squash! mescc: Fix switch statements' fallthrough --support mes
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@ -1791,29 +1791,33 @@
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(set! i (1+ i)))
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n))))
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(define (flatten-cases c)
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(define (flatten-case case)
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(pmatch case
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((case ,test (case . ,body))
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(append `((case ,test (expr-stmt))) (flatten-case `(case ,@body))))
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((case ,test ,casebody (case . ,body))
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(append `((case ,test ,casebody)) (flatten-case `(case ,@body))))
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((default (case . ,body))
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(append `((default (expr-stmt))) (flatten-case `(case ,@body))))
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((default ,defbody (case . ,body))
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(append `((default ,defbody)) (flatten-case `(case ,@body))))
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((case ,test (default . ,body))
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(append `((case ,test (expr-stmt))) (flatten-case `(default ,@body))))
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((default ,rest)
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(list case))
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((case ,test)
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(list case))
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((case ,test ,expr)
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(list case))
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(,s (list s))))
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(fold (lambda (x acc) (append acc (flatten-case x))) '() c))
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(define (flatten-cases cases)
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(define (flatten-case o cases)
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(let ((c (pmatch o
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((case ,test (case . ,body))
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(append `((case ,test (expr-stmt)))
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(flatten-case `(case ,@body))))
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((case ,test ,case-body (case . ,body))
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(append `((case ,test ,case-body))
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(flatten-case `(case ,@body))))
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((default (case . ,body))
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(append `((default (expr-stmt)))
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(flatten-case `(case ,@body))))
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((default ,default-body (case . ,body))
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(append `((default ,default-body))
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(flatten-case `(case ,@body))))
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((case ,test (default . ,body))
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(append `((case ,test (expr-stmt)))
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(flatten-case `(default ,@body))))
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((default ,rest)
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(list o))
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((case ,test)
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(list o))
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((case ,test ,expr)
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(list o))
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(,s (list s)))))
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(append c cases)))
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(fold flatten-case '() cases))
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(let* ((info (append-text info (ast->comment `(switch ,expr (compd-stmt (block-item-list (ellipsis)))))))
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(statements (flatten-cases statements))
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