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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 2021 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.serialization;

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

import com.google.common.collect.ImmutableList;
import com.google.javascript.jscomp.colors.Color;
import com.google.javascript.jscomp.colors.StandardColors;

/** TypePointer utilities. */
final class TypePointers {

  /**
   * The first N TypePointer pool offsets correspond to axiomatic colors in this order.
   *
   * These colors are never serialized because all their information is constant.
   */
  static final ImmutableList OFFSET_TO_AXIOMATIC_COLOR =
      ImmutableList.of(
          StandardColors.UNKNOWN,
          StandardColors.BOOLEAN,
          StandardColors.STRING,
          StandardColors.NUMBER,
          StandardColors.NULL_OR_VOID,
          StandardColors.SYMBOL,
          StandardColors.BIGINT,
          StandardColors.TOP_OBJECT);

  static final int AXIOMATIC_COLOR_COUNT = OFFSET_TO_AXIOMATIC_COLOR.size();

  static int trimOffset(int x) {
    checkState(x >= AXIOMATIC_COLOR_COUNT, x);
    return x - AXIOMATIC_COLOR_COUNT;
  }

  static int untrimOffset(int x) {
    checkState(x >= 0, x);
    return x + AXIOMATIC_COLOR_COUNT;
  }

  static boolean isAxiomatic(int x) {
    return x < AXIOMATIC_COLOR_COUNT;
  }

  private TypePointers() {
    throw new AssertionError();
  }
}