glifLib

glifLib.py – Generic module for reading and writing the .glif format.

More info about the .glif format (GLyphInterchangeFormat) can be found here:

The main class in this module is GlyphSet. It manages a set of .glif files in a folder. It offers two ways to read glyph data, and one way to write glyph data. See the class doc string for details.

exception fontTools.ufoLib.glifLib.GlifLibError[source]
args
with_traceback()

Exception.with_traceback(tb) – set self.__traceback__ to tb and return self.

class fontTools.ufoLib.glifLib.GlyphSet(path, glyphNameToFileNameFunc=None, ufoFormatVersion=None, validateRead=True, validateWrite=True, expectContentsFile=False)[source]

GlyphSet manages a set of .glif files inside one directory.

GlyphSet’s constructor takes a path to an existing directory as it’s first argument. Reading glyph data can either be done through the readGlyph() method, or by using GlyphSet’s dictionary interface, where the keys are glyph names and the values are (very) simple glyph objects.

To write a glyph to the glyph set, you use the writeGlyph() method. The simple glyph objects returned through the dict interface do not support writing, they are just a convenient way to get at the glyph data.

close()[source]
deleteGlyph(glyphName)[source]

Permanently delete the glyph from the glyph set on disk. Will raise KeyError if the glyph is not present in the glyph set.

getComponentReferences(glyphNames=None)[source]

Return a dictionary that maps glyph names to lists containing the base glyph name of components in the glyph. This parses the .glif files partially, so it is a lot faster than parsing all files completely. By default this checks all glyphs, but a subset can be passed with glyphNames.

getFileModificationTime(path)

Returns the modification time for the file at the given path, as a floating point number giving the number of seconds since the epoch. The path must be relative to the UFO path. Returns None if the file does not exist.

getGLIF(glyphName)[source]

Get the raw GLIF text for a given glyph name. This only works for GLIF files that are already on disk.

This method is useful in situations when the raw XML needs to be read from a glyph set for a particular glyph before fully parsing it into an object structure via the readGlyph method.

Raises KeyError if ‘glyphName’ is not in contents.plist, or GlifLibError if the file associated with can’t be found.

getGLIFModificationTime(glyphName)[source]

Returns the modification time for the GLIF file with ‘glyphName’, as a floating point number giving the number of seconds since the epoch. Return None if the associated file does not exist or the underlying filesystem does not support getting modified times. Raises KeyError if the glyphName is not in contents.plist.

getImageReferences(glyphNames=None)[source]

Return a dictionary that maps glyph names to the file name of the image referenced by the glyph. This parses the .glif files partially, so it is a lot faster than parsing all files completely. By default this checks all glyphs, but a subset can be passed with glyphNames.

getReverseContents()[source]

Return a reversed dict of self.contents, mapping file names to glyph names. This is primarily an aid for custom glyph name to file name schemes that want to make sure they don’t generate duplicate file names. The file names are converted to lowercase so we can reliably check for duplicates that only differ in case, which is important for case-insensitive file systems.

getUnicodes(glyphNames=None)[source]

Return a dictionary that maps glyph names to lists containing the unicode value[s] for that glyph, if any. This parses the .glif files partially, so it is a lot faster than parsing all files completely. By default this checks all glyphs, but a subset can be passed with glyphNames.

glyphClass

alias of Glyph

has_key(glyphName)[source]
keys()[source]
readGlyph(glyphName, glyphObject=None, pointPen=None, validate=None)[source]

Read a .glif file for ‘glyphName’ from the glyph set. The ‘glyphObject’ argument can be any kind of object (even None); the readGlyph() method will attempt to set the following attributes on it:

“width” the advance width of the glyph “height” the advance height of the glyph “unicodes” a list of unicode values for this glyph “note” a string “lib” a dictionary containing custom data “image” a dictionary containing image data “guidelines” a list of guideline data dictionaries “anchors” a list of anchor data dictionaries

All attributes are optional, in two ways:
  1. An attribute won’t be set if the .glif file doesn’t contain data for it. ‘glyphObject’ will have to deal with default values itself.

  2. If setting the attribute fails with an AttributeError (for example if the ‘glyphObject’ attribute is read- only), readGlyph() will not propagate that exception, but ignore that attribute.

