1 // Copyright 2012 Google Inc. 2 // All rights reserved. 3 // 4 // Redistribution and use in source and binary forms, with or without 5 // modification, are permitted provided that the following conditions are 6 // met: 7 // 8 // * Redistributions of source code must retain the above copyright 9 // notice, this list of conditions and the following disclaimer. 10 // * Redistributions in binary form must reproduce the above copyright 11 // notice, this list of conditions and the following disclaimer in the 12 // documentation and/or other materials provided with the distribution. 13 // * Neither the name of Google Inc. nor the names of its contributors 14 // may be used to endorse or promote products derived from this software 15 // without specific prior written permission. 16 // 17 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 18 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 19 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 20 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 21 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 22 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 23 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 27 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 29 /// \file examples/interpreter.cpp 30 /// Implementation of a basic command-line Lua interpreter. 31 32 #include <cstdlib> 33 #include <iostream> 34 #include <string> 35 36 #include <lutok/exceptions.hpp> 37 #include <lutok/operations.hpp> 38 #include <lutok/state.ipp> 39 40 41 /// Executes a Lua statement provided by the user with error checking. 42 /// 43 /// \param state The Lua state in which to process the statement. 44 /// \param line The textual statement provided by the user. 45 static void 46 run_statement(lutok::state& state, const std::string& line) 47 { 48 try { 49 // This utility function allows us to feed a given piece of Lua code to 50 // the interpreter and process it. The piece of code can include 51 // multiple statements separated by a semicolon or by a newline 52 // character. 53 lutok::do_string(state, line, 0, 0, 0); 54 } catch (const lutok::error& error) { 55 std::cerr << "ERROR: " << error.what() << '\n'; 56 } 57 } 58 59 60 /// Program's entry point. 61 /// 62 /// \return A system exit code. 63 int 64 main(void) 65 { 66 // Create a new session and load some standard libraries. 67 lutok::state state; 68 state.open_base(); 69 state.open_string(); 70 state.open_table(); 71 72 for (;;) { 73 std::cout << "lua> "; 74 std::cout.flush(); 75 76 std::string line; 77 if (!std::getline(std::cin, line).good()) 78 break; 79 run_statement(state, line); 80 } 81 82 return EXIT_SUCCESS; 83 } 84