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<h1 id="scheme-rs-embedded-scheme-for-the-rust-ecosystem">Scheme-rs: Embedded Scheme for the Rust Ecosystem<a class="headerlink" href="#scheme-rs-embedded-scheme-for-the-rust-ecosystem" title="Permanent link">¶</a></h1>
<p><a href="https://github.com/maplant/scheme-rs"><img alt="github" src="https://img.shields.io/badge/github-maplant/scheme--rs-8da0cb?style=for-the-badge&labelColor=555555&logo=github" height="20"></a>
<a href="https://crates.io/crates/scheme-rs"><img alt="crates.io" src="https://img.shields.io/crates/v/scheme-rs.svg?style=for-the-badge&color=fc8d62&logo=rust" height="20"></a>
<a href="https://docs.rs/scheme-rs"><img alt="docs.rs" src="https://img.shields.io/badge/docs.rs-scheme--rs-66c2a5?style=for-the-badge&labelColor=555555&logo=docs.rs" height="20"></a></p>
<p>Scheme-rs is an implementation of the
<a href="https://www.r6rs.org/final/r6rs.pdf">R6RS</a> specification of the <a href="https://en.wikipedia.org/wiki/Scheme_(programming_language)">Scheme programming
language</a> that is
designed to be embedded within sync and async Rust.</p>
<div class="language-scheme highlight"><pre><span></span><code><span id="__span-0-1"><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a><span class="c1">;; Example of a program that defines a variable via a datum received over a </span>
</span><span id="__span-0-2"><a id="__codelineno-0-2" name="__codelineno-0-2" href="#__codelineno-0-2"></a><span class="c1">;; socket.</span>
</span><span id="__span-0-3"><a id="__codelineno-0-3" name="__codelineno-0-3" href="#__codelineno-0-3"></a><span class="c1">;; </span>
</span><span id="__span-0-4"><a id="__codelineno-0-4" name="__codelineno-0-4" href="#__codelineno-0-4"></a><span class="c1">;; Requires the `async` and `tokio` features enabled.</span>
</span><span id="__span-0-5"><a id="__codelineno-0-5" name="__codelineno-0-5" href="#__codelineno-0-5"></a>
</span><span id="__span-0-6"><a id="__codelineno-0-6" name="__codelineno-0-6" href="#__codelineno-0-6"></a><span class="p">(</span><span class="k">import</span><span class="w"> </span><span class="p">(</span><span class="nf">rnrs</span><span class="p">)</span><span class="w"> </span><span class="p">(</span><span class="nf">async</span><span class="p">))</span>
</span><span id="__span-0-7"><a id="__codelineno-0-7" name="__codelineno-0-7" href="#__codelineno-0-7"></a>
</span><span id="__span-0-8"><a id="__codelineno-0-8" name="__codelineno-0-8" href="#__codelineno-0-8"></a><span class="p">(</span><span class="k">define-syntax</span><span class="w"> </span><span class="nv">expand-from-socket</span>
</span><span id="__span-0-9"><a id="__codelineno-0-9" name="__codelineno-0-9" href="#__codelineno-0-9"></a><span class="w"> </span><span class="p">(</span><span class="k">lambda</span><span class="w"> </span><span class="p">(</span><span class="nf">x</span><span class="p">)</span>
</span><span id="__span-0-10"><a id="__codelineno-0-10" name="__codelineno-0-10" href="#__codelineno-0-10"></a><span class="w"> </span><span class="p">(</span><span class="k">syntax-case</span><span class="w"> </span><span class="nv">x</span><span class="w"> </span><span class="p">()</span>
</span><span id="__span-0-11"><a id="__codelineno-0-11" name="__codelineno-0-11" href="#__codelineno-0-11"></a><span class="w"> </span><span class="p">[(</span><span class="nf">ctxt</span><span class="p">)</span>
</span><span id="__span-0-12"><a id="__codelineno-0-12" name="__codelineno-0-12" href="#__codelineno-0-12"></a><span class="w"> </span><span class="p">(</span><span class="k">let</span><span class="w"> </span><span class="p">([</span><span class="nv">listener</span><span class="w"> </span><span class="p">(</span><span class="nf">bind-tcp</span><span class="w"> </span><span class="s">"0.0.0.0:8080"</span><span class="p">)])</span>
</span><span id="__span-0-13"><a id="__codelineno-0-13" name="__codelineno-0-13" href="#__codelineno-0-13"></a><span class="w"> </span><span class="p">(</span><span class="k">let-values</span><span class="w"> </span><span class="p">([(</span><span class="nf">port</span><span class="w"> </span><span class="nv">addr</span><span class="p">)</span><span class="w"> </span><span class="p">(</span><span class="nb">accept</span><span class="w"> </span><span class="nv">listener</span><span class="p">)])</span>
</span><span id="__span-0-14"><a id="__codelineno-0-14" name="__codelineno-0-14" href="#__codelineno-0-14"></a><span class="w"> </span><span class="p">(</span><span class="k">let*</span><span class="w"> </span><span class="p">([</span><span class="nv">port</span><span class="w"> </span><span class="p">(</span><span class="nf">transcoded-port</span><span class="w"> </span><span class="nv">port</span><span class="w"> </span><span class="p">(</span><span class="nf">native-transcoder</span><span class="p">))]</span>
