2238 lines
110 KiB
Racket
2238 lines
110 KiB
Racket
#lang scheme/base
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(require "matcher.ss"
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"struct.ss"
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"term.ss"
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"fresh.ss"
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"loc-wrapper.ss"
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"error.ss"
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mzlib/trace
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(lib "list.ss")
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(lib "etc.ss")
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(for-syntax syntax/parse))
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(require (for-syntax (lib "name.ss" "syntax")
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"loc-wrapper-ct.ss"
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"rewrite-side-conditions.ss"
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"term-fn.ss"
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"underscore-allowed.ss"
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(lib "boundmap.ss" "syntax")
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scheme/base
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(prefix-in pattern- scheme/match)))
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(define (language-nts lang)
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(hash-map (compiled-lang-ht lang) (λ (x y) x)))
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(define-for-syntax (prune-syntax stx)
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(datum->syntax
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(identifier-prune-lexical-context #'whatever '(#%app #%datum))
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(let loop ([stx stx])
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(syntax-case stx ()
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[(a . b)
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(datum->syntax (identifier-prune-lexical-context #'whatever '(#%app))
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(cons (loop #'a) (loop #'b))
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stx)]
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[x
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(identifier? #'x)
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(identifier-prune-lexical-context #'x)]
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[() (datum->syntax #f '() stx)]
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[_ (datum->syntax (identifier-prune-lexical-context #'whatever '(#%datum))
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(syntax->datum stx) stx)]))))
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(define-syntax (term-match/single stx)
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(syntax-case stx ()
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[(_ lang [pattern rhs] ...)
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(begin
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(unless (identifier? #'lang)
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(raise-syntax-error 'term-match/single "expected an identifier in the language position" stx #'lang))
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(let ([lang-nts (language-id-nts #'lang 'term-match/single)])
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(with-syntax ([(((names ...) (names/ellipses ...)) ...)
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(map (λ (x) (let-values ([(names names/ellipses) (extract-names lang-nts 'term-match/single #t x)])
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(list names names/ellipses)))
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(syntax->list (syntax (pattern ...))))]
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[(side-conditions-rewritten ...)
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(map (λ (x) (rewrite-side-conditions/check-errs lang-nts 'term-match #t x))
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(syntax->list (syntax (pattern ...))))]
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[(cp-x ...) (generate-temporaries #'(pattern ...))])
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#'(let ([lang-x lang])
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(let ([cp-x (compile-pattern lang-x `side-conditions-rewritten #t)] ...)
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(λ (exp)
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((let/ec k
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(let ([match (match-pattern cp-x exp)])
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(when match
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(unless (null? (cdr match))
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(redex-error
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'term-match/single
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"pattern ~s matched term ~e multiple ways"
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'pattern
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exp))
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(k (λ ()
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(term-let/error-name
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term-match/single
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([names/ellipses (lookup-binding (mtch-bindings (car match)) 'names)] ...)
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rhs)))))
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...
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(redex-error 'term-match/single "no patterns matched ~e" exp)))))))))]))
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(define-syntax (term-match stx)
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(syntax-case stx ()
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[(_ lang [pattern rhs] ...)
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(begin
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(unless (identifier? #'lang)
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(raise-syntax-error 'term-match "expected an identifier" stx #'lang))
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(let ([lang-nts (language-id-nts #'lang 'term-match)])
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(with-syntax ([(((names ...) (names/ellipses ...)) ...)
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(map (λ (x) (let-values ([(names names/ellipses) (extract-names lang-nts 'term-match #t x)])
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(list names names/ellipses)))
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(syntax->list (syntax (pattern ...))))]
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[(side-conditions-rewritten ...)
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(map (λ (x) (rewrite-side-conditions/check-errs lang-nts 'term-match #t x))
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(syntax->list (syntax (pattern ...))))]
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[(cp-x ...) (generate-temporaries #'(pattern ...))])
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#'(let ([lang-x lang])
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(let ([cp-x (compile-pattern lang-x `side-conditions-rewritten #t)] ...)
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(λ (exp)
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(append
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(let ([matches (match-pattern cp-x exp)])
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(if matches
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(map (λ (match)
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(term-let/error-name
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term-match
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([names/ellipses (lookup-binding (mtch-bindings match) 'names)] ...)
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rhs))
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matches)
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'())) ...)))))))]))
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(define-syntax (compatible-closure stx)
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(syntax-case stx ()
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[(_ red lang nt)
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(identifier? (syntax nt))
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(with-syntax ([side-conditions-rewritten
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(rewrite-side-conditions/check-errs (language-id-nts #'lang 'compatible-closure)
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'compatible-closure
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#t
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(syntax (cross nt)))])
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(syntax (do-context-closure red lang `side-conditions-rewritten 'compatible-closure)))]
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[(_ red lang nt)
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(raise-syntax-error 'compatible-closure "expected a non-terminal as last argument" stx (syntax nt))]))
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(define-syntax (context-closure stx)
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(syntax-case stx ()
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[(_ red lang pattern)
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(with-syntax ([side-conditions-rewritten
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(rewrite-side-conditions/check-errs (language-id-nts #'lang 'context-closure)
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'context-closure
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#t
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(syntax pattern))])
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(syntax
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(do-context-closure
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red
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lang
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`side-conditions-rewritten
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'context-closure)))]))
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(define (do-context-closure red lang pat name)
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(unless (reduction-relation? red)
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(error name "expected <reduction-relation> as first argument, got ~e" red))
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(unless (compiled-lang? lang)
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(error name "expected <lang> as second argument, got ~e" lang))
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(let ([cp (compile-pattern
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lang
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`(in-hole (name ctxt ,pat)
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(name exp any))
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#f)])
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(build-reduction-relation
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#f
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lang
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(map
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(λ (make-proc)
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(make-rewrite-proc
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(λ (lang)
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(let ([f (make-proc lang)])
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(λ (main-exp exp extend acc)
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(let loop ([ms (or (match-pattern cp exp) '())]
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[acc acc])
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(cond
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[(null? ms) acc]
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[else
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(let* ([mtch (car ms)]
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[bindings (mtch-bindings mtch)])
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(loop (cdr ms)
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(f main-exp
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(lookup-binding bindings 'exp)
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(λ (x) (extend (plug (lookup-binding bindings 'ctxt) x)))
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acc)))])))))
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(rewrite-proc-name make-proc)
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(rewrite-proc-lhs make-proc)
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(rewrite-proc-lhs-src make-proc)
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(rewrite-proc-id make-proc)))
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(reduction-relation-make-procs red))
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(reduction-relation-rule-names red)
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(reduction-relation-lws red)
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`any)))
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(define-syntax (--> stx) (raise-syntax-error '--> "used outside of reduction-relation"))
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(define-syntax (fresh stx) (raise-syntax-error 'fresh "used outside of reduction-relation"))
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(define-syntax (with stx) (raise-syntax-error 'with "used outside of reduction-relation"))
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(define (apply-reduction-relation/tag-with-names p v)
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(let loop ([procs (reduction-relation-procs p)]
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[acc '()])
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(cond
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[(null? procs) acc]
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[else
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(loop (cdr procs)
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((car procs) v v values acc))])))
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(define (apply-reduction-relation p v) (map cadr (apply-reduction-relation/tag-with-names p v)))
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(define-for-syntax (extract-pattern-binds lhs)
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(let loop ([lhs lhs])
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(syntax-case* lhs (name) (lambda (a b) (eq? (syntax-e a) (syntax-e b)))
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[(name id expr)
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(identifier? #'id)
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(cons (cons #'id #'expr) (loop #'expr))]
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;; FIXME: should follow the grammar of patterns!
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[(a . b)
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(append (loop #'a) (loop #'b))]
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[_else null])))
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(define-for-syntax (extract-term-let-binds lhs)
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(let loop ([lhs lhs])
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(syntax-case* lhs (term-let) (lambda (a b) (eq? (syntax-e a) (syntax-e b)))
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[(term-let ((x e1) ...) e2 ...)
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(append (map cons
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(syntax->list #'(x ...))
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(syntax->list #'(e1 ...)))
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(loop #'(e2 ...)))]
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;; FIXME: should follow the grammar of patterns!
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[(a . b)
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(append (loop #'a) (loop #'b))]
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[_else null])))
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(define-syntax (-reduction-relation stx)
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(syntax-case stx ()
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[(_ lang args ...)
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(with-syntax ([orig-stx stx])
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(syntax/loc stx (do-reduction-relation orig-stx reduction-relation empty-reduction-relation #f lang args ...)))]))
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(define-syntax (extend-reduction-relation stx)
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(syntax-case stx ()
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[(_ orig-reduction-relation lang args ...)
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(with-syntax ([orig-stx stx])
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(syntax/loc stx (do-reduction-relation orig-stx extend-reduction-relation orig-reduction-relation #t lang args ...)))]))
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;; the withs, freshs, and side-conditions come in backwards order
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(define-for-syntax (bind-withs orig-name main lang lang-nts stx where-mode body)
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(let* ([bindings '()]
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[body
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(let loop ([stx stx]
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[to-not-be-in main])
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(syntax-case stx (fresh)
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[() body]
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[((-where x e) y ...)
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(or (free-identifier=? #'-where #'where)
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(free-identifier=? #'-where #'where/hidden))
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(let-values ([(names names/ellipses) (extract-names lang-nts 'reduction-relation #t #'x)])
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(with-syntax ([(cpat) (generate-temporaries '(compiled-pattern))]
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[side-conditions-rewritten (rewrite-side-conditions/check-errs
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lang-nts
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'reduction-relation
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#f
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#'x)]
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[(names ...) names]
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[(names/ellipses ...) names/ellipses])
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(with-syntax ([(x ...) (generate-temporaries #'(names ...))])
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(set! bindings (cons #`[cpat (compile-pattern #,lang `side-conditions-rewritten #t)] bindings))
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(let ([rest-body (loop #'(y ...) #`(list x ... #,to-not-be-in))])
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#`(let ([mtchs (match-pattern cpat (term e))])
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(if mtchs
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#,
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(case where-mode
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[(flatten)
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#`(apply
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append
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(map (λ (mtch)
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(let ([bindings (mtch-bindings mtch)])
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(let ([x (lookup-binding bindings 'names)] ...)
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(term-let ([names/ellipses x] ...)
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#,rest-body))))
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mtchs))]
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[(predicate)
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#`(ormap (λ (mtch)
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(let ([bindings (mtch-bindings mtch)])
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(let ([x (lookup-binding bindings 'names)] ...)
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(term-let ([names/ellipses x] ...)
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#,rest-body))))
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mtchs)]
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[else (error 'unknown-where-mode "~s" where-mode)])
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#f))))))]
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[((-side-condition s ...) y ...)
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(or (free-identifier=? #'-side-condition #'side-condition)
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(free-identifier=? #'-side-condition #'side-condition/hidden))
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#`(and s ... #,(loop #'(y ...) to-not-be-in))]
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[((fresh x) y ...)
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(identifier? #'x)
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#`(term-let ([x (variable-not-in #,to-not-be-in 'x)])
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#,(loop #'(y ...) #`(list (term x) #,to-not-be-in)))]
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[((fresh x name) y ...)
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(identifier? #'x)
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#`(term-let ([x (let ([the-name (term name)])
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(verify-name-ok '#,orig-name the-name)
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(variable-not-in #,to-not-be-in the-name))])
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#,(loop #'(y ...) #`(list (term x) #,to-not-be-in)))]
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[((fresh (y) (x ...)) z ...)
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#`(term-let ([(y #,'...)
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(variables-not-in #,to-not-be-in
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(map (λ (_ignore_) 'y)
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(term (x ...))))])
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#,(loop #'(z ...) #`(list (term (y #,'...)) #,to-not-be-in)))]
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[((fresh (y) (x ...) names) z ...)
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#`(term-let ([(y #,'...)
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(let ([the-names (term names)]
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[len-counter (term (x ...))])
