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