2424 lines
112 KiB
Racket
2424 lines
112 KiB
Racket
#lang racket/base
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(require "matcher.rkt"
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"struct.rkt"
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"term.rkt"
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"fresh.rkt"
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"loc-wrapper.rkt"
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"error.rkt"
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"judgment-form.rkt"
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"term-fn.rkt"
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"search.rkt"
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"lang-struct.rkt"
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(for-syntax "cycle-check.rkt"
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setup/path-to-relative)
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racket/trace
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racket/contract
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racket/list
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racket/set
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data/union-find
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mzlib/etc)
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(require (for-syntax syntax/name
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"loc-wrapper-ct.rkt"
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"rewrite-side-conditions.rkt"
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"term-fn.rkt"
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"underscore-allowed.rkt"
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syntax/boundmap
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syntax/id-table
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racket/base
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racket/list
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syntax/parse
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syntax/parse/experimental/contract
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syntax/name
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racket/syntax))
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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 (term-matcher orig-stx make-matcher)
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(syntax-case orig-stx ()
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[(form-name lang [pattern rhs] ...)
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(begin
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(unless (identifier? #'lang)
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(raise-syntax-error (syntax-e #'form-name) "expected an identifier in the language position" orig-stx #'lang))
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(let ([lang-nts (language-id-nts #'lang (syntax-e #'form-name))])
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(with-syntax ([((side-conditions-rewritten (names ...) (names/ellipses ...)) ...)
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(map (λ (x) (rewrite-side-conditions/check-errs lang-nts (syntax-e #'form-name) #t x))
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(syntax->list (syntax (pattern ...))))]
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[(cp-x ...) (generate-temporaries #'(pattern ...))]
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[make-matcher make-matcher])
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#'(make-matcher
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'form-name lang
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(list 'pattern ...)
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(list (compile-pattern lang `side-conditions-rewritten #t) ...)
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(list (λ (match)
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(term-let/error-name
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form-name
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([names/ellipses (lookup-binding (mtch-bindings match) 'names)] ...)
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rhs)) ...)))))]))
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(define-syntax (term-match/single stx)
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(term-matcher stx #'term-match/single/proc))
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(define-syntax (term-match stx)
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(term-matcher stx #'term-match/proc))
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(define ((term-match/proc form-name lang ps cps rhss) term)
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(append-map
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(λ (cp rhs)
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(let ([matches (match-pattern cp term)])
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(if matches
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(map rhs matches)
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'())))
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cps rhss))
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(define ((term-match/single/proc form-name lang ps0 cps rhss) term)
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(let loop ([ps ps0] [cps cps] [rhss rhss])
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(if (null? ps)
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(redex-error form-name
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(if (null? (cdr ps0))
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(format "term ~s does not match pattern ~s" term (car ps0))
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(format "no patterns matched ~s" term)))
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(let ([match (match-pattern (car cps) term)])
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(if match
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(begin
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(unless (null? (cdr match))
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(redex-error
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form-name
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"pattern ~s matched term ~s multiple ways"
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(car ps)
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term))
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((car rhss) (car match)))
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(loop (cdr ps) (cdr cps) (cdr rhss)))))))
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(define-syntaxes (redex-let redex-let*)
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(let ()
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(define-syntax-class binding
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#:description "binding clause"
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(pattern (lhs:expr rhs:expr)))
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(define-syntax-class (bindings extract)
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#:description (if extract
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"sequence of disjoint binding clauses"
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"sequence of binding clauses")
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(pattern (b:binding ...)
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#:fail-when (and extract
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(check-duplicate-identifier
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(apply append (map extract (syntax->list #'(b.lhs ...))))))
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"duplicate pattern variable"
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#:with (lhs ...) #'(b.lhs ...)
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#:with (rhs ...) #'(b.rhs ...)))
