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"""Routine to "compile" a .py file to a .pyc (or .pyo) file.
This module has intimate knowledge of the format of .pyc files.
"""
import builtins
import errno
import imp
import marshal
import os
import sys
import tokenize
import traceback
MAGIC = imp.get_magic()
__all__ = ["compile", "main", "PyCompileError"]
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
def wr_long(f, x):
"""Internal; write a 32-bit int to a file in little-endian order."""
f.write(bytes([x & 0xff,
(x >> 8) & 0xff,
(x >> 16) & 0xff,
(x >> 24) & 0xff]))
def compile(file, cfile=None, dfile=None, doraise=False):
"""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 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.
: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 (or .pyo) 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/.pyo 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).
"""
with open(file, "rb") as f:
encoding = tokenize.detect_encoding(f.readline)[0]
with open(file, encoding=encoding) as f:
try:
timestamp = int(os.fstat(f.fileno()).st_mtime)
except AttributeError:
timestamp = int(os.stat(file).st_mtime)
codestring = f.read()
try:
codeobject = builtins.compile(codestring, dfile or file,'exec')
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
if cfile is None:
cfile = imp.cache_from_source(file)
try:
os.makedirs(os.path.dirname(cfile))
except OSError as error:
if error.errno != errno.EEXIST:
raise
with open(cfile, 'wb') as fc:
fc.write(b'\0\0\0\0')
wr_long(fc, timestamp)
marshal.dump(codeobject, fc)
fc.flush()
fc.seek(0, 0)
fc.write(MAGIC)
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 IOError 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(error.msg)
return rv
if __name__ == "__main__":
sys.exit(main())
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