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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 2011 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.debugging.sourcemap;

import org.jspecify.nullness.Nullable;

/** Detect and parse the provided source map. */
public final class SourceMapConsumerFactory {

  /** not constructible */
  private SourceMapConsumerFactory() {}

  /**
   * @param contents The string representing the source map file contents.
   * @return The parsed source map.
   */
  public static SourceMapping parse(String contents) throws SourceMapParseException {
     return parse(contents, null);
  }

  /**
   * @param contents The string representing the source map file contents.
   * @param supplier A supplier for any referenced maps.
   * @return The parsed source map.
   */
  public static SourceMapping parse(String contents, @Nullable SourceMapSupplier supplier)
      throws SourceMapParseException {
    // Version 1, starts with a magic string
    if (contents.startsWith("/** Begin line maps. **/")) {
      throw new SourceMapParseException(
          "This appears to be a V1 SourceMap, which is not supported.");
    } else if (contents.startsWith("{")){
      SourceMapObject sourceMapObject = SourceMapObjectParser.parse(contents);

      // Check basic assertions about the format.
      switch (sourceMapObject.getVersion()) {
        case 3: {
          SourceMapConsumerV3 consumer =  new SourceMapConsumerV3();
          consumer.parse(sourceMapObject, supplier);
          return consumer;
        }
        default:
          throw new SourceMapParseException(
              "Unknown source map version:" + sourceMapObject.getVersion());
      }
    }

    throw new SourceMapParseException("unable to detect source map format");
  }
}