CSharpLox

A cross-platform compiler/interpreter .NET Standard implementation of the Lox language.

Build

Run the build.ps1 script in the root of the project:

$ ./build

An "artifacts" folder will be created, it contains the executables, one for each platform (windows, osx, linux). (i.e The windows interpreter is at "artifacts/interpreter/win/cslox.exe")

After building, run basic-run.ps1 to test drive the built interpreter (on windows).

$ ./basic-run
Hello, World!

Usage

$ cslox [script]

You can also enter prompt mode by not specifying a script path:

$ cslox
> print 41 + 1;
42

To print the ast and exit:

$ cslox [script] --print-ast

Syntax

Lox is a simple dynamic programming language that supports object oriented aspects. It supports classes and inheritance.

A simple lox program:

class Greeter {
	init(name) {
		this.name = name;
	}

	greet() {
		print "Hello, " + this.name + "!";
	}
}

var greeter = Greeter("mrahhal");

greeter.greet();

Grammar

The context-free-grammar file contains the grammar of the whole language, expressed using a similar metasyntax to EBNF.

Project Structure

• Core: The core project, a class lib, handles scanning and parsing and lower level operations.
• Interpreter: The interpreter project, a cross platform executable that evaluates the program in C#.

Further Improvements

• Modules, importing other files
• More native functions. Right now, there's only a clock function.
• A bytecode compiler