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ftor.go
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package evendeep
// ftor.go - functors
//
import (
"reflect"
"strconv"
"strings"
"unsafe"
"gopkg.in/hedzr/errors.v3"
"github.com/hedzr/evendeep/dbglog"
"github.com/hedzr/evendeep/flags/cms"
"github.com/hedzr/evendeep/internal/cl"
"github.com/hedzr/evendeep/internal/tool"
"github.com/hedzr/evendeep/ref"
"github.com/hedzr/evendeep/typ"
"github.com/hedzr/is"
"github.com/hedzr/is/term/color"
logz "github.com/hedzr/logg/slog"
)
func copyPointer(c *cpController, params *Params, from, to reflect.Value) (err error) {
// from is a pointer
fromType := from.Type()
if fromType == to.Type() {
if params.isFlagExists(cms.Flat) {
to.Set(from)
return
}
}
src := ref.Rindirect(from)
tgt := ref.Rindirect(to)
paramsChild := newParams(withOwners(c, params, &from, &to, nil, nil))
defer paramsChild.revoke()
//nolint:lll //keep it
if tgt.CanSet() {
if src.IsValid() {
err = c.copyTo(paramsChild, src, to)
} else if paramsChild.isGroupedFlagOKDeeply(cms.ClearIfInvalid) {
// pointer - src is nil - set tgt to nil too
newtyp := to.Type()
zv := reflect.Zero(newtyp)
dbglog.Log(" pointer - zv: %v (%v), to: %v (%v)", ref.Valfmt(&zv), ref.Typfmt(newtyp), ref.Valfmt(&to), ref.Typfmtv(&to))
to.Set(zv)
// err = newobj(c, params, src, to, tgt)
}
} else {
dbglog.Log(" pointer - tgt is invalid/cannot-be-set/ignored: src: (%v) -> tgt: (%v)", ref.Typfmtv(&src), ref.Typfmtv(&to))
err = newObj(c, paramsChild, fromType, src, to, tgt)
}
return
}
func newObj(c *cpController, params *Params, fromType reflect.Type, src, to, tgt reflect.Value) (err error) {
newtyp := to.Type()
if to.Type() == fromType {
newtyp = newtyp.Elem() // is pointer and its same
}
// create new object and pointer
toobjcopyptrv := reflect.New(newtyp)
dbglog.Log(" toobjcopyptrv: %v", ref.Typfmtv(&toobjcopyptrv))
if err = c.copyTo(params, src, toobjcopyptrv.Elem()); err == nil {
val := toobjcopyptrv
if to.Type() == fromType {
val = val.Elem()
}
err = setTargetValue1(params.owner, to, tgt, val)
// to.Set(toobjcopyptrv)
}
return
}
func copyInterface(c *cpController, params *Params, from, to reflect.Value) (err error) { //nolint:revive
if ref.IsNil(from) {
if params.isGroupedFlagOKDeeply(cms.OmitIfNil, cms.OmitIfEmpty) {
return
}
if to.CanSet() {
to.Set(reflect.Zero(to.Type()))
return
} else if to.Kind() == reflect.Ptr {
if to.Elem().CanSet() {
to.Elem().Set(reflect.Zero(to.Elem().Type()))
return
}
}
goto badReturn
}
if ref.IsZero(from) {
if params.isGroupedFlagOKDeeply(cms.OmitIfZero, cms.OmitIfEmpty) {
return
}
if to.CanSet() {
to.Set(reflect.Zero(to.Type()))
return
} else if to.Kind() == reflect.Ptr {
if to.Elem().CanSet() {
to.Elem().Set(reflect.Zero(to.Elem().Type()))
return
}
}
goto badReturn
}
err = copyInterfaceImpl(c, params, from, to)
return
badReturn:
err = ErrCannotSet.FormatWith(ref.Valfmt(&from), ref.Typfmtv(&from), ref.Valfmt(&to), ref.Typfmtv(&to))
return
}
func copyInterfaceImpl(c *cpController, params *Params, from, to reflect.Value) (err error) {
paramsChild := newParams(withOwners(c, params, &from, &to, nil, nil))
defer paramsChild.revoke()
// unbox the interface{} to original data type
toind, toptr := ref.Rdecode(to) // c.skip(to, reflect.Interface, reflect.Pointer)
dbglog.Log("from.type: %v, decode to: %v", from.Type().Kind(), paramsChild.srcDecoded.Kind())
dbglog.Log(" to.type: %v, decode to: %v (ptr: %v) | CanSet: %v/%v, CanAddr: %v",
to.Type().Kind(), toind.Kind(), toptr.Kind(), toind.CanSet(), toptr.CanSet(), toind.CanAddr())
if !ref.KindIs(toind.Kind(), reflect.Map, reflect.Slice, reflect.Chan) {
if !toind.CanSet() && !toptr.CanSet() {
// logz.Panicf("[copyInterface] toind.CanSet() is false!")
