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/* NSC -- new Scala compiler
* Copyright 2005-2009 LAMP/EPFL
* @author Martin Odersky
*/
// $Id$
package scala.tools.nsc.util
import scala.tools.nsc.util.SourceFile.{LF, FF, CR, SU}
class NewCharArrayReader(val buf: RandomAccessSeq[Char], // should not change
decodeUni: Boolean, error: (Int,String) => Unit) extends Iterator[Char] {
private var idx : Int = 0
private var isUnicode0 = false
def isUnicode = isUnicode0
private val bufLength = buf.length
def seek(offset : Int) = {
assert(offset <= bufLength)
idx = offset
}
def offset = idx
def withOffset = new Iterator[(Int,Char)] {
def hasNext = NewCharArrayReader.this.hasNext
def next = (offset, NewCharArrayReader.this.next)
}
override def hasNext = { // could be padded
if (idx == bufLength - 1) buf(idx) != SU
else idx < bufLength
}
override def next : Char = {
isUnicode0 = false
if (!hasNext) return SU
var ch = buf(idx)
idx = idx + 1
ch match {
case CR if buf.safeIs(idx + 1, LF) =>
idx += 1; ch = LF
case LF | FF =>
case '\\' =>
def evenSlashPrefix: Boolean = {
var p = idx - 2
while (p >= 0 && buf(p) == '\\') p = p - 1;
(idx - p) % 2 == 0
}
def udigit: Int = {
val d = digit2int(buf(idx), 16)
if (d >= 0) { idx = idx + 1 }
else if (error != null) error(idx, "error in unicode escape");
d
}
if (idx < bufLength && buf(idx) == 'u' && decodeUni && evenSlashPrefix) {
do {
idx = idx + 1; // nextcol = nextcol + 1;
} while (idx < bufLength && buf(idx) == 'u');
val code = udigit << 12 | udigit << 8 | udigit << 4 | udigit
isUnicode0 = true
ch = code.asInstanceOf[Char]
}
case _ =>
}
ch
}
def digit2int(ch: Char, base: Int): Int = {
if ('0' <= ch && ch <= '9' && ch < '0' + base)
ch - '0'
else if ('A' <= ch && ch < 'A' + base - 10)
ch - 'A' + 10
else if ('a' <= ch && ch < 'a' + base - 10)
ch - 'a' + 10
else
-1
}
}
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