/
writer.go
99 lines (83 loc) · 1.73 KB
/
writer.go
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package csv
import (
"bufio"
"io"
"github.com/mithrandie/go-text"
)
const QuotationMark = 0x22
type Writer struct {
Delimiter rune
writer *bufio.Writer
lineBreak string
appended bool
}
func NewWriter(w io.Writer, lineBreak text.LineBreak, enc text.Encoding) (*Writer, error) {
writer, err := text.GetTransformWriter(w, enc)
if err != nil {
return nil, err
}
return &Writer{
Delimiter: ',',
lineBreak: lineBreak.Value(),
writer: bufio.NewWriter(writer),
}, nil
}
func (e *Writer) Write(record []Field) error {
if e.appended {
if _, err := e.writer.WriteString(e.lineBreak); err != nil {
return err
}
} else {
e.appended = true
}
for i := 0; i < len(record); i++ {
if 0 < i {
if _, err := e.writer.WriteRune(e.Delimiter); err != nil {
return err
}
}
if record[i].Quote || e.includeDelimiterOrQuote(record[i].Contents) {
if err := e.writer.WriteByte(QuotationMark); err != nil {
return err
}
runes := []rune(record[i].Contents)
pos := 0
for {
if len(runes) <= pos {
break
}
r := runes[pos]
switch r {
case '"':
if _, err := e.writer.Write([]byte{QuotationMark, QuotationMark}); err != nil {
return err
}
default:
if _, err := e.writer.WriteRune(r); err != nil {
return err
}
}
pos++
}
if err := e.writer.WriteByte(QuotationMark); err != nil {
return err
}
} else {
if _, err := e.writer.WriteString(record[i].Contents); err != nil {
return err
}
}
}
return nil
}
func (e *Writer) Flush() error {
return e.writer.Flush()
}
func (e *Writer) includeDelimiterOrQuote(s string) bool {
for _, r := range s {
if r == e.Delimiter || r == QuotationMark {
return true
}
}
return false
}