/
io.go
49 lines (44 loc) · 953 Bytes
/
io.go
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package main
import (
"bytes"
"io"
)
const READ_BUFFER_SIZE = 4096
func NewBuffer(r io.Reader) (Buffer, error) {
var b Buffer
b.Lines = make([]Line, 0)
// bytes are read into this from the reader
rb := make([]byte, READ_BUFFER_SIZE)
// bytes are queued here until we find EOL
lb := make([]byte, 0, READ_BUFFER_SIZE)
for {
n, err := r.Read(rb)
for i := 0; i < n; i++ {
lb = append(lb, rb[i])
if rb[i] == '\n' {
l := Line(bytes.Runes(lb))
b.Lines = append(b.Lines, l)
lb = make([]byte, 0, READ_BUFFER_SIZE)
}
}
if err != nil && err == io.EOF {
lb = append(lb, '\n')
l := Line(bytes.Runes(lb))
b.Lines = append(b.Lines, l)
lb = make([]byte, 0, READ_BUFFER_SIZE)
break
} else if err != nil {
return b, err
}
}
return b, nil
}
func (b Buffer) Write(w io.Writer) error {
for _, l := range b.Lines {
_, err := w.Write([]byte(string(l)))
if err != nil {
return err
}
}
return nil
}