/usr/lib/python3/dist-packages/defcon/objects/imageSet.py is in python3-defcon 0.3.5-1.
This file is owned by root:root, with mode 0o644.
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import os
import hashlib
import weakref
from defcon.objects.base import BaseObject
from fontTools.misc.py23 import unicode
from ufoLib import UFOReader, UFOLibError
from ufoLib.filenames import userNameToFileName, illegalCharacters, reservedFileNames, maxFileNameLength
from ufoLib.validators import pngSignature
class ImageSet(BaseObject):
"""
This object manages all images in the font.
**This object posts the following notifications:**
===========================
Name
===========================
ImageSet.Changed
ImageSet.FileNamesChanged
ImageSet.ImageChanged
ImageSet.ImageWillBeAdded
ImageSet.ImageAdded
ImageSet.ImageWillBeDeleted
ImageSet.ImageDeleted
===========================
This object behaves like a dict. For example, to get the
raw image data for a particular image::
image = images["image file name"]
To add an image, do this::
images["image file name"] = rawImageData
When setting an image, the provided file name must be a file
system legal string. This will be checked by comparing the
provided file name to the results of :py:meth:`ImageSet.makeFileName`.
If the two don't match an error will be raised.
Before setting an image, the :py:meth:`ImageSet.findDuplicateImage`
method should be called. If a file name is retruend, the new image
data should not be added. The UFO spec recommends (but doesn't require)
that duplicate images be avoided. This will help with that.
To remove an image from this object, and from the UFO during save,
do this::
del images["image file name"]
"""
changeNotificationName = "ImageSet.Changed"
representationFactories = {}
def __init__(self, font=None):
self._font = None
if font is not None:
self._font = weakref.ref(font)
super(ImageSet, self).__init__()
self.beginSelfNotificationObservation()
self._data = {}
self._scheduledForDeletion = {}
# --------------
# Parent Objects
# --------------
def getParent(self):
return self.font
def _get_font(self):
if self._font is not None:
return self._font()
return None
font = property(_get_font, doc="The :class:`Font` that this object belongs to.")
# ----------
# File Names
# ----------
def _get_fileNames(self):
return list(self._data.keys())
def _set_fileNames(self, fileNames):
assert not self._data
oldValue = list(self._data.keys())
for fileName in fileNames:
self._data[fileName] = _imageDict(onDisk=True)
self.postNotification("ImageSet.FileNamesChanged", data=dict(oldValue=oldValue, newValue=fileNames))
fileNames = property(_get_fileNames, _set_fileNames, doc="A list of all image file names. This should not be set externally.")
def _get_unreferencedFileNames(self):
font = self.font
if font is None:
return []
unreferenced = set(self.fileNames)
for layer in font.layers:
unreferenced -= set(layer.imageReferences.keys())
return list(unreferenced)
unreferencedFileNames = property(_get_unreferencedFileNames, doc="A list of all file names not referenced by a glyph.")
# -------------
# Dict Behavior
# -------------
def __contains__(self, fileName):
return fileName in self._data
def __getitem__(self, fileName):
d = self._data[fileName]
if d["data"] is None:
path = self.font.path
reader = UFOReader(path)
data = reader.readImage(fileName)
d["data"] = data
d["digest"] = _makeDigest(data)
d["onDisk"] = True
d["onDiskModTime"] = reader.getFileModificationTime(os.path.join("images", fileName))
return d["data"]
def __setitem__(self, fileName, data):
if fileName not in self._data:
test = fileName
if fileName.lower().endswith(".png"):
test = os.path.splitext(fileName)[0]
assert fileNameValidator(test)
assert data.startswith(pngSignature), "Image does not begin with the PNG signature."
