Allow repeating the command between parameters #10
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Drawing strings like 'b 0 0 100 200 300 400' internally translate to something like 'b 0 0 b 100 200 b 300 400' on both libass and xy-VSFilter, so the latter string will have the same effect. This commit skips repetitions of the currently active drawing commands in parameters.
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Originally part of #9, but made a separate PR because it changes parsing logic.
Drawing strings like
b 0 0 100 200 300 400internally translate to something likeb 0 0 b 100 200 b 300 400on both libass and xy-VSFilter, so the latter string will have the same effect. But upon encounteringb 0 0 b 100 200 300 400, ASSFoundation will error out with a message like "incorrect number of ordinates for command 'b': expected 6, got 2".This commit skips repetitions of the currently active drawing commands in parameters. The code only triggers after encountering parameters to commands that wouldn't cast to numbers, so it shouldn't change parsing for drawing strings that assf previously considered valid. Still, it can change behavior when encountering "invalid" drawings.