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(verify-names-ok '#,orig-name the-names len-counter)
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(variables-not-in #,to-not-be-in the-names))])
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#,(loop #'(z ...) #`(list (term (y #,'...)) #,to-not-be-in)))]))])
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(values body bindings)))
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(define-syntax-set (do-reduction-relation)
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(define (do-reduction-relation/proc stx)
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(syntax-case stx ()
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[(_ orig-stx id orig-reduction-relation allow-zero-rules? lang . w/domain-args)
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(identifier? #'lang)
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(prune-syntax
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(let-values ([(domain-pattern main-arrow args)
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(parse-keywords #'orig-stx #'id #'w/domain-args)])
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(with-syntax ([(rules ...) (before-with args)]
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[(shortcuts ...) (after-with args)])
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(with-syntax ([(lws ...) (map rule->lws (syntax->list #'(rules ...)))])
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(reduction-relation/helper
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#'orig-stx
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(syntax-e #'id)
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#'orig-reduction-relation
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(syntax lang)
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(syntax->list (syntax (rules ...)))
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(syntax->list (syntax (shortcuts ...)))
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#'(list lws ...)
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(syntax-e #'allow-zero-rules?)
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domain-pattern
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main-arrow)))))]
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[(_ orig-stx id orig-reduction-relation allow-zero-rules? lang args ...)
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(raise-syntax-error (syntax-e #'id)
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"expected an identifier for the language name"
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#'lang)]))
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(define default-arrow #'-->)
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(define (parse-keywords stx id args)
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(let ([domain-contract #'any]
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[main-arrow default-arrow])
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;; ensure no duplicate keywords
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(let ([ht (make-hash)]
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[known-keywords '(#:arrow #:domain)]) ;; #:arrow not yet implemented
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(for-each (λ (kwd/stx) ;; (not necc a keyword)
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(let ([kwd (syntax-e kwd/stx)])
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(when (keyword? kwd)
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(unless (member kwd known-keywords)
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(raise-syntax-error (syntax-e id)
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"unknown keyword"
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stx
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kwd/stx))
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(when (hash-ref ht kwd #f)
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(raise-syntax-error (syntax-e id)
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"duplicate keywords"
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stx
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kwd/stx
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(list (hash-ref ht kwd))))
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(hash-set! ht kwd kwd/stx))))
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(syntax->list args)))
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(let loop ([args args])
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(syntax-case args ()
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[(#:domain pat args ...)
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(begin (set! domain-contract #'pat)
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(loop #'(args ...)))]
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[(#:domain)
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(raise-syntax-error (syntax-e id)
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"expected a domain after #:domain"
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stx)]
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[(#:arrow arrow . args)
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(identifier? #'arrow)
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(begin (set! main-arrow #'arrow)
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(loop #'args))]
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[(#:arrow arrow . args)
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(raise-syntax-error (syntax-e id)
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"expected an arrow after #:arrow, not a compound expression"
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stx
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#'arrow)]
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[(#:arrow)
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(raise-syntax-error (syntax-e id)
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"expected an arrow after #:arrow"
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stx)]
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[_
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(begin
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(values domain-contract main-arrow args))]))))
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(define (before-with stx)
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(let loop ([lst (syntax->list stx)])
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(cond
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[(null? lst) null]
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[else
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(let ([fst (car lst)])
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(syntax-case (car lst) (with)
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[with null]
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[else (cons (car lst) (loop (cdr lst)))]))])))
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(define (after-with stx)
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(let loop ([lst (syntax->list stx)])
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(cond
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[(null? lst) null]
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[else
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(let ([fst (car lst)])
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(syntax-case (car lst) (with)
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[with (cdr lst)]
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[else (loop (cdr lst))]))])))
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(define (rule->lws rule)
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(syntax-case rule ()
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[(arrow lhs rhs stuff ...)
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(let-values ([(label scs/withs fvars)
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(let loop ([stuffs (syntax->list #'(stuff ...))]
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[label #f]
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[scs/withs null]
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[fvars null])
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(cond
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[(null? stuffs) (values label (reverse scs/withs) (reverse fvars))]
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[else
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(syntax-case (car stuffs) (where where/hidden
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side-condition side-condition/hidden
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|
fresh variable-not-in)
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[(fresh xs ...)
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(loop (cdr stuffs)
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label
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scs/withs
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(append
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(reverse (map (λ (x)
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(to-lw/proc
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(syntax-case x ()
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[x
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(identifier? #'x)
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#'x]
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[(x whatever)
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(identifier? #'x)
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#'x]
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[((y dots) (x dots2))
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(datum->syntax
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#f
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`(,(syntax->datum #'y) ...)
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#'y)]
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[((y dots) (x dots2) whatever)
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(datum->syntax
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#f
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`(,(syntax->datum #'y) ...)
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#'y)])))
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(syntax->list #'(xs ...))))
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fvars))]
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[(where x e)
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(loop (cdr stuffs)
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label
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(cons #`(cons #,(to-lw/proc #'x) #,(to-lw/proc #'e))
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scs/withs)
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fvars)]
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[(where/hidden x e)
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(loop (cdr stuffs) label scs/withs fvars)]
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[(side-condition sc)
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(loop (cdr stuffs)
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label
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(cons (to-lw/uq/proc #'sc) scs/withs)
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fvars)]
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[(side-condition/hidden sc)
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(loop (cdr stuffs) label scs/withs fvars)]
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[x
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(identifier? #'x)
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(loop (cdr stuffs)
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#''x
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scs/withs
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fvars)]
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[x
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(string? (syntax-e #'x))
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(loop (cdr stuffs)
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#'x
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scs/withs
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fvars)])]))])
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|
(with-syntax ([(scs/withs ...) scs/withs]
|
|
[(fvars ...) fvars]
|
|
[((bind-id . bind-pat) ...)
|
|
(extract-pattern-binds #'lhs)]
|
|
[((tl-id . tl-pat) ...)
|
|
(extract-term-let-binds #'rhs)])
|
|
#`(make-rule-pict 'arrow
|
|
#,(to-lw/proc #'lhs)
|
|
#,(to-lw/proc #'rhs)
|
|
#,label
|
|
(list scs/withs ...
|
|
#,@(map (λ (bind-id bind-pat)
|
|
#`(cons #,(to-lw/proc bind-id)
|
|
#,(to-lw/proc bind-pat)))
|
|
(syntax->list #'(bind-id ...))
|
|
(syntax->list #'(bind-pat ...)))
|
|
#,@(map (λ (tl-id tl-pat)
|
|
#`(cons #,(to-lw/proc tl-id)
|
|
#,(to-lw/uq/proc tl-pat)))
|
|
(syntax->list #'(tl-id ...))
|
|
(syntax->list #'(tl-pat ...))))
|
|
(list fvars ...))))]))
|
|
|
|
(define (reduction-relation/helper stx orig-name orig-red-expr lang-id rules shortcuts
|
|
lws
|
|
allow-zero-rules?
|
|
domain-pattern
|
|
main-arrow)
|
|
(let ([ht (make-module-identifier-mapping)]
|
|
[all-top-levels '()]
|
|
[withs (make-module-identifier-mapping)])
|
|
(for-each (λ (shortcut)
|
|
(syntax-case shortcut ()
|
|
[((rhs-arrow rhs-from rhs-to)
|
|
(lhs-arrow a b))
|
|
(not (identifier? #'a))
|
|
(raise-syntax-error
|
|
orig-name
|
|
"malformed shortcut, expected identifier"
|
|
shortcut #'a)]
|
|
[((rhs-arrow rhs-from rhs-to)
|
|
(lhs-arrow a b))
|
|
(not (identifier? #'b))
|
|
(raise-syntax-error
|
|
orig-name
|
|
"malformed shortcut, expected identifier"
|
|
shortcut #'b)]
|
|
[((rhs-arrow rhs-from rhs-to)
|
|
(lhs-arrow lhs-from lhs-to))
|
|
(begin
|
|
(table-cons! withs #'lhs-arrow #'rhs-arrow)
|
|
(table-cons! ht (syntax rhs-arrow) shortcut))]
|
|
[((a b c) d)
|
|
(raise-syntax-error
|
|
orig-name
|
|
"malformed shortcut, expected right-hand side to have three sub-expressions"
|
|
stx (syntax d))]
|
|
[(a b)
|
|
(raise-syntax-error
|
|
orig-name
|
|
"malformed shortcut, expected left-hand side to have three sub-expressions"
|
|
stx (syntax a))]
|
|
[(a b c d ...)
|
|
(raise-syntax-error orig-name
|
|
"malformed shortcut, expected only two subparts for a shortcut definition, found an extra one"
|
|
stx
|
|
(syntax c))]
|
|
[_ (raise-syntax-error orig-name
|
|
"malformed shortcut"
|
|
stx shortcut)]))
|
|
shortcuts)
|
|
|
|
(for-each (λ (rule)
|
|
(syntax-case rule ()
|
|
[(arrow . rst)
|
|
(begin
|
|
(set! all-top-levels (cons #'arrow all-top-levels))
|
|
(table-cons! ht (syntax arrow) rule))]))
|
|
rules)
|
|
|
|
;; signal a syntax error if there are shortcuts defined, but no rules that use them
|
|
(unless (null? shortcuts)
|
|
(unless (module-identifier-mapping-get ht main-arrow (λ () #f))
|
|
(raise-syntax-error orig-name
|
|
(format "no ~a rules" (syntax-e main-arrow))
|
|
stx)))
|
|
|
|
(for-each (λ (tl)
|
|
(let loop ([id tl])
|
|
(unless (free-identifier=? main-arrow id)
|
|
(let ([nexts
|
|
(module-identifier-mapping-get
|
|
withs id
|
|
(λ ()
|
|
(raise-syntax-error
|
|
orig-name
|
|
(format "the ~s relation is not defined"
|
|
(syntax->datum id))
|
|
stx
|
|
id)))])
|
|
(for-each loop nexts)))))
|
|
all-top-levels)
|
|
|
|
(let ([name-table (make-hasheq)]
|
|
[lang-nts (language-id-nts lang-id orig-name)])
|
|
(hash-set! name-table #f 0)
|
|
;; name table maps symbols for the rule names to their syntax objects and to a counter indicating what
|
|
;; order the names were encountered in. The current value of the counter is stored in the table at key '#f'.
|
|
(with-syntax ([lang-id lang-id]
|
|
[(top-level ...) (get-choices stx orig-name ht lang-id main-arrow
|
|
name-table lang-id allow-zero-rules?)]
|
|
[(rule-names ...)
|
|
(begin
|
|
(hash-remove! name-table #f)
|
|
(map car (sort (hash-map name-table (λ (k v) (list k (list-ref v 1)))) < #:key cadr)))]
|
|
[lws lws]
|
|
|
|
[domain-pattern-side-conditions-rewritten
|
|
(rewrite-side-conditions/check-errs
|
|
lang-nts
|
|
orig-name
|
|
#f
|
|
domain-pattern)])
|
|
|
|
#`(build-reduction-relation
|
|
#,orig-red-expr
|
|
lang-id
|
|
(list top-level ...)
|
|
'(rule-names ...)
|
|
lws
|
|
`domain-pattern-side-conditions-rewritten)))))
|
|
|
|
#|
|
|
;; relation-tree =
|
|
;; leaf
|
|
;; (make-node id[frm] pat[frm] id[to] pat[to] (listof relation-tree))
|
|
(define-struct node (frm-id frm-pat to-id to-pat))
|
|
(define-struct leaf (frm-pat to-pat))
|
|
|#
|
|
;; get-choices : stx[original-syntax-object] bm lang identifier ht[sym->syntax] identifier[language-name] -> (listof relation-tree)
|
|
(define (get-choices stx orig-name bm lang id name-table lang-id allow-zero-rules?)
|
|
(reverse
|
|
(apply
|
|
append
|
|
(map (λ (x) (get-tree stx orig-name bm lang x name-table lang-id allow-zero-rules?))
|
|
(module-identifier-mapping-get
|
|
bm id
|
|
(λ ()
|
|
(if allow-zero-rules?
|
|
'()
|
|
(raise-syntax-error orig-name
|
|
(format "no rules use ~a" (syntax->datum id))
|
|
stx
|
|
(if (equal? id default-arrow) #f id)))))))))
|
|
|
|
(define (get-tree stx orig-name bm lang case-stx name-table lang-id allow-zero-rules?)
|
|
(syntax-case case-stx ()
|
|
[(arrow from to extras ...)
|
|
(list (do-leaf stx
|
|
orig-name
|
|
lang
|
|
name-table
|
|
(syntax from)
|
|
(syntax to)
|
|
(syntax->list (syntax (extras ...)))
