continue adding Handler logic; remove unused TxQueue tests

lneto2/validation.go

@@ -0,0 +1,64 @@
+package lneto2
+
+import (
+	"errors"
+	"fmt"
+)
+
+type Validator struct {
+	checkEvil      bool
+	allowMultiErrs bool
+	accum          []error
+	accumBitpos    []BitPosErr
+}
+
+func (v *Validator) ResetErr() {
+	v.accum = v.accum[:0]
+	v.accumBitpos = v.accumBitpos[:0]
+}
+
+func (v *Validator) HasError() bool {
+	return len(v.accum) != 0
+}
+
+func (v *Validator) Err() error {
+	if len(v.accum) == 1 {
+		return v.accum[0]
+	} else if len(v.accum) == 0 {
+		return nil
+	}
+	return errors.Join(v.accum...)
+}
+
+func (v *Validator) gotErr(err error) {
+	v.accum = append(v.accum, err)
+}
+
+func (v *Validator) AddError(err error) {
+	if err == nil {
+		panic("error argument to AddError cannot be nil")
+	} else if len(v.accum) != 0 && !v.allowMultiErrs {
+		return
+	}
+	v.accum = append(v.accum, err)
+}
+
+func (v *Validator) AddBitPosErr(bitStart, bitLen int, err error) {
+	if err == nil {
+		panic("err argument to bitPosErr cannot be nil")
+	} else if bitLen <= 0 {
+		panic("")
+	}
+	v.accumBitpos = append(v.accumBitpos, BitPosErr{BitStart: bitStart, BitLen: bitLen, Err: err})
+	v.accum = append(v.accum, &v.accumBitpos[len(v.accumBitpos)-1])
+}
+
+type BitPosErr struct {
+	BitStart int
+	BitLen   int
+	Err      error
+}
+
+func (bpe *BitPosErr) Error() string {
+	return fmt.Sprintf("%s at bits %d..%d", bpe.Err.Error(), bpe.BitStart, bpe.BitStart+bpe.BitLen)
+}