LCS match

src/vs/base/common/filters.ts

@@ -574,3 +574,48 @@ function computeLandmarks(word: string, lowWord: string): [string, number[]] {
 
 	return [result, positions];
 }
+
+// function print(m: number[][]) {
+// 	for (const n of m) {
+// 		console.log(n.join('|'));
+// 	}
+// }
+export function matchesFuzzy5(pattern: string, word: string) {
+
+	// create matrix
+	const matrix: number[][] = [[0]];
+	for (let i = 1; i <= pattern.length; i++) {
+		matrix.push([-i]);
+	}
+	for (let i = 1; i <= word.length; i++) {
+		matrix[0].push(-i);
+	}
+
+	for (let i = 0; i < pattern.length; i++) {
+
+		let match = false;
+
+		for (let j = 0; j < word.length; j++) {
+
+			let diagScore = 0;
+			if (pattern[i] === word[j]) {
+				diagScore = 1 + matrix[i][j];
+				match = true;
+			} else {
+				diagScore = -1 + matrix[i][j];
+			}
+
+			let upScore = -1 + matrix[i][j + 1];
+			let leftScore = -1 + matrix[i + 1][j];
+
+			matrix[i + 1][j + 1] = Math.max(diagScore, upScore, leftScore);
+		}
+
+		if (!match) {
+			return undefined;
+		}
+	}
+	// print(matrix);
+
+	return [];
+}

src/vs/base/test/common/filters.perf.test.ts

@@ -5,7 +5,7 @@
 'use strict';
 
 import * as assert from 'assert';
-import { fuzzyContiguousFilter, matchesFuzzy2, matchesFuzzy3, matchesFuzzy4 } from 'vs/base/common/filters';
+import { fuzzyContiguousFilter, matchesFuzzy2, matchesFuzzy3, matchesFuzzy4, matchesFuzzy5 } from 'vs/base/common/filters';
 
 const fuzz = require.__$__nodeRequire('fuzzaldrin-plus');
 const data = <{ label: string }[]>require.__$__nodeRequire(require.toUrl('./filters.perf.data.json'));
@@ -91,6 +91,26 @@ perfSuite('Performance - fuzzyMatch', function () {
 		assert.ok(count > 0);
 	});
 
+	test('matchesFuzzy5', function () {
+
+		matchesFuzzy5('ACGTC', 'AGTC');
+
+		const t1 = Date.now();
+		let count = 0;
+		for (const pattern of patterns) {
+			for (const item of data) {
+				if (item.label) {
+					const matches = matchesFuzzy5(pattern, item.label);
+					if (matches) {
+						count += 1;
+					}
+				}
+			}
+		}
+		console.log('matchesFuzzy5', Date.now() - t1, count);
+		assert.ok(count > 0);
+	});
+
 	test('fuzzaldrin', function () {
 		const t1 = Date.now();
 		let count = 0;