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@@ -110,56 +110,78 @@
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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="Implement-Sync-Compatible-Tags" class="article-heading"><a href="#Implement-Sync-Compatible-Tags" class="headerlink" title="Implement Sync-Compatible Tags"></a>Implement Sync-Compatible Tags<a class="article-anchor" href="#Implement-Sync-Compatible-Tags" aria-hidden="true"></a></h2><h3 id="Requirements" class="article-heading"><a href="#Requirements" class="headerlink" title="Requirements"></a>Requirements<a class="article-anchor" href="#Requirements" aria-hidden="true"></a></h3><p>All builtin tags are <em>sync-compatible</em> and safe to use for both sync and async APIs. To make your custom tag <em>sync-compatible</em>, you’ll need to avoid return a <code>Promise</code>. That means the <code>render(context, emitter)</code>:</p>
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<h2 id="Implement-Sync-Compatible-Tags" class="article-heading"><a href="#Implement-Sync-Compatible-Tags" class="headerlink" title="Implement Sync-Compatible Tags"></a>Implement Sync-Compatible Tags<a class="article-anchor" href="#Implement-Sync-Compatible-Tags" aria-hidden="true"></a></h2><p>LiquidJS uses a generator-based async implementation to support both async and sync in one piece of tag implementation. For example, below <code>UpperTag</code> can be used in both <code>engine.renderSync()</code> and <code>engine.render()</code>.</p>
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<pre class="line-numbers language-typescript" data-language="typescript"><code class="language-typescript"><span class="token keyword">import</span> <span class="token punctuation">{</span> TagToken<span class="token punctuation">,</span> Context<span class="token punctuation">,</span> Emitter<span class="token punctuation">,</span> TopLevelToken<span class="token punctuation">,</span> Value<span class="token punctuation">,</span> Tag<span class="token punctuation">,</span> Liquid <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">'liquidjs'</span>
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<span class="token comment">// Usage: {% upper "alice" %}</span>
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<span class="token comment">// Output: ALICE</span>
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engine<span class="token punctuation">.</span><span class="token function">registerTag</span><span class="token punctuation">(</span><span class="token string">'upper'</span><span class="token punctuation">,</span> <span class="token keyword">class</span> <span class="token class-name">UpperTag</span> <span class="token keyword">extends</span> <span class="token class-name">Tag</span> <span class="token punctuation">{</span>
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<span class="token keyword">private</span> value<span class="token operator">:</span> Value
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<span class="token function">constructor</span> <span class="token punctuation">(</span>token<span class="token operator">:</span> TagToken<span class="token punctuation">,</span> remainTokens<span class="token operator">:</span> TopLevelToken<span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">,</span> liquid<span class="token operator">:</span> Liquid<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">super</span><span class="token punctuation">(</span>token<span class="token punctuation">,</span> remainTokens<span class="token punctuation">,</span> liquid<span class="token punctuation">)</span>
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<span class="token keyword">this</span><span class="token punctuation">.</span>value <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Value</span><span class="token punctuation">(</span>token<span class="token punctuation">.</span>args<span class="token punctuation">,</span> liquid<span class="token punctuation">)</span>
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<span class="token punctuation">}</span>
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<span class="token operator">*</span> <span class="token function">render</span> <span class="token punctuation">(</span>ctx<span class="token operator">:</span> Context<span class="token punctuation">,</span> emitter<span class="token operator">:</span> Emitter<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">const</span> title <span class="token operator">=</span> <span class="token keyword">yield</span> <span class="token keyword">this</span><span class="token punctuation">.</span>value<span class="token punctuation">.</span><span class="token function">value</span><span class="token punctuation">(</span>ctx<span class="token punctuation">)</span>
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emitter<span class="token punctuation">.</span><span class="token function">write</span><span class="token punctuation">(</span>title<span class="token punctuation">.</span><span class="token function">toUpperCase</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span><span class="token punctuation">)</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
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<p>All builtin tags are implemented this way and safe to use in both sync and async (I’ll call it <em>sync-compatible</em>). To make your custom tag <em>sync-compatible</em>, you’ll need to:</p>
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<ul>
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<li>Should not directly <code>return <Promise></code>, and</li>
