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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 2017 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.bundle;

import com.google.common.annotations.GwtIncompatible;
import com.google.common.collect.ImmutableList;
import com.google.javascript.jscomp.ErrorFormat;
import com.google.javascript.jscomp.JSError;
import com.google.javascript.jscomp.MessageFormatter;
import com.google.javascript.jscomp.SourceExcerptProvider;
import org.jspecify.nullness.Nullable;

/**
 * An unchecked exception thrown when transpilation fails due to one or
 * more errors in the input script.
 */
@GwtIncompatible
public class TranspilationException extends RuntimeException {

  private final ImmutableList errors;
  private final ImmutableList warnings;

  public TranspilationException(Exception cause) {
    this(tryCastToTranspilationException(cause.getCause()), cause);
  }

  public TranspilationException(
      SourceExcerptProvider source,
      ImmutableList errors,
      ImmutableList warnings) {
    this(errors, warnings, format(source, errors, warnings), null);
  }

  private TranspilationException(TranspilationException root, Exception cause) {
    this(root.errors, root.warnings, root.getMessage(), cause);
  }

  private TranspilationException(
      ImmutableList errors,
      ImmutableList warnings,
      String formatted,
      @Nullable Exception cause) {
    super(formatted, cause);
    this.errors = errors;
    this.warnings = warnings;
  }

  public ImmutableList errors() {
    return errors;
  }

  public ImmutableList warnings() {
    return warnings;
  }

  private static String format(
      SourceExcerptProvider source,
      ImmutableList errors,
      ImmutableList warnings) {
    StringBuilder sb = new StringBuilder().append("Transpilation failed:\n");
    MessageFormatter formatter =
        source != null
            ? ErrorFormat.SINGLELINE.toFormatter(source, false)
            : ErrorFormat.SOURCELESS.toFormatter(source, false);
    for (JSError error : errors) {
      sb.append("\n").append(formatter.formatError(error));
    }
    for (JSError warning : warnings) {
      sb.append("\n").append(formatter.formatError(warning));
    }
    return sb.toString();
  }

  private static @Nullable TranspilationException tryCastToTranspilationException(Throwable t) {
    if (t instanceof TranspilationException) {
      return (TranspilationException) t;
    }
    return null;
  }
}