# errors from libvips
import sys
import logging
from pyvips import ffi, vips_lib, glib_lib
logger = logging.getLogger(__name__)
_is_PY3 = sys.version_info[0] == 3
if _is_PY3:
# pathlib is not part of Python 2 stdlib
from pathlib import Path
text_type = str, Path
byte_type = bytes
else:
text_type = unicode
byte_type = str
def _to_bytes(x):
"""Convert to a byte string.
Convert a Python unicode string or a pathlib.Path to a utf-8-encoded
byte string. You must call this on strings you pass to libvips.
"""
if isinstance(x, text_type):
# n.b. str also converts pathlib.Path objects
x = str(x).encode('utf-8')
return x
def _to_string(x):
"""Convert to a unicode string.
If x is a byte string, assume it is utf-8 and decode to a Python unicode
string. You must call this on text strings you get back from libvips.
"""
if x == ffi.NULL:
x = 'NULL'
else:
x = ffi.string(x)
if isinstance(x, byte_type):
x = x.decode('utf-8')
return x
def _to_string_copy(x):
"""Convert to a unicode string, and auto-free.
As _to_string(), but also tag x as a pointer to a memory area that must
be freed with g_free().
"""
return _to_string(ffi.gc(x, glib_lib.g_free))
[docs]class Error(Exception):
"""An error from vips.
Attributes:
message (str): a high-level description of the error
detail (str): a string with some detailed diagnostics
"""
def __init__(self, message, detail=None):
self.message = message
if detail is None or detail == "":
detail = _to_string(vips_lib.vips_error_buffer())
vips_lib.vips_error_clear()
self.detail = detail
logger.debug('Error %s %s', self.message, self.detail)
def __str__(self):
return '{0}\n {1}'.format(self.message, self.detail)
__all__ = [
'_to_bytes', '_to_string', '_to_string_copy', 'Error',
]
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