|
|
lang-id))]
|
|
[((rhs-arrow rhs-from rhs-to) (lhs-arrow lhs-frm-id lhs-to-id))
|
|
(let* ([lang-nts (language-id-nts lang-id orig-name)]
|
|
[rewrite-side-conds
|
|
(λ (pat) (rewrite-side-conditions/check-errs lang-nts orig-name #t pat))])
|
|
(let-values ([(names names/ellipses) (extract-names lang-nts orig-name #t (syntax rhs-from))])
|
|
(with-syntax ([(names ...) names]
|
|
[(names/ellipses ...) names/ellipses]
|
|
[side-conditions-rewritten (rewrite-side-conds
|
|
(rewrite-node-pat (syntax-e (syntax lhs-frm-id))
|
|
(syntax rhs-from)))]
|
|
[fresh-rhs-from (rewrite-side-conds
|
|
(freshen-names #'rhs-from #'lhs-frm-id lang-nts orig-name))]
|
|
[lang lang])
|
|
(map
|
|
(λ (child-proc)
|
|
#`(do-node-match
|
|
'lhs-frm-id
|
|
'lhs-to-id
|
|
`side-conditions-rewritten
|
|
(λ (bindings rhs-binder)
|
|
(term-let ([lhs-to-id rhs-binder]
|
|
[names/ellipses (lookup-binding bindings 'names)] ...)
|
|
(term rhs-to)))
|
|
#,child-proc
|
|
`fresh-rhs-from))
|
|
(get-choices stx orig-name bm #'lang
|
|
(syntax lhs-arrow)
|
|
name-table lang-id
|
|
allow-zero-rules?)))))]))
|
|
(define (rewrite-node-pat id term)
|
|
(let loop ([t term])
|
|
(syntax-case t (side-condition)
|
|
[(side-condition p c)
|
|
#`(side-condition #,(loop #'p) c)]
|
|
[(p ...)
|
|
(map loop (syntax->list #'(p ...)))]
|
|
[else
|
|
(if (and (identifier? t) (eq? id (syntax-e t)))
|
|
`(name ,id any)
|
|
t)])))
|
|
|
|
(define (freshen-names pat hole-id nts what)
|
|
(define (fresh x)
|
|
(gensym
|
|
(if (or (memq x nts) (memq x underscore-allowed))
|
|
(string-append (symbol->string x) "_")
|
|
x)))
|
|
(let-values ([(bound _) (extract-names nts what #t pat #f)])
|
|
(let ([renames (make-bound-identifier-mapping)])
|
|
(for-each
|
|
(λ (x)
|
|
(unless (bound-identifier=? x hole-id)
|
|
(bound-identifier-mapping-put! renames x (fresh (syntax-e x)))))
|
|
bound)
|
|
(let recur ([p pat])
|
|
(syntax-case p (side-condition)
|
|
[(side-condition p c)
|
|
#`(side-condition
|
|
#,(recur #'p)
|
|
(term-let (#,@(bound-identifier-mapping-map renames (λ (x y) #`(#,x (term #,y)))))
|
|
c))]
|
|
[(p ...)
|
|
#`(#,@(map recur (syntax->list #'(p ...))))]
|
|
[else
|
|
(if (identifier? p)
|
|
(bound-identifier-mapping-get renames p (λ () p))
|
|
p)])))))
|
|
|
|
(define (do-leaf stx orig-name lang name-table from to extras lang-id)
|
|
(let* ([lang-nts (language-id-nts lang-id orig-name)]
|
|
[rw-sc (λ (pat) (rewrite-side-conditions/check-errs lang-nts orig-name #t pat))])
|
|
(let-values ([(name sides/withs/freshs) (process-extras stx orig-name name-table extras)])
|
|
(let-values ([(names names/ellipses) (extract-names lang-nts orig-name #t from)]
|
|
[(body-code compile-pattern-bindings)
|
|
(bind-withs orig-name
|
|
#'main-exp
|
|
lang
|
|
lang-nts
|
|
sides/withs/freshs
|
|
'flatten
|
|
#`(list (term #,to)))]
|
|
[(test-case-body-code test-case-compile-pattern-bindings)
|
|
;; this contains some redundant code, eg. the test-case-compile-pattern-bindings
|
|
;; are (morally) the same as the compile-pattern-bindings
|
|
(bind-withs orig-name
|
|
#'#t
|
|
#'lang-id2
|
|
lang-nts
|
|
sides/withs/freshs
|
|
'predicate
|
|
#'#t)])
|
|
(with-syntax ([side-conditions-rewritten (rw-sc from)]
|
|
[lhs-w/extras (rw-sc #`(side-condition #,from #,test-case-body-code))]
|
|
[lhs-source (format "~a:~a:~a"
|
|
(syntax-source from)
|
|
(syntax-line from)
|
|
(syntax-column from))]
|
|
[name name]
|
|
[lang lang]
|
|
[(names ...) names]
|
|
[(names/ellipses ...) names/ellipses]
|
|
[body-code body-code]
|
|
[(test-case-compile-pattern-bindings ...) test-case-compile-pattern-bindings]
|
|
[(compile-pattern-bindings ...) compile-pattern-bindings])
|
|
#`
|
|
(let ([case-id (gensym)])
|
|
(make-rewrite-proc
|
|
(λ (lang-id)
|
|
(let ([cp (compile-pattern lang-id `side-conditions-rewritten #t)]
|
|
compile-pattern-bindings ...)
|
|
(λ (main-exp exp f other-matches)
|
|
(let ([mtchs (match-pattern cp exp)])
|
|
(if mtchs
|
|
(let loop ([mtchs mtchs]
|
|
[acc other-matches])
|
|
(cond
|
|
[(null? mtchs) acc]
|
|
[else
|
|
(let* ([mtch (car mtchs)]
|
|
[bindings (mtch-bindings mtch)]
|
|
[really-matched
|
|
(term-let ([names/ellipses (lookup-binding bindings 'names)] ...)
|
|
body-code)])
|
|
(cond
|
|
[really-matched
|
|
(for-each
|
|
(λ (c)
|
|
(let ([r (coverage-relation c)])
|
|
(when (and (reduction-relation? r)
|
|
(memf (λ (r) (eq? case-id (rewrite-proc-id r)))
|
|
(reduction-relation-make-procs r)))
|
|
(cover-case case-id c))))
|
|
(relation-coverage))
|
|
(loop (cdr mtchs)
|
|
(map/mt (λ (x) (list name (f x))) really-matched acc))]
|
|
[else
|
|
(loop (cdr mtchs) acc)]))]))
|
|
other-matches)))))
|
|
name
|
|
(λ (lang-id2) (let (test-case-compile-pattern-bindings ...) `lhs-w/extras))
|
|
lhs-source
|
|
case-id)))))))
|
|
|
|
(define (process-extras stx orig-name name-table extras)
|
|
(let* ([the-name #f]
|
|
[the-name-stx #f]
|
|
[sides/withs/freshs
|
|
(let loop ([extras extras])
|
|
(cond
|
|
[(null? extras) '()]
|
|
[else
|
|
(syntax-case (car extras) (fresh)
|
|
[name
|
|
(or (identifier? (car extras))
|
|
(string? (syntax-e (car extras))))
|
|
(begin
|
|
(let* ([raw-name (syntax-e (car extras))]
|
|
[name-sym
|
|
(if (symbol? raw-name)
|
|
raw-name
|
|
(string->symbol raw-name))])
|
|
(when (hash-ref name-table name-sym #f)
|
|
(raise-syntax-errors orig-name
|
|
"same name on multiple rules"
|
|
stx
|
|
(list (car (hash-ref name-table name-sym))
|
|
(syntax name))))
|
|
(let ([num (hash-ref name-table #f)])
|
|
(hash-set! name-table #f (+ num 1))
|
|
(hash-set! name-table name-sym (list (syntax name) num)))
|
|
|
|
(when the-name
|
|
(raise-syntax-errors orig-name
|
|
"expected only a single name"
|
|
stx
|
|
(list the-name-stx (car extras))))
|
|
(set! the-name (if (symbol? raw-name)
|
|
(symbol->string raw-name)
|
|
raw-name))
|
|
(set! the-name-stx (car extras))
|
|
(loop (cdr extras))))]
|
|
[(fresh var ...)
|
|
(append (map (λ (x)
|
|
(syntax-case x ()
|
|
[x
|
|
(identifier? #'x)
|
|
#'(fresh x)]
|
|
[(x name)
|
|
(identifier? #'x)
|
|
#'(fresh x name)]
|
|
[((ys dots2) (xs dots1))
|
|
(and (eq? (syntax-e #'dots1) (string->symbol "..."))
|
|
(eq? (syntax-e #'dots2) (string->symbol "...")))
|
|
#'(fresh (ys) (xs dots1))]
|
|
[((ys dots2) (xs dots1) names)
|
|
(and (eq? (syntax-e #'dots1) (string->symbol "..."))
|
|
(eq? (syntax-e #'dots2) (string->symbol "...")))
|
|
#'(fresh (ys) (xs dots1) names)]
|
|
[x
|
|
(raise-syntax-error orig-name
|
|
"malformed fresh variable clause"
|
|
stx
|
|
#'x)]))
|
|
(syntax->list #'(var ...)))
|
|
(loop (cdr extras)))]
|
|
[(-side-condition exp ...)
|
|
(or (free-identifier=? #'-side-condition #'side-condition)
|
|
(free-identifier=? #'-side-condition #'side-condition/hidden))
|
|
(cons (car extras) (loop (cdr extras)))]
|
|
[(-where x e)
|
|
(or (free-identifier=? #'-where #'where)
|
|
(free-identifier=? #'-where #'where/hidden))
|
|
(cons (car extras) (loop (cdr extras)))]
|
|
[(-where . x)
|
|
(or (free-identifier=? #'-where #'where)
|
|
(free-identifier=? #'-where #'where/hidden))
|
|
(raise-syntax-error orig-name "malformed where clause" stx (car extras))]
|
|
[_
|
|
(raise-syntax-error orig-name "unknown extra" stx (car extras))])]))])
|
|
(values the-name sides/withs/freshs)))
|
|
|
|
|
|
|
|
;; table-cons! hash-table sym any -> void
|
|
;; extends ht at key by `cons'ing hd onto whatever is alrady bound to key (or the empty list, if nothing is)
|
|
(define (table-cons! ht key hd)
|
|
(module-identifier-mapping-put! ht key (cons hd (module-identifier-mapping-get ht key (λ () '())))))
|
|
|
|
(define (raise-syntax-errors sym str stx stxs)
|
|
(raise (make-exn:fail:syntax
|
|
(string->immutable-string (format "~a: ~a~a"
|
|
sym
|
|
str
|
|
(if (error-print-source-location)
|
|
(string-append ":" (stxs->list stxs))
|
|
"")))
|
|
(current-continuation-marks)
|
|
stxs)))
|
|
|
|
(define (stxs->list stxs)
|
|
(apply
|
|
string-append
|
|
(let loop ([stxs stxs])
|
|
(cond
|
|
[(null? stxs) '()]
|
|
[else
|
|
(cons (format " ~s" (syntax->datum (car stxs)))
|
|
(loop (cdr stxs)))])))))
|
|
|
|
(define (substitute from to pat)
|
|
(let recur ([p pat])
|
|
(syntax-case p (side-condition)
|
|
[(side-condition p c)
|
|
#`(side-condition #,(recur #'p) c)]
|
|
[(p ...)
|
|
#`(#,@(map recur (syntax->list #'(p ...))))]
