vue hello world项目
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3 years ago
'use strict';
/**
* @typedef {import('../lib/types').PathDataItem} PathDataItem
*/
const { stringifyPathData } = require('../lib/path.js');
const { detachNodeFromParent } = require('../lib/xast.js');
exports.name = 'convertShapeToPath';
exports.type = 'visitor';
exports.active = true;
exports.description = 'converts basic shapes to more compact path form';
const regNumber = /[-+]?(?:\d*\.\d+|\d+\.?)(?:[eE][-+]?\d+)?/g;
/**
* Converts basic shape to more compact path.
* It also allows further optimizations like
* combining paths with similar attributes.
*
* @see https://www.w3.org/TR/SVG11/shapes.html
*
* @author Lev Solntsev
*
* @type {import('../lib/types').Plugin<{
* convertArcs?: boolean,
* floatPrecision?: number
* }>}
*/
exports.fn = (root, params) => {
const { convertArcs = false, floatPrecision: precision } = params;
return {
element: {
enter: (node, parentNode) => {
// convert rect to path
if (
node.name === 'rect' &&
node.attributes.width != null &&
node.attributes.height != null &&
node.attributes.rx == null &&
node.attributes.ry == null
) {
const x = Number(node.attributes.x || '0');
const y = Number(node.attributes.y || '0');
const width = Number(node.attributes.width);
const height = Number(node.attributes.height);
// Values like '100%' compute to NaN, thus running after
// cleanupNumericValues when 'px' units has already been removed.
// TODO: Calculate sizes from % and non-px units if possible.
if (Number.isNaN(x - y + width - height)) return;
/**
* @type {Array<PathDataItem>}
*/
const pathData = [
{ command: 'M', args: [x, y] },
{ command: 'H', args: [x + width] },
{ command: 'V', args: [y + height] },
{ command: 'H', args: [x] },
{ command: 'z', args: [] },
];
node.name = 'path';
node.attributes.d = stringifyPathData({ pathData, precision });
delete node.attributes.x;
delete node.attributes.y;
delete node.attributes.width;
delete node.attributes.height;
}
// convert line to path
if (node.name === 'line') {
const x1 = Number(node.attributes.x1 || '0');
const y1 = Number(node.attributes.y1 || '0');
const x2 = Number(node.attributes.x2 || '0');
const y2 = Number(node.attributes.y2 || '0');
if (Number.isNaN(x1 - y1 + x2 - y2)) return;
/**
* @type {Array<PathDataItem>}
*/
const pathData = [
{ command: 'M', args: [x1, y1] },
{ command: 'L', args: [x2, y2] },
];
node.name = 'path';
node.attributes.d = stringifyPathData({ pathData, precision });
delete node.attributes.x1;
delete node.attributes.y1;
delete node.attributes.x2;
delete node.attributes.y2;
}
// convert polyline and polygon to path
if (
(node.name === 'polyline' || node.name === 'polygon') &&
node.attributes.points != null
) {
const coords = (node.attributes.points.match(regNumber) || []).map(
Number
);
if (coords.length < 4) {
detachNodeFromParent(node, parentNode);
return;
}
/**
* @type {Array<PathDataItem>}
*/
const pathData = [];
for (let i = 0; i < coords.length; i += 2) {
pathData.push({
command: i === 0 ? 'M' : 'L',
args: coords.slice(i, i + 2),
});
}
if (node.name === 'polygon') {
pathData.push({ command: 'z', args: [] });
}
node.name = 'path';
node.attributes.d = stringifyPathData({ pathData, precision });
delete node.attributes.points;
}
// optionally convert circle
if (node.name === 'circle' && convertArcs) {
const cx = Number(node.attributes.cx || '0');
const cy = Number(node.attributes.cy || '0');
const r = Number(node.attributes.r || '0');
if (Number.isNaN(cx - cy + r)) {
return;
}
/**
* @type {Array<PathDataItem>}
*/
const pathData = [
{ command: 'M', args: [cx, cy - r] },
{ command: 'A', args: [r, r, 0, 1, 0, cx, cy + r] },
{ command: 'A', args: [r, r, 0, 1, 0, cx, cy - r] },
{ command: 'z', args: [] },
];
node.name = 'path';
node.attributes.d = stringifyPathData({ pathData, precision });
delete node.attributes.cx;
delete node.attributes.cy;
delete node.attributes.r;
}
// optionally covert ellipse
if (node.name === 'ellipse' && convertArcs) {
const ecx = Number(node.attributes.cx || '0');
const ecy = Number(node.attributes.cy || '0');
const rx = Number(node.attributes.rx || '0');
const ry = Number(node.attributes.ry || '0');
if (Number.isNaN(ecx - ecy + rx - ry)) {
return;
}
/**
* @type {Array<PathDataItem>}
*/
const pathData = [
{ command: 'M', args: [ecx, ecy - ry] },
{ command: 'A', args: [rx, ry, 0, 1, 0, ecx, ecy + ry] },
{ command: 'A', args: [rx, ry, 0, 1, 0, ecx, ecy - ry] },
{ command: 'z', args: [] },
];
node.name = 'path';
node.attributes.d = stringifyPathData({ pathData, precision });
delete node.attributes.cx;
delete node.attributes.cy;
delete node.attributes.rx;
delete node.attributes.ry;
}
},
},
};
};