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<h1 class="article-title" itemprop="name">参数解析</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/parse-parameters.md" class="article-edit-link" title="改进这篇文档"><i class="icon-pencil"></i></a>
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<h2 id="访问原始参数" class="article-heading"><a href="#访问原始参数" class="headerlink" title="访问原始参数"></a>访问原始参数<a class="article-anchor" href="#访问原始参数" aria-hidden="true"></a></h2><p>在 <a href="/tutorials/register-filters-tags.html">注册过滤器和标签</a> 中提到，可以通过 <code>tagToken.args</code> 来得到标签的原始参数字符串。例如：</p>
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<pre class="line-numbers language-javascript" data-language="javascript"><code class="language-javascript"><span class="token comment">// Usage: {% random foo bar coo %}</span>
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<span class="token comment">// Output: "foo", "bar" or "coo"</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">'random'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
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<span class="token function">parse</span><span class="token punctuation">(</span><span class="token parameter">tagToken</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token comment">// tagToken.args === "foo bar coo"</span>
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<span class="token keyword">this</span><span class="token punctuation">.</span>items <span class="token operator">=</span> tagToken<span class="token punctuation">.</span>args<span class="token punctuation">.</span><span class="token function">split</span><span class="token punctuation">(</span><span class="token string">' '</span><span class="token punctuation">)</span>
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<span class="token punctuation">}</span><span class="token punctuation">,</span>
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<span class="token function">render</span><span class="token punctuation">(</span><span class="token parameter">context<span class="token punctuation">,</span> emitter</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token comment">// get a random index</span>
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<span class="token keyword">const</span> index <span class="token operator">=</span> Math<span class="token punctuation">.</span><span class="token function">floor</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>items<span class="token punctuation">.</span>length <span class="token operator">*</span> Math<span class="token punctuation">.</span><span class="token function">random</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
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<span class="token comment">// output that item</span>
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emitter<span class="token punctuation">.</span><span class="token function">write</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>items<span class="token punctuation">[</span>index<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></code></pre>
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<p>见这个 JSFiddle：<a target="_blank" rel="noopener external nofollow noreferrer" href="http://jsfiddle.net/ctj364up/2/">http://jsfiddle.net/ctj364up/2/</a>。</p>
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<h2 id="解析参数的值" class="article-heading"><a href="#解析参数的值" class="headerlink" title="解析参数的值"></a>解析参数的值<a class="article-anchor" href="#解析参数的值" aria-hidden="true"></a></h2><p>除了静态的参数字符串之外，我们更希望把动态的值传递给标签。LiquidJS 中的值可以是字面量（字符串、数字等，也可以是当前上下文的变量。</p>
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<p>下面是修改过的模板，也包含三个值用来随机。但它们表示的是值而不是静态的字符串。第一个是字符串字面量，第二个是标识符（表示变量），第三个是属性访问表达式，包含两个标识符。</p>
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<pre class="line-numbers language-liquid" data-language="liquid"><code class="language-liquid"><span class="token liquid language-liquid"><span class="token delimiter punctuation">{%</span> random <span class="token string">"foo"</span> bar obj<span class="token punctuation">.</span>coo <span class="token delimiter punctuation">%}</span></span><span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre>
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<p>解析这么多种情况会很麻烦，但 LiquidJS 提供了 <a href="/api/classes/parser_tokenizer_.tokenizer.html">Tokenizer</a> 类来处理这种情况。</p>
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<pre class="line-numbers language-javascript" data-language="javascript"><code class="language-javascript"><span class="token keyword">const</span> <span class="token punctuation">{</span> Liquid<span class="token punctuation">,</span> Tokenizer<span class="token punctuation">,</span> evalToken <span class="token punctuation">}</span> <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">'liquidjs'</span><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">'random'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
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<span class="token function">parse</span><span class="token punctuation">(</span><span class="token parameter">tagToken</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">const</span> tokenizer <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Tokenizer</span><span class="token punctuation">(</span>tagToken<span class="token punctuation">.</span>args<span class="token punctuation">)</span>
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<span class="token keyword">this</span><span class="token punctuation">.</span>items <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token punctuation">]</span>
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<span class="token keyword">while</span> <span class="token punctuation">(</span><span class="token operator">!</span>tokenizer<span class="token punctuation">.</span><span class="token function">end</span><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 comment">// here readValue() returns a LiteralToken or PropertyAccessToken</span>
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<span class="token keyword">this</span><span class="token punctuation">.</span>items<span class="token punctuation">.</span><span class="token function">push</span><span class="token punctuation">(</span>tokenizer<span class="token punctuation">.</span><span class="token function">readValue</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>
