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strdispatch.py

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strdispatch.py

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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 collections.abc 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 {}, {}>".format(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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