// valid ptr pointed to an invalid source object,
// valid ptr pointed to an invalid target object:
//nolint:lll //keep it
err = errors.New("[copyInterface] target pointer cannot be set, toind.Kind: %v, toptr.Kind: %v", toind.Kind(), toptr.Kind())
return
}
}
// var merging = c.flags.isAnyFlagsOK(SliceMerge, MapMerge) || params.isAnyFlagsOK(SliceMerge, MapMerge)
if !c.makeNewClone || paramsChild.inMergeMode() {
err = c.copyTo(paramsChild, *paramsChild.srcDecoded, toptr)
return
}
if to.CanSet() {
copyValue := reflect.New(paramsChild.srcDecoded.Type()).Elem()
if err = c.copyTo(paramsChild, *paramsChild.srcDecoded, copyValue); err == nil {
to.Set(copyValue)
}
}
return
}
func copyStruct(c *cpController, params *Params, from, to reflect.Value) (err error) {
// default is cms.ByOrdinal:
// loops all source fields and copy its value to the corresponding target field.
cb := forEachSourceField
if c.targetOriented || params.isGroupedFlagOKDeeply(cms.ByName) {
// cmd.ByName strategy:
// loops all target fields and try copying value from source field by its name.
cb = forEachTargetField
}
err = copyStructInternal(c, params, from, to, cb)
return
}
func copyStructInternal( //nolint:revive,gocognit //keep it
c *cpController, params *Params,
from, to reflect.Value,
fn func(paramsChild *Params, ec errors.Error, i, amount *int, padding string) (err error),
) (err error) {
var (
i, amount int
padding string
ec = errors.New("copyStructInternal errors")
paramsChild = newParams(withOwners(c, params, &from, &to, nil, nil))
)
defer func() {
if e := recover(); e != nil {
sst, _ := paramsChild.targetIterator.(sourceStructFieldsTable) //nolint:revive,errcheck //no need
ff := sst.TableRecord(i).FieldValue()
tf := paramsChild.dstOwner
tft := ¶msChild.dstType
if paramsChild.accessor != nil {
tf = paramsChild.accessor.FieldValue()
tft = paramsChild.accessor.FieldType()
}
// .WithData(e) will collect e if it's an error object else store it simply
ec.Attach(errors.New("[recovered] copyStruct unsatisfied ([%v] -> [%v]), causes: %v",
ref.Typfmtv(ff), ref.Typfmtptr(tft), e).
WithMaxObjectStringLength(maxObjectStringLen).
WithData(e).
WithTaggedData(errors.TaggedData{ // record the sites
"source-field": ff,
"target-field": tf,
"source": ref.Valfmt(ff),
"target": ref.Valfmt(tf),
}))
// n := logz.CalcStackFrames(1) // skip defer-recover frame at first
// logz.Skip(n).Errorf("%v", err) // skip golib frames and defer-recover frame, back to the point throwing panic
// if c.rethrow {
// logz.Panicf("%+v", ec)
// } else {
// dbglog.Err("copyStructInternal will return error: %+v", ec)
// }
}
ec.Defer(&err)
paramsChild.revoke()
if err != nil {
dbglog.Err("copyStructInternal will return error: %+v", err)
}
}()
if dbglog.LogValid {
// dbgFrontOfStruct(params, paramsChild, padding, func(msg string, args ...interface{}) { dbglog.Log(msg, args...) })
dbgFrontOfStruct(paramsChild, padding, dbglog.Log)
}
var processed bool
if processed, err = tryConverters(c, paramsChild, &from, paramsChild.dstDecoded, ¶msChild.dstType, true); processed { //nolint:lll //keep it
return
}
switch k := paramsChild.dstDecoded.Kind(); k { //nolint:exhaustive //no need
case reflect.Slice:
dbglog.Log(" * struct -> slice case, ...")
if paramsChild.dstDecoded.Len() > 0 { //nolint:gocritic // no need to switch to 'switch' clause
err = c.copyTo(paramsChild, *paramsChild.srcOwner, paramsChild.dstDecoded.Index(0))
} else if paramsChild.isGroupedFlagOKDeeply(cms.SliceCopyAppend, cms.SliceMerge) {
err = cpStructToNewSliceElem0(paramsChild)
} else {
err = ErrCannotCopy.FormatWith(ref.Valfmt(&from), ref.Typfmtv(&from), ref.Valfmt(&to), ref.Typfmtv(&to))
}
ec.Attach(err)
return
case reflect.Array:
dbglog.Log(" * struct -> array case, ...")
if paramsChild.dstDecoded.Len() > 0 {
err = c.copyTo(paramsChild, *paramsChild.srcOwner, paramsChild.dstDecoded.Index(0))
} else {
err = ErrCannotCopy.FormatWith(ref.Valfmt(&from), ref.Typfmtv(&from), ref.Valfmt(&to), ref.Typfmtv(&to))
}
ec.Attach(err)
return
case reflect.String:
dbglog.Log(" * struct -> string case, ...")
