diff options
Diffstat (limited to 'mwexpand.scm')
| -rw-r--r-- | mwexpand.scm | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/mwexpand.scm b/mwexpand.scm index 10083a3..a53f0da 100644 --- a/mwexpand.scm +++ b/mwexpand.scm @@ -146,6 +146,8 @@ ((eq? keyword mw:denote-of-let-syntax) (mw:let-syntax exp env)) ((eq? keyword mw:denote-of-letrec-syntax) (mw:letrec-syntax exp env)) + ; @@ case has a nontrivial syntax also -- wdc + ((eq? keyword mw:denote-of-case) (mw:case exp env)) ; @@ let, let*, letrec, paint within quasiquotation -- kend ((eq? keyword mw:denote-of-let) (mw:let exp env)) ((eq? keyword mw:denote-of-let*) (mw:let* exp env)) @@ -394,6 +396,21 @@ exp) ) +; CASE -- added by wdc +(define (mw:case exp env) + (let ((expand (lambda (exp) + (mw:expand exp env)))) + (if (< (mw:safe-length exp) 3) + (mw:error "Malformed case expression" exp env) + `(case ,(expand (cadr exp)) + ,@(map (lambda (clause) + (if (< (mw:safe-length exp) 2) + (mw:error "Malformed case clause" exp env) + (cons (mw:strip (car clause)) + (map expand (cdr clause))))) + (cddr exp)))))) + + ; LET (define (mw:let exp env) (let* ( (name (if (or (pair? (cadr exp)) (null? (cadr exp))) |