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package arg
import (
"encoding"
"reflect"
"unicode"
"unicode/utf8"
scalar "github.com/alexflint/go-scalar"
)
var textUnmarshalerType = reflect.TypeOf([]encoding.TextUnmarshaler{}).Elem()
// canParse returns true if the type can be parsed from a string
func canParse(t reflect.Type) (parseable, boolean, multiple bool) {
parseable = scalar.CanParse(t)
boolean = isBoolean(t)
if parseable {
return
}
// Look inside pointer types
if t.Kind() == reflect.Ptr {
t = t.Elem()
}
// Look inside slice types
if t.Kind() == reflect.Slice {
multiple = true
t = t.Elem()
}
parseable = scalar.CanParse(t)
boolean = isBoolean(t)
if parseable {
return
}
// Look inside pointer types (again, in case of []*Type)
if t.Kind() == reflect.Ptr {
t = t.Elem()
}
parseable = scalar.CanParse(t)
boolean = isBoolean(t)
if parseable {
return
}
return false, false, false
}
// isBoolean returns true if the type can be parsed from a single string
func isBoolean(t reflect.Type) bool {
switch {
case t.Implements(textUnmarshalerType):
return false
case t.Kind() == reflect.Bool:
return true
case t.Kind() == reflect.Ptr && t.Elem().Kind() == reflect.Bool:
return true
default:
return false
}
}
// isExported returns true if the struct field name is exported
func isExported(field string) bool {
r, _ := utf8.DecodeRuneInString(field) // returns RuneError for empty string or invalid UTF8
return unicode.IsLetter(r) && unicode.IsUpper(r)
}
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