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760 lines
25 KiB
760 lines
25 KiB
# results.py
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from collections.abc import MutableMapping, Mapping, MutableSequence, Iterator
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import pprint
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from weakref import ref as wkref
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from typing import Tuple, Any
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str_type: Tuple[type, ...] = (str, bytes)
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_generator_type = type((_ for _ in ()))
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class _ParseResultsWithOffset:
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__slots__ = ["tup"]
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def __init__(self, p1, p2):
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self.tup = (p1, p2)
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def __getitem__(self, i):
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return self.tup[i]
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def __getstate__(self):
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return self.tup
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def __setstate__(self, *args):
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self.tup = args[0]
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class ParseResults:
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"""Structured parse results, to provide multiple means of access to
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the parsed data:
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- as a list (``len(results)``)
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- by list index (``results[0], results[1]``, etc.)
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- by attribute (``results.<results_name>`` - see :class:`ParserElement.set_results_name`)
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Example::
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integer = Word(nums)
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date_str = (integer.set_results_name("year") + '/'
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+ integer.set_results_name("month") + '/'
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+ integer.set_results_name("day"))
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# equivalent form:
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# date_str = (integer("year") + '/'
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# + integer("month") + '/'
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# + integer("day"))
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# parse_string returns a ParseResults object
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result = date_str.parse_string("1999/12/31")
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def test(s, fn=repr):
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print("{} -> {}".format(s, fn(eval(s))))
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test("list(result)")
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test("result[0]")
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test("result['month']")
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test("result.day")
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test("'month' in result")
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test("'minutes' in result")
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test("result.dump()", str)
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prints::
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list(result) -> ['1999', '/', '12', '/', '31']
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result[0] -> '1999'
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result['month'] -> '12'
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result.day -> '31'
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'month' in result -> True
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'minutes' in result -> False
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result.dump() -> ['1999', '/', '12', '/', '31']
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- day: 31
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- month: 12
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- year: 1999
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"""
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_null_values: Tuple[Any, ...] = (None, [], "", ())
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__slots__ = [
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"_name",
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"_parent",
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"_all_names",
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"_modal",
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"_toklist",
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"_tokdict",
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"__weakref__",
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]
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class List(list):
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"""
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Simple wrapper class to distinguish parsed list results that should be preserved
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as actual Python lists, instead of being converted to :class:`ParseResults`:
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LBRACK, RBRACK = map(pp.Suppress, "[]")
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element = pp.Forward()
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item = ppc.integer
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element_list = LBRACK + pp.delimited_list(element) + RBRACK
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# add parse actions to convert from ParseResults to actual Python collection types
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def as_python_list(t):
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return pp.ParseResults.List(t.as_list())
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element_list.add_parse_action(as_python_list)
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element <<= item | element_list
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element.run_tests('''
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100
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[2,3,4]
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[[2, 1],3,4]
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[(2, 1),3,4]
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(2,3,4)
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''', post_parse=lambda s, r: (r[0], type(r[0])))
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prints:
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100
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(100, <class 'int'>)
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[2,3,4]
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([2, 3, 4], <class 'list'>)
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[[2, 1],3,4]
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([[2, 1], 3, 4], <class 'list'>)
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(Used internally by :class:`Group` when `aslist=True`.)
