mirror of
https://github.com/simple-icons/simple-icons.git
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2d91a307b8
* Add lint rule to unify closing tags format * Apply suggestions from code review * Simplify lint rule logic * Clarify error message * Fix 'extraneous' rule and remove part of 'svg-format' Co-authored-by: Eric Cornelissen <ericornelissen@gmail.com>
586 lines
25 KiB
JavaScript
586 lines
25 KiB
JavaScript
const fs = require('fs');
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const data = require("./_data/simple-icons.json");
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const { htmlFriendlyToTitle } = require("./scripts/utils.js");
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const svgpath = require("svgpath");
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const svgPathBbox = require("svg-path-bbox");
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const parsePath = require("svg-path-segments");
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const svgRegexp = /^<svg( [^\s]*=".*"){3}><title>.*<\/title><path d=".*"\/><\/svg>\r?\n?$/;
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const negativeZerosRegexp = /-0(?=[^\.]|[\s\d\w]|$)/g;
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const iconSize = 24;
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const iconFloatPrecision = 3;
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const iconMaxFloatPrecision = 5;
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const iconTolerance = 0.001;
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// set env SI_UPDATE_IGNORE to recreate the ignore file
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const updateIgnoreFile = process.env.SI_UPDATE_IGNORE === 'true';
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const ignoreFile = "./.svglint-ignored.json";
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const iconIgnored = !updateIgnoreFile ? require(ignoreFile) : {};
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function sortObjectByKey(obj) {
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return Object
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.keys(obj)
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.sort()
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.reduce((r, k) => Object.assign(r, { [k]: obj[k] }), {});
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}
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function sortObjectByValue(obj) {
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return Object
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.keys(obj)
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.sort((a, b) => ('' + obj[a]).localeCompare(obj[b]))
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.reduce((r, k) => Object.assign(r, { [k]: obj[k] }), {});
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}
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function removeLeadingZeros(number) {
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// convert 0.03 to '.03'
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return number.toString().replace(/^(-?)(0)(\.?.+)/, '$1$3');
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}
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/**
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* Given three points, returns if the middle one (x2, y2) is collinear
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* to the line formed by the two limit points.
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**/
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function collinear(x1, y1, x2, y2, x3, y3) {
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return (x1 * (y2 - y3) + x2 * (y3 - y1) + x3 * (y1 - y2)) === 0;
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}
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/**
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* Returns the number of digits after the decimal point.
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* @param num The number of interest.
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*/
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function countDecimals(num) {
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if (num && num % 1) {
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let [base, op, trail] = num.toExponential().split(/e([+-])/);
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let elen = parseInt(trail, 10);
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let idx = base.indexOf('.');
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return idx == -1 ? elen : base.length - idx - 1 + (op === '+' ? -elen : elen);
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}
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return 0;
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};
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/**
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* Get the index at which the first path value of an SVG starts.
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* @param svgFileContent The raw SVG as text.
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*/
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function getPathDIndex(svgFileContent) {
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const pathDStart = '<path d="';
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return svgFileContent.indexOf(pathDStart) + pathDStart.length;
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}
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if (updateIgnoreFile) {
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process.on('exit', () => {
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// ensure object output order is consistent due to async svglint processing
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const sorted = sortObjectByKey(iconIgnored)
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for (const linterName in sorted) {
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sorted[linterName] = sortObjectByValue(sorted[linterName])
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}
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fs.writeFileSync(
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ignoreFile,
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JSON.stringify(sorted, null, 2) + '\n',
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{flag: 'w'}
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);
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});
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}
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function isIgnored(linterName, path) {
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return iconIgnored[linterName] && iconIgnored[linterName].hasOwnProperty(path);
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}
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function ignoreIcon(linterName, path, $) {
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if (!iconIgnored[linterName]) {
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iconIgnored[linterName] = {};
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}
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const title = $.find("title").text();
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const iconName = htmlFriendlyToTitle(title);
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iconIgnored[linterName][path] = iconName;
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}
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module.exports = {
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rules: {
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elm: {
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"svg": 1,
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"svg > title": 1,
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"svg > path": 1,
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"*": false,
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},
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attr: [
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{ // ensure that the SVG elm has the appropriate attrs
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"role": "img",
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"viewBox": `0 0 ${iconSize} ${iconSize}`,
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"xmlns": "http://www.w3.org/2000/svg",
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"rule::selector": "svg",
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"rule::whitelist": true,
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},
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{ // ensure that the title elm has the appropriate attr
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"rule::selector": "svg > title",
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"rule::whitelist": true,
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},
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{ // ensure that the path element only has the 'd' attr (no style, opacity, etc.)
