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|
package graphql
import (
"fmt"
"io"
"strconv"
)
const encodeHex = "0123456789ABCDEF"
func MarshalString(s string) Marshaler {
return WriterFunc(func(w io.Writer) {
start := 0
io.WriteString(w, `"`)
for i, c := range s {
if c < 0x20 || c == '\\' || c == '"' {
io.WriteString(w, s[start:i])
switch c {
case '\t':
io.WriteString(w, `\t`)
case '\r':
io.WriteString(w, `\r`)
case '\n':
io.WriteString(w, `\n`)
case '\\':
io.WriteString(w, `\\`)
case '"':
io.WriteString(w, `\"`)
default:
io.WriteString(w, `\u00`)
w.Write([]byte{encodeHex[c>>4], encodeHex[c&0xf]})
}
start = i + 1
}
}
io.WriteString(w, s[start:])
io.WriteString(w, `"`)
})
}
func UnmarshalString(v interface{}) (string, error) {
switch v := v.(type) {
case string:
return v, nil
case int:
return strconv.Itoa(v), nil
case float64:
return fmt.Sprintf("%f", v), nil
case bool:
if v {
return "true", nil
} else {
return "false", nil
}
case nil:
return "null", nil
default:
return "", fmt.Errorf("%T is not a string", v)
}
}
|
