peach 🍑

A lightweight dependency-free scripting language. All scripts can be evaluated in C++17 program runtime.

Documentation

Wiki is avaiable on github: syntax page

Current features

• Command line interpreter

• File interpreter

• Single variable type - std::int32_t

• if/else conditions

• while loops

• Division into blocks with indentation

• Variable declaration with let keyword

• Arithmetical, logical operators and corresponding assignation operators (a += 1 is simillar to a = a + 1)

• Informative error messages

Building

• Make sure following commands works fine on your machine:

git --version
cmake --version
clang-10 --version

• Build project by typing in your command line:

mkdir build && cd build
cmake ..
make

• Executable file can be found in /build/peach if build was successfull

How to use

Use with command line interface

• Simply run /build/peach, you will get:

gleb@ZenBook:~/Documents/projects/peach$ ./build/peach
Peach
>>> let even_numbers = 0
0
>>> let n = 11
11
>>> while n -= 1
...     even_numbers += n % 2 == 0
...
5
>>>

• And you're good to go

Write script

• Simply run /build/peach <filename>, where <filename> contains program code, for example, if this is hello.pch

let a = 123
let cnt_even = 0
let cnt_odd = 0
let some_other_variable
while (a != 0) & cnt_even < 10
    if a % 2 == 0
        cnt_even += 1
        if cnt_even % 3 == 2:
            some_other_variable += 2 ** cnt_even
    else
        cnt_odd += 1
    a -= 1
some_other_variable

Then you program evaluation will look like:

gleb@ZenBook:~/Documents/projects/peach$ ./build/peach hello.pch
292

Evaluate in C++17 program runtime

#include <fstream>

#include "PeachCli.hpp"

int main()
{
    auto programFile = std::ifstream("<your-peach-program-relative-path>");
    auto interpreter = peach::cli::PeachCli();
    interpreter.getScope().declare("var", 10);
    interpreter.getScope().declare("bar", 20);
    // Now interpreter contains two variables: var = 10, bar = 20
    interpreter.executeProgram(programFile, std::cerr);
    std::cout << "var: " << interpreter.getScope()["var"] << std::endl;
    std::cout << "bar: " << interpreter.getScope()["bar"] << std::endl;
}