| 1 | n/a | # Copyright 2006 Google, Inc. All Rights Reserved. |
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| 2 | n/a | # Licensed to PSF under a Contributor Agreement. |
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| 3 | n/a | |
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| 4 | n/a | """Export the Python grammar and symbols.""" |
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| 5 | n/a | |
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| 6 | n/a | # Python imports |
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| 7 | n/a | import os |
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| 8 | n/a | |
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| 9 | n/a | # Local imports |
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| 10 | n/a | from .pgen2 import token |
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| 11 | n/a | from .pgen2 import driver |
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| 12 | n/a | from . import pytree |
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| 13 | n/a | |
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| 14 | n/a | # The grammar file |
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| 15 | n/a | _GRAMMAR_FILE = os.path.join(os.path.dirname(__file__), "Grammar.txt") |
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| 16 | n/a | _PATTERN_GRAMMAR_FILE = os.path.join(os.path.dirname(__file__), |
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| 17 | n/a | "PatternGrammar.txt") |
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| 18 | n/a | |
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| 19 | n/a | |
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| 20 | n/a | class Symbols(object): |
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| 21 | n/a | |
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| 22 | n/a | def __init__(self, grammar): |
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| 23 | n/a | """Initializer. |
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| 24 | n/a | |
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| 25 | n/a | Creates an attribute for each grammar symbol (nonterminal), |
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| 26 | n/a | whose value is the symbol's type (an int >= 256). |
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| 27 | n/a | """ |
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| 28 | n/a | for name, symbol in grammar.symbol2number.items(): |
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| 29 | n/a | setattr(self, name, symbol) |
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| 30 | n/a | |
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| 31 | n/a | |
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| 32 | n/a | python_grammar = driver.load_grammar(_GRAMMAR_FILE) |
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| 33 | n/a | |
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| 34 | n/a | python_symbols = Symbols(python_grammar) |
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| 35 | n/a | |
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| 36 | n/a | python_grammar_no_print_statement = python_grammar.copy() |
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| 37 | n/a | del python_grammar_no_print_statement.keywords["print"] |
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| 38 | n/a | |
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| 39 | n/a | pattern_grammar = driver.load_grammar(_PATTERN_GRAMMAR_FILE) |
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| 40 | n/a | pattern_symbols = Symbols(pattern_grammar) |
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