X-Git-Url: https://git.madduck.net/etc/vim.git/blobdiff_plain/9138a75b759ecb690d63924503f88bfbc82d4862..9ef8e6c9b0090d787953bcd3c46a8942483fcc6b:/blib2to3/pgen2/driver.py diff --git a/blib2to3/pgen2/driver.py b/blib2to3/pgen2/driver.py index 5cdd2e5..052c948 100644 --- a/blib2to3/pgen2/driver.py +++ b/blib2to3/pgen2/driver.py @@ -22,27 +22,49 @@ 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): - def __init__(self, grammar, convert=None, logger=None): +class Driver(object): + def __init__( + self, + grammar: Grammar, + convert: Optional[_Convert] = None, + logger: Optional[Logger] = None, + ) -> None: self.grammar = grammar if logger is None: - logger = logging.getLogger() + 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) p.setup() lineno = 1 column = 0 + indent_columns = [] type = value = start = end = line_text = None prefix = "" for quintuple in tokens: @@ -67,22 +89,22 @@ 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) - if type in {token.INDENT, token.DEDENT}: - _prefix = 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 prefix = "" + value = "" + elif type == token.DEDENT: + _indent_col = indent_columns.pop() + prefix, _prefix = self._partially_consume_prefix(prefix, _indent_col) if p.addtoken(type, value, (prefix, start)): if debug: self.logger.debug("Stop.") break prefix = "" - if type == token.INDENT: - if _prefix.startswith(value): - # Don't double-indent. Since we're delaying the prefix that - # would normally belong to INDENT, we need to put the value - # at the end versus at the beginning. - _prefix = _prefix[len(value):] + value if type in {token.INDENT, token.DEDENT}: prefix = _prefix lineno, column = end @@ -91,46 +113,87 @@ 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) + 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) + tokens = tokenize.generate_tokens( + io.StringIO(text).readline, grammar=self.grammar + ) return self.parse_tokens(tokens, debug) + 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 current_line.strip() and current_column < column: + res = "".join(lines) + return res, prefix[len(res) :] -def _generate_pickle_name(gt): + lines.append(current_line) + current_line = "" + current_column = 0 + wait_for_nl = False + elif char in " \t": + current_column += 1 + elif char == "\n": + # unexpected empty line + current_column = 0 + else: + # indent is finished + wait_for_nl = True + return "".join(lines), current_line + + +def _generate_pickle_name(gt: Path, cache_dir: Optional[Path] = None) -> Text: head, tail = os.path.splitext(gt) if tail == ".txt": tail = "" - return head + tail + ".".join(map(str, sys.version_info)) + ".pickle" + name = head + tail + ".".join(map(str, sys.version_info)) + ".pickle" + if cache_dir: + return os.path.join(cache_dir, os.path.basename(name)) + else: + 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() + 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: @@ -143,7 +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 @@ -152,7 +215,9 @@ def _newer(a, b): return os.path.getmtime(a) >= os.path.getmtime(b) -def load_packaged_grammar(package, grammar_source): +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 @@ -164,26 +229,28 @@ def load_packaged_grammar(package, grammar_source): """ if os.path.isfile(grammar_source): - return load_grammar(grammar_source) - pickled_name = _generate_pickle_name(os.path.basename(grammar_source)) + gp = _generate_pickle_name(grammar_source, cache_dir) if cache_dir else 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()))