| // 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 utils; |
| |
| import 'dart:async'; |
| import 'dart:math'; |
| |
| enum DurationComponent { |
| Days, |
| Hours, |
| Minutes, |
| Seconds, |
| Milliseconds, |
| Microseconds |
| } |
| |
| class Utils { |
| static String formatPercentNormalized(double x) { |
| var percent = 100.0 * x; |
| return '${percent.toStringAsFixed(2)}%'; |
| } |
| |
| static String formatPercent(num a, num total) { |
| return formatPercentNormalized(a / total); |
| } |
| |
| static String zeroPad(int value, int pad) { |
| String prefix = ""; |
| while (pad > 1) { |
| int pow10 = pow(10, pad - 1) as int; |
| if (value < pow10) { |
| prefix = prefix + "0"; |
| } |
| pad--; |
| } |
| return "${prefix}${value}"; |
| } |
| |
| static String formatCommaSeparated(int v) { |
| const COMMA_EVERY = 1000; |
| if (v < COMMA_EVERY) { |
| return v.toString(); |
| } |
| var mod = v % COMMA_EVERY; |
| v ~/= COMMA_EVERY; |
| var r = '${zeroPad(mod, 3)}'; |
| while (v > COMMA_EVERY) { |
| mod = v % COMMA_EVERY; |
| r = '${zeroPad(mod, 3)},$r'; |
| v ~/= COMMA_EVERY; |
| } |
| if (v != 0) { |
| r = '$v,$r'; |
| } |
| return r; |
| } |
| |
| static String formatTimePrecise(double time) { |
| if (time == null) { |
| return "-"; |
| } |
| const millisPerSecond = 1000; |
| |
| var millis = (time * millisPerSecond).round(); |
| return formatTimeMilliseconds(millis); |
| } |
| |
| static String formatTimeMilliseconds(int millis) { |
| const millisPerHour = 60 * 60 * 1000; |
| const millisPerMinute = 60 * 1000; |
| const millisPerSecond = 1000; |
| |
| var hours = millis ~/ millisPerHour; |
| millis = millis % millisPerHour; |
| |
| var minutes = millis ~/ millisPerMinute; |
| millis = millis % millisPerMinute; |
| |
| var seconds = millis ~/ millisPerSecond; |
| millis = millis % millisPerSecond; |
| |
| if (hours > 0) { |
| return ("${zeroPad(hours, 2)}" |
| ":${zeroPad(minutes, 2)}" |
| ":${zeroPad(seconds, 2)}" |
| ".${zeroPad(millis, 3)}"); |
| } else if (minutes > 0) { |
| return ("${zeroPad(minutes, 2)}" |
| ":${zeroPad(seconds, 2)}" |
| ".${zeroPad(millis, 3)}"); |
| } else { |
| return ("${zeroPad(seconds, 2)}" |
| ".${zeroPad(millis, 3)}"); |
| } |
| } |
| |
| static String formatSize(bytesDynamic) { |
| int bytes = bytesDynamic.toInt(); |
| |
| String finish(int scale, String prefix) { |
| double scaled = bytes / scale; |
| int digits = 1; |
| if (scaled < 10) digits = 2; |
| return "${scaled.toStringAsFixed(digits)}${prefix}B"; |
| } |
| |
| const int bytesPerKB = 1024; |
| const int bytesPerMB = 1024 * bytesPerKB; |
| const int bytesPerGB = 1024 * bytesPerMB; |
| const int bytesPerTB = 1024 * bytesPerGB; |
| |
| int absBytes = bytes >= 0 ? bytes : -bytes; |
| if (absBytes < bytesPerKB) return "${bytes}B"; |
| if (absBytes < bytesPerMB) return finish(bytesPerKB, "K"); |
| if (absBytes < bytesPerGB) return finish(bytesPerMB, "M"); |
| if (absBytes < bytesPerTB) return finish(bytesPerGB, "G"); |
| return finish(bytesPerTB, "TB"); |
| } |
| |
| static String formatTime(double time) { |
| if (time == null) { |
| return "-"; |
| } |
| const millisPerHour = 60 * 60 * 1000; |
| const millisPerMinute = 60 * 1000; |
| const millisPerSecond = 1000; |
| |
| var millis = (time * millisPerSecond).round(); |
| |
| var hours = millis ~/ millisPerHour; |
| millis = millis % millisPerHour; |
| |
| var minutes = millis ~/ millisPerMinute; |
| millis = millis % millisPerMinute; |
| |
| var seconds = millis ~/ millisPerSecond; |
| |
| if (hours != 0) { |
| return '${hours}h ${minutes}m ${seconds}s'; |
| } |
| if (minutes != 0) { |
| return '${minutes}m ${seconds}s'; |
| } |
| return '${seconds}s'; |
| } |
| |
| static String formatDateTime(DateTime now) { |
| return '${now.year}-${now.month}-${now.day} ' |
| '${now.hour.toString().padLeft(2)}:' |
| '${now.minute.toString().padLeft(2)}:' |
| '${now.second.toString().padLeft(2)}'; |
| } |
| |
| static String formatDuration(Duration duration, |
| {DurationComponent precision = DurationComponent.Microseconds, |
| String future = '', |
| String past = 'ago'}) { |
| var value = duration.inMicroseconds.abs(); |
| switch (precision) { |
| case DurationComponent.Days: |
| value = (value / Duration.microsecondsPerDay).round(); |
| break; |
