xavierk
92ba3d9590
Static TTF fonts (IBM Plex Sans/Mono, Noto Devanagari/Kannada) with a fontkit-generated manifest, a verifier and OFL licences. Every family registers a normal and italic source so fallback stacks cannot throw. Adds A4/Letter geometry with margin presets, an exact column allocator, deterministic Indian-grouping money and date formatting, text sanitising and a pure buildRenderModel.
80 lines
3.0 KiB
JavaScript
80 lines
3.0 KiB
JavaScript
// Shared helpers for the font manifest builder and verifier (Node only).
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import { createHash } from "node:crypto";
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import { readdirSync, readFileSync, statSync } from "node:fs";
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import path from "node:path";
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import { fileURLToPath } from "node:url";
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import * as fontkit from "fontkit";
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export const ROOT = path.resolve(path.dirname(fileURLToPath(import.meta.url)), "../..");
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export const FONTS_DIR = path.join(ROOT, "public/fonts");
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export const MANIFEST_PATH = path.join(FONTS_DIR, "manifest.json");
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export const sha256 = (bytes) => createHash("sha256").update(bytes).digest("hex");
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/** Folders under public/fonts that hold bundled families (everything that is a directory). */
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export function familyFolders() {
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return readdirSync(FONTS_DIR)
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.filter((name) => statSync(path.join(FONTS_DIR, name)).isDirectory())
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.sort();
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}
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export function ttfFiles(folder) {
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return readdirSync(path.join(FONTS_DIR, folder))
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.filter((name) => /\.ttf$/i.test(name))
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.sort();
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}
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/** First four bytes as a tag: "\0\1\0\0" is reported as "0x00010000". */
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export function sfntTag(bytes) {
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const b = bytes.subarray(0, 4);
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if (b[0] === 0 && b[1] === 1 && b[2] === 0 && b[3] === 0) return "0x00010000";
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return String.fromCharCode(...b);
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}
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/** Raw OS/2 fsType (fontkit only exposes decoded flags). */
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function rawFsType(bytes) {
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const dv = new DataView(bytes.buffer, bytes.byteOffset, bytes.byteLength);
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const numTables = dv.getUint16(4);
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for (let i = 0; i < numTables; i++) {
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const rec = 12 + i * 16;
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const tag = String.fromCharCode(bytes[rec], bytes[rec + 1], bytes[rec + 2], bytes[rec + 3]);
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if (tag === "OS/2") return dv.getUint16(dv.getUint32(rec + 8) + 8);
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}
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return null;
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}
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/** Reads a TTF with fontkit and returns the facts the manifest records. */
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export function inspectFont(folder, file) {
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const bytes = new Uint8Array(readFileSync(path.join(FONTS_DIR, folder, file)));
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const font = fontkit.create(Buffer.from(bytes));
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if (font.fonts) throw new Error(`${folder}/${file}: font collections are not supported`);
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const os2 = font["OS/2"];
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return {
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bytes,
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tag: sfntTag(bytes),
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variable: Boolean(font.directory?.tables?.fvar),
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// Name ID 16 (typographic family) groups SemiBold etc. under the base family.
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familyName: font.name?.records?.preferredFamily?.en ?? font.familyName,
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info: {
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file,
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weight: os2.usWeightClass,
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style: os2.fsSelection.italic || os2.fsSelection.oblique ? "italic" : "normal",
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sha256: sha256(bytes),
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fsType: rawFsType(bytes),
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upm: font.unitsPerEm,
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ascent: font.ascent,
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descent: font.descent,
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lineGap: font.lineGap,
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capHeight: font.capHeight,
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xHeight: font.xHeight,
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hasRupee: font.hasGlyphForCodePoint(0x20b9),
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hasTabularNums: font.availableFeatures.includes("tnum"),
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},
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};
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}
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export const WEIGHT_WORDS = {
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Thin: 100, ExtraLight: 200, Light: 300, Regular: 400, Italic: 400, Text: 450,
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Medium: 500, SemiBold: 600, Bold: 700, ExtraBold: 800, Black: 900,
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};
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