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<a href="DocumentSemanticTokensProvider.html">DocumentSemanticTokensProvider</a>
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</ul>
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<h1>Interface DocumentSemanticTokensProvider</h1>
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</div>
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<p>The document semantic tokens provider interface defines the contract between extensions and
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semantic tokens.</p>
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</div>
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</div>
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</section>
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<section class="tsd-panel tsd-hierarchy">
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<h3>层级</h3>
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<ul class="tsd-hierarchy">
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<li>
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<span class="target">DocumentSemanticTokensProvider</span>
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</li>
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</ul>
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</section>
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<h2>索引</h2>
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<div class="tsd-index-content">
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<section class="tsd-index-section ">
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<h3>Properties（1）</h3>
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<ul class="tsd-index-list">
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<li class="tsd-kind-property tsd-parent-kind-interface"><a href="DocumentSemanticTokensProvider.html#onDidChangeSemanticTokens" class="tsd-kind-icon">on<wbr>Did<wbr>Change<wbr>Semantic<wbr>Tokens</a></li>
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</ul>
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</section>
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<section class="tsd-index-section ">
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<h3>Methods（2）</h3>
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<ul class="tsd-index-list">
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<li class="tsd-kind-method tsd-parent-kind-interface"><a href="DocumentSemanticTokensProvider.html#provideDocumentSemanticTokens" class="tsd-kind-icon">provide<wbr>Document<wbr>Semantic<wbr>Tokens</a></li>
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<li class="tsd-kind-method tsd-parent-kind-interface"><a href="DocumentSemanticTokensProvider.html#provideDocumentSemanticTokensEdits" class="tsd-kind-icon">provide<wbr>Document<wbr>Semantic<wbr>Tokens<wbr>Edits</a></li>
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</ul>
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</section>
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</div>
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</section>
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</section>
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<section class="tsd-panel-group tsd-member-group ">
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<h2>Properties（1）</h2>
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<section class="tsd-panel tsd-member tsd-kind-property tsd-parent-kind-interface">
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<a name="onDidChangeSemanticTokens" class="tsd-anchor"></a>
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<h3><span class="tsd-flag ts-flagOptional">Optional</span> on<wbr>Did<wbr>Change<wbr>Semantic<wbr>Tokens</h3>
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<div class="tsd-signature tsd-kind-icon">on<wbr>Did<wbr>Change<wbr>Semantic<wbr>Tokens<span class="tsd-signature-symbol">:</span> <a href="Event.html" class="tsd-signature-type" data-tsd-kind="Interface">Event</a><span class="tsd-signature-symbol"><</span><span class="tsd-signature-type">void</span><span class="tsd-signature-symbol">></span></div>
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<aside class="tsd-sources">
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<ul>
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<li>Defined in <a href="https://github.com/vscode-cn/vscode-api-cn/blob/060a294/vscode.d.ts#L3598">vscode.d.ts:3598</a></li>
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</ul>
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</aside>
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<div class="tsd-comment tsd-typography">
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<div class="lead">
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<p>An optional event to signal that the semantic tokens from this provider have changed.</p>
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</div>
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</div>
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</section>
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</section>
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<section class="tsd-panel-group tsd-member-group ">
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<h2>Methods（2）</h2>
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<section class="tsd-panel tsd-member tsd-kind-method tsd-parent-kind-interface">
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<a name="provideDocumentSemanticTokens" class="tsd-anchor"></a>
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<h3>provide<wbr>Document<wbr>Semantic<wbr>Tokens</h3>
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<ul class="tsd-signatures tsd-kind-method tsd-parent-kind-interface">
