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<h1 class="page">Adding support for a new language</h1>
<div class="paragraph">
<p>This section describes how to add support for a new language into Eclipse&#160;Che.</p>
</div>
<div class="paragraph">
<p>The described method is to write a Che-Theia plug-in that uses the <em>languageserver-node</em> library to connect a language server to the VS Code extension API. Note that it is also possible to directly connect a Che-Theia plug-in or a VS Code extension to the plug-in API.</p>
</div>
<div class="ulist">
<div class="title">Prerequisites</div>
<ul>
<li>
<p>Install the latest Che-Theia plug-in Yeoman generator. Follow the documentation about <a href="../developing-che-theia-plug-ins/" class="page">Developing Che-Theia plug-ins</a>.</p>
</li>
</ul>
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<div class="olist arabic">
<div class="title">Procedure</div>
<ol class="arabic">
<li>
<p>Generate a sample by running the <code>yo @theia/plugin</code> command. When prompted, confirm the choices for <strong>Backend plug-in</strong>, <strong>Samples</strong>, and then <strong>Language sample</strong>. This creates a project and a ready-to-use plug-in, which provides support for XML Language Server and can be deployed.</p>
</li>
<li>
<p>Replace the download URL of the implementation of the language server protocol in the <code>src/download-xml-ls.js</code> file. This file will be downloaded during the build process of the plug-in. If the name of <code>src/download-xml-ls.js</code> changed, replace it in the <code>package.json</code> file in the <code>scripts</code> block.</p>
</li>
<li>
<p>Replace the configuration of the language in the <code>src/language-configuration.json</code> file. This file contains configuration options for the current language. If the name of <code>src/language-configuration.json</code> changed, replace it in the <code>package.json</code> file in the <code>contribution</code> block.</p>
</li>
<li>
<p>Replace the configuration of the language in the <code>src/xml.tmLanguage.json</code> file. This file describes syntax highlighting. If the name of <code>src/xml.tmLanguage.json</code> changed, replace it in the <code>package.json</code> file in the <code>contribution.grammars</code> block.</p>
</li>
<li>
<p>Replace the information about the provided language in the <code>src/plug-in_name.ts</code> file. This file contains information about the location of the Language Server Protocol (LSP) implementation and the command with arguments to run it.</p>
</li>
<li>
<p>Build the plug-in by running <code>yarn</code> in the root of the project.</p>
</li>
</ol>
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<div class="ulist">
<div class="title">Additional resources</div>
<ul>
<li>
<p><a href="https://github.com/eclipse/che-theia-samples/tree/master/samples/xml-language-server-plugin">Theia plug-in with XML Language Server</a></p>
</li>
<li>
<p><a href="https://microsoft.github.io/language-server-protocol/">Language Server Protocol</a></p>
</li>
<li>
<p><a href="https://code.visualstudio.com/api/language-extensions/overview">VS Code Language Extensions Documentation</a></p>
</li>
<li>
<p><a href="https://code.visualstudio.com/api/language-extensions/language-server-extension-guide">A simple Language Server for plain text files</a></p>
</li>
<li>
<p><a href="../publishing-che-theia-plug-ins/" class="page">Publishing Che-Theia plug-ins</a></p>
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