simplify

beautiful-racket/br/demo/basic/#sinewave.bas#2#

@@ -0,0 +1,250 @@
+#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/
+|#
+ 22 7 #"wxtext\0"
+3 1 6 #"wxtab\0"
+1 1 8 #"wximage\0"
+2 0 8 #"wxmedia\0"
+4 1 34 #"(lib \"syntax-browser.ss\" \"mrlib\")\0"
+1 0 16 #"drscheme:number\0"
+3 0 44 #"(lib \"number-snip.ss\" \"drscheme\" \"private\")\0"
+1 0 36 #"(lib \"comment-snip.ss\" \"framework\")\0"
+1 0 93
+(
+ #"((lib \"collapsed-snipclass.ss\" \"framework\") (lib \"collapsed-sni"
+ #"pclass-wxme.ss\" \"framework\"))\0"
+) 0 0 43 #"(lib \"collapsed-snipclass.ss\" \"framework\")\0"
+0 0 19 #"drscheme:sexp-snip\0"
+0 0 36 #"(lib \"cache-image-snip.ss\" \"mrlib\")\0"
+1 0 68
+(
+ #"((lib \"image-core.ss\" \"mrlib\") (lib \"image-core-wxme.rkt\" \"mr"
+ #"lib\"))\0"
+) 1 0 29 #"drscheme:bindings-snipclass%\0"
+1 0 101
+(
+ #"((lib \"ellipsis-snip.rkt\" \"drracket\" \"private\") (lib \"ellipsi"
+ #"s-snip-wxme.rkt\" \"drracket\" \"private\"))\0"
+) 2 0 88
+(
+ #"((lib \"pict-snip.rkt\" \"drracket\" \"private\") (lib \"pict-snip.r"
+ #"kt\" \"drracket\" \"private\"))\0"
+) 0 0 34 #"(lib \"bullet-snip.rkt\" \"browser\")\0"
+0 0 25 #"(lib \"matrix.ss\" \"htdp\")\0"
+1 0 22 #"drscheme:lambda-snip%\0"
+1 0 29 #"drclickable-string-snipclass\0"
+0 0 26 #"drracket:spacer-snipclass\0"
+0 0 57
+#"(lib \"hrule-snip.rkt\" \"macro-debugger\" \"syntax-browser\")\0"
+1 0 1 6 #"wxloc\0"
+          0 0 64 0 1 #"\0"
+0 75 1 #"\0"
+0 12 90 -1 90 -1 3 -1 0 1 0 1 0 0 0 0 0 0 0 0 0 0 0 255 255 255 1 -1 0 9
+#"Standard\0"
+0 75 15 #"Triplicate T3c\0"
+0 16 90 -1 90 -1 3 -1 0 1 0 1 0 0 0 0 0 0 0 0 0 0 0 255 255 255 1 -1 2 1
+#"\0"
+0 -1 1 #"\0"
+1 0 -1 -1 -1 -1 -1 -1 0 0 0 0 0 0 1 1 1 1 1 1 0 0 0 0 0 0 -1 -1 2 24
+#"framework:default-color\0"
+0 -1 1 #"\0"
+1 0 -1 -1 -1 -1 -1 -1 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 255 255 255 -1 -1 2
+1 #"\0"
+0 -1 1 #"\0"
+1 0 -1 -1 -1 -1 -1 -1 0 0 0 0 0 0 0 0 0 1 1 1 150 0 150 0 0 0 -1 -1 2 15
+#"text:ports out\0"
+0 -1 1 #"\0"
+1 0 -1 -1 -1 -1 -1 -1 0 0 0 0 0 0 0 0 0 1 1 1 34 119 34 0 0 0 -1 -1 2 1
+#"\0"
+0 -1 1 #"\0"
+1.0 0 -1 -1 93 -1 -1 -1 0 0 0 0 0 0 0 0 0 1.0 1.0 1.0 255 0 0 0 0 0 -1
+-1 2 15 #"text:ports err\0"
+0 -1 1 #"\0"
+1 0 -1 -1 -1 -1 -1 -1 0 0 0 0 0 0 0 0 0 1 1 1 136 17 17 0 0 0 -1 -1 2 1
+#"\0"
+0 -1 1 #"\0"
+1 0 -1 -1 -1 -1 -1 -1 0 0 0 0 0 0 0 0 0 1 1 1 0 0 175 0 0 0 -1 -1 2 17
+#"text:ports value\0"
+0 -1 1 #"\0"
+1 0 -1 -1 -1 -1 -1 -1 0 0 0 0 0 0 0 0 0 1 1 1 34 34 119 0 0 0 -1 -1 2 1
+#"\0"
+0 -1 1 #"\0"
+1.0 0 92 -1 -1 -1 -1 -1 0 0 0 0 0 0 0 0 0 1.0 1.0 1.0 34 139 34 0 0 0 -1
+-1 2 27 #"Matching Parenthesis Style\0"
+0 -1 1 #"\0"
+1.0 0 92 -1 -1 -1 -1 -1 0 0 0 0 0 0 0 0 0 1.0 1.0 1.0 34 139 34 0 0 0 -1
+-1 2 1 #"\0"
+0 -1 1 #"\0"
+1 0 -1 -1 -1 93 -1 -1 0 1 0 0 0 0 0 0 0 1 1 1 38 38 128 0 0 0 -1 -1 2 37
+#"framework:syntax-color:scheme:symbol\0"
+0 -1 1 #"\0"
+1 0 -1 -1 -1 -1 -1 -1 0 0 0 0 0 0 0 0 0 1 1 1 34 34 119 0 0 0 -1 -1 2 38
+#"framework:syntax-color:scheme:keyword\0"
+0 -1 1 #"\0"
+1 0 -1 -1 -1 -1 -1 -1 0 0 0 0 0 0 0 0 0 1 1 1 34 34 119 0 0 0 -1 -1 2 1
+#"\0"
+0 -1 1 #"\0"
+1 0 -1 -1 -1 93 -1 -1 0 1 0 0 0 0 0 0 0 1 1 1 194 116 31 0 0 0 -1 -1 2
+38 #"framework:syntax-color:scheme:comment\0"
+0 -1 1 #"\0"
+1 0 -1 -1 -1 -1 -1 -1 0 0 0 0 0 0 0 0 0 1 1 1 119 34 119 0 0 0 -1 -1 2 1
+#"\0"
+0 -1 1 #"\0"
+1 0 -1 -1 -1 93 -1 -1 0 1 0 0 0 0 0 0 0 1 1 1 41 128 38 0 0 0 -1 -1 2 37
+#"framework:syntax-color:scheme:string\0"
+0 -1 1 #"\0"
+1 0 -1 -1 -1 -1 -1 -1 0 0 0 0 0 0 0 0 0 1 1 1 34 119 34 0 0 0 -1 -1 2 35
+#"framework:syntax-color:scheme:text\0"
+0 -1 1 #"\0"
+1 0 -1 -1 -1 -1 -1 -1 0 0 0 0 0 0 0 0 0 1 1 1 34 119 34 0 0 0 -1 -1 2 39
+#"framework:syntax-color:scheme:constant\0"
+0 -1 1 #"\0"
+1 0 -1 -1 -1 -1 -1 -1 0 0 0 0 0 0 0 0 0 1 1 1 34 119 34 0 0 0 -1 -1 2 1
+#"\0"
+0 -1 1 #"\0"
+1 0 -1 -1 -1 93 -1 -1 0 1 0 0 0 0 0 0 0 1 1 1 132 60 36 0 0 0 -1 -1 2 49
+#"framework:syntax-color:scheme:hash-colon-keyword\0"
+0 -1 1 #"\0"
+1 0 -1 -1 -1 -1 -1 -1 0 0 0 0 0 0 0 0 0 1 1 1 34 119 34 0 0 0 -1 -1 2 42
+#"framework:syntax-color:scheme:parenthesis\0"
+0 -1 1 #"\0"
+1 0 -1 -1 -1 -1 -1 -1 0 0 0 0 0 0 0 0 0 1 1 1 0 178 178 0 0 0 -1 -1 2 1
+#"\0"
+0 -1 1 #"\0"
+1 0 -1 -1 -1 93 -1 -1 0 1 0 0 0 0 0 0 0 1 1 1 255 0 0 0 0 0 -1 -1 2 36
+#"framework:syntax-color:scheme:error\0"
+0 -1 1 #"\0"
+1 0 -1 -1 -1 -1 -1 -1 0 0 0 0 0 0 0 0 0 1 1 1 136 17 17 0 0 0 -1 -1 2 1
