Fix unexpected link end with unfinished delimiter pairs (#5)

This: http://example.org/"_(foo)
Was extracted like this: http://example.org/"_(foo

The problem was that all delimiter pairs were checked in one go, instead
of just when the delimiter actually occurred.

This also changes behavior for unbalanced brackets: A lone closing
bracket immediately terminates a link now.

src/main/java/org/nibor/autolink/internal/UrlScanner.java

@@ -77,49 +77,75 @@ private int findLast(CharSequence input, int beginIndex) {
                 case ':':
                 case ';':
                     // These may be part of an URL but not at the end
-                    continue loop;
+                    break;
                 case '/':
                     // This may be part of an URL and at the end, but not if the previous character can't be the end of an URL
-                    if (last != i - 1) {
-                        continue loop;
+                    if (last == i - 1) {
+                        last = i;
                     }
                     break;
                 case '(':
                     round++;
                     break;
                 case ')':
                     round--;
+                    if (round >= 0) {
+                        last = i;
+                    } else {
+                        // More closing than opening brackets, stop now
+                        break loop;
+                    }
                     break;
                 case '[':
                     square++;
                     break;
                 case ']':
                     square--;
+                    if (square >= 0) {
+                        last = i;
+                    } else {
+                        // More closing than opening brackets, stop now
+                        break loop;
+                    }
                     break;
                 case '{':
                     curly++;
                     break;
                 case '}':
                     curly--;
+                    if (curly >= 0) {
+                        last = i;
+                    } else {
+                        // More closing than opening brackets, stop now
+                        break loop;
+                    }
                     break;
                 case '<':
                     angle++;
                     break;
                 case '>':
                     angle--;
+                    if (angle >= 0) {
+                        last = i;
+                    } else {
+                        // More closing than opening brackets, stop now
+                        break loop;
+                    }
                     break;
                 case '"':
                     doubleQuote = !doubleQuote;
+                    if (!doubleQuote) {
+                        last = i;
+                    }
                     break;
                 case '\'':
                     singleQuote = !singleQuote;
+                    if (!singleQuote) {
+                        last = i;
+                    }
                     break;
                 default:
                     last = i;
-                    continue loop;
-            }
-            if (round >= 0 && square >= 0 && curly >= 0 && angle >= 0 && !doubleQuote && !singleQuote) {
-                last = i;
             }
         }
         return last;

src/test/java/org/nibor/autolink/AutolinkUrlTest.java

@@ -113,11 +113,23 @@ public void matchingPunctuationTricky() {
         assertLinked("(http://example.org/).", "(|http://example.org/|).");
         assertLinked("(http://example.org/.)", "(|http://example.org/|.)");
         assertLinked("http://example.org/>", "|http://example.org/|>");
-        // not sure about these:
-        assertLinked("http://example.org/(", "|http://example.org/(|");
+        // not sure about these
+        assertLinked("http://example.org/(", "|http://example.org/|(");
+        assertLinked("http://example.org/(.", "|http://example.org/|(.");
         assertLinked("http://example.org/]()", "|http://example.org/|]()");
     }
 
+    @Test
+    public void quotes() {
+        assertLinked("http://example.org/\"_(foo)", "|http://example.org/\"_(foo)|");
+        assertLinked("http://example.org/\"_(foo)\"", "|http://example.org/\"_(foo)\"|");
+        assertLinked("http://example.org/\"\"", "|http://example.org/\"\"|");
+        assertLinked("http://example.org/\"\"\"", "|http://example.org/\"\"|\"");
+        assertLinked("http://example.org/\".", "|http://example.org/|\".");
+        assertLinked("http://example.org/\"a", "|http://example.org/\"a|");
+        assertLinked("http://example.org/it's", "|http://example.org/it's|");
+    }
+
     @Test
     public void html() {
         assertLinked("http://example.org\">", "|http://example.org|\">");
@@ -143,6 +155,7 @@ public void slash() {
     public void multiple() {
         assertLinked("http://one.org/ http://two.org/", "|http://one.org/| |http://two.org/|");
         assertLinked("http://one.org/ : http://two.org/", "|http://one.org/| : |http://two.org/|");
+        assertLinked("(http://one.org/)(http://two.org/)", "(|http://one.org/|)(|http://two.org/|)");
     }
 
     @Test