/usr/lib/python2.7/dist-packages/ZConfig/substitution.py is in python-zconfig 3.1.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# Copyright (c) 2002, 2003 Zope Foundation and Contributors.
# All Rights Reserved.
#
# This software is subject to the provisions of the Zope Public License,
# Version 2.1 (ZPL). A copy of the ZPL should accompany this distribution.
# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
# FOR A PARTICULAR PURPOSE.
#
##############################################################################
"""Substitution support for ZConfig values."""
import os
import ZConfig
def substitute(s, mapping):
"""Interpolate variables from `mapping` into `s`."""
if "$" in s:
result = ''
rest = s
while rest:
p, name, namecase, rest, vtype = _split(rest)
result += p
if name:
v = None
if vtype == 'define':
v = mapping.get(name)
if vtype == 'env':
v = os.getenv(namecase)
if v is None:
raise ZConfig.SubstitutionReplacementError(s, namecase)
result += v
return result
else:
return s
def isname(s):
"""Return True iff s is a valid substitution name."""
m = _name_match(s)
if m:
return m.group() == s
else:
return False
def _split(s):
# Return a four tuple: prefix, name, namecase, suffix
# - prefix is text that can be used literally in the result (may be '')
# - name is a referenced name, or None
# - namecase is the name with case preserved
# - suffix is trailling text that may contain additional references
# (may be '' or None)
if "$" in s:
i = s.find("$")
c = s[i+1:i+2]
if c == "":
raise ZConfig.SubstitutionSyntaxError(
"illegal lone '$' at end of source")
if c == "$":
return s[:i+1], None, None, s[i+2:], None
prefix = s[:i]
vtype = 'define'
if c == "{":
m = _name_match(s, i + 2)
if not m:
raise ZConfig.SubstitutionSyntaxError(
"'${' not followed by name")
name = m.group(0)
i = m.end() + 1
if not s.startswith("}", i - 1):
raise ZConfig.SubstitutionSyntaxError(
"'${%s' not followed by '}'" % name)
elif c == "(":
m = _name_match(s, i + 2)
if not m:
raise ZConfig.SubstitutionSyntaxError(
"'$(' not followed by name")
name = m.group(0)
i = m.end() + 1
if not s.startswith(")", i - 1):
raise ZConfig.SubstitutionSyntaxError(
"'$(%s' not followed by ')'" % name)
vtype = 'env'
else:
m = _name_match(s, i+1)
if not m:
raise ZConfig.SubstitutionSyntaxError(
"'$' not followed by '$' or name")
name = m.group(0)
i = m.end()
return prefix, name.lower(), name, s[i:], vtype
else:
return s, None, None, None, None
import re
_name_match = re.compile(r"[a-zA-Z_][a-zA-Z0-9_]*").match
del re
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