Merge branch 'master' of https://github.com/mbutterick/beautiful-racket

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

@@ -30,70 +30,38 @@
        (parameterize ([cmd-line-mode? #t])
          (do-place)))))
 
+
+;; ==============================================================
+;; Process parse trees from the reader:
+
 (provide txtadv-program)
-(define #'(txtadv-program _section ...)
-  #'(module-begin _section ...))
+(define #'txtadv-program #'module-begin)
 
 (provide verb-section)
-(define-inverting #'(verb-section _heading _verb-item ...)
+(define #'(verb-section
+           ((_name0 . _transitive0?)
+            (_name . _transitive?) ... _desc) ...)
   (inject-syntax ([#'in-verbs (shared-syntax 'in-verbs)])
                  #'(define-verbs in-verbs
-                     _verb-item ...)))
-
-
-(provide verb-item)
-(define-inverting #'(verb-item (_name0 _transitive0?) (_name _transitive?) ... _desc)
-  #`[_name0 #,@(if (syntax->datum #'_transitive0?) #'(_) #'()) (= _name ...) _desc])
-
-(provide verb-name)
-(define-cases #'verb-name
-  ;; cases with literals go first, so they're not caught by wildcards
-  [#'(_ "," _id) #'(_id #f)]
-  [#'(_ "," _id _underscore) #'(_id #t)]
-  [#'(_ _id) #'(_id #f)]
-  [#'(_ _id _underscore) #'(_id #t)])
+                     [_name0 #,@(if (syntax->datum #'_transitive0?) #'(_) #'()) (= _name ...) _desc] ...)))
 
 (provide everywhere-section)
-(define-inverting #'(everywhere-section _heading [_name _desc] ...)
+(define #'(everywhere-section [_id _desc] ...)
   #'(define-everywhere everywhere-actions
-      ([_name _desc] ...)))
-
-(provide id-desc)
-(define-inverting #'(id-desc _id _desc)
-  #'(_id _desc))
+      ([_id _desc] ...)))
 
 (provide things-section)
-(define-inverting #'(things-section _heading _thing ...)
-  #'(begin _thing ...))
-
-(provide thing-item)
-(define-inverting #'(thing-item _thingname (_actionname _actiondesc) ...)
-  #'(define-thing _thingname [_actionname _actiondesc] ...))
+(define #'(things-section (_thingname (_actionname _actiondesc) ...) ...)
+  #'(begin (define-thing _thingname [_actionname _actiondesc] ...) ...))
 
 (provide places-section)
-(define-inverting #'(places-section _heading _placeitem ...)
-  #'(begin _placeitem ...))
-
-(provide place-item)
-(define-inverting #'(place-item _place-id _place-desc [_place-item ...] [_actionname _actiondesc] ...)
-  #'(define-place _place-id _place-desc [_place-item ...] ([_actionname _actiondesc] ...)))
-
-(provide place-descrip)
-(define #'(place-descrip _desc) #'_desc)
-
-(provide place-items)
-(define-inverting #'(place-items "[" _id ... "]") #'(_id ...))
-
-(provide place-name)
-(define-cases #'place-name
-  [#'(_ "," _id) #'_id]
-  [#'(_ _id) #'_id])
-
+(define #'(places-section (_place-id _place-desc [_place-item ...] [_actionname _actiondesc] ...) ...)
+  #'(begin (define-place _place-id _place-desc [_place-item ...] ([_actionname _actiondesc] ...)) ...))
 
 (provide s-exp)
 (define-cases-inverting #'s-exp
-  [#'(_ "(" _sx ... ")") #'(_sx ...)]
-  [#'(_ _sx) #'_sx])
+  [#'(_ _sx) #'_sx]
+  [#'(_ _sx ... ) #'(_sx ...)])
 
