Method encode

internal/encoding/json/encode.go:744–781

(e *encodeState, v reflect.Value, opts encOpts)

}

func (se structEncoder) encode(e *encodeState, v reflect.Value, opts encOpts) {
	next := byte('{')
FieldLoop:
	for i := range se.fields.list {
		f := &se.fields.list[i]

		// Find the nested struct field by following f.index.
		fv := v
		for _, i := range f.index {
			if fv.Kind() == reflect.Pointer {
				if fv.IsNil() {
					continue FieldLoop
				}
				fv = fv.Elem()
			}
			fv = fv.Field(i)
		}

		if (f.omitEmpty && isEmptyValue(fv)) ||
			(f.omitZero && (f.isZero == nil && fv.IsZero() || (f.isZero != nil && f.isZero(fv)))) {
			continue
		}
		e.WriteByte(next)
		next = ','
		if opts.escapeHTML {
			e.WriteString(f.nameEscHTML)
		} else {
			e.WriteString(f.nameNonEsc)
		}
		opts.quoted = f.quoted
		f.encoder(e, fv, opts)
	}
	if next == '{' {
		e.WriteString("{}")
	} else {
		e.WriteByte('}')
	}
}

func newStructEncoder(t reflect.Type) encoderFunc {
	se := structEncoder{fields: cachedTypeFields(t)}