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Jon Ross-Perkins
446b0ce4ae
This started with cleaning up the remaining Name/expression type punning in the node stack, and grew. I'm factoring out a class because we've previously expressed the desire to factor logic out of SemanticsContext where possible, and this seemed like a reasonable cut. NameExpression as the first node as a QualifiedExpression allows the qualifier handling to consider Name in one less spot, an incremental simplification. However, the additional complexity caused by this makes me split ApplyNameQualifier/ApplyExpressionQualifier in order to avoid repeat checks of the parse node's kind. The logic is still largely shared, thus a couple helper functions. I think this is all fairly well structured in the isolated class. I can see that we may want to avoid passing SemanticsContext as an argument in the future if it elides a step of lookup.