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github.com_openSUSE_osc/osc/OscConfigParser.py

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# Copyright 2008,2009 Marcus Huewe <suse-tux@gmx.de>
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License version 2
# as published by the Free Software Foundation;
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
import ConfigParser
import re
# inspired from http://code.google.com/p/iniparse/ - although their implementation is
# quite different
class ConfigLineOrder:
"""
A ConfigLineOrder() instance task is to preserve the order of a config file.
It keeps track of all lines (including comments) in the _lines list. This list
either contains SectionLine() instances or CommentLine() instances.
"""
def __init__(self):
self._lines = []
def _append(self, line_obj):
self._lines.append(line_obj)
def _find_section(self, section):
for line in self._lines:
if line.type == 'section' and line.name == section:
return line
return None
def add_section(self, sectname):
self._append(SectionLine(sectname))
def get_section(self, sectname):
section = self._find_section(sectname)
if section:
return section
section = SectionLine(sectname)
self._append(section)
return section
def add_other(self, sectname, line):
if sectname:
self.get_section(sectname).add_other(line)
else:
self._append(CommentLine(line))
def keys(self):
return [ i.name for i in self._lines if i.type == 'section' ]
def __setitem__(self, key, value):
section = SectionLine(key)
self._append(section)
def __getitem__(self, key):
section = self._find_section(key)
if not section:
raise KeyError()
return section
def __delitem__(self, key):
line = self._find(line)
if not line:
raise KeyError(key)
self._lines.remove(line)
def __iter__(self):
#return self._lines.__iter__()
for line in self._lines:
if line.type == 'section':
yield line.name
raise StopIteration()
class Line:
"""Base class for all line objects"""
def __init__(self, name, type):
self.name = name
self.type = type
class SectionLine(Line):
"""
This class represents a [section]. It stores all lines which belongs to
this certain section in the _lines list. The _lines list either contains
CommentLine() or OptionLine() instances.
"""
def __init__(self, sectname, dict = {}):
Line.__init__(self, sectname, 'section')
self._lines = []
self._dict = dict
def _find(self, name):
for line in self._lines:
if line.name == name:
return line
return None
def _add_option(self, optname, value = None, line = None, sep = '='):
if value is None and line is None:
raise ConfigParser.Error('Either value or line must be passed in')
elif value and line:
raise ConfigParser.Error('value and line are mutually exclusive')
if value is not None:
line = '%s%s%s' % (optname, sep, value)
opt = self._find(optname)
if opt:
opt.format(line)
else:
self._lines.append(OptionLine(optname, line))
def add_other(self, line):
self._lines.append(CommentLine(line))
def copy(self):
return dict(self.items())
def items(self):
return [ (i.name, i.value) for i in self._lines if i.type == 'option' ]
def keys(self):
return [ i.name for i in self._lines ]
def __setitem__(self, key, val):
self._add_option(key, val)
def __getitem__(self, key):
line = self._find(key)
if not line:
raise KeyError(key)
return str(line)
def __delitem__(self, key):
line = self._find(key)
if not line:
raise KeyError(key)
self._lines.remove(line)
def __str__(self):
return self.name
# XXX: needed to support 'x' in cp._sections['sectname']
def __iter__(self):
for line in self._lines:
yield line.name
raise StopIteration()
class CommentLine(Line):
"""Store a commentline"""
def __init__(self, line):
Line.__init__(self, line.strip('\n'), 'comment')
def __str__(self):
return self.name
class OptionLine(Line):
"""
This class represents an option. The class' "name" attribute is used
to store the option's name and the "value" attribute contains the option's
value. The "frmt" attribute preserves the format which was used in the configuration
file.
Example:
optionx:<SPACE><SPACE>value
=> self.frmt = '%s:<SPACE><SPACE>%s'
optiony<SPACE>=<SPACE>value<SPACE>;<SPACE>some_comment
=> self.frmt = '%s<SPACE>=<SPACE><SPACE>%s<SPACE>;<SPACE>some_comment
"""
def __init__(self, optname, line):
Line.__init__(self, optname, 'option')
self.name = optname
self.format(line)
def format(self, line):
mo = ConfigParser.ConfigParser.OPTCRE.match(line.strip())
key, val = mo.group('option', 'value')
self.frmt = line.replace(key.strip(), '%s', 1)
pos = val.find(' ;')
if pos >= 0:
val = val[:pos]
self.value = val
self.frmt = self.frmt.replace(val.strip(), '%s', 1).rstrip('\n')
def __str__(self):
return self.value
class OscConfigParser(ConfigParser.SafeConfigParser):
"""
OscConfigParser() behaves like a normal ConfigParser() object. The
only differences is that it preserves the order+format of configuration entries
and that it stores comments.
