Track whether Functions/Setters/Getters are ES6 class members

PiperOrigin-RevId: 722822171

Author: Closure Team

src/com/google/javascript/jscomp/parsing/parser/ClassOrObjectElementInfo.java

@@ -0,0 +1,86 @@
+/*
+ * Copyright 2025 The Closure Compiler Authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.javascript.jscomp.parsing.parser;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+import static com.google.common.base.Preconditions.checkState;
+
+import com.google.javascript.jscomp.parsing.parser.trees.ParseTree;
+import com.google.javascript.jscomp.parsing.parser.util.SourcePosition;
+
+/**
+ * Gathers information for ES6 class / Object literal methods, getters, setters and fields.
+ *
+ * <p>Gathers: the start position, whether it is a class element (false for object literal), whether
+ * it is static (only for class elements), and, after construction, the name IdentifierToken or
+ * ParseTree.
+ *
+ * <p>Used by {@link Parser} but separated out to enforce visibility.
+ */
+class ClassOrObjectElementInfo {
+  /** The start position of the element. */
+  final SourcePosition start;
+
+  /** Whether this is a class member. False for object literal elements. */
+  final boolean isClassMember;
+
+  /** Whether this class element is static. Can only be true if {@link #isClassMember} is true. */
+  final boolean isStatic;
+
+  private IdentifierToken name;
+  private ParseTree nameExpr;
+
+  private ClassOrObjectElementInfo(SourcePosition start, boolean isClassMember, boolean isStatic) {
+    this.start = start;
+    this.isClassMember = isClassMember;
+    this.isStatic = isStatic;
+  }
+
+  static ClassOrObjectElementInfo createClassMemberInfo(SourcePosition start, boolean isStatic) {
+    return new ClassOrObjectElementInfo(start, /* isClassMember= */ true, isStatic);
+  }
+
+  static ClassOrObjectElementInfo createObjectLiteralElementInfo(SourcePosition start) {
+    return new ClassOrObjectElementInfo(start, /* isClassMember= */ false, /* isStatic= */ false);
+  }
+
+  void setName(IdentifierToken name) {
+    checkState(nameExpr == null);
+    this.name = name;
+  }
+
+  boolean hasName() {
+    return name != null;
+  }
+
+  IdentifierToken getName() {
+    return checkNotNull(name);
+  }
+
+  void setNameExpr(ParseTree nameExpr) {
+    checkState(name == null);
+    this.nameExpr = nameExpr;
+  }
+
+  boolean hasNameExpr() {
+    return nameExpr != null;
+  }
+
+  ParseTree getNameExpr() {
+    return checkNotNull(nameExpr);
+  }
+}