Don’t highlight generic parameter types used in initializer declarati…

…ons (#107)

This change makes Splash stop highlighting generic types that are attached
to an initializer declaration, and instead now only highlights their
constraints, just like within other kinds of generic type lists.

Sources/Splash/Grammar/SwiftGrammar.swift

@@ -87,7 +87,7 @@ private extension SwiftGrammar {
     static let declarationKeywords: Set<String> = [
         "class", "struct", "enum", "func",
         "protocol", "typealias", "import",
-        "associatedtype", "subscript"
+        "associatedtype", "subscript", "init"
     ]
 
     struct PreprocessingRule: SyntaxRule {

Tests/SplashTests/Tests/DeclarationTests.swift

@@ -1106,6 +1106,35 @@ final class DeclarationTests: SyntaxHighlighterTestCase {
         ])
     }
 
+    func testGenericInitializerDeclaration() {
+        let components = highlighter.highlight("""
+        struct Box {
+            init<T: Model>(model: T) {}
+        }
+        """)
+
+        XCTAssertEqual(components, [
+            .token("struct", .keyword),
+            .whitespace(" "),
+            .plainText("Box"),
+            .whitespace(" "),
+            .plainText("{"),
+            .whitespace("\n    "),
+            .token("init", .keyword),
+            .plainText("<T:"),
+            .whitespace(" "),
+            .token("Model", .type),
+            .plainText(">(model:"),
+            .whitespace(" "),
+            .token("T", .type),
+            .plainText(")"),
+            .whitespace(" "),
+            .plainText("{}"),
+            .whitespace("\n"),
+            .plainText("}")
+        ])
+    }
+
     func testAllTestsRunOnLinux() {
         XCTAssertTrue(TestCaseVerifier.verifyLinuxTests((type(of: self)).allTests))
     }
@@ -1157,7 +1186,8 @@ extension DeclarationTests {
             ("testPrefixFunctionDeclaration", testPrefixFunctionDeclaration),
             ("testEnumDeclarationWithSomeCase", testEnumDeclarationWithSomeCase),
             ("testIndirectEnumDeclaration", testIndirectEnumDeclaration),
-            ("testWrappedPropertyDeclarations", testWrappedPropertyDeclarations)
+            ("testWrappedPropertyDeclarations", testWrappedPropertyDeclarations),
+            ("testGenericInitializerDeclaration", testGenericInitializerDeclaration)
         ]
     }
 }