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Closure Compiler is a JavaScript optimizing compiler. It parses your JavaScript, analyzes it, removes dead code and rewrites and minimizes what's left. It also checks syntax, variable references, and types, and warns about common JavaScript pitfalls. It is used in many of Google's JavaScript apps, including Gmail, Google Web Search, Google Maps, and Google Docs.

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/*
 * Copyright 2015 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;


import com.google.javascript.rhino.Node;
import com.google.javascript.rhino.StaticRef;
import com.google.javascript.rhino.StaticSlot;
import org.jspecify.nullness.Nullable;

/**
 * Used by {@code Scope} to store information about variables.
 */
public class Var extends AbstractVar implements StaticSlot, StaticRef {

  static final String ARGUMENTS = "arguments";
  static final String EXPORTS = "exports";

  Var(
      String name,
      @Nullable Node nameNode,
      Scope scope,
      int index,
      @Nullable CompilerInput input,
      @Nullable Node implicitGoogNamespaceDefinition) {
    super(name, nameNode, scope, index, input, implicitGoogNamespaceDefinition);
    if (nameNode != null) {
      switch (nameNode.getToken()) {
        case MODULE_BODY:
        case NAME:
        case IMPORT_STAR:
          break;
        default:
          throw new IllegalArgumentException("Invalid name node " + nameNode);
      }
    }
  }

  static Var createImplicitGoogNamespace(String name, Scope scope, Node definition) {
    return new Var(name, /* nameNode= */ null, scope, -1, /* input= */ null, definition);
  }

  @Override
  public String toString() {
    return "Var " + getName() + " @ " + getNameNode();
  }
}