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# -*- coding: utf-8 -*-
#
# File: portato/config_parser.py
# This file is part of the Portato-Project, a graphical portage-frontend.
#
# Copyright (C) 2006 René 'Necoro' Neumann
# This is free software. You may redistribute copies of it under the terms of
# the GNU General Public License version 2.
# There is NO WARRANTY, to the extent permitted by law.
#
# Written by René 'Necoro' Neumann <necoro@necoro.net>
from helper import debug
import re
import types
DELIMITER = ["=", ":"]
COMMENT = [";","#"]
# precompiled expressions
TRUE = re.compile("((true)|(1)|(on)|(wahr)|(ja)|(yes))", re.I)
FALSE = re.compile("((false)|(0)|(off)|(falsch)|(nein)|(no))", re.I)
SECTION = re.compile("\s*\[(\w+)\]\s*")
EXPRESSION = re.compile(r"\s*(\w+)\s*[:=]\s*(.*)\s*")
class Value (object):
"""Class defining a value of a key."""
def __init__ (self, value, line, bool = None):
"""Constructor.
@param value: the value
@type value: string
@param line: the line in the config file
@type line: int
@param bool: boolean meaning of the value
@type bool: boolean"""
self.__value = value
self.line = line
self.boolean = bool
self.changed = False # true if we changed it
self.old = value # keep the original one ... so if we change it back to this one, we do not have to write
def set (self, value):
"""Sets the value to a new one.
@param value: new value
@type value: string"""
self.__value = value
if value != self.old:
self.changed = True
else:
self.changed = False
def get (self):
"""Returns the actual value.
@returns: the actual value
@rtype: string"""
return self.__value
def is_bool (self):
"""Returns whether the actual value has a boolean meaning.
@returns: True if the actual value can be interpreted as a boolean
@rtype: boolean"""
return (self.boolean != None)
def __str__ (self):
return str(self.__value)
def __repr__ (self):
return self.__str__()
value = property(get,set)
class ConfigParser:
"""The newly implemented Config-Parser."""
# generates the complementary true-false-pairs
true_false = {
"true" : "false",
"1" : "0",
"on" : "off",
"yes" : "no",
"ja" : "nein",
"wahr" : "falsch"}
true_false.update(zip(true_false.values(), true_false.keys()))
def __init__ (self, file):
"""Constructor.
@param file: the configuration file to open
@type file: string"""
self.file = file
self.__initialize()
def __initialize (self):
"""Private method which initializes our dictionaries."""
self.vars = {"MAIN": {}}
self.cache = None # file cache
self.pos = {} # stores the positions of the matches
def _invert (self, val):
"""Invertes a given boolean.
@param val: value to invert
@type val: string
@returns: inverted value
@rtype: string"""
return self.true_false[val.lower()]
def parse (self):
"""Parses the file."""
# read into cache
file = open(self.file, "r")
self.cache = file.readlines()
file.close()
# implicit first section is main
section = "MAIN"
count = -1
for line in self.cache:
count += 1
ls = line.strip()
if not ls: continue # empty
if ls[0] in COMMENT: continue # comment
# look for a section
match = SECTION.search(line)
if match:
sec = match.group(1).upper()
if sec != section:
self.vars[sec] = {}
section = sec
continue
# look for an expression
match = EXPRESSION.search(line)
if match:
val = match.group(2)
# find the boolean value
bool = None
if TRUE.match(val):
bool = True
elif FALSE.match(val):
bool = False
# insert
key = match.group(1).lower()
self.vars[section][key] = Value(val, count, bool = bool)
self.pos[count] = match.span(2)
else: # neither comment nor empty nor expression nor section => error
debug("Unrecognized line:",line)
def get (self, key, section = "MAIN"):
"""Returns the value of a given key in a section.
@param key: the key
@type key: string
@param section: the section
@type section: string
@returns: value
@rtype: string
@raises KeyError: if section or key could not be found"""
section = section.upper()
key = key.lower()
return self.vars[section][key].value
def get_boolean (self, key, section = "MAIN"):
"""Returns the boolean value of a given key in a section.
@param key: the key
@type key: string
@param section: the section
@type section: string
@returns: value
@rtype: boolean
@raises KeyError: if section or key could not be found
@raises ValueError: if key does not have a boolean value"""
section = section.upper()
key = key.lower()
val = self.vars[section][key]
if val.is_bool():
return val.boolean
raise ValueError, "\"%s\" is not a boolean." % key
def set (self, key, value = "", section = "MAIN"):
"""Sets a new value of a given key in a section.
@param key: the key
@type key: string
@param value: the new value
@type value: string
@param section: the section
@type section: string
@raises KeyError: if section or key could not be found"""
section = section.upper()
key = key.lower()
self.vars[section][key].value = value
def set_boolean (self, key, value, section = "MAIN"):
"""Sets a new boolean value of a given key in a section.
Therefore it invertes the string representation of the boolean (in lowercase).
@param key: the key
@type key: string
@param value: the new value
@type value: boolean
@param section: the section
@type section: string
@raises KeyError: if section or key could not be found
@raises ValueError: if the old/new value is not a boolean"""
section = section.upper()
key = key.lower()
if not isinstance(value, types.BooleanType):
raise ValueError, "Passed value must be a boolean."
val = self.vars[section][key]
if val.is_bool():
if value is not val.boolean:
val.boolean = value
val.value = self._invert(val.value)
else:
raise ValueError, "\"%s\" is not a boolean." % key
def write (self):
"""Writes file."""
for sec in self.vars:
for key in self.vars[sec]:
val = self.vars[sec][key]
if val.changed:
part1 = self.cache[val.line][:self.pos[val.line][0]] # key+DELIMITER
part2 = val.value # value
part3 = self.cache[val.line][self.pos[val.line][1]:] # everything behind the vale (\n in normal cases)
self.cache[val.line] = part1 + part2 + part3
# write
f = open(self.file, "w")
f.writelines(self.cache)
f.close()
# reload
self.__initialize()
self.parse()
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