|
|
[else
|
|
(if (and (identifier? p) (bound-identifier=? p from))
|
|
to
|
|
p)])))
|
|
|
|
(define (verify-name-ok orig-name the-name)
|
|
(unless (symbol? the-name)
|
|
(error orig-name "expected a single name, got ~s" the-name)))
|
|
|
|
(define (verify-names-ok orig-name the-names len-counter)
|
|
(unless (and (list? the-names)
|
|
(andmap symbol? the-names))
|
|
(error orig-name
|
|
"expected a sequence of names, got ~s"
|
|
the-names))
|
|
(unless (= (length len-counter)
|
|
(length the-names))
|
|
(error orig-name
|
|
"expected the length of the sequence of names to be ~a, got ~s"
|
|
(length len-counter)
|
|
the-names)))
|
|
|
|
(define (union-reduction-relations fst snd . rst)
|
|
(let ([name-ht (make-hasheq)]
|
|
[counter 0]
|
|
[lst (list* fst snd rst)]
|
|
[first-lang (reduction-relation-lang fst)])
|
|
(for-each
|
|
(λ (red)
|
|
(unless (eq? first-lang (reduction-relation-lang red))
|
|
(error 'union-reduction-relations
|
|
"expected all of the reduction relations to use the same language"))
|
|
(for-each (λ (name)
|
|
(when (hash-ref name-ht name #f)
|
|
(error 'union-reduction-relations "multiple rules with the name ~s" name))
|
|
(hash-set! name-ht name counter)
|
|
(set! counter (+ counter 1)))
|
|
(reduction-relation-rule-names red)))
|
|
(reverse lst)) ;; reverse here so the names get put into the hash in the proper (backwards) order
|
|
(build-reduction-relation
|
|
#f
|
|
first-lang
|
|
(reverse (apply append (map reduction-relation-make-procs lst)))
|
|
(map car (sort (hash-map name-ht list) < #:key cadr))
|
|
(apply append (map reduction-relation-lws lst))
|
|
`any)))
|
|
|
|
(define (do-node-match lhs-frm-id lhs-to-id pat rhs-proc child-make-proc rhs-from)
|
|
(define (subst from to in)
|
|
(let recur ([p in])
|
|
(cond [(eq? from p) to]
|
|
[(pair? p) (map recur p)]
|
|
[else p])))
|
|
;; need call to make-rewrite-proc
|
|
;; also need a test case here to check duplication of names.
|
|
(make-rewrite-proc
|
|
(λ (lang)
|
|
(let ([cp (compile-pattern lang pat #t)]
|
|
[child-proc (child-make-proc lang)])
|
|
(λ (main-exp exp f other-matches)
|
|
(let ([mtchs (match-pattern cp exp)])
|
|
(if mtchs
|
|
(let o-loop ([mtchs mtchs]
|
|
[acc other-matches])
|
|
(cond
|
|
[(null? mtchs) acc]
|
|
[else
|
|
(let ([sub-exp (lookup-binding (mtch-bindings (car mtchs)) lhs-frm-id)])
|
|
(o-loop (cdr mtchs)
|
|
(child-proc main-exp
|
|
sub-exp
|
|
(λ (x) (f (rhs-proc (mtch-bindings (car mtchs)) x)))
|
|
acc)))]))
|
|
other-matches)))))
|
|
(rewrite-proc-name child-make-proc)
|
|
(λ (lang) (subst lhs-frm-id ((rewrite-proc-lhs child-make-proc) lang) rhs-from))
|
|
(rewrite-proc-lhs-src child-make-proc)
|
|
(rewrite-proc-id child-make-proc)))
|
|
|
|
(define relation-coverage (make-parameter null))
|
|
|
|
(define (cover-case id cov)
|
|
(hash-update! (coverage-counts cov) id
|
|
(λ (c) (cons (car c) (add1 (cdr c))))))
|
|
|
|
(define (covered-cases cov)
|
|
(hash-map (coverage-counts cov) (λ (k v) v)))
|
|
|
|
(define-struct coverage (relation counts))
|
|
|
|
(define-syntax (fresh-coverage stx)
|
|
(syntax-case stx ()
|
|
[(name subj-stx)
|
|
(with-syntax ([subj
|
|
(cond [(and (identifier? (syntax subj-stx))
|
|
(let ([tf (syntax-local-value (syntax subj-stx) (λ () #f))])
|
|
(and (term-fn? tf) (term-fn-get-id tf))))
|
|
=> values]
|
|
[else (syntax (let ([r subj-stx])
|
|
(if (reduction-relation? r)
|
|
r
|
|
(raise-type-error 'name "reduction-relation" r))))])])
|
|
(syntax
|
|
(let ([h (make-hasheq)])
|
|
(cond [(metafunc-proc? subj)
|
|
(for-each
|
|
(λ (c) (hash-set! h (metafunc-case-id c) (cons (metafunc-case-src-loc c) 0)))
|
|
(metafunc-proc-cases subj))]
|
|
[(reduction-relation? subj)
|
|
(for-each
|
|
(λ (rwp)
|
|
(hash-set! h (rewrite-proc-id rwp) (cons (or (rewrite-proc-name rwp) (rewrite-proc-lhs-src rwp)) 0)))
|
|
(reduction-relation-make-procs subj))])
|
|
(make-coverage subj h))))]))
|
|
|
|
(define-syntax (test-match stx)
|
|
(syntax-case stx ()
|
|
[(_ lang-exp pattern)
|
|
(identifier? #'lang-exp)
|
|
(with-syntax ([side-condition-rewritten (rewrite-side-conditions/check-errs
|
|
(language-id-nts #'lang-exp 'redex-match)
|
|
'redex-match
|
|
#t
|
|
(syntax pattern))])
|
|
(syntax
|
|
(do-test-match lang-exp `side-condition-rewritten)))]
|
|
[(_ lang-exp pattern expression)
|
|
(identifier? #'lang-exp)
|
|
(syntax
|
|
((test-match lang-exp pattern) expression))]
|
|
[(_ a b c)
|
|
(raise-syntax-error 'redex-match "expected an identifier (bound to a language) as first argument" stx #'a)]
|
|
[(_ a b)
|
|
(raise-syntax-error 'redex-match "expected an identifier (bound to a language) as first argument" stx #'a)]))
|
|
|
|
(define-struct match (bindings) #:inspector #f)
|
|
|
|
(define (do-test-match lang pat)
|
|
(unless (compiled-lang? lang)
|
|
(error 'redex-match "expected first argument to be a language, got ~e" lang))
|
|
(let ([cpat (compile-pattern lang pat #t)])
|
|
(λ (exp)
|
|
(let ([ans (match-pattern cpat exp)])
|
|
(and ans
|
|
(map (λ (m) (make-match (sort-bindings (bindings-table (mtch-bindings m)))))
|
|
ans))))))
|
|
|
|
(define (sort-bindings bnds)
|
|
(sort
|
|
bnds
|
|
(λ (x y) (string-ci<=? (symbol->string (bind-name x))
|
|
(symbol->string (bind-name y))))))
|
|
|
|
(define-values (struct:metafunc-proc make-metafunc-proc metafunc-proc? metafunc-proc-ref metafunc-proc-set!)
|
|
(make-struct-type 'metafunc-proc #f 8 0 #f null (current-inspector) 0))
|
|
(define metafunc-proc-pict-info (make-struct-field-accessor metafunc-proc-ref 1))
|
|
(define metafunc-proc-lang (make-struct-field-accessor metafunc-proc-ref 2))
|
|
(define metafunc-proc-multi-arg? (make-struct-field-accessor metafunc-proc-ref 3))
|
|
(define metafunc-proc-name (make-struct-field-accessor metafunc-proc-ref 4))
|
|
(define metafunc-proc-in-dom? (make-struct-field-accessor metafunc-proc-ref 5))
|
|
(define metafunc-proc-dom-pat (make-struct-field-accessor metafunc-proc-ref 6))
|
|
(define metafunc-proc-cases (make-struct-field-accessor metafunc-proc-ref 7))
|
|
|
|
(define-struct metafunction (proc))
|
|
|
|
(define-struct metafunc-case (cp rhs lhs-pat src-loc id))
|
|
|
|
;; Intermediate structures recording clause "extras" for typesetting.
|
|
(define-struct metafunc-extra-side-cond (expr))
|
|
(define-struct metafunc-extra-where (lhs rhs))
|
|
(define-struct metafunc-extra-fresh (vars))
|
|
|
|
(define-syntax (in-domain? stx)
|
|
(syntax-case stx ()
|
|
[(_ (name exp ...))
|
|
(begin
|
|
(unless (identifier? #'name)
|
|
(raise-syntax-error #f "expected an identifier" stx #'name))
|
|
#'(in-domain?/proc (metafunction-form name) (term (exp ...))))]))
|
|
|
|
(define (in-domain?/proc mf exp)
|
|
(let ([mp (metafunction-proc mf)])
|
|
((metafunc-proc-in-dom? mp)
|
|
exp)))
|
|
|
|
|
|
;
|
|
;
|
|
;
|
|
; ; ;;; ; ;;
|
|
; ;; ;;;; ;; ;;
|
|
; ;;;;;;; ;;;; ;;; ;;;;; ;;;;;;; ;;;;; ;;;; ;;;; ;;;; ;;; ;;;;; ;;;;; ;;;; ;;;; ;;;
|
|
; ;;;;;;;;;;;;; ;;;;; ;;;;;; ;;;;;;;; ;;;; ;;;; ;;;; ;;;;;;;;; ;;;;;; ;;;;;; ;;;; ;;;;;; ;;;;;;;;;
|
|
; ;;;; ;;; ;;;; ;;;; ;; ;;;; ;;;; ;;;;;; ;;;; ;;;; ;;;; ;;;; ;;;;;;; ;;;; ;;;; ;;;;;;;; ;;;; ;;;;
|
|
; ;;;; ;;; ;;;; ;;;;;;; ;;;; ;;;;;;; ;;;;;; ;;;; ;;;; ;;;; ;;;; ;;;; ;;;; ;;;; ;;;; ;;; ;;;; ;;;;
|
|
; ;;;; ;;; ;;;; ;;;;; ;;;;; ;; ;;;; ;;;; ;;;; ;;;; ;;;; ;;;; ;;;;;;; ;;;;; ;;;; ;;;;;;;; ;;;; ;;;;
|
|
; ;;;; ;;; ;;;; ;;;;;; ;;;;; ;;;;;;;; ;;;; ;;;;;;;;; ;;;; ;;;; ;;;;;; ;;;;; ;;;; ;;;;;; ;;;; ;;;;
|
|
; ;;;; ;;; ;;;; ;;;; ;;;; ;; ;;;; ;;;; ;;; ;;;; ;;;; ;;;; ;;;;; ;;;; ;;;; ;;;; ;;;; ;;;;
|
|
;
|
|
;
|
|
;
|
|
|
|
(define-syntax-set (define-metafunction define-metafunction/extension define-relation)
|
|
|
|
(define (define-metafunction/proc stx)
|
|
(syntax-case stx ()
|
|
[(_ . rest)
|
|
(internal-define-metafunction stx #f #'rest #f)]))
|
|
|
|
(define (define-relation/proc stx)
|
|
(syntax-case stx ()
|
|
[(_ . rest)
|
|
;; need to rule out the contracts for this one
|
|
(internal-define-metafunction stx #f #'rest #t)]))
|
|
|
|
(define (define-metafunction/extension/proc stx)
|
|
(syntax-case stx ()
|
|
[(_ prev . rest)
|
|
(identifier? #'prev)
|
|
(internal-define-metafunction stx #'prev #'rest #f)]))
|
|
|
|
(define (internal-define-metafunction orig-stx prev-metafunction stx relation?)
|
|
(syntax-case stx ()
|
|
[(lang . rest)
|
|
(let ([syn-error-name (if relation?
|
|
'define-relation
|
|
(if prev-metafunction
|
|
'define-metafunction/extension
|
|
'define-metafunction))])
|
|
(unless (identifier? #'lang)
|
|
(raise-syntax-error syn-error-name "expected an identifier in the language position" orig-stx #'lang))
|
|
(when (null? (syntax-e #'rest))
|
|
(raise-syntax-error syn-error-name "no clauses" orig-stx))
|
|
(when prev-metafunction
|
|
(syntax-local-value
|
|
prev-metafunction
|
|
(λ ()
|
|
(raise-syntax-error syn-error-name "expected a previously defined metafunction" orig-stx prev-metafunction))))
|
|
(prune-syntax
|
|
(let ([lang-nts (language-id-nts #'lang 'define-metafunction)]) ;; keep this near the beginning, so it signals the first error (PR 10062)
|
|
(let-values ([(contract-name dom-ctcs codom-contract pats)
|
|
(split-out-contract orig-stx syn-error-name #'rest relation?)])
|
|
(with-syntax ([(((original-names lhs-clauses ...) raw-rhses ...) ...) pats]
|
|
[(lhs-for-lw ...)
|
|
(with-syntax ([((lhs-for-lw _ ...) ...) pats])
|
|
(map (λ (x) (to-lw/proc (datum->syntax #f (cdr (syntax-e x)) x)))
|
|
(syntax->list #'(lhs-for-lw ...))))])
