perf: avoid unnecessary String construction

src/main/java/io/github/treesitter/jtreesitter/CapturesIterator.java

@@ -38,7 +38,7 @@ public CapturesIterator(
 
     @Override
     public boolean tryAdvance(Consumer<? super SimpleImmutableEntry<Integer, QueryMatch>> action) {
-        var hasNoText = tree.getText() == null;
+        var hasNoText = !tree.hasText();
         MemorySegment match = allocator.allocate(TSQueryMatch.layout());
         MemorySegment index = allocator.allocate(C_INT);
         var captureNames = query.getCaptureNames();

src/main/java/io/github/treesitter/jtreesitter/MatchesIterator.java

@@ -36,7 +36,7 @@ public MatchesIterator(
 
     @Override
     public boolean tryAdvance(Consumer<? super QueryMatch> action) {
-        var hasNoText = tree.getText() == null;
+        var hasNoText = !tree.hasText();
         MemorySegment match = allocator.allocate(TSQueryMatch.layout());
         var captureNames = query.getCaptureNames();
         while (ts_query_cursor_next_match(cursor, match)) {

src/main/java/io/github/treesitter/jtreesitter/Tree.java

@@ -44,6 +44,10 @@ MemorySegment segment() {
         return self;
     }
 
+    boolean hasText() {
+        return charset != null;
+    }
+
     @Nullable
     String getRegion(@Unsigned int start, @Unsigned int end) {
         var length = Math.min(end, source.length) - start;
@@ -57,7 +61,7 @@ public Language getLanguage() {
 
     /** Get the source code of the syntax tree, if available. */
     public @Nullable String getText() {
-        return charset != null ? new String(source, charset) : null;
+        return hasText() ? new String(source, charset) : null;
     }
 
     /** Get the root node of the syntax tree. */
@@ -161,6 +165,6 @@ public void close() throws RuntimeException {
 
     @Override
     public String toString() {
-        return "Tree{language=%s, source=%s}".formatted(language, source);
+        return "Tree{language=%s, source=%s}".formatted(language, getText());
     }
 }

src/test/java/io/github/treesitter/jtreesitter/QueryTest.java

@@ -181,12 +181,13 @@ void getPatternAssertions() {
 
     @Test
     void queryWithTwoPredicates() {
-        var source = """
+        var source =
+                """
                 ((identifier) @foo
                  (#eq? @foo "foo")
                  (#not-eq? @foo "bar"))
                 """
-                .stripIndent();
+                        .stripIndent();
         assertQuery(source, query -> {
             assertEquals(1, query.getPatternCount());
             assertIterableEquals(List.of("foo"), query.getCaptureNames());