def _get_closing_bracket_index(self, index, s, location, lineno):
""" private method used by _replace_vars to count the closing brackets.
Args:
index. The index from where to look for a closing bracket
s. The string to parse
group. group and options that are substituted. Mainly used to create a nice exception message
option. option that is substituted. Mainly used to create a nice exception message
Returns: the index of the found closing bracket
Raises:
exception NoSectionError if the section cannot be found
"""
tolook = s[index + 2:]
opening_brack = 1
closing_brack_index = index + 2
i = 0
for _ch in tolook:
if _ch == ')':
if opening_brack == 1:
return closing_brack_index
else:
opening_brack -= 1
elif _ch == '(':
if tolook[i - 1] == '%':
opening_brack += 1
# inc index
closing_brack_index += 1
i += 1
raise exceptions.SubstitutionError(
lineno, location, "Missing a closing bracket in %s" % (tolook))
def _replace_vars(self, a_str, location, lineno=-1):
""" private replacing all variables. A variable will be in the from of %(group[option]).
Multiple variables are supported, ex /foo/%(group1[opt1])/%(group2[opt2])/bar
Nested variables are also supported, ex /foo/%(group[%(group1[opt1]].
Note that the group part cannot be substituted, only the option can. This is because of the Regular Expression _SUBSGROUPRE that accepts only words as values.
Args:
index. The index from where to look for a closing bracket
s. The string to parse
Returns: the final string with the replacements
Raises:
exception NoSectionError if the section cannot be found
"""
toparse = a_str
index = toparse.find("%(")
# if found opening %( look for end bracket)
if index >= 0:
# look for closing brackets while counting openings one
closing_brack_index = self._get_closing_bracket_index(
index, a_str, location, lineno)
#print "closing bracket %d"%(closing_brack_index)
var = toparse[index:closing_brack_index + 1]
dummy = None
m = self._SUBSGROUPRE.match(var)
if m == None:
raise exceptions.SubstitutionError(
lineno, location,
"Cannot match a group[option] in %s but found an opening bracket (. Malformated expression "
% (var))
else:
# recursive calls
g = self._replace_vars(m.group('group'), location, -1)
o = self._replace_vars(m.group('option'), location, -1)
try:
# if it is in ENVGROUP then check ENV variables with a Resource object
# if it is in CLIGROUP then check CLI argument with a Resource object
# otherwise check in standard groups
if g == Conf._ENVGROUP:
r = Resource(CliArgument=None, EnvVariable=o)
dummy = r.getValue()
elif g == Conf._CLIGROUP:
r = Resource(CliArgument=o, EnvVariable=None)
dummy = r.getValue()
else:
dummy = self._sections[g][self.optionxform(o)]
except KeyError, _: #IGNORE:W0612
raise exceptions.SubstitutionError(
lineno, location,
"Property %s[%s] doesn't exist in this configuration file \n"
% (g, o))
toparse = toparse.replace(var, dummy)
return self._replace_vars(toparse, location, -1)