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|
package quicktemplate
import (
"fmt"
"strings"
)
func hasSpecialChars(s string) bool {
if strings.IndexByte(s, '"') >= 0 || strings.IndexByte(s, '\\') >= 0 || strings.IndexByte(s, '<') >= 0 || strings.IndexByte(s, '\'') >= 0 {
return true
}
for i := 0; i < len(s); i++ {
if s[i] < 0x20 {
return true
}
}
return false
}
func appendJSONString(dst []byte, s string, addQuotes bool) []byte {
if !hasSpecialChars(s) {
// Fast path - nothing to escape.
if !addQuotes {
return append(dst, s...)
}
dst = append(dst, '"')
dst = append(dst, s...)
dst = append(dst, '"')
return dst
}
// Slow path - there are chars to escape.
if addQuotes {
dst = append(dst, '"')
}
bb := AcquireByteBuffer()
var tmp []byte
tmp, bb.B = bb.B, dst
_, err := jsonReplacer.WriteString(bb, s)
if err != nil {
panic(fmt.Errorf("BUG: unexpected error returned from jsonReplacer.WriteString: %s", err))
}
dst, bb.B = bb.B, tmp
ReleaseByteBuffer(bb)
if addQuotes {
dst = append(dst, '"')
}
return dst
}
var jsonReplacer = strings.NewReplacer(func() []string {
a := []string{
"\n", `\n`,
"\r", `\r`,
"\t", `\t`,
"\"", `\"`,
"\\", `\\`,
"<", `\u003c`,
"'", `\u0027`,
}
for i := 0; i < 0x20; i++ {
a = append(a, string([]byte{byte(i)}), fmt.Sprintf(`\u%04x`, i))
}
return a
}()...)
|
