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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 2017 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.ijs;

import com.google.javascript.jscomp.NodeUtil;
import com.google.javascript.jscomp.Var;
import com.google.javascript.rhino.IR;
import com.google.javascript.rhino.JSDocInfo;
import com.google.javascript.rhino.JSDocInfo.Visibility;
import com.google.javascript.rhino.JSTypeExpression;
import com.google.javascript.rhino.Node;
import com.google.javascript.rhino.SimpleSourceFile;
import com.google.javascript.rhino.StaticSourceFile;
import com.google.javascript.rhino.StaticSourceFile.SourceKind;
import com.google.javascript.rhino.Token;
import org.jspecify.nullness.Nullable;

/**
 * Static utility methods for dealing with inspecting and constructing JSDoc objects.
 */
final class JsdocUtil {
  private JsdocUtil() {}

  private static final String SYNTHETIC_FILE_NAME = "";
  private static final StaticSourceFile SYNTHETIC_FILE =
      new SimpleSourceFile(SYNTHETIC_FILE_NAME, SourceKind.EXTERN);
  private static final Node SYNTETIC_SRCINFO_NODE =
      new Node(Token.EMPTY).setStaticSourceFile(SYNTHETIC_FILE);

  static boolean isPrivate(@Nullable JSDocInfo jsdoc) {
    return jsdoc != null && jsdoc.getVisibility().equals(Visibility.PRIVATE);
  }

  static JSDocInfo getUnusableTypeJSDoc(JSDocInfo oldJSDoc) {
    return getConstJSDoc(oldJSDoc, "UnusableType");
  }

  static JSDocInfo getQmarkTypeJSDoc() {
    return makeBuilderWithType(null, new Node(Token.QMARK)).build();
  }

  private static JSDocInfo.Builder makeBuilderWithType(@Nullable JSDocInfo oldJSDoc, Node typeAst) {
    JSDocInfo.Builder builder = JSDocInfo.Builder.maybeCopyFrom(oldJSDoc);
    builder.recordType(
        new JSTypeExpression(typeAst.srcrefTree(SYNTETIC_SRCINFO_NODE), SYNTHETIC_FILE_NAME));
    return builder;
  }

  private static JSDocInfo getConstJSDoc(JSDocInfo oldJSDoc, String contents) {
    return getConstJSDoc(oldJSDoc, Node.newString(contents));
  }

  private static JSDocInfo getConstJSDoc(JSDocInfo oldJSDoc, Node typeAst) {
    JSDocInfo.Builder builder = makeBuilderWithType(oldJSDoc, typeAst);
    builder.recordConstancy();
    return builder.build();
  }

  static JSDocInfo markConstant(JSDocInfo oldJSDoc) {
    JSDocInfo.Builder builder = JSDocInfo.Builder.maybeCopyFrom(oldJSDoc);
    builder.recordConstancy();
    return builder.build();
  }

  static JSDocInfo mergeJsdocs(@Nullable JSDocInfo classicJsdoc, @Nullable JSDocInfo inlineJsdoc) {
    if (inlineJsdoc == null || !inlineJsdoc.hasType()) {
      return classicJsdoc;
    }
    JSDocInfo.Builder builder = JSDocInfo.Builder.maybeCopyFrom(classicJsdoc);
    builder.recordType(inlineJsdoc.getType());
    return builder.build();
  }

  static boolean hasAnnotatedType(JSDocInfo jsdoc) {
    if (jsdoc == null) {
      return false;
    }
    return jsdoc.hasType()
        || jsdoc.hasReturnType()
        || jsdoc.getParameterCount() > 0
        || jsdoc.isConstructorOrInterface()
        || jsdoc.hasTypedefType()
        || jsdoc.hasThisType()
        || jsdoc.hasEnumParameterType();
  }

  static @Nullable JSDocInfo getJSDocForRhs(Node rhs, JSDocInfo oldJSDoc) {
    switch (NodeUtil.getKnownValueType(rhs)) {
      case BOOLEAN:
        return getConstJSDoc(oldJSDoc, "boolean");
      case NUMBER:
        return getConstJSDoc(oldJSDoc, "number");
      case BIGINT:
        return getConstJSDoc(oldJSDoc, "bigint");
      case STRING:
        return getConstJSDoc(oldJSDoc, "string");
      case NULL:
        return getConstJSDoc(oldJSDoc, "null");
      case VOID:
        return getConstJSDoc(oldJSDoc, "void");
      case OBJECT:
        if (rhs.isRegExp()) {
          return getConstJSDoc(oldJSDoc, new Node(Token.BANG, IR.string("RegExp")));
        }
        break;
      case UNDETERMINED:
        if (oldJSDoc != null && oldJSDoc.getDescription() != null) {
          return getConstJSDoc(oldJSDoc, "string");
        }
        break;
    }
    if (rhs.isCast()) {
      return getConstJSDoc(oldJSDoc, rhs.getJSDocInfo().getType().getRoot());
    }
    return null;
  }

  static @Nullable JSDocInfo getJSDocForName(Var decl, JSDocInfo oldJSDoc) {
    if (decl == null) {
      return null;
    }
    JSTypeExpression expr = NodeUtil.getDeclaredTypeExpression(decl.getNameNode());
    if (expr == null) {
      return null;
    }
    Node typeAst = expr.getRoot();
    switch (typeAst.getToken()) {
      case EQUALS:
        Node typeRoot = typeAst.getFirstChild().cloneTree();
        if (!decl.isDefaultParam()) {
          typeRoot = new Node(Token.PIPE, typeRoot, IR.string("undefined"));
        }
        typeAst = typeRoot;
        break;
      case ITER_REST:
        {
          Node newType = new Node(Token.BANG);
          Node array = IR.string("Array");
          newType.addChildToBack(array);
          Node block = new Node(Token.BLOCK, typeAst.getFirstChild().cloneTree());
          array.addChildToBack(block);
          typeAst = newType;
          break;
        }
      default:
        break;
    }
    return getConstJSDoc(oldJSDoc, typeAst);
  }
}