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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
- from typing import Callable
- # Code begins
- class StrDispatch:
- """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: str, obj: Callable, priority: int= 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
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