64 lines
1.6 KiB
Go
64 lines
1.6 KiB
Go
package structure
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import "reflect"
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// Field represents a single struct field that encapsulates high level
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// functions around the field.
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type Field struct {
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value reflect.Value
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field reflect.StructField
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}
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// Tag returns the value associated with key in the tag string. If there is no
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// such key in the tag, Tag returns the empty string.
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func (f *Field) Tag(key string) string {
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return f.field.Tag.Get(key)
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}
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// Value returns the underlying value of of the field. It panics if the field
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// is not exported.
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func (f *Field) Value() interface{} {
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return f.value.Interface()
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}
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// IsEmbedded returns true if the given field is an anonymous field (embedded)
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func (f *Field) IsEmbedded() bool {
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return f.field.Anonymous
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}
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// IsExported returns true if the given field is exported.
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func (f *Field) IsExported() bool {
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return f.field.PkgPath == ""
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}
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// IsZero returns true if the given field is not initalized (has a zero value).
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// It panics if the field is not exported.
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func (f *Field) IsZero() bool {
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zero := reflect.Zero(f.value.Type()).Interface()
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current := f.Value()
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return reflect.DeepEqual(current, zero)
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}
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// Name returns the name of the given field
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func (f *Field) Name() string {
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return f.field.Name
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}
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// Field returns the field from a nested struct. It panics if the nested struct
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// is not exported or if the field was not found.
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func (f *Field) Field(name string) *Field {
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v := strctVal(f.value.Interface())
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t := v.Type()
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field, ok := t.FieldByName(name)
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if !ok {
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panic("field not found")
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}
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return &Field{
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field: field,
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value: v.FieldByName(name),
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}
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}
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