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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 2016 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.transpile;

import static com.google.common.base.Preconditions.checkNotNull;
import static java.nio.charset.StandardCharsets.UTF_8;

import com.google.common.escape.Escaper;
import com.google.common.io.BaseEncoding;
import com.google.common.net.PercentEscaper;
import java.net.URI;
import java.util.Objects;

/**
 * The result of transpiling a single file.  Includes transpiled
 * and original source, and an optional source map.
 */
public final class TranspileResult {

  private final URI path;
  private final String original;
  private final String transpiled;
  private final String sourceMap;

  public TranspileResult(URI path, String original, String transpiled, String sourceMap) {
    this.path = checkNotNull(path);
    this.original = checkNotNull(original);
    this.transpiled = checkNotNull(transpiled);
    this.sourceMap = checkNotNull(sourceMap);
  }

  public URI path() {
    return path;
  }

  // TODO(sdh): how to specify naming scheme for sourcemap and original?
  //  - if we're not embedding then we need to know how to find them.
  //  - probabaly we'll keep 'path' pointing to the original, since that's
  //    what's more important and harder to find - we can add some suffix
  //    on for the transpiled version as necessary.
  public String original() {
    return original;
  }

  public String sourceMap() {
    return sourceMap;
  }

  // TODO(sdh): might be a bit nicer for this to be a suffix rather than a whole path?
  public TranspileResult embedSourcemapUrl(String url) {
    // If there's no sourcemap, don't reference it.
    if (sourceMap.isEmpty()) {
      return this;
    }
    String embedded = transpiled + "\n//# sourceMappingURL=" + url + "\n";
    return new TranspileResult(path, original, embedded, sourceMap);
  }

  // sourcemaps must escape :, and cannot escape space as +, so we need a custom escaper.
  private static final Escaper ESCAPER = new PercentEscaper("-_.*", /* plusForSpace= */ false);

  public TranspileResult embedSourcemap() {
    if (sourceMap.isEmpty()) {
      return this;
    }
    String embedded =
        transpiled + "\n//# sourceMappingURL=data:," + ESCAPER.escape(sourceMap) + "\n";
    return new TranspileResult(path, original, embedded, "");
  }

  public TranspileResult embedSourcemapBase64() {
    if (sourceMap.isEmpty()) {
      return this;
    }
    String embedded =
        transpiled
            + "\n//# sourceMappingURL=data:application/json;base64,"
            + BaseEncoding.base64().encode(sourceMap.getBytes(UTF_8))
            + "\n";
    return new TranspileResult(path, original, embedded, "");
  }

  public String transpiled() {
    return transpiled;
  }

  public boolean wasTranspiled() {
    return !transpiled.equals(original);
  }

  @Override
  public boolean equals(Object other) {
    return other instanceof TranspileResult
        && ((TranspileResult) other).path.equals(path)
        && ((TranspileResult) other).original.equals(original)
        && ((TranspileResult) other).transpiled.equals(transpiled)
        && ((TranspileResult) other).sourceMap.equals(sourceMap);
  }

  @Override
  public int hashCode() {
    return Objects.hash(path, original, transpiled, sourceMap);
  }

  @Override
  public String toString() {
    return String.format(
        "TranspileResut{path=%s, original=%s, transpiled=%s, sourceMapURL=%s}",
        path, original, transpiled, sourceMap);
  }
}