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'use strict';
const { visit, visitSkip, detachNodeFromParent } = require('../lib/xast.js');
const { collectStylesheet, computeStyle } = require('../lib/style.js');
const { elemsGroups } = require('./_collections.js');
exports.name = 'removeUselessStrokeAndFill';
exports.description = 'removes useless stroke and fill attributes';
/**
* Remove useless stroke and fill attrs.
*
* @author Kir Belevich
*
* @type {import('./plugins-types').Plugin<'removeUselessStrokeAndFill'>}
*/
exports.fn = (root, params) => {
const {
stroke: removeStroke = true,
fill: removeFill = true,
removeNone = false,
} = params;
// style and script elements deoptimise this plugin
let hasStyleOrScript = false;
visit(root, {
element: {
enter: (node) => {
if (node.name === 'style' || node.name === 'script') {
hasStyleOrScript = true;
}
},
},
});
if (hasStyleOrScript) {
return null;
}
const stylesheet = collectStylesheet(root);
return {
element: {
enter: (node, parentNode) => {
// id attribute deoptimise the whole subtree
if (node.attributes.id != null) {
return visitSkip;
}
if (elemsGroups.shape.includes(node.name) == false) {
return;
}
const computedStyle = computeStyle(stylesheet, node);
const stroke = computedStyle.stroke;
const strokeOpacity = computedStyle['stroke-opacity'];
const strokeWidth = computedStyle['stroke-width'];
const markerEnd = computedStyle['marker-end'];
const fill = computedStyle.fill;
const fillOpacity = computedStyle['fill-opacity'];
const computedParentStyle =
parentNode.type === 'element'
? computeStyle(stylesheet, parentNode)
: null;
const parentStroke =
computedParentStyle == null ? null : computedParentStyle.stroke;
// remove stroke*
if (removeStroke) {
if (
stroke == null ||
(stroke.type === 'static' && stroke.value == 'none') ||
(strokeOpacity != null &&
strokeOpacity.type === 'static' &&
strokeOpacity.value === '0') ||
(strokeWidth != null &&
strokeWidth.type === 'static' &&
strokeWidth.value === '0')
) {
// stroke-width may affect the size of marker-end
// marker is not visible when stroke-width is 0
if (
(strokeWidth != null &&
strokeWidth.type === 'static' &&
strokeWidth.value === '0') ||
markerEnd == null
) {
for (const name of Object.keys(node.attributes)) {
if (name.startsWith('stroke')) {
delete node.attributes[name];
}
}
// set explicit none to not inherit from parent
if (
parentStroke != null &&
parentStroke.type === 'static' &&
parentStroke.value !== 'none'
) {
node.attributes.stroke = 'none';
}
}
}
}
// remove fill*
if (removeFill) {
if (
(fill != null && fill.type === 'static' && fill.value === 'none') ||
(fillOpacity != null &&
fillOpacity.type === 'static' &&
fillOpacity.value === '0')
) {
for (const name of Object.keys(node.attributes)) {
if (name.startsWith('fill-')) {
delete node.attributes[name];
}
}
if (
fill == null ||
(fill.type === 'static' && fill.value !== 'none')
) {
node.attributes.fill = 'none';
}
}
}
if (removeNone) {
if (
(stroke == null || node.attributes.stroke === 'none') &&
((fill != null &&
fill.type === 'static' &&
fill.value === 'none') ||
node.attributes.fill === 'none')
) {
detachNodeFromParent(node, parentNode);
}
}
},
},
};
};
|
