ailabs-software’s gists

ailabs-software / file.dart

Created August 7, 2022 02:13

On line 15, how to break out of scope and reference dart String type?

	enum DataType
	{
	None(false, BASE_OPERATOR_TITLE_MAP), // Null or nil is this language.
	Boolean(false, BASE_OPERATOR_TITLE_MAP),
	Number(false, BASE_OPERATOR_TITLE_MAP),
	String(false, BASE_OPERATOR_TITLE_MAP),
	Date(false, BASE_OPERATOR_TITLE_MAP),
	StringArray(true, BASE_OPERATOR_TITLE_MAP), // An array of strings
	Object(false, BASE_OPERATOR_TITLE_MAP), // A catch-all type for objects types.
	DateTime(false, BASE_OPERATOR_TITLE_MAP),

ailabs-software / main.dart

Created July 25, 2022 17:40

More of more specific generic type parameter assigned to variable, causing loss of type checking.


	class Foo<T>
	{
	late T value;
	}

	void main() {

	Foo<Object?> foo1 = new Foo<String>();
	Foo<Object?> foo2 = new Foo<int>();

ailabs-software / gist:fbdbea61e2c8999d745feab4264770ab

Created June 21, 2022 02:35

Trying to send dart compile js output to stdout

	% dart compile js web/main.dart -o /dev/stdout --no-source-maps

	Almost works, but at the end there is an error:
	if (typeof dartMainRunner === "function")
	dartMainRunner(callMain, []);
	else
	callMain([]);
	});
	})();
	The compiler crashed: FileSystemException: Cannot create file, path = '/dev/stdout.deps' (OS Error: Operation not permitted, errno = 1)

ailabs-software / build.yaml

Last active January 13, 2022 04:42

	targets:
	$default:
	sources:
	- lib/**
	- web/**
	# Note that it is important to include these in the default target.
	- pubspec.*
	- $package$
	builders:
	# -----------------------

ailabs-software / test.dart

Created December 23, 2021 17:09

Trying to figure out a way say type are in class extends a generic type (IVisitor), _without_ filling in the R type parameter of visitor from the class type arg, but instead from a method named accept(). This would then enable use of visitor pattern without coupling accept() to what visit methods exist, and therefore what node types exist. This …

	abstract class IVisitor<R> {
	// visitX() methods not declared here, but
	// on implementing class, so we can add new node types,
	// without coupling the code calling accept() to that knowledge.
	}

	abstract class NodeVisitor<R> implements IVisitor<R> {
	R visitParen(Node token);
	}

ailabs-software / build.yaml

Created June 3, 2021 00:30

Example build.yaml. You might also set -O4 instead

	targets:
	$default:
	sources:
	- lib/**
	- web/**
	# Note that it is important to include these in the default target.
	- pubspec.*
	- $package$
	builders:
	# -----------------------

ailabs-software / gist:391c0ffde63b4f6066107d11bef387e9

Created May 27, 2021 17:49

Attempting to extend both an interface (abstract class) & implement overrides of those methods, using extension.


	abstract class IDataType
	{
	void render();
	}

	class StringDataType implements IDataType
	{
	@override
	void render()

ailabs-software / main.dart

Last active June 23, 2020 21:02

How can I use fields of const-constructed objects in switch cases?

	class Property
	{
	final String foo;

	const Property(String this.foo);
	}

	const Property MARGIN = const Property("margin");
	const Property PADDING = const Property("padding");

ailabs-software / main.dart

Last active June 22, 2020 17:49

Using type of property key argument's type argument to infer T, and statically check that value type matches.

	class LayoutBox { }

	class RgbColour { }


	class LayoutProperty<T>
	{
	static final LayoutProperty<LayoutBox> margin = new LayoutProperty<LayoutBox>();

	static final LayoutProperty<RgbColour> colour = new LayoutProperty<RgbColour>();

ailabs-software / gist:8834a9cc945cb234130113c1d9b66069

Created April 7, 2020 22:16

Postgresql todo list

	1) Needs more RAM (swap is 1.6GB often times)
	2) Disc is getting too full (82%), causing more SSD garbage collection/moving stuff around on disc.
	3) Not enough cores to handle 100 max_connections -- intrbiz says look at adding cores first as your load average is over core count.
	4) Application processes stealing CPU from postgres
	5) Poorly designed queries -- peerce
	Intrbiz says: Log only slow queries so you can get an idea if it is certain queries which are consistently slow.
	6) A possible change is that we are getting a lot of concurrent visits putting strain on the system through analytics caused by bots/spam filters visiting all links at once. We have been seeing that this results in a bunch of INSERT queries getting stuck running for many seconds. Do we need to change the isolation level so these INSERT queries can run smoothly concurrently?