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"""
Python compatibility functions.
"""
import sys
import os
import warnings
from typing import Any, Callable
# ------------------------------------------------------------------------------
# Python 2/3 compatibility
fs_encoding = sys.getfilesystemencoding() or sys.getdefaultencoding()
def relpath(path: str, start: str = os.curdir) -> str:
"""Return a relative version of a path"""
try:
return os.path.relpath(path, start)
except ValueError:
return path
# convert_with_2to3():
# support for running 2to3 over config files
def convert_with_2to3(filepath: str) -> str:
from lib2to3.refactor import RefactoringTool, get_fixers_from_package
from lib2to3.pgen2.parse import ParseError
fixers = get_fixers_from_package("lib2to3.fixes")
refactoring_tool = RefactoringTool(fixers)
source = refactoring_tool._read_python_source(filepath)[0]
try:
tree = refactoring_tool.refactor_string(source, "conf.py")
except ParseError as err:
# do not propagate lib2to3 exceptions
lineno, offset = err.context[1]
# try to match ParseError details with SyntaxError details
raise SyntaxError(err.msg, (filepath, lineno, offset, err.value))
return str(tree)
def execfile_(filepath: str, _globals: Any, open: Callable = open) -> None:
with open(filepath, "rb") as f:
source = f.read()
# compile to a code object, handle syntax errors
filepath_enc = filepath.encode(fs_encoding)
try:
code = compile(source, filepath_enc, "exec")
except SyntaxError:
# maybe the file uses 2.x syntax; try to refactor to
# 3.x syntax using 2to3
source = convert_with_2to3(filepath)
code = compile(source, filepath_enc, "exec")
warnings.warn(
"Support for evaluating Python 2 syntax is deprecated "
"and will be removed in sphinx-intl 4.0. "
"Convert %s to Python 3 syntax.",
source=filepath,
)
exec(code, _globals)
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