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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/lib"
"github.com/johnkerl/miller/v6/pkg/mlrval"
"github.com/johnkerl/miller/v6/pkg/types"
)
// ----------------------------------------------------------------
const verbNameJSONStringify = "json-stringify"
var JSONStringifySetup = TransformerSetup{
Verb: verbNameJSONStringify,
UsageFunc: transformerJSONStringifyUsage,
ParseCLIFunc: transformerJSONStringifyParseCLI,
IgnoresInput: false,
}
func transformerJSONStringifyUsage(
o *os.File,
) {
fmt.Fprintf(o, "Usage: %s %s [options]\n", "mlr", verbNameJSONStringify)
fmt.Fprint(o,
`Produces string field values from field-value data, e.g. [1,2,3] -> "[1,2,3]".
`)
fmt.Fprintf(o, "Options:\n")
fmt.Fprintf(o, "-f {...} Comma-separated list of field names to json-parse (default all).\n")
fmt.Fprintf(o, "--jvstack Produce multi-line JSON output.\n")
fmt.Fprintf(o, "--no-jvstack Produce single-line JSON output per record (default).\n")
fmt.Fprintf(o, "-h|--help Show this message.\n")
}
func transformerJSONStringifyParseCLI(
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++
var fieldNames []string = nil
jvStack := false // TODO: ??
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" {
transformerJSONStringifyUsage(os.Stdout)
os.Exit(0)
} else if opt == "-f" {
fieldNames = cli.VerbGetStringArrayArgOrDie(verb, opt, args, &argi, argc)
} else if opt == "--jvstack" {
jvStack = true
} else if opt == "--no-jvstack" {
jvStack = false
} else {
transformerJSONStringifyUsage(os.Stderr)
os.Exit(1)
}
}
var jsonFormatting mlrval.TJSONFormatting = mlrval.JSON_SINGLE_LINE
if jvStack {
jsonFormatting = mlrval.JSON_MULTILINE
} else {
jsonFormatting = mlrval.JSON_SINGLE_LINE
}
*pargi = argi
if !doConstruct { // All transformers must do this for main command-line parsing
return nil
}
transformer, err := NewTransformerJSONStringify(
jsonFormatting,
fieldNames,
)
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
return transformer
}
// ----------------------------------------------------------------
type TransformerJSONStringify struct {
// input
jsonFormatting mlrval.TJSONFormatting
fieldNameSet map[string]bool
// state
recordTransformerFunc RecordTransformerFunc
}
func NewTransformerJSONStringify(
jsonFormatting mlrval.TJSONFormatting,
fieldNames []string,
) (*TransformerJSONStringify, error) {
var fieldNameSet map[string]bool = nil
if fieldNames != nil {
fieldNameSet = lib.StringListToSet(fieldNames)
}
retval := &TransformerJSONStringify{
jsonFormatting: jsonFormatting,
fieldNameSet: fieldNameSet,
}
retval.recordTransformerFunc = retval.jsonStringifyAll
if fieldNameSet != nil {
retval.recordTransformerFunc = retval.jsonStringifySome
}
return retval, nil
}
// ----------------------------------------------------------------
func (tr *TransformerJSONStringify) 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 *TransformerJSONStringify) jsonStringifyAll(
inrecAndContext *types.RecordAndContext,
outputRecordsAndContexts *list.List, // list of *types.RecordAndContext
inputDownstreamDoneChannel <-chan bool,
outputDownstreamDoneChannel chan<- bool,
) {
if !inrecAndContext.EndOfStream {
inrec := inrecAndContext.Record
for pe := inrec.Head; pe != nil; pe = pe.Next {
pe.JSONStringifyInPlace(tr.jsonFormatting)
}
outputRecordsAndContexts.PushBack(inrecAndContext)
} else {
outputRecordsAndContexts.PushBack(inrecAndContext) // end-of-stream marker
}
}
// ----------------------------------------------------------------
func (tr *TransformerJSONStringify) jsonStringifySome(
inrecAndContext *types.RecordAndContext,
outputRecordsAndContexts *list.List, // list of *types.RecordAndContext
inputDownstreamDoneChannel <-chan bool,
outputDownstreamDoneChannel chan<- bool,
) {
if !inrecAndContext.EndOfStream {
inrec := inrecAndContext.Record
for pe := inrec.Head; pe != nil; pe = pe.Next {
if tr.fieldNameSet[pe.Key] {
pe.JSONStringifyInPlace(tr.jsonFormatting)
}
}
outputRecordsAndContexts.PushBack(inrecAndContext)
} else {
outputRecordsAndContexts.PushBack(inrecAndContext) // end-of-stream marker
}
}
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