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/* NSC -- new Scala compiler
* Copyright 2005-2013 LAMP/EPFL
* @author Martin Odersky
*/
package scala
package tools.nsc
package util
import scala.reflect.internal.Chars._
class JavaCharArrayReader(buf: IndexedSeq[Char], start: Int, /* startline: int, startcol: int, */
decodeUni: Boolean, error: String => Unit) extends Iterator[Char] with Cloneable {
def this(buf: IndexedSeq[Char], decodeUni: Boolean, error: String => Unit) =
this(buf, 0, /* 1, 1, */ decodeUni, error)
/** the line and column position of the current character
*/
var ch: Char = _
var bp = start
def cpos = bp
var isUnicode: Boolean = _
def hasNext = bp < buf.length
def next(): Char = {
val buf = this.buf.asInstanceOf[collection.mutable.WrappedArray[Char]].array
if(!hasNext) {
ch = SU
return SU // there is an endless stream of SU's at the end
}
ch = buf(bp)
isUnicode = false
bp = bp + 1
ch match {
case '\t' =>
case CR =>
if (bp < buf.length && buf(bp) == LF) {
ch = LF
bp += 1
}
case LF | FF =>
case '\\' =>
def evenSlashPrefix: Boolean = {
var p = bp - 2
while (p >= 0 && buf(p) == '\\') p -= 1
(bp - p) % 2 == 0
}
def udigit: Int = {
val d = digit2int(buf(bp), 16)
if (d >= 0) bp += 1
else error("error in unicode escape")
d
}
if (buf(bp) == 'u' && decodeUni && evenSlashPrefix) {
do {
bp += 1 //; nextcol += 1
} while (buf(bp) == 'u')
val code = udigit << 12 | udigit << 8 | udigit << 4 | udigit
ch = code.asInstanceOf[Char]
isUnicode = true
}
case _ =>
}
ch
}
def copy: JavaCharArrayReader =
new JavaCharArrayReader(buf, bp, /* nextcol, nextline, */ decodeUni, error)
}
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