|
|
(with-syntax ([((rhs stuff ...) ...) (if relation?
|
|
#'((,(and (term raw-rhses) ...)) ...)
|
|
#'((raw-rhses ...) ...))])
|
|
(parameterize ([is-term-fn?
|
|
(let ([names (syntax->list #'(original-names ...))])
|
|
(λ (x) (and (not (null? names))
|
|
(identifier? (car names))
|
|
(free-identifier=? x (car names)))))])
|
|
(with-syntax ([(lhs ...) #'((lhs-clauses ...) ...)]
|
|
[name (let loop ([name (if contract-name
|
|
contract-name
|
|
(car (syntax->list #'(original-names ...))))]
|
|
[names (if contract-name
|
|
(syntax->list #'(original-names ...))
|
|
(cdr (syntax->list #'(original-names ...))))])
|
|
(cond
|
|
[(null? names) name]
|
|
[else
|
|
(unless (eq? (syntax-e name) (syntax-e (car names)))
|
|
(raise
|
|
(make-exn:fail:syntax
|
|
(if contract-name
|
|
"define-metafunction: expected each clause and the contract to use the same name"
|
|
"define-metafunction: expected each clause to use the same name")
|
|
(current-continuation-marks)
|
|
(list name
|
|
(car names)))))
|
|
(loop name (cdr names))]))])
|
|
(when (and prev-metafunction (eq? (syntax-e #'name) (syntax-e prev-metafunction)))
|
|
(raise-syntax-error syn-error-name "the extended and extending metafunctions cannot share a name" orig-stx prev-metafunction))
|
|
(parse-extras #'((stuff ...) ...))
|
|
(with-syntax ([(((cp-let-bindings ...) rhs/wheres) ...)
|
|
(map (λ (sc/b rhs)
|
|
(let-values ([(body-code cp-let-bindings)
|
|
(bind-withs
|
|
syn-error-name '()
|
|
#'lang lang-nts
|
|
sc/b 'flatten
|
|
#`(list (term #,rhs)))])
|
|
(list cp-let-bindings body-code)))
|
|
(syntax->list #'((stuff ...) ...))
|
|
(syntax->list #'(rhs ...)))]
|
|
[(((rg-cp-let-bindings ...) rg-rhs/wheres) ...)
|
|
(map (λ (sc/b rhs)
|
|
(let-values ([(body-code cp-let-bindings)
|
|
(bind-withs
|
|
syn-error-name '()
|
|
#'lang lang-nts
|
|
sc/b 'predicate
|
|
#`#t)])
|
|
(list cp-let-bindings body-code)))
|
|
(syntax->list #'((stuff ...) ...))
|
|
(syntax->list #'(rhs ...)))])
|
|
(with-syntax ([(side-conditions-rewritten ...)
|
|
(map (λ (x) (rewrite-side-conditions/check-errs
|
|
lang-nts
|
|
syn-error-name
|
|
#t
|
|
x))
|
|
(syntax->list (syntax (lhs ...))))]
|
|
[(rg-side-conditions-rewritten ...)
|
|
(map (λ (x) (rewrite-side-conditions/check-errs
|
|
lang-nts
|
|
syn-error-name
|
|
#t
|
|
x))
|
|
(syntax->list (syntax ((side-condition lhs rg-rhs/wheres) ...))))]
|
|
[(clause-src ...)
|
|
(map (λ (lhs)
|
|
(format "~a:~a:~a"
|
|
(syntax-source lhs)
|
|
(syntax-line lhs)
|
|
(syntax-column lhs)))
|
|
pats)]
|
|
[dom-side-conditions-rewritten
|
|
(and dom-ctcs
|
|
(rewrite-side-conditions/check-errs
|
|
lang-nts
|
|
syn-error-name
|
|
#f
|
|
dom-ctcs))]
|
|
[codom-side-conditions-rewritten
|
|
(rewrite-side-conditions/check-errs
|
|
lang-nts
|
|
syn-error-name
|
|
#f
|
|
codom-contract)]
|
|
[(rhs-fns ...)
|
|
(map (λ (lhs rhs/where)
|
|
(let-values ([(names names/ellipses)
|
|
(extract-names lang-nts syn-error-name #t lhs)])
|
|
(with-syntax ([(names ...) names]
|
|
[(names/ellipses ...) names/ellipses]
|
|
[rhs/where rhs/where])
|
|
(syntax
|
|
(λ (name bindings)
|
|
(term-let-fn ((name name))
|
|
(term-let ([names/ellipses (lookup-binding bindings 'names)] ...)
|
|
rhs/where)))))))
|
|
(syntax->list (syntax (lhs ...)))
|
|
(syntax->list (syntax (rhs/wheres ...))))]
|
|
[(name2 name-predicate) (generate-temporaries (syntax (name name)))]
|
|
|
|
;; See "!!" below for information on the `seq-' bindings:
|
|
[seq-of-rhs #'(rhs ...)]
|
|
[seq-of-lhs #'(lhs ...)]
|
|
[seq-of-tl-side-cond/binds #'((stuff ...) ...)]
|
|
[seq-of-lhs-for-lw #'(lhs-for-lw ...)])
|
|
(with-syntax ([defs #`(begin
|
|
(define-values (name2 name-predicate)
|
|
(let ([sc `(side-conditions-rewritten ...)]
|
|
[dsc `dom-side-conditions-rewritten]
|
|
cp-let-bindings ... ...
|
|
rg-cp-let-bindings ... ...)
|
|
(let ([cases (map (λ (pat rhs-fn rg-lhs src)
|
|
(make-metafunc-case
|
|
(compile-pattern lang pat #t) rhs-fn rg-lhs src (gensym)))
|
|
sc
|
|
(list rhs-fns ...)
|
|
`(rg-side-conditions-rewritten ...)
|
|
`(clause-src ...))]
|
|
[parent-cases
|
|
#,(if prev-metafunction
|
|
#`(metafunc-proc-cases #,(term-fn-get-id (syntax-local-value prev-metafunction)))
|
|
#'null)])
|
|
(build-metafunction
|
|
lang
|
|
cases
|
|
parent-cases
|
|
(λ (f/dom)
|
|
(make-metafunc-proc
|
|
(let ([name (lambda (x) (f/dom x))]) name)
|
|
;; !! This code goes back to phase 1 to call `to-lw', but it's delayed
|
|
;; through `let-syntax' instead of `unsyntax' so that `to-lw' isn't called
|
|
;; until all metafunction definitions have been processed.
|
|
;; It gets a little complicated because we want to use sequences from the
|
|
;; original `define-metafunction' (step 1) and sequences that are generated within
|
|
;; `let-syntax' (step 2). So we quote all the `...' in the `let-syntax' form ---
|
|
;; and also have to quote all uses step-1 pattern variables in case they produce
|
|
;; `...', which should be treated as literals at step 2. Hece the `seq-' bindings
|
|
;; above and a quoting `...' on each use of a `seq-' binding.
|
|
(...
|
|
(let-syntax
|
|
([generate-lws
|
|
(lambda (stx)
|
|
(with-syntax
|
|
([(rhs/lw ...) (map to-lw/proc (syntax->list #'(... seq-of-rhs)))]
|
|
[(((bind-id/lw . bind-pat/lw) ...) ...)
|
|
;; Also for pict, extract pattern bindings
|
|
(map (λ (x) (map (λ (x) (cons (to-lw/proc (car x)) (to-lw/proc (cdr x))))
|
|
(extract-pattern-binds x)))
|
|
(syntax->list #'(... seq-of-lhs)))]
|
|
|
|
[((where/sc/lw ...) ...)
|
|
;; Also for pict, extract where bindings
|
|
(map (λ (hm)
|
|
(map
|
|
(λ (lst)
|
|
(syntax-case lst (unquote side-condition where)
|
|
[(where pat (unquote (f _ _)))
|
|
(and (or (identifier? #'pat)
|
|
(andmap identifier? (syntax->list #'pat)))
|
|
(or (free-identifier=? #'f #'variable-not-in)
|
|
(free-identifier=? #'f #'variables-not-in)))
|
|
(with-syntax ([(ids ...)
|
|
(map to-lw/proc
|
|
(if (identifier? #'pat)
|
|
(list #'pat)
|
|
(syntax->list #'pat)))])
|
|
#`(make-metafunc-extra-fresh
|
|
(list ids ...)))]
|
|
[(where pat exp)
|
|
#`(make-metafunc-extra-where
|
|
#,(to-lw/proc #'pat) #,(to-lw/proc #'exp))]
|
|
[(side-condition x)
|
|
#`(make-metafunc-extra-side-cond
|
|
#,(to-lw/uq/proc #'x))]))
|
|
(reverse
|
|
(filter (λ (lst)
|
|
(syntax-case lst (where/hidden
|
|
side-condition/hidden)
|
|
[(where/hidden pat exp) #f]
|
|
[(side-condition/hidden x) #f]
|
|
[_ #t]))
|
|
(syntax->list hm)))))
|
|
(syntax->list #'(... seq-of-tl-side-cond/binds)))]
|
|
|
|
[(((rhs-bind-id/lw . rhs-bind-pat/lw/uq) ...) ...)
|
|
;; Also for pict, extract pattern bindings
|
|
(map (λ (x) (map (λ (x) (cons (to-lw/proc (car x)) (to-lw/uq/proc (cdr x))))
|
|
(extract-term-let-binds x)))
|
|
(syntax->list #'(... seq-of-rhs)))]
|
|
|
|
[(x-lhs-for-lw ...) #'(... seq-of-lhs-for-lw)])
|
|
#'(list (list x-lhs-for-lw
|
|
(list (make-metafunc-extra-where bind-id/lw bind-pat/lw) ...
|
|
(make-metafunc-extra-where rhs-bind-id/lw rhs-bind-pat/lw/uq) ...
|
|
where/sc/lw ...)
|
|
rhs/lw)
|
|
...)))])
|
|
(generate-lws)))
|
|
lang
|
|
#t ;; multi-args?
|
|
'name
|
|
(let ([name (lambda (x) (name-predicate x))]) name)
|
|
dsc
|
|
(append cases parent-cases)))
|
|
dsc
|
|
`codom-side-conditions-rewritten
|
|
'name
|
|
#,relation?))))
|
|
(term-define-fn name name2))])
|
|
(syntax-property
|
|
(if (eq? 'top-level (syntax-local-context))
|
|
; Introduce the names before using them, to allow
|
|
; metafunction definition at the top-level.
|
|
(syntax
|
|
(begin
|
|
(define-syntaxes (name2 name-predicate) (values))
|
|
defs))
|
|
(syntax defs))
|
|
'disappeared-use
|
|
(map syntax-local-introduce (syntax->list #'(original-names ...)))))))))))))))]
|
|
[(_ prev-metafunction name lang clauses ...)
|
|
(begin
|
|
(unless (identifier? #'name)
|
|
(raise-syntax-error 'define-metafunction "expected the name of a language" stx #'name))
|
|
(unless (identifier? #'lang)
|
|
(raise-syntax-error 'define-metafunction "expected the name of a language" stx #'lang))
|
|
(for-each
|
|
(λ (clause)
|
|
(syntax-case clause ()
|
|
[(a b) (void)]
|
|
[else
|
|
(raise-syntax-error 'define-metafunction "expected a lhs and rhs clause" stx clause)]))
|
|
(syntax->list (syntax (clauses ...))))
|
|
(raise-syntax-error 'define-metafunction "missing error check for bad syntax" stx))]))
|
|
|
|
(define (split-out-contract stx syn-error-name rest relation?)
|
|
;; initial test determines if a contract is specified or not
|
|
(cond
|
|
[(pair? (syntax-e (car (syntax->list rest))))
|
|
(values #f #f #'any (check-clauses stx syn-error-name (syntax->list rest) relation?))]
|
|
[else
|
|
(syntax-case rest ()
|
|
[(id colon more ...)
|
|
(begin
|
|
(unless (eq? ': (syntax-e #'colon))
|
|
(raise-syntax-error syn-error-name "expected a colon to follow the meta-function's name" stx #'colon))
|
|
(let loop ([more (syntax->list #'(more ...))]
