sense being made
This commit is contained in:
Matthew Butterick
parent
67a16a6b1d
commit
d6baa0508e
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@ -1,20 +1,26 @@
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#lang br
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(provide (all-defined-out)
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#%top-interaction
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#%datum
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(rename-out [basic-module-begin #%module-begin]))
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(require (for-syntax racket/string))
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(provide #%top-interaction #%app #%datum
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(rename-out [basic-module-begin #%module-begin])
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(rename-out [basic-top #%top])
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(all-defined-out))
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(require (for-syntax racket/syntax))
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(define #'(basic-module-begin PARSE-TREE ...)
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#'(#%module-begin
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(println (quote PARSE-TREE ...))
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'PARSE-TREE ...))
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PARSE-TREE ...))
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(define #'(basic-program LINE ...)
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#'(basic-run LINE ...))
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; #%app and #%datum have to be present to make #%top work
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(define #'(basic-top . id)
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#'(begin
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(displayln (format "got unbound identifier: ~a" 'id))
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(procedure-rename (λ xs (cons 'id xs)) (format-datum "undefined:~a" 'id))))
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(define #'(basic-program CR-LINE ...)
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#'(begin CR-LINE ...))
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(define (basic-run . lines)
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(define program-lines (list->vector (filter (λ(x) x) lines)))
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(define program-lines (list->vector lines))
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(void (for/fold ([line-idx 0])
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([i (in-naturals)]
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#:break (= line-idx (vector-length program-lines)))
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@ -28,60 +34,47 @@
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idx)))
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(add1 line-idx)))))
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(define #'(CR) #'#f)
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(define-cases #'cr-line ; erases "cr"s
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[#'(_ "cr" LINE) #'LINE]
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[#'(_ "cr") #'(begin)])
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(define #'(REM ARG ...) #'(void (list 'ARG ...)))
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(define #'(line NUMBER STATEMENT ...)
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#'(begin STATEMENT ...))
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;; model each line as (cons line-number line-thunk)
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(define-cases #'line
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[#'(_ NUMBER . SEPARATED-STMTS)
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#`(cons NUMBER
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(λ _ (begin
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#,@(for/list ([(item idx) (in-indexed (syntax->list #'SEPARATED-STMTS))]
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#:when (even? idx))
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item))))]
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[#'(_ ARG ...) #'(line #f ARG ...)])
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(define-cases #'statement
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[#'(statement ID "=" EXPR) (if (identifier-binding #'ID)
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#'(set! ID EXPR)
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#'(define ID EXPR))]
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[#'(statement PROC ARG ...) #'(PROC ARG ...)])
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(define #'(statement NAME ARG ...) #'(NAME ARG ...))
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(define-cases #'value
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[#'(value "(" EXPR ")") #'EXPR]
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[#'(value ID "(" ARG ... ")") #'(ID ARG ...)]
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[#'(value DATUM) #'DATUM])
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(define #'(expression ITEM) #'ITEM)
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(define #'(unsignedexpr ITEM) #'ITEM)
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(define #'(term ITEM) #'ITEM)
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(define #'(factor ITEM) #'ITEM)
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(define #'(number ITEM) #'ITEM)
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(define #'(varlist ITEM) #'ITEM)
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(define #'(var ITEM) #'ITEM)
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(define #'(expr EXPR) #'EXPR)
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(define-cases sum
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[(_ term op sum) (op term sum)]
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[(_ term) term])
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(provide - +)
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(define #'(printitem EXPR-OR-STRING) #'EXPR-OR-STRING)
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(define-cases product
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[(_ factor op product) (op factor product)]
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[(_ factor) factor])
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(provide * /)
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;; skip separators
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(define #'(printlist . SEPARATED-ITEMS) #`(list #,@(for/list ([(item idx) (in-indexed (syntax->list #'SEPARATED-ITEMS))]
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#:when (even? idx))
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item)))
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(define print-list list)
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(define #'(separator SEP) #'(void))
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(define (PRINT args)
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(match args
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[(list) (displayln "")]
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[(list items ... ";" pl) (begin (for-each display items) (PRINT pl))]
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[(list items ... ";") (for-each display items)]
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[(list items ...) (for-each displayln items)]))
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(define #'(function NAME EXP ")") #`(#,(string->symbol (string-trim (syntax->datum #'NAME) "(")) EXP))
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(define (TAB expr)
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(make-string expr #\space))
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(define (PRINT . args)
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(println args)
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(if (and (= (length args) 1) (list? (car args)))
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(begin
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(for-each display (car args))
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(displayln ""))
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(filter (λ(i) (and (equal? i ":") (displayln ""))) args)))
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(define (GOTO where)
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where)
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(define vars (make-hasheq))
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(define (INPUT id)
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(hash-set! vars (string->symbol id) (read (open-input-string (read-line)))))
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(define-cases #'expr-list
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[#'(_ EXPR ...) #'(list EXPR ...)])
