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"""String dispatch class to match regexps and dispatch commands.

"""

# Stdlib imports

import re

# Our own modules

from IPython.core.hooks import CommandChainDispatcher

# Code begins

class StrDispatch(object):

"""Dispatch (lookup) a set of strings / regexps for match.

Example:

>>> dis = StrDispatch()

>>> dis.add_s('hei',34, priority = 4)

>>> dis.add_s('hei',123, priority = 2)

>>> dis.add_re('h.i', 686)

>>> print list(dis.flat_matches('hei'))

[123, 34, 686]

"""

def __init__(self):

self.strs = {}

self.regexs = {}

def add_s(self, s, obj, priority= 0 ):

""" Adds a target 'string' for dispatching """

chain = self.strs.get(s, CommandChainDispatcher())

chain.add(obj,priority)

self.strs[s] = chain

def add_re(self, regex, obj, priority= 0 ):

""" Adds a target regexp for dispatching """

chain = self.regexs.get(regex, CommandChainDispatcher())

chain.add(obj,priority)

self.regexs[regex] = chain

def dispatch(self, key):

""" Get a seq of Commandchain objects that match key """

if key in self.strs:

yield self.strs[key]

for r, obj in self.regexs.items():

if re.match(r, key):

yield obj

else:

#print "nomatch",key # dbg

pass

def __repr__(self):

return "<Strdispatch %s, %s>" % (self.strs, self.regexs)

def s_matches(self, key):

if key not in self.strs:

return

for el in self.strs[key]:

yield el[1]

def flat_matches(self, key):

""" Yield all 'value' targets, without priority """

for val in self.dispatch(key):

for el in val:

yield el[1] # only value, no priority

return