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"d": /^[,a-zA-Z0-9\. -]+$/,
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"rule::selector": "svg > path",
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"rule::whitelist": true,
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}
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],
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custom: [
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function(reporter, $, ast) {
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reporter.name = "icon-title";
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const iconTitleText = $.find("title").text();
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const iconName = htmlFriendlyToTitle(iconTitleText);
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const iconExists = data.icons.some(icon => icon.title === iconName);
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if (!iconExists) {
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reporter.error(`No icon with title "${iconName}" found in simple-icons.json`);
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}
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},
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function(reporter, $, ast) {
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reporter.name = "icon-size";
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const iconPath = $.find("path").attr("d");
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if (!updateIgnoreFile && isIgnored(reporter.name, iconPath)) {
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return;
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}
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const [minX, minY, maxX, maxY] = svgPathBbox(iconPath);
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const width = +(maxX - minX).toFixed(iconFloatPrecision);
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const height = +(maxY - minY).toFixed(iconFloatPrecision);
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if (width === 0 && height === 0) {
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reporter.error("Path bounds were reported as 0 x 0; check if the path is valid");
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if (updateIgnoreFile) {
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ignoreIcon(reporter.name, iconPath, $);
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}
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} else if (width !== iconSize && height !== iconSize) {
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reporter.error(`Size of <path> must be exactly ${iconSize} in one dimension; the size is currently ${width} x ${height}`);
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if (updateIgnoreFile) {
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ignoreIcon(reporter.name, iconPath, $);
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}
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}
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},
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function(reporter, $, ast) {
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reporter.name = "icon-precision";
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const iconPath = $.find("path").attr("d");
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if (!updateIgnoreFile && isIgnored(reporter.name, iconPath)) {
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return;
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}
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const segments = parsePath(iconPath),
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svgFileContent = $.html();
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segments.forEach((segment) => {
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const precisionMax = Math.max(...segment.params.slice(1).map(countDecimals));
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if (precisionMax > iconMaxFloatPrecision) {
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let errorMsg = `found ${precisionMax} decimals in segment "${iconPath.substring(segment.start, segment.end)}"`;
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if (segment.chained) {
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let readableChain = iconPath.substring(segment.chainStart, segment.chainEnd);
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if (readableChain.length > 20) {
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readableChain = `${readableChain.substring(0, 20)}...`;
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}
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errorMsg += ` of chain "${readableChain}"`
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}
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errorMsg += ` at index ${segment.start + getPathDIndex(svgFileContent)}`;
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reporter.error(`Maximum precision should not be greater than ${iconMaxFloatPrecision}; ${errorMsg}`);
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if (updateIgnoreFile) {
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ignoreIcon(reporter.name, iconPath, $);
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}
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}
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})
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},
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function(reporter, $, ast) {
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reporter.name = "ineffective-segments";
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const iconPath = $.find("path").attr("d");
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if (!updateIgnoreFile && isIgnored(reporter.name, iconPath)) {
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return;
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}
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const segments = parsePath(iconPath);
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const absSegments = svgpath(iconPath).abs().unshort().segments;
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const lowerMovementCommands = ['m', 'l'];
