[Swift] Remove Recognizer.tokenTypeMapCache and .ruleIndexMapCache. #2122
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Remove Recognizer.tokenTypeMapCache and .ruleIndexMapCache. These were easily replaced in Swift with lazy vars. The input to these two caches are fixed fields on the Recognizer (the Vocabulary and rule names respectively) so a lazy var suffices. Note that these differed compared with the Java runtime -- they are declared as static in Java and therefore the caches are shared across all recognizer instances, but the Swift runtime had them as Recognizer instance variables, which meant that at most we had a cache with one entry which got destroyed along with the parser. Regardless, using lazy vars is still simpler. This removes the only usage of ArrayWrapper in the Swift runtime, so delete that too.
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Remove Recognizer.tokenTypeMapCache and .ruleIndexMapCache. These
were easily replaced in Swift with lazy vars. The input to these
two caches are fixed fields on the Recognizer (the Vocabulary and
rule names respectively) so a lazy var suffices.
Note that these differed compared with the Java runtime -- they are
declared as static in Java and therefore the caches are shared across
all recognizer instances, but the Swift runtime had them as Recognizer
instance variables, which meant that at most we had a cache with one
entry which got destroyed along with the parser. Regardless, using
lazy vars is still simpler.
This removes the only usage of ArrayWrapper in the Swift runtime, so
delete that too.