Revision 76
Added by Aaron Marcuse-Kubitza almost 13 years ago
| Parser.py | ||
|---|---|---|
| 5 | 5 |
class SyntaxException(Exception): pass |
| 6 | 6 |
|
| 7 | 7 |
class Parser: |
| 8 |
def __init__(self, string):
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|
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self._str = string
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|
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def __init__(self, str_):
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self._str = str_
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|
| 10 | 10 |
self._pos = 0 |
| 11 | 11 |
|
| 12 |
def parse(self): |
|
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tree = self._main() |
|
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def end(self): |
|
| 14 | 13 |
if not self._pos == len(self._str): self._syntax_err('End of string')
|
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return tree |
|
| 16 | 14 |
|
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def _match_re(self, pattern, required=False): |
|
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def str_(self, str_, required=False): |
|
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end_pos = self._pos + len(str_) |
|
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if self._str[self._pos:end_pos] == str_: |
|
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self._pos = end_pos |
|
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return True |
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elif required: self._syntax_err(str_) |
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else: return False |
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|
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def re(self, pattern, required=False): |
|
| 18 | 24 |
matcher = re.compile(pattern).match(self._str, self._pos) |
| 19 | 25 |
if matcher: |
| 20 | 26 |
self._pos = matcher.end(0) |
| ... | ... | |
| 22 | 28 |
elif required: self._syntax_err(pattern) |
| 23 | 29 |
else: return None |
| 24 | 30 |
|
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def _match_str(self, string, required=False): |
|
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end_pos = self._pos + len(string) |
|
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if self._str[self._pos:end_pos] == string: |
|
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self._pos = end_pos |
|
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return True |
|
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elif required: self._syntax_err(string) |
|
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else: return False |
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|
|
| 33 | 31 |
def _syntax_err(self, token): |
| 34 | 32 |
raise SyntaxException(self.__class__.__name__+' syntax error: '+token |
| 35 | 33 |
+' expected in '+self._str[self._pos:]) |
Also available in: Unified diff
Refactored xpath.parse() to use a nested function instead of a class extending Parser