issue-103 - Parser fails when processing this library https://github.…

…com/golang/go

Return immediately after we find the list is empty.

parser/class_parser.go

@@ -263,6 +263,10 @@ func (p *ClassParser) parseFileDeclarations(node ast.Decl) {
 func (p *ClassParser) handleFuncDecl(decl *ast.FuncDecl) {
 
 	if decl.Recv != nil {
+		if decl.Recv.List == nil {
+			return
+		}
+
 		// Only get in when the function is defined for a structure. Global functions are not needed for class diagram
 		theType, _ := getFieldType(decl.Recv.List[0].Type, p.allImports)
 		theType = replacePackageConstant(theType, "")

parser/class_parser_test.go

@@ -988,3 +988,15 @@ func TestGenerateRenamedStructName(t *testing.T) {
 		t.Errorf("TestGenerateRenamedStructName: Expected result to be abcd, got %s", generatedName)
 	}
 }
+
+func TestClassParser_handleFuncDecl(t *testing.T) {
+	p := &ClassParser{}
+	p.handleFuncDecl(&ast.FuncDecl{
+		Recv: &ast.FieldList{
+			List: nil,
+		},
+	})
+	if len(p.allStructs) != 0 {
+		t.Error("expecting no structs to be created")
+	}
+}