com.google.javascript.jscomp.colors.UnionColor 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 static com.google.common.base.Preconditions.checkArgument;

import com.google.auto.value.AutoValue;
import com.google.common.collect.ImmutableCollection;
import com.google.common.collect.ImmutableSet;

/** A set of multiple {@link Color}s. */
@AutoValue
public abstract class UnionColor implements Color {

  public static UnionColor create(ImmutableSet alternates) {
    checkArgument(
        alternates.size() > 1,
        "UnionColor alternates should have more than one element, found %s",
        alternates);
    // Flatten other UnionColors
    ImmutableSet.Builder flatAlternates = ImmutableSet.builder();
    for (Color alternate : alternates) {
      if (alternate.isUnion()) {
        flatAlternates.addAll(alternate.getAlternates());
      } else {
        flatAlternates.add(alternate);
      }
    }
    return new AutoValue_UnionColor(flatAlternates.build());
  }

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

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

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

  @Override
  public abstract ImmutableCollection getAlternates();

  @Override
  public boolean isInvalidating() {
    // Union colors are invalidating if any alternates are invalidating, with the exception of
    // null/undefined.
    for (Color alt : getAlternates()) {
      if (alt.equals(PrimitiveColor.NULL_OR_VOID)) {
        continue;
      }
      if (alt.isInvalidating()) {
        return true;
      }
    }
    return false;
  }
}