utils: Add read-symbol-list.

scribblings/utils.scrbl

@@ -214,6 +214,14 @@ Typeset the graph via graphviz and display it.
 
 }
 
+@defproc[(read-symbol-list (str String)) (Listof Symbol)]{
+
+Reads a list of symbols from a string.
+
+@examples[#:eval utils-evaluator
+(read-symbol-list "a b c")
+]}
+
 @section{Additional graph utilities}
 
 @section{Pretty printing}

utils-untyped.rkt

@@ -10,8 +10,7 @@
 
 (provide
  ;; Functions
- (contract-out [read-symbol-list (-> string? (listof symbol?))]
+ (contract-out [drop-first-last (-> string? string?)]
-               [drop-first-last (-> string? string?)]
                [list-sets->list-strings (-> (listof (set/c any/c)) (listof string?))]
                [pretty-print-set-sets (-> (set/c (set/c symbol?) #:kind 'dont-care) string?)]
                [update-vertices/unweighted (-> graph? (-> any/c any/c) graph?)]

utils.rkt

@@ -9,7 +9,7 @@
          extract-symbols
          any->string stringify-variable-mapping string->any map-sexp
          read-org-sexp unorg unstringify-pairs
-         read-org-variable-mapping unorgv
+         read-org-variable-mapping unorgv read-symbol-list
          ;; Syntax
          auto-hash-ref/explicit auto-hash-ref/:)
 
@@ -254,3 +254,11 @@
 
 (: dotit (-> Graph Void))
 (define dotit (compose display graphviz))
+
+(: read-symbol-list (-> String (Listof Symbol)))
+(define (read-symbol-list str)
+  (cast (string->any (string-append "(" str ")")) (Listof Symbol)))
+
+(module+ test
+  (test-case "read-symbol-list"
+    (check-equal? (read-symbol-list "a b c") '(a b c))))