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Lex '\xHH' character constants

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This commit is contained in:
Vincent Burns 2014-01-12 12:53:25 -05:00
commit 2dc91cb4d5
1 changed files with 17 additions and 0 deletions
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17
compiler/c2nim/clex.nim
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@ -382,6 +382,23 @@ proc escape(L: var TLexer, tok: var TToken, allowEmpty=false) =
xi = (xi shl 3) or (ord(L.buf[L.bufpos]) - ord('0'))
inc(L.bufpos)
add(tok.s, chr(xi))
of 'x':
var xi = 0
inc(L.bufpos)
while true:
case L.buf[L.bufpos]
of '0'..'9':
xi = `shl`(xi, 4) or (ord(L.buf[L.bufpos]) - ord('0'))
inc(L.bufpos)
of 'a'..'f':
xi = `shl`(xi, 4) or (ord(L.buf[L.bufpos]) - ord('a') + 10)
inc(L.bufpos)
of 'A'..'F':
xi = `shl`(xi, 4) or (ord(L.buf[L.bufpos]) - ord('A') + 10)
inc(L.bufpos)
else:
break
add(tok.s, chr(xi))
elif not allowEmpty:
lexMessage(L, errInvalidCharacterConstant)