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<li>Should not be declared as <code>async</code>.</li>
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<li>declare render function as <code>* render()</code>, in which</li>
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<li>do not directly <code>return <Promise></code>, and</li>
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<li>do not call any APIs that returns a Promise.</li>
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</ul>
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<h2 id="Call-APIs-that-return-a-Promise" class="article-heading"><a href="#Call-APIs-that-return-a-Promise" class="headerlink" title="Call APIs that return a Promise"></a>Call APIs that return a Promise<a class="article-anchor" href="#Call-APIs-that-return-a-Promise" aria-hidden="true"></a></h2><p>But LiquidJS is Promise-friendly, right? You can still call Promise-based functions and wait for that Promise within tag implementations. Just replace <code>await</code> with <code>yield</code>. e.g. we’re calling <code>fs.readFile()</code> which returns a <code>Promise</code>:</p>
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<pre class="line-numbers language-typescript" data-language="typescript"><code class="language-typescript"><span class="token operator">*</span> <span class="token function">render</span> <span class="token punctuation">(</span>ctx<span class="token operator">:</span> Context<span class="token punctuation">,</span> emitter<span class="token operator">:</span> Emitter<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">const</span> file <span class="token operator">=</span> <span class="token keyword">yield</span> <span class="token keyword">this</span><span class="token punctuation">.</span>value<span class="token punctuation">.</span><span class="token function">value</span><span class="token punctuation">(</span>ctx<span class="token punctuation">)</span>
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<span class="token keyword">const</span> title <span class="token operator">=</span> <span class="token keyword">yield</span> fs<span class="token punctuation">.</span><span class="token function">readFile</span><span class="token punctuation">(</span>file<span class="token punctuation">,</span> <span class="token string">'utf8'</span><span class="token punctuation">)</span>
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emitter<span class="token punctuation">.</span><span class="token function">write</span><span class="token punctuation">(</span>title<span class="token punctuation">.</span><span class="token function">toUpperCase</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
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<span class="token punctuation">}</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span></span></code></pre>
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<p>Now that this <code>* render()</code> calls an API that returns a Promise, so it’s no longer <em>sync-compatible</em>.</p>
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<blockquote class="note info"><strong class="note-title">Non Sync-Compatible Tags</strong><p>Non <em>sync-compatible</em> tags are also valid tags, will work just fine for asynchronous API calls. When called synchronously, tags that return a <code>Promise</code> will be rendered as <code>[object Promise]</code>.</p>
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</blockquote>
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<h3 id="Await-Promises" class="article-heading"><a href="#Await-Promises" class="headerlink" title="Await Promises"></a>Await Promises<a class="article-anchor" href="#Await-Promises" aria-hidden="true"></a></h3><p>But LiquidJS is Promise-friendly, right? You can still call Promise-based functions and wait for that Promise within tag implementations. Just replace <code>await</code> with <code>yield</code> and keep <code>* render()</code> instead of <code>async render()</code>. e.g.</p>
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<pre class="line-numbers language-typescript" data-language="typescript"><code class="language-typescript"><span class="token keyword">import</span> <span class="token punctuation">{</span> TagToken<span class="token punctuation">,</span> Context<span class="token punctuation">,</span> Emitter<span class="token punctuation">,</span> TopLevelToken <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">'liquidjs'</span>
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<h2 id="Convert-LiquidJS-async-Generator-to-Promise" class="article-heading"><a href="#Convert-LiquidJS-async-Generator-to-Promise" class="headerlink" title="Convert LiquidJS async Generator to Promise"></a>Convert LiquidJS async Generator to Promise<a class="article-anchor" href="#Convert-LiquidJS-async-Generator-to-Promise" aria-hidden="true"></a></h2><p>You can convert a Generator to Promise by <a href="/api/modules/liquid_.html#toPromise">toPromise</a>, for example:</p>
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<pre class="line-numbers language-typescript" data-language="typescript"><code class="language-typescript"><span class="token keyword">import</span> <span class="token punctuation">{</span> TagToken<span class="token punctuation">,</span> Context<span class="token punctuation">,</span> Emitter<span class="token punctuation">,</span> TopLevelToken<span class="token punctuation">,</span> Value<span class="token punctuation">,</span> Tag<span class="token punctuation">,</span> Liquid<span class="token punctuation">,</span> toPromise <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">'liquidjs'</span>