 
 ;; todo: consolidate the game-starters.
@@ -107,7 +75,7 @@
                               everywhere-actions)))
 
 (provide start-section)
-(define #'(start-section _heading _where)
+(define #'(start-section _where)
   (inject-syntax ([#'in-verbs (shared-syntax 'in-verbs)])
                  #'(init-game _where
                               in-verbs

beautiful-racket/br/demo/txtadv/parser.rkt

@@ -2,30 +2,26 @@
 
 txtadv-program : verb-section everywhere-section things-section places-section start-section
 
-verb-section : "===VERBS===" verb-item+
+verb-section : <"===VERBS==="> verb-item+
 
-verb-item : verb-name+ s-exp
+<verb-item> : verb-name+ s-exp
 
-verb-name : [","] ID ["_"]
+<verb-name> : [<",">] ID ["_"]
 
-everywhere-section : "===EVERYWHERE===" id-desc+
+everywhere-section : <"===EVERYWHERE==="> id-desc+
 
-things-section : "===THINGS===" thing-item+
+things-section : <"===THINGS==="> thing-item+
 
-thing-item : DASHED-NAME id-desc+
+<thing-item> : DASHED-NAME id-desc+
 
-places-section : "===PLACES===" place-item+
+places-section : <"===PLACES==="> place-item+
 
-place-item : DASHED-NAME place-descrip place-items id-desc+
+<place-item> : DASHED-NAME STRING place-items id-desc+
 
-place-descrip : STRING ; `place-desc` is already used in expander
+<place-items> : <"["> ([<",">] ID)* <"]">
 
-place-items : "[" place-name* "]" ; `place-things` is already used
+start-section : <"===START==="> ID
 
-place-name : [","] ID
+<id-desc> : ID s-exp
 
-start-section : "===START===" place-name
-
-id-desc : ID s-exp
-
-s-exp : ID | STRING | "(" s-exp* ")"
+s-exp : ID | STRING | <"("> s-exp* <")">

brag/brag/codegen/codegen.rkt

@@ -1,4 +1,4 @@
-#lang br
+#lang racket/base
 
 (require (for-template racket/base)
          racket/list
@@ -38,26 +38,10 @@
        
        ;; We flatten the rules so we can use the yacc-style ruleset that parser-tools
        ;; supports.
-       
-       #|
-       MB: `rules` still carries 'hide syntax property
-       |#
-       #;(report flattened-rules)
-
-
-       #|
-       MB: `flattened-rules` still carries 'hide syntax property
-       |#
        (define flattened-rules (flatten-rules rules))
-       #;(report flattened-rules)
        
        (define generated-rule-codes (map flat-rule->yacc-rule flattened-rules))
        
-       #|
-       MB: `generated-rule-codes` loses the 'hide syntax property
-       |#
-       #;(report generated-rule-codes)
-       
        ;; The first rule, by default, is the start rule.
        (define rule-ids (for/list ([a-rule (in-list rules)])
                                   (rule-id a-rule)))
@@ -179,7 +163,6 @@
 ;;     stx :== (name (U tokens rule-stx) ...)
 ;;
 (define (flat-rule->yacc-rule a-flat-rule)
-  #;(report a-flat-rule)
   (syntax-case a-flat-rule ()
     [(rule-type origin name clauses ...)
      (begin
@@ -216,6 +199,8 @@
     (for/list ([translated-pattern (in-list translated-patterns)]
                [primitive-pattern (syntax->list a-clause)]
                [pos (in-naturals 1)])
+              (if (syntax-property primitive-pattern 'hide)
+                  #'null
                   (with-syntax ([$X 
                                  (format-id translated-pattern "$~a" pos)]
                                 [$X-start-pos 
@@ -233,12 +218,10 @@
                             (syntax->list #'rest)])]
                       [(id val)
                        #'(list $X)]
-                  ;; move the 'hide syntax property into the translated-action
-                  ;; because syntax gets datum-ized
                       [(lit val)
-                   #`(list (atomic-datum->syntax $X $X-start-pos $X-end-pos #,(syntax-property primitive-pattern 'hide)))]
+                       #'(list (atomic-datum->syntax $X $X-start-pos $X-end-pos))]
                       [(token val)
-                   #`(list (atomic-datum->syntax $X $X-start-pos $X-end-pos #,(syntax-property primitive-pattern 'hide)))]))))
+                       #'(list (atomic-datum->syntax $X $X-start-pos $X-end-pos))])))))
   
