MPP

M++ — Open Source Programing Language

Quick Start

Option A — C++ runtime (primary, recommended):

cd M++/cpp
.\build.bat
.\mpp.exe -r ..\examples\hello.mpp

Option B — Python-based .exe (fallback runtime):

cd M++
python build_exe.py
dist\mpp.exe -r examples\hello.mpp

See cpp/README.md for C++ build details.

Build apps (M++ “compiler”)

M++ apps are packaged using the native runtime. The C++ mpp.exe supports:

.\mpp.exe build ..\examples\hello.mpp -o ..\apps\HelloApp
..\apps\HelloApp\run.bat

This creates a distributable folder with:

• mpp.exe (runtime)
• app.mpp (your program)
• run.bat (launcher)

UI apps (HTML/CSS/JS) hosted by M++

M++ UI apps use the app folder format in apps/APP_FORMAT.md.

Example app included:

• apps/editor_app/ (HTML/CSS/JS editor UI + app.mpp backend)

Packaging command (C++ runtime):

.\mpp.exe build-app ..\apps\editor_app -o ..\apps\EditorBuild

Window hosting is provided by the native WebView2 host (C++). See apps/terminal_ui_cpp_host/.

Windows installer

See installer/README.md to build a real Windows installer that installs mpp.exe and can add it to PATH.

Interop with other languages (run alongside JS/Python/etc.)

M++ has exec(cmd) so you can call other languages/tools:

print(exec("python -c \"print(6*7)\""))

Tests (release hardening)

Run the regression suite against a runtime:

# Dist runtime (fallback)
npm run test:dist

# C++ runtime (primary) once you have cpp/mpp.exe built
npm run test:cpp

Features

From C++	From JavaScript	From Python
Optional static typing	Dynamic flexibility	Clean, readable syntax
C-style for loops	First-class functions	Implicit returns
Classes with pub/priv	Arrow functions =>	List literals [1,2,3]
Braces {} blocks	Object literals {a:1}	Comments //

Syntax Examples

Variables & Functions

let x = 42
let y: int = 100

fn add(a, b) { a + b }
fn double => x * 2

Control Flow

for (let i = 0; i < 10; i = i + 1) {
    print(i)
}

for (x in [1, 2, 3]) {
    print(x)
}

if (x > 0) { print("positive") }
elif (x < 0) { print("negative") }
else { print("zero") }

Classes

class Person {
    pub name
    priv age

    fn init(self, name, age) {
        self.name = name
        self.age = age
    }

    fn greet(self) {
        print("Hello, " + self.name)
    }
}

let p = new Person("Alice", 30)
p.greet()

Built-ins

• print(...) — output
• len(x) — length of array or string
• range(n) — [0, 1, ..., n-1]
• typeof(x) — type string

Project Structure

M++/
├── mpp/
│   ├── lexer.py      # Tokenizer
│   ├── parser.py     # AST builder
│   ├── ast.py        # AST nodes
│   └── interpreter.py# Runtime
├── examples/
│   ├── hello.mpp
│   ├── fibonacci.mpp
│   ├── classes.mpp
│   └── functions.mpp
├── run.py            # Entry point
├── SPEC.md           # Full specification
└── README.md

Requirements

• Python 3.7+

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