To retrieve outline information, you need to pass an object conforming to the PointPen protocol as the ‘pointPen’ argument. This argument may be None if you don’t need the outline data.

readGlyph() will raise KeyError if the glyph is not present in the glyph set.

validate will validate the data, by default it is set to the class’s validateRead value, can be overridden.

readLayerInfo(info, validateRead=None)[source]

validateRead will validate the data, by default it is set to the class’s validateRead value, can be overridden.

rebuildContents(validateRead=None)[source]

Rebuild the contents dict by loading contents.plist.

validateRead will validate the data, by default it is set to the class’s validateRead value, can be overridden.

writeContents()[source]

Write the contents.plist file out to disk. Call this method when you’re done writing glyphs.

writeGlyph(glyphName, glyphObject=None, drawPointsFunc=None, formatVersion=None, validate=None)[source]

Write a .glif file for ‘glyphName’ to the glyph set. The ‘glyphObject’ argument can be any kind of object (even None); the writeGlyph() method will attempt to get the following attributes from it:

“width” the advance with of the glyph “height” the advance height of the glyph “unicodes” a list of unicode values for this glyph “note” a string “lib” a dictionary containing custom data “image” a dictionary containing image data “guidelines” a list of guideline data dictionaries “anchors” a list of anchor data dictionaries

All attributes are optional: if ‘glyphObject’ doesn’t have the attribute, it will simply be skipped.

To write outline data to the .glif file, writeGlyph() needs a function (any callable object actually) that will take one argument: an object that conforms to the PointPen protocol. The function will be called by writeGlyph(); it has to call the proper PointPen methods to transfer the outline to the .glif file.

The GLIF format version will be chosen based on the ufoFormatVersion passed during the creation of this object. If a particular format version is desired, it can be passed with the formatVersion argument. The formatVersion argument accepts either a tuple of integers for (major, minor), or a single integer for the major digit only (with minor digit implied as 0).

An UnsupportedGLIFFormat exception is raised if the requested GLIF formatVersion is not supported.

validate will validate the data, by default it is set to the class’s validateWrite value, can be overridden.

writeLayerInfo(info, validateWrite=None)[source]

validateWrite will validate the data, by default it is set to the class’s validateWrite value, can be overridden.

fontTools.ufoLib.glifLib.glyphNameToFileName(glyphName, existingFileNames)[source]

Wrapper around the userNameToFileName function in filenames.py

fontTools.ufoLib.glifLib.readGlyphFromString(aString, glyphObject=None, pointPen=None, formatVersions=None, validate=True)[source]

Read .glif data from a string into a glyph object.

The ‘glyphObject’ argument can be any kind of object (even None); the readGlyphFromString() method will attempt to set the following attributes on it:

“width” the advance with of the glyph “height” the advance height of the glyph “unicodes” a list of unicode values for this glyph “note” a string “lib” a dictionary containing custom data “image” a dictionary containing image data “guidelines” a list of guideline data dictionaries “anchors” a list of anchor data dictionaries

All attributes are optional, in two ways:
  1. An attribute won’t be set if the .glif file doesn’t contain data for it. ‘glyphObject’ will have to deal with default values itself.

  2. If setting the attribute fails with an AttributeError (for example if the ‘glyphObject’ attribute is read- only), readGlyphFromString() will not propagate that exception, but ignore that attribute.

To retrieve outline information, you need to pass an object conforming to the PointPen protocol as the ‘pointPen’ argument. This argument may be None if you don’t need the outline data.

The formatVersions optional argument define the GLIF format versions that are allowed to be read. The type is Optional[Iterable[Tuple[int, int], int]]. It can contain either integers (for the major versions to be allowed, with minor digits defaulting to 0), or tuples of integers to specify both (major, minor) versions. By default when formatVersions is None all the GLIF format versions currently defined are allowed to be read.

validate will validate the read data. It is set to True by default.

fontTools.ufoLib.glifLib.writeGlyphToString(glyphName, glyphObject=None, drawPointsFunc=None, formatVersion=None, validate=True)[source]

Return .glif data for a glyph as a string. The XML declaration’s encoding is always set to “UTF-8”. The ‘glyphObject’ argument can be any kind of object (even None); the writeGlyphToString() method will attempt to get the following attributes from it:

“width” the advance width of the glyph “height” the advance height of the glyph “unicodes” a list of unicode values for this glyph “note” a string “lib” a dictionary containing custom data “image” a dictionary containing image data “guidelines” a list of guideline data dictionaries “anchors” a list of anchor data dictionaries

All attributes are optional: if ‘glyphObject’ doesn’t have the attribute, it will simply be skipped.

To write outline data to the .glif file, writeGlyphToString() needs a function (any callable object actually) that will take one argument: an object that conforms to the PointPen protocol. The function will be called by writeGlyphToString(); it has to call the proper PointPen methods to transfer the outline to the .glif file.

The GLIF format version can be specified with the formatVersion argument. This accepts either a tuple of integers for (major, minor), or a single integer for the major digit only (with minor digit implied as 0). By default when formatVesion is None the latest GLIF format version will be used; currently it’s 2.0, which is equivalent to formatVersion=(2, 0).

An UnsupportedGLIFFormat exception is raised if the requested UFO formatVersion is not supported.

validate will validate the written data. It is set to True by default.