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mightyscape-1.1-deprecated/extensions/fablabchemnitz/svgo-inkscape/node_modules/svgo/plugins/removeHiddenElems.js
2020-08-30 12:36:33 +02:00

219 lines
6.2 KiB
JavaScript

'use strict';
exports.type = 'perItem';
exports.active = true;
exports.description = 'removes hidden elements (zero sized, with absent attributes)';
exports.params = {
displayNone: true,
opacity0: true,
circleR0: true,
ellipseRX0: true,
ellipseRY0: true,
rectWidth0: true,
rectHeight0: true,
patternWidth0: true,
patternHeight0: true,
imageWidth0: true,
imageHeight0: true,
pathEmptyD: true,
polylineEmptyPoints: true,
polygonEmptyPoints: true
};
var regValidPath = /M\s*(?:[+-]?(?:\d*\.\d+|\d+(?!\.\d)\.?)(?!\d)\s*,?\s*){2}\D*\d/i;
/**
* Remove hidden elements with disabled rendering:
* - display="none"
* - opacity="0"
* - circle with zero radius
* - ellipse with zero x-axis or y-axis radius
* - rectangle with zero width or height
* - pattern with zero width or height
* - image with zero width or height
* - path with empty data
* - polyline with empty points
* - polygon with empty points
*
* @param {Object} item current iteration item
* @param {Object} params plugin params
* @return {Boolean} if false, item will be filtered out
*
* @author Kir Belevich
*/
exports.fn = function(item, params) {
if (item.elem) {
// display="none"
//
// http://www.w3.org/TR/SVG/painting.html#DisplayProperty
// "A value of display: none indicates that the given element
// and its children shall not be rendered directly"
if (
params.displayNone &&
item.hasAttr('display', 'none')
) return false;
// opacity="0"
//
// http://www.w3.org/TR/SVG/masking.html#ObjectAndGroupOpacityProperties
if (
params.opacity0 &&
item.hasAttr('opacity', '0')
) return false;
// Circles with zero radius
//
// http://www.w3.org/TR/SVG/shapes.html#CircleElementRAttribute
// "A value of zero disables rendering of the element"
//
// <circle r="0">
if (
params.circleR0 &&
item.isElem('circle') &&
item.isEmpty() &&
item.hasAttr('r', '0')
) return false;
// Ellipse with zero x-axis radius
//
// http://www.w3.org/TR/SVG/shapes.html#EllipseElementRXAttribute
// "A value of zero disables rendering of the element"
//
// <ellipse rx="0">
if (
params.ellipseRX0 &&
item.isElem('ellipse') &&
item.isEmpty() &&
item.hasAttr('rx', '0')
) return false;
// Ellipse with zero y-axis radius
//
// http://www.w3.org/TR/SVG/shapes.html#EllipseElementRYAttribute
// "A value of zero disables rendering of the element"
//
// <ellipse ry="0">
if (
params.ellipseRY0 &&
item.isElem('ellipse') &&
item.isEmpty() &&
item.hasAttr('ry', '0')
) return false;
// Rectangle with zero width
//
// http://www.w3.org/TR/SVG/shapes.html#RectElementWidthAttribute
// "A value of zero disables rendering of the element"
//
// <rect width="0">
if (
params.rectWidth0 &&
item.isElem('rect') &&
item.isEmpty() &&
item.hasAttr('width', '0')
) return false;
// Rectangle with zero height
//
// http://www.w3.org/TR/SVG/shapes.html#RectElementHeightAttribute
// "A value of zero disables rendering of the element"
//
// <rect height="0">
if (
params.rectHeight0 &&
params.rectWidth0 &&
item.isElem('rect') &&
item.isEmpty() &&
item.hasAttr('height', '0')
) return false;
// Pattern with zero width
//
// http://www.w3.org/TR/SVG/pservers.html#PatternElementWidthAttribute
// "A value of zero disables rendering of the element (i.e., no paint is applied)"
//
// <pattern width="0">
if (
params.patternWidth0 &&
item.isElem('pattern') &&
item.hasAttr('width', '0')
) return false;
// Pattern with zero height
//
// http://www.w3.org/TR/SVG/pservers.html#PatternElementHeightAttribute
// "A value of zero disables rendering of the element (i.e., no paint is applied)"
//
// <pattern height="0">
if (
params.patternHeight0 &&
item.isElem('pattern') &&
item.hasAttr('height', '0')
) return false;
// Image with zero width
//
// http://www.w3.org/TR/SVG/struct.html#ImageElementWidthAttribute
// "A value of zero disables rendering of the element"
//
// <image width="0">
if (
params.imageWidth0 &&
item.isElem('image') &&
item.hasAttr('width', '0')
) return false;
// Image with zero height
//
// http://www.w3.org/TR/SVG/struct.html#ImageElementHeightAttribute
// "A value of zero disables rendering of the element"
//
// <image height="0">
if (
params.imageHeight0 &&
item.isElem('image') &&
item.hasAttr('height', '0')
) return false;
// Path with empty data
//
// http://www.w3.org/TR/SVG/paths.html#DAttribute
//
// <path d=""/>
if (
params.pathEmptyD &&
item.isElem('path') &&
(!item.hasAttr('d') || !regValidPath.test(item.attr('d').value))
) return false;
// Polyline with empty points
//
// http://www.w3.org/TR/SVG/shapes.html#PolylineElementPointsAttribute
//
// <polyline points="">
if (
params.polylineEmptyPoints &&
item.isElem('polyline') &&
!item.hasAttr('points')
) return false;
// Polygon with empty points
//
// http://www.w3.org/TR/SVG/shapes.html#PolygonElementPointsAttribute
//
// <polygon points="">
if (
params.polygonEmptyPoints &&
item.isElem('polygon') &&
!item.hasAttr('points')
) return false;
}
};