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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/types"
)
// ----------------------------------------------------------------
const verbNameJSONParse = "json-parse"
var JSONParseSetup = TransformerSetup{
Verb: verbNameJSONParse,
UsageFunc: transformerJSONParseUsage,
ParseCLIFunc: transformerJSONParseParseCLI,
IgnoresInput: false,
}
func transformerJSONParseUsage(
o *os.File,
) {
fmt.Fprintf(o, "Usage: %s %s [options]\n", "mlr", verbNameJSONParse)
fmt.Fprintln(
o,
`Tries to convert string field values to parsed JSON, 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, "-k If supplied, then on parse fail for any cell, keep the (unparsable)\n")
fmt.Fprintf(o, " input value for the cell.\n")
fmt.Fprintf(o, "-h|--help Show this message.\n")
}
func transformerJSONParseParseCLI(
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++
keepFailed := false
var fieldNames []string = nil
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" {
transformerJSONParseUsage(os.Stdout)
os.Exit(0)
} else if opt == "-f" {
fieldNames = cli.VerbGetStringArrayArgOrDie(verb, opt, args, &argi, argc)
} else if opt == "-k" {
keepFailed = true
} else {
transformerJSONParseUsage(os.Stderr)
os.Exit(1)
}
}
*pargi = argi
if !doConstruct { // All transformers must do this for main command-line parsing
return nil
}
transformer, err := NewTransformerJSONParse(
fieldNames,
keepFailed,
)
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
return transformer
}
// ----------------------------------------------------------------
type TransformerJSONParse struct {
// input
fieldNameSet map[string]bool
keepFailed bool
// state
recordTransformerFunc RecordTransformerFunc
}
func NewTransformerJSONParse(
fieldNames []string,
keepFailed bool,
) (*TransformerJSONParse, error) {
var fieldNameSet map[string]bool = nil
if fieldNames != nil {
fieldNameSet = lib.StringListToSet(fieldNames)
}
retval := &TransformerJSONParse{
fieldNameSet: fieldNameSet,
keepFailed: keepFailed,
}
retval.recordTransformerFunc = retval.jsonParseAll
if fieldNameSet != nil {
retval.recordTransformerFunc = retval.jsonParseSome
}
return retval, nil
}
// ----------------------------------------------------------------
func (tr *TransformerJSONParse) 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 *TransformerJSONParse) jsonParseAll(
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.keepFailed {
pe.JSONTryParseInPlace()
} else {
pe.JSONParseInPlace()
}
}
outputRecordsAndContexts.PushBack(inrecAndContext)
} else {
outputRecordsAndContexts.PushBack(inrecAndContext) // end-of-stream marker
}
}
// ----------------------------------------------------------------
func (tr *TransformerJSONParse) jsonParseSome(
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] {
if tr.keepFailed {
pe.JSONTryParseInPlace()
} else {
pe.JSONParseInPlace()
}
}
}
outputRecordsAndContexts.PushBack(inrecAndContext)
} else {
outputRecordsAndContexts.PushBack(inrecAndContext) // end-of-stream marker
}
}
|