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<span class="token comment">// Usage: {% upper "alice" %}</span>
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<span class="token comment">// Output: ALICE</span>
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engine<span class="token punctuation">.</span><span class="token function">registerTag</span><span class="token punctuation">(</span><span class="token string">'upper'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
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<span class="token function-variable function">parse</span><span class="token operator">:</span> <span class="token keyword">function</span><span class="token punctuation">(</span>tagToken<span class="token operator">:</span> TagToken<span class="token punctuation">,</span> remainTokens<span class="token operator">:</span> TopLevelToken<span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">this</span><span class="token punctuation">.</span>str <span class="token operator">=</span> tagToken<span class="token punctuation">.</span>args
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<span class="token punctuation">}</span><span class="token punctuation">,</span>
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<span class="token operator">*</span> <span class="token function-variable function">render</span><span class="token operator">:</span> <span class="token keyword">function</span><span class="token punctuation">(</span>ctx<span class="token operator">:</span> Context<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token comment">// _evalValue will behave synchronously when called by synchronous API</span>
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<span class="token comment">// in which case `ctx.sync == true`</span>
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<span class="token keyword">var</span> str <span class="token operator">=</span> <span class="token keyword">yield</span> <span class="token keyword">this</span><span class="token punctuation">.</span>liquid<span class="token punctuation">.</span><span class="token function">_evalValue</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>str<span class="token punctuation">,</span> ctx<span class="token punctuation">)</span>
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<span class="token keyword">return</span> str<span class="token punctuation">.</span><span class="token function">toUpperCase</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
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<span class="token punctuation">}</span>
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engine<span class="token punctuation">.</span><span class="token function">registerTag</span><span class="token punctuation">(</span><span class="token string">'upper'</span><span class="token punctuation">,</span> <span class="token keyword">class</span> <span class="token class-name">UpperTag</span> <span class="token keyword">extends</span> <span class="token class-name">Tag</span> <span class="token punctuation">{</span>
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<span class="token keyword">private</span> value<span class="token operator">:</span> Value
|
||||
<span class="token function">constructor</span> <span class="token punctuation">(</span>token<span class="token operator">:</span> TagToken<span class="token punctuation">,</span> remainTokens<span class="token operator">:</span> TopLevelToken<span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">,</span> liquid<span class="token operator">:</span> Liquid<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">super</span><span class="token punctuation">(</span>token<span class="token punctuation">,</span> remainTokens<span class="token punctuation">,</span> liquid<span class="token punctuation">)</span>
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<span class="token keyword">this</span><span class="token punctuation">.</span>value <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Value</span><span class="token punctuation">(</span>token<span class="token punctuation">.</span>args<span class="token punctuation">,</span> liquid<span class="token punctuation">)</span>
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<span class="token punctuation">}</span>
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<span class="token keyword">async</span> <span class="token function">render</span> <span class="token punctuation">(</span>ctx<span class="token operator">:</span> Context<span class="token punctuation">,</span> emitter<span class="token operator">:</span> Emitter<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">const</span> title <span class="token operator">=</span> <span class="token keyword">await</span> <span class="token function">toPromise</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>value<span class="token punctuation">.</span><span class="token function">value</span><span class="token punctuation">(</span>ctx<span class="token punctuation">)</span><span class="token punctuation">)</span>
|
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emitter<span class="token punctuation">.</span><span class="token function">write</span><span class="token punctuation">(</span>title<span class="token punctuation">.</span><span class="token function">toUpperCase</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
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<span class="token punctuation">}</span>
|
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<span class="token punctuation">}</span><span class="token punctuation">)</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
