/usr/share/pyshared/ZConfig/cfgparser.py is in python-zconfig 2.9.3-0ubuntu1.
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.
#
##############################################################################
"""Configuration parser."""
import ZConfig
import ZConfig.url
from ZConfig.substitution import isname, substitute
class ZConfigParser:
__metaclass__ = type
__slots__ = ('resource', 'context', 'lineno',
'stack', 'defines', 'file', 'url')
def __init__(self, resource, context, defines=None):
self.resource = resource
self.context = context
self.file = resource.file
self.url = resource.url
self.lineno = 0
self.stack = [] # [(type, name, prevmatcher), ...]
if defines is None:
defines = {}
self.defines = defines
def nextline(self):
line = self.file.readline()
if line:
self.lineno += 1
return False, line.strip()
else:
return True, None
def parse(self, section):
done, line = self.nextline()
while not done:
if line[:1] in ("", "#"):
# blank line or comment
pass
elif line[:2] == "</":
# section end
if line[-1] != ">":
self.error("malformed section end")
section = self.end_section(section, line[2:-1])
elif line[0] == "<":
# section start
if line[-1] != ">":
self.error("malformed section start")
section = self.start_section(section, line[1:-1])
elif line[0] == "%":
self.handle_directive(section, line[1:])
else:
self.handle_key_value(section, line)
done, line = self.nextline()
if self.stack:
self.error("unclosed sections not allowed")
def start_section(self, section, rest):
isempty = rest[-1:] == "/"
if isempty:
rest = rest[:-1]
text = rest.rstrip()
# parse section start stuff here
m = _section_start_rx.match(text)
if not m:
self.error("malformed section header")
type, name = m.group('type', 'name')
type = self._normalize_case(type)
if name:
name = self._normalize_case(name)
try:
newsect = self.context.startSection(section, type, name)
except ZConfig.ConfigurationError, e:
self.error(e[0])
if isempty:
self.context.endSection(section, type, name, newsect)
return section
else:
self.stack.append((type, name, section))
return newsect
def end_section(self, section, rest):
if not self.stack:
self.error("unexpected section end")
type = self._normalize_case(rest.rstrip())
opentype, name, prevsection = self.stack.pop()
if type != opentype:
self.error("unbalanced section end")
try:
self.context.endSection(
prevsection, type, name, section)
except ZConfig.ConfigurationError, e:
self.error(e[0])
return prevsection
def handle_key_value(self, section, rest):
m = _keyvalue_rx.match(rest)
if not m:
self.error("malformed configuration data")
key, value = m.group('key', 'value')
if not value:
value = ''
else:
value = self.replace(value)
try:
section.addValue(key, value, (self.lineno, None, self.url))
except ZConfig.ConfigurationError, e:
self.error(e[0])
def handle_directive(self, section, rest):
m = _keyvalue_rx.match(rest)
if not m:
self.error("missing or unrecognized directive")
name, arg = m.group('key', 'value')
if name not in ("define", "import", "include"):
self.error("unknown directive: " + `name`)
if not arg:
self.error("missing argument to %%%s directive" % name)
if name == "include":
self.handle_include(section, arg)
elif name == "define":
self.handle_define(section, arg)
elif name == "import":
self.handle_import(section, arg)
else:
assert 0, "unexpected directive for " + `"%" + rest`
def handle_import(self, section, rest):
pkgname = self.replace(rest.strip())
self.context.importSchemaComponent(pkgname)
def handle_include(self, section, rest):
rest = self.replace(rest.strip())
newurl = ZConfig.url.urljoin(self.url, rest)
self.context.includeConfiguration(section, newurl, self.defines)
def handle_define(self, section, rest):
parts = rest.split(None, 1)
defname = self._normalize_case(parts[0])
defvalue = ''
if len(parts) == 2:
defvalue = parts[1]
if self.defines.has_key(defname):
if self.defines[defname] != defvalue:
self.error("cannot redefine " + `defname`)
if not isname(defname):
self.error("not a substitution legal name: " + `defname`)
self.defines[defname] = self.replace(defvalue)
def replace(self, text):
try:
return substitute(text, self.defines)
except ZConfig.SubstitutionReplacementError, e:
e.lineno = self.lineno
e.url = self.url
raise
def error(self, message):
raise ZConfig.ConfigurationSyntaxError(message, self.url, self.lineno)
def _normalize_case(self, string):
# This method is factored out solely to allow subclasses to modify
# the behavior of the parser.
return string.lower()
import re
# _name_re does not allow "(" or ")" for historical reasons. Though
# the restriction could be lifted, there seems no need to do so.
_name_re = r"[^\s()]+"
_keyvalue_rx = re.compile(r"(?P<key>%s)\s*(?P<value>[^\s].*)?$"
% _name_re)
_section_start_rx = re.compile(r"(?P<type>%s)"
r"(?:\s+(?P<name>%s))?"
r"$"
% (_name_re, _name_re))
del re
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