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#!/usr/bin/env python
# ex:ts=4:sw=4:sts=4:et
# -*- tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*-
"""
class for handling configuration data files
Reads a .conf file and obtains its metadata
"""
# Copyright (C) 2003, 2004 Chris Larson
# Copyright (C) 2003, 2004 Phil Blundell
#
# 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 re, bb.data, os
import bb.utils
from bb.parse import ParseError, resolve_file, ast
#__config_regexp__ = re.compile( r"(?P<exp>export\s*)?(?P<var>[a-zA-Z0-9\-_+.${}]+)\s*(?P<colon>:)?(?P<ques>\?)?=\s*(?P<apo>['\"]?)(?P<value>.*)(?P=apo)$")
__config_regexp__ = re.compile( r"(?P<exp>export\s*)?(?P<var>[a-zA-Z0-9\-_+.${}/]+)(\[(?P<flag>[a-zA-Z0-9\-_+.]+)\])?\s*((?P<colon>:=)|(?P<lazyques>\?\?=)|(?P<ques>\?=)|(?P<append>\+=)|(?P<prepend>=\+)|(?P<predot>=\.)|(?P<postdot>\.=)|=)\s*(?P<apo>['\"]?)(?P<value>.*)(?P=apo)$")
__include_regexp__ = re.compile( r"include\s+(.+)" )
__require_regexp__ = re.compile( r"require\s+(.+)" )
__export_regexp__ = re.compile( r"export\s+(.+)" )
def init(data):
topdir = bb.data.getVar('TOPDIR', data)
if not topdir:
topdir = os.getcwd()
bb.data.setVar('TOPDIR', topdir, data)
if not bb.data.getVar('BBPATH', data):
bb.msg.fatal(bb.msg.domain.Parsing, "The BBPATH environment variable must be set")
def supports(fn, d):
return fn[-5:] == ".conf"
def include(oldfn, fn, data, error_out):
"""
error_out If True a ParseError will be reaised if the to be included
"""
if oldfn == fn: # prevent infinate recursion
return None
import bb
fn = bb.data.expand(fn, data)
oldfn = bb.data.expand(oldfn, data)
if not os.path.isabs(fn):
dname = os.path.dirname(oldfn)
bbpath = "%s:%s" % (dname, bb.data.getVar("BBPATH", data, 1))
abs_fn = bb.utils.which(bbpath, fn)
if abs_fn:
fn = abs_fn
from bb.parse import handle
try:
ret = handle(fn, data, True)
except IOError:
if error_out:
raise ParseError("Could not %(error_out)s file %(fn)s" % vars() )
bb.msg.debug(2, bb.msg.domain.Parsing, "CONF file '%s' not found" % fn)
def handle(fn, data, include):
init(data)
if include == 0:
oldfile = None
else:
oldfile = bb.data.getVar('FILE', data)
abs_fn = resolve_file(fn, data)
f = open(abs_fn, 'r')
if include:
bb.parse.mark_dependency(data, abs_fn)
statements = ast.StatementGroup()
lineno = 0
while 1:
lineno = lineno + 1
s = f.readline()
if not s: break
w = s.strip()
if not w: continue # skip empty lines
s = s.rstrip()
if s[0] == '#': continue # skip comments
while s[-1] == '\\':
s2 = f.readline()[:-1].strip()
lineno = lineno + 1
s = s[:-1] + s2
feeder(lineno, s, fn, statements)
# DONE WITH PARSING... time to evaluate
bb.data.setVar('FILE', fn, data)
statements.eval(data)
if oldfile:
bb.data.setVar('FILE', oldfile, data)
return data
def feeder(lineno, s, fn, statements):
m = __config_regexp__.match(s)
if m:
groupd = m.groupdict()
ast.handleData(statements, groupd)
return
m = __include_regexp__.match(s)
if m:
ast.handleInclude(statements, m, fn, lineno, False)
return
m = __require_regexp__.match(s)
if m:
ast.handleInclude(statements, m, fn, lineno, True)
return
m = __export_regexp__.match(s)
if m:
ast.handleExport(statements, m)
return
raise ParseError("%s:%d: unparsed line: '%s'" % (fn, lineno, s));
# Add us to the handlers list
from bb.parse import handlers
handlers.append({'supports': supports, 'handle': handle, 'init': init})
del handlers
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