var str string
if str, err = doMarshalling(*paramsChild.srcOwner); err == nil {
target := reflect.ValueOf(str)
if paramsChild.dstDecoded.CanSet() {
paramsChild.dstDecoded.Set(target)
} else {
err = ErrCannotSet.FormatWith(
ref.Valfmt(paramsChild.srcDecoded),
ref.Typfmtv(paramsChild.srcDecoded),
ref.Valfmt(paramsChild.dstDecoded),
ref.Typfmtv(paramsChild.dstDecoded))
}
}
return
}
err = fn(paramsChild, ec, &i, &amount, padding)
ec.Attach(err)
return
}
func cpStructToNewSliceElem0(params *Params) (err error) {
eltyp := params.dstType.Elem()
et, _ := ref.Rdecodetype(eltyp)
elnew := reflect.New(et)
slice, tgtptr, el := *params.dstDecoded, params.dstOwner, elnew.Elem()
if eltyp != et {
tgtptr, el = params.dstOwner, elnew
}
if err = params.controller.copyTo(params, *params.srcOwner, elnew); err == nil {
result := reflect.Append(slice, el)
if tk := tgtptr.Kind(); tk == reflect.Slice || tk == reflect.Interface {
tgtptr.Set(result)
} else {
tgtptr.Elem().Set(result)
}
}
return
}
func getSourceFieldName(knownDestName string, params *Params) (srcFieldName string, flagsInTag *fieldTags, ignored bool) { //nolint:revive,lll
srcFieldName = knownDestName
// var flagsInTag *fieldTags
var ok bool
if sf := params.accessor.StructField(); sf != nil { //nolint:nestif //keep it
flagsInTag, ignored = params.parseFieldTags(sf.Tag)
if ignored {
return
}
srcFieldName, ok = flagsInTag.CalcSourceName(sf.Name)
// dbglog.Log(" srcName: %v, ok: %v [pre 1, fld: %v, tag: %v]", srcFieldName, ok, sf.Name, sf.Tag)
if !ok {
if tr := params.accessor.SourceField(); tr != nil {
if sf = tr.structField; sf != nil {
flagsInTag, ignored = params.parseFieldTags(sf.Tag)
if ignored {
return
}
srcFieldName, ok = flagsInTag.CalcSourceName(sf.Name)
// dbglog.Log(" srcName: %v, ok: %v [pre 2, fld: %v, tag: %v]", srcFieldName, ok, sf.Name, sf.Tag)
}
}
}
}
dbglog.Log(" srcName: %v, ok: %v | dstName: %v", srcFieldName, ok, knownDestName)
return
}
// func getTargetFieldName(knownSrcName string, params *Params) (dstFieldName string, ignored bool) {
// dstFieldName = knownSrcName
// var flagsInTag *fieldTags
// var ok bool
// if sf := params.accessor.StructField(); sf != nil {
// flagsInTag, ignored = params.parseFieldTags(sf.Tag)
// if ignored {
// return
// }
// ctx := &NameConverterContext{Params: params}
// dstFieldName, ok = flagsInTag.CalcTargetName(sf.Name, ctx)
// if !ok {
// if tr := params.accessor.SourceField(); tr != nil {
// if sf = tr.structField; sf != nil {
// flagsInTag, ignored = params.parseFieldTags(sf.Tag)
// if ignored {
// return
// }
// dstFieldName, ok = flagsInTag.CalcTargetName(sf.Name, ctx)
// dbglog.Log(" dstName: %v, ok: %v [pre 2, fld: %v, tag: %v]", dstFieldName, ok, sf.Name, sf.Tag)
// }
// }
// }
// }
// return
// }
// forEachTargetField works for cms.ByName mode enabled.
func forEachTargetField(params *Params, ec errors.Error, i, amount *int, padding string) (err error) { //nolint:revive
c := params.controller
sst, ok := params.targetIterator.(sourceStructFieldsTable)
_ = ok
var val reflect.Value
fcz := params.isGroupedFlagOKDeeply(cms.ClearIfMissed)
aun := c.autoNewStruct // autoNew mode:
cfrtt := c.copyFunctionResultToTarget
// We will do new(field) for each target field if it's invalid.
//
// It's not cms.ClearIfInvalid - which will detect if the source
// field is invalid or not, but target one.
