converter-lib.html

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        <div id="content"><h1 class="w3-xxlarge">HTML and MD to VanJS Code Converter</h1><p>This is a library that can convert any MD or HTML snippet into valid <strong>VanJS</strong> code. The UI version of the code converter is <a href="https://vanjs.org/convert" class="w3-hover-opacity">here</a>.</p><h2 class="w3-xxlarge w3-text-red" id="installation"><a class="self-link" href="#installation">Installation</a></h2><hr style="width:50px;border:5px solid red" class="w3-round"><p>The library is published as NPM package <a href="https://www.npmjs.com/package/vanjs-converter" class="w3-hover-opacity">vanjs-converter</a>.</p><p>Run the following command to install the package:</p><pre><code class="language-shell">npm install vanjs-converter
</code></pre><p>To use the NPM package, add this line to your script:</p><pre><code class="language-js">import { htmlToVanCode, mdToVanCode } from "vanjs-converter"
</code></pre><h2 class="w3-xxlarge w3-text-red" id="htmltovancode-convert-html-snippet-to-vanjs-code"><a class="self-link" href="#htmltovancode-convert-html-snippet-to-vanjs-code"><code class="symbol">htmlToVanCode</code>: Convert HTML snippet to VanJS Code</a></h2><hr style="width:50px;border:5px solid red" class="w3-round"><h3 class="w3-large w3-text-red" id="signature"><a class="self-link" href="#signature">Signature</a></h3><pre><code class="language-js">htmlToVanCode(&lt;HTML string&gt;, &lt;options&gt;) =&gt; {code: &lt;code&gt;, tags: &lt;tags&gt;, components: &lt;components&gt;}
</code></pre><h3 class="w3-large w3-text-red" id="example"><a class="self-link" href="#example">Example</a></h3><pre><code class="language-js">htmlToVanCode('&lt;div&gt;&lt;p&gt;👋Hello&lt;/p&gt;&lt;ul&gt;&lt;li&gt;🗺️World&lt;/li&gt;&lt;li&gt;&lt;a href="https://vanjs.org/"&gt;🍦VanJS&lt;/a&gt;&lt;/li&gt;&lt;/ul&gt;&lt;/div&gt;', {indent: 4})
/*
The following result will be returned:
{
  code: [
    'div(',
    '    p(',
    '        "👋Hello",',
    '    ),',
    '    ul(',
    '        li(',
    '            "🗺️World",',
    '        ),',
    '        li(',
    '            a({href: "https://vanjs.org/"},',
    '                "🍦VanJS",',
    '            ),',
    '        ),',
    '    ),',
    ')',
  ],
  tags: ["a", "div", "li", "p", "ul"],
  components: [],
}
*/
</code></pre><h3 class="w3-large w3-text-red" id="using-vanjs-components"><a class="self-link" href="#using-vanjs-components">Using VanJS Components</a></h3><p><em>This is only supported in the converter library, not in the UI. The <a href="https://github.com/remarkablemark/html-react-parser/issues/168#issuecomment-699536994" class="w3-hover-opacity">root cause</a> is <a href="https://www.npmjs.com/package/html-dom-parser" class="w3-hover-opacity">html-dom-parser</a> doesn't support case-sensitive parsing on the client side.</em></p><p>The input HTML string can be a mix of HTML elements and custom UI components built with <strong>VanJS</strong>. To use custom UI components, just specify the component similar to regular HTML tags. For instance, assume we have custom UI components similar to the ones shown in <a href="https://vanjs.org/" class="w3-hover-opacity">https://vanjs.org/</a> home page:</p><pre><code class="language-js">const Hello = text =&gt; div(
  p("👋Hello"),
  ul(
    li(text),
    li(a({href: "https://vanjs.org/"}, "🍦VanJS")),
  ),
)

const Counter = ({initValue}) =&gt; {
  const counter = van.state(initValue)
  return button({onclick: () =&gt; ++counter.val}, counter)
}
</code></pre><p>You can simply specify the input HTML string like this:</p><pre><code class="language-html">&lt;h2&gt;Hello&lt;/h2&gt;
&lt;Hello&gt;🗺️World&lt;/Hello&gt;
&lt;h2&gt;Counter&lt;/h2&gt;
&lt;Counter initValue="1"&gt;&lt;/Counter&gt;
&lt;Counter initValue="2"&gt;&lt;/Counter&gt;
</code></pre><p>which will be converted into the following <strong>VanJS</strong> code:</p><pre><code class="language-js">h2(
  "Hello",
),
Hello(
  "🗺️World",
