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112 lines
3.8 KiB
Python
112 lines
3.8 KiB
Python
""":mod:`wand.exceptions` --- Errors and warnings
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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This module maps MagickWand API's errors and warnings to Python's native
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exceptions and warnings. You can catch all MagickWand errors using Python's
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natural way to catch errors.
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.. seealso::
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`ImageMagick Exceptions <http://www.imagemagick.org/script/exception.php>`_
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.. versionadded:: 0.1.1
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"""
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class WandException(Exception):
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"""All Wand-related exceptions are derived from this class."""
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class WandWarning(WandException, Warning):
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"""Base class for Wand-related warnings."""
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class WandError(WandException):
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"""Base class for Wand-related errors."""
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class WandFatalError(WandException):
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"""Base class for Wand-related fatal errors."""
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class WandLibraryVersionError(WandException):
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"""Base class for Wand-related ImageMagick version errors.
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.. versionadded:: 0.3.2
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"""
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#: (:class:`list`) A list of error/warning domains, these descriptions and
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#: codes. The form of elements is like: (domain name, description, codes).
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DOMAIN_MAP = [
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('ResourceLimit',
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'A program resource is exhausted e.g. not enough memory.',
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(MemoryError,),
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[300, 400, 700]),
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('Type', 'A font is unavailable; a substitution may have occurred.', (),
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[305, 405, 705]),
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('Option', 'A command-line option was malformed.', (), [310, 410, 710]),
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('Delegate', 'An ImageMagick delegate failed to complete.', (),
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[315, 415, 715]),
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('MissingDelegate',
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'The image type can not be read or written because the appropriate; '
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'delegate is missing.',
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(ImportError,),
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[320, 420, 720]),
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('CorruptImage', 'The image file may be corrupt.',
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(ValueError,), [325, 425, 725]),
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('FileOpen', 'The image file could not be opened for reading or writing.',
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(IOError,), [330, 430, 730]),
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('Blob', 'A binary large object could not be allocated, read, or written.',
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(IOError,), [335, 435, 735]),
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('Stream', 'There was a problem reading or writing from a stream.',
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(IOError,), [340, 440, 740]),
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('Cache', 'Pixels could not be read or written to the pixel cache.',
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(), [345, 445, 745]),
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('Coder', 'There was a problem with an image coder.', (), [350, 450, 750]),
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('Module', 'There was a problem with an image module.', (),
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[355, 455, 755]),
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('Draw', 'A drawing operation failed.', (), [360, 460, 760]),
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('Image', 'The operation could not complete due to an incompatible image.',
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(), [365, 465, 765]),
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('Wand', 'There was a problem specific to the MagickWand API.', (),
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[370, 470, 770]),
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('Random', 'There is a problem generating a true or pseudo-random number.',
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(), [375, 475, 775]),
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('XServer', 'An X resource is unavailable.', (), [380, 480, 780]),
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('Monitor', 'There was a problem activating the progress monitor.', (),
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[385, 485, 785]),
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('Registry', 'There was a problem getting or setting the registry.', (),
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[390, 490, 790]),
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('Configure', 'There was a problem getting a configuration file.', (),
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[395, 495, 795]),
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('Policy',
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'A policy denies access to a delegate, coder, filter, path, or resource.',
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(), [399, 499, 799])
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]
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#: (:class:`list`) The list of (base_class, suffix) pairs (for each code).
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#: It would be zipped with :const:`DOMAIN_MAP` pairs' last element.
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CODE_MAP = [
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(WandWarning, 'Warning'),
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(WandError, 'Error'),
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(WandFatalError, 'FatalError')
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]
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#: (:class:`dict`) The dictionary of (code, exc_type).
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TYPE_MAP = {}
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for domain, description, bases, codes in DOMAIN_MAP:
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for code, (base, suffix) in zip(codes, CODE_MAP):
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name = domain + suffix
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locals()[name] = TYPE_MAP[code] = type(name, (base,) + bases, {
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'__doc__': description,
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'wand_error_code': code
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})
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del name, base, suffix
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