markdown-it-directive-webcomponents

中文指南

This plugin can convert a markdown directive (Generic directives/plugins syntax spec) to a web component (WebComponents). It needs markdown-it-directive and markdown-it as dependencies.

Install

npm i markdown-it-directive-webcomponents

API

const md = require('markdown-it')()
  .use(require('markdown-it-directive-webcomponents'), {
    components: [
      {
        present: 'both',
        name: 'directive-name',
        tag: 'tag-name',
        allowedAttrs: [ 'inline', 'src', 'title', /^prefix/ ],
        destLinkName: 'my-link-name',
        destStringName: 'my-string-name',
        parseInner: true
      },
    ]
  });

• components: Write conversion rules in this array
  • present: Which type of directive to parse. Values: inline, block, both.
  • name: The name of the directive
  • tag: The tag name of the converted component
  • allowedAttrs: Allowed attribute names. If set as an array, elements in the array can be a String or a RegEx. If not set, allow any name. (has security issues, not recommended)
  • destLinkName: Attribute name when converting link-type data in link destinations (ie. the content in ()) to attributes. src by default
  • destStringName: Attribute name when converting string-type data in link destinations to attributes. title by default
  • parseInner: Whether to continue to parse the content as Markdown or not. Bool type. if it is false, the content will be unescaped and written in the output (html < > etc. will still be escaped).

DOMPurify is recommended as a security backup.

Here are three directive formats that can be recognized:

text before :directive-name[content](/link "destination" /another "one"){.class #id name=value name="string!"} text after
 
:: directive-name [inline content] (/link "destination" /another "one") {.class #id name=value name="string!"} content title ::
 
::: directive-name [inline content] (/link "destination" /another "one") {.class #id name=value name="string!"} content title ::
content
:::

Will be converted to:

<p>text before <tag-name class="class" id="id" name="value" src="/link" title="destination" inline="">content</tag-name> text after</p>
 
<tag-name class="class" id="id" name="value" src="/link" title="destination">inline content</tag-name>
 
<tag-name class="class" id="id" name="value" src="/link" title="destination">
<p>content</p>
</tag-name>

In the conversion process, link-type value which in () will add to src attribute, and string-type value will add to title attribute. class's values will be merged together and other attributes will pick the first value.

Block-level directive, if it is the third case, it will ignore the inline content and content title, and parse the content as block; if the second case, if there is, then use inline content otherwise use content title as content and parse the content as inline.

Example

const md = require('markdown-it')()
  .use(require('markdown-it-directive-webcomponents'), {
    components: [
      {
        present: 'both',
        name: 'directive-name',
        tag: 'tag-name',
        allowedAttrs: [ 'inline', 'src', 'title', /^prefix/ ],
        parseInner: true
      },
      {
        present: 'both',
        name: 'another-directive',
        tag: 'another-tag',
        allowedAttrs: [ 'inline', 'src', 'title', /^prefix/ ],
        parseInner: false
      },
    ]
  });
 
console.dir(md.render(`
text before :directive-name[content](/link "destination" /another "one"){.class #id name=value name="string!"} text after
 
:: directive-name [inline content] (/link "destination" /another "one") {.class #id name=value name="string!"} content title ::
 
::: directive-name [inline content] (/link "destination" /another "one") {.class #id name=value name="string!"} content title ::
content
:::
 
::: another-directive
content
\\:::
:::`));
 
/* output
 
<p>text before <tag-name class="class" id="id" name="value" src="/link" title="destination" inline="">content</tag-name> text after</p>
<tag-name class="class" id="id" name="value" src="/link" title="destination">inline content</tag-name>
<tag-name class="class" id="id" name="value" src="/link" title="destination">
<p>content</p>
</tag-name>
<another-tag>
content
:::
</another-tag>
 
*/

More examples can be found in test.js.

License

MIT

Copyright (c) 2020, lookas