stxparam cont'd

beautiful-racket-lib/br/#stxparam.rkt#1#

@@ -0,0 +1,241 @@
+#reader(lib"read.ss""wxme")WXME0108 ## 
+#|
+   This file uses the GRacket editor format.
+   Open this file in DrRacket version 6.4.0.15 or later to read it.
+
+   Most likely, it was created by saving a program in DrRacket,
+   and it probably contains a program with non-text elements
+   (such as images or comment boxes).
+
+            http://racket-lang.org/
+|#
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+0           0

beautiful-racket-lib/br/stxparam.rkt

@@ -0,0 +1,34 @@
+#lang racket/base
+(require (for-syntax racket/base syntax/parse) syntax/strip-context)
+(provide (all-defined-out) (all-from-out syntax/strip-context))
+
+
+(define-syntax (syntax-match stx)
+  (syntax-case stx (syntax)
+    [(_ stx-arg [(syntax pattern) body ...] ...)
+     #'(syntax-case stx-arg ()
+         [pattern body ...] ...)]))
+
+(define-syntax (add-syntax stx)
+  ;; todo: permit mixing of two-arg and one-arg binding forms
+  ;; one-arg form allows you to inject an existing syntax object using its current name
+  (syntax-case stx (syntax)
+    [(_ ([(syntax sid) sid-stx] ...) body ...)
+     #'(with-syntax ([sid sid-stx] ...) body ...)]
+    ;; todo: limit `sid` to be an identifier
+    [(_ ([sid] ...) body ...)
+     #'(with-syntax ([sid sid] ...) body ...)]))
+
+(define-syntax syntax-let (make-rename-transformer #'add-syntax))
+
+(define-syntax inject-syntax (make-rename-transformer #'add-syntax))
+
+(define-syntax (map-syntax stx)
+  (syntax-case stx ()
+    [(_ <proc> <arg> ...)
+     #'(map <proc> (if (and (syntax? <arg>) (list? (syntax-e <arg>)))
+                       (syntax->list <arg>)
+                       <arg>) ...)]))
+
+
+#;(define-syntax syntax-variable (make-rename-transformer #'format-id))

beautiful-racket/br/demo/basic/expander.rkt

@@ -5,18 +5,19 @@
          (all-defined-out))
 (require (for-syntax racket/syntax racket/list br/datum))
 
-(require racket/stxparam)
+(require racket/stxparam racket/splicing)
 (define-syntax-parameter A
   (λ (stx) 
-    (raise-syntax-error (syntax-e stx) "can only be used inside the place")))
+    (raise-syntax-error (syntax-e stx) "parameter not set")))
 
 (define #'(basic-module-begin PARSE-TREE ...)
   #'(#%module-begin
-     (let ([A-inner 0])
-       (syntax-parameterize
-           ([A (make-rename-transformer #'A-inner)])
-         (println (quote PARSE-TREE ...))
-         PARSE-TREE ...))))
+     (splicing-syntax-parameterize
+         ([A (make-rename-transformer #'A-var)])
+       (define A-var 0)
+       (provide (rename-out [A-var A]))
+       (println (quote PARSE-TREE ...))
+       PARSE-TREE ...)))
 
 ; #%app and #%datum have to be present to make #%top work
 (define #'(basic-top . id)