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82 lines
3.0 KiB
82 lines
3.0 KiB
"""Routine to "compile" a .py file to a .pyc (or .pyo) 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 imp |
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MAGIC = imp.get_magic() |
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__all__ = ["compile"] |
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def wr_long(f, x): |
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"""Internal; write a 32-bit int to a file in little-endian order.""" |
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f.write(chr( x & 0xff)) |
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f.write(chr((x >> 8) & 0xff)) |
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f.write(chr((x >> 16) & 0xff)) |
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f.write(chr((x >> 24) & 0xff)) |
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def compile(file, cfile=None, dfile=None): |
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"""Byte-compile one Python source file to Python bytecode. |
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Arguments: |
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file: source filename |
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cfile: target filename; defaults to source with 'c' or 'o' appended |
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('c' normally, 'o' in optimizing mode, giving .pyc or .pyo) |
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dfile: purported filename; defaults to source (this is the filename |
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that will show up in error messages) |
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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 (or .pyo) 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/.pyo 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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""" |
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import os, marshal, __builtin__ |
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f = open(file) |
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try: |
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timestamp = long(os.fstat(f.fileno())[8]) |
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except AttributeError: |
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timestamp = long(os.stat(file)[8]) |
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codestring = f.read() |
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# If parsing from a string, line breaks are \n (see parsetok.c:tok_nextc) |
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# Replace will return original string if pattern is not found, so |
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# we don't need to check whether it is found first. |
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codestring = codestring.replace("\r\n","\n") |
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codestring = codestring.replace("\r","\n") |
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f.close() |
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if codestring and codestring[-1] != '\n': |
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codestring = codestring + '\n' |
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try: |
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codeobject = __builtin__.compile(codestring, dfile or file, 'exec') |
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except SyntaxError, detail: |
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import traceback, sys |
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lines = traceback.format_exception_only(SyntaxError, detail) |
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for line in lines: |
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sys.stderr.write(line.replace('File "<string>"', |
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'File "%s"' % (dfile or file))) |
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return |
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if not cfile: |
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cfile = file + (__debug__ and 'c' or 'o') |
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fc = open(cfile, 'wb') |
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fc.write('\0\0\0\0') |
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wr_long(fc, timestamp) |
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marshal.dump(codeobject, fc) |
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fc.flush() |
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fc.seek(0, 0) |
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fc.write(MAGIC) |
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fc.close() |
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if os.name == 'mac': |
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import macfs |
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macfs.FSSpec(cfile).SetCreatorType('Pyth', 'PYC ')
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