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svgo/plugins/sortDefsChildren.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

44 lines
1.2 KiB
JavaScript

'use strict';
exports.name = 'sortDefsChildren';
exports.type = 'perItem';
exports.active = true;
exports.description = 'Sorts children of <defs> to improve compression';
/**
* Sorts children of defs in order to improve compression.
* Sorted first by frequency then by element name length then by element name (to ensure grouping).
*
* @param {Object} item current iteration item
* @return {Boolean} if false, item will be filtered out
*
* @author David Leston
*/
exports.fn = function (item) {
if (item.isElem('defs')) {
var frequency = item.children.reduce(function (frequency, child) {
if (child.name in frequency) {
frequency[child.name]++;
} else {
frequency[child.name] = 1;
}
return frequency;
}, {});
item.children.sort(function (a, b) {
var frequencyComparison = frequency[b.name] - frequency[a.name];
if (frequencyComparison !== 0) {
return frequencyComparison;
}
var lengthComparison = b.name.length - a.name.length;
if (lengthComparison !== 0) {
return lengthComparison;
}
return a.name != b.name ? (a.name > b.name ? -1 : 1) : 0;
});
return true;
}
};