212 lines
7.8 KiB
Python
212 lines
7.8 KiB
Python
"""Routine to "compile" a .py file to a .pyc file.
|
|
|
|
This module has intimate knowledge of the format of .pyc files.
|
|
"""
|
|
|
|
import enum
|
|
import importlib._bootstrap_external
|
|
import importlib.machinery
|
|
import importlib.util
|
|
import os
|
|
import os.path
|
|
import sys
|
|
import 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'):
|
|
return PycInvalidationMode.CHECKED_HASH
|
|
else:
|
|
return PycInvalidationMode.TIMESTAMP
|
|
|
|
|
|
def compile(file, cfile=None, dfile=None, doraise=False, optimize=-1,
|
|
invalidation_mode=None):
|
|
"""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:
|
|
|
|
: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 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())
|