import { blob } from "https://esm.town/v/std/blob"; import { icons, IconStyle } from "npm:@phosphor-icons/core"; import { Font, FontEditor, woff2 } from "npm:fonteditor-core"; const CDN_BASE_URL = "https://unpkg.com/@phosphor-icons"; type SemVer = `${number}.${number}.${number}`; type IconStyleMap = Partial>; type FontFormatMap = Partial>; type SerialFontFormatMap = Partial>; type FontPack = { fonts: FontFormatMap; css: string; }; type SerialFontPack = { fonts: SerialFontFormatMap; css: string; }; type IcoMoonSelection = { IcoMoonType: "selection"; icons: { icon: { paths: string[]; attrs: Record[]; isMulticolor: boolean; isMulticolor2: boolean; grid: number; tags: string[]; }; attrs: Record[]; properties: { order: number; id: number; name: string; prevSize: number; code: number; codes?: number[]; ligatures: string; }; setIdx: number; setId: number; iconIdx: number; }[]; }; const CACHE = new (class { constructor() {} private packageVersion(version: SemVer): string { return !!version ? `web@${version}` : "web"; } private fontName(weight: IconStyle): string { return weight === "regular" ? "Phosphor" : `Phosphor-${weight.replace(/^\w/, (c) => c.toUpperCase())}`; } private fontURL(weight: IconStyle, version: SemVer): string { return `${CDN_BASE_URL}/${ this.packageVersion( version, ) }/src/${weight}/${this.fontName(weight)}.ttf`; } private cssURL(weight: IconStyle, version: SemVer): string { return `${CDN_BASE_URL}/${ this.packageVersion( version, ) }/src/${weight}/style.css`; } private selectionURL(weight: IconStyle, version: SemVer) { return `${CDN_BASE_URL}/${ this.packageVersion( version, ) }/src/${weight}/selection.json`; } async getSelection(weight: IconStyle, version: SemVer = "2.1.1"): Promise { let selection = await blob.getJSON(`ph-${version}-selection-${weight}`); if (!selection) { const res = await fetch(this.selectionURL(weight, version), { method: "GET", mode: "cors", cache: "default", }); if (res.status !== 200) { throw new Error(res.statusText); } selection = (await res.json()) as IcoMoonSelection; await blob.setJSON(`ph-${version}-selection-${weight}`, selection); } return selection; } async getFont(weight: IconStyle, version: SemVer = "2.1.1"): Promise { let buffer; try { const b = await blob.get(`ph-${version}-font-${weight}`); buffer = await b.arrayBuffer(); } catch (_) {} if (!buffer) { const res = await fetch(this.fontURL(weight, version), { method: "GET", mode: "cors", cache: "default", }); if (res.status !== 200) { throw new Error(res.statusText); } buffer = await res.arrayBuffer(); await blob.set(`ph-${version}-font-${weight}`, buffer); } return buffer; } async getCSS(weight: IconStyle, version: SemVer = "2.1.1"): Promise { let css; try { const b = await blob.get(`ph-${version}-css-${weight}`); css = await b.arrayBuffer(); } catch (_) {} if (!css) { const res = await fetch(this.cssURL(weight, version), { method: "GET", mode: "cors", cache: "default", }); if (res.status !== 200) { throw new Error(res.statusText); } css = await res.arrayBuffer(); await blob.set(`ph-${version}-css-${weight}`, css); } return css; } async getAssetSize(weight: IconStyle, version: SemVer = "2.1.1") { const font = (await this.getFont(weight, version)).byteLength; const css = (await this.getCSS(weight, version)).byteLength; return { font, css }; } })(); class FontSubset { private names: Set; weight: IconStyle; version?: SemVer; codes: Map = new Map(); font: FontEditor.Font = Font.create(); constructor(weight: IconStyle, names: string[], version?: SemVer) { this.weight = weight; this.version = version; this.names = new Set(names.filter(Boolean)); } fontName(): string { return this.weight === "regular" ? "Phosphor" : `Phosphor-${this.weight.replace(/^\w/, (c) => c.toUpperCase())}`; } glyphName(iconName: string): string { if (this.weight === "regular") return iconName; return `${iconName}-${this.weight}`; } prefixClass(): string { return this.weight === "regular" ? ".ph" : `.ph-${this.weight}`; } private generateIconCSS(name: string) { const codes = this.codes.get(name); if (!codes) { throw new Error(`Could not find code points for "${name}"`); } if (codes.length > 2 || codes.length === 0) { throw new Error(`Invalid number of code points for ${name}: ${codes}`); } if (this.weight === "duotone") { if (codes.length === 2) { return `\ .ph-duotone.ph-${name}:before { content: "\\${codes[0].toString(16)}"; opacity: 0.2; } .ph-duotone.ph-${name}:after { content: "\\${codes[1].toString(16)}"; margin-left: -1em; }`; } else { return `\ .ph-duotone.ph-${name}:before { content: "\\${codes[0].toString(16)}"; }`; } } else { if (codes.length !== 1) { throw new Error(`Invalid number of code points: ${codes}`); } return `\ ${this.prefixClass()}.ph-${name}:before { content: "\\${codes[0].toString(16)}"; }`; } } async initialize() { const selection = await CACHE.getSelection(this.weight, this.version); for (const name of Array.from(this.names)) { let matchName = this.glyphName(name); let entry = selection.icons.find( (entry) => entry.properties.name.split(", ").includes(matchName), ); if (!entry) { const iconEntry = icons.find((e) => (e as any).alias?.name === name); if (iconEntry) { matchName = this.glyphName((iconEntry as any).alias.name); entry = selection.icons.find( (entry) => entry.properties.name.split(", ").includes(matchName), ); break; } throw new Error(`Selection match not found for "${matchName}" ("${name}")`); } this.codes.set(name, entry.properties.codes ?? [entry.properties.code]); } } async prepareFont() { await this.initialize(); const buffer = await CACHE.getFont(this.weight, this.version); const codePoints = Array.from(this.codes.values()).flat(); this.font = Font.create(buffer, { type: "ttf", subset: codePoints, hinting: false, compound2simple: true, }); } generateIconsCSS(): string[] { return Array.from(this.codes.keys()).map((name) => this.generateIconCSS(name)); } } class FontPacker { private subsets: FontSubset[]; constructor(icons: IconStyleMap, version?: SemVer) { this.subsets = Object.entries(icons) .filter(([_, names]) => !!names.length) .map( ([weight, names]) => new FontSubset(weight as IconStyle, names, version), ); } private prefixClasses() { return this.subsets.map((subset) => subset.prefixClass()).join(", "); } private generatePrefixClassDefinition( fonts: FontFormatMap, buffer?: ArrayBuffer | null, ) { const fmts: [extension: string, format: string][] = Object.keys(fonts).map( (fmt) => fmt === "ttf" ? [fmt, "truetype"] : fmt === "otf" ? [fmt, "opentype"] : fmt === "eot" ? [fmt, "embedded-opentype"] : [fmt, fmt], ); const source = buffer // TODO: use a preferred format?? ? `url(data:font/${fmts[0][1]};charset=utf-8;base64,${ Font.toBase64( buffer, ) })` : fmts .map( ([extension, format]) => `url("/Phosphor.${extension}${format === "svg" ? `#Phosphor` : ""}") format("${format}")`, ) .join(", "); return `\ @font-face { font-family: "Phosphor"; src: ${source}; font-weight: normal; font-style: normal; font-display: block; } ${this.prefixClasses()} { /* use !important to prevent issues with browser extensions that change fonts */ font-family: "Phosphor" !important; speak: never; font-style: normal; font-weight: normal; font-variant: normal; text-transform: none; line-height: 1; /* Better Font Rendering =========== */ -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; } `; } private mergeCSS(fonts: FontFormatMap, buffer: ArrayBuffer | null) { const classes = this.subsets .map((subset) => subset.generateIconsCSS()) .flat() .join("\n"); return `\ ${this.generatePrefixClassDefinition(fonts, buffer)} ${classes} `; } private