drone-matrix/vendor/github.com/aymerick/raymond/escape.go
2018-01-08 09:54:13 +01:00

66 lines
1.2 KiB
Go

package raymond
import (
"bytes"
"strings"
)
//
// That whole file is borrowed from https://github.com/golang/go/tree/master/src/html/escape.go
//
// With changes:
// &#39 => '
// &#34 => "
//
// To stay in sync with JS implementation, and make mustache tests pass.
//
type writer interface {
WriteString(string) (int, error)
}
const escapedChars = `&'<>"`
func escape(w writer, s string) error {
i := strings.IndexAny(s, escapedChars)
for i != -1 {
if _, err := w.WriteString(s[:i]); err != nil {
return err
}
var esc string
switch s[i] {
case '&':
esc = "&amp;"
case '\'':
esc = "&apos;"
case '<':
esc = "&lt;"
case '>':
esc = "&gt;"
case '"':
esc = "&quot;"
default:
panic("unrecognized escape character")
}
s = s[i+1:]
if _, err := w.WriteString(esc); err != nil {
return err
}
i = strings.IndexAny(s, escapedChars)
}
_, err := w.WriteString(s)
return err
}
// Escape escapes special HTML characters.
//
// It can be used by helpers that return a SafeString and that need to escape some content by themselves.
func Escape(s string) string {
if strings.IndexAny(s, escapedChars) == -1 {
return s
}
var buf bytes.Buffer
escape(&buf, s)
return buf.String()
}