//
//nolint:lll //keep it
dbglog.Log(" c.autoNewStruct = %v, c.copyFunctionResultToTarget = %v, cms.ClearIfMissed is set: %v", aun, cfrtt, fcz)
for *i, *amount = 0, len(sst.TableRecords()); params.nextTargetFieldLite(); *i++ {
name := params.accessor.StructFieldName() // get target field name
if params.shouldBeIgnored(name) {
continue
}
if extractor := c.sourceExtractor; extractor != nil { //nolint:nestif //keep it
v := extractor(name)
val = reflect.ValueOf(v)
params.accessor.Set(val)
continue
}
srcFieldName, _, ignored := getSourceFieldName(name, params)
if ignored {
dbglog.Log(` > source field ignored (flag found in struct tag): %v.`, srcFieldName)
continue
}
ind := sst.RecordByName(srcFieldName)
switch {
case ind != nil:
val = *ind
case cfrtt:
if _, ind = sst.MethodCallByName(srcFieldName); ind != nil {
val = *ind
} else if _, ind = sst.MethodCallByName(name); ind != nil {
val = *ind
} else {
continue // skip the field
}
case fcz || (aun && !params.accessor.ValueValid()):
tt := params.accessor.FieldType()
val = reflect.Zero(*tt)
dbglog.Log(" target is invalid: %v, autoNewStruct: %v", params.accessor.ValueValid(), aun)
default:
continue
}
params.accessor.Set(val)
}
return
}
func forEachSourceField(params *Params, ec errors.Error, i, amount *int, padding string) (err error) { //nolint:revive
sst, _ := params.targetIterator.(sourceStructFieldsTable) //nolint:revive,errcheck //no need
c := params.controller
for *i, *amount = 0, len(sst.TableRecords()); *i < *amount; *i++ {
if params.sourceFieldShouldBeIgnored() {
dbglog.Log("%d. %s : IGNORED", *i, sst.CurrRecord().FieldName())
if c.advanceTargetFieldPointerEvenIfSourceIgnored {
_ = params.nextTargetFieldLite()
} else {
sst.Step(1) // step the source field index subscription
}
continue
}
var goon bool
if goon, err = forEachSourceFieldCheckTargetSetter(params, sst); goon {
continue
}
var sourceField *tableRecT
if sourceField, goon = params.nextTargetField(); !goon {
continue
}
fn, srcval, dstval := sourceField.FieldName(), sourceField.FieldValue(), params.accessor.FieldValue()
dstfieldname := params.accessor.StructFieldName()
// log.VDebugf will be tuned and stripped off in normal build.
dbglog.Colored(color.FgLightMagenta, "%d. fld %q (%v) -> %s (%v) | (%v) -> (%v)", *i,
fn, ref.Typfmtv(srcval), dstfieldname, ref.Typfmt(*params.accessor.FieldType()),
ref.Valfmt(srcval), ref.Valfmt(dstval))
// The following if clause will be stripped off completely
// in normal build.
// It's only available when using `-tags=verbose`.
// The first condition 'logz.VerboseEnabled' do circuit to
// be optimized by compiler.
if is.VerboseModeEnabled() && !ec.IsEmpty() {
logz.Warn(" ERR-CONTAINER NOT EMPTY:", "error", ec.Error())
}
if srcval != nil && dstval != nil {
typ1 := params.accessor.FieldType() // target type
if typ1 != nil && !ref.KindIs((*typ1).Kind(), reflect.Chan, reflect.Func, reflect.Interface, reflect.UnsafePointer, reflect.Ptr, reflect.Slice) {
if ref.IsNil(*dstval) || !dstval.IsValid() {
if !ref.IsNil(*srcval) {
dbglog.Log(" create new: dstval = nil/invalid, type: %v (%v -> nil/inalid)", ref.Typfmt(*typ1), ref.Valfmt(srcval))
_, elem := newFromTypeEspSlice(*typ1)
dstval.Set(elem)
dbglog.Log(" create new: dstval created: %v", ref.Typfmtv(dstval))
}
}
}
if srcval.IsValid() {
if err = invokeStructFieldTransformer(c, params, srcval, dstval, typ1, padding); err != nil {
ec.Attach(err)
dbglog.Err(" %d. fld %q error: %v", *i, fn, err)
} else {
dbglog.Log(" %d. fld %q copied. from-to: %v -> %v", *i, fn, ref.Valfmt(srcval), ref.Valfmt(dstval))
}
}
continue
}
if goon = forEachSourceFieldCheckMergeMode(params, srcval, ec, padding); goon {
continue
}
dbglog.Wrn(" %d. fld %q: ignore nil/zero/invalid source or nil target", *i, fn)
}
return
}
func forEachSourceFieldCheckTargetSetter(params *Params, sst sourceStructFieldsTable) (goon bool, err error) {
c := params.controller
if c.targetSetter == nil {
return
}
currec := sst.CurrRecord()
srcval := currec.FieldValue()
if err = c.targetSetter(srcval, currec.names...); err == nil {
if c.advanceTargetFieldPointerEvenIfSourceIgnored {
_ = params.nextTargetFieldLite()
} else {
sst.Step(1) // step the source field index
}
goon = true
return // targetSetter make things done, so continue to next field
