1 files changed, 99 insertions, 0 deletions
diff --git a/src/compiler/scala/tools/nsc/util/CharArrayReader.scala b/src/compiler/scala/tools/nsc/util/CharArrayReader.scala
new file mode 100644
index 0000000000..182a730694
--- /dev/null
+++ b/src/compiler/scala/tools/nsc/util/CharArrayReader.scala
@@ -0,0 +1,99 @@
+/* NSC -- new scala compiler
+ * Copyright 2005 LAMP/EPFL
+ * @author  Martin Odersky
+ */
+// $Id$
+package scala.tools.nsc.util;
+
+import scala.tools.nsc.util.SourceFile.{LF, FF, CR, SU}
+
+class CharArrayReader(buf: Array[char], start: int, /* startline: int, startcol: int, */
+                      decodeUni: boolean, error: String => unit) {
+
+  def this(buf: Array[char], decodeUni: boolean, error: String => unit) =
+    this(buf, 0, /* 1, 1, */ decodeUni, error);
+
+  /** layout constant
+   */
+  val tabinc = 8;
+
+  /** the line and column position of the current character
+  */
+  var ch: char = _;
+  var bp = start;
+  //private var cline: int = _;
+  //private var ccol: int = _;
+  def cpos = bp;
+  var isUnicode: boolean = _;
+  var lastLineStartPos: int = 0;
+  var lineStartPos: int = 0;
+  //private var nextline = startline;
+  //private var nextcol = startcol;
+
+  def hasNext: boolean = bp < buf.length;
+
+  def last: char = if(bp > start + 2) buf(bp - 2) else ' '; // XML literals
+
+  def next: unit = {
+    //cline = nextline;
+    //ccol = nextcol;
+    ch = buf(bp);
+    isUnicode = false;
+    bp = bp + 1;
+    ch match {
+      case '\t' =>
+        // nextcol = ((nextcol - 1) / tabinc * tabinc) + tabinc + 1;
+      case CR =>
+        //nextline = nextline + 1;
+        // nextcol = 1;
+        if (buf(bp) == LF) {
+          ch = LF;
+          bp = bp + 1
+        }
+        lastLineStartPos = lineStartPos;
+        lineStartPos = bp;
+      case LF | FF =>
+        lastLineStartPos = lineStartPos;
+        lineStartPos = bp;
+        //nextline = nextline + 1;
+        //nextcol = 1
+      case '\\' =>
+        def evenSlashPrefix: boolean = {
+          var p = bp - 2;
+          while (p >= 0 && buf(p) == '\\') p = p - 1;
+          (bp - p) % 2 == 0
+        }
+        def udigit: int = {
+          val d = digit2int(buf(bp), 16);
+          if (d >= 0) { bp = bp + 1; /* nextcol = nextcol + 1 */ }
+          else error("error in unicode escape");
+          d
+        }
+        // nextcol = nextcol + 1;
+        if (buf(bp) == 'u' && decodeUni && evenSlashPrefix) {
+          do {
+            bp = bp + 1; // nextcol = nextcol + 1;
+          } while (buf(bp) == 'u');
+          val code = udigit << 12 | udigit << 8 | udigit << 4 | udigit;
+          ch = code.asInstanceOf[char];
+          isUnicode = true
+        }
+      case _ =>
+        // nextcol = nextcol + 1
+    }
+  }
+
+  def copy: CharArrayReader =
+    new CharArrayReader(buf, bp, /* nextcol, nextline, */ decodeUni, error);
+
+  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
+  }
+}