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(define (TAB num) (make-string num #\space))
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(define (INT num) (inexact->exact (round num)))
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(define (SIN num) (sin num))
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(define (comment . args) void)
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87
beautiful-racket/br/demo/basic/expander0.rkt
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87
beautiful-racket/br/demo/basic/expander0.rkt
Normal file
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@ -0,0 +1,87 @@
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#lang br
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(provide (all-defined-out)
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#%top-interaction
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#%datum
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(rename-out [basic-module-begin #%module-begin]))
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(require (for-syntax racket/string))
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(define #'(basic-module-begin PARSE-TREE ...)
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#'(#%module-begin
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(println (quote PARSE-TREE ...))
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'PARSE-TREE ...))
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(define #'(basic-program LINE ...)
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#'(basic-run LINE ...))
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(define (basic-run . lines)
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(define program-lines (list->vector (filter (λ(x) x) lines)))
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(void (for/fold ([line-idx 0])
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([i (in-naturals)]
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#:break (= line-idx (vector-length program-lines)))
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(match-define (cons line-number proc)
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(vector-ref program-lines line-idx))
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(define maybe-jump-number (and proc (proc)))
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(if (number? maybe-jump-number)
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(let ([jump-number maybe-jump-number])
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(for/or ([idx (in-range (vector-length program-lines))])
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(and (= (car (vector-ref program-lines idx)) jump-number)
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idx)))
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(add1 line-idx)))))
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(define #'(CR) #'#f)
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(define #'(REM ARG ...) #'(void (list 'ARG ...)))
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;; model each line as (cons line-number line-thunk)
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(define-cases #'line
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[#'(_ NUMBER . SEPARATED-STMTS)
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#`(cons NUMBER
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(λ _ (begin
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#,@(for/list ([(item idx) (in-indexed (syntax->list #'SEPARATED-STMTS))]
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#:when (even? idx))
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item))))]
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[#'(_ ARG ...) #'(line #f ARG ...)])
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(define #'(statement NAME ARG ...) #'(NAME ARG ...))
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(define #'(expression ITEM) #'ITEM)
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(define #'(unsignedexpr ITEM) #'ITEM)
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(define #'(term ITEM) #'ITEM)
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(define #'(factor ITEM) #'ITEM)
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(define #'(number ITEM) #'ITEM)
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(define #'(varlist ITEM) #'ITEM)
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(define #'(var ITEM) #'ITEM)
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(define #'(printitem EXPR-OR-STRING) #'EXPR-OR-STRING)
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;; skip separators
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(define #'(printlist . SEPARATED-ITEMS) #`(list #,@(for/list ([(item idx) (in-indexed (syntax->list #'SEPARATED-ITEMS))]
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#:when (even? idx))
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item)))
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(define #'(separator SEP) #'(void))
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(define #'(function NAME EXP ")") #`(#,(string->symbol (string-trim (syntax->datum #'NAME) "(")) EXP))
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(define (TAB expr)
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(make-string expr #\space))
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(define (PRINT . args)
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(println args)
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(if (and (= (length args) 1) (list? (car args)))
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(begin
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(for-each display (car args))
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(displayln ""))
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(filter (λ(i) (and (equal? i ":") (displayln ""))) args)))
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(define (GOTO where)
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where)
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(define vars (make-hasheq))
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(define (INPUT id)
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(hash-set! vars (string->symbol id) (read (open-input-string (read-line)))))
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(define-cases #'expr-list
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[#'(_ EXPR ...) #'(list EXPR ...)])
