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package parse
import (
"bytes"
"unicode"
)
// Quote returns a representation of s in elvish syntax. Bareword is tried
// first, then single quoted string and finally double quoted string.
func Quote(s string) string {
s, _ = QuoteAs(s, Bareword)
return s
}
// QuoteAs returns a representation of s in elvish syntax, using the syntax
// specified by q, which must be one of Bareword, SingleQuoted, or
// DoubleQuoted. It returns the quoted string and the actual quoting.
func QuoteAs(s string, q PrimaryType) (string, PrimaryType) {
if q == DoubleQuoted {
// Everything can be quoted using double quotes, return directly.
return quoteDouble(s), DoubleQuoted
}
if s == "" {
return "''", SingleQuoted
}
// Keep track of whether it is a valid bareword.
bare := s[0] != '~'
for _, r := range s {
if !unicode.IsPrint(r) {
// Contains unprintable character; force double quote.
return quoteDouble(s), DoubleQuoted
}
if !allowedInBareword(r, strictExpr) {
bare = false
}
}
if q == Bareword && bare {
return s, Bareword
}
return quoteSingle(s), SingleQuoted
}
func quoteSingle(s string) string {
var buf bytes.Buffer
buf.WriteByte('\'')
for _, r := range s {
buf.WriteRune(r)
if r == '\'' {
buf.WriteByte('\'')
}
}
buf.WriteByte('\'')
return buf.String()
}
func rtohex(r rune, w int) []byte {
bytes := make([]byte, w)
for i := w - 1; i >= 0; i-- {
d := byte(r % 16)
r /= 16
if d <= 9 {
bytes[i] = '0' + d
} else {
bytes[i] = 'a' + d - 10
}
}
return bytes
}
func quoteDouble(s string) string {
var buf bytes.Buffer
buf.WriteByte('"')
for _, r := range s {
if e, ok := doubleUnescape[r]; ok {
// Takes care of " and \ as well.
buf.WriteByte('\\')
buf.WriteRune(e)
} else if !unicode.IsPrint(r) {
buf.WriteByte('\\')
if r <= 0xff {
buf.WriteByte('x')
buf.Write(rtohex(r, 2))
} else if r <= 0xffff {
buf.WriteByte('u')
buf.Write(rtohex(r, 4))
} else {
buf.WriteByte('U')
buf.Write(rtohex(r, 8))
}
} else {
buf.WriteRune(r)
}
}
buf.WriteByte('"')
return buf.String()
}
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