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133 lines
4.3 KiB
Python
133 lines
4.3 KiB
Python
import importlib.util
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import io
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import os
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import pathlib
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import sys
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import textwrap
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import tokenize
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import token
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from typing import Any, cast, Dict, IO, Type, Final
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from pegen.build import compile_c_extension
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from pegen.c_generator import CParserGenerator
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from pegen.grammar import Grammar
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from pegen.grammar_parser import GeneratedParser as GrammarParser
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from pegen.parser import Parser
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from pegen.python_generator import PythonParserGenerator
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from pegen.tokenizer import Tokenizer
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ALL_TOKENS = token.tok_name
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EXACT_TOKENS = token.EXACT_TOKEN_TYPES # type: ignore
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NON_EXACT_TOKENS = {
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name for index, name in token.tok_name.items() if index not in EXACT_TOKENS.values()
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}
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def generate_parser(grammar: Grammar) -> Type[Parser]:
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# Generate a parser.
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out = io.StringIO()
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genr = PythonParserGenerator(grammar, out)
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genr.generate("<string>")
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# Load the generated parser class.
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ns: Dict[str, Any] = {}
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exec(out.getvalue(), ns)
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return ns["GeneratedParser"]
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def run_parser(file: IO[bytes], parser_class: Type[Parser], *, verbose: bool = False) -> Any:
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# Run a parser on a file (stream).
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tokenizer = Tokenizer(tokenize.generate_tokens(file.readline)) # type: ignore # typeshed issue #3515
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parser = parser_class(tokenizer, verbose=verbose)
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result = parser.start()
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if result is None:
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raise parser.make_syntax_error()
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return result
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def parse_string(
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source: str, parser_class: Type[Parser], *, dedent: bool = True, verbose: bool = False
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) -> Any:
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# Run the parser on a string.
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if dedent:
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source = textwrap.dedent(source)
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file = io.StringIO(source)
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return run_parser(file, parser_class, verbose=verbose) # type: ignore # typeshed issue #3515
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def make_parser(source: str) -> Type[Parser]:
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# Combine parse_string() and generate_parser().
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grammar = parse_string(source, GrammarParser)
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return generate_parser(grammar)
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def import_file(full_name: str, path: str) -> Any:
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"""Import a python module from a path"""
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spec = importlib.util.spec_from_file_location(full_name, path)
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mod = importlib.util.module_from_spec(spec)
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# We assume this is not None and has an exec_module() method.
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# See https://docs.python.org/3/reference/import.html?highlight=exec_module#loading
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loader = cast(Any, spec.loader)
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loader.exec_module(mod)
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return mod
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def generate_c_parser_source(grammar: Grammar) -> str:
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out = io.StringIO()
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genr = CParserGenerator(grammar, ALL_TOKENS, EXACT_TOKENS, NON_EXACT_TOKENS, out)
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genr.generate("<string>")
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return out.getvalue()
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def generate_parser_c_extension(
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grammar: Grammar, path: pathlib.PurePath, debug: bool = False
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) -> Any:
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"""Generate a parser c extension for the given grammar in the given path
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Returns a module object with a parse_string() method.
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TODO: express that using a Protocol.
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"""
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# Make sure that the working directory is empty: reusing non-empty temporary
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# directories when generating extensions can lead to segmentation faults.
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# Check issue #95 (https://github.com/gvanrossum/pegen/issues/95) for more
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# context.
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assert not os.listdir(path)
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source = path / "parse.c"
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with open(source, "w", encoding="utf-8") as file:
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genr = CParserGenerator(
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grammar, ALL_TOKENS, EXACT_TOKENS, NON_EXACT_TOKENS, file, debug=debug
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)
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genr.generate("parse.c")
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compile_c_extension(str(source), build_dir=str(path))
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def print_memstats() -> bool:
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MiB: Final = 2 ** 20
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try:
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import psutil # type: ignore
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except ImportError:
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return False
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print("Memory stats:")
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process = psutil.Process()
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meminfo = process.memory_info()
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res = {}
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res["rss"] = meminfo.rss / MiB
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res["vms"] = meminfo.vms / MiB
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if sys.platform == "win32":
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res["maxrss"] = meminfo.peak_wset / MiB
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else:
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# See https://stackoverflow.com/questions/938733/total-memory-used-by-python-process
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import resource # Since it doesn't exist on Windows.
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rusage = resource.getrusage(resource.RUSAGE_SELF)
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if sys.platform == "darwin":
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factor = 1
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else:
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factor = 1024 # Linux
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res["maxrss"] = rusage.ru_maxrss * factor / MiB
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for key, value in res.items():
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print(f" {key:12.12s}: {value:10.0f} MiB")
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return True
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