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@ -1,62 +1,32 @@
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#lang ragg
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;; adapted from http://www.ittybittycomputers.com/IttyBitty/TinyBasic/TBuserMan.txt
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;; MS Basic extensions
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;; http://www.atariarchives.org/basicgames/showpage.php?page=i12
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basic-program : cr-line* [CR]
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;; games
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;; http://www.vintage-basic.net/games.html
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cr-line : CR line [cr-line]
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;; chipmunk basic
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;; http://www.nicholson.com/rhn/basic/basic.man.html
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line: INTEGER statement+
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basic-program : [CR] lines [CR]
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lines : INTEGER statements [CR | CR lines]
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statements : statement [":" statements]
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statement : "CLOSE" "#" INTEGER
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| "END"
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statement : "END"
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| "FOR" ID "=" expr "TO" expr ["STEP" expr]
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| "GOTO" expr
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| "IF" expr "THEN" (statement | expr) ; change: add expr
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| "INPUT" id-list
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| "INPUT" ID+
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| ["LET"] ID "=" expr ; change: make "LET" opt
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| "NEXT" id-list
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| "PRINT" printlist
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| "REM" STRING
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| "NEXT" ID+
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| "PRINT" print-list
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| REM-COMMENT
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id-list : ID ["," id-list]
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print-list : [expr [";" [print-list]*]]
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value-list : value ["," value-list]
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expr : sum [("=" | "<>" | "><" | ">" | ">=" | "<" | "<=") expr]
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constant-list : constant ["," constant-list]
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sum : product [("+" | "-") sum]+
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integer-list : INTEGER ["," integer-list]
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expr-list : expr ["," expr-list]
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printlist : [expr [";" printlist]]
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expr : and-expr ["OR" expr]
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and-expr : not-expr ["AND" and-expr]
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not-expr : ["NOT"] compare-expr
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compare-expr : add-expr [("=" | "<>" | "><" | ">" | ">=" | "<" | "<=") compare-expr]
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add-expr : mult-expr [("+" | "-") add-expr]
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mult-expr : negate-expr [("*" | "/") mult-expr]
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negate-expr : ["-"] power-expr
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power-expr : [power-expr "^"] value
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product : value [("*" | "/") product]+
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value : "(" expr ")"
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| ID ["(" expr-list ")"]
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| constant
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| ID ["(" expr* ")"]
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| INTEGER
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| STRING
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| REAL
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constant : INTEGER | STRING | REAL
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61
beautiful-racket/br/demo/basic/parser0.rkt
Normal file
61
beautiful-racket/br/demo/basic/parser0.rkt
Normal file
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@ -0,0 +1,61 @@
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#lang ragg
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;; adapted from http://www.ittybittycomputers.com/IttyBitty/TinyBasic/TBuserMan.txt
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;; MS Basic extensions
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;; http://www.atariarchives.org/basicgames/showpage.php?page=i12
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;; games
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;; http://www.vintage-basic.net/games.html
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;; chipmunk basic
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;; http://www.nicholson.com/rhn/basic/basic.man.html
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basic-program : [CR] line [CR line]* [CR]
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line: INTEGER statements
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statements : statement [":" statement]*
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statement : "END"
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| "FOR" ID "=" expr "TO" expr ["STEP" expr]
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| "GOTO" expr
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| "IF" expr "THEN" (statement | expr) ; change: add expr
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| "INPUT" id-list
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| ["LET"] ID "=" expr ; change: make "LET" opt
