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Viewing file:     sortDefsChildren.js (1.37 KB)      -rw-r--r--

'use strict';

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')) {

        if (item.content) {
            var 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) {
                var frequencyComparison = frequency[b.elem] - frequency[a.elem];
                if (frequencyComparison !== 0 ) {
                    return frequencyComparison;
                }
                var 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;
    }

};