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"""
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def __new__(cls, contained=None):
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if contained is None:
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contained = []
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if not isinstance(contained, list):
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raise TypeError(
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"{} may only be constructed with a list,"
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" not {}".format(cls.__name__, type(contained).__name__)
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)
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return list.__new__(cls)
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def __new__(cls, toklist=None, name=None, **kwargs):
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if isinstance(toklist, ParseResults):
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return toklist
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self = object.__new__(cls)
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self._name = None
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self._parent = None
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self._all_names = set()
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if toklist is None:
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self._toklist = []
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elif isinstance(toklist, (list, _generator_type)):
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self._toklist = (
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[toklist[:]]
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if isinstance(toklist, ParseResults.List)
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else list(toklist)
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)
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else:
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self._toklist = [toklist]
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self._tokdict = dict()
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return self
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# Performance tuning: we construct a *lot* of these, so keep this
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# constructor as small and fast as possible
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def __init__(
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self, toklist=None, name=None, asList=True, modal=True, isinstance=isinstance
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):
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self._modal = modal
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if name is not None and name != "":
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if isinstance(name, int):
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name = str(name)
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if not modal:
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self._all_names = {name}
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self._name = name
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if toklist not in self._null_values:
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if isinstance(toklist, (str_type, type)):
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toklist = [toklist]
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if asList:
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if isinstance(toklist, ParseResults):
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self[name] = _ParseResultsWithOffset(
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ParseResults(toklist._toklist), 0
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)
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else:
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self[name] = _ParseResultsWithOffset(
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ParseResults(toklist[0]), 0
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)
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self[name]._name = name
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else:
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try:
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self[name] = toklist[0]
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except (KeyError, TypeError, IndexError):
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if toklist is not self:
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self[name] = toklist
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else:
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self._name = name
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def __getitem__(self, i):
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if isinstance(i, (int, slice)):
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return self._toklist[i]
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else:
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if i not in self._all_names:
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return self._tokdict[i][-1][0]
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else:
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return ParseResults([v[0] for v in self._tokdict[i]])
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def __setitem__(self, k, v, isinstance=isinstance):
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if isinstance(v, _ParseResultsWithOffset):
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self._tokdict[k] = self._tokdict.get(k, list()) + [v]
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sub = v[0]
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elif isinstance(k, (int, slice)):
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self._toklist[k] = v
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sub = v
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else:
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self._tokdict[k] = self._tokdict.get(k, list()) + [
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_ParseResultsWithOffset(v, 0)
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]
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sub = v
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if isinstance(sub, ParseResults):
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sub._parent = wkref(self)
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def __delitem__(self, i):
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if isinstance(i, (int, slice)):
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mylen = len(self._toklist)
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del self._toklist[i]
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# convert int to slice
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if isinstance(i, int):
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if i < 0:
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i += mylen
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i = slice(i, i + 1)
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# get removed indices
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removed = list(range(*i.indices(mylen)))
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removed.reverse()
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# fixup indices in token dictionary
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for name, occurrences in self._tokdict.items():
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for j in removed:
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for k, (value, position) in enumerate(occurrences):
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occurrences[k] = _ParseResultsWithOffset(
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value, position - (position > j)
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)
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else:
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del self._tokdict[i]
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def __contains__(self, k) -> bool:
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return k in self._tokdict
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def __len__(self) -> int:
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return len(self._toklist)
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def __bool__(self) -> bool:
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return not not (self._toklist or self._tokdict)
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def __iter__(self) -> Iterator:
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return iter(self._toklist)
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def __reversed__(self) -> Iterator:
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return iter(self._toklist[::-1])
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def keys(self):
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return iter(self._tokdict)
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def values(self):
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return (self[k] for k in self.keys())
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def items(self):
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return ((k, self[k]) for k in self.keys())
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def haskeys(self) -> bool:
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"""
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Since ``keys()`` returns an iterator, this method is helpful in bypassing
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code that looks for the existence of any defined results names."""
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return bool(self._tokdict)
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def pop(self, *args, **kwargs):
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"""
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Removes and returns item at specified index (default= ``last``).
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Supports both ``list`` and ``dict`` semantics for ``pop()``. If
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passed no argument or an integer argument, it will use ``list``
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semantics and pop tokens from the list of parsed tokens. If passed
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a non-integer argument (most likely a string), it will use ``dict``
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semantics and pop the corresponding value from any defined results
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names. A second default return value argument is supported, just as in
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``dict.pop()``.
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Example::
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numlist = Word(nums)[...]
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print(numlist.parse_string("0 123 321")) # -> ['0', '123', '321']
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def remove_first(tokens):
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tokens.pop(0)
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numlist.add_parse_action(remove_first)
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print(numlist.parse_string("0 123 321")) # -> ['123', '321']
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label = Word(alphas)
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patt = label("LABEL") + OneOrMore(Word(nums))
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print(patt.parse_string("AAB 123 321").dump())
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# Use pop() in a parse action to remove named result (note that corresponding value is not
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# removed from list form of results)
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def remove_LABEL(tokens):
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tokens.pop("LABEL")
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return tokens
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patt.add_parse_action(remove_LABEL)
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print(patt.parse_string("AAB 123 321").dump())
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prints::
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['AAB', '123', '321']
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- LABEL: AAB
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['AAB', '123', '321']
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"""
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if not args:
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args = [-1]
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for k, v in kwargs.items():
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if k == "default":
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args = (args[0], v)
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else:
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raise TypeError(
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"pop() got an unexpected keyword argument {!r}".format(k)
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)
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if isinstance(args[0], int) or len(args) == 1 or args[0] in self:
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index = args[0]
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ret = self[index]
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del self[index]
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return ret
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else:
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defaultvalue = args[1]
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return defaultvalue
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def get(self, key, default_value=None):
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"""
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Returns named result matching the given key, or if there is no
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such name, then returns the given ``default_value`` or ``None`` if no
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``default_value`` is specified.
