Linter Demo

Errors: 0

Warnings: 1

File: /home/fstrocco/Dart/dart/benchmark/analyzer/lib/src/generated/incremental_logger.dart

// Copyright (c) 2014, 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 engine.incremental_logger; /** * The shared instance of [Logger] used by several incremental resolution * classes. It is initialized externally by the Analysis Engine client. */ Logger logger = NULL_LOGGER; /** * An instance of [Logger] that does not print anything. */ final Logger NULL_LOGGER = new _NullLogger(); /** * An instance of [Logger] that uses `print` for output. */ final Logger PRINT_LOGGER = new StringSinkLogger(new _PrintStringSink()); /** * A simple hierarchical logger. */ abstract class Logger { /** * Mark an enter to a new section with the given [name]. */ void enter(String name); /** * Mark an exit from the current sections, logs the duration. */ void exit(); /** * Logs the given [obj]. */ void log(Object obj); /** * Starts a new timer. */ LoggingTimer startTimer(); } /** * The handle of a timer. */ class LoggingTimer { final Logger _logger; final Stopwatch _stopwatch = new Stopwatch(); LoggingTimer(this._logger) { _stopwatch.start(); } /** * This methods stop the timer and logs the elapsed time. */ void stop(String message) { _stopwatch.stop(); _logger.log('$message in ${_stopwatch.elapsedMilliseconds} ms'); } } /** * A [Logger] that writes to a [StringSink]. */ class StringSinkLogger implements Logger { static const int _MAX_LINE_LENGTH = 512; final StringSink _sink; final List<_LoggerSection> _sectionStack = <_LoggerSection>[]; _LoggerSection _section = new _LoggerSection('', 'ROOT'); StringSinkLogger(this._sink); @override void enter(String name) { log('+++ $name'); _sectionStack.add(_section); _section = new _LoggerSection(_section.indent + '\t', name); } @override void exit() { DateTime now = new DateTime.now(); Duration duration = now.difference(_section.start); String message = '--- ${_section.name} in ${duration.inMilliseconds} ms'; _section = _sectionStack.removeLast(); log(message); } @override void log(Object obj) { DateTime now = new DateTime.now(); String indent = _section.indent; String objStr = _getObjectString(obj); String line = '[$now] $indent$objStr'; _sink.writeln(line); } @override LoggingTimer startTimer() { return new LoggingTimer(this); } String _getObjectString(Object obj) { if (obj == null) { return 'null'; } if (obj is Function) { obj = obj(); } String str = obj.toString(); if (str.length < _MAX_LINE_LENGTH) { return str; } return str.split('\n').map((String line) { if (line.length > _MAX_LINE_LENGTH) { line = line.substring(0, _MAX_LINE_LENGTH) + '...'; } return line; }).join('\n'); } } class _LoggerSection { final DateTime start = new DateTime.now(); final String indent; final String name; _LoggerSection(this.indent, this.name); } /** * A [Logger] that does nothing. */ class _NullLogger implements Logger { @override void enter(String name) {} @override void exit() {} @override void log(Object obj) {} @override LoggingTimer startTimer() { return new LoggingTimer(this); } } /** * A [StringSink] implementation that uses `print`. */ class _PrintStringSink implements StringSink { String _line = ''; @override void write(Object obj) { if (obj == null) { _line += 'null'; } else { _line += obj.toString(); } } @override void writeAll(Iterable objects, [String separator = '']) { _line += objects.join(separator); } @override void writeCharCode(int charCode) { _line += new String.fromCharCode(charCode); } @override void writeln([Object obj = '']) { _line += obj; print(_line); _line = ''; } }