Split FunctionParameterSyntax and related types

FunctionParameterSyntax was used in a number of cases (function parameter, closure parameter and enum case parameter) and because it needs to satisfy all of them all its parameters are optional. Split it into three different types that have non-optional children.

rdar://106874808

Author: ahoppen

CodeGeneration/Sources/SyntaxSupport/DeclNodes.swift

@@ -428,6 +428,82 @@ public let DECL_NODES: [Node] = [
     ]
   ),
 
+  Node(
+    name: "EnumCaseParameterClause",
+    nameForDiagnostics: "parameter clause",
+    kind: "Syntax",
+    traits: [
+      "Parenthesized"
+    ],
+    children: [
+      Child(
+        name: "LeftParen",
+        kind: .token(choices: [.token(tokenKind: "LeftParenToken")])
+      ),
+      Child(
+        name: "ParameterList",
+        kind: .collection(kind: "EnumCaseParameterList", collectionElementName: "Parameter"),
+        nameForDiagnostics: "parameters",
+        isIndented: true
+      ),
+      Child(
+        name: "RightParen",
+        kind: .token(choices: [.token(tokenKind: "RightParenToken")])
+      ),
+    ]
+  ),
+
+  Node(
+    name: "EnumCaseParameterList",
+    nameForDiagnostics: "parameter list",
+    kind: "SyntaxCollection",
+    element: "EnumCaseParameter"
+  ),
+
+  Node(
+    name: "EnumCaseParameter",
+    nameForDiagnostics: "parameter",
+    kind: "Syntax",
+    traits: [
+      "WithTrailingComma"
+    ],
+    parserFunction: "parseEnumCaseParameter",
+    children: [
+      Child(
+        name: "Modifiers",
+        kind: .collection(kind: "ModifierList", collectionElementName: "Modifier"),
+        nameForDiagnostics: "modifiers",
+        isOptional: true
+      ),
+      Child(
+        name: "FirstName",
+        kind: .token(choices: [.token(tokenKind: "IdentifierToken"), .token(tokenKind: "WildcardToken")]),
+        isOptional: true
+      ),
+      Child(
+        name: "Colon",
+        kind: .token(choices: [.token(tokenKind: "ColonToken")]),
+        isOptional: true
+      ),
+      Child(
+        name: "Type",
+        kind: .node(kind: "Type"),
+        nameForDiagnostics: "type"
+      ),
+      Child(
+        name: "DefaultArgument",
+        kind: .node(kind: "InitializerClause"),
+        nameForDiagnostics: "default argument",
+        isOptional: true
+      ),
+      Child(
+        name: "TrailingComma",
+        kind: .token(choices: [.token(tokenKind: "CommaToken")]),
+        isOptional: true
+      ),
+    ]
+  ),
+
   Node(
     name: "EnumCaseDecl",
     nameForDiagnostics: "enum case",
@@ -489,7 +565,7 @@ public let DECL_NODES: [Node] = [
       ),
       Child(
         name: "AssociatedValue",
-        kind: .node(kind: "ParameterClause"),
+        kind: .node(kind: "EnumCaseParameterClause"),
         nameForDiagnostics: "associated values",
         description: "The set of associated values of the case.",
         isOptional: true
@@ -699,6 +775,7 @@ public let DECL_NODES: [Node] = [
       "WithTrailingComma",
       "Attributed",
     ],
+    parserFunction: "parseFunctionParameter",
     children: [
       Child(
         name: "Attributes",
@@ -714,8 +791,7 @@ public let DECL_NODES: [Node] = [
       ),
       Child(
         name: "FirstName",
-        kind: .token(choices: [.token(tokenKind: "IdentifierToken"), .token(tokenKind: "WildcardToken")]),
-        isOptional: true
+        kind: .token(choices: [.token(tokenKind: "IdentifierToken"), .token(tokenKind: "WildcardToken")])
       ),
       // One of these two names needs be optional, we choose the second
       // name to avoid backtracking.
@@ -727,14 +803,12 @@ public let DECL_NODES: [Node] = [
       ),
       Child(
         name: "Colon",
-        kind: .token(choices: [.token(tokenKind: "ColonToken")]),
-        isOptional: true
+        kind: .token(choices: [.token(tokenKind: "ColonToken")])
       ),
       Child(
         name: "Type",
         kind: .node(kind: "Type"),
-        nameForDiagnostics: "type",
-        isOptional: true
+        nameForDiagnostics: "type"
       ),
       Child(
         name: "Ellipsis",

