X-Git-Url: https://git.madduck.net/etc/vim.git/blobdiff_plain/448885b256ca1741fda7c4ef17f80f750ea614c0..9ef8e6c9b0090d787953bcd3c46a8942483fcc6b:/blib2to3/pgen2/driver.py?ds=sidebyside diff --git a/blib2to3/pgen2/driver.py b/blib2to3/pgen2/driver.py index 6452c57..052c948 100644 --- a/blib2to3/pgen2/driver.py +++ b/blib2to3/pgen2/driver.py @@ -22,26 +22,42 @@ import os import logging import pkgutil import sys +from typing import ( + Any, + Callable, + IO, + Iterable, + List, + Optional, + Text, + Tuple, + Union, + Sequence, +) # Pgen imports from . import grammar, parse, token, tokenize, pgen +from logging import Logger +from blib2to3.pytree import _Convert, NL +from blib2to3.pgen2.grammar import Grammar +Path = Union[str, "os.PathLike[str]"] -class Driver(object): +class Driver(object): def __init__( self, - grammar, - convert=None, - logger=None, - ): + grammar: Grammar, + convert: Optional[_Convert] = None, + logger: Optional[Logger] = None, + ) -> None: self.grammar = grammar if logger is None: logger = logging.getLogger(__name__) self.logger = logger self.convert = convert - def parse_tokens(self, tokens, debug=False): + def parse_tokens(self, tokens: Iterable[Any], debug: bool = False) -> NL: """Parse a series of tokens and return the syntax tree.""" # XXX Move the prefix computation into a wrapper around tokenize. p = parse.Parser(self.grammar, self.convert) @@ -73,8 +89,9 @@ class Driver(object): if type == token.OP: type = grammar.opmap[value] if debug: - self.logger.debug("%s %r (prefix=%r)", - token.tok_name[type], value, prefix) + self.logger.debug( + "%s %r (prefix=%r)", token.tok_name[type], value, prefix + ) if type == token.INDENT: indent_columns.append(len(value)) _prefix = prefix + value @@ -96,61 +113,63 @@ class Driver(object): column = 0 else: # We never broke out -- EOF is too soon (how can this happen???) - raise parse.ParseError("incomplete input", - type, value, (prefix, start)) + assert start is not None + raise parse.ParseError("incomplete input", type, value, (prefix, start)) + assert p.rootnode is not None return p.rootnode - def parse_stream_raw(self, stream, debug=False): + def parse_stream_raw(self, stream: IO[Text], debug: bool = False) -> NL: """Parse a stream and return the syntax tree.""" tokens = tokenize.generate_tokens(stream.readline, grammar=self.grammar) return self.parse_tokens(tokens, debug) - def parse_stream(self, stream, debug=False): + def parse_stream(self, stream: IO[Text], debug: bool = False) -> NL: """Parse a stream and return the syntax tree.""" return self.parse_stream_raw(stream, debug) - def parse_file(self, filename, encoding=None, debug=False): + def parse_file( + self, filename: Path, encoding: Optional[Text] = None, debug: bool = False, + ) -> NL: """Parse a file and return the syntax tree.""" with io.open(filename, "r", encoding=encoding) as stream: return self.parse_stream(stream, debug) - def parse_string(self, text, debug=False): + def parse_string(self, text: Text, debug: bool = False) -> NL: """Parse a string and return the syntax tree.""" tokens = tokenize.generate_tokens( - io.StringIO(text).readline, - grammar=self.grammar + io.StringIO(text).readline, grammar=self.grammar ) return self.parse_tokens(tokens, debug) - def _partially_consume_prefix(self, prefix, column): - lines = [] + def _partially_consume_prefix(self, prefix: Text, column: int) -> Tuple[Text, Text]: + lines: List[str] = [] current_line = "" current_column = 0 wait_for_nl = False for char in prefix: current_line += char if wait_for_nl: - if char == '\n': + if char == "\n": if current_line.strip() and current_column < column: - res = ''.join(lines) - return res, prefix[len(res):] + res = "".join(lines) + return res, prefix[len(res) :] lines.append(current_line) current_line = "" current_column = 0 wait_for_nl = False - elif char in ' \t': + elif char in " \t": current_column += 1 - elif char == '\n': + elif char == "\n": # unexpected empty line current_column = 0 else: # indent is finished wait_for_nl = True - return ''.join(lines), current_line + return "".join(lines), current_line -def _generate_pickle_name(gt, cache_dir=None): +def _generate_pickle_name(gt: Path, cache_dir: Optional[Path] = None) -> Text: head, tail = os.path.splitext(gt) if tail == ".txt": tail = "" @@ -161,15 +180,20 @@ def _generate_pickle_name(gt, cache_dir=None): return name -def load_grammar(gt="Grammar.txt", gp=None, - save=True, force=False, logger=None): +def load_grammar( + gt: Text = "Grammar.txt", + gp: Optional[Text] = None, + save: bool = True, + force: bool = False, + logger: Optional[Logger] = None, +) -> Grammar: """Load the grammar (maybe from a pickle).""" if logger is None: logger = logging.getLogger(__name__) gp = _generate_pickle_name(gt) if gp is None else gp if force or not _newer(gp, gt): logger.info("Generating grammar tables from %s", gt) - g = pgen.generate_grammar(gt) + g: grammar.Grammar = pgen.generate_grammar(gt) if save: logger.info("Writing grammar tables to %s", gp) try: @@ -182,7 +206,7 @@ def load_grammar(gt="Grammar.txt", gp=None, return g -def _newer(a, b): +def _newer(a: Text, b: Text) -> bool: """Inquire whether file a was written since file b.""" if not os.path.exists(a): return False @@ -191,7 +215,9 @@ def _newer(a, b): return os.path.getmtime(a) >= os.path.getmtime(b) -def load_packaged_grammar(package, grammar_source, cache_dir=None): +def load_packaged_grammar( + package: str, grammar_source: Text, cache_dir: Optional[Path] = None +) -> grammar.Grammar: """Normally, loads a pickled grammar by doing pkgutil.get_data(package, pickled_grammar) where *pickled_grammar* is computed from *grammar_source* by adding the @@ -207,23 +233,24 @@ def load_packaged_grammar(package, grammar_source, cache_dir=None): return load_grammar(grammar_source, gp=gp) pickled_name = _generate_pickle_name(os.path.basename(grammar_source), cache_dir) data = pkgutil.get_data(package, pickled_name) + assert data is not None g = grammar.Grammar() g.loads(data) return g -def main(*args): +def main(*args: Text) -> bool: """Main program, when run as a script: produce grammar pickle files. Calls load_grammar for each argument, a path to a grammar text file. """ if not args: - args = sys.argv[1:] - logging.basicConfig(level=logging.INFO, stream=sys.stdout, - format='%(message)s') + args = tuple(sys.argv[1:]) + logging.basicConfig(level=logging.INFO, stream=sys.stdout, format="%(message)s") for gt in args: load_grammar(gt, save=True, force=True) return True + if __name__ == "__main__": sys.exit(int(not main()))