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# Copyright (c) Meta Platforms, Inc. and affiliates.
#
# This source code is licensed under the MIT license found in the
# LICENSE file in the root directory of this source tree.
# pyre-unsafe
from typing import Any, Iterable, Mapping, Sequence
from libcst._parser.base_parser import BaseParser
from libcst._parser.grammar import get_nonterminal_conversions, get_terminal_conversions
from libcst._parser.parso.pgen2.generator import Grammar
from libcst._parser.parso.python.token import TokenType
from libcst._parser.types.config import ParserConfig
from libcst._parser.types.conversions import NonterminalConversion, TerminalConversion
from libcst._parser.types.token import Token
class PythonCSTParser(BaseParser[Token, TokenType, Any]):
config: ParserConfig
terminal_conversions: Mapping[str, TerminalConversion]
nonterminal_conversions: Mapping[str, NonterminalConversion]
def __init__(
self,
*,
tokens: Iterable[Token],
config: ParserConfig,
pgen_grammar: "Grammar[TokenType]",
start_nonterminal: str = "file_input",
) -> None:
super().__init__(
tokens=tokens,
lines=config.lines,
pgen_grammar=pgen_grammar,
start_nonterminal=start_nonterminal,
)
self.config = config
self.terminal_conversions = get_terminal_conversions()
self.nonterminal_conversions = get_nonterminal_conversions(
config.version, config.future_imports
)
def convert_nonterminal(self, nonterminal: str, children: Sequence[Any]) -> Any:
return self.nonterminal_conversions[nonterminal](self.config, children)
def convert_terminal(self, token: Token) -> Any:
return self.terminal_conversions[token.type.name](self.config, token)
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