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|
package dstream
import (
"fmt"
"time"
"io"
"os"
"strconv"
"math"
)
// Next advances to the next chunk.
func (cs *CSVReader) Next() bool {
if cs.done {
return false
}
if cs.limitchunk > 0 && cs.limitchunk <= cs.chunknum {
cs.done = true
return false
}
cs.chunknum++
truncate(cs.bdata)
for j := 0; j < cs.chunkSize; j++ {
// Try to read a row, return false if done.
var rec []string
var err error
if cs.firstrow != nil {
rec = cs.firstrow
cs.firstrow = nil
} else {
rec, err = cs.csvrdr.Read()
if err == io.EOF {
cs.done = true
return ilen(cs.bdata[0]) > 0
} else if err != nil {
if cs.skipErrors {
os.Stderr.WriteString(fmt.Sprintf("%v\n", err))
continue
}
panic(err)
}
}
cs.nobs++
for pos, typ := range cs.types {
fpos := cs.filepos[pos]
switch typ.Type {
{{- range . }}
case {{ .Utype }}:
{{- if eq .ConvGroup "i" }}
x, err := strconv.Atoi(rec[fpos])
if err != nil {
panic(err)
}
{{- else if eq .ConvGroup "f" }}
x, err := strconv.ParseFloat(rec[fpos], 64)
if err != nil {
x = math.NaN()
}
{{- else if eq .ConvGroup "s" }}
x := rec[fpos]
{{- else }}
x := cs.parseTime(rec[fpos])
{{- end }}
u := cs.bdata[pos].([]{{ .Type }})
cs.bdata[pos] = append(u, {{ .Type }}(x))
{{- end }}
default:
panic("unknown type")
}
}
}
return true
}
func (cs *CSVReader) setbdata() {
cs.bdata = make([]interface{}, len(cs.names))
for pos, dtype := range cs.dtypes {
switch dtype {
{{- range . }}
case {{ .Utype }}:
cs.bdata[pos] = make([]{{ .Type }}, 0)
{{- end }}
default:
panic("Unknown type")
}
}
}
|