),
h2(
  "Counter",
),
Counter({initValue: "1"}),
Counter({initValue: "2"}),
</code></pre><h3 class="w3-large w3-text-red" id="options"><a class="self-link" href="#options">Options</a></h3><ul><li><p><code class="symbol">indent</code>: Type <code class="symbol">number</code>. Default <code class="symbol">2</code>. Optional. The indent level of the generated <strong>VanJS code</strong>.</p></li><li><p><code class="symbol">spacing</code>: Type <code class="symbol">boolean</code>. Default <code class="symbol">false</code>. Optional. The style of the property object in the generated <strong>VanJS</strong> code. If <code class="symbol">true</code>, the property object will look like <code class="symbol">{href: "https://vanjs.org/"}</code>; Otherwise, the property object will look like <code class="symbol">{ href: "https://vanjs.org/" }</code>.</p></li><li><p><code class="symbol">skipEmptyText</code>: Type <code class="symbol">boolean</code>. Default <code class="symbol">false</code>. Optional. Whether to skip empty text nodes in the generated <strong>VanJS code</strong>. For instance, the HTML snippet:</p><pre><code class="language-html">&lt;div&gt;
  &lt;p&gt;👋Hello&lt;/p&gt;
  &lt;ul&gt;
    &lt;li&gt;🗺️World&lt;/li&gt;
    &lt;li&gt;&lt;a href="https://vanjs.org/"&gt;🍦VanJS&lt;/a&gt;&lt;/li&gt;
  &lt;/ul&gt;
&lt;/div&gt;
</code></pre><p>will be converted to:</p><pre><code class="language-js">div(
  p(
    "👋Hello",
  ),
  ul(
    li(
      "🗺️World",
    ),
    li(
      a({href: "https://vanjs.org/"},
        "🍦VanJS",
      ),
    ),
  ),
)
</code></pre><p>if <code class="symbol">skipEmptyText</code> is <code class="symbol">true</code>. But it will be converted to:</p><pre><code class="language-js">div(
  "\n  ",
  p(
    "👋Hello",
  ),
  "\n  ",
  ul(
    "\n    ",
    li(
      "🗺️World",
    ),
    "\n    ",
    li(
      a({href: "https://vanjs.org/"},
        "🍦VanJS",
      ),
    ),
    "\n  ",
  ),
  "\n",
)
</code></pre><p>if <code class="symbol">skipEmptyText</code> is <code class="symbol">false</code>.</p></li><li><p><code class="symbol">htmlTagPred</code>: Type <code class="symbol">(name: string) =&gt; boolean</code>. Default <code class="symbol">s =&gt; s.toLowerCase() === s</code>. Optional. A predicate function to check whether a specific tag snippet such as <code class="symbol">&lt;Counter&gt;</code> should be treated as a native HTML element or a custom UI component built with <strong>VanJS</strong>. By default, it will be treated as a native HTML element if the letters in the <code class="symbol">name</code> are all lowercase.</p></li></ul><h3 class="w3-large w3-text-red" id="return-value"><a class="self-link" href="#return-value">Return Value</a></h3><p>A plain object with the following fields:</p><ul><li><code class="symbol">code</code>: A <code class="symbol">string[]</code> for all lines of the generated <strong>VanJS</strong> code.</li><li><code class="symbol">tags</code>: A <code class="symbol">string[]</code> for all HTML tag names used in the generated <strong>VanJS</strong> code, which can be used in the importing line of tag functions such as:<pre><code class="language-js">const {&lt;tags needs to import&gt;} = van.tags
</code></pre></li><li><code class="symbol">components</code>: A <code class="symbol">string[]</code> for all custom <strong>VanJS</strong> components used in the generated <strong>VanJS</strong> code, which can be used in the importing line such as:<pre><code class="language-js">import {&lt;components needs to import&gt;} from "./my-component-lib.js"
</code></pre></li></ul><h3 class="w3-large w3-text-red" id="dummy"><a class="self-link" href="#dummy"><code class="symbol">DUMMY</code></a></h3><p><em>This is only supported in the converter library, not in the UI.</em></p><p>There are 2 special cases while specifying custom <strong>VanJS</strong> components in the input HTML string. The first special case is that, sometimes, a custom component needs properties being specified in its first argument, even for empty properties <code class="symbol">{}</code> (e.g.: the <code class="symbol">Counter</code> component defined in the <a href="#using-vanjs-components" class="w3-hover-opacity">section</a> above). In this case, you can specify the special <code class="symbol">DUMMY</code> property as a placeholder. For instance:</p><pre><code class="language-html">&lt;CustomElement DUMMY&gt;content&lt;/CustomElement&gt;
