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Transcode into another format
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<h1>
<i class="fa fa-circle-o-notch fa-spin"></i>
<a href="." >Transcode into another format</a>
</h1>
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<h1 id="transcode-one-format-into-another"><a name="transcode-one-format-into-another" class="plugin-anchor" href="#transcode-one-format-into-another"><i class="fa fa-link" aria-hidden="true"></i></a>Transcode one format into another</h1>
<p>The <a href="https://github.com/sfackler/serde-transcode" target="_blank"><code>serde-transcode</code></a> crate
provides functionality to "transcode" from an arbitrary Serde <code>Deserializer</code> to
an arbitrary Serde <code>Serializer</code> without needing to collect the entire input into
an intermediate form in memory. This provides a fully general way to convert any
self-describing Serde data format into any other Serde data format in a
memory-efficient streaming way.</p>
<p>For example you could transcode a stream of JSON data into a stream of CBOR
data, or transcode unformatted JSON into its pretty-printed form.</p>
<p>This example implements the equivalent of Go's
<a href="https://golang.org/pkg/encoding/json/#Compact" target="_blank"><code>json.Compact</code></a> function which
removes insignificant whitespace from a JSON string in a streaming way.</p>
<pre><code class="lang-rust"><span class="hljs-keyword">use</span> std::io;
<span class="hljs-function"><span class="hljs-keyword">fn</span> <span class="hljs-title">main</span></span>() {
<span class="hljs-comment">// A JSON input with plenty of whitespace.</span>
<span class="hljs-keyword">let</span> input = r#<span class="hljs-string">"
{
"</span>a boolean<span class="hljs-string">": true,
"</span>an array<span class="hljs-string">": [3, 2, 1]
}
"</span>#;
<span class="hljs-comment">// A JSON deserializer. You can use any Serde Deserializer here.</span>
<span class="hljs-keyword">let</span> <span class="hljs-keyword">mut</span> deserializer = serde_json::Deserializer::from_str(input);
<span class="hljs-comment">// A compacted JSON serializer. You can use any Serde Serializer here.</span>
<span class="hljs-keyword">let</span> <span class="hljs-keyword">mut</span> serializer = serde_json::Serializer::new(io::stdout());
<span class="hljs-comment">// Prints `{"a boolean":true,"an array":[3,2,1]}` to stdout.</span>
<span class="hljs-comment">// This line works with any self-describing Deserializer and any Serializer.</span>
serde_transcode::transcode(&<span class="hljs-keyword">mut</span> deserializer, &<span class="hljs-keyword">mut</span> serializer).unwrap();
}
</code></pre>
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