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svgo/plugins/removeEmptyContainers.js
Bogdan Chadkin 07f8d606e0
Implement preset-default plugin (#1513)
I saw complaints about `extendDefaultPlugins` api

- it cannot be used when svgo is installed globally
- it requires svgo to be installed when using svgo-loader or svgo-jsx
- it prevents using serializable config formats like json

In this diff I introduced the new plugin which is a bundle of all
default plugins.

```js
module.exports = {
  plugins: [
    'preset_default',
    // or
    {
      name: 'preset_default',
      floatPrecision: 4,
      overrides: {
        convertPathData: {
          applyTransforms: false
        }
      }
    }
  ]
}
```
2021-08-13 19:07:08 +03:00

46 lines
1.2 KiB
JavaScript

'use strict';
const { elemsGroups } = require('./_collections');
exports.name = 'removeEmptyContainers';
exports.type = 'perItemReverse';
exports.active = true;
exports.description = 'removes empty container elements';
/**
* Remove empty containers.
*
* @see https://www.w3.org/TR/SVG11/intro.html#TermContainerElement
*
* @example
* <defs/>
*
* @example
* <g><marker><a/></marker></g>
*
* @param {Object} item current iteration item
* @return {Boolean} if false, item will be filtered out
*
* @author Kir Belevich
*/
exports.fn = function (item) {
if (item.type === 'element') {
return (
item.children.length !== 0 ||
elemsGroups.container.includes(item.name) === false ||
item.name === 'svg' ||
// empty patterns may contain reusable configuration
(item.name === 'pattern' && Object.keys(item.attributes).length !== 0) ||
// The 'g' may not have content, but the filter may cause a rectangle
// to be created and filled with pattern.
(item.name === 'g' && item.attributes.filter != null) ||
// empty <mask> hides masked element
(item.name === 'mask' && item.attributes.id != null)
);
}
return true;
};