</code></pre><p>will be converted to:</p><pre><code class="language-js">CustomElement({},
  "content",
)
</code></pre><p>whereas</p><pre><code class="language-html">&lt;CustomElement&gt;content&lt;/CustomElement&gt;
</code></pre><p>will be converted to:</p><pre><code class="language-js">CustomElement(
  "content",
)
</code></pre><p>The second special case is that, sometimes, a custom <strong>VanJS</strong> component needs consecutive string arguments. You can achieve that by inserting <code class="symbol">&lt;DUMMY&gt;</code> element between text pieces. For instance:</p><pre><code class="language-html">&lt;Link&gt;🍦VanJS&lt;DUMMY&gt;&lt;/DUMMY&gt;https://vanjs.org/&lt;/Link&gt;
</code></pre><p>will be converted to:</p><pre><code class="language-js">Link(
  "🍦VanJS",
  "https://vanjs.org/",
)
</code></pre><h2 class="w3-xxlarge w3-text-red" id="mdtovancode-convert-md-snippet-to-vanjs-code"><a class="self-link" href="#mdtovancode-convert-md-snippet-to-vanjs-code"><code class="symbol">mdToVanCode</code>: Convert MD snippet to VanJS Code</a></h2><hr style="width:50px;border:5px solid red" class="w3-round"><h3 class="w3-large w3-text-red" id="signature-1"><a class="self-link" href="#signature-1">Signature</a></h3><pre><code class="language-js">mdToVanCode(&lt;MD string&gt;, &lt;options&gt;) =&gt; {code: &lt;code&gt;, tags: &lt;tags&gt;, components: &lt;components&gt;}
</code></pre><p>Under the hood, there are 2 steps for converting an MD snippet to <strong>VanJS</strong> code:</p><ol><li>Convert the MD string into an HTML string with <a href="https://marked.js.org/" class="w3-hover-opacity">Marked</a> library.</li><li>Convert the HTML string into <strong>VanJS</strong> code with <code class="symbol">htmlToVanCode</code>.</li></ol><h3 class="w3-large w3-text-red" id="example-1"><a class="self-link" href="#example-1">Example</a></h3><pre><code class="language-js">mdToVanCode(`👋Hello
* 🗺️World
* [🍦VanJS](https://vanjs.org/)
`)
/*
The following result will be returned:
{
  code: [
    'p(',
    '  "👋Hello",',
    '),',
    'ul(',
    '  li(',
    '    "🗺️World",',
    '  ),',
    '  li(',
    '    a({href: "https://vanjs.org/"},',
    '      "🍦VanJS",',
    '    ),',
    '  ),',
    '),',
  ],
  tags: ["a", "li", "p", "ul"],
  components: [],
}
*/
</code></pre><p>Note that, you can insert custom HTML snippets, or even <a href="#using-vanjs-components" class="w3-hover-opacity">custom <strong>VanJS</strong> components</a> in the input MD string.</p><h3 class="w3-large w3-text-red" id="options-1"><a class="self-link" href="#options-1">Options</a></h3><ul><li><p><code class="symbol">indent</code>: Type <code class="symbol">number</code>. Default <code class="symbol">2</code>. Optional. The indent level of the generated <strong>VanJS code</strong>.</p></li><li><p><code class="symbol">spacing</code>: Type <code class="symbol">boolean</code>. Default <code class="symbol">false</code>. Optional. The style of the property object in the generated <strong>VanJS</strong> code. If <code class="symbol">true</code>, the property object will look like <code class="symbol">{href: "https://vanjs.org/"}</code>; Otherwise, the property object will look like <code class="symbol">{ href: "https://vanjs.org/" }</code>.</p></li><li><p><code class="symbol">htmlTagPred</code>: Type <code class="symbol">(name: string) =&gt; boolean</code>. Default <code class="symbol">s =&gt; s.toLowerCase() === s</code>. Optional. A predicate function to check whether a specific tag snippet such as <code class="symbol">&lt;Counter&gt;</code> represents a native HTML element or a custom UI component built with <strong>VanJS</strong>. By default, it will be considered a native HTML element if the letters in the <code class="symbol">name</code> are all lowercase.