns (width); + return res; + } + + /** \brief Intercept output stream redirection. + ** \param ostr the destination output stream + ** \param loc a reference to the location to redirect + ** + ** Avoid duplicate information. + */ + inline std::ostream& operator<< (std::ostream& ostr, const location& loc) + { + position last = loc.end - 1; + ostr << loc.begin; + if (last.filename + && (!loc.begin.filename + || *loc.begin.filename != *last.filename)) + ostr << '-' << last; + else if (loc.begin.line != last.line) + ostr << '-' << last.line << '.' << last.column; + else if (loc.begin.column != last.column) + ostr << '-' << last.column; + return ostr; + } + } #endif // not BISON_LOCATION_HH]