@accordproject/markdown-common/README.md

# CommonMark Transformer

Converts markdown text to/from a DOM.

## Usage

To transform markdown text, first install the `markdown-common` package:

```
npm install @accordproject/markdown-common --save
```

Then in your JavaScript code:

``` javascript
const CommonMarkTransformer = require('@accordproject/markdown-common').CommonMarkTransformer;
const transformer = new CommonMarkTransformer({ tagInfo : true });
const json = transformer.fromMarkdown('# Heading\n\nThis is some `code`.\n\nFin.', 'json');
console.log(JSON.stringify(json, null, 4));
```

The output should be:

``` json
{
          "$class": "org.accordproject.commonmark.Document",
          "xmlns": "http://commonmark.org/xml/1.0",
          "nodes": [
              {
                  "$class": "org.accordproject.commonmark.Heading",
                  "level": "1",
                  "nodes": [
                      {
                          "$class": "org.accordproject.commonmark.Text",
                          "text": "Heading"
                      }
                  ]
              },
              {
                  "$class": "org.accordproject.commonmark.Paragraph",
                  "nodes": [
                      {
                          "$class": "org.accordproject.commonmark.Text",
                          "text": "This is some "
                      },
                      {
                          "$class": "org.accordproject.commonmark.Code",
                          "text": "code"
                      },
                      {
                          "$class": "org.accordproject.commonmark.Text",
                          "text": "."
                      }
                  ]
              },
              {
                  "$class": "org.accordproject.commonmark.Paragraph",
                  "nodes": [
                      {
                          "$class": "org.accordproject.commonmark.Text",
                          "text": "Fin."
                      }
                  ]
              }
          ]
      }
```

Please refer to the [schema](https://models.accordproject.org/commonmark/markdown.html) for the details of all the the nodes that you should expect in the DOM.

You can then manipulate the DOM object, making any required changes:

``` javascript
json.nodes[0].nodes[0].text = 'My New Heading';
```

Finally converting the DOM back into a markdown string:

``` javascript
const newMarkdown = commonMark.toMarkdown(json);
console.log(newMarkdown);
```

The new markdown string will be:

``` markdown
My New Heading
====
      
This is some `code`.
      
Fin.
```

> Note how the original H1 heading has been normalized during conversion from `#` syntax to `====` syntax. In commonmark these are equivalent.

## License <a name="license"></a>
Accord Project source code files are made available under the Apache License, Version 2.0 (Apache-2.0), located in the LICENSE file. Accord Project documentation files are made available under the Creative Commons Attribution 4.0 International License (CC-BY-4.0), available at http://creativecommons.org/licenses/by/4.0/.

© 2017-2019 Clause, Inc.