expand semi support

remix/semi.rkt

@@ -3,15 +3,27 @@
                      syntax/parse))
 
 (define-syntax (#%semi stx)
-  (raise-syntax-error '#%semi "illegal outside of block" stx))
+  (raise-syntax-error '#%semi "illegal outside of top-level, block, or braces" stx))
 
 (begin-for-syntax
+  (define-syntax-class not-semi
+    #:literals (#%semi unquote)
+    (pattern (~and (~not #%semi)
+                   (~not (unquote #%semi)))))
+  (define-splicing-syntax-class semi-piece
+    #:literals (#%semi unquote)
+    #:attributes (it)
+    (pattern (~seq #%semi it))
+    (pattern (~seq sp:not-semi ... #%semi)
+             #:attr it #'(sp ...))
+    (pattern (~seq sp:not-semi ... (~and uqs (unquote #%semi)))
+             #:attr it
+             (with-syntax ([semi-#%braces (datum->syntax #'uqs '#%braces)])
+               #'(semi-#%braces sp ...))))
   (define-splicing-syntax-class semi-seq
-    #:literals (#%semi)
     #:attributes ([semi-form 1] [tail-form 1])
-    (pattern (~seq (~seq (~and semi-piece-form (~not #%semi)) ... #%semi) ...
-                   (~and tail-form (~not #%semi)) ...)
-             #:attr [semi-form 1] (syntax->list #'((semi-piece-form ...) ...)))))
+    (pattern (~seq s:semi-piece ... tail-form:not-semi ...)
+             #:attr [semi-form 1] (syntax->list #'(s.it ...)))))
 
 (provide #%semi
          (for-syntax semi-seq))

remix/stx0.rkt

@@ -36,7 +36,8 @@
        (def x (remix-λ args . body)))]))
 
 (module remix-block racket/base
-  (require (for-syntax racket/base
+  (require remix/semi
+           (for-syntax racket/base
                        racket/generic
                        syntax/parse))
   (define-syntax (def* stx)
@@ -66,7 +67,7 @@
        (syntax/loc stx
          (def*-internal (x (remix-λ args . def-body)) bind-body))]))
 
-  (define-syntax (remix-block stx)
+  (define-syntax (the-remix-block stx)
     (syntax-parse stx
       #:literals (def*)
       [(_ (~and (~not (def* . _)) before) ...
@@ -79,6 +80,12 @@
        (syntax/loc stx
          (let () . body))]))
 
+  (define-syntax (remix-block stx)
+    (syntax-parse stx
+      [(_ s:semi-seq)
+       (syntax/loc stx
+         (the-remix-block s.semi-form ... s.tail-form ...))]))
+
   (define-syntax #%brackets
     (make-rename-transformer #'remix-block))
 
@@ -156,7 +163,8 @@
                (#,op arg1 arg2))
              (syntax->list
               #'(output ...)))])))
-(define-syntax (#%braces stx)
+
+(define-syntax (the-#%braces stx)
   (syntax-parse stx
     [(_ input-tokens ...)
      (shunting-yard:consume-input
@@ -164,6 +172,17 @@
       empty
       empty)]))
 
+(define-syntax (#%braces stx)
+  (syntax-parse stx
+    [(_ s:semi-seq)
+     (syntax-case #'(s.semi-form ...) ()
+       [()
+        (syntax/loc stx
+          (the-#%braces s.tail-form ...))]
+       [(sf ...)
+        (syntax/loc stx
+          (remix-block sf ... (the-#%braces s.tail-form ...)))])]))
+
 (begin-for-syntax
   (define-generics dot-transformer
     (dot-transform dot-transformer stx)))

remix/tests/simple.rkt

@@ -5,6 +5,7 @@
 require remix/stx0
         remix/num/gen0;
 
+;
 (module+ test
   ;; This introduces ≡ as a testing form
 
@@ -14,18 +15,45 @@ require remix/stx0
   (require remix/test0))
 
 ;; define is replaced with def
-(def z 42)
-(module+ test
-  {z ≡ 42})
+def z 42;
+module+ test
+ {z ≡ 42};
 
 ;; when def has more forms than one, they are put inside of a block
-(def x
-  (def a 40)
-  (def b 2)
-  (+ a b))
+def x
+ (def a 40)
+ (def b 2)
+ (+ a b) ;
+;
 (module+ test
   {x ≡ 42})
 
+;; If you would like to use ;-syntax in the inside of def, then you
+;; need more punctuation. You have two choices.
+def x2
+ [def a 40;
+  def b 2;
+  (+ a b)];
+;
+(module+ test
+  {x2 ≡ 42})
+
+def x3
+ {def a 40;
+  def b 2;
+  a + b};
+;
+(module+ test
+  {x3 ≡ 42})
+
+def x4
+ {a := 40,;
+  b := 2,;
+  a + b};
+;
+(module+ test
+  {x4 ≡ 42})
+
 ;; but of course def supports function definitions. [] is NOT the same
 ;; as (), it parses as #%brackets and defaults to expanding to a block
 ;; definition