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Defer compilation of regular expressions until first use.

This commit is contained in:
Martin v. Löwis 2004-03-25 14:58:19 +00:00
parent 85309512ec
commit 1c0f1f97fb
1 changed files with 7 additions and 3 deletions
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10
Lib/distutils/util.py
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@ -209,9 +209,12 @@ def grok_environment_error (exc, prefix="error: "):
# Needed by 'split_quoted()'
_wordchars_re = re.compile(r'[^\\\'\"%s ]*' % string.whitespace)
_squote_re = re.compile(r"'(?:[^'\\]|\\.)*'")
_dquote_re = re.compile(r'"(?:[^"\\]|\\.)*"')
_wordchars_re = _squote_re = _dquote_re = None
def _init_regex():
global _wordchars_re, _squote_re, _dquote_re
_wordchars_re = re.compile(r'[^\\\'\"%s ]*' % string.whitespace)
_squote_re = re.compile(r"'(?:[^'\\]|\\.)*'")
_dquote_re = re.compile(r'"(?:[^"\\]|\\.)*"')
def split_quoted (s):
"""Split a string up according to Unix shell-like rules for quotes and
@ -227,6 +230,7 @@ def split_quoted (s):
# This is a nice algorithm for splitting up a single string, since it
# doesn't require character-by-character examination. It was a little
# bit of a brain-bender to get it working right, though...
if _wordchars_re is None: _init_regex()
s = string.strip(s)
words = []