70 lines
2.0 KiB
Python
70 lines
2.0 KiB
Python
"""
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Merge OpenType Layout tables (GDEF / GPOS / GSUB).
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"""
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from __future__ import print_function, division, absolute_import
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from fontTools.misc.py23 import *
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from fontTools.ttLib.tables import otTables as ot
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from fontTools.ttLib.tables.DefaultTable import DefaultTable
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class Merger(object):
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mergers = None
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@classmethod
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def merger(celf, *clazzes):
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assert celf != Merger, 'Subclass Merger instead.'
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if celf.mergers is None:
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celf.mergers = {}
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def wrapper(method):
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assert method.__name__ == 'merge'
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done = []
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for clazz in clazzes:
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if clazz in done: continue # Support multiple names of a clazz
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done.append(clazz)
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assert clazz not in celf.mergers, \
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"Oops, class '%s' has merge function defined already." % (clazz.__name__)
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celf.mergers[clazz] = method
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return None
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return wrapper
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def mergeObjects(self, out, lst):
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keys = vars(out).keys()
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assert all(vars(table).keys() == keys for table in lst)
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try:
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for key in keys:
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value = getattr(out, key)
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values = [getattr(table, key) for table in lst]
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self.mergeThings(value, values)
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except Exception as e:
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e.args = e.args + ('.'+key,)
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raise
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def mergeLists(self, out, lst):
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count = len(out)
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assert all(count == len(v) for v in lst), (count, [len(v) for v in lst])
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for value,values in zip(out, zip(*lst)):
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self.mergeThings(value, values)
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def mergeThings(self, out, lst):
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clazz = type(out)
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try:
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assert all(type(item) == clazz for item in lst), lst
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mergerFunc = self.mergers.get(type(out), None)
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if mergerFunc is not None:
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mergerFunc(self, out, lst)
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elif hasattr(out, '__dict__'):
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self.mergeObjects(out, lst)
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elif isinstance(out, list):
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self.mergeLists(out, lst)
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else:
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assert all(out == v for v in lst), lst
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except Exception as e:
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e.args = e.args + (clazz.__name__,)
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raise
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def merge_tables(font, merger, master_ttfs, axes, base_idx, tables):
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for tag in tables:
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print('Merging', tag)
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merger.mergeThings(font[tag], [m[tag] for m in master_ttfs])
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