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"""String dispatch class to match regexps and dispatch commands.
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"""
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# Stdlib imports
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import re
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# Our own modules
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from IPython.core.hooks import CommandChainDispatcher
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# Code begins
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class StrDispatch(object):
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"""Dispatch (lookup) a set of strings / regexps for match.
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Example:
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>>> dis = StrDispatch()
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>>> dis.add_s('hei',34, priority = 4)
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>>> dis.add_s('hei',123, priority = 2)
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>>> dis.add_re('h.i', 686)
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>>> print list(dis.flat_matches('hei'))
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[123, 34, 686]
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"""
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def __init__(self):
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self.strs = {}
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self.regexs = {}
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def add_s(self, s, obj, priority= 0 ):
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""" Adds a target 'string' for dispatching """
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chain = self.strs.get(s, CommandChainDispatcher())
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chain.add(obj,priority)
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self.strs[s] = chain
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def add_re(self, regex, obj, priority= 0 ):
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""" Adds a target regexp for dispatching """
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chain = self.regexs.get(regex, CommandChainDispatcher())
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chain.add(obj,priority)
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self.regexs[regex] = chain
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def dispatch(self, key):
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""" Get a seq of Commandchain objects that match key """
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if key in self.strs:
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yield self.strs[key]
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for r, obj in self.regexs.items():
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if re.match(r, key):
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yield obj
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else:
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#print "nomatch",key # dbg
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pass
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def __repr__(self):
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return "<Strdispatch %s, %s>" % (self.strs, self.regexs)
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def s_matches(self, key):
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if key not in self.strs:
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return
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for el in self.strs[key]:
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yield el[1]
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def flat_matches(self, key):
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""" Yield all 'value' targets, without priority """
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for val in self.dispatch(key):
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for el in val:
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yield el[1] # only value, no priority
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return
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