Implements generic recursion over AST nodes

src/ast.c

@@ -726,6 +726,165 @@ void PrintNode(Node *node, uint32_t tabCount)
     }
 }
 
+void Recurse(Node *node, void (*func)(Node*))
+{
+    uint32_t i;
+    switch (node->syntaxKind)
+    {
+    case AccessExpression:
+        func(node->accessExpression.accessee);
+        func(node->accessExpression.accessor);
+        return;
+
+    case AllocExpression:
+        func(node->allocExpression.type);
+        return;
+
+    case Assignment:
+        func(node->assignmentStatement.left);
+        func(node->assignmentStatement.right);
+        return;
+
+    case BinaryExpression:
+        func(node->binaryExpression.left);
+        func(node->binaryExpression.right);
+        return;
+
+    case Comment:
+        return;
+
+    case CustomTypeNode:
+        return;
+
+    case Declaration:
+        func(node->declaration.type);
+        func(node->declaration.identifier);
+        return;
+
+    case DeclarationSequence:
+        for (i = 0; i < node->declarationSequence.count; i += 1) {
+            func(node->declarationSequence.sequence[i]);
+        }
+        return;
+
+    case ForLoop:
+        func(node->forLoop.declaration);
+        func(node->forLoop.startNumber);
+        func(node->forLoop.endNumber);
+        func(node->forLoop.statementSequence);
+        return;
+
+    case FunctionArgumentSequence:
+        for (i = 0; i < node->functionArgumentSequence.count; i += 1) {
+            func(node->functionArgumentSequence.sequence[i]);
+        }
+        return;
+
+    case FunctionCallExpression:
+        func(node->functionCallExpression.identifier);
+        func(node->functionCallExpression.argumentSequence);
+        return;
+
+    case FunctionDeclaration:
+        func(node->functionDeclaration.functionSignature);
+        func(node->functionDeclaration.functionBody);
+        return;
+
+    case FunctionModifiers:
+        for (i = 0; i < node->functionModifiers.count; i += 1) {
+            func(node->functionModifiers.sequence[i]);
+        }
+        return;
+
+    case FunctionSignature:
+        func(node->functionSignature.identifier);
+        func(node->functionSignature.type);
+        func(node->functionSignature.arguments);
+        func(node->functionSignature.modifiers);
+        func(node->functionSignature.genericArguments);
+        return;
+
+    case FunctionSignatureArguments:
+        for (i = 0; i < node->functionSignatureArguments.count; i += 1) {
+            func(node->functionSignatureArguments.sequence[i]);
+        }
+        return;
+
+    case GenericArgument:
+        func(node->genericArgument.identifier);
+        func(node->genericArgument.constraint);
+        return;
+
+    case GenericArguments:
+        for (i = 0; i < node->genericArguments.count; i += 1) {
+            func(node->genericArguments.arguments[i]);
+        }
+        return;
+
+    case GenericTypeNode:
+        return;
+
+    case Identifier:
+        return;
+
+    case IfStatement:
+        func(node->ifStatement.expression);
+        func(node->ifStatement.statementSequence);
+        return;
+
+    case IfElseStatement:
+        func(node->ifElseStatement.ifStatement);
+        func(node->ifElseStatement.elseStatement);
+        return;
+
+    case Number:
+        return;
+
+    case PrimitiveTypeNode:
+        return;
+
+    case ReferenceTypeNode:
+        func(node->referenceType.type);
+        return;
+
+    case Return:
+        func(node->returnStatement.expression);
+        return;
+
+    case ReturnVoid:
+        return;
+
+    case StatementSequence:
+        for (i = 0; i < node->statementSequence.count; i += 1) {
+            func(node->statementSequence.sequence[i]);
+        }
+        return;
+
+    case StaticModifier:
+        return;
+
+    case StringLiteral:
+        return;
+
+    case StructDeclaration:
+        func(node->structDeclaration.identifier);
+        func(node->structDeclaration.declarationSequence);
+        return;
+
+    case Type:
+        return;
+
+    case UnaryExpression:
+        func(node->unaryExpression.child);
+        return;
+
+    default:
+        fprintf(stderr, "wraith: Unhandled SyntaxKind %s in recurse function.\n", 
+                SyntaxKindString(node->syntaxKind));
+        return;
+    }
+}
+
 TypeTag *MakeTypeTag(Node *node)
 {
     if (node == NULL)

src/ast.h

@@ -367,6 +367,12 @@ Node *MakeForLoopNode(
 void PrintNode(Node *node, uint32_t tabCount);
 const char *SyntaxKindString(SyntaxKind syntaxKind);
 
