root / kamaki / cli / command_tree / __init__.py @ d252a7a8
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# Copyright 2012-2013 GRNET S.A. All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or
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# without modification, are permitted provided that the following
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# conditions are met:
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#
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# 1. Redistributions of source code must retain the above
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# copyright notice, this list of conditions and the following
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# disclaimer.
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#
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# 2. Redistributions in binary form must reproduce the above
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# copyright notice, this list of conditions and the following
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# disclaimer in the documentation and/or other materials
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# provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
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# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
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# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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#
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# The views and conclusions contained in the software and
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# documentation are those of the authors and should not be
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# interpreted as representing official policies, either expressed
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# or implied, of GRNET S.A.
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class Command(object): |
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"""Store a command and the next-level (2 levels)"""
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_name = None
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path = None
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cmd_class = None
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subcommands = {} |
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help = ' '
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def __init__(self, path, help=' ', subcommands={}, cmd_class=None): |
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assert path, 'Cannot initialize a command without a command path' |
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self.path = path
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self.help = help or '' |
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self.subcommands = dict(subcommands) if subcommands else {} |
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self.cmd_class = cmd_class or None |
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@property
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def name(self): |
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if not self._name: |
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self._name = self.path.split('_')[-1] |
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return str(self._name) |
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def add_subcmd(self, subcmd): |
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if subcmd.path == '%s_%s' % (self.path, subcmd.name): |
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self.subcommands[subcmd.name] = subcmd
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return True |
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return False |
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def get_subcmd(self, name): |
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try:
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return self.subcommands[name] |
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except KeyError: |
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return None |
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def contains(self, name): |
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"""Check if a name is a direct child of self"""
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return name in self.subcommands |
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@property
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def is_command(self): |
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return len(self.subcommands) == 0 if self.cmd_class else False |
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@property
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def parent_path(self): |
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try:
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return self.path[:self.path.rindex('_')] |
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except ValueError: |
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return '' |
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def parse_out(self, args): |
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"""Find the deepest subcommand matching a series of terms
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but stop the first time a term doesn't match
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:param args: (list) terms to match commands against
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:returns: (parsed out command, the rest of the arguments)
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:raises TypeError: if args is not inalterable
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"""
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cmd = self
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index = 0
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for term in args: |
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try:
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cmd = cmd.subcommands[term] |
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except KeyError: |
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break
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index += 1
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return cmd, args[index:]
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def pretty_print(self, recursive=False): |
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print('%s\t\t(Name: %s is_cmd: %s help: %s)' % (
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self.path, self.name, self.is_command, self.help)) |
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for cmd in self.subcommands.values(): |
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cmd.pretty_print(recursive) |
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class CommandTree(object): |
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def __init__(self, name, description=''): |
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self.name = name
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self.description = description
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self.groups = dict() |
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self._all_commands = dict() |
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def exclude(self, groups_to_exclude=[]): |
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for group in groups_to_exclude: |
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self.groups.pop(group, None) |
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def add_command(self, command_path, description=None, cmd_class=None): |
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terms = command_path.split('_')
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try:
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cmd = self.groups[terms[0]] |
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except KeyError: |
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cmd = Command(terms[0])
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self.groups[terms[0]] = cmd |
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self._all_commands[terms[0]] = cmd |
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path = terms[0]
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for term in terms[1:]: |
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path += '_' + term
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try:
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cmd = cmd.subcommands[term] |
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except KeyError: |
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new_cmd = Command(path) |
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self._all_commands[path] = new_cmd
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cmd.add_subcmd(new_cmd) |
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cmd = new_cmd |
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cmd.cmd_class = cmd_class or None |
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cmd.help = description or None |
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def find_best_match(self, terms): |
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"""Find a command that best matches a given list of terms
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:param terms: (list of str) match against paths in cmd_tree, e.g.
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['aa', 'bb', 'cc'] matches aa_bb_cc
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:returns: (Command, list) the matching command, the remaining terms or
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None
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"""
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path = [] |
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for term in terms: |
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check_path = path + [term] |
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if '_'.join(check_path) not in self._all_commands: |
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break
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path = check_path |
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if path:
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return (self._all_commands['_'.join(path)], terms[len(path):]) |
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return (None, terms) |
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def add_tree(self, new_tree): |
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tname = new_tree.name |
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tdesc = new_tree.description |
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self.groups.update(new_tree.groups)
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self._all_commands.update(new_tree._all_commands)
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try:
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self._all_commands[tname].help = tdesc
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except KeyError: |
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self.add_command(tname, tdesc)
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def has_command(self, path): |
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return path in self._all_commands |
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def get_command(self, path): |
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return self._all_commands[path] |
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def subnames(self, path=None): |
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if path in (None, ''): |
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return self.groups.keys() |
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return self._all_commands[path].subcommands.keys() |
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def get_subcommands(self, path=None): |
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return self._all_commands[path].subcommands.values() if ( |
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path) else self.groups.values() |
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def pretty_print(self, group=None): |
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if group is None: |
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for group in self.groups: |
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self.pretty_print(group)
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else:
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self.groups[group].pretty_print(recursive=True) |