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const lowerDirectionCommands = ['h', 'v'];
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const lowerCurveCommand = 'c';
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const lowerShorthandCurveCommand = 's';
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const lowerCurveCommands = [lowerCurveCommand, lowerShorthandCurveCommand];
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const upperMovementCommands = ['M', 'L'];
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const upperHorDirectionCommand = 'H';
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const upperVerDirectionCommand = 'V';
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const upperDirectionCommands = [upperHorDirectionCommand, upperVerDirectionCommand];
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const upperCurveCommand = 'C';
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const upperShorthandCurveCommand = 'S';
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const upperCurveCommands = [upperCurveCommand, upperShorthandCurveCommand];
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const curveCommands = [...lowerCurveCommands, ...upperCurveCommands];
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const commands = [...lowerMovementCommands, ...lowerDirectionCommands, ...upperMovementCommands, ...upperDirectionCommands, ...curveCommands];
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const isInvalidSegment = ([command, x1Coord, y1Coord, ...rest], index) => {
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if (commands.includes(command)) {
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// Relative directions (h or v) having a length of 0
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if (lowerDirectionCommands.includes(command) && x1Coord === 0) {
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return true;
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}
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// Relative movement (m or l) having a distance of 0
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if (index > 0 && lowerMovementCommands.includes(command) && x1Coord === 0 && y1Coord === 0) {
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return true;
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}
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if (lowerCurveCommands.includes(command) && x1Coord === 0 && y1Coord === 0) {
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const [x2Coord, y2Coord] = rest;
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if (
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// Relative shorthand curve (s) having a control point of 0
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command === lowerShorthandCurveCommand ||
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// Relative bézier curve (c) having control points of 0
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(command === lowerCurveCommand && x2Coord === 0 && y2Coord === 0)
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) {
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return true;
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}
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}
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if (index > 0) {
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let [yPrevCoord, xPrevCoord] = [...absSegments[index - 1]].reverse();
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// If the previous command was a direction one, we need to iterate back until we find the missing coordinates
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if (upperDirectionCommands.includes(xPrevCoord)) {
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xPrevCoord = undefined;
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yPrevCoord = undefined;
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let idx = index;
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while (--idx > 0 && (xPrevCoord === undefined || yPrevCoord === undefined)) {
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let [yPrevCoordDeep, xPrevCoordDeep] = [...absSegments[idx]].reverse();
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// If the previous command was a horizontal movement, we need to consider the single coordinate as x
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if (upperHorDirectionCommand === xPrevCoordDeep) {
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xPrevCoordDeep = yPrevCoordDeep;
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yPrevCoordDeep = undefined;
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}
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// If the previous command was a vertical movement, we need to consider the single coordinate as y
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if (upperVerDirectionCommand === xPrevCoordDeep) {
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xPrevCoordDeep = undefined;
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}
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if (xPrevCoord === undefined && xPrevCoordDeep !== undefined) {
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xPrevCoord = xPrevCoordDeep;
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}
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if (yPrevCoord === undefined && yPrevCoordDeep !== undefined) {
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yPrevCoord = yPrevCoordDeep;
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}
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}
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}
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if (upperCurveCommands.includes(command)) {
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const [x2Coord, y2Coord, xCoord, yCoord] = rest;
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// Absolute shorthand curve (S) having the same coordinate as the previous segment and a control point equal to the ending point
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if (upperShorthandCurveCommand === command && x1Coord === xPrevCoord && y1Coord === yPrevCoord && x1Coord === x2Coord && y1Coord === y2Coord) {
