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package quicktemplate
func appendURLEncode(dst []byte, src string) []byte {
n := len(src)
if n > 0 {
// Hint the compiler to remove bounds checks in the loop below.
_ = src[n-1]
}
for i := 0; i < n; i++ {
c := src[i]
// See http://www.w3.org/TR/html5/forms.html#form-submission-algorithm
if c >= 'a' && c <= 'z' || c >= 'A' && c <= 'Z' || c >= '0' && c <= '9' ||
c == '-' || c == '.' || c == '_' {
dst = append(dst, c)
} else {
if c == ' ' {
dst = append(dst, '+')
} else {
dst = append(dst, '%', hexCharUpper(c>>4), hexCharUpper(c&15))
}
}
}
return dst
}
func hexCharUpper(c byte) byte {
if c < 10 {
return '0' + c
}
return c - 10 + 'A'
}
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