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import logging
__all__ = ["apply_to_buffer"]
def is_forward(rules):
clearly_forward = False
clearly_reverse = False
for r in rules:
if hasattr(r, "reverse") and r.reverse:
clearly_reverse = True
else:
clearly_forward = True
if clearly_forward and clearly_reverse:
logging.getLogger("fontFeatures.shaperLib").warn(
"There were forward and reverse rules in the same routine!"
)
return True
return not clearly_reverse
def apply_to_buffer(self, buf, stage=None, feature=None, namedclasses={}):
buf.set_mask(self.flags, self.markFilteringSet, self.markAttachmentSet)
if feature:
buf.set_feature_mask(feature)
# XXX reverse sub routines must go backwards here
if is_forward(self.rules):
i = 0
while i < len(buf): # (which may change!)
for r in self.rules:
if stage and r.stage != stage:
continue
if r.flags:
buf.set_mask(r.flags, self.markFilteringSet, self.markAttachmentSet)
if r.would_apply_at_position(buf, i, namedclasses=namedclasses):
logging.getLogger("fontFeatures.shaperLib").debug(
"Applying rule at position %i\n" % (i)
)
delta = r._do_apply(buf, i, namedclasses=namedclasses)
buf.update()
if delta:
i = i + delta
break
i = i + 1
else:
i = len(buf)
while i >= 0:
for r in self.rules:
if stage and r.stage != stage:
continue
if r.flags:
buf.set_mask(r.flags, self.markFilteringSet, self.markAttachmentSet)
if r.would_apply_at_position(buf, i, namedclasses=namedclasses):
logging.getLogger("fontFeatures.shaperLib").debug(
"Applying rule at position %i\n" % (i)
)
delta = r._do_apply(buf, i, namedclasses=namedclasses)
buf.update()
break
i = i - 1
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