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bpo-1198569: Allow string.Template braced pattern to be different (#3288)

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* bpo-1198569: Allow the braced pattern to be different

``string.Template`` subclasses can optionally define ``braceidpattern`` if
they want to specify different placeholder patterns inside and outside the
braces.  If None (the default) it falls back to ``idpattern``.
This commit is contained in:
Barry Warsaw 2017-09-04 16:32:10 -04:00 • committed by GitHub
parent f9f17346d7
commit ba4279683f
4 changed files with 45 additions and 4 deletions
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4
Lib/string.py
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@ -57,7 +57,7 @@ class _TemplateMetaclass(type):
%(delim)s(?:
(?P<escaped>%(delim)s) | # Escape sequence of two delimiters
(?P<named>%(id)s) | # delimiter and a Python identifier
{(?P<braced>%(id)s)} | # delimiter and a braced identifier
{(?P<braced>%(bid)s)} | # delimiter and a braced identifier
(?P<invalid>) # Other ill-formed delimiter exprs
)
"""
@ -70,6 +70,7 @@ class _TemplateMetaclass(type):
pattern = _TemplateMetaclass.pattern % {
'delim' : _re.escape(cls.delimiter),
'id' : cls.idpattern,
'bid' : cls.braceidpattern or cls.idpattern,
}
cls.pattern = _re.compile(pattern, cls.flags | _re.VERBOSE)
@ -79,6 +80,7 @@ class Template(metaclass=_TemplateMetaclass):
delimiter = '$'
idpattern = r'[_a-z][_a-z0-9]*'
braceidpattern = None
flags = _re.IGNORECASE
def __init__(self, template):