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Similar to ``dict.get()``.
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Example::
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integer = Word(nums)
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date_str = integer("year") + '/' + integer("month") + '/' + integer("day")
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result = date_str.parse_string("1999/12/31")
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print(result.get("year")) # -> '1999'
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print(result.get("hour", "not specified")) # -> 'not specified'
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print(result.get("hour")) # -> None
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"""
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if key in self:
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return self[key]
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else:
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return default_value
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def insert(self, index, ins_string):
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"""
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Inserts new element at location index in the list of parsed tokens.
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Similar to ``list.insert()``.
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Example::
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numlist = Word(nums)[...]
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print(numlist.parse_string("0 123 321")) # -> ['0', '123', '321']
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# use a parse action to insert the parse location in the front of the parsed results
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def insert_locn(locn, tokens):
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tokens.insert(0, locn)
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numlist.add_parse_action(insert_locn)
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print(numlist.parse_string("0 123 321")) # -> [0, '0', '123', '321']
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"""
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self._toklist.insert(index, ins_string)
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# fixup indices in token dictionary
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for name, occurrences in self._tokdict.items():
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for k, (value, position) in enumerate(occurrences):
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occurrences[k] = _ParseResultsWithOffset(
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value, position + (position > index)
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)
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def append(self, item):
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"""
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Add single element to end of ``ParseResults`` list of elements.
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Example::
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numlist = Word(nums)[...]
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print(numlist.parse_string("0 123 321")) # -> ['0', '123', '321']
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# use a parse action to compute the sum of the parsed integers, and add it to the end
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def append_sum(tokens):
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tokens.append(sum(map(int, tokens)))
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numlist.add_parse_action(append_sum)
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print(numlist.parse_string("0 123 321")) # -> ['0', '123', '321', 444]
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"""
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self._toklist.append(item)
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def extend(self, itemseq):
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"""
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Add sequence of elements to end of ``ParseResults`` list of elements.
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Example::
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patt = OneOrMore(Word(alphas))
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# use a parse action to append the reverse of the matched strings, to make a palindrome
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def make_palindrome(tokens):
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tokens.extend(reversed([t[::-1] for t in tokens]))
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return ''.join(tokens)
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patt.add_parse_action(make_palindrome)
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print(patt.parse_string("lskdj sdlkjf lksd")) # -> 'lskdjsdlkjflksddsklfjkldsjdksl'
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"""
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if isinstance(itemseq, ParseResults):
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self.__iadd__(itemseq)
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else:
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self._toklist.extend(itemseq)
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def clear(self):
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"""
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Clear all elements and results names.
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"""
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del self._toklist[:]
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self._tokdict.clear()
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def __getattr__(self, name):
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try:
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return self[name]
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except KeyError:
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if name.startswith("__"):
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raise AttributeError(name)
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return ""
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def __add__(self, other) -> "ParseResults":
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ret = self.copy()
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ret += other
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return ret
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def __iadd__(self, other) -> "ParseResults":
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if other._tokdict:
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offset = len(self._toklist)
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addoffset = lambda a: offset if a < 0 else a + offset
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otheritems = other._tokdict.items()
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otherdictitems = [
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(k, _ParseResultsWithOffset(v[0], addoffset(v[1])))
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for k, vlist in otheritems
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for v in vlist
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]
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for k, v in otherdictitems:
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self[k] = v
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if isinstance(v[0], ParseResults):
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v[0]._parent = wkref(self)
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self._toklist += other._toklist
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self._all_names |= other._all_names
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return self
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def __radd__(self, other) -> "ParseResults":
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if isinstance(other, int) and other == 0:
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# useful for merging many ParseResults using sum() builtin
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return self.copy()
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else:
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# this may raise a TypeError - so be it
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return other + self
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def __repr__(self) -> str:
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return "{}({!r}, {})".format(type(self).__name__, self._toklist, self.as_dict())
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def __str__(self) -> str:
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return (
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"["
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+ ", ".join(
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[
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str(i) if isinstance(i, ParseResults) else repr(i)
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for i in self._toklist
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]
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)
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+ "]"
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)
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def _asStringList(self, sep=""):
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out = []
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for item in self._toklist:
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if out and sep:
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out.append(sep)
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if isinstance(item, ParseResults):
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out += item._asStringList()
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else:
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out.append(str(item))
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return out
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def as_list(self) -> list:
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"""
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Returns the parse results as a nested list of matching tokens, all converted to strings.
