82 lines
3.0 KiB
C++
82 lines
3.0 KiB
C++
/*=============================================================================
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Copyright (c) 2001-2014 Joel de Guzman
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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=============================================================================*/
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///////////////////////////////////////////////////////////////////////////////
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//
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// Same as calc6, but this version also shows off grammar modularization.
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// Here you will see how expressions is built as a modular grammars.
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//
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// [ JDG Sometime 2000 ] pre-boost
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// [ JDG September 18, 2002 ] spirit1
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// [ JDG April 8, 2007 ] spirit2
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// [ JDG February 18, 2011 ] Pure attributes. No semantic actions.
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// [ JDG April 9, 2014 ] Spirit X3 (from qi calc6)
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// [ JDG May 2, 2014 ] Modular grammar using BOOST_SPIRIT_DEFINE.
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//
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///////////////////////////////////////////////////////////////////////////////
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#include "ast.hpp"
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#include "vm.hpp"
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#include "compiler.hpp"
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#include "expression.hpp"
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#include "error_handler.hpp"
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///////////////////////////////////////////////////////////////////////////////
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// Main program
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///////////////////////////////////////////////////////////////////////////////
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int
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main()
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{
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std::cout << "/////////////////////////////////////////////////////////\n\n";
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std::cout << "Expression parser...\n\n";
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std::cout << "/////////////////////////////////////////////////////////\n\n";
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std::cout << "Type an expression...or [q or Q] to quit\n\n";
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typedef std::string::const_iterator iterator_type;
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typedef client::ast::expression ast_expression;
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typedef client::compiler compiler;
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std::string str;
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while (std::getline(std::cin, str))
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{
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if (str.empty() || str[0] == 'q' || str[0] == 'Q')
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break;
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using boost::spirit::x3::ascii::space;
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client::vmachine mach; // Our virtual machine
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std::vector<int> code; // Our VM code
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auto calc = client::expression(); // grammar
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ast_expression ast; // Our program (AST)
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compiler compile(code); // Compiles the program
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iterator_type iter = str.begin();
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iterator_type const end = str.end();
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bool r = phrase_parse(iter, end, calc, space, ast);
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if (r && iter == end)
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{
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std::cout << "-------------------------\n";
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std::cout << "Parsing succeeded\n";
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compile(ast);
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mach.execute(code);
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std::cout << "\nResult: " << mach.top() << std::endl;
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std::cout << "-------------------------\n";
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}
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else
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{
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std::string rest(iter, end);
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std::cout << "-------------------------\n";
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std::cout << "Parsing failed\n";
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std::cout << "-------------------------\n";
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}
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}
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std::cout << "Bye... :-) \n\n";
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return 0;
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}
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