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88 lines
2.7 KiB
Racket
88 lines
2.7 KiB
Racket
#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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