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return true;
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}
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// Absolute bézier curve (C) having the same coordinate as the previous segment and last control point equal to the ending point
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if (upperCurveCommand === command && x1Coord === xPrevCoord && y1Coord === yPrevCoord && x2Coord === xCoord && y2Coord === yCoord) {
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return true;
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}
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}
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return (
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// Absolute horizontal direction (H) having the same x coordinate as the previous segment
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(upperHorDirectionCommand === command && x1Coord === xPrevCoord) ||
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// Absolute vertical direction (V) having the same y coordinate as the previous segment
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(upperVerDirectionCommand === command && x1Coord === yPrevCoord) ||
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// Absolute movement (M or L) having the same coordinate as the previous segment
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(upperMovementCommands.includes(command) && x1Coord === xPrevCoord && y1Coord === yPrevCoord)
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);
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}
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}
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};
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const svgFileContent = $.html();
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segments.forEach((segment, index) => {
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if (isInvalidSegment(segment.params, index)) {
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const [command, x1, y1, ...rest] = segment.params;
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let errorMsg = `Innefective segment "${iconPath.substring(segment.start, segment.end)}" found`,
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resolutionTip = 'should be removed';
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if (curveCommands.includes(command)) {
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const [x2, y2, x, y] = rest;
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if (command === lowerShorthandCurveCommand && (x2 !== 0 || y2 !== 0)) {
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resolutionTip = `should be "l${removeLeadingZeros(x2)} ${removeLeadingZeros(y2)}" or removed`;
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}
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if (command === upperShorthandCurveCommand) {
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resolutionTip = `should be "L${removeLeadingZeros(x2)} ${removeLeadingZeros(y2)}" or removed`;
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}
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if (command === lowerCurveCommand && (x !== 0 || y !== 0)) {
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resolutionTip = `should be "l${removeLeadingZeros(x)} ${removeLeadingZeros(y)}" or removed`;
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}
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if (command === upperCurveCommand) {
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resolutionTip = `should be "L${removeLeadingZeros(x)} ${removeLeadingZeros(y)}" or removed`;
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}
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};
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if (segment.chained) {
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let readableChain = iconPath.substring(segment.chainStart, segment.chainEnd);
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if (readableChain.length > 20) {
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readableChain = `${chain.substring(0, 20)}...`
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}
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errorMsg += ` in chain "${readableChain}"`
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}
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errorMsg += ` at index ${segment.start + getPathDIndex(svgFileContent)}`;
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reporter.error(`${errorMsg} (${resolutionTip})`);
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if (updateIgnoreFile) {
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ignoreIcon(reporter.name, iconPath, $);
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}
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}
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})
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},
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function(reporter, $, ast) {
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reporter.name = "collinear-segments";
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const iconPath = $.find("path").attr("d");
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if (!updateIgnoreFile && isIgnored(reporter.name, iconPath)) {
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return;
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}
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/**
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* Extracts collinear coordinates from SVG path straight lines
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* (does not extracts collinear coordinates from curves).
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**/
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const getCollinearSegments = (iconPath) => {
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const segments = parsePath(iconPath),
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collinearSegments = [],
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straightLineCommands = 'HhVvLlMm',