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(define (redex-let stx)
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(define-values (form-name nts)
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(syntax-case stx ()
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[(name lang . _)
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(values (syntax-e #'name)
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(language-id-nts #'lang (syntax-e #'name)))]))
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(define (pattern-variables pattern)
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(let-values ([(names _) (extract-names nts form-name #t pattern)])
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names))
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(syntax-parse stx
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[(name lang (~var bs (bindings pattern-variables)) body ...+)
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(with-syntax ([(t ...) (generate-temporaries #'bs)])
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#`(let ([t bs.rhs] ...)
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#,(nested-lets #'lang #'([bs.lhs t] ...) #'(body ...) #'name)))]))
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(define (redex-let* stx)
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(syntax-parse stx
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[(name lang (~var bs (bindings #f)) body ...+)
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(nested-lets #'lang #'bs #'(body ...) #'name)]))
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(define (nested-lets lang bindings bodies name)
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(syntax-case bindings ()
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[()
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#`(let () #,@bodies)]
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[([lhs rhs] . bindings)
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(with-syntax ([rest-lets (nested-lets lang #'bindings bodies name)])
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#`(#,(term-matcher #`(#,name #,lang [lhs rest-lets])
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#'term-match/single/proc)
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rhs))]))
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(values redex-let redex-let*)))
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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 (names ...) (names/ellipses ...))
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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 (names ...) (names/ellipses ...))
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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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(let ([orig-pat (reduction-relation-domain-pat red)])
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(cond
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[(equal? orig-pat `any)
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;; special case for backwards compatibility:
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;; if there was no #:domain argument, then we
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;; probably should let the compatible closure also
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;; not have a domain
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`any]
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[else
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`(in-hole ,pat ,orig-pat)])))))
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(define (apply-reduction-relation/tagged 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 acc))])))
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(define (apply-reduction-relation/tag-with-names p v) (map cdr (apply-reduction-relation/tagged p v)))
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(define (apply-reduction-relation p v) (map caddr (apply-reduction-relation/tagged p v)))
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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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(define-for-syntax (generate-binding-constraints names names/ellipses bindings syn-err-name)
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(define (id/depth stx)
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(syntax-case stx ()
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[(s (... ...))
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(let ([r (id/depth #'s)])
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(make-id/depth (id/depth-id r) (add1 (id/depth-depth r)) (id/depth-mismatch? r)))]
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[s (make-id/depth #'s 0 #f)]))
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(define temporaries (generate-temporaries names))
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(values
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(for/fold ([cs '()])
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([n names]
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[w/e names/ellipses]
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[x temporaries])
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(cond [(hash-ref bindings (syntax-e n) #f)
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=> (λ (b)
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(let ([b-id/depth (id/depth b)]
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[n-id/depth (id/depth w/e)])
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(if (= (id/depth-depth b-id/depth) (id/depth-depth n-id/depth))
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(cons #`(equal? #,x (term #,b)) cs)
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(raise-ellipsis-depth-error
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syn-err-name
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(id/depth-id n-id/depth) (id/depth-depth n-id/depth)
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(id/depth-id b-id/depth) (id/depth-depth b-id/depth)))))]
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[else cs]))
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temporaries
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(for/fold ([extended bindings])
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([name names]
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[w/ellipses names/ellipses])
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(hash-set extended (syntax-e name) w/ellipses))))
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(define-for-syntax (check-judgment-arity stx judgment)
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(syntax-case judgment ()
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[(form-name pat ...)
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(judgment-form-id? #'form-name)
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(let ([expected (length (judgment-form-mode (lookup-judgment-form-id #'form-name)))]
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[actual (length (syntax->list #'(pat ...)))])
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(unless (= actual expected)
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(raise-syntax-error
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#f
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(format "mode specifies a ~a-ary relation but use supplied ~a term~a"
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expected actual (if (= actual 1) "" "s"))
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judgment)))]
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[(form-name pat ...)