| case DurationComponent.Hours: |
| value = (value / Duration.microsecondsPerHour).round(); |
| break; |
| case DurationComponent.Minutes: |
| value = (value / Duration.microsecondsPerMinute).round(); |
| break; |
| case DurationComponent.Seconds: |
| value = (value / Duration.microsecondsPerSecond).round(); |
| break; |
| case DurationComponent.Milliseconds: |
| value = (value / Duration.microsecondsPerMillisecond).round(); |
| break; |
| case DurationComponent.Microseconds: |
| break; |
| } |
| final components = <String>[]; |
| if (duration.isNegative) { |
| if (!past.isEmpty) { |
| components.add(past); |
| } |
| } else { |
| if (!future.isEmpty) { |
| components.add(future); |
| } |
| } |
| switch (precision) { |
| case DurationComponent.Microseconds: |
| components.add('${value % Duration.microsecondsPerMillisecond}μs'); |
| value = (value / Duration.microsecondsPerMillisecond).floor(); |
| if (value != 0) { |
| continue Milliseconds; |
| } |
| break; |
| Milliseconds: |
| case DurationComponent.Milliseconds: |
| components.add('${value % Duration.millisecondsPerSecond}ms'); |
| value = (value / Duration.millisecondsPerSecond).floor(); |
| if (value != 0) { |
| continue Seconds; |
| } |
| break; |
| Seconds: |
| case DurationComponent.Seconds: |
| components.add('${value % Duration.secondsPerMinute}s'); |
| value = (value / Duration.secondsPerMinute).floor(); |
| ; |
| if (value != 0) { |
| continue Minutes; |
| } |
| break; |
| Minutes: |
| case DurationComponent.Minutes: |
| components.add('${value % Duration.minutesPerHour}m'); |
| value = (value / Duration.minutesPerHour).floor(); |
| if (value != 0) { |
| continue Hours; |
| } |
| break; |
| Hours: |
| case DurationComponent.Hours: |
| components.add('${value % Duration.hoursPerDay}h'); |
| value = (value / Duration.hoursPerDay).floor(); |
| if (value != 0) { |
| continue Days; |
| } |
| break; |
| Days: |
| case DurationComponent.Days: |
| components.add('${value}d'); |
| } |
| return components.reversed.join(' '); |
| } |
| |
| static String formatSeconds(double x) { |
| return x.toStringAsFixed(2); |
| } |
| |
| static String formatMillis(double x) { |
| return x.toStringAsFixed(2); |
| } |
| |
| static String formatDurationInSeconds(Duration x) => |
| formatSeconds(x.inMicroseconds / Duration.microsecondsPerSecond); |
| |
| static String formatDurationInMilliseconds(Duration x) => |
| formatMillis(x.inMicroseconds / Duration.microsecondsPerMillisecond); |
| |
| static bool runningInJavaScript() => identical(1.0, 1); |
| |
| static formatStringAsLiteral(String value, [bool wasTruncated = false]) { |
| var result = <int>[]; |
| result.add("'".codeUnitAt(0)); |
| for (int codeUnit in value.codeUnits) { |
| if (codeUnit == '\n'.codeUnitAt(0)) |
| result.addAll('\\n'.codeUnits); |
| else if (codeUnit == '\r'.codeUnitAt(0)) |
| result.addAll('\\r'.codeUnits); |
| else if (codeUnit == '\f'.codeUnitAt(0)) |
| result.addAll('\\f'.codeUnits); |
| else if (codeUnit == '\b'.codeUnitAt(0)) |
| result.addAll('\\b'.codeUnits); |
| else if (codeUnit == '\t'.codeUnitAt(0)) |
| result.addAll('\\t'.codeUnits); |
| else if (codeUnit == '\v'.codeUnitAt(0)) |
| result.addAll('\\v'.codeUnits); |
| else if (codeUnit == '\$'.codeUnitAt(0)) |
| result.addAll('\\\$'.codeUnits); |
| else if (codeUnit == '\\'.codeUnitAt(0)) |
| result.addAll('\\\\'.codeUnits); |
| else if (codeUnit == "'".codeUnitAt(0)) |
| result.addAll("'".codeUnits); |
| else if (codeUnit < 32) { |
| var escapeSequence = "\\u" + codeUnit.toRadixString(16).padLeft(4, "0"); |
| result.addAll(escapeSequence.codeUnits); |
| } else |
| result.add(codeUnit); |
| } |
| if (wasTruncated) { |
| result.addAll("...".codeUnits); |
| } else { |
| result.add("'".codeUnitAt(0)); |
| } |
| return new String.fromCharCodes(result); |
| } |
| } |
| |
| /// A [Task] that can be scheduled on the Dart event queue. |
| class Task { |
| Timer? _timer; |
| final Function callback; |
| |
| Task(this.callback); |
| |
| /// Queue [this] to run on the next Dart event queue pump. Does nothing |
| /// if [this] is already queued. |
| queue() { |
| if (_timer != null) { |
| // Already scheduled. |
| return; |
| } |
| _timer = new Timer(Duration.zero, () { |
| _timer = null; |
| callback(); |
| }); |
| } |
| } |