|
|
[dom-pats '()])
|
|
(cond
|
|
[(null? more)
|
|
(raise-syntax-error syn-error-name "expected an ->" stx)]
|
|
[(eq? (syntax-e (car more)) '->)
|
|
(when (null? (cdr more))
|
|
(raise-syntax-error syn-error-name "expected a range contract to follow the arrow" stx (car more)))
|
|
(let ([doms (reverse dom-pats)]
|
|
[codomain (cadr more)]
|
|
[clauses (check-clauses stx syn-error-name (cddr more) relation?)])
|
|
(values #'id doms codomain clauses))]
|
|
[else
|
|
(loop (cdr more) (cons (car more) dom-pats))])))]
|
|
[_
|
|
(raise-syntax-error
|
|
syn-error-name
|
|
"expected the name of the meta-function, followed by its contract (or no name and no contract)"
|
|
stx
|
|
rest)])]))
|
|
|
|
(define (check-clauses stx syn-error-name rest relation?)
|
|
(syntax-case rest ()
|
|
[([(lhs ...) roc1 roc2 ...] ...)
|
|
rest]
|
|
[([(lhs ...) rhs ...] ...)
|
|
(if relation?
|
|
rest
|
|
(begin
|
|
(for-each
|
|
(λ (clause)
|
|
(syntax-case clause ()
|
|
[(a b) (void)]
|
|
[x (raise-syntax-error syn-error-name "expected a pattern and a right-hand side" stx clause)]))
|
|
rest)
|
|
(raise-syntax-error syn-error-name "error checking failed.3" stx)))]
|
|
[([x roc ...] ...)
|
|
(begin
|
|
(for-each
|
|
(λ (x)
|
|
(syntax-case x ()
|
|
[(lhs ...) (void)]
|
|
[x (raise-syntax-error syn-error-name "expected a function prototype" stx #'x)]))
|
|
(syntax->list #'(x ...)))
|
|
(raise-syntax-error syn-error-name "error checking failed.1" stx))]
|
|
[(x ...)
|
|
(begin
|
|
(for-each
|
|
(λ (x)
|
|
(syntax-case x ()
|
|
[(stuff ...) (void)]
|
|
[x (raise-syntax-error syn-error-name "expected a metafunction clause" stx #'x)]))
|
|
(syntax->list #'(x ...)))
|
|
(raise-syntax-error syn-error-name "error checking failed.2" stx))]))
|
|
|
|
(define (parse-extras extras)
|
|
(for-each
|
|
(λ (stuffs)
|
|
(for-each
|
|
(λ (stuff)
|
|
(syntax-case stuff (where side-condition where/hidden side-condition/hidden)
|
|
[(side-condition tl-side-conds ...)
|
|
(void)]
|
|
[(side-condition/hidden tl-side-conds ...)
|
|
(void)]
|
|
[(where x e)
|
|
(void)]
|
|
[(where/hidden x e)
|
|
(void)]
|
|
[(where . args)
|
|
(raise-syntax-error 'define-metafunction
|
|
"malformed where clause"
|
|
stuff)]
|
|
[(where/hidden . args)
|
|
(raise-syntax-error 'define-metafunction
|
|
"malformed where/hidden clause"
|
|
stuff)]
|
|
[_
|
|
(raise-syntax-error 'define-metafunction
|
|
"expected a side-condition or where clause"
|
|
stuff)]))
|
|
(syntax->list stuffs)))
|
|
(syntax->list extras))))
|
|
|
|
(define (build-metafunction lang cases parent-cases wrap dom-contract-pat codom-contract-pat name relation?)
|
|
(let ([dom-compiled-pattern (and dom-contract-pat (compile-pattern lang dom-contract-pat #f))]
|
|
[codom-compiled-pattern (compile-pattern lang codom-contract-pat #f)])
|
|
(values
|
|
(wrap
|
|
(letrec ([cache (make-hash)]
|
|
[cache-entries 0]
|
|
[not-in-cache (gensym)]
|
|
[cache-result (λ (arg res case)
|
|
(when (caching-enabled?)
|
|
(when (>= cache-entries cache-size)
|
|
(set! cache (make-hash))
|
|
(set! cache-entries 0))
|
|
(hash-set! cache arg (cons res case))
|
|
(set! cache-entries (add1 cache-entries))))]
|
|
[log-coverage (λ (id)
|
|
(when id
|
|
(for-each
|
|
(λ (c)
|
|
(let ([r (coverage-relation c)])
|
|
(when (and (metafunc-proc? r)
|
|
(findf (λ (c) (eq? id (metafunc-case-id c)))
|
|
(metafunc-proc-cases r)))
|
|
(cover-case id c))))
|
|
(relation-coverage))))]
|
|
[metafunc
|
|
(λ (exp)
|
|
(let ([cache-ref (hash-ref cache exp not-in-cache)])
|
|
(cond
|
|
[(or (not (caching-enabled?)) (eq? cache-ref not-in-cache))
|
|
(when dom-compiled-pattern
|
|
(unless (match-pattern dom-compiled-pattern exp)
|
|
(redex-error name
|
|
"~s is not in my domain"
|
|
`(,name ,@exp))))
|
|
(let loop ([cases (append cases parent-cases)]
|
|
[num (- (length parent-cases))])
|
|
(cond
|
|
[(null? cases)
|
|
(if relation?
|
|
(begin
|
|
(cache-result exp #f #f)
|
|
#f)
|
|
(redex-error name "no clauses matched for ~s" `(,name . ,exp)))]
|
|
[else
|
|
(let ([pattern (metafunc-case-cp (car cases))]
|
|
[rhs (metafunc-case-rhs (car cases))]
|
|
[id (metafunc-case-id (car cases))])
|
|
(let ([mtchs (match-pattern pattern exp)])
|
|
(cond
|
|
[(not mtchs) (loop (cdr cases) (+ num 1))]
|
|
[relation?
|
|
(let ([ans
|
|
(ormap (λ (mtch) (ormap values (rhs traced-metafunc (mtch-bindings mtch))))
|
|
mtchs)])
|
|
(unless (match-pattern codom-compiled-pattern ans)
|
|
(redex-error name "codomain test failed for ~s, call was ~s" ans `(,name ,@exp)))
|
|
(cond
|
|
[ans
|
|
(cache-result exp #t id)
|
|
(log-coverage id)
|
|
#t]
|
|
[else
|
|
(loop (cdr cases) (+ num 1))]))]
|
|
[else
|
|
(let ([anss (apply append
|
|
(filter values
|
|
(map (λ (mtch) (rhs traced-metafunc (mtch-bindings mtch)))
|
|
mtchs)))]
|
|
[ht (make-hash)])
|
|
(for-each (λ (ans) (hash-set! ht ans #t)) anss)
|
|
(cond
|
|
[(null? anss)
|
|
(loop (cdr cases) (+ num 1))]
|
|
[(not (= 1 (hash-count ht)))
|
|
(redex-error name "~a matched ~s ~a different ways and returned different results"
|
|
(if (< num 0)
|
|
"a clause from an extended metafunction"
|
|
(format "clause #~a (counting from 0)" num))
|
|
`(,name ,@exp)
|
|
(length mtchs))]
|
|
[else
|
|
(let ([ans (car anss)])
|
|
(unless (match-pattern codom-compiled-pattern ans)
|
|
(redex-error name
|
|
"codomain test failed for ~s, call was ~s"
|
|
ans
|
|
`(,name ,@exp)))
|
|
(cache-result exp ans id)
|
|
(log-coverage id)
|
|
ans)]))])))]))]
|
|
[else
|
|
(log-coverage (cdr cache-ref))
|
|
(car cache-ref)])))]
|
|
[ot (current-trace-print-args)]
|
|
[traced-metafunc (lambda (exp)
|
|
(if (or (eq? (current-traced-metafunctions) 'all)
|
|
(memq name (current-traced-metafunctions)))
|
|
(parameterize ([current-trace-print-args
|
|
(λ (name args kws kw-args level)
|
|
(ot name (car args) kws kw-args level))])
|
|
(trace-call name metafunc exp))
|
|
(metafunc exp)))])
|
|
traced-metafunc))
|
|
(if dom-compiled-pattern
|
|
(λ (exp) (and (match-pattern dom-compiled-pattern exp) #t))
|
|
(λ (exp) (and (ormap (λ (case) (match-pattern (metafunc-case-cp case) exp)) cases)
|
|
#t))))))
|
|
|
|
(define current-traced-metafunctions (make-parameter '()))
|
|
|
|
(define-syntax (metafunction-form stx)
|
|
(syntax-case stx ()
|
|
[(_ id)
|
|
(identifier? #'id)
|
|
(let ([v (syntax-local-value #'id (lambda () #f))])
|
|
(if (term-fn? v)
|
|
#`(make-metafunction #,(term-fn-get-id v))
|
|
(raise-syntax-error
|
|
#f
|
|
"not bound as a metafunction"
|
|
stx
|
|
#'id)))]))
|
|
|
|
;; pull-out-names : symbol syntax -> list-of-syntax[identifier identifier-or-false]
|
|
(define-for-syntax (pull-out-names form stx ids)
|
|
(let loop ([names (syntax->list ids)]
|
|
[acc '()])
|
|
(cond
|
|
[(null? names) acc]
|
|
[else
|
|
(let* ([name (car names)]
|
|
[lst (syntax->list name)])
|
|
(cond
|
|
[(identifier? name) (loop (cdr names) (cons #`(#,(syntax-e name) #f) acc))]
|
|
[(and (list? lst)
|
|
(andmap identifier? lst))
|
|
(loop (cdr names) (append
|
|
(list #`(#,(car lst) #f))
|
|
(map (λ (x) #`(#,(syntax-e x) #,(car lst)))
|
|
(cdr lst))
|
|
acc))]
|
|
[(list? lst)
|
|
(for-each (λ (x) (unless (identifier? x)
|
|
(raise-syntax-error form "expected an identifier" stx x)))
|
|
lst)]
|
|
[else
|
|
(raise-syntax-error form
|
|
"expected an identifier or a sequence of identifiers"
|
|
stx
|
|
name)]))])))
|
|
|
|
;; check-rhss-not-empty : syntax (listof syntax) -> void
|
|
(define-for-syntax (check-rhss-not-empty def-lang-stx nt-def-stxs)
|
|
(for-each
|
|
(λ (nt-def-stx)
|
|
(when (null? (cdr (syntax-e nt-def-stx)))
|
|
(raise-syntax-error 'define-language "non-terminal with no productions" def-lang-stx nt-def-stx)))
|
|
nt-def-stxs))
|
|
|
|
(define-syntax (define-language stx)
|
|
(syntax-case stx ()
|
|
[(_ name (names rhs ...) ...)
|
|
(identifier? (syntax name))
|
|
(begin
|
|
(check-rhss-not-empty stx (cddr (syntax->list stx)))
|
|
(with-syntax ([((nt-names orig) ...) (pull-out-names 'define-language stx #'(names ...))])
|
|
(with-syntax ([(subst-names ...) (generate-temporaries (syntax->list #'(nt-names ...)))])
|
|
(syntax/loc stx
|
|
(begin
|
|
(define-syntax name
|
|
(make-set!-transformer
|
|
(make-language-id
|
|
(case-lambda
|
|
[(stx)
|
|
(syntax-case stx (set!)
|
|
[(set! x e) (raise-syntax-error 'define-language "cannot set! identifier" stx #'e)]
|
|
[(x e (... ...)) #'(define-language-name e (... ...))]
|
|
[x
|
|
(identifier? #'x)
|
|
#'define-language-name])])
|
|
'(nt-names ...))))
|
|
(define define-language-name (language name (names rhs ...) ...)))))))]))
|
|
|
|
(define-struct binds (source binds))
|
|
|
|
(define-syntax (language stx)
|
|
(syntax-case stx ()
|
|
[(_ lang-id (name rhs ...) ...)
|
|
(prune-syntax
|
|
(let ()
|
|
|
|
;; verify `name' part has the right shape
|
|
(for-each
|
|
(λ (name)
|
|
(cond
|
|
[(identifier? name) (void)]
|
|
[else
|
|
(let ([lst (syntax->list name)])
|
|
(cond
|
|
[(list? lst)
|
|
(when (null? lst)
|
|
(raise-syntax-error 'language
|
|
"expected a sequence of identifiers with at least one identifier"
|
|
stx
|
|
name))
|
|
(for-each (λ (x) (unless (identifier? x)
|
|
(raise-syntax-error 'language
|
|
"expected an identifier"
|
|
stx
|
|
x)))
|
|
lst)]
|
|
[else
|
|
(raise-syntax-error 'language
|
|
"expected a sequence of identifiers"
|
|
stx
|
|
lst)]))]))
|
|
(syntax->list #'(name ...)))
