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12/11/2024 09:39:44 AM
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0README.html
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AcManForm.dfm
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LAparser.py
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Setup.ini
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SimpleCalc.py
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SingleForm.dfm
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TAP.py
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__init__.py
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adventureEngine.py
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antlr_grammar.py
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antlr_grammar_tests.py
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apicheck.py
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bf.py
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bigquery_view_parser.py
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booleansearchparser.py
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btpyparse.py
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builtin_parse_action_demo.py
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cLibHeader.py
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chemical_formulas.py
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commasep.py
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configParse.py
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cpp_enum_parser.py
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cuneiform_python.py
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datetime_parse_actions.py
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decaf_parser.py
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delta_time.py
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dfmparse.py
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dhcpd_leases_parser.py
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dictExample.py
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dictExample2.py
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directx_x_file_parser.py
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ebnf.py
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ebnftest.py
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email_address_parser.py
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eval_arith.py
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excel_expr.py
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fourFn.py
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gen_ctypes.py
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getNTPserversNew.py
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greeting.py
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greetingInGreek.py
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greetingInKorean.py
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groupUsingListAllMatches.py
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hola_mundo.py
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html_stripper.py
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html_table_parser.py
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httpServerLogParser.py
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idlParse.py
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include_preprocessor.py
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indentedGrammarExample.py
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indented_block_example.py
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inv_regex.py
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javascript_grammar.g
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jsonParser.py
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left_recursion.py
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lineno_example.py
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listAllMatches.py
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lua_parser.py
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lucene_grammar.py
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macro_expander.py
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make_diagram.py
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matchPreviousDemo.py
586 bytes
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mongodb_query_expression.py
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mozilla.ics
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mozillaCalendarParser.py
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nested.py
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nested_markup.py
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number_words.py
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numerics.py
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oc.py
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one_to_ninety_nine.py
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parseTabularData.py
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parse_python_value.py
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parse_results_sum_example.py
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partial_gene_match.py
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pgn.py
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position.py
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protobuf_parser.py
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pythonGrammarParser.py
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railroad_diagram_demo.py
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range_check.py
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readJson.py
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removeLineBreaks.py
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roman_numerals.py
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rosettacode.py
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scanExamples.py
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searchParserAppDemo.py
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searchparser.py
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select_parser.py
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sexpParser.py
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shapes.py
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simpleArith.py
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simpleBool.py
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simpleSQL.py
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simpleWiki.py
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snmp_api.h
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sql2dot.py
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stackish.py
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statemachine
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tag_emitter.py
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tag_metadata.py
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test_bibparse.py
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unicode_denormalizer.py
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urlExtractor.py
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urlExtractorNew.py
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verilog_parse.py
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withAttribute.py
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wordsToNum.py
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Editing: simpleBool.py
Close
# # simpleBool.py # # Example of defining a boolean logic parser using # the operatorGrammar helper method in pyparsing. # # In this example, parse actions associated with each # operator expression will "compile" the expression # into BoolXXX class instances, which can then # later be evaluated for their boolean value. # # Copyright 2006, by Paul McGuire # Updated 2013-Sep-14 - improved Python 2/3 cross-compatibility # Updated 2021-Sep-27 - removed Py2 compat; added type annotations # from typing import Callable, Iterable from pyparsing import infixNotation, opAssoc, Keyword, Word, alphas, ParserElement ParserElement.enablePackrat() # define classes to be built at parse time, as each matching # expression type is parsed class BoolOperand: def __init__(self, t): self.label = t[0] self.value = eval(t[0]) def __bool__(self) -> bool: return self.value def __str__(self) -> str: return self.label __repr__ = __str__ class BoolNot: def __init__(self, t): self.arg = t[0][1] def __bool__(self) -> bool: v = bool(self.arg) return not v def __str__(self) -> str: return "~" + str(self.arg) __repr__ = __str__ class BoolBinOp: repr_symbol: str = "" eval_fn: Callable[ [Iterable[bool]], bool ] = lambda _: False def __init__(self, t): self.args = t[0][0::2] def __str__(self) -> str: sep = f" {self.repr_symbol} " return f"({sep.join(map(str, self.args))})" def __bool__(self) -> bool: return self.eval_fn(bool(a) for a in self.args) class BoolAnd(BoolBinOp): repr_symbol = "&" eval_fn = all class BoolOr(BoolBinOp): repr_symbol = "|" eval_fn = any # define keywords and simple infix notation grammar for boolean # expressions TRUE = Keyword("True") FALSE = Keyword("False") NOT = Keyword("not") AND = Keyword("and") OR = Keyword("or") boolOperand = TRUE | FALSE | Word(alphas, max=1) boolOperand.setParseAction(BoolOperand).setName("bool_operand") # define expression, based on expression operand and # list of operations in precedence order boolExpr = infixNotation( boolOperand, [ (NOT, 1, opAssoc.RIGHT, BoolNot), (AND, 2, opAssoc.LEFT, BoolAnd), (OR, 2, opAssoc.LEFT, BoolOr), ], ).setName("boolean_expression") if __name__ == "__main__": p = True q = False r = True tests = [ ("p", True), ("q", False), ("p and q", False), ("p and not q", True), ("not not p", True), ("not(p and q)", True), ("q or not p and r", False), ("q or not p or not r", False), ("q or not (p and r)", False), ("p or q or r", True), ("p or q or r and False", True), ("(p or q or r) and False", False), ] print("p =", p) print("q =", q) print("r =", r) print() for test_string, expected in tests: res = boolExpr.parseString(test_string)[0] success = "PASS" if bool(res) == expected else "FAIL" print(test_string, "\n", res, "=", bool(res), "\n", success, "\n")