}
if err != ErrShouldFallback { //nolint:errorlint //want it exactly
return // has error, break the whole copier loop
}
err = nil // fallback
return
}
func forEachSourceFieldCheckMergeMode(params *Params, srcval *reflect.Value,
ec errors.Error, padding string,
) (goon bool) {
if params.inMergeMode() {
var err error
c := params.controller
typ1 := params.accessor.FieldType()
dbglog.Log(" new object for %v", ref.Typfmt(*typ1))
// create new object and pointer
toobjcopyptrv := reflect.New(*typ1).Elem()
dbglog.Log(" toobjcopyptrv: %v", ref.Typfmtv(&toobjcopyptrv))
//nolint:gocritic // no need to switch to 'switch' clause
if err = invokeStructFieldTransformer(c, params, srcval, &toobjcopyptrv, typ1, padding); err != nil {
ec.Attach(err)
dbglog.Err("error: %v", err)
} else if toobjcopyptrv.Kind() == reflect.Slice {
params.accessor.Set(toobjcopyptrv)
} else if toobjcopyptrv.Kind() == reflect.Ptr {
params.accessor.Set(toobjcopyptrv.Elem())
} else {
params.accessor.Set(toobjcopyptrv)
}
goon = true
}
return
}
func dbgFrontOfStruct(params *Params, padding string, logger func(msg string, args ...interface{})) { //nolint:revive
if is.VerboseModeEnabled() {
if params == nil {
return
}
if logger == nil {
logger = dbglog.Log //nolint:revive
}
d := params.depth()
if d > 1 {
d -= 2
}
padding1 := strings.Repeat(" ", d*2) //nolint:gomnd //no need
// fromT, toT := params.srcDecoded.Type(), params.dstDecoded.Type()
// Log(" %s %d, %d, %d", padding, params.index, params.srcOffset, params.dstOffset)
// fq := dbgMakeInfoString(fromT, params.owner, true, logger)
// dq := dbgMakeInfoString(toT, params.owner, false, logger)
logger(" %s- src (%v) -> dst (%v)", padding1, ref.Typfmtv(params.srcDecoded), ref.Typfmtv(params.dstDecoded))
// logger(" %s %s -> %s", padding, fq, dq)
_ = padding
}
}
func invokeStructFieldTransformer( //nolint:revive
c *cpController, params *Params, ff, df *reflect.Value,
dftyp *reflect.Type, //nolint:gocritic // ptrToRefParam: consider 'dftyp' to be of non-pointer type
padding string,
) (err error) {
fv, dv := ff != nil && ff.IsValid(), df != nil && df.IsValid()
fft, dft := dtypzz(ff, dftyp), dtypzz(df, dftyp)
fftk, dftk := fft.Kind(), dft.Kind()
_ = padding
var processed bool
if processed = checkClearIfEqualOpt(params, ff, df, dft); processed {
return
}
if processed = checkOmitEmptyOpt(params, ff, df, dft); processed {
return
}
if processed, err = tryConverters(c, params, ff, df, dftyp, false); processed {
return
}
if fftk == reflect.Struct && ff.NumField() == 0 {
// never get into here because tableRecordsT.getAllFields skip empty struct
logz.Warn("should never get into here, might be algor wrong ?")
}
if dftk == reflect.Struct && df.NumField() == 0 {
// structIterable.Next() might return an empty struct accessor
// rather than field.
dbglog.Err("shouldn't get into here because we have a failover branch at the callee")
}
if fv && dv {
dbglog.Log(` c.copyTo: ff -> df`)
err = c.copyTo(params, *ff, *df) // or, use internal standard implementation version
dbglog.Log(` c.copyTo.end: ff -> df. err = %v, df = %v`, err, ref.Valfmt(df))
if is.VerboseModeEnabled() {
if df.CanInterface() {
switch k := df.Kind(); k {
case reflect.Map, reflect.Slice:
var v typ.Any = df.Interface()
dbglog.Log(` c.copyTo.end: df = %v`, v)
}
}
}
return
}
return forInvalidValues(c, params, ff, fft, dft, fftk, dftk, fv)
}
func forInvalidValues(c *cpController, params *Params, ff *reflect.Value, fft, dft reflect.Type, fftk, dftk reflect.Kind, fv bool) (err error) { //nolint:revive,lll
if !fv {
dbglog.Log(" ff is invalid: %v", ref.Typfmtv(ff))
nv := reflect.New(fft).Elem()
ff = &nv //nolint:revive
}
if dftk == reflect.Interface {
dft, dftk = fft, fftk //nolint:revive
}
dbglog.Log(" dft: %v", ref.Typfmt(dft))
if dftk == reflect.Ptr {
nv := reflect.New(dft.Elem())
tt := nv.Elem()
dbglog.Log(" nv.tt: %v", ref.Typfmtv(&tt))
ff1 := ref.Rindirect(*ff)
err = c.copyTo(params, ff1, tt) // use user-defined copy-n-merger to merge or copy source to destination
if err == nil && !params.accessor.IsStruct() {
params.accessor.Set(tt)
}
} else {
nv := reflect.New(dft)
ff1 := ref.Rindirect(*ff)
err = c.copyTo(params, ff1, nv.Elem()) // use user-defined copy-n-merger to merge or copy source to destination
