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const { ucs2 } = require('punycode'); const { Transform } = require('stream'); const Sax = require('sax'); const { SVGPathData } = require('svg-pathdata'); const svgShapesToPath = require('./svgshapes2svgpath'); const { Matrix } = require('./Matrix'); require('string.prototype.codepointat'); // Transform helpers (will move elsewhere later) function parseTransforms(value) { return value .match(/(rotate|translate|scale|skewX|skewY|matrix)\s*\(([^)]*)\)\s*/g) .map((transform) => transform.match(/[\w.-]+/g)); } function matrixFromTransformAttribute(transformAttributeString) { const transformations = { matrix: (result, ...args) => result.transform(...args), translate: (result, x, y = 0) => result.translate(x, y), scale: (result, x, y = x) => result.scale(x, y), rotate: (result, a, x = 0, y = 0) => { if (0 === x && 0 === y) { result.rotateDeg(a); } else { result.translate(x, y).rotateDeg(a).translate(-x, -y); } }, skewX: (result, a) => result.skewX((a * Math.PI) / 180), skewY: (result, a) => result.skewY((a * Math.PI) / 180), }; const result = new Matrix(); for (const transform of parseTransforms(transformAttributeString)) { transformations[transform[0]]( result, ...transform.slice(1).map(parseFloat) ); } return result; } // Rendering function tagShouldRender(curTag, parents) { let values; return !parents.some((tag) => { if ( 'undefined' !== typeof tag.attributes.display && 'none' === tag.attributes.display.toLowerCase() ) { return true; } if ( 'undefined' !== typeof tag.attributes.width && 0 === parseFloat(tag.attributes.width) ) { return true; } if ( 'undefined' !== typeof tag.attributes.height && 0 === parseFloat(tag.attributes.height) ) { return true; } if ('undefined' !== typeof tag.attributes.viewBox) { values = tag.attributes.viewBox.split(/\s*,*\s|\s,*\s*|,/); if (0 === parseFloat(values[2]) || 0 === parseFloat(values[3])) { return true; } } return false; }); } // According to the document (http://www.w3.org/TR/SVG/painting.html#FillProperties) // fill <paint> none|currentColor|inherit|<color> // [<icccolor>]|<funciri> (not support yet) function getTagColor(currTag, parents) { const defaultColor = 'black'; const fillVal = currTag.attributes.fill; let color; const parentsLength = parents.length; if ('none' === fillVal) { return color; } if ('currentColor' === fillVal) { return defaultColor; } if ('inherit' === fillVal) { if (0 === parentsLength) { return defaultColor; } return getTagColor( parents[parentsLength - 1], parents.slice(0, parentsLength - 1) ); // this might be null. // For example: <svg ><path fill="inherit" /> </svg> // in this case getTagColor should return null // recursive call, the bottom element should be svg, // and svg didn't fill color, so just return null } return fillVal; } class SVGIcons2SVGFontStream extends Transform { constructor(options) { super({ objectMode: true }); // Setting objectMode separately this._writableState.objectMode = true; this._readableState.objectMode = false; this.glyphs = []; this._options = options || {}; this._options.fontName = this._options.fontName || 'iconfont'; this._options.fontId = this._options.fontId || this._options.fontName; this._options.fixedWidth = this._options.fixedWidth || false; this._options.descent = this._options.descent || 0; this._options.round = this._options.round || 10e12; this._options.metadata = this._options.metadata || ''; this.log = this._options.log || console.log.bind(console); // eslint-disable-line } _transform(svgIconStream, _unused, svgIconStreamCallback) { // Parsing each icons asynchronously const saxStream = Sax.createStream(true); const parents = []; const transformStack = [new Matrix()]; function applyTransform(d) { return new SVGPathData(d).matrix( ...transformStack[transformStack.length - 1].toArray() ); } const glyph = svgIconStream.metadata || {}; // init width and height os they aren't undefined if <svg> isn't renderable glyph.width = 0; glyph.height = 1; glyph.paths = []; this.glyphs.push(glyph); if ('string' !