Fix grammar by adding new tokens to support not triple arguments add new checks #57
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According to the IEEE Standard for Standard Delay Format (SDF) 1497-2001, there are many instances in the grammar where a single float or a float enclosed in parentheses can be used instead of a float triple. I have extended the grammar to include these options.
I have also added timing checks for
PERIOD
,SKEW
, andBIDIRECTSKEW
.