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1c59e0a121
* doc/bison.texinfo (Calc++): Add the extraction marks. * examples/extexi: New, from the aborted GNU Programming 2E. Separate the different paragraph of a file with empty lines. * examples/Makefile: Use it to extract the whole calc++ example.
67 lines
1.8 KiB
C++
67 lines
1.8 KiB
C++
#line 7188 "../../doc/bison.texinfo"
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%skeleton "lalr1.cc" /* -*- C++ -*- */
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%define "parser_class_name" "calcxx_parser"
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%defines
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%{
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# include <string>
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# include "calc++-driver.hh"
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%}
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#line 7204 "../../doc/bison.texinfo"
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// The parsing context.
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%parse-param { calcxx_driver& driver }
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%lex-param { calcxx_driver& driver }
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#line 7217 "../../doc/bison.texinfo"
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%locations
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%initial-action
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{
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// Initialize the initial location.
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@$.begin.filename = @$.end.filename = &driver.file;
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};
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#line 7231 "../../doc/bison.texinfo"
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%debug
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%error-verbose
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#line 7241 "../../doc/bison.texinfo"
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// Symbols.
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%union
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{
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int ival;
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std::string *sval;
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};
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#line 7258 "../../doc/bison.texinfo"
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%token YYEOF 0 "end of file"
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%token TOKEN_ASSIGN ":="
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%token <sval> TOKEN_IDENTIFIER "identifier"
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%token <ival> TOKEN_NUMBER "number"
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%type <ival> exp "expression"
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#line 7271 "../../doc/bison.texinfo"
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%printer { debug_stream () << *$$; } "identifier"
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%destructor { delete $$; } "identifier"
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%printer { debug_stream () << $$; } "number" "expression"
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#line 7282 "../../doc/bison.texinfo"
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%%
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%start unit;
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unit: assignments exp { driver.result = $2; };
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assignments: assignments assignment {}
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| /* Nothing. */ {};
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assignment: TOKEN_IDENTIFIER ":=" exp { driver.variables[*$1] = $3; };
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%left '+' '-';
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%left '*' '/';
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exp: exp '+' exp { $$ = $1 + $3; }
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| exp '-' exp { $$ = $1 - $3; }
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| exp '*' exp { $$ = $1 * $3; }
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| exp '/' exp { $$ = $1 / $3; }
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| TOKEN_IDENTIFIER { $$ = driver.variables[*$1]; }
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| TOKEN_NUMBER { $$ = $1; };
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%%
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#line 7308 "../../doc/bison.texinfo"
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void
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yy::calcxx_parser::error (const yy::calcxx_parser::location_type& l,
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const std::string& m)
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{
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driver.error (l, m);
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}
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