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<li class="tsd-signature tsd-kind-icon">provide<wbr>Document<wbr>Semantic<wbr>Tokens<span class="tsd-signature-symbol">(</span>document<span class="tsd-signature-symbol">: </span><a href="TextDocument.html" class="tsd-signature-type" data-tsd-kind="Interface">TextDocument</a>, token<span class="tsd-signature-symbol">: </span><a href="CancellationToken.html" class="tsd-signature-type" data-tsd-kind="Interface">CancellationToken</a><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><a href="../modules.html#ProviderResult" class="tsd-signature-type" data-tsd-kind="Type alias">ProviderResult</a><span class="tsd-signature-symbol"><</span><a href="../classes/SemanticTokens.html" class="tsd-signature-type" data-tsd-kind="Class">SemanticTokens</a><span class="tsd-signature-symbol">></span></li>
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</ul>
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<ul class="tsd-descriptions">
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<li class="tsd-description">
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<aside class="tsd-sources">
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<ul>
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<li>Defined in <a href="https://github.com/vscode-cn/vscode-api-cn/blob/060a294/vscode.d.ts#L3659">vscode.d.ts:3659</a></li>
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</ul>
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</aside>
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<div class="tsd-comment tsd-typography">
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<div class="lead">
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<p>Tokens in a file are represented as an array of integers. The position of each token is expressed relative to
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the token before it, because most tokens remain stable relative to each other when edits are made in a file.</p>
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</div>
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<hr>
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<p>In short, each token takes 5 integers to represent, so a specific token <code>i</code> in the file consists of the following array indices:</p>
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<ul>
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<li>at index <code>5*i</code> - <code>deltaLine</code>: token line number, relative to the previous token</li>
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<li>at index <code>5*i+1</code> - <code>deltaStart</code>: token start character, relative to the previous token (relative to 0 or the previous token's start if they are on the same line)</li>
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<li>at index <code>5*i+2</code> - <code>length</code>: the length of the token. A token cannot be multiline.</li>
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<li>at index <code>5*i+3</code> - <code>tokenType</code>: will be looked up in <code>SemanticTokensLegend.tokenTypes</code>. We currently ask that <code>tokenType</code> < 65536.</li>
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<li>at index <code>5*i+4</code> - <code>tokenModifiers</code>: each set bit will be looked up in <code>SemanticTokensLegend.tokenModifiers</code></li>
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</ul>
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<hr>
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<a href="#how-to-encode-tokens" id="how-to-encode-tokens" style="color: inherit; text-decoration: none;">
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<h3>How to encode tokens</h3>
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</a>
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<p>Here is an example for encoding a file with 3 tokens in a uint32 array:</p>
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<pre><code><span style="color: #000000"> { line: </span><span style="color: #098658">2</span><span style="color: #000000">, startChar: </span><span style="color: #098658">5</span><span style="color: #000000">, length: </span><span style="color: #098658">3</span><span style="color: #000000">, tokenType: </span><span style="color: #A31515">"property"</span><span style="color: #000000">, tokenModifiers: [</span><span style="color: #A31515">"private"</span><span style="color: #000000">, </span><span style="color: #A31515">"static"</span><span style="color: #000000">] },</span>
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<span style="color: #000000"> { line: </span><span style="color: #098658">2</span><span style="color: #000000">, startChar: </span><span style="color: #098658">10</span><span style="color: #000000">, length: </span><span style="color: #098658">4</span><span style="color: #000000">, tokenType: </span><span style="color: #A31515">"type"</span><span style="color: #000000">, tokenModifiers: [] },</span>
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<span style="color: #000000"> { line: </span><span style="color: #098658">5</span><span style="color: #000000">, startChar: </span><span style="color: #098658">2</span><span style="color: #000000">, length: </span><span style="color: #098658">7</span><span style="color: #000000">, tokenType: </span><span style="color: #A31515">"class"</span><span style="color: #000000">, tokenModifiers: [] }</span>
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</code></pre>
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<ol>
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<li><p>First of all, a legend must be devised. This legend must be provided up-front and capture all possible token types.
