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<h1>fddl Programming Language</h1>
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<img src="01.png" alt="Lexer Screenshot">
<img src="02.png" alt="Lexer Tests Screenshot">
<img src="03.png" alt="REPL Screenshot">
<img src="04.png" alt="Parsing 'hello, world'">
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<h2>Overview</h2>
<p>fddl is a small programming language inspired by various languages, designed to help learn language implementation concepts in <a href="https://rust-lang.org">Rust</a>.</p>
<p>I have, off and on throughout the last 15 or so years attempted to learn a programming language of some sort. I could always get through the basics, but would get stuck with any real-world projects. And I wouldn't know who to turn to even if I knew where to start.</p>
<p>So I started learning Rust and really like it. I've been following some tutorials and the <a href="http://craftinginterpreters.com/">Crafting Interpreters</a> site as guides for this very problematic programming language.</p>
<p>I like aspects of so many programming languages, but I don't really like any of them, so I always found it hard to pick one and stick with it. But I had the same problem playing World of Warcraft, too.</p>
<p>So I, like many of you, decided to make a hobby programming language to see what may be able to be done with it. This is a brand new project as of September 2024 and I am one person.</p>
<p>The fact that I have a REPL working in this language is nothing short of amazing to me. It's fucking magic.</p>
<h2>Features</h2>
<ul>
<li>Custom syntax with unique (and arguably deranged) operators and keywords</li>
<li>Documentation comments using <code>#</code>, similar to Rust's style</li>
<li>Lexer and parser built from scratch</li>
</ul>
<h2>Getting Started</h2>
<p>Keep in mind, this is only at the lexer stage currently. It'll read your inputs and that's it.</p>
<p>To clone the repo:</p>
<pre><code class="language-bash">git clone https://git.fddl.dev/tristan/fddl.git</code></pre>
<p>To run the REPL:</p>
<pre><code class="language-bash">cargo run</code></pre>
<p>To run a fddl script:</p>
<pre><code class="language-bash">cargo run path/to/script.fddl</code></pre>
<h2>Examples</h2>
<p>Your basic "hello, world":</p>
<pre><code class="language-rust">
func main() {
print(`hello, world in fddl`);
}
</code></pre>
<p>Defining a function inside a module, squaring a number:</p>
<pre><code class="language-rust">##! This is a sample module
module math {
### Computes the square of a number
func square(x) => x ^ 2;
}
define $number := 5;
print(`The square of $number is ${math.square($number)}`);</code></pre>
<p>(At least for right now.)</p>
<h2>License</h2>
<p>This project is licensed under the MIT License.</p>
<div class="notes">
<h2>Notes and Next Steps</h2>
<ul>
<li class="task-list-item"><input type="checkbox" checked disabled> Added first new set of tokens and features, added the first <code>lexer</code> tests.</li>
<li class="task-list-item"><input type="checkbox" disabled> <code>parser</code> module is a placeholder.</li>
<li class="task-list-item"><input type="checkbox" disabled> <code>interpreter</code> module is a placeholder.</li>
<li class="task-list-item"><input type="checkbox" disabled> Implement a more robust error handling mechanism instead of using <code>stderr</code>.</li>
<li class="task-list-item"><input type="checkbox" disabled> Implement string interpolation (backticks with <code>$variable</code>)</li>
<li class="task-list-item"><input type="checkbox" disabled> Continue to expand tests to cover all new syntax and features.</li>
<li class="task-list-item"><input type="checkbox" checked disabled> Made a crappy website.</li>
</ul>
</div>
<h2>Running the Project</h2>
<p>Make sure your project compiles and the tests pass:</p>
<pre><code class="language-bash">cargo build
cargo test</code></pre>
<div class="contact">
<p><a href="/cdn-cgi/l/email-protection#cabeb8a3b9beaba48aacaeaea6e4aeafbc">Contact</a></p>
<p><a href="https://git.fddl.dev/tristan/fddl">Git repo</a></p>
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