nil check

lib.go

@@ -130,6 +130,10 @@ func FunctionParams(v reflect.Value) []string {
 
 // Type returns the docuemntation for a package level type.
 func Type(t reflect.Type) string {
+	if t == nil {
+		return ""
+	}
+
 	t = unpack(t)
 	p := fmt.Sprintf("%s.%s", t.PkgPath(), t.Name())
 	return Docs(p)
@@ -141,6 +145,29 @@ func structField(visited map[reflect.Type]bool, t reflect.Type, fieldPath []stri
 		return nil, "", false
 	}
 
+	name := fieldPath[0]
+	for i := 0; i < t.NumField(); i++ {
+		f := t.Field(i)
+		if f.Anonymous || f.Name != name {
+			continue
+		}
+
+		if len(fieldPath) == 1 {
+			return t, name, true
+		}
+
+		tt, s, ok := structField(nil, unpack(f.Type), fieldPath[1:])
+		if !ok {
+			return nil, "", false
+		}
+
+		if tt.Name() == "" {
+			return t, fmt.Sprintf("%s.%s", name, s), true
+		}
+
+		return tt, s, true
+	}
+
 	for i := 0; i < t.NumField(); i++ {
 		f := t.Field(i)
 		if !f.Anonymous {
@@ -162,34 +189,15 @@ func structField(visited map[reflect.Type]bool, t reflect.Type, fieldPath []stri
 		}
 	}
 
-	name := fieldPath[0]
-	for i := 0; i < t.NumField(); i++ {
-		f := t.Field(i)
-		if f.Name != name {
-			continue
-		}
-
-		if len(fieldPath) == 1 {
-			return t, name, true
-		}
-
-		tt, s, ok := structField(nil, unpack(f.Type), fieldPath[1:])
-		if !ok {
-			return nil, "", false
-		}
-
-		if tt.Name() == "" {
-			return t, fmt.Sprintf("%s.%s", name, s), true
-		}
-
-		return tt, s, true
-	}
-
 	return nil, "", false
 }
 
 // Field returns the docuemntation for a struct field.
 func Field(t reflect.Type, fieldPath ...string) string {
+	if t == nil {
+		return ""
+	}
+
 	if len(fieldPath) == 0 {
 		return ""
 	}
@@ -204,6 +212,10 @@ func Field(t reflect.Type, fieldPath ...string) string {
 
 // Method returns the documentation for a type method.
 func Method(t reflect.Type, name string) string {
+	if t == nil {
+		return ""
+	}
+
 	t = unpack(t)
 	if t.Kind() != reflect.Struct {
 		return ""
@@ -215,11 +227,11 @@ func Method(t reflect.Type, name string) string {
 
 // MethodParams returns the list of the parameter names of a type method.
 func MethodParams(t reflect.Type, name string) []string {
-	t = unpack(t)
-	if t.Kind() != reflect.Struct {
+	if t == nil {
 		return nil
 	}
 
+	t = unpack(t)
 	p := fmt.Sprintf("%s.%s.%s", t.PkgPath(), t.Name(), name)
 	d := docs(p)
 	return functionParams(d)