Syntax-rules macroes can now capture variables and use them in the template. Ellipsis not implemented yet.
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example.scm
129
example.scm
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@ -3,6 +3,10 @@
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;;; Standard lib, in scheme
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; TODO: Fix below
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(define eq? eqv?)
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(define equal? eqv?)
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; Lists
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(define (foldl f i l)
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@ -37,6 +41,30 @@
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x
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(list-tail (cdr x) (- k 1)))))
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(define generic-member
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(lambda (compare obj ls)
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(if (null? ls)
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#f
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(if (compare obj (car ls))
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ls
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(generic-member compare obj (cdr ls))))))
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(define (memq obj ls) (generic-member eq? obj ls))
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(define (memv obj ls) (generic-member eqv? obj ls))
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(define (member obj ls) (generic-member equal? obj ls))
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(define (generic-assoc compare key als)
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(if (null? als)
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#f
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(if (compare key (caar als))
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(cdr (car als))
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(generic-assoc compare key (cdr als)))))
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(define (assq obj ls) (generic-assoc eq? obj ls))
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(define (assv obj ls) (generic-assoc eqv? obj ls))
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(define (assoc obj ls) (generic-assoc equal? obj ls))
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; Math
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@ -379,32 +407,86 @@
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(header "Testing syntax-rules (move to macro once implemented)")
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(define equal? eqv?)
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(define construct-pattern-predicate
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(lambda (name pat)
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(if (if (symbol? pat) #t (number? pat))
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(lambda (name pat literals)
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(if (number? pat)
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`(equal? ,name ,pat)
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; Is symbol
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(if (symbol? pat)
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(if (member pat literals)
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; Is literal
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`(equal? ,name ',pat)
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; Or is variable binding
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#t)
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(if (null? pat)
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`(null? ,name)
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(if (pair? pat)
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`(if (pair? ,name)
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(if ,(construct-pattern-predicate `(car ,name) (car pat))
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,(construct-pattern-predicate `(cdr ,name) (cdr pat))
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(if ,(construct-pattern-predicate `(car ,name)
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(car pat)
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literals)
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,(construct-pattern-predicate `(cdr ,name)
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(cdr pat)
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literals)
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#f)
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#f)
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'fuck )))))
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'fuck ))))))
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(define (find-variable-bindings literals path pattern)
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; Is symbol
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(if (if (symbol? pattern) (not (member pattern literals)) #f)
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`((,pattern ,path))
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; Is pair
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(if (pair? pattern)
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(append (find-variable-bindings literals `(car ,path) (car pattern))
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(find-variable-bindings literals `(cdr ,path) (cdr pattern)))
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; Is anything else
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; TODO: Vector patterns
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'() )))
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(define (construct-result bindings template)
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; Is symbol
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(if (if (symbol? template) (assoc template bindings) #f)
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(cons 'unquote (cons template '()))
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; Is pair
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(if (pair? template)
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(cons (construct-result bindings (car template))
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(construct-result bindings (cdr template)))
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; Is anything else
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; TODO: Vector patterns
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template )))
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(define syntax-rules-rec
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(lambda (macro-name var-name rules)
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(lambda (macro-name var-name literals rules)
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(if (null? rules)
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'doublefuck
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(let ((pattern (caar rules))
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(result (cadar rules)))
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(result (cadar rules))
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(bindings (find-variable-bindings literals var-name (caar rules)))
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)
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(if (eqv? macro-name (car pattern))
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`(if ,(construct-pattern-predicate var-name pattern)
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',result
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,(syntax-rules-rec macro-name var-name (cdr rules)))
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`(if ,(construct-pattern-predicate var-name
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pattern
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literals )
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(let ,bindings
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,(let ((sefijoesfeji (construct-result bindings result)))
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(begin (display "Mjerf: ")
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(display sefijoesfeji)
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(newline)
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(cons 'quasiquote (cons sefijoesfeji '()))))
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)
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,(syntax-rules-rec macro-name var-name literals (cdr rules)))
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(begin (display "Incorrect usage of syntax-rules-rec: Each rule must have same first symbol.")
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(display "\n\tFirst had ")
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@ -417,19 +499,16 @@
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(define-syntax syntax-rules
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(lambda (vo)
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(let ((literals (cadr vo))
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(let ((literals (cons (car (caaddr vo)) (cadr vo)))
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(rules (cddr vo))
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(name (car (caaddr vo))))
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`(lambda (vo2)
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,( syntax-rules-rec name 'vo2 rules))
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,( syntax-rules-rec name 'vo2 literals rules ))
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)))
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; Define true
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(syntax-rules ()
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((name ...) ...))
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(define-syntax true
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(syntax-rules ()
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((true) #t)))
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@ -464,7 +543,7 @@
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))
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(define-syntax derp
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(syntax-rules ()
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(syntax-rules (two)
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((derp) 1)
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((derp two) (+ (derp) (derp)))
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))
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@ -475,6 +554,20 @@
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( 2 . ,(derp two))
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))
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(define-syntax +1
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(syntax-rules ()
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((+1 n) (+ 1 n))))
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(test "Defining +1 using syntax-rules."
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`(
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( 6 . ,(+1 5))
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( 1 . ,(+1 0))
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( 0 . ,(+1 -1))
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))
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(exit)
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;;;;; ;
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(exit)
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@ -9,6 +9,9 @@ let /* Booleans */
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var IS_NIL_TRUTHY : bool := false
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var HAS_NIL_SYMBOL : bool := false
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var ALLOW_TAPE_RESIZE : bool := true
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var ASSUME_NO_OVERWRITE_STDLIB : bool := true
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var DEBUG_PRINT_STACK : bool := false
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var DEBUG_PRINT_TAPE : bool := false
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var DEBUG_PRINT_PARSED : bool := false
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@ -16,8 +19,6 @@ let /* Booleans */
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var DEBUG_PRINT_MACRO : bool := true
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var DEBUG_SHOW_FULL_ENVIRONMENT : bool := false
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var ALLOW_TAPE_RESIZE : bool := true
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var TRIGGERED_EXIT : bool := false
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/* Basic utility */
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@ -2031,7 +2032,9 @@ let /* Booleans */
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; /* TODO: Assert that there is something on the stack */
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derp := stack_pop(stack)
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; if DEBUG_PRINT_MACRO
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then ( print("Macro expanded to: ")
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then ( print("Macro \"")
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; print(ast.val_car.val_s )
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; print("\" expanded to: ")
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; print(value_to_string(derp))
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; print("\n") )
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; compile_rec(derp, can_tail_call, type_any)
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