Improvements to C# operator and punctuation (#1532)

Solve the issue of [C# breaking ligature fonts with the `=>` operator](#1133 (comment)). `=>` is now an operator.

There are also some other changes.

1. `?` and `:` are now all included by `punctuation`.
    Because `:` cannot be included in `operator` (because it is also used for inheritance)
the `?` shouldn't be an `operator` either.
2.  `??` and `?.` were added to `punctuation`.
    They weren't explicitly supported before.
3. An operator-test was added.

components/prism-csharp.js

@@ -43,7 +43,9 @@ Prism.languages.csharp = Prism.languages.extend('clike', {
 			}
 		}
 	],
-	'number': /\b0x[\da-f]+\b|(?:\b\d+\.?\d*|\B\.\d+)f?/i
+	'number': /\b0x[\da-f]+\b|(?:\b\d+\.?\d*|\B\.\d+)f?/i,
+	'operator': />>=?|<<=?|[-=]>|([-+&|?])\1|~|[-+*/%&|^!=<>]=?/,
+	'punctuation': /\?\.?|::|[{}[\];(),.:]/
 });
 
 Prism.languages.insertBefore('csharp', 'class-name', {
@@ -76,4 +78,4 @@ Prism.languages.insertBefore('csharp', 'class-name', {
 	}
 });
 
-Prism.languages.dotnet = Prism.languages.csharp;
+Prism.languages.dotnet = Prism.languages.csharp;

tests/languages/csharp/issue1371.test

@@ -48,8 +48,7 @@ class Works : LandAnimal {
 	["class-name", ["Container"]],
 	["punctuation", "("],
 	"f ",
-	["operator", "="],
-	["operator", ">"],
+	["operator", "=>"],
 	["punctuation", "{"],
 	"\r\n    f",
 	["punctuation", "."],
@@ -82,8 +81,7 @@ class Works : LandAnimal {
 	["function", "Move"],
 	["punctuation", "("],
 	["punctuation", ")"],
-	["operator", "="],
-	["operator", ">"],
+	["operator", "=>"],
 	["function", "Run"],
 	["punctuation", "("],
 	["punctuation", ")"],
@@ -100,8 +98,7 @@ class Works : LandAnimal {
 	["function", "Move"],
 	["punctuation", "("],
 	["punctuation", ")"],
-	["operator", "="],
-	["operator", ">"],
+	["operator", "=>"],
 	["function", "Run"],
 	["punctuation", "("],
 	["punctuation", ")"],
@@ -118,8 +115,7 @@ class Works : LandAnimal {
 	["function", "Move"],
 	["punctuation", "("],
 	["punctuation", ")"],
-	["operator", "="],
-	["operator", ">"],
+	["operator", "=>"],
 	["function", "Run"],
 	["punctuation", "("],
 	["punctuation", ")"],

tests/languages/csharp/operator_feature.test

@@ -0,0 +1,60 @@
++ - * / % -- ++
+>> <<
+~ & | ^
++= -= *= /= %= >>= <<= &= |= ^=
+! && ||
+-> =>
+= == != < > <= >=
+??
+
+----------------------------------------------------
+
+[
+	["operator", "+"],
+	["operator", "-"],
+	["operator", "*"],
+	["operator", "/"],
+	["operator", "%"],
+	["operator", "--"],
+	["operator", "++"],
+
+	["operator", ">>"],
+	["operator", "<<"],
+
+	["operator", "~"],
+	["operator", "&"],
+	["operator", "|"],
+	["operator", "^"],
+
+	["operator", "+="],
+	["operator", "-="],
+	["operator", "*="],
+	["operator", "/="],
+	["operator", "%="],
+	["operator", ">>="],
+	["operator", "<<="],
+	["operator", "&="],
+	["operator", "|="],
+	["operator", "^="],
+
+	["operator", "!"],
+	["operator", "&&"],
+	["operator", "||"],
+
+	["operator", "->"],
+	["operator", "=>"],
+
+	["operator", "="],
+	["operator", "=="],
+	["operator", "!="],
+	["operator", "<"],
+	["operator", ">"],
+	["operator", "<="],
+	["operator", ">="],
+
+	["operator", "??"]
+]
+
+----------------------------------------------------
+
+Checks for all operators.

tests/languages/csharp/punctuation_feature.test

@@ -0,0 +1,27 @@
+. , ; : ::
+? ?.
+[ ] { } ( )
+
+----------------------------------------------------
+
+[
+	["punctuation", "."],
+	["punctuation", ","],
+	["punctuation", ";"],
+	["punctuation", ":"],
+	["punctuation", "::"],
+
+	["punctuation", "?"],
+	["punctuation", "?."],
+
+	["punctuation", "["],
+	["punctuation", "]"],
+	["punctuation", "{"],
+	["punctuation", "}"],
+	["punctuation", "("],
+	["punctuation", ")"]
+]
+
+----------------------------------------------------
+
+Checks for punctuation.