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LiteralEncoding.scala
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object LiteralEncoding { | |
private val Hex = "0123456789abcdef".toArray | |
private val StringEscapes = { | |
val escapes = Map( | |
'\b' -> 'b', // backspace | |
'\t' -> 't', // tab | |
'\n' -> 'n', // linefeed | |
'\f' -> 'f', // formfeed | |
'\r' -> 'r', // carriage return | |
'\\' -> '\\', // backslash | |
'"' -> '"' | |
) | |
(Array.fill('\\'.toInt + 1)('\u0000') /: escapes) { (a, e) => a(e._1) = e._2; a } | |
} | |
def encode(str: String): String = | |
encode(str, new StringBuilder(str.length + 2)).toString | |
def encode(str: String, sb: StringBuilder): StringBuilder = { | |
if(null == str) return sb.append("null"); | |
sb.append('"') | |
for(c <- str) { | |
if(c <= StringEscapes.length && '\u0000' != StringEscapes(c)) | |
sb.append('\\').append(StringEscapes(c)) | |
else if('~' >= c && c >= ' ') | |
sb.append(c) | |
else { | |
sb.append('\\').append('u') | |
.append(Hex(c >>> 12 & 0xF)) | |
.append(Hex(c >>> 8 & 0xF)) | |
.append(Hex(c >>> 4 & 0xF)) | |
.append(Hex(c & 0xF)) | |
} | |
} | |
sb.append('"') | |
} | |
} |
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