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<h1 class="article-title" itemprop="name">同步和异步</h1>
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<a target="_blank" rel="noopener external nofollow noreferrer" href="https://github.com/harttle/liquidjs/edit/master/docs/source/zh-cn/tutorials/sync-and-async.md" class="article-edit-link" title="改进这篇文档"><i class="icon-pencil"></i></a>
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<p>LiquidJS 支持同步调用也支持异步调用，支持 Promise。为了同异步复用一套标签和过滤器，LiquidJS 标签用生成器来实现。</p>
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<h2 id="同异步-API" class="article-heading"><a href="#同异步-API" class="headerlink" title="同异步 API"></a>同异步 API<a class="article-anchor" href="#同异步-API" aria-hidden="true"></a></h2><p><a href="/api/classes/Liquid.html">Liquid</a> 上主要的方法都支持同步和异步，下面这些方法返回 <code>Promise</code>：</p>
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<ul>
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<li><code>render()</code></li>
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<li><code>renderFile()</code></li>
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<li><code>parseFile()</code></li>
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<li><code>parseAndRender()</code></li>
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<li><code>evalValue()</code></li>
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</ul>
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<p>它们的同步版本带一个 <code>Sync</code> 后缀：</p>
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<ul>
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<li><code>renderSync()</code></li>
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<li><code>renderFileSync()</code></li>
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<li><code>parseFileSync()</code></li>
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<li><code>parseAndRenderSync()</code></li>
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<li><code>evalValueSync()</code></li>
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</ul>
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<h2 id="如何实现兼容同步的标签" class="article-heading"><a href="#如何实现兼容同步的标签" class="headerlink" title="如何实现兼容同步的标签"></a>如何实现兼容同步的标签<a class="article-anchor" href="#如何实现兼容同步的标签" aria-hidden="true"></a></h2><p>LiquidJS 使用基于生成器的异步实现，来让同一份代码支持同步和异步调用。例如下面的 <code>UpperTag</code> 既可以用于 <code>engine.renderSync()</code> 也可以用于 <code>engine.render()</code>：</p>
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<figure class="highlight typescript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span> { <span class="title class_">TagToken</span>, <span class="title class_">Context</span>, <span class="title class_">Emitter</span>, <span class="title class_">TopLevelToken</span>, <span class="title class_">Value</span>, <span class="title class_">Tag</span>, <span class="title class_">Liquid</span> } <span class="keyword">from</span> <span class="string">'liquidjs'</span></span><br><span class="line"></span><br><span class="line"><span class="comment">// Usage: {% upper "alice" %}</span></span><br><span class="line"><span class="comment">// Output: ALICE</span></span><br><span class="line">engine.<span class="title function_">registerTag</span>(<span class="string">'upper'</span>, <span class="keyword">class</span> <span class="title class_">UpperTag</span> <span class="keyword">extends</span> <span class="title class_ inherited__">Tag</span> {</span><br><span class="line"> <span class="keyword">private</span> <span class="attr">value</span>: <span class="title class_">Value</span></span><br><span class="line"> <span class="title function_">constructor</span> (<span class="params"><span class="attr">token</span>: <span class="title class_">TagToken</span>, <span class="attr">remainTokens</span>: <span class="title class_">TopLevelToken</span>[], <span class="attr">liquid</span>: <span class="title class_">Liquid</span></span>) {</span><br><span class="line"> <span class="variable language_">super</span>(token, remainTokens, liquid)</span><br><span class="line"> <span class="variable language_">this</span>.<span class="property">value</span> = <span class="keyword">new</span> <span class="title class_">Value</span>(token.<span class="property">args</span>, liquid)</span><br><span class="line"> }</span><br><span class="line"> * <span class="title function_">render</span> (<span class="attr">ctx</span>: <span class="title class_">Context</span>, <span class="attr">emitter</span>: <span class="title class_">Emitter</span>) {</span><br><span class="line"> <span class="keyword">const</span> title = <span class="keyword">yield</span> <span class="variable language_">this</span>.<span class="property">value</span>.<span class="title function_">value</span>(ctx)</span><br><span class="line"> emitter.<span class="title function_">write</span>(title.<span class="title function_">toUpperCase</span>())</span><br><span class="line"> }</span><br><span class="line">})</span><br></pre></td></tr></table></figure>
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<p>所有内置标签都兼容同步，可以安全地用于同步或异步 API。实现同时支持同异步的标签，需要：</p>
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<ul>
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<li>render 函数声明成 <code>* render()</code>，并且在里面</li>
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<li>不能直接 <code>return <Promise></code>，</li>
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<li>不能调用会返回 Promise 的函数。</li>
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</ul>
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<h2 id="调用返回-Promise-的函数" class="article-heading"><a href="#调用返回-Promise-的函数" class="headerlink" title="调用返回 Promise 的函数"></a>调用返回 Promise 的函数<a class="article-anchor" href="#调用返回-Promise-的函数" aria-hidden="true"></a></h2><p>但 LiquidJS 是支持 <code>Promise</code> 的，你仍然可以调用返回 <code>Promise</code> 的方法并等它 resolve。只需要把 <code>await</code> 换成 <code>yield</code>。例如：</p>
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<figure class="highlight typescript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">* <span class="title function_">render</span> (<span class="attr">ctx</span>: <span class="title class_">Context</span>, <span class="attr">emitter</span>: <span class="title class_">Emitter</span>) {</span><br><span class="line"> <span class="keyword">const</span> file = <span class="keyword">yield</span> <span class="variable language_">this</span>.<span class="property">value</span>.<span class="title function_">value</span>(ctx)</span><br><span class="line"> <span class="keyword">const</span> title = <span class="keyword">yield</span> fs.<span class="title function_">readFile</span>(file, <span class="string">'utf8'</span>)</span><br><span class="line"> emitter.<span class="title function_">write</span>(title.<span class="title function_">toUpperCase</span>())</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
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<p>现在 <code>* render()</code> 调用了一个返回 Promise 的 API，它就不再兼容同步了。不兼容同步的标签也仍然是合法标签，在异步 API 下也会正常运行。被同步调用时，返回 <code>Promise</code> 的标签会被渲染成 <code>[object Promise]</code>。</p>
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<h2 id="把-LiquidJS-生成器转换成-Promise" class="article-heading"><a href="#把-LiquidJS-生成器转换成-Promise" class="headerlink" title="把 LiquidJS 生成器转换成 Promise"></a>把 LiquidJS 生成器转换成 Promise<a class="article-anchor" href="#把-LiquidJS-生成器转换成-Promise" aria-hidden="true"></a></h2><p>有些 LiquidJS API 会返回 <code>Promise</code>，有些会返回生成器。你可以用 <a href="/api/functions/toPromise.html">toPromise</a> 来把生成器转换为 <code>Promise</code>，比如：</p>
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<figure class="highlight typescript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span> { <span class="title class_">TagToken</span>, <span class="title class_">Context</span>, <span class="title class_">Emitter</span>, <span class="title class_">TopLevelToken</span>, <span class="title class_">Value</span>, <span class="title class_">Tag</span>, <span class="title class_">Liquid</span>, toPromise } <span class="keyword">from</span> <span class="string">'liquidjs'</span></span><br><span class="line"></span><br><span class="line"><span class="comment">// Usage: {% upper "alice" %}</span></span><br><span class="line"><span class="comment">// Output: ALICE</span></span><br><span class="line">engine.<span class="title function_">registerTag</span>(<span class="string">'upper'</span>, <span class="keyword">class</span> <span class="title class_">UpperTag</span> <span class="keyword">extends</span> <span class="title class_ inherited__">Tag</span> {</span><br><span class="line"> <span class="keyword">private</span> <span class="attr">value</span>: <span class="title class_">Value</span></span><br><span class="line"> <span class="title function_">constructor</span> (<span class="params"><span class="attr">token</span>: <span class="title class_">TagToken</span>, <span class="attr">remainTokens</span>: <span class="title class_">TopLevelToken</span>[], <span class="attr">liquid</span>: <span class="title class_">Liquid</span></span>) {</span><br><span class="line"> <span class="variable language_">super</span>(token, remainTokens, liquid)</span><br><span class="line"> <span class="variable language_">this</span>.<span class="property">value</span> = <span class="keyword">new</span> <span class="title class_">Value</span>(token.<span class="property">args</span>, liquid)</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">async</span> <span class="title function_">render</span> (<span class="attr">ctx</span>: <span class="title class_">Context</span>, <span class="attr">emitter</span>: <span class="title class_">Emitter</span>) {</span><br><span class="line"> <span class="keyword">const</span> title = <span class="keyword">await</span> <span class="title function_">toPromise</span>(<span class="variable language_">this</span>.<span class="property">value</span>.<span class="title function_">value</span>(ctx))</span><br><span class="line"> emitter.<span class="title function_">write</span>(title.<span class="title function_">toUpperCase</span>())</span><br><span class="line"> }</span><br><span class="line">})</span><br></pre></td></tr></table></figure>
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<h2 id="纯异步标签" class="article-heading"><a href="#纯异步标签" class="headerlink" title="纯异步标签"></a>纯异步标签<a class="article-anchor" href="#纯异步标签" aria-hidden="true"></a></h2><p>如果你的标签就不打算支持同步，可以干脆实现成 <code>async render()</code>，这样就可以使用更熟悉的 <code>await</code> 了：</p>
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<figure class="highlight typescript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span> { toPromise, <span class="title class_">TagToken</span>, <span class="title class_">Context</span>, <span class="title class_">Emitter</span>, <span class="title class_">TopLevelToken</span>, <span class="title class_">Value</span>, <span class="title class_">Tag</span>, <span class="title class_">Liquid</span> } <span class="keyword">from</span> <span class="string">'liquidjs'</span></span><br><span class="line"></span><br><span class="line"><span class="comment">// Usage: {% upper "alice" %}</span></span><br><span class="line"><span class="comment">// Output: ALICE</span></span><br><span class="line">engine.<span class="title function_">registerTag</span>(<span class="string">'upper'</span>, <span class="keyword">class</span> <span class="title class_">UpperTag</span> <span class="keyword">extends</span> <span class="title class_ inherited__">Tag</span> {</span><br><span class="line"> <span class="keyword">private</span> <span class="attr">value</span>: <span class="title class_">Value</span></span><br><span class="line"> <span class="title function_">constructor</span> (<span class="params"><span class="attr">token</span>: <span class="title class_">TagToken</span>, <span class="attr">remainTokens</span>: <span class="title class_">TopLevelToken</span>[], <span class="attr">liquid</span>: <span class="title class_">Liquid</span></span>) {</span><br><span class="line"> <span class="variable language_">super</span>(token, remainTokens, liquid)</span><br><span class="line"> <span class="variable language_">this</span>.<span class="property">value</span> = <span class="keyword">new</span> <span class="title class_">Value</span>(token.<span class="property">args</span>, liquid)</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">async</span> <span class="title function_">render</span> (<span class="attr">ctx</span>: <span class="title class_">Context</span>, <span class="attr">emitter</span>: <span class="title class_">Emitter</span>) {</span><br><span class="line"> <span class="keyword">const</span> title = <span class="keyword">await</span> <span class="title function_">toPromise</span>(<span class="variable language_">this</span>.<span class="property">value</span>.<span class="title function_">value</span>(ctx))</span><br><span class="line"> emitter.<span class="title function_">write</span>(<span class="string">`<h1><span class="subst">${title}</span></h1>`</span>)</span><br><span class="line"> }</span><br><span class="line">})</span><br></pre></td></tr></table></figure>
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<time class="article-footer-updated" datetime="2024-08-19T19:36:26.430Z" itemprop="dateModified">上次更新：2024-08-19</time>
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