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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package strconv
import (
"utf8";
)
const ldigits = "0123456789abcdef"
const udigits = "0123456789ABCDEF"
export func Quote(s string) string {
t := `"`;
for i := 0; i < len(s); i++ {
switch {
case s[i] == '"':
t += `\"`;
case s[i] == '\\':
t += `\\`;
case ' ' <= s[i] && s[i] <= '~':
t += string(s[i]);
case s[i] == '\a':
t += `\a`;
case s[i] == '\b':
t += `\b`;
case s[i] == '\f':
t += `\f`;
case s[i] == '\n':
t += `\n`;
case s[i] == '\r':
t += `\r`;
case s[i] == '\t':
t += `\t`;
case s[i] == '\v':
t += `\v`;
case s[i] < utf8.RuneSelf:
t += `\x` + string(ldigits[s[i]>>4]) + string(ldigits[s[i]&0xF]);
case utf8.FullRuneInString(s, i):
r, size := utf8.DecodeRuneInString(s, i);
if r == utf8.RuneError && size == 1 {
goto EscX;
}
i += size-1; // i++ on next iteration
if r < 0x10000 {
t += `\u`;
for j:=uint(0); j<4; j++ {
t += string(ldigits[(r>>(12-4*j))&0xF]);
}
} else {
t += `\U`;
for j:=uint(0); j<8; j++ {
t += string(ldigits[(r>>(28-4*j))&0xF]);
}
}
default:
EscX:
t += `\x`;
t += string(ldigits[s[i]>>4]);
t += string(ldigits[s[i]&0xF]);
}
}
t += `"`;
return t;
}
export func CanBackquote(s string) bool {
for i := 0; i < len(s); i++ {
if s[i] < ' ' || s[i] == '`' {
return false;
}
}
return true;
}
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