isNewImage = fileName not in self._data
onDisk = False
onDiskModTime = None
if fileName in self._scheduledForDeletion:
# preserve exsiting stamping
assert fileName not in self._data
self._data[fileName] = self._scheduledForDeletion.pop(fileName)
digest = _makeDigest(data)
if fileName in self._data:
n = self[fileName] # force it to load so that the stamping is correct
if self._data[fileName]["digest"] == digest:
return
onDisk = self._data[fileName]["onDisk"]
onDiskModTime = self._data[fileName]["onDiskModTime"]
del self._data[fileName] # now remove it
if isNewImage:
self.postNotification("ImageSet.ImageWillBeAdded", data=dict(name=fileName))
self._data[fileName] = _imageDict(data=data, dirty=True, digest=digest, onDisk=onDisk, onDiskModTime=onDiskModTime)
if isNewImage:
self.postNotification("ImageSet.ImageAdded", data=dict(name=fileName))
else:
self.postNotification("ImageSet.ImageChanged", data=dict(name=fileName))
self.dirty = True
def __delitem__(self, fileName):
n = self[fileName] # force it to load so that the stamping is correct
self.postNotification("ImageSet.ImageWillBeDeleted", data=dict(name=fileName))
self._scheduledForDeletion[fileName] = dict(self._data.pop(fileName))
self.postNotification("ImageSet.ImageDeleted", data=dict(name=fileName))
self.dirty = True
# ----
# Save
# ----
def getSaveProgressBarTickCount(self, formatVersion):
"""
Get the number of ticks that will be used by a progress bar
in the save method. This method should not be called externally.
Subclasses may override this method to implement custom saving behavior.
"""
return 0
def save(self, writer, removeUnreferencedImages=False, saveAs=False, progressBar=None):
"""
Save images. This method should not be called externally.
Subclasses may override this method to implement custom saving behavior.
"""
if removeUnreferencedImages:
self.disableNotifications()
for fileName in self.unreferencedFileNames:
del self[fileName]
self.enableNotifications()
if saveAs:
font = self.font
if font is not None and font.path is not None and os.path.exists(font.path):
reader = UFOReader(font.path)
readerImageNames = reader.getImageDirectoryListing()
for fileName, data in self._data.items():
if data["data"] is not None or fileName not in readerImageNames:
continue
writer.copyImageFromReader(reader, fileName, fileName)
for fileName in self._scheduledForDeletion:
try:
writer.removeImage(fileName)
except UFOLibError:
# this will be raised if the file doesn't exist.
# instead of trying to maintain a list of in UFO
# vs. in memory, simply fail and move on when
# something can't be deleted because it isn't
# in the UFO.
pass
self._scheduledForDeletion.clear()
reader = UFOReader(writer.path)
for fileName, data in self._data.items():
if not data["dirty"]:
continue
writer.writeImage(fileName, data["data"])
data["dirty"] = False
data["onDisk"] = True
data["onDiskModTime"] = reader.getFileModificationTime(os.path.join("images", fileName))
self.dirty = False
# ---------------
# File Management
# ---------------
def makeFileName(self, fileName):
"""
Make a file system legal version of **fileName**.
"""
fileName = unicode(fileName)
suffix = ""
if fileName.lower().endswith(".png"):
suffix = fileName[-4:]
fileName = fileName[:-4]
existing = set([i.lower() for i in self.fileNames])
return userNameToFileName(fileName, existing, suffix=suffix)
def findDuplicateImage(self, data):
"""
Search the images to see if an image matching
**image** already exists. If so, the file name
for the existing image will be returned.
"""
digest = _makeDigest(data)
notYetLoaded = []
for fileName, image in self._data.items():
# skip if the image hasn't been loaded
if image["data"] is None:
notYetLoaded.append(fileName)
continue
otherDigest = image["digest"]
if otherDigest == digest:
return fileName
for fileName in notYetLoaded:
d = self[fileName]
image = self._data[fileName]
otherDigest = image["digest"]
if otherDigest == digest:
return fileName
return None
# ---------------------
# External Edit Support
# ---------------------
def testForExternalChanges(self, reader):
"""
Test for external changes. This should not be called externally.