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<p>See this JSFiddle: <a target="_blank" rel="noopener external nofollow noreferrer" href="http://jsfiddle.net/ctj364up/6/">http://jsfiddle.net/ctj364up/6/</a>.</p>
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<h2 id="Async-only-Tags" class="article-heading"><a href="#Async-only-Tags" class="headerlink" title="Async-only Tags"></a>Async-only Tags<a class="article-anchor" href="#Async-only-Tags" aria-hidden="true"></a></h2><p>For tags that intended to be used only by async API, or those cannot be implemented synchronously, there’s no difference between using generator-base syntax or async syntax. I’ll call them <em>async-only tags</em>.</p>
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<p>For example, if the above <code>this.liquid._evalValue()</code> doesn’t respect <code>ctx.sync</code> and always returns a Promise, even if the tag is implemented using <code>* render()</code> and <code>yield this.liquid._evalValue()</code>, it will be rendered as <code><object Promise></code> anyway.</p>
|
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<p>For <em>async-only tags</em>, you can use async syntax at will. Be careful some APIs in LiquidJS return Promises and others return Generators. You’ll need <a href="/api/modules/liquid_.html#toPromise">toPromise</a> API to convert a Generator to a Promise, for example:</p>
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<pre class="line-numbers language-typescript" data-language="typescript"><code class="language-typescript"><span class="token keyword">import</span> <span class="token punctuation">{</span> TagToken<span class="token punctuation">,</span> Context<span class="token punctuation">,</span> Emitter<span class="token punctuation">,</span> TopLevelToken<span class="token punctuation">,</span> toPromise <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">'liquidjs'</span>
|
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<h2 id="Async-only-Tags" class="article-heading"><a href="#Async-only-Tags" class="headerlink" title="Async only Tags"></a>Async only Tags<a class="article-anchor" href="#Async-only-Tags" aria-hidden="true"></a></h2><p>If your tag is intend to be used only asynchronously, it can be declared as <code>async render()</code> so you can use <code>await</code> in its implementation directly:</p>
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<pre class="line-numbers language-typescript" data-language="typescript"><code class="language-typescript"><span class="token keyword">import</span> <span class="token punctuation">{</span> toPromise<span class="token punctuation">,</span> TagToken<span class="token punctuation">,</span> Context<span class="token punctuation">,</span> Emitter<span class="token punctuation">,</span> TopLevelToken<span class="token punctuation">,</span> Value<span class="token punctuation">,</span> Tag<span class="token punctuation">,</span> Liquid <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">'liquidjs'</span>
|
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|
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<span class="token comment">// Usage: {% upper "alice" %}</span>
|
||||
<span class="token comment">// Output: ALICE</span>
|
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engine<span class="token punctuation">.</span><span class="token function">registerTag</span><span class="token punctuation">(</span><span class="token string">'upper'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
|
||||
<span class="token function-variable function">parse</span><span class="token operator">:</span> <span class="token keyword">function</span><span class="token punctuation">(</span>tagToken<span class="token operator">:</span> TagToken<span class="token punctuation">,</span> remainTokens<span class="token operator">:</span> TopLevelToken<span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
|
||||
<span class="token keyword">this</span><span class="token punctuation">.</span>str <span class="token operator">=</span> tagToken<span class="token punctuation">.</span>args<span class="token punctuation">;</span> <span class="token comment">// name</span>
|
||||
<span class="token punctuation">}</span><span class="token punctuation">,</span>
|
||||
<span class="token function-variable function">render</span><span class="token operator">:</span> <span class="token keyword">async</span> <span class="token keyword">function</span><span class="token punctuation">(</span>ctx<span class="token operator">:</span> Context<span class="token punctuation">)</span> <span class="token punctuation">{</span>
|
||||
<span class="token keyword">var</span> str <span class="token operator">=</span> <span class="token keyword">await</span> <span class="token function">toPromise</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>liquid<span class="token punctuation">.</span><span class="token function">_evalValue</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>str<span class="token punctuation">,</span> ctx<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
||||
<span class="token comment">// Or use the alternate API that returns a Promise</span>
|
||||
<span class="token comment">// var str = await this.liquid.evalValue(this.str, ctx);</span>
|
||||
<span class="token keyword">return</span> str<span class="token punctuation">.</span><span class="token function">toUpperCase</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
|
||||
<span class="token punctuation">}</span>
|
||||
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
|
||||