</span><span id="__span-0-15"><a id="__codelineno-0-15" name="__codelineno-0-15" href="#__codelineno-0-15"></a><span class="w"> </span><span class="p">[</span><span class="nv">recvd-syntax</span><span class="w"> </span><span class="p">(</span><span class="nb">datum->syntax</span><span class="w"> </span><span class="o">#</span><span class="ss">'ctxt</span><span class="w"> </span><span class="p">(</span><span class="nf">get-datum</span><span class="w"> </span><span class="nv">port</span><span class="p">))])</span>
</span><span id="__span-0-16"><a id="__codelineno-0-16" name="__codelineno-0-16" href="#__codelineno-0-16"></a><span class="w"> </span><span class="p">(</span><span class="nb">write</span><span class="w"> </span><span class="ss">'thanks!</span><span class="w"> </span><span class="nv">port</span><span class="p">)</span>
</span><span id="__span-0-17"><a id="__codelineno-0-17" name="__codelineno-0-17" href="#__codelineno-0-17"></a><span class="w"> </span><span class="p">(</span><span class="nb">close-port</span><span class="w"> </span><span class="nv">port</span><span class="p">)</span>
</span><span id="__span-0-18"><a id="__codelineno-0-18" name="__codelineno-0-18" href="#__codelineno-0-18"></a><span class="w"> </span><span class="nv">recvd-syntax</span><span class="p">)))])))</span>
</span><span id="__span-0-19"><a id="__codelineno-0-19" name="__codelineno-0-19" href="#__codelineno-0-19"></a>
</span><span id="__span-0-20"><a id="__codelineno-0-20" name="__codelineno-0-20" href="#__codelineno-0-20"></a><span class="p">(</span><span class="k">define</span><span class="w"> </span><span class="nv">var-from-network</span><span class="w"> </span><span class="p">(</span><span class="nf">expand-from-socket</span><span class="p">))</span>
</span></code></pre></div>
<h2 id="features">Features:<a class="headerlink" href="#features" title="Permanent link">¶</a></h2>
<ul>
<li><strong>Modern</strong>: scheme-rs is a modern scheme implementation of the R6RS standard and includes
advanced features such as <a href="https://en.wikipedia.org/wiki/Delimited_continuation">delimited continuations</a>.</li>
<li><strong>Fast</strong>: scheme-rs uses JIT compilation to provide performance on par with
other modern scheme implementations.</li>
<li><strong>Easy to use</strong>: scheme-rs makes it trivial to define Rust functions and data
structures that are accessible from scheme code and vice-versa.</li>
<li><strong>Safe</strong>: scheme-rs provides a completely safe API that is impossible to
misuse.</li>
<li><strong>Supports both async and sync Rust</strong>: by enabling the <code>async</code> feature flag
it becomes possible (and easy) to define async scheme functions in Rust. </li>
</ul>
<h2 id="getting-started">Getting started:<a class="headerlink" href="#getting-started" title="Permanent link">¶</a></h2>
<p>For embedding scheme-rs in your Rust project, <a href="https://docs.rs/scheme-rs/latest/scheme_rs/">take a look at the API documentation</a>.</p>
<p>For installing scheme-rs as a standalone executable, cargo can be used:</p>
<div class="language-console highlight"><pre><span></span><code><span id="__span-1-1"><a id="__codelineno-1-1" name="__codelineno-1-1" href="#__codelineno-1-1"></a><span class="gp">$ </span>cargo<span class="w"> </span>install<span class="w"> </span>scheme-rs<span class="w"> </span>
</span></code></pre></div>
<p>To enable async features, install with the <code>async</code> and <code>tokio</code> features:</p>
<div class="language-console highlight"><pre><span></span><code><span id="__span-2-1"><a id="__codelineno-2-1" name="__codelineno-2-1" href="#__codelineno-2-1"></a><span class="gp">$ </span>cargo<span class="w"> </span>install<span class="w"> </span>scheme-rs<span class="w"> </span>--features<span class="w"> </span><span class="s2">"async,tokio"</span>
</span></code></pre></div>
<h2 id="supported-platforms">Supported platforms:<a class="headerlink" href="#supported-platforms" title="Permanent link">¶</a></h2>
<p>scheme-rs uses <a href="https://cranelift.dev">cranelift</a> for JIT compilation and is therefore
limited to platforms supported by cranelift. At the current moment that includes
x86-64, aarch64 (ARM64), s390x (IBM Z), and riscv64 architectures.</p>
<p>scheme-rs has been tested on the following platforms:</p>
<ul>
<li>Linux (fully supported, primary platform)</li>
<li>MacOs (occasionally tested)</li>
<li>Windows (previously tested, not tested in a while)</li>
</ul>
<h2 id="documentation">Documentation<a class="headerlink" href="#documentation" title="Permanent link">¶</a></h2>
<ul>
<li><a href="https://docs.rs/scheme-rs/latest/scheme_rs/">API documentation</a></li>
<li><a href="./Language Reference/">Language reference</a></li>
</ul>
<h2 id="contributing">Contributing<a class="headerlink" href="#contributing" title="Permanent link">¶</a></h2>
<p>If you have any questions or comments about the project, feel free to join
<a href="https://discord.gg/sR4TttzGv5">the scheme-rs discord server</a>.</p>
</article>
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