|
|
(let ([all-names (apply append (map (λ (x) (if (identifier? x) (list x) (syntax->list x)))
|
|
(syntax->list #'(name ...))))])
|
|
;; verify the names are valid names
|
|
(for-each
|
|
(λ (name)
|
|
(let ([x (syntax->datum name)])
|
|
(when (memq x '(any number string variable natural integer real variable-except variable-prefix hole name in-hole hide-hole side-condition cross ...))
|
|
(raise-syntax-error 'language
|
|
(format "cannot use pattern language keyword ~a as non-terminal"
|
|
x)
|
|
stx
|
|
name))
|
|
(when (regexp-match #rx"_" (symbol->string x))
|
|
(raise-syntax-error 'language
|
|
"non-terminals cannot have _ in their names"
|
|
stx
|
|
name))))
|
|
all-names)
|
|
|
|
(with-syntax ([((r-rhs ...) ...)
|
|
(map (lambda (rhss)
|
|
(map (lambda (rhs)
|
|
(rewrite-side-conditions/check-errs
|
|
(map syntax-e all-names)
|
|
'language
|
|
#f
|
|
rhs))
|
|
(syntax->list rhss)))
|
|
(syntax->list (syntax ((rhs ...) ...))))]
|
|
[((rhs/lw ...) ...)
|
|
(map (lambda (rhss) (map to-lw/proc (syntax->list rhss)))
|
|
(syntax->list (syntax ((rhs ...) ...))))]
|
|
[(refs ...)
|
|
(let loop ([stx (syntax ((rhs ...) ...))])
|
|
(cond
|
|
[(identifier? stx)
|
|
(if (ormap (λ (x) (bound-identifier=? x stx))
|
|
all-names)
|
|
(list stx)
|
|
'())]
|
|
[(syntax? stx)
|
|
(loop (syntax-e stx))]
|
|
[(pair? stx)
|
|
(append (loop (car stx))
|
|
(loop (cdr stx)))]
|
|
[else '()]))])
|
|
(with-syntax ([(the-stx ...) (cdr (syntax-e stx))]
|
|
[(all-names ...) all-names]
|
|
[((uniform-names ...) ...)
|
|
(map (λ (x) (if (identifier? x) (list x) x))
|
|
(syntax->list (syntax (name ...))))]
|
|
[(first-names ...)
|
|
(map (λ (x) (if (identifier? x) x (car (syntax->list x))))
|
|
(syntax->list (syntax (name ...))))]
|
|
[((new-name orig-name) ...)
|
|
(apply
|
|
append
|
|
(map (λ (name-stx)
|
|
(if (identifier? name-stx)
|
|
'()
|
|
(let ([l (syntax->list name-stx)])
|
|
(map (λ (x) (list x (car l)))
|
|
(cdr l)))))
|
|
(syntax->list #'(name ...))))])
|
|
|
|
;; note: when there are multiple names for a single non-terminal,
|
|
;; we build equivalent non-terminals by redirecting all except the
|
|
;; first non-terminal to the first one, and then make the first one
|
|
;; actually have all of the productions. This should produce better
|
|
;; caching behavior and should compile faster than duplicating the
|
|
;; right-hand sides.
|
|
(syntax/loc stx
|
|
(begin
|
|
(let ([all-names 1] ...)
|
|
(begin (void) refs ...))
|
|
(compile-language (list (list '(uniform-names ...) rhs/lw ...) ...)
|
|
(list (make-nt 'first-names (list (make-rhs `r-rhs) ...)) ...
|
|
(make-nt 'new-name (list (make-rhs 'orig-name))) ...)
|
|
'((uniform-names ...) ...)))))))))]
|
|
[(_ (name rhs ...) ...)
|
|
(for-each
|
|
(lambda (name)
|
|
(unless (identifier? name)
|
|
(raise-syntax-error 'language "expected name" stx name)))
|
|
(syntax->list (syntax (name ...))))]
|
|
[(_ x ...)
|
|
(for-each
|
|
(lambda (x)
|
|
(syntax-case x ()
|
|
[(name rhs ...)
|
|
(void)]
|
|
[_
|
|
(raise-syntax-error 'language "malformed non-terminal" stx x)]))
|
|
(syntax->list (syntax (x ...))))]))
|
|
|
|
(define-syntax (define-extended-language stx)
|
|
(syntax-case stx ()
|
|
[(_ name orig-lang (names rhs ...) ...)
|
|
(begin
|
|
(unless (identifier? (syntax name))
|
|
(raise-syntax-error 'define-extended-language "expected an identifier" stx #'name))
|
|
(unless (identifier? (syntax orig-lang))
|
|
(raise-syntax-error 'define-extended-language "expected an identifier" stx #'orig-lang))
|
|
(check-rhss-not-empty stx (cdddr (syntax->list stx)))
|
|
(let ([old-names (language-id-nts #'orig-lang 'define-extended-language)])
|
|
(with-syntax ([((new-nt-names orig) ...) (append (pull-out-names 'define-language stx #'(names ...))
|
|
(map (λ (x) #`(#,x #f)) old-names))])
|
|
#'(begin
|
|
(define define-language-name (extend-language orig-lang (names rhs ...) ...))
|
|
(define-syntax name
|
|
(make-set!-transformer
|
|
(make-language-id
|
|
(λ (stx)
|
|
(syntax-case stx (set!)
|
|
[(set! x e) (raise-syntax-error 'define-extended-language "cannot set! identifier" stx #'e)]
|
|
[(x e (... ...)) #'(define-language-name e (... ...))]
|
|
[x
|
|
(identifier? #'x)
|
|
#'define-language-name]))
|
|
'(new-nt-names ...))))))))]))
|
|
|
|
(define-syntax (extend-language stx)
|
|
(syntax-case stx ()
|
|
[(_ lang (name rhs ...) ...)
|
|
(and (identifier? #'lang)
|
|
(andmap (λ (names)
|
|
(syntax-case names ()
|
|
[(name1 name2 ...)
|
|
(and (identifier? #'name1)
|
|
(andmap identifier? (syntax->list #'(name2 ...))))
|
|
#t]
|
|
[name
|
|
(identifier? #'name)
|
|
#t]
|
|
[_ #f]))
|
|
(syntax->list (syntax/loc stx (name ...)))))
|
|
(with-syntax ([((r-rhs ...) ...) (map (lambda (rhss) (map (λ (x) (rewrite-side-conditions/check-errs
|
|
(language-id-nts #'lang 'extend-language)
|
|
'extend-language
|
|
#f
|
|
x))
|
|
(syntax->list rhss)))
|
|
(syntax->list (syntax ((rhs ...) ...))))]
|
|
[((rhs/lw ...) ...) (map (lambda (rhss) (map to-lw/proc (syntax->list rhss)))
|
|
(syntax->list (syntax ((rhs ...) ...))))]
|
|
[(first-names ...)
|
|
(map (λ (x) (if (identifier? x) x (car (syntax->list x))))
|
|
(syntax->list (syntax (name ...))))]
|
|
[((uniform-names ...) ...)
|
|
(map (λ (x) (if (identifier? x) (list x) x))
|
|
(syntax->list (syntax (name ...))))]
|
|
|
|
[((new-name orig-name) ...)
|
|
(apply
|
|
append
|
|
(map (λ (name-stx)
|
|
(if (identifier? name-stx)
|
|
'()
|
|
(let ([l (syntax->list name-stx)])
|
|
(map (λ (x) (list x (car l)))
|
|
(cdr l)))))
|
|
(syntax->list #'(name ...))))])
|
|
(syntax/loc stx
|
|
(do-extend-language lang
|
|
(list (make-nt '(uniform-names ...) (list (make-rhs `r-rhs) ...)) ...)
|
|
(list (list '(uniform-names ...) rhs/lw ...) ...))))]
|
|
[(_ lang (name rhs ...) ...)
|
|
(begin
|
|
(unless (identifier? #'lang)
|
|
(error 'extend-language "expected the name of a language" stx #'lang))
|
|
(for-each
|
|
(lambda (name)
|
|
(unless (syntax-case name ()
|
|
[(name1 name2 ...)
|
|
(and (identifier? #'name1)
|
|
(andmap identifier? #'(name2 ...)))
|
|
#t]
|
|
[name
|
|
(identifier? #'name)
|
|
#t]
|
|
[else #f])
|
|
(raise-syntax-error 'extend-language "expected a name or a non-empty sequence of names" stx name)))
|
|
(syntax->list (syntax (name ...)))))]
|
|
[(_ lang x ...)
|
|
(for-each
|
|
(lambda (x)
|
|
(syntax-case x ()
|
|
[(name rhs ...)
|
|
(void)]
|
|
[_
|
|
(raise-syntax-error 'extend-language "malformed non-terminal" stx x)]))
|
|
(syntax->list (syntax (x ...))))]))
|
|
|
|
(define extend-nt-ellipses '(....))
|
|
|
|
;; do-extend-language : compiled-lang (listof (listof nt)) ? -> compiled-lang
|
|
;; note: the nts that come here are an abuse of the `nt' struct; they have
|
|
;; lists of symbols in the nt-name field.
|
|
(define (do-extend-language old-lang new-nts new-pict-infos)
|
|
(unless (compiled-lang? old-lang)
|
|
(error 'extend-language "expected a language as first argument, got ~e" old-lang))
|
|
|
|
(let ([old-nts (compiled-lang-lang old-lang)]
|
|
[old-ht (make-hasheq)]
|
|
[new-ht (make-hasheq)])
|
|
|
|
|
|
(for-each (λ (nt)
|
|
(hash-set! old-ht (nt-name nt) nt)
|
|
(hash-set! new-ht (nt-name nt) nt))
|
|
old-nts)
|
|
|
|
(for-each (λ (raw-nt)
|
|
(let* ([names (nt-name raw-nt)]
|
|
[rhs (nt-rhs raw-nt)]
|
|
[primary-names (map (λ (name) (find-primary-nt name old-lang)) names)]
|
|
[main-primary (car primary-names)])
|
|
|
|
;; error checking
|
|
(when (and (ormap not primary-names)
|
|
(ormap symbol? primary-names))
|
|
(error 'extend-language "new language extends old non-terminal ~a and also adds new shortcut ~a"
|
|
(ormap (λ (x y) (and (symbol? x) y)) primary-names names)
|
|
(ormap (λ (x y) (and (not x) y)) primary-names names)))
|
|
|
|
;; error checking
|
|
(when (andmap symbol? primary-names)
|
|
(let ([main-orig (car names)])
|
|
(let loop ([primary-names (cdr primary-names)]
|
|
[names (cdr names)])
|
|
(cond
|
|
[(null? primary-names) void]
|
|
[else
|
|
(unless (eq? main-primary (car primary-names))
|
|
(error 'extend-language
|
|
(string-append
|
|
"new language does not have the same non-terminal aliases as the old,"
|
|
" non-terminal ~a was not in the same group as ~a in the old language")
|
|
(car names)
|
|
main-orig))
|
|
(loop (cdr primary-names) (cdr names))]))))
|
|
|
|
|
|
;; rebind original nt
|
|
(let ([nt (make-nt (or main-primary (car names)) rhs)])
|
|
(cond
|
|
[(ormap (λ (rhs) (member (rhs-pattern rhs) extend-nt-ellipses))
|
|
(nt-rhs nt))
|
|
(unless (hash-ref old-ht (nt-name nt) #f)
|
|
(error 'extend-language
|
|
"the language extends the ~s non-terminal, but that non-terminal is not in the old language"
|
|
(nt-name nt)))
|
|
(hash-set! new-ht
|
|
(nt-name nt)
|
|
(make-nt
|
|
(nt-name nt)
|
|
(append (nt-rhs (hash-ref old-ht (nt-name nt)))
|
|
(filter (λ (rhs) (not (member (rhs-pattern rhs) extend-nt-ellipses)))
|
|
(nt-rhs nt)))))]
|
|
[else
|
|
(hash-set! new-ht (nt-name nt) nt)]))
|
|
|
|
;; add new shortcuts (if necessary)
|
|
(unless main-primary
|
|
(for-each (λ (shortcut-name)
|
|
(hash-set! new-ht
|
|
shortcut-name
|
|
(make-nt shortcut-name (list (make-rhs (car names))))))
|
|
(cdr names)))))
|
|
|
|
new-nts)
|
|
|
|
(compile-language (vector (compiled-lang-pict-builder old-lang)
|
|
new-pict-infos)
|
|
(hash-map new-ht (λ (x y) y))
|
|
(compiled-lang-nt-map old-lang))))
|
|
|
|
;; find-primary-nt : symbol lang -> symbol or #f
|
|
;; returns the primary non-terminal for a given nt, or #f if `nt' isn't bound in the language.
