Update finite automate to match user identifiers as per spec (#10798)

Author: t3chguy

src/linkify-matrix.ts

@@ -58,6 +58,8 @@ function matrixOpaqueIdLinkifyParser({
         TLD,
         COLON,
         SYM,
+        SLASH,
+        EQUALS,
         HYPHEN,
         UNDERSCORE,
         // because 'localhost' is tokenised to the localhost token,
@@ -69,7 +71,7 @@ function matrixOpaqueIdLinkifyParser({
     const S_START = parser.start;
     const matrixSymbol = utils.createTokenClass(name, { isLink: true });
 
-    const localpartTokens = [domain, TLD, LOCALHOST, SYM, UNDERSCORE, HYPHEN];
+    const localpartTokens = [domain, TLD, DOT, LOCALHOST, SYM, SLASH, EQUALS, UNDERSCORE, HYPHEN];
     const domainpartTokens = [domain, TLD, LOCALHOST, HYPHEN];
 
     const INITIAL_STATE = S_START.tt(token);

test/linkify-matrix-test.ts

@@ -303,6 +303,22 @@ describe("linkify-matrix", () => {
 
     describe("userid plugin", () => {
         genTests("@");
+
+        it("allows dots in localparts", () => {
+            const test = "@test.:matrix.org";
+            const found = linkify.find(test);
+            expect(found).toEqual([
+                {
+                    href: test,
+                    type: "userid",
+                    value: test,
+                    start: 0,
+                    end: test.length,
+
+                    isLink: true,
+                },
+            ]);
+        });
     });
 
     describe("matrix uri", () => {