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# 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:
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