"""
filesOnDisk = reader.getImageDirectoryListing()
modifiedImages = []
addedImages = []
deletedImages = []
for fileName in set(filesOnDisk) - set(self.fileNames):
if fileName not in self._scheduledForDeletion:
addedImages.append(fileName)
elif not self._scheduledForDeletion[fileName]["onDisk"]:
addedImages.append(fileName)
elif self._scheduledForDeletion[fileName]["onDiskModTime"] != reader.getFileModificationTime(os.path.join("images", fileName)):
addedImages.append(fileName)
for fileName, imageData in self._data.items():
# file on disk and has been loaded
if fileName in filesOnDisk and imageData["data"] is not None:
newModTime = reader.getFileModificationTime(os.path.join("images", fileName))
if newModTime != imageData["onDiskModTime"]:
newData = reader.readImage(fileName)
newDigest = _makeDigest(newData)
if newDigest != imageData["digest"]:
modifiedImages.append(fileName)
continue
# file removed
if fileName not in filesOnDisk and imageData["onDisk"]:
deletedImages.append(fileName)
continue
return modifiedImages, addedImages, deletedImages
def reloadImages(self, fileNames):
"""
Reload specified images. This should not be called externally.
"""
for fileName in fileNames:
self._data[fileName] = _imageDict()
image = self[fileName]
# ------------------------
# Notification Observation
# ------------------------
def endSelfNotificationObservation(self):
super(ImageSet, self).endSelfNotificationObservation()
self._font = None
# -----------------------------
# Serialization/Deserialization
# -----------------------------
def getDataForSerialization(self, **kwargs):
simple_get = lambda k: self[k]
getters = []
for k in self.fileNames:
getters.append((k, simple_get))
return self._serialize(getters, **kwargs)
def setDataFromSerialization(self, data):
self._data = {}
self._scheduledForDeletion = {}
for k in data:
self[k] = data[k]
def _imageDict(data=None, dirty=False, digest=None, onDisk=True, onDiskModTime=None):
return dict(data=data, digest=digest, dirty=dirty, onDisk=onDisk, onDiskModTime=onDiskModTime)
def _makeDigest(data):
m = hashlib.md5()
m.update(data)
return m.digest()
def fileNameValidator(value):
"""
>>> fileNameValidator(u'a')
True
>>> fileNameValidator(u'A_')
True
>>> fileNameValidator(u'A_E_')
True
>>> fileNameValidator(u'A_e')
True
>>> fileNameValidator(u'ae')
True
>>> fileNameValidator(u'aE_')
True
>>> fileNameValidator(u'a.alt')
True
>>> fileNameValidator(u'A_.alt')
True
>>> fileNameValidator(u'A_.A_lt')
True
>>> fileNameValidator(u'A_.aL_t')
True
>>> fileNameValidator(u'A_.alT_')
True
>>> fileNameValidator(u'T__H_')
True
>>> fileNameValidator(u'T__h')
True
>>> fileNameValidator(u't_h')
True
>>> fileNameValidator(u'F__F__I_')
True
>>> fileNameValidator(u'f_f_i')
True
>>> fileNameValidator(u'A_acute_V_.swash')
True
>>> fileNameValidator(u'_notdef')
True
>>> fileNameValidator(u'_con')
True
>>> fileNameValidator(u'C_O_N_')
True
>>> fileNameValidator(u'_con.alt')
True
>>> fileNameValidator(u'alt._con')
True
>>> fileNameValidator('A')
False
>>> fileNameValidator(u'A'*256)
False
>>> fileNameValidator(u'A')
False
>>> fileNameValidator(u'con')
False
>>> fileNameValidator(u'a/alt')
False
>>> fileNameValidator(u"A_bC_dE_f")
True
"""
# must be a unicode
if not isinstance(value, unicode):
return False
# must not be longer then the max fileName length
if len(value) > maxFileNameLength:
return False
for i, character in enumerate(value):
# must not contain any illegal characters
if character in illegalCharacters:
return False
# its a capital and it should be followed by an _ (underscore)
elif character != character.lower():
if i == len(value)-1:
return False
if value[i+1] != "_":
return False
# check reserved file names
for reservedFileName in reservedFileNames:
# all reserved file names are being prefix with an _ (underscore)
# if the replaced value is the same there is no correct prefix
if reservedFileName in value:
if value == value.replace("_%s" % reservedFileName, ""):
return False
return True
if __name__ == "__main__":
import doctest
doctest.testmod()
|