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package transformers
import (
"container/list"
"fmt"
"os"
"strings"
"github.com/johnkerl/miller/v6/pkg/cli"
"github.com/johnkerl/miller/v6/pkg/mlrval"
"github.com/johnkerl/miller/v6/pkg/types"
)
// ----------------------------------------------------------------
const verbNameFillEmpty = "fill-empty"
const defaultFillEmptyString = "N/A"
var FillEmptySetup = TransformerSetup{
Verb: verbNameFillEmpty,
UsageFunc: transformerFillEmptyUsage,
ParseCLIFunc: transformerFillEmptyParseCLI,
IgnoresInput: false,
}
func transformerFillEmptyUsage(
o *os.File,
) {
fmt.Fprintf(o, "Usage: %s %s [options]\n", "mlr", verbNameFillEmpty)
fmt.Fprintf(o, "Fills empty-string fields with specified fill-value.\n")
fmt.Fprintf(o, "Options:\n")
fmt.Fprintf(o, "-v {string} Fill-value: defaults to \"%s\"\n", defaultFillEmptyString)
fmt.Fprintf(o, "-S Don't infer type -- so '-v 0' would fill string 0 not int 0.\n")
}
func transformerFillEmptyParseCLI(
pargi *int,
argc int,
args []string,
_ *cli.TOptions,
doConstruct bool, // false for first pass of CLI-parse, true for second pass
) IRecordTransformer {
// Skip the verb name from the current spot in the mlr command line
argi := *pargi
verb := args[argi]
argi++
fillString := defaultFillEmptyString
inferType := true
for argi < argc /* variable increment: 1 or 2 depending on flag */ {
opt := args[argi]
if !strings.HasPrefix(opt, "-") {
break // No more flag options to process
}
if args[argi] == "--" {
break // All transformers must do this so main-flags can follow verb-flags
}
argi++
if opt == "-h" || opt == "--help" {
transformerFillEmptyUsage(os.Stdout)
os.Exit(0)
} else if opt == "-v" {
fillString = cli.VerbGetStringArgOrDie(verb, opt, args, &argi, argc)
} else if opt == "-S" {
inferType = false
} else {
transformerFillEmptyUsage(os.Stderr)
os.Exit(1)
}
}
*pargi = argi
if !doConstruct { // All transformers must do this for main command-line parsing
return nil
}
transformer, err := NewTransformerFillEmpty(fillString, inferType)
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
return transformer
}
// ----------------------------------------------------------------
type TransformerFillEmpty struct {
fillValue *mlrval.Mlrval
}
func NewTransformerFillEmpty(
fillString string,
inferType bool,
) (*TransformerFillEmpty, error) {
tr := &TransformerFillEmpty{}
if inferType {
tr.fillValue = mlrval.FromInferredType(fillString)
} else {
tr.fillValue = mlrval.FromString(fillString)
}
return tr, nil
}
// ----------------------------------------------------------------
func (tr *TransformerFillEmpty) Transform(
inrecAndContext *types.RecordAndContext,
outputRecordsAndContexts *list.List, // list of *types.RecordAndContext
inputDownstreamDoneChannel <-chan bool,
outputDownstreamDoneChannel chan<- bool,
) {
HandleDefaultDownstreamDone(inputDownstreamDoneChannel, outputDownstreamDoneChannel)
if !inrecAndContext.EndOfStream {
inrec := inrecAndContext.Record
for pe := inrec.Head; pe != nil; pe = pe.Next {
if pe.Value.IsVoid() {
pe.Value = tr.fillValue
}
}
outputRecordsAndContexts.PushBack(inrecAndContext)
} else { // end of record stream
outputRecordsAndContexts.PushBack(inrecAndContext) // emit end-of-stream marker
}
}
|