|
|
(define (find-primary-nt nt lang)
|
|
(let ([combined (find-combined-nts nt lang)])
|
|
(and combined
|
|
(car combined))))
|
|
|
|
;; find-combined-nts : symbol lang -> (listof symbol) or #f
|
|
;; returns the combined set of non-terminals for 'nt' from lang
|
|
(define (find-combined-nts nt lang)
|
|
(ormap (λ (nt-line)
|
|
(and (member nt nt-line)
|
|
nt-line))
|
|
(compiled-lang-nt-map lang)))
|
|
|
|
(define (apply-reduction-relation* reductions exp)
|
|
(let-values ([(results cycle?) (apply-reduction-relation*/cycle? reductions exp)])
|
|
results))
|
|
|
|
(define (apply-reduction-relation*/cycle? reductions exp)
|
|
(let ([answers (make-hash)]
|
|
[cycle? #f])
|
|
(let loop ([exp exp]
|
|
[path (make-immutable-hash '())])
|
|
(cond
|
|
[(hash-ref path exp #f)
|
|
(set! cycle? #t)]
|
|
[else
|
|
(let ([nexts (apply-reduction-relation reductions exp)])
|
|
(cond
|
|
[(null? nexts) (hash-set! answers exp #t)]
|
|
[else (for-each
|
|
(λ (next) (loop next (hash-set path exp #t)))
|
|
nexts)]))]))
|
|
(values (sort (hash-map answers (λ (x y) x))
|
|
string<=?
|
|
#:key (λ (x) (format "~s" x)))
|
|
cycle?)))
|
|
|
|
;; map/mt : (a -> b) (listof a) (listof b) -> (listof b)
|
|
;; map/mt is like map, except
|
|
;; a) it uses the last argument instead of the empty list
|
|
;; b) if `f' returns #f, that is not included in the result
|
|
(define (map/mt f l mt-l)
|
|
(let loop ([l l])
|
|
(cond
|
|
[(null? l) mt-l]
|
|
[else
|
|
(let ([this-one (f (car l))])
|
|
(if this-one
|
|
(cons this-one (loop (cdr l)))
|
|
(loop (cdr l))))])))
|
|
|
|
(define (reduction-relation->rule-names x)
|
|
(reverse (reduction-relation-rule-names x)))
|
|
|
|
|
|
;
|
|
;
|
|
;
|
|
; ; ; ;; ;
|
|
; ;; ;; ;; ;;
|
|
; ;;;;; ;;; ;;;;; ;;;;; ;;;;; ;;;; ;;;; ;;;;; ;;; ;;;;;
|
|
; ;;;;;; ;;;;; ;;;;;; ;;;;;; ;;;;;; ;;;; ;;;; ;;;; ;;;;;; ;;;;; ;;;;;;
|
|
; ;;;; ;;;; ;; ;;;; ;;;; ;;;; ;;;; ;;;; ;;;; ;;;; ;;;; ;; ;;;;
|
|
; ;;;; ;;;;;;; ;;;; ;;;; ;;;; ;;;; ;;;; ;;;; ;;;; ;;;;;;; ;;;;
|
|
; ;;;;; ;;;;; ;;;; ;;;;; ;;;; ;;;; ;;;; ;;;; ;;;;; ;;;;; ;;;;
|
|
; ;;;;; ;;;;;; ;;;;;; ;;;;; ;;;;;; ;;;;;;;;; ;;;; ;;;;; ;;;;;; ;;;;;;
|
|
; ;;;; ;;;; ;;;;; ;;;; ;;;;; ;;; ;;;; ;;;; ;;;; ;;;; ;;;;;
|
|
;
|
|
;
|
|
;
|
|
|
|
(define tests 0)
|
|
(define test-failures 0)
|
|
(define (inc-failures) (set! test-failures (+ test-failures 1)))
|
|
(define (inc-tests) (set! tests (+ tests 1)))
|
|
|
|
(define (test-results)
|
|
(cond
|
|
[(= tests 0)
|
|
(printf "No tests run.\n")]
|
|
[(= test-failures 0)
|
|
(cond
|
|
[(= tests 1)
|
|
(printf "One test passed.\n")]
|
|
[(= tests 2)
|
|
(printf "Both tests passed.\n")]
|
|
[else
|
|
(printf "All ~a tests passed.\n" tests)])]
|
|
[else
|
|
(printf "~a test~a failed (out of ~a total).\n"
|
|
test-failures
|
|
(if (= test-failures 1) "" "s")
|
|
tests)])
|
|
(set! tests 0)
|
|
(set! test-failures 0))
|
|
|
|
(define-for-syntax (get-srcloc stx)
|
|
#`(list
|
|
'#,(syntax-source stx)
|
|
'#,(syntax-line stx)
|
|
'#,(syntax-column stx)
|
|
'#,(syntax-position stx)))
|
|
|
|
(define (check-equiv-pred form p)
|
|
(unless (and (procedure? p) (procedure-arity-includes? p 2))
|
|
(raise-type-error form "procedure (arity 2)" p)))
|
|
|
|
(define-syntax (test-->> stx)
|
|
(syntax-parse stx
|
|
[(form red:expr
|
|
(~or (~optional (~seq (~and #:cycles-ok (~bind [cycles-ok? #t])))
|
|
#:defaults ([cycles-ok? #f])
|
|
#:name "#:cycles-ok keyword")
|
|
(~optional (~seq #:equiv equiv?:expr)
|
|
#:defaults ([equiv? #'equal?])
|
|
#:name "#:equiv keyword"))
|
|
...
|
|
e1:expr
|
|
e2:expr ...)
|
|
#`(let ([=? equiv?])
|
|
(check-equiv-pred 'form =?)
|
|
(test-->>/procs red e1 (list e2 ...) apply-reduction-relation*/cycle? #,(attribute cycles-ok?) =? #,(get-srcloc stx)))]))
|
|
|
|
(define-syntax (test--> stx)
|
|
(syntax-parse stx
|
|
[(form red:expr
|
|
(~optional (~seq #:equiv equiv?:expr)
|
|
#:defaults ([equiv? #'equal?]))
|
|
e1:expr
|
|
e2:expr ...)
|
|
#`(let ([=? equiv?])
|
|
(check-equiv-pred 'form =?)
|
|
(test-->>/procs red e1 (list e2 ...) apply-reduction-relation/dummy-second-value #t =? #,(get-srcloc stx)))]))
|
|
|
|
(define (apply-reduction-relation/dummy-second-value red arg)
|
|
(values (apply-reduction-relation red arg) #f))
|
|
|
|
(define (test-->>/procs red arg expected apply-red cycles-ok? equiv? srcinfo)
|
|
(unless (reduction-relation? red)
|
|
(error 'test--> "expected a reduction relation as first argument, got ~e" red))
|
|
(let-values ([(got got-cycle?) (apply-red red arg)])
|
|
(inc-tests)
|
|
|
|
(cond
|
|
[(and got-cycle?
|
|
(not cycles-ok?))
|
|
(inc-failures)
|
|
(print-failed srcinfo)
|
|
(fprintf (current-error-port) "found a cycle in the reduction graph\n")]
|
|
[else
|
|
(unless (set-equal? expected got equiv?)
|
|
(inc-failures)
|
|
(print-failed srcinfo)
|
|
(for-each
|
|
(λ (v2) (fprintf (current-error-port) "expected: ~v\n" v2))
|
|
expected)
|
|
(for-each
|
|
(λ (v1) (fprintf (current-error-port) " actual: ~v\n" v1))
|
|
got))])))
|
|
|
|
(define (set-equal? s1 s2 equiv?)
|
|
(define (⊆ s1 s2) (andmap (λ (x1) (memf (λ (x) (equiv? x1 x)) s2)) s1))
|
|
(and (⊆ s1 s2)
|
|
(⊆ s2 s1)))
|
|
|
|
(define-syntax (test-predicate stx)
|
|
(syntax-case stx ()
|
|
[(_ p arg)
|
|
#`(test-predicate/proc p arg #,(get-srcloc stx))]))
|
|
|
|
(define (test-predicate/proc pred arg srcinfo)
|
|
(inc-tests)
|
|
(unless (pred arg)
|
|
(inc-failures)
|
|
(print-failed srcinfo)
|
|
(fprintf (current-error-port) " ~v does not hold for\n ~v\n"
|
|
pred arg)))
|
|
|
|
(define-syntax (test-equal stx)
|
|
(syntax-case stx ()
|
|
[(_ e1 e2)
|
|
#`(test-equal/proc e1 e2 #,(get-srcloc stx))]))
|
|
|
|
(define (test-equal/proc v1 v2 srcinfo)
|
|
(inc-tests)
|
|
(unless (equal? v1 v2)
|
|
(inc-failures)
|
|
(print-failed srcinfo)
|
|
(fprintf (current-error-port) " actual: ~v\n" v1)
|
|
(fprintf (current-error-port) "expected: ~v\n" v2)))
|
|
|
|
(define (print-failed srcinfo)
|
|
(let ([file (list-ref srcinfo 0)]
|
|
[line (list-ref srcinfo 1)]
|
|
[column (list-ref srcinfo 2)]
|
|
[pos (list-ref srcinfo 3)])
|
|
(fprintf (current-error-port)
|
|
"FAILED ~a~a\n"
|
|
(cond
|
|
[(path? file)
|
|
(let-values ([(base name dir) (split-path file)])
|
|
(path->string name))]
|
|
[else ""])
|
|
(cond
|
|
[(and line column)
|
|
(format ":~a.~a" line column)]
|
|
[pos
|
|
(format "::~a" pos)]
|
|
[else #f]))))
|
|
|
|
(provide (rename-out [-reduction-relation reduction-relation])
|
|
--> fresh with ;; keywords for reduction-relation
|
|
reduction-relation->rule-names
|
|
extend-reduction-relation
|
|
reduction-relation?
|
|
union-reduction-relations
|
|
|
|
compatible-closure
|
|
context-closure
|
|
|
|
define-language
|
|
define-extended-language
|
|
|
|
define-metafunction
|
|
define-metafunction/extension
|
|
define-relation
|
|
|
|
(rename-out [metafunction-form metafunction])
|
|
metafunction? metafunction-proc
|
|
in-domain?
|
|
current-traced-metafunctions
|
|
metafunc-proc-lang
|
|
metafunc-proc-pict-info
|
|
metafunc-proc-name
|
|
metafunc-proc-multi-arg?
|
|
metafunc-proc-in-dom?
|
|
metafunc-proc-dom-pat
|
|
metafunc-proc-cases
|
|
metafunc-proc?
|
|
(struct-out metafunc-case)
|
|
|
|
(struct-out metafunc-extra-side-cond)
|
|
(struct-out metafunc-extra-where)
|
|
(struct-out metafunc-extra-fresh)
|
|
|
|
(struct-out binds))
|
|
|
|
(provide test-match
|
|
term-match
|
|
term-match/single
|
|
make-bindings bindings-table bindings?
|
|
match? match-bindings
|
|
make-bind bind? bind-name bind-exp
|
|
make-match
|
|
|
|
test-equal
|
|
test-->>
|
|
test-->
|
|
test-predicate
|
|
test-results)
|
|
|
|
|
|
(provide language-nts
|
|
apply-reduction-relation
|
|
apply-reduction-relation/tag-with-names
|
|
apply-reduction-relation*
|
|
variable-not-in
|
|
variables-not-in)
|
|
|
|
(provide relation-coverage
|
|
covered-cases
|
|
(rename-out [fresh-coverage make-coverage])
|
|
coverage?)
|