func()

in internal/encoding/json/encode.go [778:821]

• 39 lines of code
• 8 McCabe index (conditional complexity)

func (me mapEncoder) encode(e *encodeState, v reflect.Value, opts encOpts) {
	if v.IsNil() {
		e.WriteString("null")
		return
	}
	if e.ptrLevel++; e.ptrLevel > startDetectingCyclesAfter {
		// We're a large number of nested ptrEncoder.encode calls deep;
		// start checking if we've run into a pointer cycle.
		ptr := v.UnsafePointer()
		if _, ok := e.ptrSeen[ptr]; ok {
			e.error(&UnsupportedValueError{v, fmt.Sprintf("encountered a cycle via %s", v.Type())})
		}
		e.ptrSeen[ptr] = struct{}{}
		defer delete(e.ptrSeen, ptr)
	}
	e.WriteByte('{')

	// Extract and sort the keys.
	var (
		sv  = make([]reflectWithString, v.Len())
		mi  = v.MapRange()
		err error
	)
	for i := 0; mi.Next(); i++ {
		if sv[i].ks, err = resolveKeyName(mi.Key()); err != nil {
			e.error(fmt.Errorf("json: encoding error for type %q: %q", v.Type().String(), err.Error()))
		}
		sv[i].v = mi.Value()
	}
	slices.SortFunc(sv, func(i, j reflectWithString) int {
		return strings.Compare(i.ks, j.ks)
	})

	for i, kv := range sv {
		if i > 0 {
			e.WriteByte(',')
		}
		e.Write(appendString(e.AvailableBuffer(), kv.ks, opts.escapeHTML))
		e.WriteByte(':')
		me.elemEnc(e, kv.v, opts)
	}
	e.WriteByte('}')
	e.ptrLevel--
}