RefactoringGenerator emits the new method (promoted signature, parameter
names = source symbol names) plus the rewritten call site for every
em 02/03 bucket shape (return slot declared inside/outside, tuple
deconstruction, ref write-back, return-call when the selection ends a
non-void method) and refuses loudly where v1 cannot be sound (composite
trailing return, return not ending the method).
The transformed tree must compile with zero diagnostics (the yak's
round-trip check, enforced in both the CLI and the tests).
Findings that shaped the implementation, all enforced by tests:
- NormalizeWhitespace on the WHOLE root corrupts doc-comment trivia so
Roslyn's XML-doc writer fails with CS1569 ('count (-3) must be
non-negative') — and it would reformat the entire file, killing the
diff. Only generated nodes are normalized; original trivia is kept and
indentation/end-of-line is grafted onto the inserted statements/method.
- ParseTypeName("void") yields a node rejected as a method return type
(CS1547) — a void signature must be PredefinedType(Token(VoidKeyword)).
- NormalizeWhitespace drops the space after the contextual keyword 'var'
before '(' — the parsed 'var (x, y) = ...' deconstruction skeleton is
used verbatim; builder-made statements are normalized.
- The new method is normalized inside a throwaway class wrapper: the
normalizer computes indentation from nesting depth, and a bare method
has none.
v1 decision: print a unified-diff PREVIEW to stdout (hand-rolled LCS
unified diff), never an in-place rewrite. Also fixes the hunk header
off-by-one from the phantom trailing empty line of Split('\n').
mostalive
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