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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 2011 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.trees;

import static com.google.common.base.Preconditions.checkNotNull;

import com.google.errorprone.annotations.CanIgnoreReturnValue;
import com.google.javascript.jscomp.parsing.parser.IdentifierToken;
import com.google.javascript.jscomp.parsing.parser.util.SourceRange;
import org.jspecify.nullness.Nullable;

public class FunctionDeclarationTree extends ParseTree {

  public static enum Kind {
    DECLARATION,
    EXPRESSION,
    MEMBER,
    ARROW
  }

  public final @Nullable IdentifierToken name;
  public final FormalParameterListTree formalParameterList;
  public final ParseTree functionBody;
  public final boolean isStatic;
  public final boolean isGenerator;
  public final boolean isOptional;
  public final boolean isAsync;
  public final Kind kind;

  public static Builder builder(Kind kind) {
    return new Builder(kind);
  }

  private FunctionDeclarationTree(Builder builder) {
    super(ParseTreeType.FUNCTION_DECLARATION, builder.location);

    this.name = builder.name;
    this.isStatic = builder.isStatic;
    this.isGenerator = builder.isGenerator;
    this.isOptional = builder.isOptional;
    this.kind = checkNotNull(builder.kind);
    this.formalParameterList = checkNotNull(builder.formalParameterList);
    this.functionBody = checkNotNull(builder.functionBody);
    this.isAsync = builder.isAsync;
  }

  /**
   * Builds a {@link FunctionDeclarationTree}.
   */
  public static class Builder {
    private final Kind kind;

    private @Nullable IdentifierToken name = null;
    private @Nullable FormalParameterListTree formalParameterList = null;
    private @Nullable ParseTree functionBody = null;
    private boolean isStatic = false;
    private boolean isGenerator = false;
    private boolean isOptional = false;
    private boolean isAsync = false;
    private SourceRange location;

    Builder(Kind kind) {
      this.kind = kind;
    }

    /**
     * Optional function name.
     *
     * Default is {@code null}.
     */
    @CanIgnoreReturnValue
    public Builder setName(IdentifierToken name) {
      this.name = name;
      return this;
    }

    /** Required parameter list. */
    @CanIgnoreReturnValue
    public Builder setFormalParameterList(FormalParameterListTree formalParameterList) {
      this.formalParameterList = formalParameterList;
      return this;
    }

    /** Required function body. */
    @CanIgnoreReturnValue
    public Builder setFunctionBody(ParseTree functionBody) {
      this.functionBody = functionBody;
      return this;
    }

    /**
     * Is the method static?
     *
     * 
Default is {@code false}. Only relevant for method member declarations.
     */
    @CanIgnoreReturnValue
    public Builder setStatic(boolean isStatic) {
      this.isStatic = isStatic;
      return this;
    }

    /**
     * Is this a generator function?
     *
     * 
Default is {@code false}.
     */
    @CanIgnoreReturnValue
    public Builder setGenerator(boolean isGenerator) {
      this.isGenerator = isGenerator;
      return this;
    }

    /**
     * Is this the declaration of an optional function parameter? Default is {@code false}.
     *
     * 
Only relevant for function declaration as a parameter to another function.
     */
    @CanIgnoreReturnValue
    public Builder setOptional(boolean isOptional) {
      this.isOptional = isOptional;
      return this;
    }

    /**
     * Is this an asynchronous function?
     *
     * 
Default is {@code false}.
     */
    @CanIgnoreReturnValue
    public Builder setAsync(boolean isAsync) {
      this.isAsync = isAsync;
      return this;
    }

    /**
     * Return a new {@link FunctionDeclarationTree}.
     *
     *  The location is provided at this point because it cannot be correctly calculated
     * until the whole function has been parsed.
     */
    public FunctionDeclarationTree build(SourceRange location) {
      this.location = location;
      return new FunctionDeclarationTree(this);
    }
  }
}