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Example::
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patt = OneOrMore(Word(alphas))
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result = patt.parse_string("sldkj lsdkj sldkj")
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# even though the result prints in string-like form, it is actually a pyparsing ParseResults
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print(type(result), result) # -> <class 'pyparsing.ParseResults'> ['sldkj', 'lsdkj', 'sldkj']
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# Use as_list() to create an actual list
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result_list = result.as_list()
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print(type(result_list), result_list) # -> <class 'list'> ['sldkj', 'lsdkj', 'sldkj']
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"""
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return [
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res.as_list() if isinstance(res, ParseResults) else res
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for res in self._toklist
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]
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def as_dict(self) -> dict:
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"""
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Returns the named parse results as a nested dictionary.
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Example::
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integer = Word(nums)
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date_str = integer("year") + '/' + integer("month") + '/' + integer("day")
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result = date_str.parse_string('12/31/1999')
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print(type(result), repr(result)) # -> <class 'pyparsing.ParseResults'> (['12', '/', '31', '/', '1999'], {'day': [('1999', 4)], 'year': [('12', 0)], 'month': [('31', 2)]})
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result_dict = result.as_dict()
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print(type(result_dict), repr(result_dict)) # -> <class 'dict'> {'day': '1999', 'year': '12', 'month': '31'}
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# even though a ParseResults supports dict-like access, sometime you just need to have a dict
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import json
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print(json.dumps(result)) # -> Exception: TypeError: ... is not JSON serializable
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print(json.dumps(result.as_dict())) # -> {"month": "31", "day": "1999", "year": "12"}
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"""
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def to_item(obj):
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if isinstance(obj, ParseResults):
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return obj.as_dict() if obj.haskeys() else [to_item(v) for v in obj]
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else:
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return obj
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return dict((k, to_item(v)) for k, v in self.items())
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def copy(self) -> "ParseResults":
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"""
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Returns a new copy of a :class:`ParseResults` object.
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"""
|
|
ret = ParseResults(self._toklist)
|
|
ret._tokdict = self._tokdict.copy()
|
|
ret._parent = self._parent
|
|
ret._all_names |= self._all_names
|
|
ret._name = self._name
|
|
return ret
|
|
|
|
def get_name(self):
|
|
r"""
|
|
Returns the results name for this token expression. Useful when several
|
|
different expressions might match at a particular location.
|
|
|
|
Example::
|
|
|
|
integer = Word(nums)
|
|
ssn_expr = Regex(r"\d\d\d-\d\d-\d\d\d\d")
|
|
house_number_expr = Suppress('#') + Word(nums, alphanums)
|
|
user_data = (Group(house_number_expr)("house_number")
|
|
| Group(ssn_expr)("ssn")
|
|
| Group(integer)("age"))
|
|
user_info = OneOrMore(user_data)
|
|
|
|
result = user_info.parse_string("22 111-22-3333 #221B")
|
|
for item in result:
|
|
print(item.get_name(), ':', item[0])
|
|
|
|
prints::
|
|
|
|
age : 22
|
|
ssn : 111-22-3333
|
|
house_number : 221B
|
|
"""
|
|
if self._name:
|
|
return self._name
|
|
elif self._parent:
|
|
par = self._parent()
|
|
|
|
def find_in_parent(sub):
|
|
return next(
|
|
(
|
|
k
|
|
for k, vlist in par._tokdict.items()
|
|
for v, loc in vlist
|
|
if sub is v
|
|
),
|
|
None,
|
|
)
|
|
|
|
return find_in_parent(self) if par else None
|
|
elif (
|
|
len(self) == 1
|
|
and len(self._tokdict) == 1
|
|
and next(iter(self._tokdict.values()))[0][1] in (0, -1)
|
|
):
|
|
return next(iter(self._tokdict.keys()))
|
|
else:
|
|
return None
|
|
|
|
def dump(self, indent="", full=True, include_list=True, _depth=0) -> str:
|
|
"""
|
|
Diagnostic method for listing out the contents of
|
|
a :class:`ParseResults`. Accepts an optional ``indent`` argument so
|
|
that this string can be embedded in a nested display of other data.
|
|
|
|
Example::
|
|
|
|
integer = Word(nums)
|
|
date_str = integer("year") + '/' + integer("month") + '/' + integer("day")
|
|
|
|
result = date_str.parse_string('12/31/1999')
|
|
print(result.dump())
|
|
|
|
prints::
|
|
|
|
['12', '/', '31', '/', '1999']
|
|
- day: 1999
|
|
- month: 31
|
|
- year: 12
|
|
"""
|
|
out = []
|
|
NL = "\n"
|
|
out.append(indent + str(self.as_list()) if include_list else "")
|
|
|
|
if full:
|
|
if self.haskeys():
|
|
items = sorted((str(k), v) for k, v in self.items())
|
|
for k, v in items:
|
|
if out:
|
|
out.append(NL)
|
|
out.append("{}{}- {}: ".format(indent, (" " * _depth), k))
|
|
if isinstance(v, ParseResults):
|
|
if v:
|
|
out.append(
|
|
v.dump(
|
|
indent=indent,
|
|
full=full,
|
|
include_list=include_list,
|
|
_depth=_depth + 1,
|
|
)
|
|
)
|
|
else:
|
|
out.append(str(v))
|
|
else:
|
|
out.append(repr(v))
|
|
if any(isinstance(vv, ParseResults) for vv in self):
|
|
v = self
|
|
for i, vv in enumerate(v):
|
|
if isinstance(vv, ParseResults):
|
|
out.append(
|
|
"\n{}{}[{}]:\n{}{}{}".format(
|
|
indent,
|
|
(" " * (_depth)),
|
|
i,
|
|
indent,
|
|
(" " * (_depth + 1)),
|
|
vv.dump(
|
|
indent=indent,
|
|
full=full,
|
|
include_list=include_list,
|
|
_depth=_depth + 1,
|
|
),
|
|
)
|
|
)
|
|
else:
|
|
out.append(
|
|
"\n%s%s[%d]:\n%s%s%s"
|
|
% (
|
|
indent,
|
|
(" " * (_depth)),
|
|
i,
|
|
indent,
|
|
(" " * (_depth + 1)),
|
|
str(vv),
|
|
)
|
|
)
|
|
|
|
return "".join(out)
|
|
|
|
def pprint(self, *args, **kwargs):
|
|
"""
|
|
Pretty-printer for parsed results as a list, using the
|
|
`pprint <https://docs.python.org/3/library/pprint.html>`_ module.
|
|
Accepts additional positional or keyword args as defined for
|
|
`pprint.pprint <https://docs.python.org/3/library/pprint.html#pprint.pprint>`_ .
|
|
|
|
Example::
|
|
|
|
ident = Word(alphas, alphanums)
|
|
num = Word(nums)
|
|
func = Forward()
|
|
term = ident | num | Group('(' + func + ')')
|
|
func <<= ident + Group(Optional(delimited_list(term)))
|
|
result = func.parse_string("fna a,b,(fnb c,d,200),100")
|
|
result.pprint(width=40)
|
|
|
|
prints::
|
|
|
|
['fna',
|
|
['a',
|
|
'b',
|
|
['(', 'fnb', ['c', 'd', '200'], ')'],
|
|
'100']]
|
|
"""
|
|
pprint.pprint(self.as_list(), *args, **kwargs)
|
|
|
|
# add support for pickle protocol
|
|
def __getstate__(self):
|
|
return (
|
|
self._toklist,
|
|
(
|
|
self._tokdict.copy(),
|
|
self._parent is not None and self._parent() or None,
|
|
self._all_names,
|
|
self._name,
|
|
),
|
|
)
|
|
|
|
def __setstate__(self, state):
|
|
self._toklist, (self._tokdict, par, inAccumNames, self._name) = state
|
|
self._all_names = set(inAccumNames)
|
|
if par is not None:
|
|
self._parent = wkref(par)
|
|
else:
|
|
self._parent = None
|
|
|
|
def __getnewargs__(self):
|
|
return self._toklist, self._name
|
|
|
|
def __dir__(self):
|
|
return dir(type(self)) + list(self.keys())
|
|
|
|
@classmethod
|
|
def from_dict(cls, other, name=None) -> "ParseResults":
|
|
"""
|
|
Helper classmethod to construct a ``ParseResults`` from a ``dict``, preserving the
|
|
name-value relations as results names. If an optional ``name`` argument is
|
|
given, a nested ``ParseResults`` will be returned.
|
|
"""
|
|
|
|
def is_iterable(obj):
|
|
try:
|
|
iter(obj)
|
|
except Exception:
|
|
return False
|
|
else:
|
|
return not isinstance(obj, str_type)
|
|
|
|
ret = cls([])
|
|
for k, v in other.items():
|
|
if isinstance(v, Mapping):
|
|
ret += cls.from_dict(v, name=k)
|
|
else:
|
|
ret += cls([v], name=k, asList=is_iterable(v))
|
|
if name is not None:
|
|
ret = cls([ret], name=name)
|
|
return ret
|
|
|
|
asList = as_list
|
|
asDict = as_dict
|
|
getName = get_name
|
|
|
|
|
|
MutableMapping.register(ParseResults)
|
|
MutableSequence.register(ParseResults)
|
|
|