Typesetting now recognizes carets (^) in the underscore component of a

non-terminal reference, applying the non-terminal-superscript-style to
the text following the caret.

svn: r17801

collects/redex/pict.ss

@@ -59,6 +59,7 @@
  [default-style (parameter/c text-style/c)]
  [non-terminal-style (parameter/c text-style/c)]
  [non-terminal-subscript-style (parameter/c text-style/c)]
+ [non-terminal-superscript-style (parameter/c text-style/c)]
  [linebreaks (parameter/c (or/c false/c (listof boolean?)))]
  [curly-quotes-for-strings (parameter/c boolean?)]
  [white-bracket-sizing (parameter/c

collects/redex/private/bitmap-test.ss

@@ -159,5 +159,9 @@
 ;; make sure two metafunctions simultaneously rewritten line up properly
 (test (render-metafunctions S T TL) "metafunctions-multiple.png")
 
+;; Non-terminal superscripts
+(test (render-lw lang (to-lw (x_^abcdef x_q^abcdef)))
+      "superscripts.png")
+
 (printf "bitmap-test.ss: ")
 (done)

collects/redex/private/core-layout.ss

@@ -7,6 +7,7 @@
          texpict/utils
          texpict/mrpict
         
+         scheme/match
          scheme/gui/base
          scheme/class)
 
@@ -21,6 +22,7 @@
          label-style
          non-terminal-style
          non-terminal-subscript-style
+         non-terminal-superscript-style
          label-font-size
          default-font-size
          metafunction-font-size
@@ -688,18 +690,15 @@
                                                'modern
                                                (default-font-size)))))]
       [(and (symbol? atom)
-            (regexp-match #rx"^([^_]*)_(.*)$" (symbol->string atom)))
+            (regexp-match #rx"^([^_^]*)_([^^]*)\\^?(.*)$" (symbol->string atom)))
        =>
-       (λ (m)
+       (match-lambda
-         (let* ([first-part (cadr m)]
+           [(list _ nt sub sup)
-                [second-part (caddr m)]
+            (let* ([sub-pict (basic-text sub (non-terminal-subscript-style))]
-                [first-span (- span (string-length first-part))])
+                   [sup-pict (basic-text sup (non-terminal-superscript-style))]
-           (list 
+                   [sub+sup (lbl-superimpose sub-pict sup-pict)])
-            (non-terminal->token col first-span first-part)
+              (list (non-terminal->token col span nt)
-            (make-string-token (+ col first-span) 
+                    (make-pict-token (+ col span) 0 sub+sup)))])]
-                               (- span first-span)
-                               second-part
-                               (non-terminal-subscript-style)))))]
       [(or (memq atom all-nts)
            (memq atom '(number variable variable-except variable-not-otherwise-mentioned)))
        (list (non-terminal->token col span (format "~s" atom)))]
@@ -747,6 +746,7 @@
   (define (unksc str) (pink-background ((current-text) str 'modern (default-font-size))))
   (define non-terminal-style (make-parameter '(italic . roman)))
   (define non-terminal-subscript-style (make-parameter `(subscript . ,(non-terminal-style))))
+  (define non-terminal-superscript-style (make-parameter `(superscript . ,(non-terminal-style))))
   (define default-style (make-parameter 'roman))
   (define metafunction-style (make-parameter 'swiss))
   (define (metafunction-text str) ((current-text) str (metafunction-style) (metafunction-font-size)))

collects/redex/redex.scrbl

@@ -1865,6 +1865,7 @@ cases appear. If it is a list of numbers, then only the selected cases appear (c
 @defparam[metafunction-style style text-style/c]{}
 @defparam[non-terminal-style style text-style/c]{}
 @defparam[non-terminal-subscript-style style text-style/c]{}
+@defparam[non-terminal-superscript-style style text-style/c]{}
 @defparam[default-style style text-style/c]{}]]{
 
 These parameters determine the font used for various text in
@@ -1875,15 +1876,27 @@ useful things it can be is one of the symbols @scheme['roman],
 monospaced font, respectively. (It can also encode style
 information, too.)
 
-The label-style is used for the reduction rule label
+The @scheme[label-style] is used for the reduction rule label
-names. The literal-style is used for names that aren't
+names. The @scheme[literal-style] is used for names that aren't
 non-terminals that appear in patterns. The
-metafunction-style is used for the names of
+@scheme[metafunction-style] is used for the names of
-metafunctions. The non-terminal-style is for non-terminals
+metafunctions. 
-and non-terminal-subscript-style is used for the portion
+
+The @scheme[non-terminal-style] is used for the names of non-terminals.
+Two parameters style the text in the (optional) "underscore" component
+of a non-terminal reference. The first, @scheme[non-terminal-subscript-style],
+applies to the segment between the underscore and the first caret (@scheme[^]) 
+to follow it; the second, @scheme[non-terminal-superscript-style], applies
+to the segment following that caret. For example, in the non-terminal 
+reference @scheme[x_y_z], @scheme[x] has style @scheme[non-terminal-style],
+@scheme[y] has style @scheme[non-terminal-subscript-style], and @scheme[z]
+has style @scheme[non-terminal-superscript-style].
+
+The
+@scheme[non-terminal-subscript-style] is used for the portion
 after the underscore in non-terminal references.
 
-The default-style is used for parenthesis, the dot in dotted
+The @scheme[default-style] is used for parenthesis, the dot in dotted
 lists, spaces, the separator words in the grammar, the
 "where" and "fresh" in side-conditions, and other places
 where the other parameters aren't used.