== typeof glyph.name) { this.emit( 'error', new Error( `Please provide a name for the glyph at index ${ this.glyphs.length - 1 }` ) ); } if ( this.glyphs.some( (anotherGlyph) => anotherGlyph !== glyph && anotherGlyph.name === glyph.name ) ) { this.emit( 'error', new Error(`The glyph name "${glyph.name}" must be unique.`) ); } if ( glyph.unicode && glyph.unicode instanceof Array && glyph.unicode.length ) { if ( glyph.unicode.some((unicodeA, i) => glyph.unicode.some((unicodeB, j) => i !== j && unicodeA === unicodeB) ) ) { this.emit( 'error', new Error( `Given codepoints for the glyph "${glyph.name}" contain duplicates.` ) ); } } else if ('string' !== typeof glyph.unicode) { this.emit( 'error', new Error(`Please provide a codepoint for the glyph "${glyph.name}"`) ); } if ( this.glyphs.some( (anotherGlyph) => anotherGlyph !== glyph && anotherGlyph.unicode === glyph.unicode ) ) { this.emit( 'error', new Error( `The glyph "${glyph.name}" codepoint seems to be used already elsewhere.` ) ); } saxStream.on('opentag', (tag) => { let values; let color; parents.push(tag); try { const currentTransform = transformStack[transformStack.length - 1]; if ('undefined' !== typeof tag.attributes.transform) { const transform = matrixFromTransformAttribute( tag.attributes.transform ); transformStack.push(currentTransform.clone().multiply(transform)); } else { transformStack.push(currentTransform); } // Checking if any parent rendering is disabled and exit if so if (!tagShouldRender(tag, parents)) { return; } // Save the view size if ('svg' === tag.name) { if ('viewBox' in tag.attributes) { values = tag.attributes.viewBox.split(/\s*,*\s|\s,*\s*|,/); const dX = parseFloat(values[0]); const dY = parseFloat(values[1]); const width = parseFloat(values[2]); const height = parseFloat(values[3]); // use the viewBox width/height if not specified explictly glyph.width = 'width' in tag.attributes ? parseFloat(tag.attributes.width) : width; glyph.height = 'height' in tag.attributes ? parseFloat(tag.attributes.height) : height; transformStack[transformStack.length - 1] .translate(-dX, -dY) .scale(glyph.width / width, glyph.height / height); } else { if ('width' in tag.attributes) { glyph.width = parseFloat(tag.attributes.width); } else { this.log( `Glyph "${glyph.name}" has no width attribute, defaulting to 150.` ); glyph.width = 150; } if ('height' in tag.attributes) { glyph.height = parseFloat(tag.attributes.height); } else { this.log( `Glyph "${glyph.name}" has no height attribute, defaulting to 150.` ); glyph.height = 150; } } } else if ('clipPath' === tag.name) { // Clipping path unsupported this.log( `Found a clipPath element in the icon "${glyph.name}" the result may be different than expected.` ); } else if ('rect' === tag.name && 'none' !== tag.attributes.fill) { glyph.paths.push( applyTransform(svgShapesToPath.rectToPath(tag.attributes)) ); } else if ('line' === tag.name && 'none' !== tag.attributes.fill) { this.log( `Found a line element in the icon "${glyph.name}" the result could be different than expected.` ); glyph.paths.push( applyTransform(svgShapesToPath.lineToPath(tag.attributes)) ); } else if ('polyline' === tag.name && 'none' !== tag.attributes.fill) { this.log( `Found a polyline element in the icon "${glyph.name}" the result could be different than expected.` ); glyph.paths.push( applyTransform(svgShapesToPath.polylineToPath(tag.attributes)) ); } else if ('polygon' === tag.name && 'none' !== tag.attributes.fill) { glyph.paths.push( applyTransform(svgShapesToPath.polygonToPath(tag.attributes)) ); } else if ( ['circle', 'ellipse'].includes(tag.name) && 'none' !== tag.attributes.fill ) { glyph.paths.push( applyTransform(svgShapesToPath.circleToPath(tag.attributes)) ); } else if ( 'path' === tag.name && tag.attributes.d && 'none' !== tag.attributes.fill ) { glyph.paths.push(applyTransform(tag.attributes.d)); } // According to http://www.w3.org/TR/SVG/painting.html#SpecifyingPaint // Map attribute fill to color property if ('none' !== tag.attributes.fill) { color = getTagColor(tag, parents); if ('undefined' !== typeof color) { glyph.color = color; } } } catch (err) { this.emit( 'error', new Error( `Got an error parsing the glyph "${glyph.name}": ${err.message}.