mirror of
https://github.com/johnkerl/miller.git
synced 2026-01-23 02:14:13 +00:00
121 lines
3.4 KiB
Go
121 lines
3.4 KiB
Go
package transformers
|
|
|
|
import (
|
|
"fmt"
|
|
"os"
|
|
"strings"
|
|
|
|
"github.com/johnkerl/miller/v6/pkg/cli"
|
|
"github.com/johnkerl/miller/v6/pkg/lib"
|
|
"github.com/johnkerl/miller/v6/pkg/mlrval"
|
|
"github.com/johnkerl/miller/v6/pkg/types"
|
|
)
|
|
|
|
// ----------------------------------------------------------------
|
|
const verbNameRegularize = "regularize"
|
|
|
|
var RegularizeSetup = TransformerSetup{
|
|
Verb: verbNameRegularize,
|
|
UsageFunc: transformerRegularizeUsage,
|
|
ParseCLIFunc: transformerRegularizeParseCLI,
|
|
IgnoresInput: false,
|
|
}
|
|
|
|
func transformerRegularizeUsage(
|
|
o *os.File,
|
|
) {
|
|
fmt.Fprintf(o, "Usage: %s %s [options]\n", "mlr", verbNameRegularize)
|
|
fmt.Fprintf(o, "Outputs records sorted lexically ascending by keys.\n")
|
|
fmt.Fprintf(o, "Options:\n")
|
|
fmt.Fprintf(o, "-h|--help Show this message.\n")
|
|
}
|
|
|
|
func transformerRegularizeParseCLI(
|
|
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
|
|
argi++
|
|
|
|
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" {
|
|
transformerRegularizeUsage(os.Stdout)
|
|
os.Exit(0)
|
|
|
|
} else {
|
|
transformerRegularizeUsage(os.Stderr)
|
|
os.Exit(1)
|
|
}
|
|
}
|
|
|
|
*pargi = argi
|
|
if !doConstruct { // All transformers must do this for main command-line parsing
|
|
return nil
|
|
}
|
|
|
|
transformer, err := NewTransformerRegularize()
|
|
if err != nil {
|
|
fmt.Fprintln(os.Stderr, err)
|
|
os.Exit(1)
|
|
}
|
|
|
|
return transformer
|
|
}
|
|
|
|
// ----------------------------------------------------------------
|
|
type TransformerRegularize struct {
|
|
// map from string to []string
|
|
sortedToOriginal map[string][]string
|
|
}
|
|
|
|
func NewTransformerRegularize() (*TransformerRegularize, error) {
|
|
tr := &TransformerRegularize{
|
|
make(map[string][]string),
|
|
}
|
|
return tr, nil
|
|
}
|
|
|
|
// ----------------------------------------------------------------
|
|
|
|
func (tr *TransformerRegularize) Transform(
|
|
inrecAndContext *types.RecordAndContext,
|
|
outputRecordsAndContexts *types.List[*types.RecordAndContext],
|
|
inputDownstreamDoneChannel <-chan bool,
|
|
outputDownstreamDoneChannel chan<- bool,
|
|
) {
|
|
HandleDefaultDownstreamDone(inputDownstreamDoneChannel, outputDownstreamDoneChannel)
|
|
if !inrecAndContext.EndOfStream {
|
|
inrec := inrecAndContext.Record
|
|
currentFieldNames := inrec.GetKeys()
|
|
currentSortedFieldNames := lib.SortedStrings(currentFieldNames)
|
|
currentSortedFieldNamesJoined := strings.Join(currentSortedFieldNames, ",")
|
|
previousSortedFieldNames := tr.sortedToOriginal[currentSortedFieldNamesJoined]
|
|
if previousSortedFieldNames == nil {
|
|
tr.sortedToOriginal[currentSortedFieldNamesJoined] = currentFieldNames
|
|
outputRecordsAndContexts.PushBack(inrecAndContext)
|
|
} else {
|
|
outrec := mlrval.NewMlrmapAsRecord()
|
|
for _, fieldName := range previousSortedFieldNames {
|
|
outrec.PutReference(fieldName, inrec.Get(fieldName)) // inrec will be GC'ed
|
|
}
|
|
outrecAndContext := types.NewRecordAndContext(outrec, &inrecAndContext.Context)
|
|
outputRecordsAndContexts.PushBack(outrecAndContext)
|
|
}
|
|
} else {
|
|
outputRecordsAndContexts.PushBack(inrecAndContext) // end-of-stream marker
|
|
}
|
|
}
|