diff options
Diffstat (limited to 'examples/interpreter.cpp')
-rw-r--r-- | examples/interpreter.cpp | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/examples/interpreter.cpp b/examples/interpreter.cpp new file mode 100644 index 000000000000..08fba796a45d --- /dev/null +++ b/examples/interpreter.cpp @@ -0,0 +1,83 @@ +// Copyright 2012 Google Inc. +// All rights reserved. +// +// Redistribution and use in source and binary forms, with or without +// modification, are permitted provided that the following conditions are +// met: +// +// * Redistributions of source code must retain the above copyright +// notice, this list of conditions and the following disclaimer. +// * Redistributions in binary form must reproduce the above copyright +// notice, this list of conditions and the following disclaimer in the +// documentation and/or other materials provided with the distribution. +// * Neither the name of Google Inc. nor the names of its contributors +// may be used to endorse or promote products derived from this software +// without specific prior written permission. +// +// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +/// \file examples/interpreter.cpp +/// Implementation of a basic command-line Lua interpreter. + +#include <cstdlib> +#include <iostream> +#include <string> + +#include <lutok/exceptions.hpp> +#include <lutok/operations.hpp> +#include <lutok/state.ipp> + + +/// Executes a Lua statement provided by the user with error checking. +/// +/// \param state The Lua state in which to process the statement. +/// \param line The textual statement provided by the user. +static void +run_statement(lutok::state& state, const std::string& line) +{ + try { + // This utility function allows us to feed a given piece of Lua code to + // the interpreter and process it. The piece of code can include + // multiple statements separated by a semicolon or by a newline + // character. + lutok::do_string(state, line, 0, 0, 0); + } catch (const lutok::error& error) { + std::cerr << "ERROR: " << error.what() << '\n'; + } +} + + +/// Program's entry point. +/// +/// \return A system exit code. +int +main(void) +{ + // Create a new session and load some standard libraries. + lutok::state state; + state.open_base(); + state.open_string(); + state.open_table(); + + for (;;) { + std::cout << "lua> "; + std::cout.flush(); + + std::string line; + if (!std::getline(std::cin, line).good()) + break; + run_statement(state, line); + } + + return EXIT_SUCCESS; +} |