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For this example, we will choose the following legend which must be passed in when registering the provider:</p>
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<pre><code><span style="color: #000000">tokenTypes: [</span><span style="color: #A31515">'property'</span><span style="color: #000000">, </span><span style="color: #A31515">'type'</span><span style="color: #000000">, </span><span style="color: #A31515">'class'</span><span style="color: #000000">],</span>
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<span style="color: #000000">tokenModifiers: [</span><span style="color: #A31515">'private'</span><span style="color: #000000">, </span><span style="color: #A31515">'static'</span><span style="color: #000000">]</span>
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</code></pre>
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</li>
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<li><p>The first transformation step is to encode <code>tokenType</code> and <code>tokenModifiers</code> as integers using the legend. Token types are looked
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up by index, so a <code>tokenType</code> value of <code>1</code> means <code>tokenTypes[1]</code>. Multiple token modifiers can be set by using bit flags,
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so a <code>tokenModifier</code> value of <code>3</code> is first viewed as binary <code>0b00000011</code>, which means <code>[tokenModifiers[0], tokenModifiers[1]]</code> because
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bits 0 and 1 are set. Using this legend, the tokens now are:</p>
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<pre><code><span style="color: #000000">{ line: </span><span style="color: #098658">2</span><span style="color: #000000">, startChar: </span><span style="color: #098658">5</span><span style="color: #000000">, length: </span><span style="color: #098658">3</span><span style="color: #000000">, tokenType: </span><span style="color: #098658">0</span><span style="color: #000000">, tokenModifiers: </span><span style="color: #098658">3</span><span style="color: #000000"> },</span>
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<span style="color: #000000">{ line: </span><span style="color: #098658">2</span><span style="color: #000000">, startChar: </span><span style="color: #098658">10</span><span style="color: #000000">, length: </span><span style="color: #098658">4</span><span style="color: #000000">, tokenType: </span><span style="color: #098658">1</span><span style="color: #000000">, tokenModifiers: </span><span style="color: #098658">0</span><span style="color: #000000"> },</span>
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<span style="color: #000000">{ line: </span><span style="color: #098658">5</span><span style="color: #000000">, startChar: </span><span style="color: #098658">2</span><span style="color: #000000">, length: </span><span style="color: #098658">7</span><span style="color: #000000">, tokenType: </span><span style="color: #098658">2</span><span style="color: #000000">, tokenModifiers: </span><span style="color: #098658">0</span><span style="color: #000000"> }</span>
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</code></pre>
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</li>
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<li><p>The next step is to represent each token relative to the previous token in the file. In this case, the second token
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is on the same line as the first token, so the <code>startChar</code> of the second token is made relative to the <code>startChar</code>
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of the first token, so it will be <code>10 - 5</code>. The third token is on a different line than the second token, so the
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<code>startChar</code> of the third token will not be altered:</p>
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<pre><code><span style="color: #000000">{ deltaLine: </span><span style="color: #098658">2</span><span style="color: #000000">, deltaStartChar: </span><span style="color: #098658">5</span><span style="color: #000000">, length: </span><span style="color: #098658">3</span><span style="color: #000000">, tokenType: </span><span style="color: #098658">0</span><span style="color: #000000">, tokenModifiers: </span><span style="color: #098658">3</span><span style="color: #000000"> },</span>
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<span style="color: #000000">{ deltaLine: </span><span style="color: #098658">0</span><span style="color: #000000">, deltaStartChar: </span><span style="color: #098658">5</span><span style="color: #000000">, length: </span><span style="color: #098658">4</span><span style="color: #000000">, tokenType: </span><span style="color: #098658">1</span><span style="color: #000000">, tokenModifiers: </span><span style="color: #098658">0</span><span style="color: #000000"> },</span>
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<span style="color: #000000">{ deltaLine: </span><span style="color: #098658">3</span><span style="color: #000000">, deltaStartChar: </span><span style="color: #098658">2</span><span style="color: #000000">, length: </span><span style="color: #098658">7</span><span style="color: #000000">, tokenType: </span><span style="color: #098658">2</span><span style="color: #000000">, tokenModifiers: </span><span style="color: #098658">0</span><span style="color: #000000"> }</span>
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</code></pre>
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</li>
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<li><p>Finally, the last step is to inline each of the 5 fields for a token in a single array, which is a memory friendly representation:</p>
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<pre><code><span style="color: #008000">// 1st token, 2nd token, 3rd token</span>
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<span style="color: #000000">[ </span><span style="color: #098658">2</span><span style="color: #000000">,</span><span style="color: #098658">5</span><span style="color: #000000">,</span><span style="color: #098658">3</span><span style="color: #000000">,</span><span style="color: #098658">0</span><span style="color: #000000">,</span><span style="color: #098658">3</span><span style="color: #000000">, </span><span style="color: #098658">0</span><span style="color: #000000">,</span><span style="color: #098658">5</span><span style="color: #000000">,</span><span style="color: #098658">4</span><span style="color: #000000">,</span><span style="color: #098658">1</span><span style="color: #000000">,</span><span style="color: #098658">0</span><span style="color: #000000">, </span><span style="color: #098658">3</span><span style="color: #000000">,</span><span style="color: #098658">2</span><span style="color: #000000">,</span><span style="color: #098658">7</span><span style="color: #000000">,</span><span style="color: #098658">2</span><span style="color: #000000">,</span><span style="color: #098658">0</span><span style="color: #000000"> ]</span>
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</code></pre>
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</li>
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</ol>
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<dl class="tsd-comment-tags">
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<dt>see</dt>
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<dd><p><a href="../classes/SemanticTokensBuilder.html">SemanticTokensBuilder</a> for a helper to encode tokens as integers.
