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#!/usr/bin/env python
import re
import sys
import os
from pprint import pformat, pprint
class DEFUN(object):
def __init__(self, lines):
# name, name_cmd, command_string, help_strings, guts):
self.name = None
self.name_cmd = None
self.command_string = None
self.help_strings = []
self.guts = []
self.aliases = []
'''
DEFUN (no_bgp_maxmed_onstartup,
no_bgp_maxmed_onstartup_cmd,
"no bgp max-med on-startup",
NO_STR
BGP_STR
"Advertise routes with max-med\n"
"Effective on a startup\n")
'''
state = 'HEADER'
for (line_number, line) in enumerate(lines):
if state == 'HEADER':
if line_number == 0:
re_name = re.search('DEFUN \((.*),', line.strip())
self.name = re_name.group(1)
elif line_number == 1:
self.name_cmd = line.strip()[0:-1] # chop the trailing comma
elif line_number == 2:
self.command_string = line
state = 'HELP'
elif state == 'HELP':
if line.strip() == '{':
self.guts.append(line)
state = 'BODY'
else:
self.help_strings.append(line)
elif state == 'BODY':
if line.rstrip() == '}':
self.guts.append(line)
state = None
else:
self.guts.append(line)
else:
raise Exception("invalid state %s" % state)
# print "%d %7s: %s" % (line_number, state, line.rstrip())
assert self.command_string, "No command string for\n%s" % pformat(lines)
def __str__(self):
return self.name
def dump(self):
lines = []
if self.aliases:
lines.append("/*\n")
lines.append(" * CHECK ME - The following ALIASes need to be implemented in this DEFUN\n")
for alias in self.aliases:
lines.append(" * %s\n" % alias.command_string.strip())
for line in alias.help_strings:
lines.append(" * %s\n" % line)
lines.append(" *\n")
lines.append(" */\n")
lines.append("DEFUN (%s,\n" % self.name)
lines.append(" %s,\n" % self.name_cmd)
lines.append(self.command_string)
lines.extend(self.help_strings)
lines.extend(self.guts)
return ''.join(lines)
class ALIAS(object):
def __init__(self, lines):
self.name = None
self.name_cmd = None
self.command_string = None
self.help_strings = []
'''
ALIAS (no_bgp_maxmed_onstartup,
no_bgp_maxmed_onstartup_period_cmd,
"no bgp max-med on-startup <5-86400>",
NO_STR
BGP_STR
"Advertise routes with max-med\n"
"Effective on a startup\n"
"Time (seconds) period for max-med\n")
'''
state = 'HEADER'
for (line_number, line) in enumerate(lines):
if state == 'HEADER':
if line_number == 0:
re_name = re.search('ALIAS \((.*),', line)
try:
self.name = re_name.group(1)
except AttributeError:
pprint(lines)
raise
elif line_number == 1:
self.name_cmd = line.strip()[0:-1] # chop the trailing comma
elif line_number == 2:
self.command_string = line
state = 'HELP'
elif state == 'HELP':
if line.strip() == '{':
raise Exception("should not see { in an ALIAS")
else:
line = line.strip()
if line.endswith(')'):
line = line[0:-1] # strip the trailing )
self.help_strings.append(line)
else:
raise Exception("invalid state %s" % state)
assert self.command_string, "No command string for\n%s" % pformat(lines)
def __str__(self):
return self.name_cmd
def alias_destroy(filename):
lines = []
defuns = {}
aliases = {}
with open(filename, 'r') as fh:
state = None
defun_lines = []
alias_lines = []
for (line_number, line) in enumerate(fh.readlines()):
if state is None:
if line.startswith('DEFUN ('):
assert line.count(',') == 1, "%d: Too many commas in\n%s" % (line_number, line)
defun_lines.append(line)
state = 'DEFUN_HEADER'
elif line.startswith('ALIAS ('):
assert line.count(',') == 1, "%d: Too many commas in\n%s" % (line_number, line)
alias_lines.append(line)
state = 'ALIAS_HEADER'
elif state == 'DEFUN_HEADER':
defun_lines.append(line)
if line.startswith('DEFUN'):
raise Exception("ERROR on line %d, found DEFUN inside DEFUN" % line_number)
elif line.startswith('ALIAS'):
raise Exception("ERROR on line %d, found ALIAS inside DEFUN" % line_number)
elif line.strip() == '{':
state = 'DEFUN_BODY'
elif state == 'ALIAS_HEADER':
alias_lines.append(line)
if line.startswith('ALIAS'):
raise Exception("ERROR on line %d, found ALIAS inside ALIAS" % line_number)
elif line.startswith('DEFUN'):
raise Exception("ERROR on line %d, found DEFUN inside ALIAS" % line_number)
if line.rstrip().endswith(')'):
new_alias = ALIAS(alias_lines)
aliases[new_alias.name_cmd] = new_alias
state = None
alias_lines = []
elif state == 'DEFUN_BODY':
defun_lines.append(line)
if line.rstrip() == '}':
new_defun = DEFUN(defun_lines)
defuns[new_defun.name] = new_defun
state = None
defun_lines = []
# uncomment to debug state machine
print "%5d %12s: %s" % (line_number, state, line.rstrip())
lines.append(line)
# At this point we know all of the aliases and all of the tokens
# Assign each ALIAS to its parent DEFUN
for alias in aliases.itervalues():
defun = defuns.get(alias.name)
assert defun, "Could not find DEFUN for %s" % alias
defun.aliases.append(alias)
# Now write the file but:
# - do not write any ALIASes
# - do not write the install_element for any ALIASes
# - when you write the DEFUN include a comment that contains the ALIAS command strings it needs to cover
with open(filename, 'w') as fh:
state = None
for line in lines:
if state is None:
if line.startswith('DEFUN ('):
state = 'DEFUN_HEADER'
re_name = re.search('DEFUN \((.*),', line.strip())
name = re_name.group(1)
defun = defuns.get(name)
fh.write(defun.dump())
elif line.startswith('ALIAS ('):
state = 'ALIAS_HEADER'
else:
if 'install_element' in line:
# install_element (CONFIG_NODE, &ip_community_list_name_standard_cmd);
re_install_element = re.search('install_element\s*\(\w+,\s*&(.*)\s*\)', line.strip())
if re_install_element:
cmd = re_install_element.group(1)
if cmd not in aliases:
fh.write(line)
else:
fh.write(line)
else:
fh.write(line)
elif state == 'DEFUN_HEADER':
if line.strip() == '{':
state = 'DEFUN_BODY'
elif state == 'ALIAS_HEADER':
if line.rstrip().endswith(')'):
state = None
elif state == 'DEFUN_BODY':
if line.rstrip() == '}':
state = None
if __name__ == '__main__':
filename = sys.argv[1]
if os.path.exists(filename):
alias_destroy(filename)
else:
print "ERROR: could not find file %s" % filename
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