perf improvements and test coverage

.changeset/rare-beans-reflect.md

@@ -0,0 +1,5 @@
+---
+'@careswitch/svelte-data-table': patch
+---
+
+perf: filter matching, sort handling null/undefined, non-capturing group for global filter regex

src/index.test.ts

@@ -150,6 +150,45 @@ describe('DataTable', () => {
 			const ageGroupSortState = table.getSortState('ageGroup');
 			expect(ageSortState).not.toBe(ageGroupSortState);
 		});
+
+		it('should handle sorting with custom getValue returning undefined', () => {
+			const customColumns: ColumnDef<any>[] = [
+				{
+					id: 'customSort',
+					key: 'value',
+					name: 'Custom Sort',
+					sortable: true,
+					getValue: (row) => (row.value === 3 ? undefined : row.value)
+				}
+			];
+			const customData = [
+				{ id: 1, value: 3 },
+				{ id: 2, value: 1 },
+				{ id: 3, value: 2 }
+			];
+			const table = new DataTable({ data: customData, columns: customColumns });
+			table.toggleSort('customSort');
+			expect(table.rows[0].value).toBe(1);
+			expect(table.rows[1].value).toBe(2);
+			expect(table.rows[2].value).toBe(3);
+		});
+
+		it('should maintain sort stability for equal elements', () => {
+			const data = [
+				{ id: 1, value: 'A', order: 1 },
+				{ id: 2, value: 'B', order: 2 },
+				{ id: 3, value: 'A', order: 3 },
+				{ id: 4, value: 'C', order: 4 },
+				{ id: 5, value: 'B', order: 5 }
+			];
+			const columns: ColumnDef<(typeof data)[0]>[] = [
+				{ id: 'value', key: 'value', name: 'Value', sortable: true },
+				{ id: 'order', key: 'order', name: 'Order', sortable: true }
+			];
+			const table = new DataTable({ data, columns });
+			table.toggleSort('value');
+			expect(table.rows.map((r) => r.id)).toEqual([1, 3, 2, 5, 4]);
+		});
 	});
 
 	describe('Enhanced Sorting', () => {
@@ -332,6 +371,48 @@ describe('DataTable', () => {
 			table.setFilter('ageGroup', ['Young']);
 			expect(table.rows).toHaveLength(0); // No rows match both filters
 		});
+
+		it('should handle filtering with complex custom filter function', () => {
+			const customColumns: ColumnDef<any>[] = [
+				{
+					id: 'complexFilter',
+					key: 'value',
+					name: 'Complex Filter',
+					filter: (value, filterValue, row) => {
+						return value > filterValue && row.id % 2 === 0;
+					}
+				}
+			];
+			const customData = [
+				{ id: 1, value: 10 },
+				{ id: 2, value: 20 },
+				{ id: 3, value: 30 },
+				{ id: 4, value: 40 }
+			];
+			const table = new DataTable({ data: customData, columns: customColumns });
+			table.setFilter('complexFilter', [15]);
+			expect(table.rows).toHaveLength(2);
+			expect(table.rows[0].id).toBe(2);
+			expect(table.rows[1].id).toBe(4);
+		});
+
+		it('should handle filtering with extremely long filter lists', () => {
+			const longFilterList = Array.from({ length: 10000 }, (_, i) => i);
+			const table = new DataTable({ data: sampleData, columns });
+			table.setFilter('age', longFilterList);
+			expect(table.rows).toHaveLength(5); // All rows should match
+		});
+
+		it('should handle global filter with special regex characters', () => {
+			const data = [
+				{ id: 1, name: 'Alice (Manager)' },
+				{ id: 2, name: 'Bob [Developer]' }
+			] as any;
+			const table = new DataTable({ data, columns });
+			table.globalFilter = '(Manager)';
+			expect(table.rows).toHaveLength(1);
+			expect(table.rows[0].name).toBe('Alice (Manager)');
+		});
 	});
 
 	describe('Pagination', () => {
@@ -375,6 +456,21 @@ describe('DataTable', () => {
 			expect(table.rows).toHaveLength(5);
 			expect(table.totalPages).toBe(1);
 		});
+
+		it('should handle setting page size to 0', () => {
+			const table = new DataTable({ data: sampleData, columns, pageSize: 0 });
+			expect(table.rows).toHaveLength(5); // Should default to showing all rows
+		});
+
+		it('should handle navigation near total page count', () => {
+			const table = new DataTable({ data: sampleData, columns, pageSize: 2 });
+			table.currentPage = 3;
+			expect(table.canGoForward).toBe(false);
+			expect(table.canGoBack).toBe(true);
+			table.currentPage = 2;
+			expect(table.canGoForward).toBe(true);
+			expect(table.canGoBack).toBe(true);
+		});
 	});
 
