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Copy pathencode.go
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139 lines (130 loc) · 4.04 KB
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package gocsv
import (
"fmt"
"io"
"reflect"
)
typeencoderstruct {
out io.Writer
}
funcnewEncoder(out io.Writer) *encoder {
return&encoder{out}
}
funcwriteFromChan(writer*SafeCSVWriter, c<-chaninterface{}) error {
// Get the first value. It wil determine the header structure.
firstValue, ok:=<-c
if!ok {
returnfmt.Errorf("channel is closed")
}
inValue, inType:=getConcreteReflectValueAndType(firstValue) // Get the concrete type
iferr:=ensureStructOrPtr(inType); err!=nil {
returnerr
}
inInnerWasPointer:=inType.Kind() ==reflect.Ptr
inInnerStructInfo:=getStructInfo(inType) // Get the inner struct info to get CSV annotations
csvHeadersLabels:=make([]string, len(inInnerStructInfo.Fields))
fori, fieldInfo:=rangeinInnerStructInfo.Fields { // Used to write the header (first line) in CSV
csvHeadersLabels[i] =fieldInfo.getFirstKey()
}
iferr:=writer.Write(csvHeadersLabels); err!=nil {
returnerr
}
write:=func(val reflect.Value) error {
forj, fieldInfo:=rangeinInnerStructInfo.Fields {
csvHeadersLabels[j] =""
inInnerFieldValue, err:=getInnerField(val, inInnerWasPointer, fieldInfo.IndexChain) // Get the correct field header <-> position
iferr!=nil {
returnerr
}
csvHeadersLabels[j] =inInnerFieldValue
}
iferr:=writer.Write(csvHeadersLabels); err!=nil {
returnerr
}
returnnil
}
iferr:=write(inValue); err!=nil {
returnerr
}
forv:=rangec {
val, _:=getConcreteReflectValueAndType(v) // Get the concrete type (not pointer) (Slice<?> or Array<?>)
iferr:=ensureStructOrPtr(inType); err!=nil {
returnerr
}
iferr:=write(val); err!=nil {
returnerr
}
}
writer.Flush()
returnwriter.Error()
}
funcwriteTo(writer*SafeCSVWriter, ininterface{}, omitHeadersbool) error {
inValue, inType:=getConcreteReflectValueAndType(in) // Get the concrete type (not pointer) (Slice<?> or Array<?>)
iferr:=ensureInType(inType); err!=nil {
returnerr
}
inInnerWasPointer, inInnerType:=getConcreteContainerInnerType(inType) // Get the concrete inner type (not pointer) (Container<"?">)
iferr:=ensureInInnerType(inInnerType); err!=nil {
returnerr
}
inInnerStructInfo:=getStructInfo(inInnerType) // Get the inner struct info to get CSV annotations
csvHeadersLabels:=make([]string, len(inInnerStructInfo.Fields))
fori, fieldInfo:=rangeinInnerStructInfo.Fields { // Used to write the header (first line) in CSV
csvHeadersLabels[i] =fieldInfo.getFirstKey()
}
if!omitHeaders {
iferr:=writer.Write(csvHeadersLabels); err!=nil {
returnerr
}
}
inLen:=inValue.Len()
fori:=0; i<inLen; i++ { // Iterate over container rows
forj, fieldInfo:=rangeinInnerStructInfo.Fields {
csvHeadersLabels[j] =""
inInnerFieldValue, err:=getInnerField(inValue.Index(i), inInnerWasPointer, fieldInfo.IndexChain) // Get the correct field header <-> position
iferr!=nil {
returnerr
}
csvHeadersLabels[j] =inInnerFieldValue
}
iferr:=writer.Write(csvHeadersLabels); err!=nil {
returnerr
}
}
writer.Flush()
returnwriter.Error()
}
funcensureStructOrPtr(t reflect.Type) error {
switcht.Kind() {
casereflect.Struct:
fallthrough
casereflect.Ptr:
returnnil
}
returnfmt.Errorf("cannot use "+t.String() +", only slice or array supported")
}
// Check if the inType is an array or a slice
funcensureInType(outType reflect.Type) error {
switchoutType.Kind() {
casereflect.Slice:
fallthrough
casereflect.Array:
returnnil
}
returnfmt.Errorf("cannot use "+outType.String() +", only slice or array supported")
}
// Check if the inInnerType is of type struct
funcensureInInnerType(outInnerType reflect.Type) error {
switchoutInnerType.Kind() {
casereflect.Struct:
returnnil
}
returnfmt.Errorf("cannot use "+outInnerType.String() +", only struct supported")
}
funcgetInnerField(outInner reflect.Value, outInnerWasPointerbool, index []int) (string, error) {
oi:=outInner
ifoutInnerWasPointer {
oi=outInner.Elem()
}
returngetFieldAsString(oi.FieldByIndex(index))
}