Nick SzaunigandClaude Opus 5.5
c18860c75c
- Veterinary medicine catalogue, lots and append-only movement ledger (rest always computed; corrections as counter-bookings; inactive medicines take no new stock; unit must match on lot moves). - Documents of medicine lots, authority notices and restrictions need the domain right on top of documents:* (403 before any lookup). - Label particulars: pure checkLabel with six mandatory gaps and four warnings, AFM font metrics, Berlin-day dates, geometric reading order for split addresses, new master-data fields with row-locked updates. - Herd events ColonyCreated, ColonyMoved, ApiaryChanged and TskReferenceDayReached (ids only, never forwarded to webhooks); CSV import emits ColonyCreated with audit. - ARCHITECTURE.md §12 Compliance (T6), Annahmen 59–70. Co-Authored-By: Claude Opus 5.5 (1M context) <[email protected]>
93 lines
2.8 KiB
TypeScript
93 lines
2.8 KiB
TypeScript
import PDFDocument from 'pdfkit';
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import { LabelFontFamily, LabelTextElement } from './label-element.types';
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export const MM_TO_PT = 72 / 25.4;
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/** Glyph metrics in AFM units (1/1000 of the font size). */
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export interface FontMetrics {
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xHeight: number;
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capHeight: number;
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}
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export interface TextMeasurer {
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/** Height in pt the element's text needs at the element's width and font. */
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heightOfStringPt(text: string, element: LabelTextElement): number;
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}
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/** The pdfkit standard font a family/style combination prints with. */
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export function pdfFontName(
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family: LabelFontFamily,
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bold: boolean,
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italic: boolean,
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): string {
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const base =
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family === 'serif' ? 'Times' : family === 'mono' ? 'Courier' : 'Helvetica';
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if (base === 'Times') {
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if (bold && italic) return 'Times-BoldItalic';
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if (bold) return 'Times-Bold';
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if (italic) return 'Times-Italic';
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return 'Times-Roman';
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}
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const suffix =
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bold && italic ? '-BoldOblique' : bold ? '-Bold' : italic ? '-Oblique' : '';
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return `${base}${suffix}`;
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}
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/** Height in mm of a glyph class: size in pt x metric / 1000 x 25.4 / 72. */
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export function heightMm(fontSizePt: number, metricPer1000: number): number {
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return ((fontSizePt * metricPer1000) / 1000) * (25.4 / 72);
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}
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// pdfkit keeps the loaded font in the private field `_font`; this is the one
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// place that reads it. font-metrics.spec.ts pins the values, so a pdfkit
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// update that moves or renames the field fails there and nowhere else.
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interface PdfDocumentInternals {
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_font?: { xHeight?: unknown; capHeight?: unknown };
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}
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const metricsCache = new Map<string, FontMetrics>();
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/** AFM x-height and cap height of a built-in PDF font. */
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export function fontMetricsOf(
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family: LabelFontFamily,
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bold: boolean,
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italic: boolean,
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): FontMetrics {
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const name = pdfFontName(family, bold, italic);
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const cached = metricsCache.get(name);
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if (cached) {
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return cached;
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}
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const doc = new PDFDocument({ size: 'A4', margin: 0 });
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doc.font(name);
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const font = (doc as unknown as PdfDocumentInternals)._font;
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const { xHeight, capHeight } = font ?? {};
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if (
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typeof xHeight !== 'number' ||
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typeof capHeight !== 'number' ||
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!(xHeight > 0) ||
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!(capHeight > 0)
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) {
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throw new Error(`No AFM metrics for font ${name}`);
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}
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const metrics = { xHeight, capHeight };
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metricsCache.set(name, metrics);
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return metrics;
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}
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/** Measures text with a throw-away PDF document; nothing is written out. */
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export function pdfTextMeasurer(): TextMeasurer {
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const doc = new PDFDocument({ size: 'A4', margin: 0 });
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return {
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heightOfStringPt(text, element) {
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if (text === '') {
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return 0;
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}
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return doc
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.font(pdfFontName(element.fontFamily, element.bold, element.italic))
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.fontSize(element.fontSize)
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.heightOfString(text, { width: element.width * MM_TO_PT });
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},
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};
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}
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