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py_compile.py8.0 KB · 217 lines
"""Routine to "compile" a .py file to a .pyc file. This module has intimate knowledge of the format of .pyc files.""" import enumimport importlib._bootstrap_externalimport importlib.machineryimport importlib.utilimport osimport os.pathimport sysimport traceback __all__ = ["compile", "main", "PyCompileError", "PycInvalidationMode"]  class PyCompileError(Exception):    """Exception raised when an error occurs while attempting to    compile the file.     To raise this exception, use         raise PyCompileError(exc_type,exc_value,file[,msg])     where         exc_type:   exception type to be used in error message                    type name can be accesses as class variable                    'exc_type_name'         exc_value:  exception value to be used in error message                    can be accesses as class variable 'exc_value'         file:       name of file being compiled to be used in error message                    can be accesses as class variable 'file'         msg:        string message to be written as error message                    If no value is given, a default exception message will be                    given, consistent with 'standard' py_compile output.                    message (or default) can be accesses as class variable                    'msg'     """     def __init__(self, exc_type, exc_value, file, msg=''):        exc_type_name = exc_type.__name__        if exc_type is SyntaxError:            tbtext = ''.join(traceback.format_exception_only(                exc_type, exc_value))            errmsg = tbtext.replace('File "<string>"', 'File "%s"' % file)        else:            errmsg = "Sorry: %s: %s" % (exc_type_name,exc_value)         Exception.__init__(self,msg or errmsg,exc_type_name,exc_value,file)         self.exc_type_name = exc_type_name        self.exc_value = exc_value        self.file = file        self.msg = msg or errmsg     def __str__(self):        return self.msg  class PycInvalidationMode(enum.Enum):    TIMESTAMP = 1    CHECKED_HASH = 2    UNCHECKED_HASH = 3  def _get_default_invalidation_mode():    if (os.environ.get('SOURCE_DATE_EPOCH') and not            os.environ.get('RPM_BUILD_ROOT')):        return PycInvalidationMode.CHECKED_HASH    else:        return PycInvalidationMode.TIMESTAMP  def compile(file, cfile=None, dfile=None, doraise=False, optimize=-1,            invalidation_mode=None, quiet=0):    """Byte-compile one Python source file to Python bytecode.     :param file: The source file name.    :param cfile: The target byte compiled file name.  When not given, this        defaults to the PEP 3147/PEP 488 location.    :param dfile: Purported file name, i.e. the file name that shows up in        error messages.  Defaults to the source file name.    :param doraise: Flag indicating whether or not an exception should be        raised when a compile error is found.  If an exception occurs and this        flag is set to False, a string indicating the nature of the exception        will be printed, and the function will return to the caller. If an        exception occurs and this flag is set to True, a PyCompileError        exception will be raised.    :param optimize: The optimization level for the compiler.  Valid values        are -1, 0, 1 and 2.  A value of -1 means to use the optimization        level of the current interpreter, as given by -O command line options.    :param invalidation_mode:    :param quiet: Return full output with False or 0, errors only with 1,        and no output with 2.     :return: Path to the resulting byte compiled file.     Note that it isn't necessary to byte-compile Python modules for    execution efficiency -- Python itself byte-compiles a module when    it is loaded, and if it can, writes out the bytecode to the    corresponding .pyc file.     However, if a Python installation is shared between users, it is a    good idea to byte-compile all modules upon installation, since    other users may not be able to write in the source directories,    and thus they won't be able to write the .pyc file, and then    they would be byte-compiling every module each time it is loaded.    This can slow down program start-up considerably.     See compileall.py for a script/module that uses this module to    byte-compile all installed files (or all files in selected    directories).     Do note that FileExistsError is raised if cfile ends up pointing at a    non-regular file or symlink. Because the compilation uses a file renaming,    the resulting file would be regular and thus not the same type of file as    it was previously.    """    if invalidation_mode is None:        invalidation_mode = _get_default_invalidation_mode()    if cfile is None:        if optimize >= 0:            optimization = optimize if optimize >= 1 else ''            cfile = importlib.util.cache_from_source(file,                                                     optimization=optimization)        else:            cfile = importlib.util.cache_from_source(file)    if os.path.islink(cfile):        msg = ('{} is a symlink and will be changed into a regular file if '               'import writes a byte-compiled file to it')        raise FileExistsError(msg.format(cfile))    elif os.path.exists(cfile) and not os.path.isfile(cfile):        msg = ('{} is a non-regular file and will be changed into a regular '               'one if import writes a byte-compiled file to it')        raise FileExistsError(msg.format(cfile))    loader = importlib.machinery.SourceFileLoader('<py_compile>', file)    source_bytes = loader.get_data(file)    try:        code = loader.source_to_code(source_bytes, dfile or file,                                     _optimize=optimize)    except Exception as err:        py_exc = PyCompileError(err.__class__, err, dfile or file)        if quiet < 2:            if doraise:                raise py_exc            else:                sys.stderr.write(py_exc.msg + '\n')        return    try:        dirname = os.path.dirname(cfile)        if dirname:            os.makedirs(dirname)    except FileExistsError:        pass    if invalidation_mode == PycInvalidationMode.TIMESTAMP:        source_stats = loader.path_stats(file)        bytecode = importlib._bootstrap_external._code_to_timestamp_pyc(            code, source_stats['mtime'], source_stats['size'])    else:        source_hash = importlib.util.source_hash(source_bytes)        bytecode = importlib._bootstrap_external._code_to_hash_pyc(            code,            source_hash,            (invalidation_mode == PycInvalidationMode.CHECKED_HASH),        )    mode = importlib._bootstrap_external._calc_mode(file)    importlib._bootstrap_external._write_atomic(cfile, bytecode, mode)    return cfile  def main(args=None):    """Compile several source files.     The files named in 'args' (or on the command line, if 'args' is    not specified) are compiled and the resulting bytecode is cached    in the normal manner.  This function does not search a directory    structure to locate source files; it only compiles files named    explicitly.  If '-' is the only parameter in args, the list of    files is taken from standard input.     """    if args is None:        args = sys.argv[1:]    rv = 0    if args == ['-']:        while True:            filename = sys.stdin.readline()            if not filename:                break            filename = filename.rstrip('\n')            try:                compile(filename, doraise=True)            except PyCompileError as error:                rv = 1                sys.stderr.write("%s\n" % error.msg)            except OSError as error:                rv = 1                sys.stderr.write("%s\n" % error)    else:        for filename in args:            try:                compile(filename, doraise=True)            except PyCompileError as error:                # return value to indicate at least one failure                rv = 1                sys.stderr.write("%s\n" % error.msg)    return rv if __name__ == "__main__":    sys.exit(main())