remapCodePointsIfNeeded() { const PUA_START = 0xe000; const PUA_END = 0xf8ff; const SPUA_A_START = 0xf0000; const usedCodes = new Set(); let next = PUA_START; function nextAvailableCodePoint() { while (usedCodes.has(next)) { next += 1; if (next === PUA_END + 1) { next = SPUA_A_START; } } return next; } for (const subset of this.subsets) { for (const [key, codes] of subset.codes) { const [glyph, other] = subset.font.find({ unicode: codes }); if (!glyph) { console.log(key, subset.glyphName(key), codes); throw new Error( `Glyph for code point 0x${codes[0]}${codes[1] ? `0x${codes[1]}` : ""} (${subset.glyphName(key)}) not found`, ); } glyph.name = key; if (other) { other.name = `${key}_layer`; } const newCodes = codes.map((codePoint, i) => { if (usedCodes.has(codePoint)) { const newCodePoint = nextAvailableCodePoint(); // Reassign in cmap const cmap = subset.font.get().cmap; const idx = cmap[codePoint]; if (subset.weight === IconStyle.DUOTONE) { console.log({ codePoint, idx, codes }); } delete cmap[codePoint]; cmap[newCodePoint] = idx; // Reassign in local map codes[i] = newCodePoint; usedCodes.add(newCodePoint); return newCodePoint; } else { usedCodes.add(codePoint); return codePoint; } }); // Reassign glyph code point glyph.unicode = [newCodes[0]]; if (other) { other.unicode = [newCodes[1]]; } } } } async generate( formats: FontEditor.FontType[] = ["woff", "ttf", "svg"], inline?: boolean, ): Promise { let woff2editor: FontEditor.Woff2; if (formats.includes("woff2") && !woff2.isInited) { woff2editor = await woff2.init(); } await Promise.all(this.subsets.map((subset) => subset.prepareFont())); this.remapCodePointsIfNeeded(); let mergedFont: FontEditor.Font; if (this.subsets.length === 1) { mergedFont = this.subsets[0].font; } else if (this.subsets.length > 1) { mergedFont = this.subsets[0].font; for (let i = 1; i < this.subsets.length; i++) { mergedFont = mergedFont.merge(this.subsets[i].font, { scale: 1 }); } } else { throw new Error("Font must contain at least 1 glyph!"); } const fonts = formats.reduce((acc, format) => { if (format === "woff2") { acc[format] = woff2editor.encode( mergedFont.write({ type: "ttf", hinting: false, writeZeroContoursGlyfData: true, metadata: "", /*TODO*/ toBuffer: true, }), ); } else { try { acc[format] = mergedFont.write({ type: format, hinting: false, writeZeroContoursGlyfData: true, metadata: "", /*TODO*/ toBuffer: true, }); } catch (e) { console.error(e); throw e; } } return acc; }, {}); // TODO: preferred font! const css = this.mergeCSS(fonts, inline ? fonts[formats[0]]! : null); return { fonts, css }; } } type FontRequest = { icons: Partial>; version?: SemVer; formats?: FontEditor.FontType[]; inline?: boolean; }; function bufferToBase64(buffer: ArrayBuffer) { let binary = ""; const bytes = new Uint8Array(buffer); const len = bytes.byteLength; for (let i = 0; i < len; i++) { binary += String.fromCharCode(bytes[i]); } return btoa(binary); } export default async function( req: Request, ): Promise { if (req.method !== "POST") { return Response.json({ error: "This val responds to POST requests." }, { status: 400, }); } const data = await req.json() as FontRequest; const packer = new FontPacker(data.icons, data.version); try { const pack = await packer.generate(data.formats, data.inline); return Response.json({ ...pack, fonts: Object.entries(pack.fonts).reduce( (acc, [fmt, buff]) => { acc[fmt as FontEditor.FontType] = bufferToBase64(buff); return acc; }, {}, ), }); } catch (error) { console.error(error); if (error instanceof Error) { return Response.json({ error: error.message }); } else if (typeof error === "string") { return Response.json({ error }); } else { return Response.json({ error: "Unknown server error" }); } } }

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