Add more C# language features and syntax sugar to highlightning #239
Description
See github-linguist/linguist#5838
Describe the enhancement
Currently not all syntax features of C# are highlighted.
My suggestion includes the following (if you would find something missing, feel free to add):
Missing features
For the sake of completeness, I have tried to explicitly assign a feature to a language version here. I could not find the associated standard/proposal for each feature but they do exist.
Standard (Draft v6)
C# language standard - ECMA-TC49-TG2
Unsafe blocks (ECMA Draftv6 22.2)
public void Method() {
unsafe {
// Unsafe operations
}
}Pointers & pointer fixture (ECMA Draftv6 22.7)
public unsafe void Method() {
fixed(int* ptr = &refVar) {
// Some cool pointer operations
}
}C# 9
Native Integer Primitives (CSharp 9.0 Proposal)
public void Method() {
nint myNativeInteger = -123;
nuint myNativeUnsignedInteger = 123;
}
public void Method(nint param1, nuint param2) {}Function pointers (CSharp 9.0 Proposal)
public void Method() {
delegate* managed<int, int>;
delegate* unmanaged<int, int>;
delegate* unmanaged[Cdecl] <int, int>;
delegate* unmanaged[Stdcall, SuppressGCTransition] <int, int>;
}Static anonymous functions (CSharp 9.0 Proposal)
public void X() {
Y(static (i) => i + 1);
Y(static i => i + 1);
}
public void Y(Func<int, int> x) {}With expressions (CSharp 9.0 Proposal)
public record MyRecord(string Name);
public MyRecord ModifyName(MyRecord rec) {
return rec with { Name = "My new name" };
}C# 10
Global Using Directives (CSharp 10.0 Proposal)
global using System;
global using System.Linq;
global using System.Runtime.CompilerServices;Records (CSharp 10.0 Proposal)
public partial record struct Record {}
public partial sealed record Record {}
public record struct Record {}
public sealed record Record {}Enhanced Pattern Matching (CSharp 9.0 Proposal + CSharp 10.0 Proposal)
void M(object o1, object o2)
{
var t = (o1, o2);
if (t is (int, string)) {}
switch (o1) {
case int: break;
case string: break;
}
}
bool IsLetter(char c) => c is (>= 'a' and <= 'z') or (>= 'A' and <= 'Z');Null checks
public void Method(object? nullable) {
if(nullable is null) {}
if(nullable is not null) {}
}Defaults
public void X() {
int x = default;
}implicit new
public void Method() {
MyKnownType value = new();
}Wrong implemented features
Extension method resolving
namespace N1
{
public static class D
{
public static void F(this int i) => Console.WriteLine($"D.F({i})");
}
}
namespace N2
{
using N1;
class Test
{
static void Main(string[] args)
{
1.F();
// ^^ Why is this red?
}
}
}