   (define whole-rule-loc
     (if (empty? translated-patterns)
@@ -247,11 +230,13 @@
                       [$n-end-pos (format-id (last translated-patterns) "$~a-end-pos" (length translated-patterns))])
           #`(positions->srcloc $1-start-pos $n-end-pos))))
 
+  ;; move 'splice property into function because name is datum-ized
   (with-syntax ([(translated-pattern ...) translated-patterns]
                 [(translated-action ...) translated-actions])
     #`[(translated-pattern ...)
        (rule-components->syntax '#,rule-name/false translated-action ...
-                                #:srcloc #,whole-rule-loc)]))
+                                #:srcloc #,whole-rule-loc
+                                #:splice? #,(syntax-property rule-name/false 'splice))]))
 
 
 

brag/brag/codegen/flatten.rkt

@@ -1,4 +1,4 @@
-#lang br
+#lang racket/base
 (require brag/rules/stx-types
          (for-syntax racket/base))
 

brag/brag/codegen/runtime.rkt

@@ -1,4 +1,4 @@
-#lang br
+#lang racket/base
 
 (require racket/match 
          racket/list
@@ -150,26 +150,30 @@ This would be the place to check a syntax property for hiding.
 (define stx-with-original?-property
   (read-syntax #f (open-input-string "meaningless-string")))
 
-(define elided (gensym))
 
 ;; atomic-datum->syntax: datum position position
 ;; Helper that does the ugly work in wrapping a datum into a syntax
 ;; with source location.
-(define (atomic-datum->syntax d start-pos end-pos [hide? #f])
-  (if hide?
-      elided
-      (datum->syntax #f d (positions->srcloc start-pos end-pos) stx-with-original?-property)))
-
+(define (atomic-datum->syntax d start-pos end-pos)
+  (datum->syntax #f d (positions->srcloc start-pos end-pos) stx-with-original?-property))
 
 
+(define splice-signal '@)
 ;; rule-components->syntax: (U symbol false) (listof stx) ... #:srcloc (U #f (list src line column offset span)) -> stx
 ;; Creates an stx out of the rule name and its components.
 ;; The location information of the rule spans that of its components.
-(define (rule-components->syntax rule-name/false #:srcloc [srcloc #f] . components)
-  (define flattened-elided-components (filter-not (λ(c) (eq? c elided)) (apply append components)))
+(define (rule-components->syntax rule-name/false #:srcloc [srcloc #f] #:splice? [splice #f] . componentss)
+  (let ([spliced-componentss (append-map (λ(cs)
+                                   (if (and (pair? cs) (syntax-property (car cs) 'splice))
+                                            (list (list (syntax-case (car cs) ()
+                                                    [(rule-name c ...)
+                                                     #'(c ...)])))
+                                            (list cs))) componentss)])
+    (syntax-property
      (datum->syntax #f 
                     (cons
                      (datum->syntax #f rule-name/false srcloc stx-with-original?-property)
-                        flattened-elided-components)
+                     (apply append spliced-componentss))
                     srcloc
-                 stx-with-original?-property))
+                    stx-with-original?-property)
+     'splice splice)))

brag/brag/elider/json-elider-toy.rkt

@@ -1,4 +0,0 @@
-#lang brag
-
-;; Simple baby example of JSON structure
-json: ID <":"> ID

brag/brag/examples/baby-json-hider.rkt

@@ -1,8 +1,7 @@
 #lang brag
 
 ;; Simple baby example of JSON structure
-json: number
-    | string
+json: number | string
     | array
     | object
 
@@ -14,4 +13,4 @@ array: "[" [json ("," json)*] "]"
 
 object: <"{"> [kvpair ("," kvpair)*] <"}">
 
-kvpair: <ID> <":"> json
+<kvpair>: <ID> ":" <json>

brag/brag/rules/lexer.rkt

@@ -22,9 +22,6 @@
       (:+ id-char)))
 
