remove code-transformers from the repo

pkg/code_transformers/lib/messages/build_logger.dart

-// 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 code_transformers.messages.messages_logger;
-
-import 'dart:async';
-import 'dart:convert' show JSON;
-
-import 'package:barback/barback.dart';
-import 'package:source_span/source_span.dart';
-
-import 'messages.dart' show Message, MessageId, BuildLogEntry, LogEntryTable;
-
-/// A [TransformLogger] used to track error and warning messages produced during
-/// a build.
-///
-/// This logger records all messages that were logged and then forwards
-/// the calls to an underlying [TransformLogger]. The internal records support
-/// serializing the errors and emiting them to an asset (so they can be
-/// presented to the user in a web-based client), clustering similar messages
-/// together, sorting messages in order of importance, etc.
-///
-/// The logger also supports reporting error messages as warnings. Barback makes
-/// error messages stop the transformation process, which sometimes can surprise
-/// users. Turning errors into warnings is especially useful when used within
-/// `pub serve`, where we would like the transformation to continue as far as it
-/// can. When this flag is turned on, the level is still recorded as an error,
-/// so a web client UI can still highlight their importance.
-// TODO(sigmund): also cluster messages when they are reported on the
-// command-line.
-class BuildLogger implements TransformLogger {
-  /// Underling transform that is currently active.
-  final Transform _transform;
-
-  /// Logs created during the current transform.
-  final LogEntryTable _logs = new LogEntryTable();
-
-  /// Whether to use `warning` or `error` when forwarding error messages to the
-  /// underlying logger in `_transform.logger`.
-  final bool convertErrorsToWarnings;
-
-  /// Uri prefix to link for additional details. If set, messages logged through
-  /// this logger will contain an additional sentence, telling users to find
-  /// more details at `$detailsUri#packagename_id`.
-  final String detailsUri;
-
-  BuildLogger(this._transform, {this.convertErrorsToWarnings: false,
-      this.detailsUri});
-
-  /// Records a message at the fine level. If [msg] is a [Message] it is
-  /// recorded directly, otherwise it is first converted to a [String].
-  void fine(msg, {AssetId asset, SourceSpan span}) {
-    msg = msg is Message ? msg : new Message.unknown('$msg');
-    _transform.logger.fine(_snippet(msg), asset: asset, span: span);
-    _logs.add(new BuildLogEntry(msg, span, LogLevel.FINE.name));
-  }
-
-  /// Records a message at the info level. If [msg] is a [Message] it is
-  /// recorded directly, otherwise it is first converted to a [String].
-  void info(msg, {AssetId asset, SourceSpan span}) {
-    msg = msg is Message ? msg : new Message.unknown('$msg');
-    _transform.logger.info(_snippet(msg), asset: asset, span: span);
-    _logs.add(new BuildLogEntry(msg, span, LogLevel.INFO.name));
-  }
-
-  /// Records a warning message. If [msg] is a [Message] it is recorded
-  /// directly, otherwise it is first converted to a [String].
-  void warning(msg, {AssetId asset, SourceSpan span}) {
-    msg = msg is Message ? msg : new Message.unknown('$msg');
-    _transform.logger.warning(_snippet(msg), asset: asset, span: span);
-    _logs.add(new BuildLogEntry(msg, span, LogLevel.WARNING.name));
-  }
-
-  /// Records an error message. If [msg] is a [Message] it is recorded
-  /// directly, otherwise it is first converted to a [String].
-  void error(msg, {AssetId asset, SourceSpan span}) {
-    msg = msg is Message ? msg : new Message.unknown('$msg');
-    if (convertErrorsToWarnings) {
-      _transform.logger.warning(_snippet(msg), asset: asset, span: span);
-    } else {
-      _transform.logger.error(_snippet(msg), asset: asset, span: span);
-    }
-    _logs.add(new BuildLogEntry(msg, span, LogLevel.ERROR.name));
-  }
-
-  String _snippet(Message msg) {
-    var s = msg.snippet;
-    if (detailsUri == null) return s;
-    var dot = s.endsWith('.') || s.endsWith('!') || s.endsWith('?') ? '' : '.';
-    var hashTag = '${msg.id.package}_${msg.id.id}';
-    return '$s$dot See $detailsUri#$hashTag for details.';
-  }
-
-  /// Outputs the log data to a JSON serialized file.
-  Future writeOutput() {
-    return _getNextLogAssetPath().then((path) {
-      _transform.addOutput(new Asset.fromString(path,
-          JSON.encode(_logs)));
-    });
-  }
-
-  // Each phase outputs a new log file with an incrementing # appended, this
-  // figures out the next # to use.
-  Future<String> _getNextLogAssetPath([int nextNumber = 1]) {
-    var nextAssetPath = _transform.primaryInput.id.addExtension(
-        '${LOG_EXTENSION}.$nextNumber');
-    return _transform.hasInput(nextAssetPath).then((exists) {
-      if (!exists) return nextAssetPath;
-      return _getNextLogAssetPath(++nextNumber);
-    });
-  }
-
-  // Reads all log files for an Asset into [logs].
-  static Future _readLogFilesForAsset(AssetId id, Transform transform,
-      LogEntryTable entries, [nextNumber = 1]) {
-    var nextAssetPath = id.addExtension('${LOG_EXTENSION}.$nextNumber');
-    return transform.hasInput(nextAssetPath).then((exists) {
-      if (!exists) return null;
-      return transform.readInputAsString(nextAssetPath).then((data) {
-        entries.addAll(new LogEntryTable.fromJson(JSON.decode(data)));
-        return _readLogFilesForAsset(id, transform, entries, ++nextNumber);
-      });
-    });
-  }
-
-  // Combines all existing ._buildLogs.* files into a single ._buildLogs file.
-  static Future combineLogFiles(Transform transform) {
-    var entries = new LogEntryTable();
-    var id = transform.primaryInput.id;
-    return _readLogFilesForAsset(id, transform, entries).then((_) {
-      return transform.addOutput(new Asset.fromString(
-          id.addExtension(LOG_EXTENSION),
-          JSON.encode(entries.toJson())));
-    });
-  }
-
-  // Reads all logs for an asset and adds them to this loggers log output.
-  Future addLogFilesFromAsset(AssetId id, [int nextNumber = 1]) {
-    return _readLogFilesForAsset(id, _transform, _logs);
-  }
-}
-
-/// Extension used for assets that contained serialized logs.
-const String LOG_EXTENSION = '._buildLogs';