+/* Helper function for applying a void function generically over the children of an AST node. 
+ * Used for functions that need to traverse the entire tree but only perform operations on a subset
+ * of node types. Such functions can match the syntaxKinds relevant to their purpose and invoke this
+ * function in all other cases. */
+void Recurse(Node *node, void (*func)(Node*));
+
 TypeTag *MakeTypeTag(Node *node);
 char *TypeTagToString(TypeTag *tag);
 

src/typeutils.c

@@ -51,33 +51,10 @@ void ConvertIdCustomsToGenerics(IdNode *node) {
 
 void ConvertASTCustomsToGenerics(Node *node) {
     uint32_t i;
-    switch (node->syntaxKind) {
-        case AccessExpression:
-            ConvertASTCustomsToGenerics(node->accessExpression.accessee);
-            ConvertASTCustomsToGenerics(node->accessExpression.accessor);
-            return;
-
-        case AllocExpression:
-            ConvertASTCustomsToGenerics(node->allocExpression.type);
-            return;
-
-        case Assignment:
-            ConvertASTCustomsToGenerics(node->assignmentStatement.left);
-            ConvertASTCustomsToGenerics(node->assignmentStatement.right);
-            return;
-
-        case BinaryExpression:
-            ConvertASTCustomsToGenerics(node->binaryExpression.left);
-            ConvertASTCustomsToGenerics(node->binaryExpression.right);
-            return;
-
-        case Comment: 
-            return;
-
-        case CustomTypeNode: 
-            return;
-
-        case Declaration: {
+    switch (node->syntaxKind)
+    {
+    case Declaration:
+    {
         Node *type = node->declaration.type->type.typeNode;
         Node *id = node->declaration.identifier;
         if (id->typeTag->type == Generic && type->syntaxKind == CustomTypeNode) {
@@ -87,39 +64,8 @@ void ConvertASTCustomsToGenerics(Node *node) {
         return;
     }
 
-        case DeclarationSequence:
-            for (i = 0; i < node->declarationSequence.count; i += 1) {
-                ConvertASTCustomsToGenerics(node->declarationSequence.sequence[i]);
-            }
-            return;
-
-        case ForLoop:
-            ConvertASTCustomsToGenerics(node->forLoop.declaration);
-            ConvertASTCustomsToGenerics(node->forLoop.startNumber);
-            ConvertASTCustomsToGenerics(node->forLoop.endNumber);
-            ConvertASTCustomsToGenerics(node->forLoop.statementSequence);
-            return;
-
-        case FunctionArgumentSequence:
-            for (i = 0; i < node->functionArgumentSequence.count; i += 1) {
-                ConvertASTCustomsToGenerics(node->functionArgumentSequence.sequence[i]);
-            }
-            return;
-
-        case FunctionCallExpression:
-            ConvertASTCustomsToGenerics(node->functionCallExpression.identifier);
-            ConvertASTCustomsToGenerics(node->functionCallExpression.argumentSequence);
-            return;
-
-        case FunctionDeclaration:
-            ConvertASTCustomsToGenerics(node->functionDeclaration.functionSignature);
-            ConvertASTCustomsToGenerics(node->functionDeclaration.functionBody);
-            return;
-            
-        case FunctionModifiers:
-            return;
-
-        case FunctionSignature:{
+    case FunctionSignature:
+    {
         Node *id = node->functionSignature.identifier;
         Node *type = node->functionSignature.type;
         if (id->typeTag->type == Generic && type->syntaxKind == CustomTypeNode) {
@@ -130,73 +76,7 @@ void ConvertASTCustomsToGenerics(Node *node) {
         return;
     }
 
-        case FunctionSignatureArguments:
-            for (i = 0; i < node->functionSignatureArguments.count; i += 1) {
-                ConvertASTCustomsToGenerics(node->functionSignatureArguments.sequence[i]);
-            }
-            return;
-
-        case GenericArgument:
-            return;
-
-        case GenericArguments: 
-            return;
-
-        case GenericTypeNode: 
-            return;
-
-        case Identifier: 
-            return;
-
-        case IfStatement:
-            ConvertASTCustomsToGenerics(node->ifStatement.expression);
-            ConvertASTCustomsToGenerics(node->ifStatement.statementSequence);
-            return;
-
-        case IfElseStatement: 
-            ConvertASTCustomsToGenerics(node->ifElseStatement.ifStatement);
-            ConvertASTCustomsToGenerics(node->ifElseStatement.elseStatement);
-            return;
-
-        case Number:
-            return;
-
-        case PrimitiveTypeNode:
-            return;
-
-        case ReferenceTypeNode:
-            return;
-
-        case Return: 
-            ConvertASTCustomsToGenerics(node->returnStatement.expression);
-            return;
-
-        case ReturnVoid: 
-            return;
-
-        case StatementSequence:
-            for (i = 0; i < node->statementSequence.count; i += 1) {
-                ConvertASTCustomsToGenerics(node->statementSequence.sequence[i]);
-            }
-            return;
-
-        case StaticModifier:
-            return;
-
-        case StringLiteral:
-            return;
-
-        case StructDeclaration:
-            /* FIXME: This case will need to be modified to handle type parameters over structs. */
-            ConvertASTCustomsToGenerics(node->structDeclaration.identifier);
-            ConvertASTCustomsToGenerics(node->structDeclaration.declarationSequence);
-            return;
-
-        case Type: 
-            return;
-
-        case UnaryExpression:
-            ConvertASTCustomsToGenerics(node->unaryExpression.child);
-            return;
+    default:
+        recurse(node, *ConvertASTCustomsToGenerics);
     }
 }