 
-
-
-
 (define lex/1
   (lexer-src-pos
    [(:: "'"
@@ -64,6 +61,8 @@
     (token-EOF lexeme)]
    [(:: id (:* whitespace) ":")
     (token-RULE_HEAD lexeme)]
+   [(:: "<" id ">" (:* whitespace) ":")
+    (token-RULE_HEAD_HIDDEN lexeme)]
    [id
     (token-ID lexeme)]
    

brag/brag/rules/parser.rkt

@@ -1,4 +1,4 @@
-#lang br
+#lang racket/base
 (require parser-tools/yacc
          parser-tools/lex
          racket/list
@@ -17,6 +17,7 @@
          token-PIPE
          token-REPEAT
          token-RULE_HEAD
+         token-RULE_HEAD_HIDDEN
          token-ID
          token-LIT
          token-EOF
@@ -45,6 +46,7 @@
                        PIPE
                        REPEAT
                        RULE_HEAD
+                       RULE_HEAD_HIDDEN
                        ID
                        LIT
                        EOF))
@@ -84,6 +86,21 @@
                            (position-col $1-start-pos))
                       trimmed
                       #f)
+              $2))]
+     
+     ;; angles indicate splicing. set splice value to #t
+     [(RULE_HEAD_HIDDEN pattern)
+      (begin
+        (define trimmed (cadr (regexp-match #px"<(.+)>\\s*:$" $1)))
+        (rule (position->pos $1-start-pos)
+              (position->pos $2-end-pos)
+              (lhs-id (position->pos $1-start-pos)
+                      (pos (+ (position-offset $1-start-pos)
+                              (string-length trimmed))
+                           (position-line $1-start-pos)
+                           (position-col $1-start-pos))
+                      trimmed
+                      #t)
               $2))]]
     
     [pattern

brag/brag/rules/rule-structs.rkt

@@ -12,7 +12,7 @@
 (struct rule (start end lhs pattern)
         #:transparent)
 
-(struct lhs-id (start end val hide)
+(struct lhs-id (start end val splice)
         #:transparent)
 
 

brag/brag/rules/stx.rkt

@@ -1,4 +1,4 @@
-#lang br
+#lang racket/base
 
 (require "rule-structs.rkt"
          parser-tools/lex
@@ -21,6 +21,7 @@
 
 (define (rule->stx source a-rule)
   (define id-stx
+    (syntax-property
      (datum->syntax #f
                     (string->symbol (lhs-id-val (rule-lhs a-rule)))
                     (list source
@@ -31,7 +32,8 @@
                                    (number? (pos-offset (lhs-id-end (rule-lhs a-rule)))))
                               (- (pos-offset (lhs-id-end (rule-lhs a-rule)))
                                  (pos-offset (lhs-id-start (rule-lhs a-rule))))
-                             #f))))
+                              #f)))
+     'splice (lhs-id-splice (rule-lhs a-rule))))
   (define pattern-stx (pattern->stx source (rule-pattern a-rule)))
   (define line (pos-line (rule-start a-rule)))
   (define column (pos-col (rule-start a-rule)))

brag/brag/test/test-all.rkt

@@ -1,4 +1,4 @@
-#lang br
+#lang racket/base
 
 
 (require "test-0n1.rkt"

brag/brag/test/test-baby-json-hider.rkt

@@ -1,5 +1,5 @@
-#lang br
-(require "json-elider.rkt"
+#lang racket/base
+(require brag/examples/baby-json-hider
          brag/support
          rackunit)
 
@@ -10,7 +10,7 @@
                ":"
                (token 'STRING "'hello world'")
                "}")))
- '(json (object (kvpair (json (string "'hello world'"))))))
+ '(json (object (":"))))
 
 
 (check-equal? 

brag/brag/test/test-parser.rkt

@@ -1,4 +1,4 @@
-#lang br
+#lang racket/base
 
 
 (require rackunit