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package conf
import "reflect"
type Tag struct {
Type reflect.Type
Method bool
Ambiguous bool
}
type TypesTable map[string]Tag
// CreateTypesTable creates types table for type checks during parsing.
// If struct is passed, all fields will be treated as variables,
// as well as all fields of embedded structs and struct itself.
//
// If map is passed, all items will be treated as variables
// (key as name, value as type).
func CreateTypesTable(i interface{}) TypesTable {
if i == nil {
return nil
}
types := make(TypesTable)
v := reflect.ValueOf(i)
t := reflect.TypeOf(i)
d := t
if t.Kind() == reflect.Ptr {
d = t.Elem()
}
switch d.Kind() {
case reflect.Struct:
types = FieldsFromStruct(d)
// Methods of struct should be gathered from original struct with pointer,
// as methods maybe declared on pointer receiver. Also this method retrieves
// all embedded structs methods as well, no need to recursion.
for i := 0; i < t.NumMethod(); i++ {
m := t.Method(i)
types[m.Name] = Tag{Type: m.Type, Method: true}
}
case reflect.Map:
for _, key := range v.MapKeys() {
value := v.MapIndex(key)
if key.Kind() == reflect.String && value.IsValid() && value.CanInterface() {
types[key.String()] = Tag{Type: reflect.TypeOf(value.Interface())}
}
}
// A map may have method too.
for i := 0; i < t.NumMethod(); i++ {
m := t.Method(i)
types[m.Name] = Tag{Type: m.Type, Method: true}
}
}
return types
}
func FieldsFromStruct(t reflect.Type) TypesTable {
types := make(TypesTable)
t = dereference(t)
if t == nil {
return types
}
switch t.Kind() {
case reflect.Struct:
for i := 0; i < t.NumField(); i++ {
f := t.Field(i)
if f.Anonymous {
for name, typ := range FieldsFromStruct(f.Type) {
if _, ok := types[name]; ok {
types[name] = Tag{Ambiguous: true}
} else {
types[name] = typ
}
}
}
types[f.Name] = Tag{Type: f.Type}
}
}
return types
}
func dereference(t reflect.Type) reflect.Type {
if t == nil {
return nil
}
if t.Kind() == reflect.Ptr {
t = dereference(t.Elem())
}
return t
}
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