1 files changed, 57 insertions, 0 deletions
diff --git a/src/py/javatoolkit/parser/helpers.py b/src/py/javatoolkit/parser/helpers.py
new file mode 100644
index 0000000..b11b08b
--- /dev/null
+++ b/src/py/javatoolkit/parser/helpers.py
@@ -0,0 +1,57 @@
+# Copyright(c) 2006, James Le Cuirot <chewi@aura-online.co.uk>
+# Copyright(c) 2004, Karl Trygve Kalleberg <karltk@gentoo.org>
+# Copyright(c) 2004, Gentoo Foundation
+#
+# Licensed under the GNU General Public License, v2
+#
+# $Header: $
+
+def expand(root, expr, realroot = None):
+    """Evaluates a path expression on a given tree.
+
+    @param root - the root of the tree
+    @param expr - the expression to resolve
+
+    @return the expanded string
+    """
+
+    if realroot == None:
+        realroot = root
+
+    expanded = ""
+    in_varref = False
+    varname = ""
+
+    for i in range(len(expr)):
+        x = expr[i]
+
+        if in_varref:
+
+            if x == "}":
+                in_varref = False
+                expanded += expand(root, realroot.find_node(varname).value, realroot)
+                varname = ""
+            elif x != "{":
+                varname += expr[i]
+
+        elif x == "$" and i < len(expr) and expr[i + 1] == "{":
+            in_varref = True
+
+        else:
+            expanded += x
+
+    return expanded
+
+def strip_varmarker(s):
+    """Strips away ${ and } in a variable expression. Idempotent if marker not found.
+
+    Example: "${foo}" -> "foo"
+    Example: "foo" -> "foo"
+    """
+
+    if s.startswith("${") and s.endswith("}"):
+        return s[2:-1]
+
+    return s
+
+# vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4 nowrap: