Xi Ge d41eedcbf6 SwiftSyntax: Add a read-only syntax visitor. (#13681) ...

Based on the feedbacks from our early adopters, separating syntax tree analysis
with transformation is a common pattern. Thus, we introduce a read-only
syntax tree visitor to help the analysis phase. This visitor never alters the
content of a tree being visited, in contrast to SyntaxRewriter which always does.

2018-01-02 16:52:30 -08:00

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visitor.swift

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