The latest articles on DEV Community by Eger Language (@eger-language). https://dev.to/eger-language https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https:%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F3953266%2Fe8c65155-304d-4a73-bb1d-39f1232d7ad6.png https://dev.to/eger-language en Eger Language Tue, 26 May 2026 22:00:22 +0000 https://dev.to/eger-language/i-built-my-own-programming-language-engine-from-scratch-meet-eger-3bjm https://dev.to/eger-language/i-built-my-own-programming-language-engine-from-scratch-meet-eger-3bjm <p>Hey fellow devs! 👋</p> <p>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. </p> <p>Meet <strong>Eger</strong> (v0.1.0-Alpha) — an experimental, structured programming language engine written entirely in Python.</p> <h2> 🚀 What makes Eger unique? </h2> <p>Eger isn't just a standard script runner; it enforces strict architectural boundaries:</p> <ol> <li> <strong>Explicit Phase Segmentation:</strong> Programs must execute in sequential layout phases (<code>Header Specification</code> ➡️ <code>Library Import Declarations</code> ➡️ <code>Executable Body Code</code>).</li> <li> <strong>Strict Layout Safety Constraints:</strong> The compiler automatically flags an error if more than 3 continuous space characters are found, promoting uniform typography.</li> <li> <strong>Dual Execution Modes:</strong> It features a live, interactive testing REPL shell interface alongside a standard standalone script runner.</li> </ol> <h2> 🛠️ The AI-Assisted Architecture Workflow </h2> <p>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 <strong>Gemini 3.5 Flash with Extended Thinking</strong>. </p> <p>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. </p> <h2> 📝 Here is what an <code>.egr</code> script looks like: </h2> <div class="highlight js-code-highlight"> <pre class="highlight plaintext"><code> 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 &amp; 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 </code></pre> </div> python opensource ai showdev