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zCommands = 'Zz';
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let currLine = [],
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currAbsCoord = [undefined, undefined],
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startPoint,
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_inStraightLine = false,
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_nextInStraightLine = false,
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_resetStartPoint = false;
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for (let s = 0; s < segments.length; s++) {
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let seg = segments[s].params,
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cmd = seg[0],
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nextCmd = s + 1 < segments.length ? segments[s + 1][0] : null;
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if (cmd === 'L') {
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currAbsCoord[0] = seg[1];
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currAbsCoord[1] = seg[2];
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} else if (cmd === 'l') {
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currAbsCoord[0] = (!currAbsCoord[0] ? 0 : currAbsCoord[0]) + seg[1];
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currAbsCoord[1] = (!currAbsCoord[1] ? 0 : currAbsCoord[1]) + seg[2];
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} else if (cmd === 'm') {
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currAbsCoord[0] = (!currAbsCoord[0] ? 0 : currAbsCoord[0]) + seg[1];
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currAbsCoord[1] = (!currAbsCoord[1] ? 0 : currAbsCoord[1]) + seg[2];
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startPoint = undefined;
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} else if (cmd === 'M') {
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currAbsCoord[0] = seg[1];
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currAbsCoord[1] = seg[2];
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startPoint = undefined;
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} else if (cmd === 'H') {
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currAbsCoord[0] = seg[1];
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} else if (cmd === 'h') {
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currAbsCoord[0] = (!currAbsCoord[0] ? 0 : currAbsCoord[0]) + seg[1];
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} else if (cmd === 'V') {
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currAbsCoord[1] = seg[1];
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} else if (cmd === 'v') {
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currAbsCoord[1] = (!currAbsCoord[1] ? 0 : currAbsCoord[1]) + seg[1];
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} else if (cmd === 'C') {
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currAbsCoord[0] = seg[5];
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currAbsCoord[1] = seg[6];
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} else if (cmd === "a") {
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currAbsCoord[0] = (!currAbsCoord[0] ? 0 : currAbsCoord[0]) + seg[6];
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currAbsCoord[1] = (!currAbsCoord[1] ? 0 : currAbsCoord[1]) + seg[7];
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} else if (cmd === "A") {
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currAbsCoord[0] = seg[6];
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currAbsCoord[1] = seg[7];
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} else if (cmd === "s") {
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currAbsCoord[0] = (!currAbsCoord[0] ? 0 : currAbsCoord[0]) + seg[1];
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currAbsCoord[1] = (!currAbsCoord[1] ? 0 : currAbsCoord[1]) + seg[2];
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} else if (cmd === "S") {
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currAbsCoord[0] = seg[1];
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currAbsCoord[1] = seg[2];
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} else if (cmd === "t") {
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currAbsCoord[0] = (!currAbsCoord[0] ? 0 : currAbsCoord[0]) + seg[1];
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currAbsCoord[1] = (!currAbsCoord[1] ? 0 : currAbsCoord[1]) + seg[2];
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} else if (cmd === "T") {
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currAbsCoord[0] = seg[1];
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currAbsCoord[1] = seg[2];
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} else if (cmd === 'c') {
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currAbsCoord[0] = (!currAbsCoord[0] ? 0 : currAbsCoord[0]) + seg[5];
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currAbsCoord[1] = (!currAbsCoord[1] ? 0 : currAbsCoord[1]) + seg[6];
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} else if (cmd === 'Q') {
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currAbsCoord[0] = seg[3];
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currAbsCoord[1] = seg[4];
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} else if (cmd === 'q') {
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currAbsCoord[0] = (!currAbsCoord[0] ? 0 : currAbsCoord[0]) + seg[3];
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currAbsCoord[1] = (!currAbsCoord[1] ? 0 : currAbsCoord[1]) + seg[4];
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} else if (zCommands.includes(cmd)) {
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// Overlapping in Z should be handled in another rule
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currAbsCoord = [startPoint[0], startPoint[1]];
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_resetStartPoint = true;
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} else {
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throw new Error(`"${cmd}" command not handled`);
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}
