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33 lines
1.0 KiB
Python
33 lines
1.0 KiB
Python
"""Specialization of fontTools.misc.visitor to work with TTFont."""
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from fontTools.misc.visitor import Visitor
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from fontTools.ttLib import TTFont
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class TTVisitor(Visitor):
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def visitAttr(self, obj, attr, value, *args, **kwargs):
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if isinstance(value, TTFont):
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return False
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super().visitAttr(obj, attr, value, *args, **kwargs)
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def visit(self, obj, *args, **kwargs):
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if hasattr(obj, "ensureDecompiled"):
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obj.ensureDecompiled(recurse=False)
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super().visit(obj, *args, **kwargs)
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@TTVisitor.register(TTFont)
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def visit(visitor, font, *args, **kwargs):
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# Some objects have links back to TTFont; even though we
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# have a check in visitAttr to stop them from recursing
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# onto TTFont, sometimes they still do, for example when
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# someone overrides visitAttr.
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if hasattr(visitor, "font"):
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return False
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visitor.font = font
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for tag in font.keys():
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visitor.visit(font[tag], *args, **kwargs)
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del visitor.font
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return False
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