cmdparse.py 4.27 KB
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# Copyright (C) 2009  Internet Systems Consortium.
#
# Permission to use, copy, modify, and distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SYSTEMS CONSORTIUM
# DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
# INTERNET SYSTEMS CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT,
# INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
# FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
# NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
# WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

import re
from exception import *
try:
    from collections import OrderedDict
except ImportError:
    from mycollections import OrderedDict

param_name_str = "^\s*(?P<param_name>[\w]+)\s*=\s*"
param_value_str = "(?P<param_value>[\w\./-]+)"
param_value_with_quota_str = "[\"\'](?P<param_value>[\w\., /-]+)[\"\']"
next_params_str = "(?P<blank>\s*)(?P<comma>,?)(?P<next_params>.*)$"

PARAM_WITH_QUOTA_PATTERN = re.compile(param_name_str + 
                                      param_value_with_quota_str +
                                      next_params_str)
PARAM_PATTERN = re.compile(param_name_str + param_value_str + next_params_str)
                           
# Used for module and command name
NAME_PATTERN = re.compile("^\s*(?P<name>[\w]+)(?P<blank>\s*)(?P<others>.*)$")

class BindCmdParse:
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    """ This class will parse the command line usr input into three part
    module name, command, parameters
    the first two parts are strings and parameter is one hash, 
    parameters part is optional
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    Example: zone reload, zone_name=example.com 
    module == zone
    command == reload
    params == [zone_name = 'example.com']
    """
    
    def __init__(self, cmd):
        self.params = OrderedDict()
        self.module = ''
        self.command = ''
        self._parse_cmd(cmd)

    def _parse_cmd(self, text_str):    
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        '''Parse command line. '''
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        # Get module name
        groups = NAME_PATTERN.match(text_str)
        if not groups:
            raise CmdModuleNameFormatError
        
        self.module = groups.group('name')
        cmd_str = groups.group('others')
        if cmd_str:
            if not groups.group('blank'):
                raise CmdModuleNameFormatError
        else:            
            raise CmdMissCommandNameFormatError(self.module)
            
        # Get command name
        groups = NAME_PATTERN.match(cmd_str)
        if (not groups):
            raise CmdCommandNameFormatError(self.module)
        
        self.command = groups.group('name')
        param_str = groups.group('others')
        if param_str:
            if not groups.group('blank'):
                raise CmdCommandNameFormatError(self.module)

            self._parse_params(param_str)


    def _parse_params(self, param_text):
        """convert a=b,c=d into one hash """
        
        # Check parameter name "help"
        param = NAME_PATTERN.match(param_text)
        if param and param.group('name') == "help":
            self.params["help"] = "help"
            return

        while True:
            if not param_text.strip():
                break
                
            groups = PARAM_PATTERN.match(param_text) or \
                     PARAM_WITH_QUOTA_PATTERN.match(param_text)
            
            if not groups:
                # ok, fill in the params in the order entered
                params = re.findall("([^\" ]+|\".*\")", param_text)
                i = 0
                for p in params:
                    self.params[i] = p
                    i += 1
                break
            else:
                self.params[groups.group('param_name')] = groups.group('param_value')
                param_text = groups.group('next_params')
                if not param_text or (not param_text.strip()):
                    break

                if not groups.group('blank') and \
                   not groups.group('comma'):
                    raise CmdParamFormatError(self.module, self.command)