Ivan Kochurkin KvanTTT

Kotlin Compiler Developer (Frontend). Also, I do all these things.

222 followers · 39 following

@JetBrains @Kotlin @antlr
Amsterdam, The Netherlands
05:53 (UTC +02:00)
https://www.linkedin.com/in/kvanttt/
@KvanTTT
https://stackoverflow.com/users/1046374/ivan-kochurkin

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KvanTTT / RationalNumberCounting.cs

Created September 22, 2012 09:04

Rational numbers counting (with inverse)

	public static long RationalNumber(long i, long j)
	{
	if (j == 1)
	{
	if (i == 0)
	return 1;
	else if (i == 1)
	return 2;
	}

KvanTTT / PolynomialRegression.cs

Last active July 28, 2020 07:48

Implementation of Polynomial regression (http://en.wikipedia.org/wiki/Polynomial_regression) with Math.NET library (http://www.mathdotnet.com/)

	using MathNet.Numerics.LinearAlgebra.Double;
	using MathNet.Numerics.LinearAlgebra.Generic;

	public class PolynomialRegression
	{
	private int _order;
	private Vector<double> _coefs;

	/// <summary>
	/// Calculates polynom regression for xData = [x1, x2, ... , xn] and yData = [y1, y2, ... , yn].

KvanTTT / PolygonTriangulator.cs

Created October 8, 2012 21:31

Short solution for splitting concave polygon on convex polygons or triangles with other utils (SelfIntersection checking).

	using System.Collections.Generic;
	using System.Drawing;

	public class PolygonTriangulator
	{
	/// <summary>
	/// Calculate list of convex polygons or triangles.
	/// </summary>
	/// <param name="Polygon">Input polygon without self-intersections (it can be checked with SelfIntersection().</param>
	/// <param name="triangulate">true: splitting on triangles; false: splitting on convex polygons.</param>

KvanTTT / AsciimationQuine_1_3.bat

Last active May 21, 2016 22:07

Result of generated quine with https://github.com/KvanTTT/Freaky-Sources

	echo off

	:LOOP
	"C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe" "Asciimation_1_3.cs"
	"Asciimation_1_3.exe" > "Asciimation_1_3.cs"
	type "Asciimation_1_3.cs"
	goto LOOP

	:END

KvanTTT / QuineSnake.bat

Last active September 16, 2019 13:08

Game Snake in source code (Quine). One can play this with batch or power scripts. The game can be finished =)

	echo off

	:LOOP
	"C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe" "QuineSnake.cs"
	"QuineSnake.exe" > "QuineSnake.cs"
	type "QuineSnake.cs"
	goto LOOP

	:END

KvanTTT / QuineClock.bat

Created July 12, 2015 16:34

QuineClock

	echo off

	:LOOP
	"C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe" "QuineClock.cs"
	"QuineClock.exe" > "QuineClock.cs"
	type "QuineClock.cs"
	goto LOOP

	:END

KvanTTT / ManyStringConcatenation.java

Created October 20, 2015 17:07

ANTLR Java7.g4 very slow performance sample (~15 sec Java.g4 versus ~0.15 sec Java8.g4 even with two-stage parsing strategy).

	class Test
	{
	@ApiModelProperty(value =
	"0123456789012345678901234567890123456789" +
	"0123456789012345678901234567890123456789" +
	"0123456789012345678901234567890123456789" +
	"0123456789012345678901234567890123456789" +
	"0123456789012345678901234567890123456789" +
	"0123456789012345678901234567890123456789" +
	"0123456789012345678901234567890123456789" +

KvanTTT / CSharp6_features.cs

Last active November 2, 2017 23:14

	using static System.Console;
	using static System.Math;
	using static System.DayOfWeek;
	using static System.Linq.Enumerable;

	namespace CSharp6Samples
	{
	public class Test
	{
	// Initializers for auto-properties

KvanTTT / CSharpAntlrParser.cs

Last active May 13, 2021 18:31

ANTLR C# runtime code fragment for correct C# code parsing with preprocessor directives (for CSharp grammar in oficial repository: https://github.com/antlr/grammars-v4/tree/master/csharp).

	List<IToken> codeTokens = new List<IToken>();
	List<IToken> commentTokens = new List<IToken>();

	Lexer preprocessorLexer = new CSharpLexer(new AntlrInputStream(sourceCode));
	// Collect all tokens with lexer (CSharpLexer.g4).
	var tokens = preprocessorLexer.GetAllTokens();
	var directiveTokens = new List<IToken>();
	var directiveTokenSource = new ListTokenSource(directiveTokens);
	var directiveTokenStream = new CommonTokenStream(directiveTokenSource, CSharpLexer.DIRECTIVE);
	CSharpPreprocessorParser preprocessorParser = new CSharpPreprocessorParser(directiveTokenStream);

KvanTTT / CSharp6FeaturiesWalker.cs

Last active July 7, 2017 20:05

Walker for detection C# 6 syntax features

	public class CSharp6FeaturiesWalker : CSharpSyntaxWalker
	{
	public bool CSharp6Featuries { get; private set; }

	public CSharp6FeatureWalker()
	{
	}

	public override void VisitPropertyDeclaration(PropertyDeclarationSyntax node)
	{

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