155 lines
3.9 KiB
JavaScript
155 lines
3.9 KiB
JavaScript
'use strict';
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const { removeLeadingZero } = require('../lib/svgo/tools.js');
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exports.name = 'cleanupListOfValues';
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exports.type = 'visitor';
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exports.active = false;
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exports.description = 'rounds list of values to the fixed precision';
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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 regSeparator = /\s+,?\s*|,\s*/;
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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 list of values to the fixed precision.
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*
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* @example
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* <svg viewBox="0 0 200.28423 200.28423" enable-background="new 0 0 200.28423 200.28423">
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* ⬇
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* <svg viewBox="0 0 200.284 200.284" enable-background="new 0 0 200.284 200.284">
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*
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* <polygon points="208.250977 77.1308594 223.069336 ... "/>
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* ⬇
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* <polygon points="208.251 77.131 223.069 ... "/>
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*
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* @author kiyopikko
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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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/**
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* @type {(lists: string) => string}
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*/
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const roundValues = (lists) => {
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const roundedList = [];
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for (const elem of lists.split(regSeparator)) {
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const match = elem.match(regNumericValues);
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const matchNew = elem.match(/new/);
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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(floatPrecision)
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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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roundedList.push(str + units);
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}
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// if attribute value is "new"(only enable-background).
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else if (matchNew) {
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roundedList.push('new');
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} else if (elem) {
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roundedList.push(elem);
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}
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}
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return roundedList.join(' ');
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};
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return {
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element: {
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enter: (node) => {
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if (node.attributes.points != null) {
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node.attributes.points = roundValues(node.attributes.points);
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}
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if (node.attributes['enable-background'] != null) {
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node.attributes['enable-background'] = roundValues(
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node.attributes['enable-background']
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);
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}
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if (node.attributes.viewBox != null) {
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node.attributes.viewBox = roundValues(node.attributes.viewBox);
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}
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if (node.attributes['stroke-dasharray'] != null) {
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node.attributes['stroke-dasharray'] = roundValues(
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node.attributes['stroke-dasharray']
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);
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}
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if (node.attributes.dx != null) {
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node.attributes.dx = roundValues(node.attributes.dx);
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}
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if (node.attributes.dy != null) {
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node.attributes.dy = roundValues(node.attributes.dy);
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}
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if (node.attributes.x != null) {
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node.attributes.x = roundValues(node.attributes.x);
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}
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if (node.attributes.y != null) {
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node.attributes.y = roundValues(node.attributes.y);
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}
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},
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},
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};
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};
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