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sortDefsChildren.js
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sortDefsChildren.js
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const name = 'sortDefsChildren'
const type = 'perItem'
const active = true
const description = 'Sorts children of <defs> to improve compression'
const params = {}
/**
* 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
*/
const fn = function (item) {
if (item.isElem('defs')) {
if (item.content) {
const frequency = item.content.reduce(function (frequency, child) {
if (child.elem in frequency) {
frequency[ child.elem ]++
} else {
frequency[ child.elem ] = 1
}
return frequency
}, {})
item.content.sort(function (a, b) {
const frequencyComparison = frequency[ b.elem ] - frequency[ a.elem ]
if (frequencyComparison !== 0) {
return frequencyComparison
}
const lengthComparison = b.elem.length - a.elem.length
if (lengthComparison !== 0) {
return lengthComparison
}
return a.elem !== b.elem ? a.elem > b.elem ? -1 : 1 : 0
})
}
return true
}
}
export { name, type, active, description, params, fn }