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fix Python-2.3-compatibility problems
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,129 @@ | ||
| """A copy of the string Template class from python 2.4, included | ||
| for compatibility with python 2.3. | ||
| """ | ||
|
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| import re as _re | ||
|
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| class _multimap: | ||
| """Helper class for combining multiple mappings. | ||
| Used by .{safe_,}substitute() to combine the mapping and keyword | ||
| arguments. | ||
| """ | ||
| def __init__(self, primary, secondary): | ||
| self._primary = primary | ||
| self._secondary = secondary | ||
|
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| def __getitem__(self, key): | ||
| try: | ||
| return self._primary[key] | ||
| except KeyError: | ||
| return self._secondary[key] | ||
|
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| class _TemplateMetaclass(type): | ||
| pattern = r""" | ||
| %(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<invalid>) # Other ill-formed delimiter exprs | ||
| ) | ||
| """ | ||
|
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| def __init__(cls, name, bases, dct): | ||
| super(_TemplateMetaclass, cls).__init__(name, bases, dct) | ||
| if 'pattern' in dct: | ||
| pattern = cls.pattern | ||
| else: | ||
| pattern = _TemplateMetaclass.pattern % { | ||
| 'delim' : _re.escape(cls.delimiter), | ||
| 'id' : cls.idpattern, | ||
| } | ||
| cls.pattern = _re.compile(pattern, _re.IGNORECASE | _re.VERBOSE) | ||
|
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|
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| class Template: | ||
| """A string class for supporting $-substitutions.""" | ||
| __metaclass__ = _TemplateMetaclass | ||
|
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| delimiter = '$' | ||
| idpattern = r'[_a-z][_a-z0-9]*' | ||
|
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| def __init__(self, template): | ||
| self.template = template | ||
|
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| # Search for $$, $identifier, ${identifier}, and any bare $'s | ||
|
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| def _invalid(self, mo): | ||
| i = mo.start('invalid') | ||
| lines = self.template[:i].splitlines(True) | ||
| if not lines: | ||
| colno = 1 | ||
| lineno = 1 | ||
| else: | ||
| colno = i - len(''.join(lines[:-1])) | ||
| lineno = len(lines) | ||
| raise ValueError('Invalid placeholder in string: line %d, col %d' % | ||
| (lineno, colno)) | ||
|
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||
| def substitute(self, *args, **kws): | ||
| if len(args) > 1: | ||
| raise TypeError('Too many positional arguments') | ||
| if not args: | ||
| mapping = kws | ||
| elif kws: | ||
| mapping = _multimap(kws, args[0]) | ||
| else: | ||
| mapping = args[0] | ||
| # Helper function for .sub() | ||
| def convert(mo): | ||
| # Check the most common path first. | ||
| named = mo.group('named') or mo.group('braced') | ||
| if named is not None: | ||
| val = mapping[named] | ||
| # We use this idiom instead of str() because the latter will | ||
| # fail if val is a Unicode containing non-ASCII characters. | ||
| return '%s' % val | ||
| if mo.group('escaped') is not None: | ||
| return self.delimiter | ||
| if mo.group('invalid') is not None: | ||
| self._invalid(mo) | ||
| raise ValueError('Unrecognized named group in pattern', | ||
| self.pattern) | ||
| return self.pattern.sub(convert, self.template) | ||
|
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| def safe_substitute(self, *args, **kws): | ||
| if len(args) > 1: | ||
| raise TypeError('Too many positional arguments') | ||
| if not args: | ||
| mapping = kws | ||
| elif kws: | ||
| mapping = _multimap(kws, args[0]) | ||
| else: | ||
| mapping = args[0] | ||
| # Helper function for .sub() | ||
| def convert(mo): | ||
| named = mo.group('named') | ||
| if named is not None: | ||
| try: | ||
| # We use this idiom instead of str() because the latter | ||
| # will fail if val is a Unicode containing non-ASCII | ||
| return '%s' % mapping[named] | ||
| except KeyError: | ||
| return self.delimiter + named | ||
| braced = mo.group('braced') | ||
| if braced is not None: | ||
| try: | ||
| return '%s' % mapping[braced] | ||
| except KeyError: | ||
| return self.delimiter + '{' + braced + '}' | ||
| if mo.group('escaped') is not None: | ||
| return self.delimiter | ||
| if mo.group('invalid') is not None: | ||
| return self.delimiter | ||
| raise ValueError('Unrecognized named group in pattern', | ||
| self.pattern) | ||
| return self.pattern.sub(convert, self.template) | ||
|
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|
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