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data-v-53c99d69><!--[--><!--]--></ul></div></nav><!--[--><!--]--><div class="spacer" data-v-cb998dce></div><!--[--><!--]--><!----><!--[--><!--]--><!--[--><!--]--></div></div></div></div><div class="content" data-v-e6f2a212><div class="content-container" data-v-e6f2a212><!--[--><!--]--><main class="main" data-v-e6f2a212><div style="position:relative;" class="vp-doc _design_protocol" data-v-e6f2a212><div><p>This file dictionary mainly describes the <a href="https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/" target="_blank" rel="noreferrer">Language Server Protocol Specification</a>. Every interface in the protocol is defined as corresponding struct.</p><p>For example, <a href="https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#position" target="_blank" rel="noreferrer">Position</a> has the following definition in the protocol:</p><div class="language-typescript vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">typescript</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">interface</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> Position</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> {</span></span>
<span class="line"><span style="--shiki-light:#E36209;--shiki-dark:#FFAB70;"> line</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">:</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> uinteger</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">;</span></span>
<span class="line"><span style="--shiki-light:#E36209;--shiki-dark:#FFAB70;"> character</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">:</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> uinteger</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">;</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">}</span></span></code></pre></div><p>then the corresponding representation in C++ is:</p><div class="language-cpp vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">cpp</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">struct</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> Position</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> {</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> uinteger line;</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> uinteger character;</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">};</span></span></code></pre></div><p>We use template meta programming to reflect the protocol type so that the serialization and deserialization can be done automatically. The trick is only suitable for type which is aggregate and default constructible and does not have base classes. But there are many types in the protocol which are defined through inheritance. For example, <a href="https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#declarationParams" target="_blank" rel="noreferrer">DeclarationParams</a> is defined as:</p><div class="language-typescript vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">typescript</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">export</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> interface</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> DeclarationParams</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> extends</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> TextDocumentPositionParams</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">,</span></span>
<span class="line"><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> WorkDoneProgressParams</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">, </span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">PartialResultParams</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> {</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">}</span></span></code></pre></div><p>We use <code>Combine</code> to resolve the problem. <code>Combine</code> is defined as:</p><div class="language-cpp vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">cpp</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">template</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">&lt;</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">typename</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">... </span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">Ts</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">&gt;</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">struct</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> Combine</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> : Ts... {};</span></span></code></pre></div><p>Then <code>DeclarationParams</code> can be defined as:</p><div class="language-cpp vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">cpp</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">using</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> DeclarationParams</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> =</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> Combine</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">&lt;</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> TextDocumentPositionParams, </span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> WorkDoneProgressParams, </span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> PartialResultParams</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">&gt;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">;</span></span></code></pre></div><p>Compared to direct inheritance, this way allows us to get the base class types of <code>DeclarationParams</code>. If the interface also has data members, you should define a struct to hold the data members separately and add it to <code>Combine</code> list.</p><p>For example, we have <a href="https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#referenceParams" target="_blank" rel="noreferrer">ReferenceParams</a> definition as follow:</p><div class="language-typescript vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">typescript</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">export</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> interface</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> ReferenceParams</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> extends</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> TextDocumentPositionParams</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">,</span></span>
<span class="line"><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> WorkDoneProgressParams</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">, </span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">PartialResultParams</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> {</span></span>
<span class="line"><span style="--shiki-light:#E36209;--shiki-dark:#FFAB70;"> context</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">:</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> ReferenceContext</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">;</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">}</span></span></code></pre></div><p>Then we can define <code>ReferenceParams</code> as:</p><div class="language-cpp vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">cpp</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">struct</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> ReferenceParamsBody</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> {</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> ReferenceContext context;</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">};</span></span>
<span class="line"></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">using</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> ReferenceParams</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> =</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> Combine</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">&lt;</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> TextDocumentPositionParams, </span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> WorkDoneProgressParams, </span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> PartialResultParams,</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> ReferenceParamsBody</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">&gt;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">;</span></span></code></pre></div><p>For number enum in TypeScript, it can define as corresponding <code>enum</code> in C++ directly, for string enum, we define it as <code>struct</code> with <code>static</code> members.</p><div class="language-typescript vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">typescript</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">export</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> namespace</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> MarkupKind</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> {</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> export</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> const</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> PlainText</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">:</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> &#39;plaintext&#39;</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> =</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> &#39;plaintext&#39;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">;</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> export</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> const</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> Markdown</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">:</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> &#39;markdown&#39;</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> =</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> &#39;markdown&#39;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">;</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">}</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">export</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> type</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> MarkupKind</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> =</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> &#39;plaintext&#39;</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> |</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> &#39;markdown&#39;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">;</span></span></code></pre></div><div class="language-cpp vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">cpp</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">struct</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> MarkupKind</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> {</span></span>
<span class="line"><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> std</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">::string_view m_value;</span></span>
<span class="line"></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> constexpr</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> MarkupKind</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">std</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">::</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">string_view</span><span style="--shiki-light:#E36209;--shiki-dark:#FFAB70;"> value</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">) : </span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">m_value</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(value) {}</span></span>
<span class="line"></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> constexpr</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> inline</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> static</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> std</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">::string_view PlainText </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> &quot;plaintext&quot;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">;</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> constexpr</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> inline</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> static</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> std</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">::string_view Markdown </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> &quot;markdown&quot;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">;</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">};</span></span></code></pre></div></div></div></main><footer class="VPDocFooter" data-v-e6f2a212 data-v-1bcd8184><!--[--><!--]--><!----><nav class="prev-next" aria-labelledby="doc-footer-aria-label" data-v-1bcd8184><span class="visually-hidden" id="doc-footer-aria-label" data-v-1bcd8184>Pager</span><div class="pager" data-v-1bcd8184><!----></div><div class="pager" data-v-1bcd8184><a class="VPLink link pager-link next" href="/guide.html" data-v-1bcd8184><!--[--><span class="desc" data-v-1bcd8184>Next page</span><span class="title" data-v-1bcd8184>Guide</span><!--]--></a></div></nav></footer><!--[--><!--]--></div></div></div><!--[--><!--]--></div></div><!----><!--[--><!--]--></div></div>
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