if err == nil && !params.accessor.IsStruct() {
params.accessor.Set(nv.Elem())
}
}
return
}
//nolint:lll //keep it
func dtypzz(df *reflect.Value, deftyp *reflect.Type) reflect.Type { //nolint:gocritic // ptrToRefParam: consider 'dftyp' to be of non-pointer type
if df != nil && df.IsValid() {
return df.Type()
}
return *deftyp
}
func checkOmitEmptyOpt(params *Params, ff, df *reflect.Value, dft reflect.Type) (processed bool) { //nolint:revive,unparam
if ref.IsNilv(ff) && params.isGroupedFlagOKDeeply(cms.OmitIfNil, cms.OmitIfEmpty) {
processed = true
}
if ref.IsZerov(ff) && params.isGroupedFlagOKDeeply(cms.OmitIfZero, cms.OmitIfEmpty) {
processed = true
}
_, _ = df, dft
return
}
func checkClearIfEqualOpt(params *Params, ff, df *reflect.Value, dft reflect.Type) (processed bool) {
if params.isFlagExists(cms.ClearIfEq) {
if tool.EqualClassical(*ff, *df) {
df.Set(reflect.Zero(dft))
} else if params.isFlagExists(cms.ClearIfInvalid) && !df.IsValid() {
df.Set(reflect.Zero(dft))
}
processed = true
if params.isFlagExists(cms.KeepIfNotEq) {
return
}
}
return
}
func tryConverters(c *cpController, params *Params,
ff, df *reflect.Value,
dftyp *reflect.Type, //nolint:gocritic // ptrToRefParam: consider 'dftyp' to be of non-pointer type
userDefinedOnly bool,
) (processed bool, err error) {
fft, dft := dtypzz(ff, dftyp), dtypzz(df, dftyp)
if c.tryApplyConverterAtFirst {
if processed, err = findAndApplyConverters(c, params, ff, df, fft, dft, userDefinedOnly); processed {
return
}
processed, err = findAndApplyCopiers(c, params, ff, df, fft, dft, userDefinedOnly)
} else {
if processed, err = findAndApplyCopiers(c, params, ff, df, fft, dft, userDefinedOnly); processed {
return
}
processed, err = findAndApplyConverters(c, params, ff, df, fft, dft, userDefinedOnly)
}
return
}
func findAndApplyCopiers(c *cpController, params *Params, ff, df *reflect.Value, fft, dft reflect.Type, userDefinedOnly bool) (processed bool, err error) { //nolint:revive,lll
if cvt, ctx := c.valueCopiers.findCopiers(params, fft, dft, userDefinedOnly); ctx != nil { //nolint:nestif //keep it
dbglog.Colored(color.FgDarkColor, "-> using Copier %v", reflect.ValueOf(cvt).Type())
if df.IsValid() {
if err = cvt.CopyTo(ctx, *safeFF(ff, fft), *df); err == nil { // use user-defined copy-n-merger to merge or copy source to destination
processed = true
}
return
}
if dft.Kind() == reflect.Interface {
dft = fft //nolint:revive
}
dbglog.Log(" dft: %v", ref.Typfmt(dft))
nv := reflect.New(dft)
err = cvt.CopyTo(ctx, *safeFF(ff, fft), nv) // use user-defined copy-n-merger to merge or copy source to destination
if err == nil && !params.accessor.IsStruct() {
params.accessor.Set(nv.Elem())
processed = true
}
}
return
}
func findAndApplyConverters(c *cpController, params *Params, ff, df *reflect.Value, fft, dft reflect.Type, userDefinedOnly bool) (processed bool, err error) { //nolint:revive,lll
if cvt, ctx := c.valueConverters.findConverters(params, fft, dft, userDefinedOnly); ctx != nil {
dbglog.Colored(color.FgDarkColor, "-> using Converter %v", reflect.ValueOf(cvt).Type())
var result reflect.Value
result, err = cvt.Transform(ctx, *safeFF(ff, fft), dft) // use user-defined value converter to transform from source to destination
if err == nil && !df.IsValid() && !params.accessor.IsStruct() {
params.accessor.Set(result)
processed = true
return
}
df.Set(result)
processed = true
}
return
}
func safeFF(ff *reflect.Value, fft reflect.Type) *reflect.Value {
if ff == nil {
tmpsrc := reflect.New(fft).Elem()
ff = &tmpsrc //nolint:revive
}
return ff
}
// copySlice transforms from slice to target with slice or other types.
func copySlice(c *cpController, params *Params, from, to reflect.Value) (err error) { //nolint:revive
if from.IsNil() && params.isGroupedFlagOKDeeply(cms.OmitIfNil, cms.OmitIfEmpty) { // an empty slice found
return
}
var tgt, tgtptr reflect.Value
tgt, tgtptr = ref.Rdecode(to)
if to != tgtptr { //nolint:govet //how should i do //TODO needs checked-review
err = c.copyTo(params, from, tgtptr) // unwrap the pointer
return
}
if !ref.KindIs(tgt.Kind(), reflect.Map, reflect.Slice, reflect.Chan) && !tgt.CanSet() {
logz.Panic("[copySlice] tgtptr cannot be set")
}
if params.controller != c {
logz.Panic("[copySlice] c *cpController != params.controller, what's up??")
