QScript Language

Overview

QScript is an interpreted programming language written in C++. The project can be compiled on windows with Visual Studio and on OSX via gcc.

Syntax & language features

The syntax of QScript could be described as a mix of JavaScript/TypeScript & Objective-C. It offers optional typing similar to TypeScript and borrows some grammar -- such as its function call syntax -- from Objective-C. Feature-wise QScript supports everything from basic variables, loops, control-flow statements, functions and arrays to more advanced features such as tables, closures, automatic garbage collection, optional types and langsrv integrations. Unlike some of my other programming language projects, this is a more or less general purpose programming language that doesn't solve for a specific use-case.

Installation (Microsoft Windows)

• Install Visual Studio 2019 (any with v142 platform toolset will work)
• Open qscript-language.sln
• You can now compile and run any of the projects for x86/x64 release + debug

Installation (OSX)

• Install gcc (g++)
• Run

cd OSX

sh ./compile_pch.sh 		# Re-run if Includes/QLibPCH.h gets changed
sh ./compile_cli.sh 		# Compiles CLI project

./Lib/CLI.o --repl 			# Start CLI in REPL mode

Tests

Repository contains unit and ETE tests in Tests/. Most tests are end-to-end tests for

1. modeling real-world use-cases as closely as possible
2. testing all components of the language with a single set of tests
3. depending as little as possible on implementation details and focus on behavior

Repl

CLI contains repl mode which can be used with the --repl flag

Typing system

QScript contains optional compile-time types -- you can choose to use types or ignore them entirely

You can check also types with --typer CLI flag

Typer> var x = 1;
unknown -> none

Typer> const y = 1;
num -> none

Typer> const f = () -> auto { return "hello"; }
function -> string

Language server (& vscode extension)

JSON-based language server allows for easy integration of 3rd party software. For example, a vscode language extension (link to full repo here)

Debugger

Compiling the library with QVM_DEBUG preprocessor define will yield an interactive debugger for programs loaded in the VM