# CKEditor 5 mathematical feature

This is the best TeX-based mathematical plugin for CKEditor 5. You can use it to insert, edit and view mathematical equation and formulas. This plugin supports MathJax, KaTeX and custom typesetting engines.

## Demo (todo)
[Link to classic editor demo](https://www.example.com)

[Link to inline editor demo](https://www.example.com)

## Installation
Install plugin with NPM or Yarn

`npm install ckeditor5-math --save-dev`

Add import into ckeditor.js file

```js
import Mathematics from 'ckeditor5-math/src/math';
```

Add it to builtinPlugins

```js
InlineEditor.builtinPlugins = [
	// ...
	Mathematics,
	// ...
];
```

__Add math button to toolbar__ and optional math config to default config

```js
InlineEditor.defaultConfig = {
	toolbar: {
		items: [
			// ...
			'math',
			// ...
		]
	},
	// ...
	math: {
		engine: 'mathjax',
		outputType: 'script',
		forceOutputType: false
	},
	// ...
};
```
### Copying plugin's theme for Lark
Copy __theme/ckeditor5-link__ folder from [https://github.com/isaul32/ckeditor5-theme-lark](https://github.com/isaul32/ckeditor5-theme-lark) to your lark theme repository fork.

## Supported input and output formats
Supported input and output formats are:
```html
<!-- MathJax style http://docs.mathjax.org/en/v2.7-latest/advanced/model.html#how-mathematics-is-stored-in-the-page -->
<script type="math/tex">\sqrt{\frac{a}{b}}</script>
<script type="math/tex; mode=display">\sqrt{\frac{a}{b}}</script>
<!-- CKEditor 4 style https://ckeditor.com/docs/ckeditor4/latest/features/mathjax.html -->
<span class="math-tex">\( \sqrt{\frac{a}{b}} \)</span>
<span class="math-tex">\[ \sqrt{\frac{a}{b}} \]</span>
```

## Available typesetting engines
### MathJax
- Tested by using version __2.7.5__ and __TeX-MML-AM_HTMLorMML__ configuration
- Use __\\( \\)__ delimiters for inline and __\\[ \\]__ delimiters for display
### KaTeX
- Tested by using version __0.11.0__
- Doesn't support preview feature because __.ck-reset_all *__ css rules from ckeditor5-ui and ckeditor5-theme-lark breaks it.
### Custom
It's possible to implement with _engine: (__equation__, __element__, __display__) => { ... }_ math config.
- __equation__ is equation in TeX format without delimiters
- __element__ is DOM element reserved for rendering
- __display__ is boolean. Typesetting should be inline when false


## Plugin options
```js
InlineEditor.defaultConfig = {
    // ...
    math: {
        engine: 'mathjax', // or katex or function (equation, element, display) => { ... }
        outputType: 'script', // or span
        forceOutputType: false // forces output to use outputType
    }
    // ...
}
```
## Styles
- Styles requires PostCSS like offical CKEditor plugins
- 
## Todo
- AutoMath like AutoMediaEmbed
- Convert equation images to mathtex when paste from word
- Fix KaTex preview
- Make better way import lark theme for plugin