+#"\0"
+0 -1 1 #"\0"
+1 0 -1 -1 -1 93 -1 -1 0 1 0 0 0 0 0 0 0 1 1 1 0 0 0 0 0 0 -1 -1 2 36
+#"framework:syntax-color:scheme:other\0"
+0 -1 1 #"\0"
+1 0 -1 -1 -1 -1 -1 -1 0 0 0 0 0 0 0 0 0 1 1 1 34 34 119 0 0 0 -1 -1 2 16
+#"Misspelled Text\0"
+0 -1 1 #"\0"
+1 0 -1 -1 -1 -1 -1 -1 0 0 0 0 0 0 0 0 0 1 1 1 0 0 0 0 0 0 -1 -1 2 1
+#"\0"
+0 -1 1 #"\0"
+1 0 -1 -1 -1 93 -1 -1 0 1 0 0 0 0 0 0 0 1 1 1 81 112 203 0 0 0 -1 -1 2
+38 #"drracket:check-syntax:lexically-bound\0"
+0 -1 1 #"\0"
+1 0 -1 -1 -1 93 -1 -1 0 1 0 0 0 0 0 0 0 1 1 1 81 112 203 0 0 0 -1 -1 2 1
+#"\0"
+0 -1 1 #"\0"
+1 0 -1 -1 -1 93 -1 -1 0 1 0 0 0 0 0 0 0 1 1 1 178 34 34 0 0 0 -1 -1 2 28
+#"drracket:check-syntax:set!d\0"
+0 -1 1 #"\0"
+1 0 -1 -1 -1 -1 -1 -1 0 0 0 0 0 0 0 0 0 1 1 1 136 17 17 0 0 0 -1 -1 2 37
+#"drracket:check-syntax:unused-require\0"
+0 -1 1 #"\0"
+1 0 -1 -1 -1 -1 -1 -1 0 0 0 0 0 0 0 0 0 1 1 1 136 17 17 0 0 0 -1 -1 2 36
+#"drracket:check-syntax:free-variable\0"
+0 -1 1 #"\0"
+1 0 -1 -1 -1 -1 -1 -1 0 0 0 0 0 0 0 0 0 1 1 1 136 17 17 0 0 0 -1 -1 2 1
+#"\0"
+0 -1 1 #"\0"
+1 0 -1 -1 -1 93 -1 -1 0 1 0 0 0 0 0 0 0 1 1 1 68 0 203 0 0 0 -1 -1 2 31
+#"drracket:check-syntax:imported\0"
+0 -1 1 #"\0"
+1 0 -1 -1 -1 93 -1 -1 0 1 0 0 0 0 0 0 0 1 1 1 68 0 203 0 0 0 -1 -1 2 47
+#"drracket:check-syntax:my-obligation-style-pref\0"
+0 -1 1 #"\0"
+1 0 -1 -1 -1 93 -1 -1 0 1 0 0 0 0 0 0 0 1 1 1 178 34 34 0 0 0 -1 -1 2 1
+#"\0"
+0 -1 1 #"\0"
+1 0 -1 -1 -1 93 -1 -1 0 1 0 0 0 0 0 0 0 1 1 1 0 116 0 0 0 0 -1 -1 2 50
+#"drracket:check-syntax:their-obligation-style-pref\0"
+0 -1 1 #"\0"
+1 0 -1 -1 -1 93 -1 -1 0 1 0 0 0 0 0 0 0 1 1 1 0 116 0 0 0 0 -1 -1 2 48
+#"drracket:check-syntax:unk-obligation-style-pref\0"
+0 -1 1 #"\0"
+1 0 -1 -1 -1 93 -1 -1 0 1 0 0 0 0 0 0 0 1 1 1 0 0 0 0 0 0 -1 -1 2 1
+#"\0"
+0 -1 1 #"\0"
+1 0 -1 -1 -1 93 -1 -1 0 1 0 0 0 0 0 0 0 1 1 1 139 142 28 0 0 0 -1 -1 2
+49 #"drracket:check-syntax:both-obligation-style-pref\0"
+0 -1 1 #"\0"
+1 0 -1 -1 -1 93 -1 -1 0 1 0 0 0 0 0 0 0 1 1 1 139 142 28 0 0 0 -1 -1 2
+37 #"plt:module-language:test-coverage-on\0"
+0 -1 1 #"\0"
+1 0 -1 -1 -1 93 -1 -1 0 1 0 0 0 0 0 0 0 1 1 1 0 0 0 0 0 0 -1 -1 2 1
+#"\0"
+0 -1 1 #"\0"
+1 0 -1 -1 -1 93 -1 -1 0 1 0 0 0 1 0 0 0 0 0 0 255 165 0 0 0 0 -1 -1 2 38
