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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,194 @@ | ||
| package transformers | ||
|
|
||
| import ( | ||
| "container/list" | ||
| "fmt" | ||
| "os" | ||
| "strings" | ||
|
|
||
| "github.com/johnkerl/miller/pkg/cli" | ||
| "github.com/johnkerl/miller/pkg/lib" | ||
| "github.com/johnkerl/miller/pkg/mlrval" | ||
| "github.com/johnkerl/miller/pkg/types" | ||
| ) | ||
|
|
||
| // ---------------------------------------------------------------- | ||
| const verbNameSparsify = "sparsify" | ||
|
|
||
| var SparsifySetup = TransformerSetup{ | ||
| Verb: verbNameSparsify, | ||
| UsageFunc: transformerSparsifyUsage, | ||
| ParseCLIFunc: transformerSparsifyParseCLI, | ||
| IgnoresInput: false, | ||
| } | ||
|
|
||
| func transformerSparsifyUsage( | ||
| o *os.File, | ||
| ) { | ||
| fmt.Fprintf(o, "Usage: %s %s [options]\n", "mlr", verbNameSparsify) | ||
| fmt.Fprint(o, | ||
| `Unsets fields for which the key is the empty string (or, optionally, another | ||
| specified value). Only makes sense with output format not being CSV or TSV. | ||
| `) | ||
|
|
||
| fmt.Fprintf(o, "Options:\n") | ||
| fmt.Fprintf(o, "-s {filler string} What values to remove. Defaults to the empty string.\n") | ||
| fmt.Fprintf(o, "-f {a,b,c} Specify field names to be operated on; any other fields won't be\n") | ||
| fmt.Fprintf(o, " modified. The default is to modify all fields.\n") | ||
| fmt.Fprintf(o, "-h|--help Show this message.\n") | ||
|
|
||
| fmt.Fprint(o, | ||
| `Example: if the input is two records, one being 'a=1,b=2' and the other | ||
| being 'b=3,c=4', then the output is the two records 'a=1,b=2,c=' and | ||
| 'a=,b=3,c=4'. | ||
| `) | ||
| } | ||
|
|
||
| func transformerSparsifyParseCLI( | ||
| 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++ | ||
|
|
||
| fillerString := "" | ||
| var specifiedFieldNames []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" { | ||
| transformerSparsifyUsage(os.Stdout) | ||
| os.Exit(0) | ||
|
|
||
| } else if opt == "-s" { | ||
| fillerString = cli.VerbGetStringArgOrDie(verb, opt, args, &argi, argc) | ||
|
|
||
| } else if opt == "-f" { | ||
| specifiedFieldNames = cli.VerbGetStringArrayArgOrDie(verb, opt, args, &argi, argc) | ||
|
|
||
| } else { | ||
| transformerSparsifyUsage(os.Stderr) | ||
| os.Exit(1) | ||
| } | ||
| } | ||
|
|
||
| *pargi = argi | ||
| if !doConstruct { // All transformers must do this for main command-line parsing | ||
| return nil | ||
| } | ||
|
|
||
| transformer, err := NewTransformerSparsify( | ||
| fillerString, | ||
| specifiedFieldNames, | ||
| ) | ||
| if err != nil { | ||
| fmt.Fprintln(os.Stderr, err) | ||
| os.Exit(1) | ||
| } | ||
|
|
||
| return transformer | ||
| } | ||
|
|
||
| // ---------------------------------------------------------------- | ||
| type TransformerSparsify struct { | ||
| fillerString string | ||
| fieldNamesSet map[string]bool | ||
| recordTransformerFunc RecordTransformerFunc | ||
| } | ||
|
|
||
| func NewTransformerSparsify( | ||
| fillerString string, | ||
| specifiedFieldNames []string, | ||
| ) (*TransformerSparsify, error) { | ||
|
|
||
| tr := &TransformerSparsify{ | ||
| fillerString: fillerString, | ||
| fieldNamesSet: lib.StringListToSet(specifiedFieldNames), | ||
| } | ||
| if specifiedFieldNames == nil { | ||
| tr.recordTransformerFunc = tr.transformAll | ||
| } else { | ||
| tr.recordTransformerFunc = tr.transformSome | ||
| } | ||
|
|
||
| return tr, nil | ||
| } | ||
|
|
||
| func (tr *TransformerSparsify) Transform( | ||
| inrecAndContext *types.RecordAndContext, | ||
| outputRecordsAndContexts *list.List, // list of *types.RecordAndContext | ||
| inputDownstreamDoneChannel <-chan bool, | ||
| outputDownstreamDoneChannel chan<- bool, | ||
| ) { | ||
| HandleDefaultDownstreamDone(inputDownstreamDoneChannel, outputDownstreamDoneChannel) | ||
|
|
||
| if !inrecAndContext.EndOfStream { | ||
| tr.recordTransformerFunc( | ||
| inrecAndContext, | ||
| outputRecordsAndContexts, | ||
| inputDownstreamDoneChannel, | ||
| outputDownstreamDoneChannel, | ||
| ) | ||
| } else { | ||
| outputRecordsAndContexts.PushBack(inrecAndContext) // end-of-stream marker | ||
| } | ||
| } | ||
|
|
||
| func (tr *TransformerSparsify) transformAll( | ||
| inrecAndContext *types.RecordAndContext, | ||
| outputRecordsAndContexts *list.List, // list of *types.RecordAndContext | ||
| inputDownstreamDoneChannel <-chan bool, | ||
| outputDownstreamDoneChannel chan<- bool, | ||
| ) { | ||
| inrec := inrecAndContext.Record | ||
| outrec := mlrval.NewMlrmapAsRecord() | ||
|
|
||
| for pe := inrec.Head; pe != nil; pe = pe.Next { | ||
| if pe.Value.String() != tr.fillerString { | ||
| // Reference OK because ownership transfer | ||
| outrec.PutReference(pe.Key, pe.Value) | ||
| } | ||
| } | ||
|
|
||
| outrecAndContext := types.NewRecordAndContext(outrec, &inrecAndContext.Context) | ||
| outputRecordsAndContexts.PushBack(outrecAndContext) | ||
| } | ||
|
|
||
| // ---------------------------------------------------------------- | ||
| func (tr *TransformerSparsify) transformSome( | ||
| inrecAndContext *types.RecordAndContext, | ||
| outputRecordsAndContexts *list.List, // list of *types.RecordAndContext | ||
| inputDownstreamDoneChannel <-chan bool, | ||
| outputDownstreamDoneChannel chan<- bool, | ||
| ) { | ||
| inrec := inrecAndContext.Record | ||
| outrec := mlrval.NewMlrmapAsRecord() | ||
|
|
||
| for pe := inrec.Head; pe != nil; pe = pe.Next { | ||
| if tr.fieldNamesSet[pe.Key] { | ||
| if pe.Value.String() != tr.fillerString { | ||
| // Reference OK because ownership transfer | ||
| outrec.PutReference(pe.Key, pe.Value) | ||
| } | ||
| } else { | ||
| outrec.PutReference(pe.Key, pe.Value) | ||
| } | ||
| } | ||
|
|
||
| outrecAndContext := types.NewRecordAndContext(outrec, &inrecAndContext.Context) | ||
| outputRecordsAndContexts.PushBack(outrecAndContext) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,5 @@ | ||
| a,b,c | ||
| 1,2,3 | ||
| 4,5, | ||
| ,, | ||
| 7,8,9 |