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                                                                                                                                                                                     import tokenize
from pathlib import Path

from prospector.exceptions import CouldNotHandleEncoding, PermissionMissing

# note: annotating return type with AnyStr does not work here for reasons I can't be bothered to work out
#       mypy complains with 'Incompatible return value type (got "str", expected "bytes")'


def read_py_file(filepath: Path):
    # see https://docs.python.org/3/library/tokenize.html#tokenize.detect_encoding
    # first just see if the file is properly encoded
    try:
        with open(filepath, "rb") as bfile_:
            tokenize.detect_encoding(bfile_.readline)
    except PermissionError as err:
        raise PermissionMissing(filepath) from err

    except SyntaxError as err:
        # this warning is issued:
        #   (1) in badly authored files (contains non-utf8 in a comment line)
        #   (2) a coding is specified, but wrong and
        #   (3) no coding is specified, and the default
        #       'utf-8' fails to decode.
        #   (4) the encoding specified by a pep263 declaration did not match
        #       with the encoding detected by inspecting the BOM
        raise CouldNotHandleEncoding(filepath) from err

    try:
        with tokenize.open(filepath) as file_:
            return file_.read()
        # this warning is issued:
        #   (1) if utf-8 is specified, but latin1 is used with something like \x0e9 appearing
        #       (see http://stackoverflow.com/a/5552623)
    except UnicodeDecodeError as err:
        raise CouldNotHandleEncoding(filepath) from err