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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
853 bytes
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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: pythonGrammarParser.py
Close
# pythonGrammarParser.py # # Copyright, 2006, by Paul McGuire # from pyparsing import * # should probably read this from the Grammar file provided with the Python source, but # this just skips that step and inlines the bnf text directly - this grammar was taken from # Python 2.4.1 # grammar = r""" # Grammar for Python # Note: Changing the grammar specified in this file will most likely # require corresponding changes in the parser module # (../Modules/parsermodule.c). If you can't make the changes to # that module yourself, please coordinate the required changes # with someone who can; ask around on python-dev for help. Fred # Drake <fdrake@acm.org> will probably be listening there. # Commands for Kees Blom's railroad program #diagram:token NAME #diagram:token NUMBER #diagram:token STRING #diagram:token NEWLINE #diagram:token ENDMARKER #diagram:token INDENT #diagram:output\input python.bla #diagram:token DEDENT #diagram:output\textwidth 20.04cm\oddsidemargin 0.0cm\evensidemargin 0.0cm #diagram:rules # Start symbols for the grammar: # single_input is a single interactive statement; # file_input is a module or sequence of commands read from an input file; # eval_input is the input for the eval() and input() functions. # NB: compound_stmt in single_input is followed by extra NEWLINE! single_input: NEWLINE | simple_stmt | compound_stmt NEWLINE file_input: (NEWLINE | stmt)* ENDMARKER eval_input: testlist NEWLINE* ENDMARKER decorator: '@' dotted_name [ '(' [arglist] ')' ] NEWLINE decorators: decorator+ funcdef: [decorators] 'def' NAME parameters ':' suite parameters: '(' [varargslist] ')' varargslist: (fpdef ['=' test] ',')* ('*' NAME [',' '**' NAME] | '**' NAME) | fpdef ['=' test] (',' fpdef ['=' test])* [','] fpdef: NAME | '(' fplist ')' fplist: fpdef (',' fpdef)* [','] stmt: simple_stmt | compound_stmt simple_stmt: small_stmt (';' small_stmt)* [';'] NEWLINE small_stmt: expr_stmt | print_stmt | del_stmt | pass_stmt | flow_stmt | import_stmt | global_stmt | exec_stmt | assert_stmt expr_stmt: testlist (augassign testlist | ('=' testlist)*) augassign: '+=' | '-=' | '*=' | '/=' | '%=' | '&=' | '|=' | '^=' | '<<=' | '>>=' | '**=' | '//=' # For normal assignments, additional restrictions enforced by the interpreter print_stmt: 'print' ( [ test (',' test)* [','] ] | '>>' test [ (',' test)+ [','] ] ) del_stmt: 'del' exprlist pass_stmt: 'pass' flow_stmt: break_stmt | continue_stmt | return_stmt | raise_stmt | yield_stmt break_stmt: 'break' continue_stmt: 'continue' return_stmt: 'return' [testlist] yield_stmt: 'yield' testlist raise_stmt: 'raise' [test [',' test [',' test]]] import_stmt: import_name | import_from import_name: 'import' dotted_as_names import_from: 'from' dotted_name 'import' ('*' | '(' import_as_names ')' | import_as_names) import_as_name: NAME [NAME NAME] dotted_as_name: dotted_name [NAME NAME] import_as_names: import_as_name (',' import_as_name)* [','] dotted_as_names: dotted_as_name (',' dotted_as_name)* dotted_name: NAME ('.' NAME)* global_stmt: 'global' NAME (',' NAME)* exec_stmt: 'exec' expr ['in' test [',' test]] assert_stmt: 'assert' test [',' test] #35 compound_stmt: if_stmt | while_stmt | for_stmt | try_stmt | funcdef | classdef if_stmt: 'if' test ':' suite ('elif' test ':' suite)* ['else' ':' suite] while_stmt: 'while' test ':' suite ['else' ':' suite] for_stmt: 'for' exprlist 'in' testlist ':' suite ['else' ':' suite] try_stmt: ('try' ':' suite (except_clause ':' suite)+ #diagram:break ['else' ':' suite] | 'try' ':' suite 'finally' ':' suite) # NB compile.c makes sure that the default except clause is last except_clause: 'except' [test [',' test]] suite: simple_stmt | NEWLINE INDENT stmt+ DEDENT test: and_test ('or' and_test)* | lambdef and_test: not_test ('and' not_test)* not_test: 'not' not_test | comparison comparison: expr (comp_op expr)* comp_op: '<'|'>'|'=='|'>='|'<='|'<>'|'!