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<em>NOTE</em>: When doing edits, it is possible that multiple edits occur until the editor decides to invoke the semantic tokens provider.
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<em>NOTE</em>: If the provider cannot temporarily compute semantic tokens, it can indicate this by throwing an error with the message 'Busy'.</p>
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</dd>
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</dl>
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</div>
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<h4 class="tsd-parameters-title">Parameters</h4>
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<ul class="tsd-parameters">
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<li>
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<h5>document: <a href="TextDocument.html" class="tsd-signature-type" data-tsd-kind="Interface">TextDocument</a></h5>
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</li>
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<li>
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<h5>token: <a href="CancellationToken.html" class="tsd-signature-type" data-tsd-kind="Interface">CancellationToken</a></h5>
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</li>
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</ul>
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<h4 class="tsd-returns-title">Returns <a href="../modules.html#ProviderResult" class="tsd-signature-type" data-tsd-kind="Type alias">ProviderResult</a><span class="tsd-signature-symbol"><</span><a href="../classes/SemanticTokens.html" class="tsd-signature-type" data-tsd-kind="Class">SemanticTokens</a><span class="tsd-signature-symbol">></span></h4>
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</li>
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</ul>
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</section>
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<section class="tsd-panel tsd-member tsd-kind-method tsd-parent-kind-interface">
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<a name="provideDocumentSemanticTokensEdits" class="tsd-anchor"></a>
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<h3><span class="tsd-flag ts-flagOptional">Optional</span> provide<wbr>Document<wbr>Semantic<wbr>Tokens<wbr>Edits</h3>
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<ul class="tsd-signatures tsd-kind-method tsd-parent-kind-interface">
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<li class="tsd-signature tsd-kind-icon">provide<wbr>Document<wbr>Semantic<wbr>Tokens<wbr>Edits<span class="tsd-signature-symbol">(</span>document<span class="tsd-signature-symbol">: </span><a href="TextDocument.html" class="tsd-signature-type" data-tsd-kind="Interface">TextDocument</a>, previousResultId<span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">string</span>, token<span class="tsd-signature-symbol">: </span><a href="CancellationToken.html" class="tsd-signature-type" data-tsd-kind="Interface">CancellationToken</a><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><a href="../modules.html#ProviderResult" class="tsd-signature-type" data-tsd-kind="Type alias">ProviderResult</a><span class="tsd-signature-symbol"><</span><a href="../classes/SemanticTokens.html" class="tsd-signature-type" data-tsd-kind="Class">SemanticTokens</a><span class="tsd-signature-symbol"> | </span><a href="../classes/SemanticTokensEdits.html" class="tsd-signature-type" data-tsd-kind="Class">SemanticTokensEdits</a><span class="tsd-signature-symbol">></span></li>
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</ul>
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<ul class="tsd-descriptions">
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<li class="tsd-description">
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<aside class="tsd-sources">
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<ul>
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<li>Defined in <a href="https://github.com/vscode-cn/vscode-api-cn/blob/060a294/vscode.d.ts#L3690">vscode.d.ts:3690</a></li>
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</ul>
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</aside>
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<div class="tsd-comment tsd-typography">
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<div class="lead">
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<p>Instead of always returning all the tokens in a file, it is possible for a <code>DocumentSemanticTokensProvider</code> to implement
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this method (<code>provideDocumentSemanticTokensEdits</code>) and then return incremental updates to the previously provided semantic tokens.</p>
