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package input
import (
"container/list"
"fmt"
"github.com/johnkerl/miller/v6/pkg/bifs"
"github.com/johnkerl/miller/v6/pkg/cli"
"github.com/johnkerl/miller/v6/pkg/mlrval"
"github.com/johnkerl/miller/v6/pkg/types"
)
type PseudoReaderGen struct {
readerOptions *cli.TReaderOptions
recordsPerBatch int64 // distinct from readerOptions.RecordsPerBatch for join/repl
}
func NewPseudoReaderGen(
readerOptions *cli.TReaderOptions,
recordsPerBatch int64,
) (*PseudoReaderGen, error) {
return &PseudoReaderGen{
readerOptions: readerOptions,
recordsPerBatch: recordsPerBatch,
}, nil
}
func (reader *PseudoReaderGen) Read(
filenames []string, // ignored
context types.Context,
readerChannel chan<- *list.List, // list of *types.RecordAndContext
errorChannel chan error,
downstreamDoneChannel <-chan bool, // for mlr head
) {
reader.process(&context, readerChannel, errorChannel, downstreamDoneChannel)
readerChannel <- types.NewEndOfStreamMarkerList(&context)
}
func (reader *PseudoReaderGen) process(
context *types.Context,
readerChannel chan<- *list.List, // list of *types.RecordAndContext
errorChannel chan error,
downstreamDoneChannel <-chan bool, // for mlr head
) {
context.UpdateForStartOfFile("(gen-pseudo-reader)")
recordsPerBatch := reader.recordsPerBatch
start, err := reader.tryParse("start", reader.readerOptions.GeneratorOptions.StartAsString)
if err != nil {
errorChannel <- err
return
}
step, err := reader.tryParse("step", reader.readerOptions.GeneratorOptions.StepAsString)
if err != nil {
errorChannel <- err
return
}
stop, err := reader.tryParse("stop", reader.readerOptions.GeneratorOptions.StopAsString)
if err != nil {
errorChannel <- err
return
}
var doneComparator mlrval.CmpFuncBool = mlrval.GreaterThan
if step.GetNumericNegativeorDie() {
doneComparator = mlrval.LessThan
}
key := reader.readerOptions.GeneratorOptions.FieldName
value := start.Copy()
recordsAndContexts := list.New()
eof := false
for !eof {
if doneComparator(value, stop) {
break
}
record := mlrval.NewMlrmap()
record.PutCopy(key, value)
context.UpdateForInputRecord()
recordsAndContexts.PushBack(types.NewRecordAndContext(record, context))
if int64(recordsAndContexts.Len()) >= recordsPerBatch {
readerChannel <- recordsAndContexts
recordsAndContexts = list.New()
// See if downstream processors will be ignoring further data (e.g.
// mlr head). If so, stop reading. This makes 'mlr head hugefile'
// exit quickly, as it should. Check this only every so often to
// avoid goroutine-scheduler thrash.
eof := false
select {
case <-downstreamDoneChannel:
eof = true
break
default:
break
}
if eof {
break
}
}
value = bifs.BIF_plus_binary(value, step)
}
if recordsAndContexts.Len() > 0 {
readerChannel <- recordsAndContexts
}
}
func (reader *PseudoReaderGen) tryParse(
name string,
svalue string,
) (*mlrval.Mlrval, error) {
mvalue := mlrval.FromDeferredType(svalue)
if mvalue == nil || !mvalue.IsNumeric() {
return nil, fmt.Errorf("mlr: gen: %s \"%s\" is not parseable as number", name, svalue)
}
return mvalue, nil
}
//#include <stdio.h>
//#include <stdlib.h>
//#include "lib/mlr_globals.h"
//#include "lib/mlrutil.h"
//#include "input/lrec_readers.h"
//
//typedef struct _lrec_reader_gen_state_t {
// char* field_name;
// unsigned long long start;
// unsigned long long stop;
// unsigned long long step;
// unsigned long long current_value;
//} lrec_reader_gen_state_t;
//
//static void lrec_reader_gen_free(lrec_reader_t* preader);
//static void* lrec_reader_gen_open(void* pvstate, char* prepipe, char* filename);
//static void lrec_reader_gen_close(void* pvstate, void* pvhandle, char* prepipe);
//static void lrec_reader_gen_sof(void* pvstate, void* pvhandle);
//static lrec_t* lrec_reader_gen_process(void* pvstate, void* pvhandle, context_t* pctx);
//
//// ----------------------------------------------------------------
//lrec_reader_t* lrec_reader_gen_alloc(char* field_name,
// unsigned long long start, unsigned long long stop, unsigned long long step)
//{
// lrec_reader_t* plrec_reader = mlr_malloc_or_die(sizeof(lrec_reader_t));
//
// lrec_reader_gen_state_t* pstate = mlr_malloc_or_die(sizeof(lrec_reader_gen_state_t));
// pstate->field_name = field_name;
// pstate->start = start;
// pstate->stop = stop;
// pstate->step = step;
// pstate->current_value = start;
//
// plrec_reader->pvstate = (void*)pstate;
// plrec_reader->popen_func = lrec_reader_gen_open;
// plrec_reader->pclose_func = lrec_reader_gen_close;
// plrec_reader->pprocess_func = lrec_reader_gen_process;
// plrec_reader->psof_func = lrec_reader_gen_sof;
// plrec_reader->pfree_func = lrec_reader_gen_free;
//
// return plrec_reader;
//}
//
//static void* lrec_reader_gen_open(void* pvstate, char* prepipe, char* filename) {
// return NULL;
//}
//
//static void lrec_reader_gen_close(void* pvstate, void* pvhandle, char* prepipe) {
//}
//
//static void lrec_reader_gen_free(lrec_reader_t* preader) {
// free(preader->pvstate);
// free(preader);
//}
//
//static void lrec_reader_gen_sof(void* pvstate, void* pvhandle) {
// lrec_reader_gen_state_t* pstate = pvstate;
// pstate->current_value = pstate->start;
//}
//
//// ----------------------------------------------------------------
//static lrec_t* lrec_reader_gen_process(void* pvstate, void* pvhandle, context_t* pctx) {
// lrec_reader_gen_state_t* pstate = pvstate;
// if (pstate->current_value > pstate->stop) {
// return NULL;
// }
//
// lrec_t* prec = lrec_unbacked_alloc();
// char* key = pstate->field_name;
// char* value = mlr_alloc_string_from_ll(pstate->current_value);
// pstate->current_value += pstate->step;
//
// lrec_put(prec, key, value, FREE_ENTRY_VALUE);
//
// return prec;
//}
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