='|'in'|'not' 'in'|'is'|'is' 'not' expr: xor_expr ('|' xor_expr)* xor_expr: and_expr ('^' and_expr)* and_expr: shift_expr ('&' shift_expr)* shift_expr: arith_expr (('<<'|'>>') arith_expr)* arith_expr: term (('+'|'-') term)* term: factor (('*'|'/'|'%'|'//') factor)* factor: ('+'|'-'|'~') factor | power power: atom trailer* ['**' factor] atom: '(' [testlist_gexp] ')' | '[' [listmaker] ']' | '{' [dictmaker] '}' | '`' testlist1 '`' | NAME | NUMBER | STRING+ listmaker: test ( list_for | (',' test)* [','] ) testlist_gexp: test ( gen_for | (',' test)* [','] ) lambdef: 'lambda' [varargslist] ':' test trailer: '(' [arglist] ')' | '[' subscriptlist ']' | '.' NAME subscriptlist: subscript (',' subscript)* [','] subscript: '.' '.' '.' | test | [test] ':' [test] [sliceop] sliceop: ':' [test] exprlist: expr (',' expr)* [','] testlist: test (',' test)* [','] testlist_safe: test [(',' test)+ [',']] dictmaker: test ':' test (',' test ':' test)* [','] classdef: 'class' NAME ['(' testlist ')'] ':' suite arglist: (argument ',')* (argument [',']| '*' test [',' '**' test] | '**' test) argument: [test '='] test [gen_for] # Really [keyword '='] test list_iter: list_for | list_if list_for: 'for' exprlist 'in' testlist_safe [list_iter] list_if: 'if' test [list_iter] gen_iter: gen_for | gen_if gen_for: 'for' exprlist 'in' test [gen_iter] gen_if: 'if' test [gen_iter] testlist1: test (',' test)* # not used in grammar, but may appear in "node" passed from Parser to Compiler encoding_decl: NAME """ class SemanticGroup: def __init__(self, contents): self.contents = contents while self.contents[-1].__class__ == self.__class__: self.contents = self.contents[:-1] + self.contents[-1].contents def __str__(self): return "{}({})".format( self.label, " ".join([isinstance(c, str) and c or str(c) for c in self.contents]), ) class OrList(SemanticGroup): label = "OR" pass class AndList(SemanticGroup): label = "AND" pass class OptionalGroup(SemanticGroup): label = "OPT" pass class Atom(SemanticGroup): def __init__(self, contents): if len(contents) > 1: self.rep = contents[1] else: self.rep = "" if isinstance(contents, str): self.contents = contents else: self.contents = contents[0] def __str__(self): return "{}{}".format(self.rep, self.contents) def makeGroupObject(cls): def groupAction(s, l, t): try: return cls(t[0].asList()) except Exception: return cls(t) return groupAction # bnf punctuation LPAREN = Suppress("(") RPAREN = Suppress(")") LBRACK = Suppress("[") RBRACK = Suppress("]") COLON = Suppress(":") ALT_OP = Suppress("|") # bnf grammar ident = Word(alphanums + "_") bnfToken = Word(alphanums + "_") + ~FollowedBy(":") repSymbol = oneOf("* +") bnfExpr = Forward() optionalTerm = Group(LBRACK + bnfExpr + RBRACK).setParseAction( makeGroupObject(OptionalGroup) ) bnfTerm = ( (bnfToken | quotedString | optionalTerm | (LPAREN + bnfExpr + RPAREN)) + Optional(repSymbol) ).setParseAction(makeGroupObject(Atom)) andList = Group(bnfTerm + OneOrMore(bnfTerm)).setParseAction(makeGroupObject(AndList)) bnfFactor = andList | bnfTerm orList = Group(bnfFactor + OneOrMore(ALT_OP + bnfFactor)).setParseAction( makeGroupObject(OrList) ) bnfExpr << (orList | bnfFactor) bnfLine = ident + COLON + bnfExpr bnfComment = "#" + restOfLine # build return tokens as a dictionary bnf = Dict(OneOrMore(Group(bnfLine))) bnf.ignore(bnfComment) # bnf is defined, parse the grammar text bnfDefs = bnf.parseString(grammar) # correct answer is 78 expected = 78 assert len(bnfDefs) == expected, "Error, found %d BNF defns, expected %d" % ( len(bnfDefs), expected, ) # list out defns in order they were parsed (to verify accuracy of parsing) for k, v in bnfDefs: print(k, "=", v) print() # list out parsed grammar defns (demonstrates dictionary access to parsed tokens) for k in list(bnfDefs.keys()): print(k, "=", bnfDefs[k])