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|
package JsonConfigReader
import (
"bytes"
"io"
)
type state struct {
r io.Reader
br *bytes.Reader
}
func isNL(c byte) bool {
return c == '\n' || c == '\r'
}
func isWS(c byte) bool {
return c == ' ' || c == '\t' || isNL(c)
}
func consumeComment(s []byte, i int) int {
if i < len(s) && s[i] == '/' {
s[i-1] = ' '
for ; i < len(s) && !isNL(s[i]); i += 1 {
s[i] = ' '
}
}
if i < len(s) && s[i] == '*' {
s[i-1] = ' '
s[i] = ' '
for ; i < len(s); i += 1 {
if s[i] != '*' {
s[i] = ' '
} else {
s[i] = ' '
i++
if i < len(s) {
if s[i] == '/' {
s[i] = ' '
break
}
}
}
}
}
return i
}
func prep(r io.Reader) (s []byte, err error) {
buf := &bytes.Buffer{}
_, err = io.Copy(buf, r)
s = buf.Bytes()
if err != nil {
return
}
i := 0
for i < len(s) {
switch s[i] {
case '"':
i += 1
for i < len(s) {
if s[i] == '"' {
i += 1
break
} else if s[i] == '\\' {
i += 1
}
i += 1
}
case '/':
i = consumeComment(s, i+1)
case ',':
j := i
for {
i += 1
if i >= len(s) {
break
} else if s[i] == '}' || s[i] == ']' {
s[j] = ' '
break
} else if s[i] == '/' {
i = consumeComment(s, i+1)
} else if !isWS(s[i]) {
break
}
}
default:
i += 1
}
}
return
}
// Read acts as a proxy for the underlying reader and cleans p
// of comments and trailing commas preceeding ] and }
// comments are delimitted by // up until the end the line
func (st *state) Read(p []byte) (n int, err error) {
if st.br == nil {
var s []byte
if s, err = prep(st.r); err != nil {
return
}
st.br = bytes.NewReader(s)
}
return st.br.Read(p)
}
// New returns an io.Reader acting as proxy to r
func New(r io.Reader) io.Reader {
return &state{r: r}
}
|