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| "NEXT" id-list
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| "PRINT" print-list
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| "REM" STRING
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id-list : ID ["," id-list]
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;value-list : value ["," value]*
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;datum-list : datum ["," datum]*
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;integer-list : INTEGER ["," INTEGER]*
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expr-list : expr ["," expr]*
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print-list : [expr [";" print-list]]
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;expr : and-expr ["OR" expr]
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;and-expr : not-expr ["AND" and-expr]
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;not-expr : ["NOT"] compare-expr
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;compare-expr : term [("=" | "<>" | "><" | ">" | ">=" | "<" | "<=") compare-expr]
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expr : term [("=" | "<>" | "><" | ">" | ">=" | "<" | "<=") expr]
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term : factor [("+" | "-") term]
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factor : value [("*" | "/") factor]
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;negate-expr : ["-"] power-expr
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;power-expr : [power-expr "^"] value
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value : "(" expr ")"
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| ID ["(" expr-list ")"]
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| datum
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datum : INTEGER | STRING | REAL
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@ -1,16 +1,3 @@
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#lang br/demo/basic
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10 PRINT TAB(30);"SINE WAVE"
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20 PRINT TAB(15);"CREATIVE COMPUTING MORRISTOWN, NEW JERSEY"
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30 PRINT: PRINT: PRINT: PRINT: PRINT
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50 B=0
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110 FOR T=0 TO 40 STEP .25
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120 A=INT(26+25*SIN(T))
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130 PRINT TAB(A);
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140 IF B=1 THEN 180
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150 PRINT "CREATIVE"
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160 B=1
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170 GOTO 200
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180 PRINT "COMPUTING"
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190 B=0
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200 NEXT T
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999 END
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@ -9,18 +9,26 @@
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(define (next-token)
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(define get-token
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(lexer
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[(repetition 1 +inf.0 "\n") (token 'CR '(CR))]
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[(union "PRINT" "FOR" "TO" "STEP" "IF" "THEN" "GOTO" "REM"
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[(:seq "REM" (repetition 1 +inf.0 (char-complement "\n")))
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(token 'REM-COMMENT (format-datum '(comment "~v") lexeme))]
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[(repetition 1 +inf.0 "\n") (token 'CR "cr")]
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[(union "PRINT" "FOR" "TO" "STEP" "IF" "THEN" "GOTO"
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"INPUT" "LET" "NEXT" "GOSUB" "RETURN"
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"CLEAR" "LIST" "RUN" "END") (string->symbol lexeme)]
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;; this only matches integers
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[(repetition 1 +inf.0 numeric) (token 'INTEGER (string->number lexeme))]
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[(repetition 1 +inf.0 (union "." numeric)) (token 'REAL (string->number lexeme))]
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[(union "," ";" ":" "+" "-" "*" "/"
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"<=" ">=" "<>" "><" "<" ">" "=" "(" ")") lexeme]
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[(:seq (repetition 1 +inf.0 upper-case)) (token 'ID lexeme)]
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[upper-case (token 'UPPERCASE lexeme)]
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;; things that get thrown out: pass through as strings,
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;; because they can be matched literally in macros.
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;; things that become identifiers: pass through as symbols,
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;; so they can get bound by the expander.
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[(union "," ":") (token 'SEPARATOR lexeme #:skip? #t)]
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[(union ";" "=" "(" ")") lexeme]
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[(union "+" "-" "*" "/"
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"<=" ">=" "<>" "><" "<" ">" "=" ) (string->symbol lexeme)]
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[(:seq (repetition 1 +inf.0 upper-case)) (token 'ID (string->symbol lexeme))]
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[upper-case (token 'UPPERCASE (string->symbol lexeme))]
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[whitespace (token 'WHITESPACE lexeme #:skip? #t)]
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[(:seq "\"" (complement (:: any-string "\"" any-string)) "\"") (token 'STRING (string-trim lexeme "\""))]
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[(eof) eof]))
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