Building Eger v0.1: An Experimental Programming Language Engine Built from Scratch (Windows Release)

Eger Programming Language — Sat, 26 Sep 2026 06:48:00 +0000

Hey DEV Community! 👋

I'm excited to share Eger v0.1, an experimental programming language engine built from scratch.

What started as a prototype (Eger_Compiler.py) has officially been upgraded into a fully executable, standalone Windows toolchain.

💡 What is Eger?

Eger is an experimental, open-source programming language featuring an elegant, Python-inspired syntax.

Developed with the assistance of Gemini AI, Eger is built in Python using llvmlite as a compiled programming language that leverages LLVM for low-level code generation and runtime execution.

Key Features in v0.1:

Standalone Windows Installer: Easy setup package built with Inno Setup.
Environment PATH Support: Automatically adds eger to your System PATH so you can invoke it directly from cmd.
Interactive REPL: Run eger from terminal to test code interactively.
LLVM Runtime Execution: Uses memory-managed execution via the LLVM MCJIT engine.

🛠️ Architecture & Lessons Learned

During the initial release, I hit a major packaging challenge:

The Issue: Bundling llvmlite into a single-file executable (--onefile) triggered Windows Application Control errors (WinError 4551) when attempting to unpack llvmlite.dll to the system's Temp directory.
The Solution: I transitioned to a directory-based bundle (--onedir) wrapped inside a standard Windows Setup installer. Installing directly to structured program folders resolved security policies and binary initialization failures.

🚀 Try it Out!

If you are on Windows 10 or 11 (64-bit), you can download and test the release today:

📥 Download Installer: Eger v0.1 Installer (.exe)
💻 GitHub Repository: egerlanguage/Eger
🌐 Project Website: Eger Documentation

⚠️ Note for Early Alpha Users: If you cloned earlier commits containing Eger_Compiler.py, please update to v0.1. The legacy Python script has been deprecated and replaced by the compiled binary release.

💬 Feedback & Contributions

Since this is an experimental project, I'd love to hear your feedback on:

Syntax design & error reporting clarity.
Installation and setup experience on your Windows machine.

Feel free to drop comments below or open an issue on our GitHub Repo!

I Built My Own Programming Language Engine From Scratch (Meet Eger!)

Eger Programming Language — Tue, 26 May 2026 22:00:22 +0000

Hey fellow devs! 👋

For the past few weeks, I’ve been obsessed with how programming language parsers and runtime environments work under the hood. Instead of just reading about it, I decided to build my own interpreter engine from scratch.

Meet Eger (v0.1.0-Alpha) — an experimental, structured programming language engine written entirely in Python.

🚀 What makes Eger unique?

Eger isn't just a standard script runner; it enforces strict architectural boundaries:

Explicit Phase Segmentation: Programs must execute in sequential layout phases (Header Specification ➡️ Library Import Declarations ➡️ Executable Body Code).
Strict Layout Safety Constraints: The compiler automatically flags an error if more than 3 continuous space characters are found, promoting uniform typography.
Dual Execution Modes: It features a live, interactive testing REPL shell interface alongside a standard standalone script runner.

🛠️ The AI-Assisted Architecture Workflow

As a creator, I mapped out the initial grammar, constraints, and structural rules. To bring it to life rapidly, I leaned into a modern prompt engineering workflow using Gemini 3.5 Flash with Extended Thinking.

Using advanced reasoning models allowed me to rapidly test alternative pattern translations, optimize token execution, and build a fully functional compiler prototype in record time.

📝 Here is what an `.egr` script looks like:


eger
Envelop: "script"
#call stdio
#call math

--- Sample Launch Demo ---
try:
  write("Initializing Eger Language Engine...")
  write(div(10, 2))
flag:
  write("System Flag Triggered: An error occurred safely!")               

## 📦 Check out the Repo & Let's Connect!

The project is officially open-source today under the MIT License! I'd love for you to check out the codebase, spin up the REPL, and let me know what you think. Drop a ⭐ if you find the concept interesting!

* **GitHub Repository:** https://github.com/egerlanguage/Eger
* **Project Email:** egerlanguage@gmail.com

DEV Community: Eger Programming Language