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</div>
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<hr>
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<a href="#how-tokens-change-when-the-document-changes" id="how-tokens-change-when-the-document-changes" style="color: inherit; text-decoration: none;">
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<h3>How tokens change when the document changes</h3>
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</a>
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<p>Suppose that <code>provideDocumentSemanticTokens</code> has previously returned the following semantic tokens:</p>
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<pre><code><span style="color: #000000"> </span><span style="color: #008000">// 1st token, 2nd token, 3rd token</span>
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<span style="color: #000000"> [ </span><span style="color: #098658">2</span><span style="color: #000000">,</span><span style="color: #098658">5</span><span style="color: #000000">,</span><span style="color: #098658">3</span><span style="color: #000000">,</span><span style="color: #098658">0</span><span style="color: #000000">,</span><span style="color: #098658">3</span><span style="color: #000000">, </span><span style="color: #098658">0</span><span style="color: #000000">,</span><span style="color: #098658">5</span><span style="color: #000000">,</span><span style="color: #098658">4</span><span style="color: #000000">,</span><span style="color: #098658">1</span><span style="color: #000000">,</span><span style="color: #098658">0</span><span style="color: #000000">, </span><span style="color: #098658">3</span><span style="color: #000000">,</span><span style="color: #098658">2</span><span style="color: #000000">,</span><span style="color: #098658">7</span><span style="color: #000000">,</span><span style="color: #098658">2</span><span style="color: #000000">,</span><span style="color: #098658">0</span><span style="color: #000000"> ]</span>
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</code></pre>
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<p>Also suppose that after some edits, the new semantic tokens in a file are:</p>
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<pre><code><span style="color: #000000"> </span><span style="color: #008000">// 1st token, 2nd token, 3rd token</span>
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<span style="color: #000000"> [ </span><span style="color: #098658">3</span><span style="color: #000000">,</span><span style="color: #098658">5</span><span style="color: #000000">,</span><span style="color: #098658">3</span><span style="color: #000000">,</span><span style="color: #098658">0</span><span style="color: #000000">,</span><span style="color: #098658">3</span><span style="color: #000000">, </span><span style="color: #098658">0</span><span style="color: #000000">,</span><span style="color: #098658">5</span><span style="color: #000000">,</span><span style="color: #098658">4</span><span style="color: #000000">,</span><span style="color: #098658">1</span><span style="color: #000000">,</span><span style="color: #098658">0</span><span style="color: #000000">, </span><span style="color: #098658">3</span><span style="color: #000000">,</span><span style="color: #098658">2</span><span style="color: #000000">,</span><span style="color: #098658">7</span><span style="color: #000000">,</span><span style="color: #098658">2</span><span style="color: #000000">,</span><span style="color: #098658">0</span><span style="color: #000000"> ]</span>
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</code></pre>
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<p>It is possible to express these new tokens in terms of an edit applied to the previous tokens:</p>
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<pre><code><span style="color: #000000"> [ </span><span style="color: #098658">2</span><span style="color: #000000">,</span><span style="color: #098658">5</span><span style="color: #000000">,</span><span style="color: #098658">3</span><span style="color: #000000">,</span><span style="color: #098658">0</span><span style="color: #000000">,</span><span style="color: #098658">3</span><span style="color: #000000">, </span><span style="color: #098658">0</span><span style="color: #000000">,</span><span style="color: #098658">5</span><span style="color: #000000">,</span><span style="color: #098658">4</span><span style="color: #000000">,</span><span style="color: #098658">1</span><span style="color: #000000">,</span><span style="color: #098658">0</span><span style="color: #000000">, </span><span style="color: #098658">3</span><span style="color: #000000">,</span><span style="color: #098658">2</span><span style="color: #000000">,</span><span style="color: #098658">7</span><span style="color: #000000">,</span><span style="color: #098658">2</span><span style="color: #000000">,</span><span style="color: #098658">0</span><span style="color: #000000"> ] </span><span style="color: #008000">// old tokens</span>
