Assign the Unicode 1.1.5 Unified Han range

UnicodeData-1.1.5 lists only U+4E00 as `<CJK IDEOGRAPH REPRESENTATIVE>`,
so the gap logic reported 4E01..9FA5 as unassigned. The Unicode 1.1 Han
cross-reference table (CJKXREF.TXT) assigns the whole 4E00..9FA5 range,
so give the representative record that range.

Assisted-By: Claude Opus 5.5
Issue: #110

Author: JLHwung

scripts/parse-blocks-scripts-properties.mjs

@@ -182,6 +182,13 @@ const parseDerivedGeneralCategory = async (version) => {
 		let flag = false;
 		let first = 0;
 		let lastCodePoint = -1;
+		// Unicode 1.1.5 lists only U+4E00 as a representative of the Unified
+		// Han ideographs. The Unicode 1.1 Han cross-reference table assigns the
+		// whole 4E00..9FA5 range:
+		// https://www.unicode.org/Public/1.1-Update/CJKXREF.TXT
+		const representativeRangeEnds = new Map([
+			['<CJK IDEOGRAPH REPRESENTATIVE>', 0x9fa5],
+		]);
 		// http://unicode.org/reports/tr44/#GC_Values_Table
 		// http://unicode.org/reports/tr18/#Categories
 		for (const line of lines) {
@@ -192,6 +199,7 @@ const parseDerivedGeneralCategory = async (version) => {
 			const data = trimmed.split(';');
 			const codePoint = parseInt(data[0], 16);
 			const name = data[1];
+			const recordEnd = representativeRangeEnds.get(name) ?? codePoint;
 			const generalCategory = data[2];
 			const categories = [
 				categoryAliases.get(generalCategory),
@@ -230,11 +238,11 @@ const parseDerivedGeneralCategory = async (version) => {
 					first = codePoint;
 				} else {
 					for (const category of categories) {
-						categoryMap[category].add(codePoint);
+						categoryMap[category].addRange(codePoint, recordEnd);
 					}
 				}
 			}
-			lastCodePoint = codePoint;
+			lastCodePoint = recordEnd;
 		}
 
 		if (lastCodePoint < CODEPOINT_MAX) {

tests/parsers.mjs

@@ -12,6 +12,7 @@ import parseNameAliases from '../scripts/parse-name-aliases.mjs';
 import {
 	parseBlocks,
 	parseDerivedCoreProperties,
+	parseDerivedGeneralCategory,
 	parseDerivedNormalizationProperties,
 	parseProperties,
 	parseScripts,
@@ -151,6 +152,17 @@ test('Algorithmic ranges have individual formal names', async (t) => {
 	}
 });
 
+test('Unicode 1.1.5 assigns the Unified Han range represented by U+4E00', async (t) => {
+	const categories = await parseDerivedGeneralCategory('1.1.5');
+	for (const cp of [0x4e00, 0x4e01, 0x9fa5]) {
+		t.assert.ok(categories.Other_Letter.contains(cp), cp.toString(16));
+		t.assert.ok(categories.Assigned.contains(cp), cp.toString(16));
+		t.assert.ok(!categories.Unassigned.contains(cp), cp.toString(16));
+	}
+	t.assert.ok(categories.Unassigned.contains(0x9fa6));
+	t.assert.ok(!categories.Assigned.contains(0x9fa6));
+});
+
 test('Bidi class applies historical and current unassigned defaults', async (t) => {
 	for (const version of [
 		'3.0.0',