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package quicktemplate
import (
"bytes"
"io"
)
type htmlEscapeWriter struct {
w io.Writer
}
func (w *htmlEscapeWriter) Write(b []byte) (int, error) {
if bytes.IndexByte(b, '<') < 0 &&
bytes.IndexByte(b, '>') < 0 &&
bytes.IndexByte(b, '"') < 0 &&
bytes.IndexByte(b, '\'') < 0 &&
bytes.IndexByte(b, '&') < 0 {
// fast path - nothing to escape
return w.w.Write(b)
}
// slow path
write := w.w.Write
j := 0
for i, c := range b {
switch c {
case '<':
write(b[j:i])
write(strLT)
j = i + 1
case '>':
write(b[j:i])
write(strGT)
j = i + 1
case '"':
write(b[j:i])
write(strQuot)
j = i + 1
case '\'':
write(b[j:i])
write(strApos)
j = i + 1
case '&':
write(b[j:i])
write(strAmp)
j = i + 1
}
}
if n, err := write(b[j:]); err != nil {
return j + n, err
}
return len(b), nil
}
var (
strLT = []byte("<")
strGT = []byte(">")
strQuot = []byte(""")
strApos = []byte("'")
strAmp = []byte("&")
)
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