Initial work of ESM transformation

utility/export-data/coverage-export/gather-coverage-data.mjs

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+import { BlockData } from "./block-data.mjs";
+import ucdNames from "@unicode/unicode-14.0.0/Names";
+import ugc from "@unicode/unicode-14.0.0/General_Category";
+function findFirstLastChar(lchBlockStart, lchBlockEnd, cov) {
+	let lchFirst = 0,
+		lchLast = 0;
+	for (const [lchFont] of cov) {
+		if (lchFont < 0x20 || lchFont < lchBlockStart || lchFont > lchBlockEnd) continue;
+		if (!lchFirst || lchFont < lchFirst) lchFirst = lchFont;
+		if (!lchLast || lchFont > lchLast) lchLast = lchFont;
+	}
+	if (!lchFirst || !lchLast) return [0, 0];
+	if (lchBlockEnd - lchBlockStart <= 0x100 && lchBlockStart > 0xff) {
+		lchFirst = lchBlockStart;
+		lchLast = lchBlockEnd;
+	}
+	const lchStart = (lchFirst >>> 4) << 4;
+	const lchEnd = ((lchLast >>> 4) << 4) + 0x10;
+	return [lchStart, lchEnd];
+}
+export const gatherCoverageData = function (covUpright, covItalic, covOblique) {
+	const result = [];
+	for (const [[lchBlockStart, lchBlockEnd], block] of BlockData) {
+		let blockResults = [];
+		const [lchStart, lchEnd] = findFirstLastChar(lchBlockStart, lchBlockEnd, covUpright);
+		if (!lchStart || !lchEnd) continue;
+		for (let lch = lchStart; lch < lchEnd; lch++) {
+			const chName = ucdNames.get(lch);
+			const gc = ugc.get(lch);
+			const cdUpright = covUpright.get(lch);
+			const cdItalic = covItalic.get(lch);
+			const cdOblique = covOblique.get(lch);
+			if (cdUpright && cdItalic && cdOblique) {
+				const [glyphName, typographicVariants, charVariantsUpright] = cdUpright;
+				const [, , charVariantsItalic] = cdItalic;
+				const [, , charVariantsOblique] = cdOblique;
+				blockResults.push({
+					lch,
+					gc,
+					charName: chName,
+					inFont: true,
+					glyphName: glyphName,
+					typographicVariants: typographicVariants,
+					charVariantsUpright,
+					charVariantsItalic,
+					charVariantsOblique
+				});
+			} else {
+				blockResults.push({
+					lch,
+					gc,
+					charName: chName,
+					inFont: false,
+					glyphName: undefined
+				});
+			}
+		}
+		if (blockResults.length) {
+			result.push({
+				name: block,
+				characters: blockResults.sort((a, b) => a.lch - b.lch)
+			});
+		}
+	}
+	return result;
+};