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Copy pathrcreader.go
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rcreader.go
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package ljconf
import (
"bufio"
"bytes"
"io"
)
// *rcReader is a io.Reader ignoring comment lines
type rcReader struct {
left []byte
err error
r *bufio.Reader
}
func (r *rcReader) Read(p []byte) (n int, err error) {
if len(r.left) > 0 {
n = copy(p, r.left)
r.left = r.left[n:]
p = p[n:]
}
if len(r.left) > 0 || len(p) == 0 {
return n, r.err
}
for {
line, err := r.r.ReadBytes('\n')
r.err = err
trimmed := bytes.TrimLeft(line, " \t")
if bytes.HasPrefix(trimmed, []byte("//")) || bytes.HasPrefix(trimmed, []byte(";")) {
if r.err != nil {
continue
}
line = nil
}
r.left = line
rd := copy(p, r.left)
n += rd
r.left = r.left[rd:]
p = p[rd:]
if len(r.left) > 0 || len(p) == 0 || rd == 0 {
return n, r.err
}
}
// Can't reach here
return 0, nil
}
func newRcReader(r io.Reader) *rcReader {
return &rcReader{r: bufio.NewReader(r)}
}