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|
package input
import (
"io"
"strings"
"pault.ag/go/debian/control"
"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"
)
// DCF list-valued field names (comma-separated in the format). These are
// exposed as Miller arrays; all other fields remain strings.
var dcfListFieldNames = map[string]bool{
"Depends": true,
"Pre-Depends": true,
"Recommends": true,
"Suggests": true,
"Enhances": true,
"Breaks": true,
"Conflicts": true,
"Replaces": true,
"Build-Depends": true,
"Build-Depends-Indep": true,
"Build-Conflicts": true,
"Build-Conflicts-Indep": true,
"Built-Using": true,
}
type RecordReaderDCF struct {
readerOptions *cli.TReaderOptions
recordsPerBatch int64
}
func NewRecordReaderDCF(
readerOptions *cli.TReaderOptions,
recordsPerBatch int64,
) (*RecordReaderDCF, error) {
return &RecordReaderDCF{
readerOptions: readerOptions,
recordsPerBatch: recordsPerBatch,
}, nil
}
func (reader *RecordReaderDCF) Read(
filenames []string,
context types.Context,
readerChannel chan<- []*types.RecordAndContext,
errorChannel chan error,
downstreamDoneChannel <-chan bool,
) {
if filenames != nil {
if len(filenames) == 0 {
handle, err := lib.OpenStdin(
reader.readerOptions.Prepipe,
reader.readerOptions.PrepipeIsRaw,
reader.readerOptions.FileInputEncoding,
)
if err != nil {
errorChannel <- err
} else {
reader.processHandle(handle, "(stdin)", &context, readerChannel, errorChannel, downstreamDoneChannel)
}
} else {
for _, filename := range filenames {
handle, err := lib.OpenFileForRead(
filename,
reader.readerOptions.Prepipe,
reader.readerOptions.PrepipeIsRaw,
reader.readerOptions.FileInputEncoding,
)
if err != nil {
errorChannel <- err
} else {
reader.processHandle(handle, filename, &context, readerChannel, errorChannel, downstreamDoneChannel)
handle.Close()
}
}
}
}
readerChannel <- types.NewEndOfStreamMarkerList(&context)
}
func (reader *RecordReaderDCF) processHandle(
handle io.Reader,
filename string,
context *types.Context,
readerChannel chan<- []*types.RecordAndContext,
errorChannel chan error,
downstreamDoneChannel <-chan bool,
) {
context.UpdateForStartOfFile(filename)
recordsPerBatch := reader.recordsPerBatch
pr, err := control.NewParagraphReader(handle, nil)
if err != nil {
errorChannel <- err
return
}
recordsAndContexts := make([]*types.RecordAndContext, 0, recordsPerBatch)
i := int64(0)
for {
i++
if i%recordsPerBatch == 0 {
select {
case <-downstreamDoneChannel:
goto flush
default:
}
}
para, err := pr.Next()
if err != nil {
if err == io.EOF {
break
}
errorChannel <- err
return
}
if para == nil {
break
}
rec := dcfParagraphToRecord(para, reader.readerOptions.DedupeFieldNames)
if rec == nil {
// dedupe or other error already sent
return
}
context.UpdateForInputRecord()
recordsAndContexts = append(recordsAndContexts, types.NewRecordAndContext(rec, context))
if int64(len(recordsAndContexts)) >= recordsPerBatch {
readerChannel <- recordsAndContexts
recordsAndContexts = make([]*types.RecordAndContext, 0, recordsPerBatch)
}
}
flush:
if len(recordsAndContexts) > 0 {
readerChannel <- recordsAndContexts
}
}
// splitCommaList splits a DCF comma-separated value and returns Miller Mlrval
// array elements (trimmed, skipping empty).
func splitCommaList(s string) []*mlrval.Mlrval {
parts := strings.Split(s, ",")
out := make([]*mlrval.Mlrval, 0, len(parts))
for _, p := range parts {
p = strings.TrimSpace(p)
if p == "" {
continue
}
out = append(out, mlrval.FromString(p))
}
return out
}
// dcfParagraphToRecord converts a control paragraph to a Miller record. List
// fields (Depends, Build-Depends, etc.) become arrays; all other fields stay
// strings. Uses para.Order to preserve field order. Returns nil on error (caller
// must have sent on errorChannel).
func dcfParagraphToRecord(para *control.Paragraph, dedupeFieldNames bool) *mlrval.Mlrmap {
rec := mlrval.NewMlrmapAsRecord()
// Preserve order from the DCF file when present.
keys := para.Order
if len(keys) == 0 {
for k := range para.Values {
keys = append(keys, k)
}
}
for _, k := range keys {
v, ok := para.Values[k]
if !ok {
continue
}
var mv *mlrval.Mlrval
if dcfListFieldNames[k] {
mv = mlrval.FromArray(splitCommaList(v))
} else {
mv = mlrval.FromString(v)
}
if _, err := rec.PutReferenceMaybeDedupe(k, mv, dedupeFieldNames); err != nil {
return nil
}
}
return rec
}
|
