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# Copyright (C) 2008-2011 Dejan Muhamedagic <dmuhamedagic@suse.de>
# See COPYING for license information.
import os
import re
from . import config
from . import userdir
from . import log
logger = log.setup_logger(__name__)
def get_var(l, key):
for s in l:
a = s.split()
if len(a) == 2 and a[0] == key:
return a[1]
return ''
def chk_var(l, key):
for s in l:
a = s.split()
if len(a) == 2 and a[0] == key and a[1]:
return True
return False
def chk_key(l, key):
for s in l:
a = s.split()
if len(a) >= 1 and a[0] == key:
return True
return False
def validate_template(l):
'Test for required stuff in a template.'
if not chk_var(l, '%name'):
logger.error("invalid template: missing '%name'")
return False
if not chk_key(l, '%generate'):
logger.error("invalid template: missing '%generate'")
return False
g = l.index('%generate')
if not (chk_key(l[0:g], '%required') or chk_key(l[0:g], '%optional')):
logger.error("invalid template: missing '%required' or '%optional'")
return False
return True
def fix_tmpl_refs(l, ident, pfx):
for i, tmpl in enumerate(l):
l[i] = tmpl.replace(ident, pfx)
def fix_tmpl_refs_re(l, regex, repl):
for i, tmpl in enumerate(l):
l[i] = re.sub(regex, repl, tmpl)
class LoadTemplate(object):
'''
Load a template and its dependencies, generate a
configuration file which should be relatively easy and
straightforward to parse.
'''
edit_instructions = '''# Edit instructions:
#
# Add content only at the end of lines starting with '%%'.
# Only add content, don't remove or replace anything.
# The parameters following '%required' are not optional,
# unlike those following '%optional'.
# You may also add comments for future reference.'''
no_more_edit = '''# Don't edit anything below this line.'''
def __init__(self, name):
self.name = name
self.all_pre_gen = []
self.all_post_gen = []
self.all_pfx = []
def new_pfx(self, name):
i = 1
pfx = name
while pfx in self.all_pfx:
pfx = "%s_%d" % (name, i)
i += 1
self.all_pfx.append(pfx)
return pfx
def generate(self):
return '\n'.join(
["# Configuration: %s" % self.name,
'',
self.edit_instructions,
'',
'\n'.join(self.all_pre_gen),
self.no_more_edit,
'',
'%generate',
'\n'.join(self.all_post_gen)])
def write_config(self, name):
try:
f = open("%s/%s" % (userdir.CRMCONF_DIR, name), "w")
except IOError as msg:
logger.error("open: %s", msg)
return False
print(self.generate(), file=f)
f.close()
return True
def load_template(self, tmpl):
try:
l = open(os.path.join(config.path.sharedir, 'templates', tmpl)).read().split('\n')
except IOError as msg:
logger.error("open: %s", msg)
return ''
if not validate_template(l):
return ''
logger.info("pulling in template %s", tmpl)
g = l.index('%generate')
pre_gen = l[0:g]
post_gen = l[g+1:]
name = get_var(pre_gen, '%name')
for s in l[0:g]:
if s.startswith('%depends_on'):
a = s.split()
if len(a) != 2:
logger.warning("%s: wrong usage", s)
continue
tmpl_id = a[1]
tmpl_pfx = self.load_template(a[1])
if tmpl_pfx:
fix_tmpl_refs(post_gen, '%'+tmpl_id, '%'+tmpl_pfx)
pfx = self.new_pfx(name)
fix_tmpl_refs(post_gen, '%_:', '%'+pfx+':')
# replace remaining %_, it may be useful at times
fix_tmpl_refs(post_gen, '%_', pfx)
v_idx = pre_gen.index('%required') or pre_gen.index('%optional')
pre_gen.insert(v_idx, '%pfx ' + pfx)
self.all_pre_gen += pre_gen
self.all_post_gen += post_gen
return pfx
def post_process(self, params):
pfx_re = '(%s)' % '|'.join(self.all_pfx)
for n in params:
fix_tmpl_refs(self.all_pre_gen, '%% '+n, "%% "+n+" "+params[n])
fix_tmpl_refs_re(self.all_post_gen,
'%' + pfx_re + '([^:]|$)', r'\1\2')
# process %if ... [%else] ... %fi
rmidx_l = []
if_seq = False
outcome = False # unnecessary, but to appease lints
for i in range(len(self.all_post_gen)):
s = self.all_post_gen[i]
if if_seq:
a = s.split()
if len(a) >= 1 and a[0] == '%fi':
if_seq = False
rmidx_l.append(i)
elif len(a) >= 1 and a[0] == '%else':
outcome = not outcome
rmidx_l.append(i)
else:
if not outcome:
rmidx_l.append(i)
continue
if not s:
continue
a = s.split()
if len(a) == 2 and a[0] == '%if':
outcome = not a[1].startswith('%') # not replaced -> false
if_seq = True
rmidx_l.append(i)
rmidx_l.reverse()
for i in rmidx_l:
del self.all_post_gen[i]
# vim:ts=4:sw=4:et:
|
