/* Parser for calc++. -*- C++ -*-
Copyright (C) 2005-2015, 2018-2021 Free Software Foundation, Inc.
This file is part of Bison, the GNU Compiler Compiler.
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
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
%skeleton "lalr1.cc" // -*- C++ -*-
%require "3.8.2"
%header
%define api.token.raw
%define api.token.constructor
%define api.value.type variant
%define parse.assert
%code requires {
# include <string>
class driver;
}
// The parsing context.
%param { driver& drv }
%locations
%define parse.trace
%define parse.error detailed
%define parse.lac full
%code {
# include "driver.hh"
}
%define api.token.prefix {TOK_}
%token
ASSIGN ":="
MINUS "-"
PLUS "+"
STAR "*"
SLASH "/"
LPAREN "("
RPAREN ")"
;
%token <std::string> IDENTIFIER "identifier"
%token <int> NUMBER "number"
%nterm <int> exp
%printer { yyo << $$; } <*>;
%%
%start unit;
unit: assignments exp { drv.result = $2; };
assignments:
%empty {}
| assignments assignment {};
assignment:
"identifier" ":=" exp { drv.variables[$1] = $3; };
%left "+" "-";
%left "*" "/";
exp:
"number"
| "identifier" { $$ = drv.variables[$1]; }
| exp "+" exp { $$ = $1 + $3; }
| exp "-" exp { $$ = $1 - $3; }
| exp "*" exp { $$ = $1 * $3; }
| exp "/" exp { $$ = $1 / $3; }
| "(" exp ")" { $$ = $2; }
%%
void
yy::parser::error (const location_type& l, const std::string& m)
{
std::cerr << l << ": " << m << '\n';
}
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