This repository contains an interpreter for the Monkey language written in C++. The work is based on the book "Writing An Interpreter In Go" by Thorsten Ball (https://interpreterbook.com/) but with the implementation done in C++ instead of Go. For more details regarding the Monkey Language, see MonkeyLang.
Note! The current status of the implementation is very rudimentary; only a first version of a lexical analyser, a parser and a simple REPL have been implemented so far.
A first version of a Read Eval Print Loop (REPL) has been implemented. The REPL is an interactive command line tool that reads input, send this input to the interpreter and outputs a result. An example can be seen below. The interpreter will take a line as input, send it through the lexer and the parser and then evaluate the parsed statements.
Monkey Programming Language Interpreter!
See https://monkeylang.org/ for more information
Type in your commands (exit with CRTL-D)
>>> true;
true
>>> !false;
true
>>> 8;
8
>>> -55;
-55
>>> 3+4*2;
11
>>> 3+4/2+9*(2+3)-8;
42
>>> if (2 > 1) {10;}
10
>>> if (1 > 2) {10;} else {20;}
20
The implementation of the interpreter is done i C++ and the build chain uses CMake. See CMake for more information.
Use the steps below to build and run the interpreter. The procedure need a Unix-like build environment. On Windows it is possible to use Cygwin. Make sure to include a compiler for C++ and CMake.
mkdir build
cd build
cmake ..
make all -j
This will build an executable in the folder build/src.
The project includes a set of unit tests that use the CppUTest test framework. To be able to build the tests, the CppUTest framework must be available on the computer. This can be accomplished either by having the framework installed or by downloading and building it locally. The CMakeLists.txt for the test cases support both alternatives.
To build the unit tests, set COMPILE_TESTS=ON when calling CMake. This is
default ON.
On a system with CppUTest pre-installed, use the following sequence to generate makefiles, build and run the tests:
mkdir build
cd build
cmake -DCOMPILE_TESTS=ON ..
make all test -j
To use a locally built version of the CppUTest framework, set the
CPPUTEST_HOME variable to specify the location of the locally built CppUTest
framework (-DCPPUTEST_HOME=\<path to CppUTest>). Note that the build needs
the file CppUTestConfig.cmake that is created during the build.
Use the steps below to build the CppUTest framework or see CppUTest.
git clone https://github.com/cpputest/cpputest.git
cd cpputest/cpputest_build
cmake ..
make all test -j