In order to keep the order and the format it makes use of the ConfigLineOrder()
class.
"""
def __init__(self, defaults={}):
ConfigParser.SafeConfigParser.__init__(self, defaults)
self._sections = ConfigLineOrder()
# XXX: unfortunately we have to override the _read() method from the ConfigParser()
# class because a) we need to store comments b) the original version doesn't use
# the its set methods to add and set sections, options etc. instead they use a
# dictionary (this makes it hard for subclasses to use their own objects, IMHO
# a bug) and c) in case of an option we need the complete line to store the format.
# This all sounds complicated but it isn't - we only needed some slight changes
def _read(self, fp, fpname):
"""Parse a sectioned setup file.
The sections in setup file contains a title line at the top,
indicated by a name in square brackets (`[]'), plus key/value
options lines, indicated by `name: value' format lines.
Continuations are represented by an embedded newline then
leading whitespace. Blank lines, lines beginning with a '#',
and just about everything else are ignored.
"""
cursect = None # None, or a dictionary
optname = None
lineno = 0
e = None # None, or an exception
while True:
line = fp.readline()
if not line:
break
lineno = lineno + 1
# comment or blank line?
if line.strip() == '' or line[0] in '#;':
self._sections.add_other(cursect, line)
continue
if line.split(None, 1)[0].lower() == 'rem' and line[0] in "rR":
# no leading whitespace
continue
# continuation line?
if line[0].isspace() and cursect is not None and optname:
value = line.strip()
if value:
#cursect[optname] = "%s\n%s" % (cursect[optname], value)
#self.set(cursect, optname, "%s\n%s" % (self.get(cursect, optname), value))
if cursect == ConfigParser.DEFAULTSECT:
self._defaults[optname] = "%s\n%s" % (self._defaults[optname], value)
else:
# use the raw value here (original version uses raw=False)
self._sections[cursect]._find(optname).value = '%s\n%s' % (self.get(cursect, optname, raw=True), value)
# a section header or option header?
else:
# is it a section header?
mo = self.SECTCRE.match(line)
if mo:
sectname = mo.group('header')
if sectname in self._sections:
cursect = self._sections[sectname]
elif sectname == ConfigParser.DEFAULTSECT:
cursect = self._defaults
else:
#cursect = {'__name__': sectname}
#self._sections[sectname] = cursect
self.add_section(sectname)
self.set(sectname, '__name__', sectname)
# So sections can't start with a continuation line
cursect = sectname
optname = None
# no section header in the file?
elif cursect is None:
raise ConfigParser.MissingSectionHeaderError(fpname, lineno, line)
# an option line?
else:
mo = self.OPTCRE.match(line)
if mo:
optname, vi, optval = mo.group('option', 'vi', 'value')
if vi in ('=', ':') and ';' in optval:
# ';' is a comment delimiter only if it follows
# a spacing character
pos = optval.find(';')
if pos != -1 and optval[pos-1].isspace():
optval = optval[:pos]
optval = optval.strip()
# allow empty values
if optval == '""':
optval = ''
optname = self.optionxform(optname.rstrip())
if cursect == ConfigParser.DEFAULTSECT:
self._defaults[optname] = optval
else:
self._sections[cursect]._add_option(optname, line=line)
else:
# a non-fatal parsing error occurred. set up the
# exception but keep going. the exception will be
# raised at the end of the file and will contain a
# list of all bogus lines
if not e:
e = ConfigParser.ParsingError(fpname)
e.append(lineno, repr(line))
# if any parsing errors occurred, raise an exception
if e:
raise e
def write(self, fp, comments = False):
"""
write the configuration file. If comments is True all comments etc.
will be written to fp otherwise the ConfigParsers' default write method
will be called.
"""
if comments:
fp.write(str(self))
fp.write('\n')
else:
ConfigParser.SafeConfigParser.write(self, fp)
# XXX: simplify!
def __str__(self):
ret = []
first = True
for line in self._sections._lines:
if line.type == 'section':
if first:
first = False
else:
ret.append('')
ret.append('[%s]' % line.name)
for sline in line._lines:
if sline.name == '__name__':
continue
if sline.type == 'option':
ret.append(sline.frmt % (sline.name, sline.value))
elif str(sline) != '':
ret.append(str(sline))
else:
ret.append(str(line))
return '\n'.join(ret)
# vim: sw=4 et
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