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package java.io
class StringReader(s: String) extends Reader {
private[this] var closed = false
private[this] var pos = 0
private[this] var mark = 0
override def close(): Unit = {
closed = true
}
override def mark(readAheadLimit: Int): Unit = {
ensureOpen()
mark = pos
}
override def markSupported(): Boolean = true
override def read(): Int = {
ensureOpen()
if (pos < s.length) {
val res = s.charAt(pos).toInt
pos += 1
res
} else -1
}
override def read(cbuf: Array[Char], off: Int, len: Int): Int = {
ensureOpen()
if (off < 0 || len < 0 || len > cbuf.length - off)
throw new IndexOutOfBoundsException
if (len == 0) 0
else {
val count = Math.min(len, s.length - pos)
var i = 0
while (i < count) {
cbuf(off + i) = s.charAt(pos + i)
i += 1
}
pos += count
count
}
}
override def ready(): Boolean = pos < s.length
override def reset(): Unit = {
ensureOpen()
pos = mark
}
override def skip(ns: Long): Long = {
// Apparently, StringReader.skip allows negative skips
val count = Math.max(Math.min(ns, s.length - pos).toInt, -pos)
pos += count
count.toLong
}
private def ensureOpen(): Unit = {
if (closed)
throw new IOException("Operation on closed stream")
}
}
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