com.google.javascript.jscomp.colors.PrimitiveColor Maven / Gradle / Ivy

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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 2020 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.colors;

import com.google.common.collect.ImmutableCollection;

/** Value types that are a) not user-defined and b) do not need individual classes */
public enum PrimitiveColor implements Color {
  // JS primitive types
  NUMBER,
  STRING,
  SYMBOL,
  NULL_OR_VOID,
  BIGINT,
  BOOLEAN,
  // Equivalent to Closure '*'/'?' and TS unknown/any
  UNKNOWN;

  @Override
  public boolean isPrimitive() {
    return true;
  }

  @Override
  public boolean isUnion() {
    return false;
  }

  @Override
  public boolean isObject() {
    return false;
  }

  @Override
  public ImmutableCollection getAlternates() {
    // In theory we could consider a primitive a union of a single value. It's not clear whether
    // that would be simpler or not.
    throw new UnsupportedOperationException("Can only call getAlternates() on unions");
  }

  @Override
  public boolean isInvalidating() {
    return true;
  }
}