paul-webster/antlr4-cpp-example

a simple calculator built in antlr4 and c++

ANTLR4 CPP CALCULATOR

This is a simple project written in c++ that use antlr4 to parse simple arithmetic expressions and interpret them using the tools provided by the antlr runtime.

The calculator use Listeners to calculate the result of an arithmetic expression.

installation

The antlr runtime is cloned by the cmake superbuild system, and a copy of the antlr4.7.1 jar is provided in the external directory, so there are no need to directly install antlr, but java is required to execute the code generation.

To build the preject, execute the commands:

mkdir build
cd build
cmake ..
make

The first call to make require more time because it should download and build the antlr runtime.

usage

The calculator calc support +,-,* and / between integer number. It is also possible to use parenthesis. For example:

calc > (1 + 2)/3
1
calc > 1 + 2 + 3 + 4 - 5
5