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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 2015 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;

import static java.nio.charset.StandardCharsets.US_ASCII;

import com.google.common.annotations.GwtIncompatible;
import java.nio.charset.Charset;
import java.nio.charset.CharsetEncoder;
import org.jspecify.nullness.Nullable;

/**
 * Output charset encoder for {@code CodeGenerator} that delegates to a CharsetEncoder.
 *
 * TODO(moz): Add GWT compatible super-source replacement
 */
@GwtIncompatible("java.nio.charset")
final class OutputCharsetEncoder {

  private final @Nullable CharsetEncoder encoder;

  OutputCharsetEncoder(Charset outputCharset) {
    if (outputCharset == null || outputCharset == US_ASCII) {
      // If we want our default (pretending to be UTF-8, but escaping anything
      // outside of straight ASCII), then don't use the encoder, but
      // just special-case the code.  This keeps the normal path through
      // the code identical to how it's been for years.
      this.encoder = null;
    } else {
      this.encoder = outputCharset.newEncoder();
    }
  }

  boolean canEncode(char c) {
    return encoder != null && encoder.canEncode(c);
  }
}