A useful library for output structured information of debugging into console
The information can be structured as a table, tree or json. So it is possible to measure the performance of a function or piece of code.
import "dart:math" as Math;
import 'package:dlog/dlog.dart' as dlog;
double rad(num deg) =>
deg * (Math.PI / 180);
main() {
// create new table and specify the column number
var table = new dlog.Table(1);
// you can add header names (optional)
// in this case the number of columns is changed to 3
table.columns.add("deg°");
table.columns.addAll(["radian", "vector (x, y)"]);
for (int angle = 0; angle < 360; angle++) {
String x = (1 * Math.sin(angle)).toStringAsFixed(4),
y = (1 * Math.cos(angle)).toStringAsFixed(4);
// add row (number of cell equal columns number)
table.data.addAll([
angle, // deg°
rad(angle), // radian
[x, y] // vector (x, y)
]);
}
// cut part of table
var pi = table.clone().crop(0, 180),
pi2 = table.clone().crop(180, 180);
// output to console
print(table);
// output range 0-179
print(pi);
// output range 180-359
print(pi2);
}
Result:
┌──────┬──────────────────────┬────────────────────┐ │ DEG° │ RADIAN │ VECTOR (X, Y) │ ├──────┼──────────────────────┼────────────────────┤ │ 0 │ 0.0 │ [0.0000, 1.0000] │ ├──────┼──────────────────────┼────────────────────┤ │ 1 │ 0.017453292519943295 │ [0.8415, 0.5403] │ ├──────┼──────────────────────┼────────────────────┤ │ 2 │ 0.03490658503988659 │ [0.9093, -0.4161] │ ├──────┼──────────────────────┼────────────────────┤ │ 3 │ 0.05235987755982989 │ [0.1411, -0.9900] │ ├──────┼──────────────────────┼────────────────────┤ │ 4 │ 0.06981317007977318 │ [-0.7568, -0.6536] │ ├──────┼──────────────────────┼────────────────────┤ │ 5 │ 0.08726646259971647 │ [-0.9589, 0.2837] │ ├──────┼──────────────────────┼────────────────────┤ │ 6 │ 0.10471975511965978 │ [-0.2794, 0.9602] │ ├──────┼──────────────────────┼────────────────────┤ │ 7 │ 0.12217304763960307 │ [0.6570, 0.7539] │ ├──────┼──────────────────────┼────────────────────┤ │ 8 │ 0.13962634015954636 │ [0.9894, -0.1455] │ ├──────┼──────────────────────┼────────────────────┤ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ├──────┼──────────────────────┼────────────────────┤ │ 354 │ 6.178465552059927 │ [0.8415, -0.5403] │ ├──────┼──────────────────────┼────────────────────┤ │ 355 │ 6.19591884457987 │ [-0.0000, -1.0000] │ ├──────┼──────────────────────┼────────────────────┤ │ 356 │ 6.213372137099813 │ [-0.8415, -0.5403] │ ├──────┼──────────────────────┼────────────────────┤ │ 357 │ 6.230825429619756 │ [-0.9093, 0.4162] │ ├──────┼──────────────────────┼────────────────────┤ │ 358 │ 6.2482787221397 │ [-0.1411, 0.9900] │ ├──────┼──────────────────────┼────────────────────┤ │ 359 │ 6.265732014659643 │ [0.7568, 0.6536] │ └──────┴──────────────────────┴────────────────────┘
import 'package:dlog/dlog.dart' as dlog;
List<Map> users = [
{
"name": "Dmitry",
"age": 23,
"city": "Yekaterinburg"
},
{
"name": "Alexandr",
"age": 28,
"city": "Moskow"
}
];
main() {
var tree = new dlog.Tree("Users");
// required opening root group
tree.openGroup();
for (int i = 0; i < users.length; i++) {
tree
// add name
..add(users[i]["name"])
// open user group
// (previous element is the name of the group following)
..openGroup()
// subitems
..add("age: ${users[i]["age"]}")
..add("city: ${users[i]["city"]}")
// close user group
..closeGroup()
;
}
// close root group and output in console
print(tree..closeGroup());
}
Result
Users │ ├ Dmitry │ │ ├ age: 23 │ │ └ city: Yekaterinburg │ ├ Alexandr │ │ ├ age: 28 │ │ └ city: Moskow
import "package:dlog/dlog.dart" as dlog;
import "dart:convert";
main() {
// create Json object and
var debug = new dlog.Json(
title: "My",
data: new List()
);
debug.data = getJSON();
debug.title += " json";
// max length for string (set null for output full string)
debug.maxStringLen = 50;
// custom data parsers (custom parsers for List, Map and String types will be ignored)
debug.parsers["int"] = (int num) => "$num <-- int";
// no clear buffer [by default: true]
debug.flush = false;
// output
print(debug);
}
Result
My json
[
0: {
_id: "54bde2ec6d0c45fe2aad89a1",
index: 0 <-- int,
guid: "391ad3b0-e003-44fe-8f52-9a53b0d2ce52",
isActive: true,
balance: "$3,385.54",
picture: "http://placehold.it/32x32",
age: 25 <-- int,
eyeColor: "blue",
name: "Burns Avery",
gender: "male",
company: "COMTRAIL",
email: "burnsavery@comtrail.com",
phone: "+1 (829) 415-3400",
address: "496 Hemlock Street, Hegins, New Mexico, 4698",
about: "Qui ex labore irure proident aute veniam sit minim...",
registered: "2014-09-19T00:05:13 -05:00",
latitude: -2.302439,
longitude: 92.194414,
tags: [
0: "commodo",
1: "eu",
2: "deserunt",
3: "quis",
4: "dolor",
5: "nulla",
6: "ad"
],
friends: [
0: {
id: 0 <-- int,
name: "Katheryn Rogers"
},
1: {
id: 1 <-- int,
name: "Corine Smith"
},
2: {
id: 2 <-- int,
name: "Jacobson Christensen"
}
],
greeting: "Hello, Burns Avery! You have 3 unread messages.",
favoriteFruit: "strawberry"
}
]
Opportunity to detect run-time function
import "dart:math";
import "package:dlog/dlog.dart" as dlog;
sleep() {
DateTime init = new DateTime.now();
int ms = 1500;
while (ms > new DateTime.now().difference(init).inMilliseconds);
}
main() {
// create Time object and specity descrption
var debug = new dlog.Time("Time test for power function");
// call check before a separate logical operation
debug.checkBegin("complex random");
// some logic
int len = 1000;
while (len-- > 0) {
sqrt(pow(new Random().nextDouble(), new Random().nextDouble()) * new Random().nextDouble());
}
// and after completion
debug.checkEnd("complex random");
debug.checkFunc("sleep function", sleep);
debug.checkFunc("check power speed", (){
for (int i = 0; i < 100000; i++) {
pow(i, 100);
}
});
// output
print(debug);
}
Result
──────────────────────────────────────────────── Time test for power function ─────┬────────────────┬───────────────────────── 1 │ 0:00:00.014000 │ complex random 2 │ 0:00:01.500000 │ sleep function 3 │ 0:00:00.414000 │ check power speed ─────┴────────────────┴─────────────────────────
Please file feature requests and bugs at the issue tracker.