 	describe('baseRows', () => {

src/lib/DataTable.svelte.ts

@@ -28,18 +28,19 @@ type TableConfig<T> = {
  * @template T The type of data items in the table.
  */
 export class DataTable<T> {
+	#columns: ColumnDef<T>[];
+	#pageSize: number;
+
 	#originalData = $state<T[]>([]);
-	#columns = $state<ColumnDef<T>[]>([]);
-	#pageSize = $state(10);
 	#currentPage = $state(1);
 	#sortState = $state<{ columnId: string | null; direction: SortDirection }>({
 		columnId: null,
 		direction: null
 	});
 	#filterState = $state<{ [id: string]: Set<any> }>({});
 	#globalFilter = $state<string>('');
-	#globalFilterRegex = $state<RegExp | null>(null);
 
+	#globalFilterRegex: RegExp | null = null;
 	#isFilterDirty = true;
 	#isSortDirty = true;
 	#filteredData: T[] = [];
@@ -93,8 +94,7 @@ export class DataTable<T> {
 	};
 
 	#matchesFilters = (row: T): boolean => {
-		return Object.keys(this.#filterState).every((columnId) => {
-			const filterSet = this.#filterState[columnId];
+		return Object.entries(this.#filterState).every(([columnId, filterSet]) => {
 			if (!filterSet || filterSet.size === 0) return true;
 
 			const colDef = this.#getColumnDef(columnId);
@@ -103,7 +103,12 @@ export class DataTable<T> {
 			const value = this.#getValue(row, columnId);
 
 			if (colDef.filter) {
-				return Array.from(filterSet).some((filterValue) => colDef.filter!(value, filterValue, row));
+				for (const filterValue of filterSet) {
+					if (colDef.filter(value, filterValue, row)) {
+						return true;
+					}
+				}
+				return false;
 			}
 
 			return filterSet.has(value);
@@ -130,12 +135,19 @@ export class DataTable<T> {
 				const aVal = this.#getValue(a, columnId);
 				const bVal = this.#getValue(b, columnId);
 
+				if (aVal === undefined || aVal === null) return direction === 'asc' ? 1 : -1;
+				if (bVal === undefined || bVal === null) return direction === 'asc' ? -1 : 1;
+
 				if (colDef && colDef.sorter) {
 					return direction === 'asc'
 						? colDef.sorter(aVal, bVal, a, b)
 						: colDef.sorter(bVal, aVal, b, a);
 				}
 
+				if (typeof aVal === 'string' && typeof bVal === 'string') {
+					return direction === 'asc' ? aVal.localeCompare(bVal) : bVal.localeCompare(aVal);
+				}
+
 				if (aVal < bVal) return direction === 'asc' ? -1 : 1;
 				if (aVal > bVal) return direction === 'asc' ? 1 : -1;
 				return 0;
@@ -170,13 +182,14 @@ export class DataTable<T> {
 	get rows() {
 		// React to changes in original data, filter state, and sort state
 		this.#originalData;
-		this.#filterState;
 		this.#sortState;
-		this.#globalFilterRegex;
+		this.#filterState;
+		this.#globalFilter;
 
 		this.#applyFilters();
 		this.#applySort();
-		const startIndex = (this.currentPage - 1) * this.#pageSize;
+
+		const startIndex = (this.#currentPage - 1) * this.#pageSize;
 		const endIndex = startIndex + this.#pageSize;
 		return this.#sortedData.slice(startIndex, endIndex);
 	}
@@ -212,9 +225,10 @@ export class DataTable<T> {
 	get totalPages() {
 		// React to changes in filter state
 		this.#filterState;
-		this.#globalFilterRegex;
+		this.#globalFilter;
 
 		this.#applyFilters();
+
 		return Math.max(1, Math.ceil(this.#filteredData.length / this.#pageSize));
 	}
 
@@ -270,7 +284,14 @@ export class DataTable<T> {
 	 */
 	set globalFilter(value: string) {
 		this.#globalFilter = value;
-		this.#globalFilterRegex = value.trim() !== '' ? new RegExp(value, 'i') : null;
+
+		try {
+			this.#globalFilterRegex = value.trim() !== '' ? new RegExp(`(?:${value})`, 'i') : null;
+		} catch (error) {
+			console.error('Invalid regex pattern:', error);
+			this.#globalFilterRegex = null;
+		}
+
 		this.#currentPage = 1;
 		this.#isFilterDirty = true;
 	}