</p></li><li><p><code class="symbol">renderer</code>: Optional. <em>Custom renderer is only supported in the converter library, not in the UI.</em> A custom object used to override how tokens in the MD string are being rendered. The specification of the <code class="symbol">renderer</code> object can be found in Marked <a href="https://marked.js.org/using_pro#renderer" class="w3-hover-opacity">doc</a>. For instance, the <code class="symbol">renderer</code> object:</p><pre><code class="language-js">{
  codespan: s =&gt; `&lt;Symbol&gt;${s}&lt;/Symbol&gt;`,
  link: (href, _unused_title, text) =&gt; `&lt;Link&gt;${text}&lt;DUMMY&gt;&lt;/DUMMY&gt;${href}&lt;/Link&gt;`,
}
</code></pre><p>will convert <code class="symbol">`text`</code> in MD string into <code class="symbol">Symbol("text")</code> (here <code class="symbol">Symbol</code> is a custom <strong>VanJS</strong> component) instead of <code class="symbol">code("text")</code>, and will convert <code class="symbol">[text](link)</code> in MD string into <code class="symbol">Link("text", "link")</code> instead of <code class="symbol">a({href: "link"}, "text")</code>.</p></li></ul><h3 class="w3-large w3-text-red" id="return-value-1"><a class="self-link" href="#return-value-1">Return Value</a></h3><p>The same as the <a href="#return-value" class="w3-hover-opacity">return value</a> of <code class="symbol">htmlToVanCode</code>.</p><h2 class="w3-xxlarge w3-text-red" id="showroom"><a class="self-link" href="#showroom">Showroom</a></h2><hr style="width:50px;border:5px solid red" class="w3-round"><p>The <a href="https://vanjs.org/" class="w3-hover-opacity">https://vanjs.org/</a> website is using this library to keep <code class="symbol">README.md</code> files in sync with their corresponding web pages (<a href="https://github.com/vanjs-org/vanjs-org.github.io/tree/master/codegen" class="w3-hover-opacity">source code</a> of the code generation):</p><ul><li>The <a href="https://vanjs.org/vanui" class="w3-hover-opacity">VanUI</a> page is kept in sync with the <a href="https://github.com/vanjs-org/van/tree/main/components#readme" class="w3-hover-opacity"><code class="symbol">README.md</code></a> file in GitHub with the help of this library.</li><li>This <a href="https://github.com/vanjs-org/converter#readme" class="w3-hover-opacity"><code class="symbol">README.md</code></a> file is kept in sync with this <a href="https://vanjs.org/converter-lib" class="w3-hover-opacity">page</a> in <a href="https://vanjs.org/" class="w3-hover-opacity">https://vanjs.org/</a> website.</li></ul></div>
        <aside id="toc"><ul><li><a href="#installation" class="w3-hover-opacity">Installation</a></li><li><a href="#htmltovancode-convert-html-snippet-to-vanjs-code" class="w3-hover-opacity">htmlToVanCode: Convert HTML snippet to VanJS Code</a><ul><li><a href="#signature" class="w3-hover-opacity">Signature</a></li><li><a href="#example" class="w3-hover-opacity">Example</a></li><li><a href="#using-vanjs-components" class="w3-hover-opacity">Using VanJS Components</a></li><li><a href="#options" class="w3-hover-opacity">Options</a></li><li><a href="#return-value" class="w3-hover-opacity">Return Value</a></li><li><a href="#dummy" class="w3-hover-opacity">DUMMY</a></li></ul></li><li><a href="#mdtovancode-convert-md-snippet-to-vanjs-code" class="w3-hover-opacity">mdToVanCode: Convert MD snippet to VanJS Code</a><ul><li><a href="#signature-1" class="w3-hover-opacity">Signature</a></li><li><a href="#example-1" class="w3-hover-opacity">Example</a></li><li><a href="#options-1" class="w3-hover-opacity">Options</a></li><li><a href="#return-value-1" class="w3-hover-opacity">Return Value</a></li></ul></li><li><a href="#showroom" class="w3-hover-opacity">Showroom</a></li></ul></aside>
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