engine<span class="token punctuation">.</span><span class="token function">registerTag</span><span class="token punctuation">(</span><span class="token string">'upper'</span><span class="token punctuation">,</span> <span class="token keyword">class</span> <span class="token class-name">UpperTag</span> <span class="token keyword">extends</span> <span class="token class-name">Tag</span> <span class="token punctuation">{</span>
|
||||
<span class="token keyword">private</span> value<span class="token operator">:</span> Value
|
||||
<span class="token function">constructor</span> <span class="token punctuation">(</span>token<span class="token operator">:</span> TagToken<span class="token punctuation">,</span> remainTokens<span class="token operator">:</span> TopLevelToken<span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">,</span> liquid<span class="token operator">:</span> Liquid<span class="token punctuation">)</span> <span class="token punctuation">{</span>
|
||||
<span class="token keyword">super</span><span class="token punctuation">(</span>token<span class="token punctuation">,</span> remainTokens<span class="token punctuation">,</span> liquid<span class="token punctuation">)</span>
|
||||
<span class="token keyword">this</span><span class="token punctuation">.</span>value <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Value</span><span class="token punctuation">(</span>token<span class="token punctuation">.</span>args<span class="token punctuation">,</span> liquid<span class="token punctuation">)</span>
|
||||
<span class="token punctuation">}</span>
|
||||
<span class="token keyword">async</span> <span class="token function">render</span> <span class="token punctuation">(</span>ctx<span class="token operator">:</span> Context<span class="token punctuation">,</span> emitter<span class="token operator">:</span> Emitter<span class="token punctuation">)</span> <span class="token punctuation">{</span>
|
||||
<span class="token keyword">const</span> title <span class="token operator">=</span> <span class="token keyword">await</span> <span class="token function">toPromise</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>value<span class="token punctuation">.</span><span class="token function">value</span><span class="token punctuation">(</span>ctx<span class="token punctuation">)</span><span class="token punctuation">)</span>
|
||||
emitter<span class="token punctuation">.</span><span class="token function">write</span><span class="token punctuation">(</span><span class="token template-string"><span class="token template-punctuation string">`</span><span class="token string"><h1></span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">${</span>title<span class="token interpolation-punctuation punctuation">}</span></span><span class="token string"></h1></span><span class="token template-punctuation string">`</span></span><span class="token punctuation">)</span>
|
||||
<span class="token punctuation">}</span>
|
||||
<span class="token punctuation">}</span><span class="token punctuation">)</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
|
||||
|
||||
<p>See this JSFiddle: <a target="_blank" rel="noopener external nofollow noreferrer" href="http://jsfiddle.net/ctj364up/5/">http://jsfiddle.net/ctj364up/5/</a>.</p>
|
||||
|
||||
</div>
|
||||
<footer class="article-footer">
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<time class="article-footer-updated" datetime="2022-12-12T11:42:17.368Z" itemprop="dateModified">Last updated: 2022-12-12</time>
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<time class="article-footer-updated" datetime="2022-12-13T18:14:39.909Z" itemprop="dateModified">Last updated: 2022-12-13</time>
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@@ -168,7 +190,7 @@ engine<span class="token punctuation">.</span><span class="token function">regis
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<div id="article-toc-inner-list">
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<strong class="sidebar-title">Contents</strong>
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<ol class="toc"><li class="toc-item toc-level-2"><a class="toc-link" href="#Sync-and-Async-API"><span class="toc-text">Sync and Async API</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#Implement-Sync-Compatible-Tags"><span class="toc-text">Implement Sync-Compatible Tags</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#Requirements"><span class="toc-text">Requirements</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#Await-Promises"><span class="toc-text">Await Promises</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#Async-only-Tags"><span class="toc-text">Async-only Tags</span></a></li></ol>
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<ol class="toc"><li class="toc-item toc-level-2"><a class="toc-link" href="#Sync-and-Async-API"><span class="toc-text">Sync and Async API</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#Implement-Sync-Compatible-Tags"><span class="toc-text">Implement Sync-Compatible Tags</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#Call-APIs-that-return-a-Promise"><span class="toc-text">Call APIs that return a Promise</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#Convert-LiquidJS-async-Generator-to-Promise"><span class="toc-text">Convert LiquidJS async Generator to Promise</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#Async-only-Tags"><span class="toc-text">Async only Tags</span></a></li></ol>
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</div>
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<a href="#" id="article-toc-top">Back to Top</a>
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Reference in New Issue
Block a user