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internal/lib/reflect: impl Value.Field

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visualfc
2024-11-13 20:17:41 +08:00
parent e6de8401bf
commit 1f757270d9
1 changed files with 9 additions and 4 deletions
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13
internal/lib/reflect/value.go
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@@ -517,7 +517,6 @@ func ifaceIndir(typ *abi.Type) bool {
// Field returns the i'th field of the struct v. // Field returns the i'th field of the struct v.
// It panics if v's Kind is not Struct or i is out of range. // It panics if v's Kind is not Struct or i is out of range.
func (v Value) Field(i int) Value { func (v Value) Field(i int) Value {
/* TODO(xsw):
if v.kind() != Struct { if v.kind() != Struct {
panic(&ValueError{"reflect.Value.Field", v.kind()}) panic(&ValueError{"reflect.Value.Field", v.kind()})
} }
@@ -531,7 +530,7 @@ func (v Value) Field(i int) Value {
// Inherit permission bits from v, but clear flagEmbedRO. // Inherit permission bits from v, but clear flagEmbedRO.
fl := v.flag&(flagStickyRO|flagIndir|flagAddr) | flag(typ.Kind()) fl := v.flag&(flagStickyRO|flagIndir|flagAddr) | flag(typ.Kind())
// Using an unexported field forces flagRO. // Using an unexported field forces flagRO.
if !field.Name.IsExported() { if !field.Exported() {
if field.Embedded() { if field.Embedded() {
fl |= flagEmbedRO fl |= flagEmbedRO
} else { } else {
@@ -545,8 +544,6 @@ func (v Value) Field(i int) Value {
// so v.ptr + field.offset is still the correct address. // so v.ptr + field.offset is still the correct address.
ptr := add(v.ptr, field.Offset, "same as non-reflect &v.field") ptr := add(v.ptr, field.Offset, "same as non-reflect &v.field")
return Value{typ, ptr, fl} return Value{typ, ptr, fl}
*/
panic("todo: reflect.Value.Field")
} }
// FieldByIndex returns the nested field corresponding to index. // FieldByIndex returns the nested field corresponding to index.
@@ -2014,6 +2011,14 @@ func (v Value) MethodByName(name string) Value {
return v.Method(m.Index) return v.Method(m.Index)
} }
// NumField returns the number of fields in the struct v.
// It panics if v's Kind is not Struct.
func (v Value) NumField() int {
v.mustBe(Struct)
tt := (*structType)(unsafe.Pointer(v.typ()))
return len(tt.Fields)
}
// Call calls the function v with the input arguments in. // Call calls the function v with the input arguments in.
// For example, if len(in) == 3, v.Call(in) represents the Go call v(in[0], in[1], in[2]). // For example, if len(in) == 3, v.Call(in) represents the Go call v(in[0], in[1], in[2]).
// Call panics if v's Kind is not Func. // Call panics if v's Kind is not Func.