CodeGeneration/Sources/SyntaxSupport/ExprNodes.swift

@@ -301,6 +301,81 @@ public let EXPR_NODES: [Node] = [
     ]
   ),
 
+  Node(
+    name: "ClosureParameter",
+    nameForDiagnostics: "parameter",
+    kind: "Syntax",
+    traits: [
+      "WithTrailingComma"
+    ],
+    parserFunction: "parseClosureParameter",
+    children: [
+      Child(
+        name: "Modifiers",
+        kind: .collection(kind: "ModifierList", collectionElementName: "Modifier"),
+        nameForDiagnostics: "modifiers",
+        isOptional: true
+      ),
+      Child(
+        name: "FirstName",
+        kind: .token(choices: [.token(tokenKind: "IdentifierToken"), .token(tokenKind: "WildcardToken")])
+      ),
+      Child(
+        name: "Colon",
+        kind: .token(choices: [.token(tokenKind: "ColonToken")]),
+        isOptional: true
+      ),
+      Child(
+        name: "Type",
+        kind: .node(kind: "Type"),
+        nameForDiagnostics: "type",
+        isOptional: true
+      ),
+      Child(
+        name: "Ellipsis",
+        kind: .token(choices: [.token(tokenKind: "EllipsisToken")]),
+        isOptional: true
+      ),
+      Child(
+        name: "TrailingComma",
+        kind: .token(choices: [.token(tokenKind: "CommaToken")]),
+        isOptional: true
+      ),
+    ]
+  ),
+
+  Node(
+    name: "ClosureParameterList",
+    nameForDiagnostics: "parameter list",
+    kind: "SyntaxCollection",
+    element: "ClosureParameter"
+  ),
+
+  Node(
+    name: "ClosureParameterClause",
+    nameForDiagnostics: "parameter clause",
+    kind: "Syntax",
+    traits: [
+      "Parenthesized"
+    ],
+    children: [
+      Child(
+        name: "LeftParen",
+        kind: .token(choices: [.token(tokenKind: "LeftParenToken")])
+      ),
+      Child(
+        name: "ParameterList",
+        kind: .collection(kind: "ClosureParameterList", collectionElementName: "Parameter"),
+        nameForDiagnostics: "parameters",
+        isIndented: true
+      ),
+      Child(
+        name: "RightParen",
+        kind: .token(choices: [.token(tokenKind: "RightParenToken")])
+      ),
+    ]
+  ),
+
   Node(
     name: "ClosureExpr",
     nameForDiagnostics: "closure",
@@ -389,7 +464,7 @@ public let EXPR_NODES: [Node] = [
           ),
           Child(
             name: "Input",
-            kind: .node(kind: "ParameterClause")
+            kind: .node(kind: "ClosureParameterClause")
           ),
         ]),
         isOptional: true

Sources/SwiftBasicFormat/generated/BasicFormat.swift

@@ -99,12 +99,16 @@ open class BasicFormat: SyntaxRewriter {
       return true
     case \ClosureExprSyntax.statements:
       return true
+    case \ClosureParameterClauseSyntax.parameterList:
+      return true
     case \CodeBlockSyntax.statements:
       return true
     case \DictionaryElementSyntax.valueExpression:
       return true
     case \DictionaryExprSyntax.content:
       return true
+    case \EnumCaseParameterClauseSyntax.parameterList:
+      return true
     case \FunctionCallExprSyntax.argumentList:
       return true
     case \FunctionTypeSyntax.arguments: