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1101 lines
38 KiB
Python
1101 lines
38 KiB
Python
![]()
2 months ago
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# helpers.py
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import html.entities
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import re
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import sys
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import typing
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from . import __diag__
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from .core import *
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from .util import (
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_bslash,
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_flatten,
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_escape_regex_range_chars,
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replaced_by_pep8,
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)
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#
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# global helpers
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#
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def counted_array(
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expr: ParserElement,
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int_expr: typing.Optional[ParserElement] = None,
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*,
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intExpr: typing.Optional[ParserElement] = None,
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) -> ParserElement:
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"""Helper to define a counted list of expressions.
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This helper defines a pattern of the form::
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integer expr expr expr...
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where the leading integer tells how many expr expressions follow.
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The matched tokens returns the array of expr tokens as a list - the
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leading count token is suppressed.
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If ``int_expr`` is specified, it should be a pyparsing expression
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that produces an integer value.
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Example::
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counted_array(Word(alphas)).parse_string('2 ab cd ef') # -> ['ab', 'cd']
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# in this parser, the leading integer value is given in binary,
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# '10' indicating that 2 values are in the array
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binary_constant = Word('01').set_parse_action(lambda t: int(t[0], 2))
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counted_array(Word(alphas), int_expr=binary_constant).parse_string('10 ab cd ef') # -> ['ab', 'cd']
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# if other fields must be parsed after the count but before the
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# list items, give the fields results names and they will
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# be preserved in the returned ParseResults:
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count_with_metadata = integer + Word(alphas)("type")
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typed_array = counted_array(Word(alphanums), int_expr=count_with_metadata)("items")
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result = typed_array.parse_string("3 bool True True False")
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print(result.dump())
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# prints
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# ['True', 'True', 'False']
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# - items: ['True', 'True', 'False']
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# - type: 'bool'
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"""
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intExpr = intExpr or int_expr
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array_expr = Forward()
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def count_field_parse_action(s, l, t):
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nonlocal array_expr
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n = t[0]
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array_expr <<= (expr * n) if n else Empty()
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# clear list contents, but keep any named results
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del t[:]
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if intExpr is None:
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intExpr = Word(nums).set_parse_action(lambda t: int(t[0]))
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else:
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intExpr = intExpr.copy()
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intExpr.set_name("arrayLen")
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intExpr.add_parse_action(count_field_parse_action, call_during_try=True)
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return (intExpr + array_expr).set_name("(len) " + str(expr) + "...")
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def match_previous_literal(expr: ParserElement) -> ParserElement:
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"""Helper to define an expression that is indirectly defined from
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the tokens matched in a previous expression, that is, it looks for
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a 'repeat' of a previous expression. For example::
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first = Word(nums)
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second = match_previous_literal(first)
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match_expr = first + ":" + second
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will match ``"1:1"``, but not ``"1:2"``. Because this
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matches a previous literal, will also match the leading
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``"1:1"`` in ``"1:10"``. If this is not desired, use
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:class:`match_previous_expr`. Do *not* use with packrat parsing
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enabled.
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"""
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rep = Forward()
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def copy_token_to_repeater(s, l, t):
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if t:
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if len(t) == 1:
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rep << t[0]
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else:
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# flatten t tokens
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tflat = _flatten(t.as_list())
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rep << And(Literal(tt) for tt in tflat)
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else:
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rep << Empty()
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expr.add_parse_action(copy_token_to_repeater, callDuringTry=True)
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rep.set_name("(prev) " + str(expr))
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return rep
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def match_previous_expr(expr: ParserElement) -> ParserElement:
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"""Helper to define an expression that is indirectly defined from
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the tokens matched in a previous expression, that is, it looks for
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a 'repeat' of a previous expression. For example::
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first = Word(nums)
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second = match_previous_expr(first)
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match_expr = first + ":" + second
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will match ``"1:1"``, but not ``"1:2"``. Because this
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matches by expressions, will *not* match the leading ``"1:1"``
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in ``"1:10"``; the expressions are evaluated first, and then
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compared, so ``"1"`` is compared with ``"10"``. Do *not* use
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with packrat parsing enabled.
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"""
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rep = Forward()
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e2 = expr.copy()
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rep <<= e2
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def copy_token_to_repeater(s, l, t):
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matchTokens = _flatten(t.as_list())
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def must_match_these_tokens(s, l, t):
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theseTokens = _flatten(t.as_list())
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if theseTokens != matchTokens:
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raise ParseException(
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s, l, f"Expected {matchTokens}, found{theseTokens}"
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)
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rep.set_parse_action(must_match_these_tokens, callDuringTry=True)
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expr.add_parse_action(copy_token_to_repeater, callDuringTry=True)
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rep.set_name("(prev) " + str(expr))
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return rep
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def one_of(
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strs: Union[typing.Iterable[str], str],
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caseless: bool = False,
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use_regex: bool = True,
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as_keyword: bool = False,
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*,
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useRegex: bool = True,
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asKeyword: bool = False,
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) -> ParserElement:
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"""Helper to quickly define a set of alternative :class:`Literal` s,
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and makes sure to do longest-first testing when there is a conflict,
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regardless of the input order, but returns
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a :class:`MatchFirst` for best performance.
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Parameters:
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- ``strs`` - a string of space-delimited literals, or a collection of
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string literals
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- ``caseless`` - treat all literals as caseless - (default= ``False``)
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- ``use_regex`` - as an optimization, will
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generate a :class:`Regex` object; otherwise, will generate
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a :class:`MatchFirst` object (if ``caseless=True`` or ``as_keyword=True``, or if
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creating a :class:`Regex` raises an exception) - (default= ``True``)
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- ``as_keyword`` - enforce :class:`Keyword`-style matching on the
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generated expressions - (default= ``False``)
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- ``asKeyword`` and ``useRegex`` are retained for pre-PEP8 compatibility,
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but will be removed in a future release
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Example::
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comp_oper = one_of("< = > <= >= !=")
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var = Word(alphas)
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number = Word(nums)
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term = var | number
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comparison_expr = term + comp_oper + term
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print(comparison_expr.search_string("B = 12 AA=23 B<=AA AA>12"))
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prints::
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[['B', '=', '12'], ['AA', '=', '23'], ['B', '<=', 'AA'], ['AA', '>', '12']]
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"""
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asKeyword = asKeyword or as_keyword
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useRegex = useRegex and use_regex
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if (
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isinstance(caseless, str_type)
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and __diag__.warn_on_multiple_string_args_to_oneof
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):
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warnings.warn(
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"More than one string argument passed to one_of, pass"
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" choices as a list or space-delimited string",
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stacklevel=2,
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)
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if caseless:
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isequal = lambda a, b: a.upper() == b.upper()
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masks = lambda a, b: b.upper().startswith(a.upper())
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parseElementClass = CaselessKeyword if asKeyword else CaselessLiteral
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else:
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isequal = lambda a, b: a == b
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masks = lambda a, b: b.startswith(a)
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parseElementClass = Keyword if asKeyword else Literal
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symbols: List[str] = []
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if isinstance(strs, str_type):
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strs = typing.cast(str, strs)
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symbols = strs.split()
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elif isinstance(strs, Iterable):
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symbols = list(strs)
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else:
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raise TypeError("Invalid argument to one_of, expected string or iterable")
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if not symbols:
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return NoMatch()
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# reorder given symbols to take care to avoid masking longer choices with shorter ones
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# (but only if the given symbols are not just single characters)
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if any(len(sym) > 1 for sym in symbols):
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i = 0
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while i < len(symbols) - 1:
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cur = symbols[i]
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for j, other in enumerate(symbols[i + 1 :]):
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if isequal(other, cur):
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del symbols[i + j + 1]
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break
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elif masks(cur, other):
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del symbols[i + j + 1]
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symbols.insert(i, other)
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break
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else:
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i += 1
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if useRegex:
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re_flags: int = re.IGNORECASE if caseless else 0
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try:
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if all(len(sym) == 1 for sym in symbols):
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# symbols are just single characters, create range regex pattern
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patt = f"[{''.join(_escape_regex_range_chars(sym) for sym in symbols)}]"
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else:
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patt = "|".join(re.escape(sym) for sym in symbols)
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# wrap with \b word break markers if defining as keywords
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if asKeyword:
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patt = rf"\b(?:{patt})\b"
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ret = Regex(patt, flags=re_flags).set_name(" | ".join(symbols))
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if caseless:
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# add parse action to return symbols as specified, not in random
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# casing as found in input string
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symbol_map = {sym.lower(): sym for sym in symbols}
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ret.add_parse_action(lambda s, l, t: symbol_map[t[0].lower()])
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return ret
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except re.error:
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warnings.warn(
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"Exception creating Regex for one_of, building MatchFirst", stacklevel=2
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)
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# last resort, just use MatchFirst
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return MatchFirst(parseElementClass(sym) for sym in symbols).set_name(
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" | ".join(symbols)
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)
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def dict_of(key: ParserElement, value: ParserElement) -> ParserElement:
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"""Helper to easily and clearly define a dictionary by specifying
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the respective patterns for the key and value. Takes care of
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defining the :class:`Dict`, :class:`ZeroOrMore`, and
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:class:`Group` tokens in the proper order. The key pattern
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can include delimiting markers or punctuation, as long as they are
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suppressed, thereby leaving the significant key text. The value
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pattern can include named results, so that the :class:`Dict` results
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can include named token fields.
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Example::
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text = "shape: SQUARE posn: upper left color: light blue texture: burlap"
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attr_expr = (label + Suppress(':') + OneOrMore(data_word, stop_on=label).set_parse_action(' '.join))
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print(attr_expr[1, ...].parse_string(text).dump())
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attr_label = label
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attr_value = Suppress(':') + OneOrMore(data_word, stop_on=label).set_parse_action(' '.join)
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# similar to Dict, but simpler call format
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result = dict_of(attr_label, attr_value).parse_string(text)
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print(result.dump())
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print(result['shape'])
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print(result.shape) # object attribute access works too
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print(result.as_dict())
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prints::
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[['shape', 'SQUARE'], ['posn', 'upper left'], ['color', 'light blue'], ['texture', 'burlap']]
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- color: 'light blue'
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- posn: 'upper left'
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- shape: 'SQUARE'
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- texture: 'burlap'
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SQUARE
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SQUARE
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{'color': 'light blue', 'shape': 'SQUARE', 'posn': 'upper left', 'texture': 'burlap'}
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"""
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return Dict(OneOrMore(Group(key + value)))
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def original_text_for(
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expr: ParserElement, as_string: bool = True, *, asString: bool = True
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) -> ParserElement:
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"""Helper to return the original, untokenized text for a given
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expression. Useful to restore the parsed fields of an HTML start
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tag into the raw tag text itself, or to revert separate tokens with
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intervening whitespace back to the original matching input text. By
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default, returns a string containing the original parsed text.
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If the optional ``as_string`` argument is passed as
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``False``, then the return value is
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a :class:`ParseResults` containing any results names that
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were originally matched, and a single token containing the original
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matched text from the input string. So if the expression passed to
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:class:`original_text_for` contains expressions with defined
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results names, you must set ``as_string`` to ``False`` if you
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want to preserve those results name values.
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The ``asString`` pre-PEP8 argument is retained for compatibility,
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but will be removed in a future release.
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Example::
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src = "this is test <b> bold <i>text</i> </b> normal text "
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for tag in ("b", "i"):
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opener, closer = make_html_tags(tag)
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patt = original_text_for(opener + ... + closer)
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print(patt.search_string(src)[0])
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prints::
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['<b> bold <i>text</i> </b>']
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['<i>text</i>']
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"""
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asString = asString and as_string
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locMarker = Empty().set_parse_action(lambda s, loc, t: loc)
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endlocMarker = locMarker.copy()
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endlocMarker.callPreparse = False
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matchExpr = locMarker("_original_start") + expr + endlocMarker("_original_end")
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if asString:
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extractText = lambda s, l, t: s[t._original_start : t._original_end]
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else:
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def extractText(s, l, t):
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t[:] = [s[t.pop("_original_start") : t.pop("_original_end")]]
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matchExpr.set_parse_action(extractText)
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matchExpr.ignoreExprs = expr.ignoreExprs
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matchExpr.suppress_warning(Diagnostics.warn_ungrouped_named_tokens_in_collection)
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return matchExpr
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def ungroup(expr: ParserElement) -> ParserElement:
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"""Helper to undo pyparsing's default grouping of And expressions,
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even if all but one are non-empty.
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"""
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return TokenConverter(expr).add_parse_action(lambda t: t[0])
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def locatedExpr(expr: ParserElement) -> ParserElement:
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"""
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(DEPRECATED - future code should use the :class:`Located` class)
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Helper to decorate a returned token with its starting and ending
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locations in the input string.
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This helper adds the following results names:
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- ``locn_start`` - location where matched expression begins
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- ``locn_end`` - location where matched expression ends
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- ``value`` - the actual parsed results
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Be careful if the input text contains ``<TAB>`` characters, you
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may want to call :class:`ParserElement.parse_with_tabs`
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Example::
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wd = Word(alphas)
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for match in locatedExpr(wd).search_string("ljsdf123lksdjjf123lkkjj1222"):
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print(match)
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prints::
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[[0, 'ljsdf', 5]]
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[[8, 'lksdjjf', 15]]
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[[18, 'lkkjj', 23]]
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"""
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locator = Empty().set_parse_action(lambda ss, ll, tt: ll)
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return Group(
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locator("locn_start")
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+ expr("value")
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+ locator.copy().leaveWhitespace()("locn_end")
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)
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def nested_expr(
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opener: Union[str, ParserElement] = "(",
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closer: Union[str, ParserElement] = ")",
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content: typing.Optional[ParserElement] = None,
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ignore_expr: ParserElement = quoted_string(),
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*,
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ignoreExpr: ParserElement = quoted_string(),
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) -> ParserElement:
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"""Helper method for defining nested lists enclosed in opening and
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closing delimiters (``"("`` and ``")"`` are the default).
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|
||
|
Parameters:
|
||
|
|
||
|
- ``opener`` - opening character for a nested list
|
||
|
(default= ``"("``); can also be a pyparsing expression
|
||
|
- ``closer`` - closing character for a nested list
|
||
|
(default= ``")"``); can also be a pyparsing expression
|
||
|
- ``content`` - expression for items within the nested lists
|
||
|
(default= ``None``)
|
||
|
- ``ignore_expr`` - expression for ignoring opening and closing delimiters
|
||
|
(default= :class:`quoted_string`)
|
||
|
- ``ignoreExpr`` - this pre-PEP8 argument is retained for compatibility
|
||
|
but will be removed in a future release
|
||
|
|
||
|
If an expression is not provided for the content argument, the
|
||
|
nested expression will capture all whitespace-delimited content
|
||
|
between delimiters as a list of separate values.
|
||
|
|
||
|
Use the ``ignore_expr`` argument to define expressions that may
|
||
|
contain opening or closing characters that should not be treated as
|
||
|
opening or closing characters for nesting, such as quoted_string or
|
||
|
a comment expression. Specify multiple expressions using an
|
||
|
:class:`Or` or :class:`MatchFirst`. The default is
|
||
|
:class:`quoted_string`, but if no expressions are to be ignored, then
|
||
|
pass ``None`` for this argument.
|
||
|
|
||
|
Example::
|
||
|
|
||
|
data_type = one_of("void int short long char float double")
|
||
|
decl_data_type = Combine(data_type + Opt(Word('*')))
|
||
|
ident = Word(alphas+'_', alphanums+'_')
|
||
|
number = pyparsing_common.number
|
||
|
arg = Group(decl_data_type + ident)
|
||
|
LPAR, RPAR = map(Suppress, "()")
|
||
|
|
||
|
code_body = nested_expr('{', '}', ignore_expr=(quoted_string | c_style_comment))
|
||
|
|
||
|
c_function = (decl_data_type("type")
|
||
|
+ ident("name")
|
||
|
+ LPAR + Opt(DelimitedList(arg), [])("args") + RPAR
|
||
|
+ code_body("body"))
|
||
|
c_function.ignore(c_style_comment)
|
||
|
|
||
|
source_code = '''
|
||
|
int is_odd(int x) {
|
||
|
return (x%2);
|
||
|
}
|
||
|
|
||
|
int dec_to_hex(char hchar) {
|
||
|
if (hchar >= '0' && hchar <= '9') {
|
||
|
return (ord(hchar)-ord('0'));
|
||
|
} else {
|
||
|
return (10+ord(hchar)-ord('A'));
|
||
|
}
|
||
|
}
|
||
|
'''
|
||
|
for func in c_function.search_string(source_code):
|
||
|
print("%(name)s (%(type)s) args: %(args)s" % func)
|
||
|
|
||
|
|
||
|
prints::
|
||
|
|
||
|
is_odd (int) args: [['int', 'x']]
|
||
|
dec_to_hex (int) args: [['char', 'hchar']]
|
||
|
"""
|
||
|
if ignoreExpr != ignore_expr:
|
||
|
ignoreExpr = ignore_expr if ignoreExpr == quoted_string() else ignoreExpr
|
||
|
if opener == closer:
|
||
|
raise ValueError("opening and closing strings cannot be the same")
|
||
|
if content is None:
|
||
|
if isinstance(opener, str_type) and isinstance(closer, str_type):
|
||
|
opener = typing.cast(str, opener)
|
||
|
closer = typing.cast(str, closer)
|
||
|
if len(opener) == 1 and len(closer) == 1:
|
||
|
if ignoreExpr is not None:
|
||
|
content = Combine(
|
||
|
OneOrMore(
|
||
|
~ignoreExpr
|
||
|
+ CharsNotIn(
|
||
|
opener + closer + ParserElement.DEFAULT_WHITE_CHARS,
|
||
|
exact=1,
|
||
|
)
|
||
|
)
|
||
|
).set_parse_action(lambda t: t[0].strip())
|
||
|
else:
|
||
|
content = empty.copy() + CharsNotIn(
|
||
|
opener + closer + ParserElement.DEFAULT_WHITE_CHARS
|
||
|
).set_parse_action(lambda t: t[0].strip())
|
||
|
else:
|
||
|
if ignoreExpr is not None:
|
||
|
content = Combine(
|
||
|
OneOrMore(
|
||
|
~ignoreExpr
|
||
|
+ ~Literal(opener)
|
||
|
+ ~Literal(closer)
|
||
|
+ CharsNotIn(ParserElement.DEFAULT_WHITE_CHARS, exact=1)
|
||
|
)
|
||
|
).set_parse_action(lambda t: t[0].strip())
|
||
|
else:
|
||
|
content = Combine(
|
||
|
OneOrMore(
|
||
|
~Literal(opener)
|
||
|
+ ~Literal(closer)
|
||
|
+ CharsNotIn(ParserElement.DEFAULT_WHITE_CHARS, exact=1)
|
||
|
)
|
||
|
).set_parse_action(lambda t: t[0].strip())
|
||
|
else:
|
||
|
raise ValueError(
|
||
|
"opening and closing arguments must be strings if no content expression is given"
|
||
|
)
|
||
|
ret = Forward()
|
||
|
if ignoreExpr is not None:
|
||
|
ret <<= Group(
|
||
|
Suppress(opener) + ZeroOrMore(ignoreExpr | ret | content) + Suppress(closer)
|
||
|
)
|
||
|
else:
|
||
|
ret <<= Group(Suppress(opener) + ZeroOrMore(ret | content) + Suppress(closer))
|
||
|
ret.set_name("nested %s%s expression" % (opener, closer))
|
||
|
return ret
|
||
|
|
||
|
|
||
|
def _makeTags(tagStr, xml, suppress_LT=Suppress("<"), suppress_GT=Suppress(">")):
|
||
|
"""Internal helper to construct opening and closing tag expressions, given a tag name"""
|
||
|
if isinstance(tagStr, str_type):
|
||
|
resname = tagStr
|
||
|
tagStr = Keyword(tagStr, caseless=not xml)
|
||
|
else:
|
||
|
resname = tagStr.name
|
||
|
|
||
|
tagAttrName = Word(alphas, alphanums + "_-:")
|
||
|
if xml:
|
||
|
tagAttrValue = dbl_quoted_string.copy().set_parse_action(remove_quotes)
|
||
|
openTag = (
|
||
|
suppress_LT
|
||
|
+ tagStr("tag")
|
||
|
+ Dict(ZeroOrMore(Group(tagAttrName + Suppress("=") + tagAttrValue)))
|
||
|
+ Opt("/", default=[False])("empty").set_parse_action(
|
||
|
lambda s, l, t: t[0] == "/"
|
||
|
)
|
||
|
+ suppress_GT
|
||
|
)
|
||
|
else:
|
||
|
tagAttrValue = quoted_string.copy().set_parse_action(remove_quotes) | Word(
|
||
|
printables, exclude_chars=">"
|
||
|
)
|
||
|
openTag = (
|
||
|
suppress_LT
|
||
|
+ tagStr("tag")
|
||
|
+ Dict(
|
||
|
ZeroOrMore(
|
||
|
Group(
|
||
|
tagAttrName.set_parse_action(lambda t: t[0].lower())
|
||
|
+ Opt(Suppress("=") + tagAttrValue)
|
||
|
)
|
||
|
)
|
||
|
)
|
||
|
+ Opt("/", default=[False])("empty").set_parse_action(
|
||
|
lambda s, l, t: t[0] == "/"
|
||
|
)
|
||
|
+ suppress_GT
|
||
|
)
|
||
|
closeTag = Combine(Literal("</") + tagStr + ">", adjacent=False)
|
||
|
|
||
|
openTag.set_name("<%s>" % resname)
|
||
|
# add start<tagname> results name in parse action now that ungrouped names are not reported at two levels
|
||
|
openTag.add_parse_action(
|
||
|
lambda t: t.__setitem__(
|
||
|
"start" + "".join(resname.replace(":", " ").title().split()), t.copy()
|
||
|
)
|
||
|
)
|
||
|
closeTag = closeTag(
|
||
|
"end" + "".join(resname.replace(":", " ").title().split())
|
||
|
).set_name("</%s>" % resname)
|
||
|
openTag.tag = resname
|
||
|
closeTag.tag = resname
|
||
|
openTag.tag_body = SkipTo(closeTag())
|
||
|
return openTag, closeTag
|
||
|
|
||
|
|
||
|
def make_html_tags(
|
||
|
tag_str: Union[str, ParserElement]
|
||
|
) -> Tuple[ParserElement, ParserElement]:
|
||
|
"""Helper to construct opening and closing tag expressions for HTML,
|
||
|
given a tag name. Matches tags in either upper or lower case,
|
||
|
attributes with namespaces and with quoted or unquoted values.
|
||
|
|
||
|
Example::
|
||
|
|
||
|
text = '<td>More info at the <a href="https://github.com/pyparsing/pyparsing/wiki">pyparsing</a> wiki page</td>'
|
||
|
# make_html_tags returns pyparsing expressions for the opening and
|
||
|
# closing tags as a 2-tuple
|
||
|
a, a_end = make_html_tags("A")
|
||
|
link_expr = a + SkipTo(a_end)("link_text") + a_end
|
||
|
|
||
|
for link in link_expr.search_string(text):
|
||
|
# attributes in the <A> tag (like "href" shown here) are
|
||
|
# also accessible as named results
|
||
|
print(link.link_text, '->', link.href)
|
||
|
|
||
|
prints::
|
||
|
|
||
|
pyparsing -> https://github.com/pyparsing/pyparsing/wiki
|
||
|
"""
|
||
|
return _makeTags(tag_str, False)
|
||
|
|
||
|
|
||
|
def make_xml_tags(
|
||
|
tag_str: Union[str, ParserElement]
|
||
|
) -> Tuple[ParserElement, ParserElement]:
|
||
|
"""Helper to construct opening and closing tag expressions for XML,
|
||
|
given a tag name. Matches tags only in the given upper/lower case.
|
||
|
|
||
|
Example: similar to :class:`make_html_tags`
|
||
|
"""
|
||
|
return _makeTags(tag_str, True)
|
||
|
|
||
|
|
||
|
any_open_tag: ParserElement
|
||
|
any_close_tag: ParserElement
|
||
|
any_open_tag, any_close_tag = make_html_tags(
|
||
|
Word(alphas, alphanums + "_:").set_name("any tag")
|
||
|
)
|
||
|
|
||
|
_htmlEntityMap = {k.rstrip(";"): v for k, v in html.entities.html5.items()}
|
||
|
common_html_entity = Regex("&(?P<entity>" + "|".join(_htmlEntityMap) + ");").set_name(
|
||
|
"common HTML entity"
|
||
|
)
|
||
|
|
||
|
|
||
|
def replace_html_entity(s, l, t):
|
||
|
"""Helper parser action to replace common HTML entities with their special characters"""
|
||
|
return _htmlEntityMap.get(t.entity)
|
||
|
|
||
|
|
||
|
class OpAssoc(Enum):
|
||
|
"""Enumeration of operator associativity
|
||
|
- used in constructing InfixNotationOperatorSpec for :class:`infix_notation`"""
|
||
|
|
||
|
LEFT = 1
|
||
|
RIGHT = 2
|
||
|
|
||
|
|
||
|
InfixNotationOperatorArgType = Union[
|
||
|
ParserElement, str, Tuple[Union[ParserElement, str], Union[ParserElement, str]]
|
||
|
]
|
||
|
InfixNotationOperatorSpec = Union[
|
||
|
Tuple[
|
||
|
InfixNotationOperatorArgType,
|
||
|
int,
|
||
|
OpAssoc,
|
||
|
typing.Optional[ParseAction],
|
||
|
],
|
||
|
Tuple[
|
||
|
InfixNotationOperatorArgType,
|
||
|
int,
|
||
|
OpAssoc,
|
||
|
],
|
||
|
]
|
||
|
|
||
|
|
||
|
def infix_notation(
|
||
|
base_expr: ParserElement,
|
||
|
op_list: List[InfixNotationOperatorSpec],
|
||
|
lpar: Union[str, ParserElement] = Suppress("("),
|
||
|
rpar: Union[str, ParserElement] = Suppress(")"),
|
||
|
) -> ParserElement:
|
||
|
"""Helper method for constructing grammars of expressions made up of
|
||
|
operators working in a precedence hierarchy. Operators may be unary
|
||
|
or binary, left- or right-associative. Parse actions can also be
|
||
|
attached to operator expressions. The generated parser will also
|
||
|
recognize the use of parentheses to override operator precedences
|
||
|
(see example below).
|
||
|
|
||
|
Note: if you define a deep operator list, you may see performance
|
||
|
issues when using infix_notation. See
|
||
|
:class:`ParserElement.enable_packrat` for a mechanism to potentially
|
||
|
improve your parser performance.
|
||
|
|
||
|
Parameters:
|
||
|
|
||
|
- ``base_expr`` - expression representing the most basic operand to
|
||
|
be used in the expression
|
||
|
- ``op_list`` - list of tuples, one for each operator precedence level
|
||
|
in the expression grammar; each tuple is of the form ``(op_expr,
|
||
|
num_operands, right_left_assoc, (optional)parse_action)``, where:
|
||
|
|
||
|
- ``op_expr`` is the pyparsing expression for the operator; may also
|
||
|
be a string, which will be converted to a Literal; if ``num_operands``
|
||
|
is 3, ``op_expr`` is a tuple of two expressions, for the two
|
||
|
operators separating the 3 terms
|
||
|
- ``num_operands`` is the number of terms for this operator (must be 1,
|
||
|
2, or 3)
|
||
|
- ``right_left_assoc`` is the indicator whether the operator is right
|
||
|
or left associative, using the pyparsing-defined constants
|
||
|
``OpAssoc.RIGHT`` and ``OpAssoc.LEFT``.
|
||
|
- ``parse_action`` is the parse action to be associated with
|
||
|
expressions matching this operator expression (the parse action
|
||
|
tuple member may be omitted); if the parse action is passed
|
||
|
a tuple or list of functions, this is equivalent to calling
|
||
|
``set_parse_action(*fn)``
|
||
|
(:class:`ParserElement.set_parse_action`)
|
||
|
- ``lpar`` - expression for matching left-parentheses; if passed as a
|
||
|
str, then will be parsed as ``Suppress(lpar)``. If lpar is passed as
|
||
|
an expression (such as ``Literal('(')``), then it will be kept in
|
||
|
the parsed results, and grouped with them. (default= ``Suppress('(')``)
|
||
|
- ``rpar`` - expression for matching right-parentheses; if passed as a
|
||
|
str, then will be parsed as ``Suppress(rpar)``. If rpar is passed as
|
||
|
an expression (such as ``Literal(')')``), then it will be kept in
|
||
|
the parsed results, and grouped with them. (default= ``Suppress(')')``)
|
||
|
|
||
|
Example::
|
||
|
|
||
|
# simple example of four-function arithmetic with ints and
|
||
|
# variable names
|
||
|
integer = pyparsing_common.signed_integer
|
||
|
varname = pyparsing_common.identifier
|
||
|
|
||
|
arith_expr = infix_notation(integer | varname,
|
||
|
[
|
||
|
('-', 1, OpAssoc.RIGHT),
|
||
|
(one_of('* /'), 2, OpAssoc.LEFT),
|
||
|
(one_of('+ -'), 2, OpAssoc.LEFT),
|
||
|
])
|
||
|
|
||
|
arith_expr.run_tests('''
|
||
|
5+3*6
|
||
|
(5+3)*6
|
||
|
-2--11
|
||
|
''', full_dump=False)
|
||
|
|
||
|
prints::
|
||
|
|
||
|
5+3*6
|
||
|
[[5, '+', [3, '*', 6]]]
|
||
|
|
||
|
(5+3)*6
|
||
|
[[[5, '+', 3], '*', 6]]
|
||
|
|
||
|
(5+x)*y
|
||
|
[[[5, '+', 'x'], '*', 'y']]
|
||
|
|
||
|
-2--11
|
||
|
[[['-', 2], '-', ['-', 11]]]
|
||
|
"""
|
||
|
|
||
|
# captive version of FollowedBy that does not do parse actions or capture results names
|
||
|
class _FB(FollowedBy):
|
||
|
def parseImpl(self, instring, loc, doActions=True):
|
||
|
self.expr.try_parse(instring, loc)
|
||
|
return loc, []
|
||
|
|
||
|
_FB.__name__ = "FollowedBy>"
|
||
|
|
||
|
ret = Forward()
|
||
|
if isinstance(lpar, str):
|
||
|
lpar = Suppress(lpar)
|
||
|
if isinstance(rpar, str):
|
||
|
rpar = Suppress(rpar)
|
||
|
|
||
|
# if lpar and rpar are not suppressed, wrap in group
|
||
|
if not (isinstance(rpar, Suppress) and isinstance(rpar, Suppress)):
|
||
|
lastExpr = base_expr | Group(lpar + ret + rpar)
|
||
|
else:
|
||
|
lastExpr = base_expr | (lpar + ret + rpar)
|
||
|
|
||
|
arity: int
|
||
|
rightLeftAssoc: opAssoc
|
||
|
pa: typing.Optional[ParseAction]
|
||
|
opExpr1: ParserElement
|
||
|
opExpr2: ParserElement
|
||
|
for i, operDef in enumerate(op_list):
|
||
|
opExpr, arity, rightLeftAssoc, pa = (operDef + (None,))[:4] # type: ignore[assignment]
|
||
|
if isinstance(opExpr, str_type):
|
||
|
opExpr = ParserElement._literalStringClass(opExpr)
|
||
|
opExpr = typing.cast(ParserElement, opExpr)
|
||
|
if arity == 3:
|
||
|
if not isinstance(opExpr, (tuple, list)) or len(opExpr) != 2:
|
||
|
raise ValueError(
|
||
|
"if numterms=3, opExpr must be a tuple or list of two expressions"
|
||
|
)
|
||
|
opExpr1, opExpr2 = opExpr
|
||
|
term_name = f"{opExpr1}{opExpr2} term"
|
||
|
else:
|
||
|
term_name = f"{opExpr} term"
|
||
|
|
||
|
if not 1 <= arity <= 3:
|
||
|
raise ValueError("operator must be unary (1), binary (2), or ternary (3)")
|
||
|
|
||
|
if rightLeftAssoc not in (OpAssoc.LEFT, OpAssoc.RIGHT):
|
||
|
raise ValueError("operator must indicate right or left associativity")
|
||
|
|
||
|
thisExpr: ParserElement = Forward().set_name(term_name)
|
||
|
thisExpr = typing.cast(Forward, thisExpr)
|
||
|
if rightLeftAssoc is OpAssoc.LEFT:
|
||
|
if arity == 1:
|
||
|
matchExpr = _FB(lastExpr + opExpr) + Group(lastExpr + opExpr[1, ...])
|
||
|
elif arity == 2:
|
||
|
if opExpr is not None:
|
||
|
matchExpr = _FB(lastExpr + opExpr + lastExpr) + Group(
|
||
|
lastExpr + (opExpr + lastExpr)[1, ...]
|
||
|
)
|
||
|
else:
|
||
|
matchExpr = _FB(lastExpr + lastExpr) + Group(lastExpr[2, ...])
|
||
|
elif arity == 3:
|
||
|
matchExpr = _FB(
|
||
|
lastExpr + opExpr1 + lastExpr + opExpr2 + lastExpr
|
||
|
) + Group(lastExpr + OneOrMore(opExpr1 + lastExpr + opExpr2 + lastExpr))
|
||
|
elif rightLeftAssoc is OpAssoc.RIGHT:
|
||
|
if arity == 1:
|
||
|
# try to avoid LR with this extra test
|
||
|
if not isinstance(opExpr, Opt):
|
||
|
opExpr = Opt(opExpr)
|
||
|
matchExpr = _FB(opExpr.expr + thisExpr) + Group(opExpr + thisExpr)
|
||
|
elif arity == 2:
|
||
|
if opExpr is not None:
|
||
|
matchExpr = _FB(lastExpr + opExpr + thisExpr) + Group(
|
||
|
lastExpr + (opExpr + thisExpr)[1, ...]
|
||
|
)
|
||
|
else:
|
||
|
matchExpr = _FB(lastExpr + thisExpr) + Group(
|
||
|
lastExpr + thisExpr[1, ...]
|
||
|
)
|
||
|
elif arity == 3:
|
||
|
matchExpr = _FB(
|
||
|
lastExpr + opExpr1 + thisExpr + opExpr2 + thisExpr
|
||
|
) + Group(lastExpr + opExpr1 + thisExpr + opExpr2 + thisExpr)
|
||
|
if pa:
|
||
|
if isinstance(pa, (tuple, list)):
|
||
|
matchExpr.set_parse_action(*pa)
|
||
|
else:
|
||
|
matchExpr.set_parse_action(pa)
|
||
|
thisExpr <<= (matchExpr | lastExpr).setName(term_name)
|
||
|
lastExpr = thisExpr
|
||
|
ret <<= lastExpr
|
||
|
return ret
|
||
|
|
||
|
|
||
|
def indentedBlock(blockStatementExpr, indentStack, indent=True, backup_stacks=[]):
|
||
|
"""
|
||
|
(DEPRECATED - use :class:`IndentedBlock` class instead)
|
||
|
Helper method for defining space-delimited indentation blocks,
|
||
|
such as those used to define block statements in Python source code.
|
||
|
|
||
|
Parameters:
|
||
|
|
||
|
- ``blockStatementExpr`` - expression defining syntax of statement that
|
||
|
is repeated within the indented block
|
||
|
- ``indentStack`` - list created by caller to manage indentation stack
|
||
|
(multiple ``statementWithIndentedBlock`` expressions within a single
|
||
|
grammar should share a common ``indentStack``)
|
||
|
- ``indent`` - boolean indicating whether block must be indented beyond
|
||
|
the current level; set to ``False`` for block of left-most statements
|
||
|
(default= ``True``)
|
||
|
|
||
|
A valid block must contain at least one ``blockStatement``.
|
||
|
|
||
|
(Note that indentedBlock uses internal parse actions which make it
|
||
|
incompatible with packrat parsing.)
|
||
|
|
||
|
Example::
|
||
|
|
||
|
data = '''
|
||
|
def A(z):
|
||
|
A1
|
||
|
B = 100
|
||
|
G = A2
|
||
|
A2
|
||
|
A3
|
||
|
B
|
||
|
def BB(a,b,c):
|
||
|
BB1
|
||
|
def BBA():
|
||
|
bba1
|
||
|
bba2
|
||
|
bba3
|
||
|
C
|
||
|
D
|
||
|
def spam(x,y):
|
||
|
def eggs(z):
|
||
|
pass
|
||
|
'''
|
||
|
|
||
|
|
||
|
indentStack = [1]
|
||
|
stmt = Forward()
|
||
|
|
||
|
identifier = Word(alphas, alphanums)
|
||
|
funcDecl = ("def" + identifier + Group("(" + Opt(delimitedList(identifier)) + ")") + ":")
|
||
|
func_body = indentedBlock(stmt, indentStack)
|
||
|
funcDef = Group(funcDecl + func_body)
|
||
|
|
||
|
rvalue = Forward()
|
||
|
funcCall = Group(identifier + "(" + Opt(delimitedList(rvalue)) + ")")
|
||
|
rvalue << (funcCall | identifier | Word(nums))
|
||
|
assignment = Group(identifier + "=" + rvalue)
|
||
|
stmt << (funcDef | assignment | identifier)
|
||
|
|
||
|
module_body = stmt[1, ...]
|
||
|
|
||
|
parseTree = module_body.parseString(data)
|
||
|
parseTree.pprint()
|
||
|
|
||
|
prints::
|
||
|
|
||
|
[['def',
|
||
|
'A',
|
||
|
['(', 'z', ')'],
|
||
|
':',
|
||
|
[['A1'], [['B', '=', '100']], [['G', '=', 'A2']], ['A2'], ['A3']]],
|
||
|
'B',
|
||
|
['def',
|
||
|
'BB',
|
||
|
['(', 'a', 'b', 'c', ')'],
|
||
|
':',
|
||
|
[['BB1'], [['def', 'BBA', ['(', ')'], ':', [['bba1'], ['bba2'], ['bba3']]]]]],
|
||
|
'C',
|
||
|
'D',
|
||
|
['def',
|
||
|
'spam',
|
||
|
['(', 'x', 'y', ')'],
|
||
|
':',
|
||
|
[[['def', 'eggs', ['(', 'z', ')'], ':', [['pass']]]]]]]
|
||
|
"""
|
||
|
backup_stacks.append(indentStack[:])
|
||
|
|
||
|
def reset_stack():
|
||
|
indentStack[:] = backup_stacks[-1]
|
||
|
|
||
|
def checkPeerIndent(s, l, t):
|
||
|
if l >= len(s):
|
||
|
return
|
||
|
curCol = col(l, s)
|
||
|
if curCol != indentStack[-1]:
|
||
|
if curCol > indentStack[-1]:
|
||
|
raise ParseException(s, l, "illegal nesting")
|
||
|
raise ParseException(s, l, "not a peer entry")
|
||
|
|
||
|
def checkSubIndent(s, l, t):
|
||
|
curCol = col(l, s)
|
||
|
if curCol > indentStack[-1]:
|
||
|
indentStack.append(curCol)
|
||
|
else:
|
||
|
raise ParseException(s, l, "not a subentry")
|
||
|
|
||
|
def checkUnindent(s, l, t):
|
||
|
if l >= len(s):
|
||
|
return
|
||
|
curCol = col(l, s)
|
||
|
if not (indentStack and curCol in indentStack):
|
||
|
raise ParseException(s, l, "not an unindent")
|
||
|
if curCol < indentStack[-1]:
|
||
|
indentStack.pop()
|
||
|
|
||
|
NL = OneOrMore(LineEnd().set_whitespace_chars("\t ").suppress())
|
||
|
INDENT = (Empty() + Empty().set_parse_action(checkSubIndent)).set_name("INDENT")
|
||
|
PEER = Empty().set_parse_action(checkPeerIndent).set_name("")
|
||
|
UNDENT = Empty().set_parse_action(checkUnindent).set_name("UNINDENT")
|
||
|
if indent:
|
||
|
smExpr = Group(
|
||
|
Opt(NL)
|
||
|
+ INDENT
|
||
|
+ OneOrMore(PEER + Group(blockStatementExpr) + Opt(NL))
|
||
|
+ UNDENT
|
||
|
)
|
||
|
else:
|
||
|
smExpr = Group(
|
||
|
Opt(NL)
|
||
|
+ OneOrMore(PEER + Group(blockStatementExpr) + Opt(NL))
|
||
|
+ Opt(UNDENT)
|
||
|
)
|
||
|
|
||
|
# add a parse action to remove backup_stack from list of backups
|
||
|
smExpr.add_parse_action(
|
||
|
lambda: backup_stacks.pop(-1) and None if backup_stacks else None
|
||
|
)
|
||
|
smExpr.set_fail_action(lambda a, b, c, d: reset_stack())
|
||
|
blockStatementExpr.ignore(_bslash + LineEnd())
|
||
|
return smExpr.set_name("indented block")
|
||
|
|
||
|
|
||
|
# it's easy to get these comment structures wrong - they're very common, so may as well make them available
|
||
|
c_style_comment = Combine(Regex(r"/\*(?:[^*]|\*(?!/))*") + "*/").set_name(
|
||
|
"C style comment"
|
||
|
)
|
||
|
"Comment of the form ``/* ... */``"
|
||
|
|
||
|
html_comment = Regex(r"<!--[\s\S]*?-->").set_name("HTML comment")
|
||
|
"Comment of the form ``<!-- ... -->``"
|
||
|
|
||
|
rest_of_line = Regex(r".*").leave_whitespace().set_name("rest of line")
|
||
|
dbl_slash_comment = Regex(r"//(?:\\\n|[^\n])*").set_name("// comment")
|
||
|
"Comment of the form ``// ... (to end of line)``"
|
||
|
|
||
|
cpp_style_comment = Combine(
|
||
|
Regex(r"/\*(?:[^*]|\*(?!/))*") + "*/" | dbl_slash_comment
|
||
|
).set_name("C++ style comment")
|
||
|
"Comment of either form :class:`c_style_comment` or :class:`dbl_slash_comment`"
|
||
|
|
||
|
java_style_comment = cpp_style_comment
|
||
|
"Same as :class:`cpp_style_comment`"
|
||
|
|
||
|
python_style_comment = Regex(r"#.*").set_name("Python style comment")
|
||
|
"Comment of the form ``# ... (to end of line)``"
|
||
|
|
||
|
|
||
|
# build list of built-in expressions, for future reference if a global default value
|
||
|
# gets updated
|
||
|
_builtin_exprs: List[ParserElement] = [
|
||
|
v for v in vars().values() if isinstance(v, ParserElement)
|
||
|
]
|
||
|
|
||
|
|
||
|
# compatibility function, superseded by DelimitedList class
|
||
|
def delimited_list(
|
||
|
expr: Union[str, ParserElement],
|
||
|
delim: Union[str, ParserElement] = ",",
|
||
|
combine: bool = False,
|
||
|
min: typing.Optional[int] = None,
|
||
|
max: typing.Optional[int] = None,
|
||
|
*,
|
||
|
allow_trailing_delim: bool = False,
|
||
|
) -> ParserElement:
|
||
|
"""(DEPRECATED - use :class:`DelimitedList` class)"""
|
||
|
return DelimitedList(
|
||
|
expr, delim, combine, min, max, allow_trailing_delim=allow_trailing_delim
|
||
|
)
|
||
|
|
||
|
|
||
|
# pre-PEP8 compatible names
|
||
|
# fmt: off
|
||
|
opAssoc = OpAssoc
|
||
|
anyOpenTag = any_open_tag
|
||
|
anyCloseTag = any_close_tag
|
||
|
commonHTMLEntity = common_html_entity
|
||
|
cStyleComment = c_style_comment
|
||
|
htmlComment = html_comment
|
||
|
restOfLine = rest_of_line
|
||
|
dblSlashComment = dbl_slash_comment
|
||
|
cppStyleComment = cpp_style_comment
|
||
|
javaStyleComment = java_style_comment
|
||
|
pythonStyleComment = python_style_comment
|
||
|
|
||
|
@replaced_by_pep8(DelimitedList)
|
||
|
def delimitedList(): ...
|
||
|
|
||
|
@replaced_by_pep8(DelimitedList)
|
||
|
def delimited_list(): ...
|
||
|
|
||
|
@replaced_by_pep8(counted_array)
|
||
|
def countedArray(): ...
|
||
|
|
||
|
@replaced_by_pep8(match_previous_literal)
|
||
|
def matchPreviousLiteral(): ...
|
||
|
|
||
|
@replaced_by_pep8(match_previous_expr)
|
||
|
def matchPreviousExpr(): ...
|
||
|
|
||
|
@replaced_by_pep8(one_of)
|
||
|
def oneOf(): ...
|
||
|
|
||
|
@replaced_by_pep8(dict_of)
|
||
|
def dictOf(): ...
|
||
|
|
||
|
@replaced_by_pep8(original_text_for)
|
||
|
def originalTextFor(): ...
|
||
|
|
||
|
@replaced_by_pep8(nested_expr)
|
||
|
def nestedExpr(): ...
|
||
|
|
||
|
@replaced_by_pep8(make_html_tags)
|
||
|
def makeHTMLTags(): ...
|
||
|
|
||
|
@replaced_by_pep8(make_xml_tags)
|
||
|
def makeXMLTags(): ...
|
||
|
|
||
|
@replaced_by_pep8(replace_html_entity)
|
||
|
def replaceHTMLEntity(): ...
|
||
|
|
||
|
@replaced_by_pep8(infix_notation)
|
||
|
def infixNotation(): ...
|
||
|
# fmt: on
|