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# Copyright 2013 Google, Inc. All Rights Reserved.
#
# Google Author(s): Behdad Esfahbod, Roozbeh Pournader
from fontTools.ttLib.tables.DefaultTable import DefaultTable
import logging
log = logging.getLogger("fontTools.merge")
def add_method(*clazzes, **kwargs):
"""Returns a decorator function that adds a new method to one or
more classes."""
allowDefault = kwargs.get('allowDefaultTable', False)
def wrapper(method):
done = []
for clazz in clazzes:
if clazz in done: continue # Support multiple names of a clazz
done.append(clazz)
assert allowDefault or clazz != DefaultTable, 'Oops, table class not found.'
assert method.__name__ not in clazz.__dict__, \
"Oops, class '%s' has method '%s'." % (clazz.__name__, method.__name__)
setattr(clazz, method.__name__, method)
return None
return wrapper
def mergeObjects(lst):
lst = [item for item in lst if item is not NotImplemented]
if not lst:
return NotImplemented
lst = [item for item in lst if item is not None]
if not lst:
return None
clazz = lst[0].__class__
assert all(type(item) == clazz for item in lst), lst
logic = clazz.mergeMap
returnTable = clazz()
returnDict = {}
allKeys = set.union(set(), *(vars(table).keys() for table in lst))
for key in allKeys:
try:
mergeLogic = logic[key]
except KeyError:
try:
mergeLogic = logic['*']
except KeyError:
raise Exception("Don't know how to merge key %s of class %s" %
(key, clazz.__name__))
if mergeLogic is NotImplemented:
continue
value = mergeLogic(getattr(table, key, NotImplemented) for table in lst)
if value is not NotImplemented:
returnDict[key] = value
returnTable.__dict__ = returnDict
return returnTable
@add_method(DefaultTable, allowDefaultTable=True)
def merge(self, m, tables):
if not hasattr(self, 'mergeMap'):
log.info("Don't know how to merge '%s'.", self.tableTag)
return NotImplemented
logic = self.mergeMap
if isinstance(logic, dict):
return m.mergeObjects(self, self.mergeMap, tables)
else:
return logic(tables)
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