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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
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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: simpleArith.py
Close
# # simpleArith.py # # Example of defining an arithmetic expression parser using # the infixNotation helper method in pyparsing. # # Copyright 2006, by Paul McGuire # import sys from pyparsing import * ppc = pyparsing_common ParserElement.enablePackrat() sys.setrecursionlimit(3000) integer = ppc.integer variable = Word(alphas, exact=1) operand = integer | variable expop = Literal("^") signop = oneOf("+ -") multop = oneOf("* /") plusop = oneOf("+ -") factop = Literal("!") # To use the infixNotation helper: # 1. Define the "atom" operand term of the grammar. # For this simple grammar, the smallest operand is either # and integer or a variable. This will be the first argument # to the infixNotation method. # 2. Define a list of tuples for each level of operator # precedence. Each tuple is of the form # (opExpr, numTerms, rightLeftAssoc, parseAction), where # - opExpr is the pyparsing expression for the operator; # may also be a string, which will be converted to a Literal # - numTerms is the number of terms for this operator (must # be 1 or 2) # - rightLeftAssoc is the indicator whether the operator is # right or left associative, using the pyparsing-defined # constants opAssoc.RIGHT and opAssoc.LEFT. # - parseAction is the parse action to be associated with # expressions matching this operator expression (the # parse action tuple member may be omitted) # 3. Call infixNotation passing the operand expression and # the operator precedence list, and save the returned value # as the generated pyparsing expression. You can then use # this expression to parse input strings, or incorporate it # into a larger, more complex grammar. # expr = infixNotation( operand, [ ("!", 1, opAssoc.LEFT), ("^", 2, opAssoc.RIGHT), (signop, 1, opAssoc.RIGHT), (multop, 2, opAssoc.LEFT), (plusop, 2, opAssoc.LEFT), ], ) test = [ "9 + 2 + 3", "9 + 2 * 3", "(9 + 2) * 3", "(9 + -2) * 3", "(9 + -2) * 3^2^2", "(9! + -2) * 3^2^2", "M*X + B", "M*(X + B)", "1+2*-3^4*5+-+-6", "(a + b)", "((a + b))", "(((a + b)))", "((((a + b))))", "((((((((((((((a + b))))))))))))))", ] for t in test: print(t) print(expr.parseString(t)) print("")