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12/11/2024 09:39:44 AM
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0README.html
10.75 KB
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AcManForm.dfm
38.22 KB
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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
62.51 KB
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booleansearchparser.py
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btpyparse.py
4.16 KB
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builtin_parse_action_demo.py
817 bytes
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cLibHeader.py
853 bytes
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chemical_formulas.py
3.17 KB
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commasep.py
707 bytes
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configParse.py
2 KB
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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
2.98 KB
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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
518 bytes
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greetingInGreek.py
425 bytes
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greetingInKorean.py
495 bytes
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groupUsingListAllMatches.py
509 bytes
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hola_mundo.py
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html_stripper.py
1.68 KB
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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
2.63 KB
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indentedGrammarExample.py
1022 bytes
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indented_block_example.py
712 bytes
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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
1.41 KB
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lineno_example.py
1.49 KB
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listAllMatches.py
1.57 KB
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lua_parser.py
7.96 KB
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lucene_grammar.py
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macro_expander.py
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make_diagram.py
1.62 KB
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matchPreviousDemo.py
586 bytes
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mongodb_query_expression.py
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mozilla.ics
752 bytes
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mozillaCalendarParser.py
2.71 KB
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nested.py
579 bytes
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nested_markup.py
1.85 KB
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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
2.5 KB
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parse_results_sum_example.py
853 bytes
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partial_gene_match.py
2.33 KB
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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
1.55 KB
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range_check.py
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readJson.py
120.73 KB
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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
962 bytes
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searchparser.py
10.4 KB
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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
2.42 KB
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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
28.69 KB
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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
805 bytes
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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
31.15 KB
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withAttribute.py
912 bytes
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wordsToNum.py
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Editing: bf.py
Close
# bf.py # # Brainf*ck interpreter demo # # BF instructions (symbols): # + - increment value at the current pointer # - - decrement value at the current pointer # > - increment pointer # < - decrement pointer # , - input new byte value, store at the current pointer # . - output the byte at the current pointer # [] - evaluate value at current pointer, if nonzero, execute all statements in []'s and repeat # import pyparsing as pp # define the basic parser # define Literals for each symbol in the BF langauge PLUS, MINUS, GT, LT, INP, OUT, LBRACK, RBRACK = pp.Literal.using_each("+-<>,.[]") # use a pyparsing Forward for the recursive definition of an instruction that can # itself contain instructions instruction_expr = pp.Forward().set_name("instruction") # define a LOOP expression for the instructions enclosed in brackets; use a # pyparsing Group to wrap the instructions in a sub-list LOOP = pp.Group(LBRACK + instruction_expr[...] + RBRACK) # use '<<=' operator to insert expression definition into existing Forward instruction_expr <<= PLUS | MINUS | GT | LT | INP | OUT | LOOP program_expr = instruction_expr[...].set_name("program") # ignore everything that is not a BF symbol ignore_chars = pp.Word(pp.printables, exclude_chars="+-<>,.[]") program_expr.ignore(ignore_chars) class BFEngine: """ Brainf*ck execution environment, with a memory array and pointer. """ def __init__(self, memory_size: int = 1024): self._ptr = 0 self._memory_size = memory_size self._memory = [0] * self._memory_size @property def ptr(self): return self._ptr @ptr.setter def ptr(self, value): self._ptr = value % self._memory_size @property def at_ptr(self): return self._memory[self._ptr] @at_ptr.setter def at_ptr(self, value): self._memory[self._ptr] = value % 256 def output_value_at_ptr(self): print(chr(self.at_ptr), end="") def input_value(self): input_char = input() or "\0" self.at_ptr = ord(input_char[0]) def reset(self): self._ptr = 0 self._memory[:] = [0] * self._memory_size def dump_state(self): for i in range(30): print(f"{self._memory[i]:3d} ", end="") print() if self.ptr < 30: print(f" {' ' * self.ptr}^") # define executable classes for each instruction class Instruction: """Abstract class for all instruction classes to implement.""" def __init__(self, tokens): self.tokens = tokens def execute(self, bf_engine: BFEngine): raise NotImplementedError() class IncrPtr(Instruction): def execute(self, bf_engine: BFEngine): bf_engine.ptr += 1 class DecrPtr(Instruction): def execute(self, bf_engine: BFEngine): bf_engine.ptr -= 1 class IncrPtrValue(Instruction): def execute(self, bf_engine: BFEngine): bf_engine.at_ptr += 1 class DecrPtrValue(Instruction): def execute(self, bf_engine: BFEngine): bf_engine.at_ptr -= 1 class OutputPtrValue(Instruction): def execute(self, bf_engine: BFEngine): bf_engine.output_value_at_ptr() class InputPtrValue(Instruction): def execute(self, bf_engine: BFEngine): bf_engine.input_value() class RunInstructionLoop(Instruction): def __init__(self, tokens): super().__init__(tokens) self.instructions = self.tokens[0][1:-1] def execute(self, bf_engine: BFEngine): while bf_engine.at_ptr: for i in self.instructions: i.execute(bf_engine) # add parse actions to all BF instruction expressions PLUS.add_parse_action(IncrPtrValue) MINUS.add_parse_action(DecrPtrValue) GT.add_parse_action(IncrPtr) LT.add_parse_action(DecrPtr) OUT.add_parse_action(OutputPtrValue) INP.add_parse_action(InputPtrValue) LOOP.add_parse_action(RunInstructionLoop) @program_expr.add_parse_action def run_program(tokens): bf = BFEngine() for t in tokens: t.execute(bf) print() # generate railroad diagram program_expr.create_diagram("bf.html") # execute an example BF program hw = "+[-->-[>>+>-----<<]<--<---]>-.>>>+.>>..+++[.>]<<<<.+++.------.<<-.>>>>+." program_expr.parse_string(hw)