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114 lines
2.9 KiB
114 lines
2.9 KiB
3 years ago
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'use strict';
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const { removeLeadingZero } = require('../lib/svgo/tools');
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exports.name = 'cleanupNumericValues';
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exports.type = 'visitor';
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exports.active = true;
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exports.description =
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'rounds numeric values to the fixed precision, removes default ‘px’ units';
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const regNumericValues =
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/^([-+]?\d*\.?\d+([eE][-+]?\d+)?)(px|pt|pc|mm|cm|m|in|ft|em|ex|%)?$/;
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const absoluteLengths = {
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// relative to px
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cm: 96 / 2.54,
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mm: 96 / 25.4,
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in: 96,
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pt: 4 / 3,
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pc: 16,
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px: 1,
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};
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/**
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* Round numeric values to the fixed precision,
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* remove default 'px' units.
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*
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* @author Kir Belevich
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*
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* @type {import('../lib/types').Plugin<{
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* floatPrecision?: number,
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* leadingZero?: boolean,
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* defaultPx?: boolean,
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* convertToPx?: boolean
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* }>}
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*/
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exports.fn = (_root, params) => {
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const {
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floatPrecision = 3,
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leadingZero = true,
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defaultPx = true,
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convertToPx = true,
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} = params;
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return {
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element: {
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enter: (node) => {
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if (node.attributes.viewBox != null) {
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const nums = node.attributes.viewBox.split(/\s,?\s*|,\s*/g);
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node.attributes.viewBox = nums
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.map((value) => {
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const num = Number(value);
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return Number.isNaN(num)
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? value
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: Number(num.toFixed(floatPrecision));
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})
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.join(' ');
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}
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for (const [name, value] of Object.entries(node.attributes)) {
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// The `version` attribute is a text string and cannot be rounded
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if (name === 'version') {
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continue;
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}
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const match = value.match(regNumericValues);
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// if attribute value matches regNumericValues
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if (match) {
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// round it to the fixed precision
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let num = Number(Number(match[1]).toFixed(floatPrecision));
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/**
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* @type {any}
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*/
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let matchedUnit = match[3] || '';
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/**
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* @type{'' | keyof typeof absoluteLengths}
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*/
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let units = matchedUnit;
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// convert absolute values to pixels
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if (convertToPx && units !== '' && units in absoluteLengths) {
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const pxNum = Number(
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(absoluteLengths[units] * Number(match[1])).toFixed(
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floatPrecision
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)
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);
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if (pxNum.toString().length < match[0].length) {
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num = pxNum;
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units = 'px';
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}
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}
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// and remove leading zero
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let str;
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if (leadingZero) {
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str = removeLeadingZero(num);
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} else {
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str = num.toString();
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}
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// remove default 'px' units
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if (defaultPx && units === 'px') {
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units = '';
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}
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node.attributes[name] = str + units;
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}
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}
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},
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},
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};
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};
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