Introduction

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RDCore™ is an open-source project engineered and maintained by a private company, aiming to build a modern language platform for Visual Basic for Applications (VBA).
It ultimately provides a complete semantic model, runtime infrastructure, and extensible tooling surface to analyze, execute, and evolve VBA code outside of its historical environment.

💡 The idea

Think Roslyn, but for VBA.

RDCore reimagines VBA as a first-class language platform:

A detailed semantic model
A runtime decoupled from legacy environments
A modular architecture built around extensibility
A foundation for tooling, analysis, and execution

RDCore aims to to provide a sustainable, extensible platform for understanding and evolving the language.

VBA is not just a legacy runtime - it is a language specification. RDCore simply treats it as such.

🚀 Architecture

The RDCore.SDK library is licensed under ⚖️MIT;
Everything else built around it is licensed under ⚖️GPLv3.

RDCore solution overview

RDCore is composed of:

RDCore.SDK (MIT) defines the language core: syntax, symbols, semantic model, type system, etc.
RDCore.Runtime (GPLv3) implements SDK-defined abstractions around runtime semantics, the standard library, etc.
Hosts (GPLv3) include a CLI client (rdc.exe), a LSP server, and other applications that orchestrate execution and interactions.

✨ What RDCore Enables

Analyze VBA code at depths only LSP analyzers can reach
Execute VBA code outside the VBIDE
Build dev tools via the Language Server Protocol (LSP)
Inspect runtime behavior and semantic facts
Extend the platform with analyzers and plugins

📊 Project Status

RDCore is currently in active pre-alpha development.

👉 The current project status is kept up-to-date in README.md alongside its implementation in the GitHub repository.