utils.rkt: Add GeneralPair and copy unstringify-pairs.

scribblings/utils.scrbl

@@ -2,7 +2,8 @@
 @(require scribble/example racket/sandbox
 	  (for-label racket graph "../utils.rkt"
 	  	     (only-in typed/racket/base
-		     	      Any AnyValues Listof String Sexp Number
+		     	      Any AnyValues Listof String Sexp Number Pair
+			      List
 			      cast)))
 
 @title[#:tag "utils"]{dds/utils: Various Utilities}
@@ -181,6 +182,22 @@ Reads a @racket[sexp] from a string produced by Org-mode for a named table.
 (unorg "(#t \"#t\" \"#t \" '(1 2 \"#f\"))")
 ]}
 
+@defform[(GeneralPair A B)]{
+
+A @racket[(Pair A B)] or a @racket[(List A B)].
+
+}
+
+@defproc[(unstringify-pairs [pairs (Listof (GeneralPair String Any))])
+         (Listof (GeneralPair Symbol Any))]{
+
+Given a list of pairs of strings and some other values (possibly strings),
+converts the first element of each pair to a string, and reads the second
+element with @racket[string->any] or keeps it as is if it is not a string.
+
+@examples[#:eval utils-evaluator
+(unstringify-pairs '(("a" . 1) ("b" . "(and a (not b))")))
+]}
 
 @section{Additional graph utilities}
 

utils-untyped.rkt

@@ -10,9 +10,7 @@
 
 (provide
  ;; Functions
- (contract-out [unstringify-pairs (-> (listof (general-pair/c string? any/c))
+ (contract-out [read-org-variable-mapping (-> string? variable-mapping?)]
-                                      (listof (general-pair/c symbol? any/c)))]
-               [read-org-variable-mapping (-> string? variable-mapping?)]
                [unorgv (-> string? variable-mapping?)]
                [dotit (-> graph? void?)]
                [read-symbol-list (-> string? (listof symbol?))]

utils.rkt

@@ -2,11 +2,11 @@
 
 (require (for-syntax syntax/parse racket/list))
 
-(provide Variable VariableMapping
+(provide Variable VariableMapping GeneralPair
          eval-with eval1-with
          extract-symbols
          any->string stringify-variable-mapping string->any map-sexp
-         read-org-sexp unorg
+         read-org-sexp unorg unstringify-pairs
          ;; Syntax
          auto-hash-ref/explicit auto-hash-ref/:)
 
@@ -201,3 +201,26 @@
                   '((a (and a b)) (b (or b (not a)))))
     (check-equal? (unorg "(#t \"#t\" \"#t \" '(1 2 \"#f\"))")
                   '(#t #t #t '(1 2 #f)))))
+
+(define-type (GeneralPair A B) (U (Pair A B) (List A B)))
+
+(: unstringify-pairs (-> (Listof (GeneralPair String Any))
+                         (Listof (GeneralPair Symbol Any))))
+(define (unstringify-pairs pairs)
+  (for/list ([p pairs])
+    (match p
+      [(list key val)
+       (cons (string->symbol key) (if (string? val)
+                                      (string->any val)
+                                      val))]
+      [(cons key val)
+       (cons (string->symbol key) (if (string? val)
+                                      (string->any val)
+                                      val))])))
+
+(module+ test
+  (test-case "unstringify-pairs"
+    (check-equal? (unstringify-pairs '(("a" . "1") ("b" . "(and a (not b))")))
+                  '((a . 1) (b . (and a (not b)))))
+    (check-equal? (unstringify-pairs '(("a" . 1) ("b" . "(and a (not b))")))
+                  '((a . 1) (b . (and a (not b)))))))