1 files changed, 54 insertions, 0 deletions
diff --git a/sources/scalac/util/Position.java b/sources/scalac/util/Position.java
new file mode 100644
index 0000000000..c2cd7f72d3
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+++ b/sources/scalac/util/Position.java
@@ -0,0 +1,54 @@
+/*     ____ ____  ____ ____  ______                                     *\
+**    / __// __ \/ __// __ \/ ____/    SOcos COmpiles Scala             **
+**  __\_ \/ /_/ / /__/ /_/ /\_ \       (c) 2002, LAMP/EPFL              **
+** /_____/\____/\___/\____/____/                                        **
+**                                                                      **
+** $Id$
+\*                                                                      */
+
+package scalac.util;
+
+
+public final class Position {
+
+/** source file positions are integers in the format:
+ *     line-number << LINESHIFT + column-number
+ *  NOPOS represents an undefined position.
+ */
+    public static final int LINESHIFT    = 10;
+    public static final int FILESHIFT    = 26;
+    public static final int COLUMNMASK   = 1023;
+    public static final int LINEMASK     = 0xffff;
+
+/** predefined positions
+ */
+    public static final int NOPOS        = 0;
+
+/** first position in a source file
+ */
+    public static final int FIRSTPOS     = (1 << LINESHIFT) + 1;
+
+/** encode a line and column number into a single int
+ */
+    public static int encode(int line, int col, int file) {
+        return (file << FILESHIFT) | (line << LINESHIFT) | col;
+    }
+
+/** get the file id of an encoded position
+ */
+    public static int file(int pos) {
+        return pos >>> FILESHIFT;
+    }
+
+/** get the line number out of an encoded position
+ */
+    public static int line(int pos) {
+        return (pos >>> LINESHIFT) & LINEMASK;
+    }
+
+/** return the column number of an encoded position
+ */
+    public static int column(int pos) {
+        return pos & COLUMNMASK;
+    }
+}