+#"plt:module-language:test-coverage-off\0"
+0 -1 1 #"\0"
+1 0 -1 -1 -1 93 -1 -1 0 1 0 0 0 1 0 0 0 0 0 0 255 165 0 0 0 0 -1 -1 4 1
+#"\0"
+0 71 1 #"\0"
+1.0 0 -1 -1 -1 -1 -1 -1 0 0 0 0 0 0 1.0 1.0 1.0 1.0 1.0 1.0 0 0 0 0 0 0
+-1 -1 4 1 #"\0"
+0 -1 1 #"\0"
+1.0 0 -1 -1 -1 -1 -1 -1 1 0 0 0 0 0 0 0 0 1.0 1.0 1.0 0 0 255 0 0 0 -1
+-1 4 1 #"\0"
+0 71 1 #"\0"
+1.0 0 -1 -1 -1 -1 -1 -1 1 0 0 0 0 0 0 0 0 1.0 1.0 1.0 0 0 255 0 0 0 -1
+-1 4 1 #"\0"
+0 71 1 #"\0"
+1.0 0 -1 -1 -1 -1 -1 -1 0 0 0 0 0 0 0 0 0 1.0 1.0 1.0 0 100 0 0 0 0 -1
+-1 4 1 #"\0"
+0 -1 1 #"\0"
+1.0 0 92 -1 -1 -1 -1 -1 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 255 255 0 -1 -1 2
+1 #"\0"
+0 -1 1 #"\0"
+1 0 -1 -1 -1 -1 -1 -1 0 0 0 0 0 0 0 0 0 1 1 1 200 0 0 0 0 0 -1 -1 0 1
+#"\0"
+0 75 1 #"\0"
+1.0 0 -1 -1 -1 -1 -1 -1 0 0 0 0 0 0 1.0 1.0 1.0 1.0 1.0 1.0 0 0 0 0 0 0
+-1 -1 2 1 #"\0"
+0 75 1 #"\0"
+1.0 0 -1 -1 -1 -1 -1 -1 0 0 0 0 0 0 1.0 1.0 1.0 1.0 1.0 1.0 0 0 0 0 0 0
+-1 -1 2 1 #"\0"
+0 75 1 #"\0"
+1.0 0 -1 -1 -1 -1 -1 -1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 255 255 255 -1 -1
+2 1 #"\0"
+0 75 1 #"\0"
+1.0 0 -1 -1 -1 -1 -1 -1 0 0 0 0 0 0 0 0 0 0 0 0 34 139 34 255 255 255 -1
+-1 2 1 #"\0"
+0 -1 1 #"\0"
+1.0 0 92 -1 -1 -1 -1 -1 0 0 0 0 0 0 0 0 0 1.0 1.0 1.0 36 36 140 0 0 0 -1
+-1 2 1 #"\0"
+0 -1 1 #"\0"
+1.0 0 92 -1 -1 -1 -1 -1 0 0 0 0 0 0 1.0 1.0 1.0 1.0 1.0 1.0 0 0 0 0 0 0
+-1 -1 2 1 #"\0"
+0 -1 1 #"\0"
+0 4 -1 -1 -1 -1 -1 -1 0 0 0 0 0 0 1.0 1.0 1.0 1.0 1.0 1.0 0 0 0 0 0 0 -1
+-1 2 1 #"\0"
+0 75 1 #"\0"
+1.0 0 92 -1 -1 -1 -1 -1 0 0 0 0 0 0 0 0 0 1.0 1.0 1.0 36 36 140 0 0 0 -1
+-1 2 1 #"\0"
+0 75 1 #"\0"
+1.0 0 92 -1 -1 -1 -1 -1 0 0 0 0 0 0 1.0 1.0 1.0 1.0 1.0 1.0 0 0 0 0 0 0
+-1 -1 2 1 #"\0"
+0 75 1 #"\0"
+0 4 -1 -1 -1 -1 -1 -1 0 0 0 0 0 0 1.0 1.0 1.0 1.0 1.0 1.0 0 0 0 0 0 0 -1
+-1 4 1 #"\0"
+0 -1 1 #"\0"
+1 0 -1 -1 -1 -1 -1 -1 0 0 0 0 0 0 1 1 1 1 1 1 0 0 0 0 0 0 -1 -1
+          0 13 0 28 3 19 #"#lang br/demo/basic"
+0 0 24 29 1 #"\n"
+0 0 24 29 1 #"\n"
+0 0 21 3 2 #"50"
+0 0 24 3 1 #" "
+0 0 14 3 5 #"PRINT"
+0 0 24 3 1 #" "
+0 0 14 3 3 #"INT"
+0 0 24 3 1 #"("
+0 0 14 3 3 #"RND"
+0 0 24 3 1 #"("
+0 0 21 3 2 #"10"
+0 0 24 3 2 #"))"
+0           0

