Merge Java21InputAstVisitor into JavaInputAstVisitor

In preparation for raising the minimum supported JDK version to JDK 21.

PiperOrigin-RevId: 811349632

Author: cushon

core/pom.xml

@@ -223,31 +223,6 @@
   </build>
 
   <profiles>
-    <profile>
-      <id>jdk17</id>
-      <activation>
-        <jdk>[17,21)</jdk>
-      </activation>
-      <build>
-        <plugins>
-          <plugin>
-            <groupId>org.apache.maven.plugins</groupId>
-            <artifactId>maven-compiler-plugin</artifactId>
-            <configuration>
-              <excludes>
-                <exclude>**/Java21InputAstVisitor.java</exclude>
-              </excludes>
-            </configuration>
-          </plugin>
-          <plugin>
-            <artifactId>maven-javadoc-plugin</artifactId>
-            <configuration>
-              <excludePackageNames>com.google.googlejavaformat.java.java21</excludePackageNames>
-            </configuration>
-          </plugin>
-        </plugins>
-      </build>
-    </profile>
     <profile>
       <id>native</id>
       <build>

core/src/main/java/com/google/googlejavaformat/java/Formatter.java

@@ -150,14 +150,7 @@ public CharSequence getCharContent(boolean ignoreEncodingErrors) throws IOExcept
     }
     OpsBuilder builder = new OpsBuilder(javaInput, javaOutput);
     // Output the compilation unit.
-    JavaInputAstVisitor visitor;
-    if (Runtime.version().feature() >= 21) {
-      visitor =
-          createVisitor(
-              "com.google.googlejavaformat.java.java21.Java21InputAstVisitor", builder, options);
-    } else {
-      visitor = new JavaInputAstVisitor(builder, options.indentationMultiplier());
-    }
+    JavaInputAstVisitor visitor = new JavaInputAstVisitor(builder, options.indentationMultiplier());
     visitor.scan(unit, null);
     builder.sync(javaInput.getText().length());
     builder.drain();
@@ -167,18 +160,6 @@ public CharSequence getCharContent(boolean ignoreEncodingErrors) throws IOExcept
     javaOutput.flush();
   }
 
-  private static JavaInputAstVisitor createVisitor(
-      final String className, final OpsBuilder builder, final JavaFormatterOptions options) {
-    try {
-      return Class.forName(className)
-          .asSubclass(JavaInputAstVisitor.class)
-          .getConstructor(OpsBuilder.class, int.class)
-          .newInstance(builder, options.indentationMultiplier());
-    } catch (ReflectiveOperationException e) {
-      throw new LinkageError(e.getMessage(), e);
-    }
-  }
-
   static boolean errorDiagnostic(Diagnostic<?> input) {
     if (input.getKind() != Diagnostic.Kind.ERROR) {
       return false;

core/src/main/java/com/google/googlejavaformat/java/JavaInputAstVisitor.java

@@ -97,7 +97,10 @@
 import com.sun.source.tree.CompilationUnitTree;
 import com.sun.source.tree.CompoundAssignmentTree;
 import com.sun.source.tree.ConditionalExpressionTree;
+import com.sun.source.tree.ConstantCaseLabelTree;
 import com.sun.source.tree.ContinueTree;
+import com.sun.source.tree.DeconstructionPatternTree;
+import com.sun.source.tree.DefaultCaseLabelTree;
 import com.sun.source.tree.DirectiveTree;
 import com.sun.source.tree.DoWhileLoopTree;
 import com.sun.source.tree.EmptyStatementTree;
@@ -125,6 +128,8 @@
 import com.sun.source.tree.OpensTree;
 import com.sun.source.tree.ParameterizedTypeTree;
 import com.sun.source.tree.ParenthesizedTree;
+import com.sun.source.tree.PatternCaseLabelTree;
+import com.sun.source.tree.PatternTree;
 import com.sun.source.tree.PrimitiveTypeTree;
 import com.sun.source.tree.ProvidesTree;
 import com.sun.source.tree.RequiresTree;
@@ -359,6 +364,12 @@ private boolean inExpression() {
 
   @Override
   public Void scan(Tree tree, Void unused) {
+    // Pre-visit AST for preview features, since com.sun.source.tree.AnyPattern can't be
+    // accessed directly without --enable-preview.
+    if (tree instanceof JCTree.JCAnyPattern) {
+      visitJcAnyPattern((JCTree.JCAnyPattern) tree);
+      return null;
+    }
     inExpression.addLast(tree instanceof ExpressionTree || inExpression.peekLast());
     int previous = builder.depth();
     try {
@@ -2001,7 +2012,7 @@ public Void visitCase(CaseTree node, Void unused) {
       builder.close();
     }
 
-    final ExpressionTree guard = getGuard(node);
+    final ExpressionTree guard = node.getGuard();
     if (guard != null) {
       builder.breakToFill(" ");
       token("when");
@@ -2041,10 +2052,6 @@ public Void visitCase(CaseTree node, Void unused) {
     return null;
   }
 
-  protected ExpressionTree getGuard(final CaseTree node) {
-    return null;
-  }
-
   @Override
   public Void visitSwitch(SwitchTree node, Void unused) {
     sync(node);
@@ -3775,7 +3782,11 @@ protected int declareOne(
   }
 
   protected void variableName(Name name) {
-    visit(name);
+    if (name.isEmpty()) {
+      token("_");
+    } else {
+      visit(name);
+    }
   }
 
   private void maybeAddDims(Deque<List<? extends AnnotationTree>> annotations) {
@@ -4153,4 +4164,46 @@ public Void visitSwitchExpression(SwitchExpressionTree node, Void aVoid) {
     visitSwitch(node.getExpression(), node.getCases());
     return null;
   }
+
+  @Override
+  public Void visitDefaultCaseLabel(DefaultCaseLabelTree node, Void unused) {
+    token("default");
+    return null;
+  }
+
+  @Override
+  public Void visitPatternCaseLabel(PatternCaseLabelTree node, Void unused) {
+    scan(node.getPattern(), null);
+    return null;
+  }
+
+  @Override
+  public Void visitConstantCaseLabel(ConstantCaseLabelTree node, Void aVoid) {
+    scan(node.getConstantExpression(), null);
+    return null;
+  }
+
+  @Override
+  public Void visitDeconstructionPattern(DeconstructionPatternTree node, Void unused) {
+    scan(node.getDeconstructor(), null);
+    builder.open(plusFour);
+    token("(");
+    builder.breakOp();
+    boolean afterFirstToken = false;
+    for (PatternTree pattern : node.getNestedPatterns()) {
+      if (afterFirstToken) {
+        token(",");
+        builder.breakOp(" ");
+      }
+      afterFirstToken = true;
+      scan(pattern, null);
+    }
+    builder.close();
+    token(")");
+    return null;
+  }
+
+  private void visitJcAnyPattern(JCTree.JCAnyPattern unused) {
+    token("_");
+  }
 }

core/src/main/java/com/google/googlejavaformat/java/java21/Java21InputAstVisitor.java

@@ -2,14 +2,5 @@
   {
     "name": "com.sun.tools.javac.parser.UnicodeReader",
     "allDeclaredMethods": true
-  },
-  {
-    "name": "com.google.googlejavaformat.java.java21.Java21InputAstVisitor",
-    "methods": [
-      {
-        "name": "<init>",
-        "parameterTypes": ["com.google.googlejavaformat.OpsBuilder", "int"]
-      }
-    ]
   }
 ]