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tsv.go
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tsv.go
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package stream
import (
"bufio"
"io"
"sort"
"strings"
)
func TSVToStream(i io.Reader, sep string) Stream {
ib := bufio.NewReader(i)
var header []string
return func() (Record, error) {
if header == nil {
l, err := ib.ReadString('\n')
if err != nil {
return nil, EOS
}
header = strings.Split(l[:len(l)-1], sep)
}
l, err := ib.ReadString('\n')
if err != nil {
return nil, EOS
}
data := strings.Split(l[:len(l)-1], sep)
r := make(Record, len(header))
for i, f := range header {
r[f] = String(data[i])
}
return r, nil
}
}
func StreamToTSV(o io.Writer, sep string, i Stream) {
var header []string
ob := bufio.NewWriter(o)
for {
r, err := i()
if err != nil {
break
}
if header == nil {
for f := range r {
header = append(header, f)
}
sort.Sort(sort.StringSlice(header))
ob.Write([]byte(strings.Join(header, sep) + "\n"))
}
var l []string
for _, f := range header {
l = append(l, GetString(r, f))
}
ob.Write([]byte(strings.Join(l, sep) + "\n"))
}
ob.Flush()
}