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<span style="color: #000000"> [ </span><span style="color: #098658">3</span><span style="color: #000000">,</span><span style="color: #098658">5</span><span style="color: #000000">,</span><span style="color: #098658">3</span><span style="color: #000000">,</span><span style="color: #098658">0</span><span style="color: #000000">,</span><span style="color: #098658">3</span><span style="color: #000000">, </span><span style="color: #098658">0</span><span style="color: #000000">,</span><span style="color: #098658">5</span><span style="color: #000000">,</span><span style="color: #098658">4</span><span style="color: #000000">,</span><span style="color: #098658">1</span><span style="color: #000000">,</span><span style="color: #098658">0</span><span style="color: #000000">, </span><span style="color: #098658">3</span><span style="color: #000000">,</span><span style="color: #098658">2</span><span style="color: #000000">,</span><span style="color: #098658">7</span><span style="color: #000000">,</span><span style="color: #098658">2</span><span style="color: #000000">,</span><span style="color: #098658">0</span><span style="color: #000000"> ] </span><span style="color: #008000">// new tokens</span>
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<span style="color: #000000"> edit: { start: </span><span style="color: #098658">0</span><span style="color: #000000">, deleteCount: </span><span style="color: #098658">1</span><span style="color: #000000">, data: [</span><span style="color: #098658">3</span><span style="color: #000000">] } </span><span style="color: #008000">// replace integer at offset 0 with 3</span>
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</code></pre>
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<p><em>NOTE</em>: If the provider cannot compute <code>SemanticTokensEdits</code>, it can "give up" and return all the tokens in the document again.
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<em>NOTE</em>: All edits in <code>SemanticTokensEdits</code> contain indices in the old integers array, so they all refer to the previous result state.</p>
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</div>
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<h4 class="tsd-parameters-title">Parameters</h4>
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<ul class="tsd-parameters">
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<li>
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<h5>document: <a href="TextDocument.html" class="tsd-signature-type" data-tsd-kind="Interface">TextDocument</a></h5>
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</li>
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<li>
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<h5>previousResultId: <span class="tsd-signature-type">string</span></h5>
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</li>
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<li>
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<h5>token: <a href="CancellationToken.html" class="tsd-signature-type" data-tsd-kind="Interface">CancellationToken</a></h5>
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</li>
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</ul>
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<h4 class="tsd-returns-title">Returns <a href="../modules.html#ProviderResult" class="tsd-signature-type" data-tsd-kind="Type alias">ProviderResult</a><span class="tsd-signature-symbol"><</span><a href="../classes/SemanticTokens.html" class="tsd-signature-type" data-tsd-kind="Class">SemanticTokens</a><span class="tsd-signature-symbol"> | </span><a href="../classes/SemanticTokensEdits.html" class="tsd-signature-type" data-tsd-kind="Class">SemanticTokensEdits</a><span class="tsd-signature-symbol">></span></h4>
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</ul>
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<a href="DocumentSemanticTokensProvider.html" class="tsd-kind-icon">Document<wbr>Semantic<wbr>Tokens<wbr>Provider</a>
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<a href="DocumentSemanticTokensProvider.html#onDidChangeSemanticTokens" class="tsd-kind-icon">on<wbr>Did<wbr>Change<wbr>Semantic<wbr>Tokens</a>
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<li class=" tsd-kind-method tsd-parent-kind-interface">
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<a href="DocumentSemanticTokensProvider.html#provideDocumentSemanticTokensEdits" class="tsd-kind-icon">provide<wbr>Document<wbr>Semantic<wbr>Tokens<wbr>Edits</a>
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