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|
package format
import (
"reflect"
"unsafe"
)
type Stringer interface{ String() string }
var (
// stringer type for implement checks.
stringerType = typeof[Stringer]()
// error type for implement checks.
errorType = typeof[error]()
)
// getMethodType returns a *possible* FormatFunc to handle case
// of a type that implements any known interface{} types, else nil.
func getMethodType(t typenode) FormatFunc {
switch {
case t.rtype.Implements(stringerType):
switch t.rtype.Kind() {
case reflect.Interface:
return getInterfaceStringerType(t)
default:
return getConcreteStringerType(t)
}
case t.rtype.Implements(errorType):
switch t.rtype.Kind() {
case reflect.Interface:
return getInterfaceErrorType(t)
default:
return getConcreteErrorType(t)
}
default:
return nil
}
}
// getInterfaceStringerType returns a FormatFunc to handle case of an interface{}
// type that implements Stringer{}, i.e. Stringer{} itself and any superset of.
func getInterfaceStringerType(t typenode) FormatFunc {
switch t.indirect() && !t.iface_indir() {
case true:
return with_typestr_ptrs(t, func(s *State) {
s.P = *(*unsafe.Pointer)(s.P)
if s.P == nil || (*reflect_nonEmptyInterface)(s.P).word == nil {
appendNil(s)
return
}
v := *(*Stringer)(s.P)
appendString(s, v.String())
})
case false:
return with_typestr_ptrs(t, func(s *State) {
if s.P == nil || (*reflect_nonEmptyInterface)(s.P).word == nil {
appendNil(s)
return
}
v := *(*Stringer)(s.P)
appendString(s, v.String())
})
default:
panic("unreachable")
}
}
// getConcreteStringerType returns a FormatFunc to handle case of concrete
// (i.e. non-interface{}) type that has a Stringer{} method receiver.
func getConcreteStringerType(t typenode) FormatFunc {
itab := get_iface_ITab[Stringer](t.rtype)
switch t.indirect() && !t.iface_indir() {
case true:
return with_typestr_ptrs(t, func(s *State) {
s.P = *(*unsafe.Pointer)(s.P)
if s.P == nil {
appendNil(s)
return
}
v := *(*Stringer)(pack_iface(itab, s.P))
appendString(s, v.String())
})
case false:
return with_typestr_ptrs(t, func(s *State) {
if s.P == nil {
appendNil(s)
return
}
v := *(*Stringer)(pack_iface(itab, s.P))
appendString(s, v.String())
})
default:
panic("unreachable")
}
}
// getInterfaceErrorType returns a FormatFunc to handle case of an interface{}
// type that implements error{}, i.e. error{} itself and any superset of.
func getInterfaceErrorType(t typenode) FormatFunc {
switch t.indirect() && !t.iface_indir() {
case true:
return with_typestr_ptrs(t, func(s *State) {
s.P = *(*unsafe.Pointer)(s.P)
if s.P == nil || (*reflect_nonEmptyInterface)(s.P).word == nil {
appendNil(s)
return
}
v := *(*error)(s.P)
appendString(s, v.Error())
})
case false:
return with_typestr_ptrs(t, func(s *State) {
if s.P == nil || (*reflect_nonEmptyInterface)(s.P).word == nil {
appendNil(s)
return
}
v := *(*error)(s.P)
appendString(s, v.Error())
})
default:
panic("unreachable")
}
}
// getConcreteErrorType returns a FormatFunc to handle case of concrete
// (i.e. non-interface{}) type that has an error{} method receiver.
func getConcreteErrorType(t typenode) FormatFunc {
itab := get_iface_ITab[error](t.rtype)
switch t.indirect() && !t.iface_indir() {
case true:
return with_typestr_ptrs(t, func(s *State) {
s.P = *(*unsafe.Pointer)(s.P)
if s.P == nil {
appendNil(s)
return
}
v := *(*error)(pack_iface(itab, s.P))
appendString(s, v.Error())
})
case false:
return with_typestr_ptrs(t, func(s *State) {
if s.P == nil {
appendNil(s)
return
}
v := *(*error)(pack_iface(itab, s.P))
appendString(s, v.Error())
})
default:
panic("unreachable")
}
}
|
