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# Copyright 2017-2020 Palantir Technologies, Inc.
# Copyright 2021- Python Language Server Contributors.
import functools
import re
_RE_FIRST_CAP = re.compile('(.)([A-Z][a-z]+)')
_RE_ALL_CAP = re.compile('([a-z0-9])([A-Z])')
class MethodDispatcher:
"""JSON RPC dispatcher that calls methods on itself.
Method names are computed by converting camel case to snake case, slashes with double underscores, and removing
dollar signs.
"""
def __getitem__(self, item):
method_name = f'm_{_method_to_string(item)}'
if hasattr(self, method_name):
method = getattr(self, method_name)
@functools.wraps(method)
def handler(params):
return method(**(params or {}))
return handler
raise KeyError()
def _method_to_string(method):
return _camel_to_underscore(method.replace("/", "__").replace("$", ""))
def _camel_to_underscore(string):
s1 = _RE_FIRST_CAP.sub(r'\1_\2', string)
return _RE_ALL_CAP.sub(r'\1_\2', s1).lower()
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