'use strict';
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exports.type = 'full';
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exports.active = true;
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exports.description = 'remove or cleanup enable-background attribute when possible';
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/**
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* Remove or cleanup enable-background attr which coincides with a width/height box.
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*
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* @see http://www.w3.org/TR/SVG/filters.html#EnableBackgroundProperty
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*
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* @example
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* <svg width="100" height="50" enable-background="new 0 0 100 50">
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* ⬇
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* <svg width="100" height="50">
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*
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* @param {Object} item current iteration item
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* @return {Boolean} if false, item will be filtered out
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*
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* @author Kir Belevich
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*/
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exports.fn = function(data) {
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var regEnableBackground = /^new\s0\s0\s([\-+]?\d*\.?\d+([eE][\-+]?\d+)?)\s([\-+]?\d*\.?\d+([eE][\-+]?\d+)?)$/,
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hasFilter = false,
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elems = ['svg', 'mask', 'pattern'];
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function checkEnableBackground(item) {
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if (
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item.isElem(elems) &&
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item.hasAttr('enable-background') &&
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item.hasAttr('width') &&
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item.hasAttr('height')
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) {
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var match = item.attr('enable-background').value.match(regEnableBackground);
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if (match) {
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if (
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item.attr('width').value === match[1] &&
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item.attr('height').value === match[3]
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) {
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if (item.isElem('svg')) {
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item.removeAttr('enable-background');
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} else {
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item.attr('enable-background').value = 'new';
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}
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}
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}
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}
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}
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function checkForFilter(item) {
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if (item.isElem('filter')) {
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hasFilter = true;
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}
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}
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function monkeys(items, fn) {
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items.content.forEach(function(item) {
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fn(item);
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if (item.content) {
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monkeys(item, fn);
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}
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});
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return items;
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}
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var firstStep = monkeys(data, function(item) {
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checkEnableBackground(item);
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if (!hasFilter) {
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checkForFilter(item);
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}
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});
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return hasFilter ? firstStep : monkeys(firstStep, function(item) {
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//we don't need 'enable-background' if we have no filters
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item.removeAttr('enable-background');
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});
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};
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