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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: roman_numerals.py
Close
# romanNumerals.py # # Copyright (c) 2006, 2019, Paul McGuire # import pyparsing as pp def roman_numeral_literal(numeral_string, value): return ( pp.Literal(numeral_string) .set_parse_action(pp.replace_with(value)) .leave_whitespace() ) one = roman_numeral_literal("I", 1) four = roman_numeral_literal("IV", 4) five = roman_numeral_literal("V", 5) nine = roman_numeral_literal("IX", 9) ten = roman_numeral_literal("X", 10) forty = roman_numeral_literal("XL", 40) fifty = roman_numeral_literal("L", 50) ninety = roman_numeral_literal("XC", 90) onehundred = roman_numeral_literal("C", 100) fourhundred = roman_numeral_literal("CD", 400) fivehundred = roman_numeral_literal("D", 500) ninehundred = roman_numeral_literal("CM", 900) onethousand = roman_numeral_literal("M", 1000) # lenient parser - passes all legal Roman numerals but does not detect illegal # numeral = ( # onethousand # | ninehundred # | fivehundred # | fourhundred # | onehundred # | ninety # | fifty # | forty # | ten # | nine # | five # | four # | one # ) # # roman_numeral = numeral[1, ...].set_parse_action(sum) # strict parser - rejects illegal Roman numerals roman_numeral = ( onethousand[...] + (ninehundred | fourhundred | fivehundred[0, 1] + onehundred[0, 3])[0, 1] + (ninety | forty | fifty[0, 1] + ten[0, 3])[0, 1] + (nine | four | five[0, 1] + one[0, 3])[0, 1] ).set_parse_action(sum) pp.autoname_elements() # uncomment to generate railroad diagram # roman_numeral.create_diagram("romanNumerals.html") # unit tests def make_roman_numeral(n): def add_digits(n, limit, c, s): while n >= limit: n -= limit s += c return n, s ret = "" n, ret = add_digits(n, 1000, "M", ret) n, ret = add_digits(n, 900, "CM", ret) n, ret = add_digits(n, 500, "D", ret) n, ret = add_digits(n, 400, "CD", ret) n, ret = add_digits(n, 100, "C", ret) n, ret = add_digits(n, 90, "XC", ret) n, ret = add_digits(n, 50, "L", ret) n, ret = add_digits(n, 40, "XL", ret) n, ret = add_digits(n, 10, "X", ret) n, ret = add_digits(n, 9, "IX", ret) n, ret = add_digits(n, 5, "V", ret) n, ret = add_digits(n, 4, "IV", ret) n, ret = add_digits(n, 1, "I", ret) return ret def main(): # make a string of all roman numerals from I to MMMMM tests = " ".join(make_roman_numeral(i) for i in range(1, 5000 + 1)) # parse each roman numeral, and populate map for validation below roman_int_map = {} for expected, (t, s, e) in enumerate(roman_numeral.scan_string(tests), start=1): orig = tests[s:e] assert t[0] == expected, f"==> Incorrect result for {orig}: {t}" roman_int_map[orig] = t[0] def verify_value(s, tokens): expected_value = roman_int_map[s] if tokens[0] != expected_value: raise Exception( f"incorrect value for {s} ({tokens[0]}), expected {expected_value}" ) success1, _ = roman_numeral.runTests( """\ XVI XXXIX XIV XIX MCMLXXX MMVI MMMMM """, parse_all=True, post_parse=verify_value, ) assert success1, "failed to parse one or more legal Roman numerals" print("\nRun failure tests") success2, _ = roman_numeral.runTests( """\ # too many X's XXXX # X after XL XLX """, parse_all=True, failure_tests=True, ) assert success2, "parsed one or more illegal Roman numerals" if __name__ == "__main__": main()