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<span class="token operator">*</span> <span class="token function">render</span><span class="token punctuation">(</span><span class="token parameter">context<span class="token punctuation">,</span> emitter</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">const</span> index <span class="token operator">=</span> Math<span class="token punctuation">.</span><span class="token function">floor</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>items<span class="token punctuation">.</span>length <span class="token operator">*</span> Math<span class="token punctuation">.</span><span class="token function">random</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
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<span class="token keyword">const</span> token <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>items<span class="token punctuation">[</span>index<span class="token punctuation">]</span>
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<span class="token comment">// in LiquidJS, we use yield to wait for async call</span>
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<span class="token keyword">const</span> value <span class="token operator">=</span> <span class="token keyword">yield</span> <span class="token function">evalToken</span><span class="token punctuation">(</span>token<span class="token punctuation">,</span> context<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>value<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></span><span></span><span></span><span></span></span></code></pre>
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<p>用上下文 <code>{ bar: "bar", obj: { coo: "coo" } }</code> 来调用这个标签可以得到上第一个例子一样的效果。见这个 JSFiddle：<a target="_blank" rel="noopener external nofollow noreferrer" href="http://jsfiddle.net/ctj364up/3/">http://jsfiddle.net/ctj364up/3/</a>.</p>
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<blockquote class="note info"><strong class="note-title">异步和 Promise</strong><p>在 LiquidJS 里异步用生成器实现，这样同样一份标签的实现也可以用于同步的 API 比如 <code>renderSync()</code>，<code>parseAndRenderSync()</code>，<code>renderFileSync()</code>。如果要在标签实现里等待 Promise，只需要把 <code>await somePromise</code> 换成 <code>yield somePromise</code>，并保留 <code>* render()</code> 不要改成 <code>async render()</code>。更多细节请参考 <a href="/tutorials/sync-and-async.html">Sync and Async</a>。</p>
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</blockquote>
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<h2 id="把键值对解析为命名参数" class="article-heading"><a href="#把键值对解析为命名参数" class="headerlink" title="把键值对解析为命名参数"></a>把键值对解析为命名参数<a class="article-anchor" href="#把键值对解析为命名参数" aria-hidden="true"></a></h2><p>当参数很多时或者有可选参数时，使用命名参数语法会很方便。这时参数由无序的键值对构成，LiquidJS 中的 <a href="/api/classes/template_tag_hash_.hash.html">Hash</a> 类就是来处理这种情况的。</p>
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<pre class="line-numbers language-liquid" data-language="liquid"><code class="language-liquid"><span class="token liquid language-liquid"><span class="token delimiter punctuation">{%</span> random from<span class="token operator">:</span><span class="token number">2</span><span class="token punctuation">,</span> to<span class="token operator">:</span>max <span class="token delimiter punctuation">%}</span></span><span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre>
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<p>上面的例子用来产生 [2, max] 范围内的随机数。我们要用 <code>Hash</code> 来解析 <code>from</code> 和 <code>to</code> 参数。</p>
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<pre class="line-numbers language-javascript" data-language="javascript"><code class="language-javascript"><span class="token keyword">const</span> <span class="token punctuation">{</span> Liquid<span class="token punctuation">,</span> Hash <span class="token punctuation">}</span> <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">'liquidjs'</span><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">'random'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
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<span class="token function">parse</span><span class="token punctuation">(</span><span class="token parameter">tagToken</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token comment">// 解析参数结果，存到 `this.args` 里</span>
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<span class="token keyword">this</span><span class="token punctuation">.</span>args <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Hash</span><span class="token punctuation">(</span>tagToken<span class="token punctuation">.</span>args<span class="token punctuation">)</span>
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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">render</span><span class="token punctuation">(</span><span class="token parameter">context<span class="token punctuation">,</span> emitter</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token comment">// 在当前 `context` 下计算参数的值</span>
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<span class="token keyword">const</span> <span class="token punctuation">{</span>from<span class="token punctuation">,</span> to<span class="token punctuation">}</span> <span class="token operator">=</span> <span class="token keyword">yield</span> <span class="token keyword">this</span><span class="token punctuation">.</span>args<span class="token punctuation">.</span><span class="token function">render</span><span class="token punctuation">(</span>context<span class="token punctuation">)</span>
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<span class="token keyword">const</span> length <span class="token operator">=</span> to <span class="token operator">-</span> from <span class="token operator">+</span> <span class="token number">1</span>
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<span class="token keyword">const</span> value <span class="token operator">=</span> from <span class="token operator">+</span> Math<span class="token punctuation">.</span><span class="token function">floor</span><span class="token punctuation">(</span>length <span class="token operator">*</span> Math<span class="token punctuation">.</span><span class="token function">random</span><span class="token punctuation">(</span><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>value<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>在 <code>{ max: 10 }</code> 上下文上渲染 <code>{% random from:2, to:max %}</code> 将会得到 [2, 10] 范围内的随机数。见这个 JSFiddle：<a target="_blank" rel="noopener external nofollow noreferrer" href="http://jsfiddle.net/ctj364up/4/">http://jsfiddle.net/ctj364up/4/</a>。</p>
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<time class="article-footer-updated" datetime="2022-02-20T07:57:34.593Z" itemprop="dateModified">上次更新：2022-02-20</time>
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