fix loop termination
parent
e42afcd5df
commit
ff415bb42c
@ -1,87 +0,0 @@
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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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@ -1,61 +0,0 @@
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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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