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