// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

library barback.test.transformer.log;

import 'dart:async';

import 'package:barback/barback.dart';
import 'package:barback/src/utils.dart';

import 'mock.dart';

/// A transformer that logs given entries during its apply.
class LogTransformer extends MockTransformer {
  /// The list of entries that it should log.
  ///
  /// Each entry has the log level followed by the message, like:
  ///
  ///     error: This is the error message.
  final List<String> _entries;

  LogTransformer(this._entries);

  bool doIsPrimary(AssetId id) => true;

  void doApply(Transform transform) {
    for (var entry in _entries) {
      var parts = entry.split(":");
      var logFn;
      switch (parts[0]) {
        case "error":   logFn = transform.logger.error; break;
        case "warning": logFn = transform.logger.warning; break;
        case "info":    logFn = transform.logger.info; break;
        case "fine":    logFn = transform.logger.fine; break;
      }

      logFn(parts[1].trim());
    }
  }
}