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significantly speed up import time of ua_parser #171

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significantly speed up import time of ua_parser #171

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37 changes: 31 additions & 6 deletions ua_parser/user_agent_parser.py
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Original file line number Diff line number Diff line change
Expand Up @@ -24,6 +24,21 @@
__author__ = "Lindsey Simon <[email protected]>"


if sys.version_info >= (3, 8):
from functools import cached_property
else:
class cached_property:
def __init__(self, func):
self._func = func

def __get__(self, inst, owner):
if inst is None:
return self
else:
ret = inst.__dict__[self._func.__name__] = self._func(inst)
return ret


class UserAgentParser(object):
def __init__(
self, pattern, family_replacement=None, v1_replacement=None, v2_replacement=None
Expand All @@ -37,11 +52,14 @@ def __init__(
v2_replacement: a string to override the matched v2 (optional)
"""
self.pattern = pattern
self.user_agent_re = re.compile(self.pattern)
self.family_replacement = family_replacement
self.v1_replacement = v1_replacement
self.v2_replacement = v2_replacement

@cached_property
def user_agent_re(self):
return re.compile(self.pattern)

def MatchSpans(self, user_agent_string):
match_spans = []
match = self.user_agent_re.search(user_agent_string)
Expand Down Expand Up @@ -100,13 +118,16 @@ def __init__(
os_v4_replacement: a string to override the matched v4 (optional)
"""
self.pattern = pattern
self.user_agent_re = re.compile(self.pattern)
self.os_replacement = os_replacement
self.os_v1_replacement = os_v1_replacement
self.os_v2_replacement = os_v2_replacement
self.os_v3_replacement = os_v3_replacement
self.os_v4_replacement = os_v4_replacement

@cached_property
def user_agent_re(self):
return re.compile(self.pattern)

def MatchSpans(self, user_agent_string):
match_spans = []
match = self.user_agent_re.search(user_agent_string)
Expand Down Expand Up @@ -179,14 +200,18 @@ def __init__(
device_replacement: a string to override the matched device (optional)
"""
self.pattern = pattern
if regex_flag == "i":
self.user_agent_re = re.compile(self.pattern, re.IGNORECASE)
else:
self.user_agent_re = re.compile(self.pattern)
self.regex_flag = regex_flag
self.device_replacement = device_replacement
self.brand_replacement = brand_replacement
self.model_replacement = model_replacement

@cached_property
def user_agent_re(self):
if self.regex_flag == "i":
return re.compile(self.pattern, re.IGNORECASE)
else:
return re.compile(self.pattern)

def MatchSpans(self, user_agent_string):
match_spans = []
match = self.user_agent_re.search(user_agent_string)
Expand Down