` ) ); } }); saxStream.on('error', (err) => { this.emit('error', err); }); saxStream.on('closetag', () => { transformStack.pop(); parents.pop(); }); saxStream.on('end', () => { svgIconStreamCallback(); }); svgIconStream.pipe(saxStream); } _flush(svgFontFlushCallback) { const maxGlyphHeight = this.glyphs.reduce( (curMax, glyph) => Math.max(curMax, glyph.height), 0 ); const maxGlyphWidth = this.glyphs.reduce( (curMax, glyph) => Math.max(curMax, glyph.width), 0 ); const fontHeight = this._options.fontHeight || maxGlyphHeight; let fontWidth = maxGlyphWidth; if (this._options.normalize) { fontWidth = this.glyphs.reduce( (curMax, glyph) => Math.max(curMax, (fontHeight / glyph.height) * glyph.width), 0 ); } else if (this._options.fontHeight) { // even if normalize is off, we need to scale the fontWidth if we have a custom fontHeight fontWidth *= fontHeight / maxGlyphHeight; } this._options.ascent = 'undefined' !== typeof this._options.ascent ? this._options.ascent : fontHeight - this._options.descent; if ( !this._options.normalize && fontHeight > (1 < this.glyphs.length ? this.glyphs.reduce( (curMin, glyph) => Math.min(curMin, glyph.height), Infinity ) : this.glyphs[0].height) ) { this.log( 'The provided icons do not have the same heights. This could lead' + ' to unexpected results. Using the normalize option may help.' ); } if (1000 > fontHeight) { this.log( 'A fontHeight of at least than 1000 is recommended, otherwise ' + 'further steps (rounding in svg2ttf) could lead to ugly results.' + ' Use the fontHeight option to scale icons.' ); } // Output the SVG file // (find a SAX parser that allows modifying SVG on the fly) /* eslint-disable prefer-template */ this.push( '<?xml version="1.0" standalone="no"?>\n' + '<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd" >\n' + '<svg xmlns="http://www.w3.org/2000/svg">\n' + (this._options.metadata ? '<metadata>' + this._options.metadata + '</metadata>\n' : '') + '<defs>\n' + ' <font id="' + this._options.fontId + '" horiz-adv-x="' + fontWidth + '">\n' + ' <font-face font-family="' + this._options.fontName + '"\n' + ' units-per-em="' + fontHeight + '" ascent="' + this._options.ascent + '"\n' + ' descent="' + this._options.descent + '"' + (this._options.fontWeight ? '\n font-weight="' + this._options.fontWeight + '"' : '') + (this._options.fontStyle ? '\n font-style="' + this._options.fontStyle + '"' : '') + ' />\n' + ' <missing-glyph horiz-adv-x="0" />\n' ); this.glyphs.forEach((glyph) => { const ratio = this._options.normalize ? fontHeight / glyph.height : fontHeight / maxGlyphHeight; if (!isFinite(ratio)) throw new Error('foo'); glyph.width *= ratio; glyph.height *= ratio; const glyphPath = new SVGPathData(''); if (this._options.fixedWidth) { glyph.width = fontWidth; } const yOffset = glyph.height - this._options.descent; const glyphPathTransform = new Matrix().transform( 1, 0, 0, -1, 0, yOffset ); // ySymmetry if (1 !== ratio) { glyphPathTransform.scale(ratio, ratio); } glyph.paths.forEach((path) => { glyphPath.commands.push( ...path.toAbs().matrix(...glyphPathTransform.toArray()).commands ); }); const bounds = (this._options.centerHorizontally || this._options.centerVertically) && glyphPath.getBounds(); if (this._options.centerHorizontally) { glyphPath.translate( (glyph.width - (bounds.maxX - bounds.minX)) / 2 - bounds.minX ); } if (this._options.centerVertically) { glyphPath.translate( 0, (fontHeight - (bounds.maxY - bounds.minY)) / 2 - bounds.minY ); } delete glyph.paths; glyph.unicode.forEach((unicode, i) => { const unicodeStr = ucs2 .decode(unicode) .map((point) => '&#x' + point.toString(16).toUpperCase() + ';') .join(''); const d = glyphPath.round(this._options.round).encode(); this.push( ' <glyph glyph-name="' + glyph.name + (0 === i ? '' : '-' + i) + '"\n' + ' unicode="' + unicodeStr + '"\n' + ' horiz-adv-x="' + glyph.width + '" d="' + d + '" />\n' ); }); }); this.push(' </font>\n' + '</defs>\n' + '</svg>\n'); this.log('Font created'); if ('function' === typeof this._options.callback) { this._options.callback(this.glyphs); } svgFontFlushCallback(); } } module.exports = SVGIcons2SVGFontStream; |