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csv.go
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csv.go
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package DragonBlood
import (
"encoding/csv"
"io"
"os"
)
type CSVHandler interface {
// Import() calls CSVHandler.Header() with the first row (assumed to be a header row)
Header(header []string)
// Import() calls CSVHandler.Add() in each record after the required header.
// Header() is called before Add() is called.
Add(data []string)
// Import() calls CSVHandler.Finalize() when entire file is read successfully.
Finalize()
// Import() calls Abort() if any error occurs before reading to the end of the file.
Abort()
}
// Import() reads a CSV file from an io.Reader object.
// Client-provided callbacks are provided by an implemention of
// CSVHandler. It returns any error that occured file reading or
// parsing the file.
func Import(reader io.Reader, handler CSVHandler) error {
var data []string
csvReader := csv.NewReader(reader)
header, err := csvReader.Read()
if err == nil {
handler.Header(header)
for data, err = csvReader.Read(); err == nil; data, err = csvReader.Read() {
handler.Add(data)
}
}
if err == io.EOF {
handler.Finalize()
return nil
} else {
handler.Abort()
return err
}
}
func ImportFile(filename string, handler CSVHandler) error {
file, err := os.Open(filename)
if err == nil {
defer file.Close()
return Import(file, handler)
} else {
return err
}
}