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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/types"
)
type tRepeatCountSource int
const (
repeatCountSourceUnspecified tRepeatCountSource = iota
repeatCountFromInt
repeatCountFromFieldName
)
// ----------------------------------------------------------------
const verbNameRepeat = "repeat"
var RepeatSetup = TransformerSetup{
Verb: verbNameRepeat,
UsageFunc: transformerRepeatUsage,
ParseCLIFunc: transformerRepeatParseCLI,
IgnoresInput: false,
}
func transformerRepeatUsage(
o *os.File,
) {
fmt.Fprintf(o, "Usage: %s %s [options]\n", "mlr", verbNameRepeat)
fmt.Fprintf(o, "Copies input records to output records multiple times.\n")
fmt.Fprintf(o, "Options must be exactly one of the following:\n")
fmt.Fprintf(o, "-n {repeat count} Repeat each input record this many times.\n")
fmt.Fprintf(o, "-f {field name} Same, but take the repeat count from the specified\n")
fmt.Fprintf(o, " field name of each input record.\n")
fmt.Fprintf(o, "-h|--help Show this message.\n")
fmt.Fprintf(o, "Example:\n")
fmt.Fprintf(o, " echo x=0 | %s %s -n 4 then put '$x=urand()'\n", "mlr", verbNameRepeat)
fmt.Fprintf(o, "produces:\n")
fmt.Fprintf(o, " x=0.488189\n")
fmt.Fprintf(o, " x=0.484973\n")
fmt.Fprintf(o, " x=0.704983\n")
fmt.Fprintf(o, " x=0.147311\n")
fmt.Fprintf(o, "Example:\n")
fmt.Fprintf(o, " echo a=1,b=2,c=3 | %s %s -f b\n", "mlr", verbNameRepeat)
fmt.Fprintf(o, "produces:\n")
fmt.Fprintf(o, " a=1,b=2,c=3\n")
fmt.Fprintf(o, " a=1,b=2,c=3\n")
fmt.Fprintf(o, "Example:\n")
fmt.Fprintf(o, " echo a=1,b=2,c=3 | %s %s -f c\n", "mlr", verbNameRepeat)
fmt.Fprintf(o, "produces:\n")
fmt.Fprintf(o, " a=1,b=2,c=3\n")
fmt.Fprintf(o, " a=1,b=2,c=3\n")
fmt.Fprintf(o, " a=1,b=2,c=3\n")
}
func transformerRepeatParseCLI(
pargi *int,
argc int,
args []string,
_ *cli.TOptions,
doConstruct bool, // false for first pass of CLI-parse, true for second pass
) IRecordTransformer {
repeatCountSource := repeatCountSourceUnspecified
repeatCount := int64(0)
repeatCountFieldName := ""
// Skip the verb name from the current spot in the mlr command line
argi := *pargi
verb := args[argi]
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" {
transformerRepeatUsage(os.Stdout)
os.Exit(0)
} else if opt == "-n" {
repeatCount = cli.VerbGetIntArgOrDie(verb, opt, args, &argi, argc)
repeatCountSource = repeatCountFromInt
} else if opt == "-f" {
repeatCountFieldName = cli.VerbGetStringArgOrDie(verb, opt, args, &argi, argc)
repeatCountSource = repeatCountFromFieldName
} else {
transformerRepeatUsage(os.Stderr)
os.Exit(1)
}
}
if repeatCountSource == repeatCountSourceUnspecified {
transformerRepeatUsage(os.Stderr)
os.Exit(1)
}
*pargi = argi
if !doConstruct { // All transformers must do this for main command-line parsing
return nil
}
transformer, err := NewTransformerRepeat(
repeatCountSource,
repeatCount,
repeatCountFieldName,
)
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
return transformer
}
// ----------------------------------------------------------------
type TransformerRepeat struct {
repeatCount int64
repeatCountFieldName string
recordTransformerFunc RecordTransformerFunc
}
// ----------------------------------------------------------------
func NewTransformerRepeat(
repeatCountSource tRepeatCountSource,
repeatCount int64,
repeatCountFieldName string,
) (*TransformerRepeat, error) {
tr := &TransformerRepeat{
repeatCount: repeatCount,
repeatCountFieldName: repeatCountFieldName,
}
if repeatCountSource == repeatCountFromInt {
tr.recordTransformerFunc = tr.repeatByCount
} else {
tr.recordTransformerFunc = tr.repeatByFieldName
}
return tr, nil
}
// ----------------------------------------------------------------
func (tr *TransformerRepeat) Transform(
inrecAndContext *types.RecordAndContext,
outputRecordsAndContexts *list.List, // list of *types.RecordAndContext
inputDownstreamDoneChannel <-chan bool,
outputDownstreamDoneChannel chan<- bool,
) {
HandleDefaultDownstreamDone(inputDownstreamDoneChannel, outputDownstreamDoneChannel)
tr.recordTransformerFunc(inrecAndContext, outputRecordsAndContexts, inputDownstreamDoneChannel, outputDownstreamDoneChannel)
}
// ----------------------------------------------------------------
func (tr *TransformerRepeat) repeatByCount(
inrecAndContext *types.RecordAndContext,
outputRecordsAndContexts *list.List, // list of *types.RecordAndContext
inputDownstreamDoneChannel <-chan bool,
outputDownstreamDoneChannel chan<- bool,
) {
if !inrecAndContext.EndOfStream {
for i := int64(0); i < tr.repeatCount; i++ {
outputRecordsAndContexts.PushBack(types.NewRecordAndContext(
inrecAndContext.Record.Copy(),
&inrecAndContext.Context,
))
}
} else {
outputRecordsAndContexts.PushBack(inrecAndContext)
}
}
// ----------------------------------------------------------------
func (tr *TransformerRepeat) repeatByFieldName(
inrecAndContext *types.RecordAndContext,
outputRecordsAndContexts *list.List, // list of *types.RecordAndContext
inputDownstreamDoneChannel <-chan bool,
outputDownstreamDoneChannel chan<- bool,
) {
if !inrecAndContext.EndOfStream {
fieldValue := inrecAndContext.Record.Get(tr.repeatCountFieldName)
if fieldValue == nil {
return
}
repeatCount, ok := fieldValue.GetIntValue()
if !ok {
return
}
for i := 0; i < int(repeatCount); i++ {
outputRecordsAndContexts.PushBack(types.NewRecordAndContext(
inrecAndContext.Record.Copy(),
&inrecAndContext.Context,
))
}
} else {
outputRecordsAndContexts.PushBack(inrecAndContext)
}
}
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