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if (startPoint === undefined) {
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startPoint = [currAbsCoord[0], currAbsCoord[1]];
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} else if (_resetStartPoint) {
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startPoint = undefined;
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_resetStartPoint = false;
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}
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_nextInStraightLine = straightLineCommands.includes(nextCmd);
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let _exitingStraightLine = (_inStraightLine && !_nextInStraightLine);
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_inStraightLine = straightLineCommands.includes(cmd);
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if (_inStraightLine) {
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currLine.push([currAbsCoord[0], currAbsCoord[1]]);
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} else {
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if (_exitingStraightLine) {
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if (straightLineCommands.includes(cmd)) {
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currLine.push([currAbsCoord[0], currAbsCoord[1]]);
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}
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// Get collinear coordinates
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for (let p = 1; p < currLine.length - 1; p++) {
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let _collinearCoord = collinear(currLine[p - 1][0],
|
|
currLine[p - 1][1],
|
|
currLine[p][0],
|
|
currLine[p][1],
|
|
currLine[p + 1][0],
|
|
currLine[p + 1][1]);
|
|
if (_collinearCoord) {
|
|
collinearSegments.push(
|
|
segments[s - currLine.length + p + 1]
|
|
);
|
|
}
|
|
}
|
|
}
|
|
currLine = [];
|
|
}
|
|
}
|
|
|
|
return collinearSegments;
|
|
}
|
|
|
|
const collinearSegments = getCollinearSegments(iconPath),
|
|
pathDIndex = getPathDIndex($.html());
|
|
collinearSegments.forEach((segment) => {
|
|
let errorMsg = `Collinear segment "${iconPath.substring(segment.start, segment.end)}" found`
|
|
if (segment.chained) {
|
|
let readableChain = iconPath.substring(segment.chainStart, segment.chainEnd);
|
|
if (readableChain.length > 20) {
|
|
readableChain = `${readableChain.substring(0, 20)}...`
|
|
}
|
|
errorMsg += ` in chain "${readableChain}"`;
|
|
}
|
|
errorMsg += ` at index ${segment.start + pathDIndex} (should be removed)`;
|
|
reporter.error(errorMsg);
|
|
});
|
|
|
|
if (collinearSegments.length) {
|
|
if (updateIgnoreFile) {
|
|
ignoreIcon(reporter.name, iconPath, $);
|
|
}
|
|
}
|
|
},
|
|
function(reporter, $, ast) {
|
|
reporter.name = "extraneous";
|
|
|
|
if (!svgRegexp.test(ast.source)) {
|
|
reporter.error("Unexpected character(s), most likely extraneous whitespace, detected in SVG markup");
|
|
}
|
|
},
|
|
function(reporter, $, ast) {
|
|
reporter.name = "negative-zeros";
|
|
|
|
const iconPath = $.find("path").attr("d");
|
|
if (!updateIgnoreFile && isIgnored(reporter.name, iconPath)) {
|
|
return;
|
|
}
|
|
|
|
// Find negative zeros inside path
|
|
const negativeZeroMatches = Array.from(iconPath.matchAll(negativeZerosRegexp));
|
|
if (negativeZeroMatches.length) {
|
|
// Calculate the index for each match in the file
|
|
const svgFileContent = $.html();
|
|
const pathDIndex = getPathDIndex(svgFileContent);
|
|
|
|
negativeZeroMatches.forEach((match) => {
|
|
const negativeZeroFileIndex = match.index + pathDIndex;
|
|
const previousChar = svgFileContent[negativeZeroFileIndex - 1];
|
|
const replacement = "0123456789".includes(previousChar) ? " 0" : "0";
|
|
reporter.error(`Found "-0" at index ${negativeZeroFileIndex} (should be "${replacement}")`);
|
|
})
|
|
}
|
|
},
|
|
function(reporter, $, ast) {
|
|
reporter.name = "icon-centered";
|
|
|
|
const iconPath = $.find("path").attr("d");
|
|
if (!updateIgnoreFile && isIgnored(reporter.name, iconPath)) {
|
|
return;
|
|
}
|
|
|
|
const [minX, minY, maxX, maxY] = svgPathBbox(iconPath);
|
|
const targetCenter = iconSize / 2;
|
|
const centerX = +((minX + maxX) / 2).toFixed(iconFloatPrecision);
|
|
const devianceX = centerX - targetCenter;
|
|
const centerY = +((minY + maxY) / 2).toFixed(iconFloatPrecision);
|
|
const devianceY = centerY - targetCenter;
|
|
|
|
if (
|
|
Math.abs(devianceX) > iconTolerance ||
|
|
Math.abs(devianceY) > iconTolerance
|
|
) {
|
|
reporter.error(`<path> must be centered at (${targetCenter}, ${targetCenter}); the center is currently (${centerX}, ${centerY})`);
|
|
if (updateIgnoreFile) {
|
|
ignoreIcon(reporter.name, iconPath, $);
|
|
}
|
|
}
|
|
},
|
|
function(reporter, $, ast) {
|
|
reporter.name = "path-format";
|
|
|
|
const iconPath = $.find("path").attr("d");
|
|
|
|
const validPathFormatRegex = /^[Mm][MmZzLlHhVvCcSsQqTtAaEe0-9-,.\s]+$/;
|
|
if (!validPathFormatRegex.test(iconPath)) {
|
|
let errorMsg = "Invalid path format", reason;
|
|
|
|
if (!(/^[Mm]/.test(iconPath))) {
|
|
// doesn't start with moveto
|
|
reason = `should start with \"moveto\" command (\"M\" or \"m\"), but starts with \"${iconPath[0]}\"`;
|
|
reporter.error(`${errorMsg}: ${reason}`);
|
|
}
|
|
|
|
const validPathCharacters = "MmZzLlHhVvCcSsQqTtAaEe0123456789-,. ",
|
|
invalidCharactersMsgs = [],
|
|
pathDIndex = getPathDIndex($.html());
|
|
|
|
for (let [i, char] of Object.entries(iconPath)) {
|
|
if (validPathCharacters.indexOf(char) === -1) {
|
|
invalidCharactersMsgs.push(`"${char}" at index ${pathDIndex + parseInt(i)}`);
|
|
}
|
|
}
|
|
|
|
// contains invalid characters
|
|
if (invalidCharactersMsgs.length > 0) {
|
|
reason = `unexpected character${invalidCharactersMsgs.length > 1 ? 's' : ''} found`;
|
|
reason += ` (${invalidCharactersMsgs.join(", ")})`;
|
|
reporter.error(`${errorMsg}: ${reason}`);
|
|
}
|
|
}
|
|
},
|
|
function(reporter, $, ast) {
|
|
reporter.name = 'svg-format';
|
|
|
|
// Don't allow explicit '</path>' closing tag
|
|
if (ast.source.includes('</path>')) {
|
|
const reason = `found a closing "path" tag at index ${ast.source.indexOf('</path>')}.`
|
|
+ ' The path should be self-closing, use \'/>\' instead of \'></path>\'.';
|
|
reporter.error(`Invalid SVG content format: ${reason}`);
|
|
}
|
|
}
|
|
]
|
|
}
|
|
};
|