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

@@ -16,10 +16,10 @@
       (displayln (format "got unbound identifier: ~a" 'id))
       (procedure-rename (λ xs (cons 'id xs)) (format-datum "undefined:~a" 'id))))
 
-(define #'(basic-program CR-LINE ...)
+(define #'(program LINE ...)
-  #'(basic-run CR-LINE ...))
+  #'(run (list LINE ...)))
 
-(define (basic-run . lines)
+(define (run lines)
   (define program-lines (list->vector (filter (λ(ln) (not (equal? ln "cr"))) lines)))
   (void (for/fold ([line-idx 0])
                   ([i (in-naturals)]
@@ -52,7 +52,12 @@
   [#'(value ID "(" ARG ... ")") #'(ID ARG ...)]
   [#'(value ID-OR-DATUM) #'(hash-ref vars 'ID-OR-DATUM (λ _ ID-OR-DATUM))])
 
-(define #'(expr EXPR) #'EXPR)
+(define-cases expr
+  [(_ lexpr op rexpr) (if (op lexpr rexpr)
+                              1
+                              0)]
+  [(_ expr) expr])
+(provide < > <= >=)
 
 (define-cases sum
   [(_ term op sum) (op term sum)]
@@ -76,6 +81,7 @@
 (define (TAB num) (make-string num #\space))
 (define (INT num) (inexact->exact (round num)))
 (define (SIN num) (sin num))
+(define (RND num) (* (random) num))
 
 (define (GOTO where)
   where)

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

@@ -1,6 +1,7 @@
 #lang ragg
 
-basic-program : line [CR line]*
+;; recursive rules destucture easily in the expander
+program : line [CR line]*
 
 line: INTEGER statement+
 
@@ -16,14 +17,13 @@ statement : "END"
 
 print-list : [expr [";" [print-list]]]
 
-expr : sum [("=" | ">" | "<" | "<>") expr]
+expr : sum [("=" | ">" | ">=" | "<" | "<=" | "<>") expr]
 
 sum : product [("+" | "-") sum]
 
 product : value [("*" | "/") product]
 
-value : "(" expr ")"
+value : ID ["(" expr* ")"]
-| ID ["(" expr* ")"]
 | INTEGER
 | STRING
 | REAL