}
tk, typ1 := tgt.Kind(), tgt.Type()
if tk != reflect.Slice {
dbglog.Log("[copySlice] from slice -> %v", ref.Typfmt(typ1))
var processed bool
if processed, err = tryConverters(c, params, &from, &tgt, &typ1, false); !processed {
// logz.Panicf("[copySlice] unsupported transforming: from slice -> %v,", typfmtv(&tgt))
//nolint:lll //keep it
err = ErrCannotCopy.WithErrors(err).FormatWith(ref.Valfmt(&from), ref.Typfmtv(&from), ref.Valfmt(&tgt), ref.Typfmtv(&tgt))
}
return
}
if ref.IsNil(tgt) && params.isGroupedFlagOKDeeply(cms.OmitIfTargetZero, cms.OmitIfTargetEmpty) {
return
}
params.resultForNewSlice, err = copySliceInternal(c, params, from, to, tgt, tgtptr)
return
}
func copySliceInternal(c *cpController, params *Params, from, to, tgt, tgtptr reflect.Value) (result *reflect.Value, err error) { //nolint:revive,lll
if from.Len() == 0 {
dbglog.Log(" slice copy ignored because src slice is empty.")
return
}
ec := errors.New("slice copy/merge errors")
defer ec.Defer(&err)
for _, flag := range []cms.CopyMergeStrategy{cms.SliceMerge, cms.SliceCopyAppend, cms.SliceCopy} {
if params.isGroupedFlagOKDeeply(flag) { //nolint:revive,nestif,gocritic,lll // nestingReduce: invert if cond, replace body with `continue`, move old body after the statement
dbglog.Log("Using slice merge mode: %v", flag)
dbglog.Log(" from.type: %v, value: %v", ref.Typfmtv(&from), ref.Valfmt(&from))
dbglog.Log(" to.type: %v, value: %v | canAddr: %v, canSet: %v", ref.Typfmtv(&to), ref.Valfmt(&to), to.CanAddr(), to.CanSet())
// Log(" src.type: %v, len: %v, cap: %v, srcptr.canAddr: %v", src.Type().Kind(), src.Len(), src.Cap(), srcptr.CanAddr())
dbglog.Log(" tgt.type: %v, tgtptr: %v .canAddr: %v", ref.Typfmtv(&tgt), ref.Typfmtv(&tgtptr), tgtptr.CanAddr())
if fn, ok := getSliceOperations()[flag]; ok {
if result, err = fn(c, params, from, tgt); err == nil {
dbglog.Log(" result: got %v (%v)", ref.Valfmt(result), ref.Typfmtv(result))
dbglog.Log(" tgt: contains %v (%v) | tgtptr: %v, .canset: %v", ref.Valfmt(&tgt), ref.Typfmtv(&tgt), ref.Typfmtv(&tgtptr), tgtptr.CanSet()) //nolint:revive,lll
if tk := tgtptr.Kind(); tk == reflect.Ptr { //nolint:gocritic //keep it
tgtptr.Elem().Set(*result)
} else if tk == reflect.Slice || tk == reflect.Interface {
// dbglog.Log(" TGT: %v", tool.Valfmt(&tgt))
if tgtptr.CanSet() { //nolint:revive
tgtptr.Set(*result) //nolint:revive
}
} else {
dbglog.Log(" error: cannot make copy for a slice, the target ptr is cannot be set: tgtptr.typ = %v", ref.Typfmtv(&tgtptr))
ec.Attach(errors.New("cannot make copy for a slice, the target ptr is cannot be set: tgtptr.typ = %v", ref.Typfmtv(&tgtptr)))
}
} else {
dbglog.Log(" error: ec.Attach(e), e: %v", err)
ec.Attach(err)
}
} else {
dbglog.Log(" error: cannot make copy for a slice, unknown copy-merge-strategy %v", flag)
ec.Attach(errors.New("cannot make copy for a slice, unknown copy-merge-strategy %v", flag))
}
break
}
}
return
}
// transferSlice never used
//
//nolint:unused //future
func transferSlice(src, tgt reflect.Value) reflect.Value {
i, sl, tl := 0, src.Len(), tgt.Len()
for ; i < sl && i < tl; i++ {
if i < tl {
if i >= sl {
tgt.SetLen(i)
break
}
tgt.Index(i).Set(src.Index(i))
}
}
if i < sl && i >= tl {
for ; i < sl; i++ {
tgt = reflect.Append(tgt, src.Index(i)) //nolint:revive
}
}
return tgt
}
type (
fnSliceOperator func(c *cpController, params *Params, src, tgt reflect.Value) (result *reflect.Value, err error)
mSliceOperations map[cms.CopyMergeStrategy]fnSliceOperator
)
func getSliceOperations() (mapOfSliceOperations mSliceOperations) {
mapOfSliceOperations = mSliceOperations{ //nolint:exhaustive //i have right
cms.SliceCopy: _sliceCopyOperation,
cms.SliceCopyAppend: _sliceCopyAppendOperation,
cms.SliceMerge: _sliceMergeOperation,
}
return
}
// _sliceCopyOperation: for SliceCopy, target elements will be given up, and source copied to.
