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Fixes #1959
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Original file line number | Diff line number | Diff line change |
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class Visitor(object): | ||
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defaultStop = False | ||
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@classmethod | ||
def register(celf, clazzes, attrs=(None,)): | ||
assert celf != Visitor, 'Subclass Visitor instead.' | ||
if '_visitors' not in celf.__dict__: | ||
celf._visitors = {} | ||
if type(clazzes) != tuple: | ||
clazzes = (clazzes,) | ||
if type(attrs) == str: | ||
attrs = (attrs,) | ||
def wrapper(method): | ||
assert method.__name__ == 'visit' | ||
done = [] | ||
for clazz in clazzes: | ||
if clazz in done: continue # Support multiple names of a clazz | ||
done.append(clazz) | ||
_visitors = celf._visitors.setdefault(clazz, {}) | ||
for attr in attrs: | ||
assert attr not in _visitors, \ | ||
"Oops, class '%s' has visitor function for '%s' defined already." % (clazz.__name__, attr) | ||
_visitors[attr] = method | ||
return None | ||
return wrapper | ||
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@classmethod | ||
def _visitorsFor(celf, thing, _default={}): | ||
typ = type(thing) | ||
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for celf in celf.mro(): | ||
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_visitors = getattr(celf, '_visitors', None) | ||
if _visitors is None: | ||
break; | ||
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m = celf._visitors.get(typ, None) | ||
if m is not None: | ||
return m | ||
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return _default | ||
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def visitObject(self, obj, *args, **kwargs): | ||
keys = sorted(vars(obj).keys()) | ||
_visitors = self._visitorsFor(obj) | ||
defaultVisitor = _visitors.get('*', None) | ||
for key in keys: | ||
value = getattr(obj, key) | ||
visitorFunc = _visitors.get(key, defaultVisitor) | ||
if visitorFunc is not None: | ||
ret = visitorFunc(self, obj, key, value, *args, **kwargs) | ||
if ret == False or (ret is None and self.defaultStop): | ||
continue | ||
self.visitAttr(obj, key, value, *args, **kwargs) | ||
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def visitAttr(self, obj, attr, value, *args, **kwargs): | ||
self.visit(value, *args, **kwargs) | ||
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def visitList(self, obj, *args, **kwargs): | ||
for value in obj: | ||
self.visit(value, *args, **kwargs) | ||
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def visit(self, obj, *args, **kwargs): | ||
visitorFunc = self._visitorsFor(obj).get(None, None) | ||
if visitorFunc is not None: | ||
ret = visitorFunc(self, obj, *args, **kwargs) | ||
if ret == False or (ret is None and self.defaultStop): | ||
return | ||
if hasattr(obj, '__dict__'): | ||
self.visitObject(obj, *args, **kwargs) | ||
elif isinstance(obj, list): | ||
self.visitList(obj, *args, **kwargs) | ||
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class OTVisitor(Visitor): | ||
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def visit(self, obj, *args, **kwargs): | ||
if hasattr(obj, "ensureDecompiled"): | ||
obj.ensureDecompiled(recurse=False) | ||
super().visit(obj, *args, **kwargs) |
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,19 @@ | ||
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class TestVisitor(OTVisitor): | ||
pass | ||
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import fontTools.ttLib.tables.otTables as otTables | ||
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@TestVisitor.register(otTables.Lookup) | ||
def visit(visitor, obj): | ||
print(obj) | ||
return False | ||
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from fontTools.ttLib import TTFont | ||
import sys | ||
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font = TTFont(sys.argv[1]) | ||
gsub = font['GSUB'] | ||
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visitor = TestVisitor() | ||
visitor.visit(gsub) |