func _sliceCopyOperation(c *cpController, params *Params, src, tgt reflect.Value) (result *reflect.Value, err error) {
slice := reflect.MakeSlice(tgt.Type(), 0, src.Len())
dbglog.Log("tgt slice: %v, el: %v", tgt.Type(), tgt.Type().Elem())
ecTotal := errors.New("slice merge errors (%v -> %v)", src.Type(), tgt.Type())
defer ecTotal.Defer(&err)
// if c.wipeSlice1st {
// // TODO c.wipeSlice1st
// }
for _, ss := range []struct {
length int
source reflect.Value
}{
// {tl, tgt},
{src.Len(), src},
} {
var one *reflect.Value
one, err = _sliceCopyOne(c, params, ecTotal, slice, ss.length, ss.source, tgt)
if one != nil && err == nil {
slice = *one
}
}
result = &slice
return
}
// _sliceCopyAppendOperation: for SliceCopyAppend, target and source elements will be copied to new target.
// The duplicated elements were kept.
//
//nolint:lll //keep it
func _sliceCopyAppendOperation(c *cpController, params *Params, src, tgt reflect.Value) (result *reflect.Value, err error) {
sl, tl := src.Len(), tgt.Len()
ns := reflect.MakeSlice(tgt.Type(), 0, 0)
dbglog.Log("tgt slice: %v, el: %v", tgt.Type(), tgt.Type().Elem())
ecTotal := errors.New("slice merge errors (%v -> %v)", src.Type(), tgt.Type())
defer ecTotal.Defer(&err)
for _, ss := range []struct {
length int
source reflect.Value
}{
{tl, tgt},
{sl, src},
} {
var one *reflect.Value
one, err = _sliceCopyOne(c, params, ecTotal, ns, ss.length, ss.source, tgt)
if one != nil && err == nil {
ns = *one
}
}
result = &ns
return
}
func _sliceCopyOne(c *cpController, params *Params, ecTotal errors.Error, slice reflect.Value, sslength int, sssource, tgt reflect.Value) (result *reflect.Value, err error) { //nolint:revive,lll
tgtelemtype := tgt.Type().Elem()
for i := 0; i < sslength; i++ {
var (
el = sssource.Index(i)
enew = el
)
// elv := el.Interface()
if el.Type() != tgtelemtype {
if cc, ctx := c.valueConverters.findConverters(params, el.Type(), tgtelemtype, false); cc != nil {
if enew, err = cc.Transform(ctx, el, tgtelemtype); err != nil {
ec := errors.New("cannot convert %v to %v", el.Type(), tgtelemtype)
ec.Attach(err)
ecTotal.Attach(ec)
continue // ignore invalid element
}
} else if ref.CanConvert(&el, tgtelemtype) {
enew = el.Convert(tgtelemtype)
// elv = enew.Interface()
}
}
if el.Type() == tgtelemtype { //nolint:nestif //keep it
slice = reflect.Append(slice, el) //nolint:revive
} else {
if ref.CanConvert(&el, tgtelemtype) {
slice = reflect.Append(slice, enew) //nolint:revive
} else {
enew = reflect.New(tgtelemtype)
e := c.copyTo(params, el, enew)
if e != nil {
ec := errors.New("cannot convert %v to %v", el.Type(), tgtelemtype)
ec.Attach(e)
ecTotal.Attach(ec)
} else {
slice = reflect.Append(slice, enew.Elem()) //nolint:revive
}
}
}
// ecTotal.Attach(ec)
}
result = &slice
return
}
// _sliceMergeOperation: for SliceMerge. target and source elements will be
// copied to new target with uniqueness.
func _sliceMergeOperation(c *cpController, params *Params, src, tgt reflect.Value) (result *reflect.Value, err error) { //nolint:revive
sl, tl := src.Len(), tgt.Len()
ns := reflect.MakeSlice(tgt.Type(), 0, 0)
tgtelemtype := tgt.Type().Elem()
dbglog.Log("tgt slice: %v, el: %v", tgt.Type(), tgtelemtype)
ecTotal := errors.New("slice merge errors (%v -> %v)", src.Type(), tgt.Type())
defer ecTotal.Defer(&err)
for _, ss := range []struct {
length int
source reflect.Value
}{
{tl, tgt},
{sl, src},
} {
for i := 0; i < ss.length; i++ {
// to.Set(reflect.Append(to, src.Index(i)))
var (
found bool
cvtok bool
el = ss.source.Index(i)
elt = el.Type()