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(raise-syntax-error #f "expected a judgment form name" stx #'form-name)]))
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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 (name-pattern-lws/rr pat)
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(for/list ([lw-pair (name-pattern-lws pat)])
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(if (pair? lw-pair)
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#`(cons #,(car lw-pair) #,(cdr lw-pair))
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(error 'name-pattern-lws/rr "ack"))))
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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 computed-label scs/withs fvars)
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(let loop ([stuffs (syntax->list #'(stuff ...))]
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[label #f]
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[computed-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 computed-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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computed-name
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judgment-holds)
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[(fresh xs ...)
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(loop (cdr stuffs)
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label
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computed-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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computed-label
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(cons #`(cons #,(to-lw/proc #'x) #,(to-lw/proc #'e))
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(append (name-pattern-lws/rr #'x) scs/withs))
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fvars)]
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[(where/hidden x e)
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(loop (cdr stuffs) label computed-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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computed-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 computed-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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computed-label
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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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#'(string->symbol x)
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computed-label
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scs/withs
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fvars)]
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[(computed-name e)
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(loop (cdr stuffs)
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label
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#'e
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scs/withs
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fvars)]
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[(judgment-holds (form-name . pieces))
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(judgment-form-id? #'form-name)
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(loop (cdr stuffs)
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label
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computed-label
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(let*-values ([(mode) (judgment-form-mode (lookup-judgment-form-id #'form-name))]
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[(_ outs) (split-by-mode (syntax->list #'pieces) mode)])
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(cons (to-lw/proc #'(form-name . pieces))
|
|
(for/fold ([binds scs/withs]) ([out outs])
|
|
(append (name-pattern-lws/rr out) binds))))
|
|
fvars)]
|
|
[_
|
|
;; just skip over junk here, and expect a syntax error to be raised elsewhere
|
|
(loop (cdr stuffs) label computed-label scs/withs fvars)])]))])
|
|
(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
|
|
#,(and computed-label
|
|
(to-lw/proc #`,#,computed-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 ...))))]
|
|
;; just skip over junk here, since syntax error checks elsewhere will catch this
|
|
[_ #f]))
|
|
|
|
(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 ([rule (in-list rules)])
|
|
(syntax-case rule ()
|
|
[(arrow . rst)
|
|
(begin
|
|
(unless (identifier? #'arrow)
|
|
(raise-syntax-error orig-name "expected a reduction relation arrow" stx #'arrow))
|
|
(set! all-top-levels (cons #'arrow all-top-levels))
|
|
(table-cons! ht (syntax arrow) rule))]))
|
|
|
|
;; 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 (names ...) (names/ellipses ...))
|
|
(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))])
|
|
(with-syntax ([(side-conditions-rewritten (names ...) (names/ellipses ...))
|
|
(rewrite-side-conds
|
|
(rewrite-node-pat (syntax-e (syntax lhs-frm-id))
|
|
(syntax rhs-from)))]
|
|
[(fresh-rhs-from (fresh-names ...) (fresh-names/ellipses ...))
|
|
(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 #:lang lang)))
|
|
#,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 'binds-anywhere)])
|
|
(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 computed-name sides/withs/freshs) (process-extras stx orig-name name-table extras)])
|
|
(with-syntax ([(side-conditions-rewritten (names ...) (names/ellipses ...)) (rw-sc from)])
|
|
(define body-code
|
|
(bind-withs orig-name
|
|
#'main-exp
|
|
lang
|
|
lang-nts
|
|
sides/withs/freshs
|
|
'flatten
|
|
#`(list (cons #,(or computed-name #'none)
|
|
(term #,to #:lang #,lang)))
|
|
(syntax->list #'(names ...))
|
|
(syntax->list #'(names/ellipses ...))
|
|
#t
|
|
#f))
|
|
(define test-case-body-code
|
|
;; this contains some redundant code
|
|
(bind-withs orig-name
|
|
#'#t
|
|
#'lang-id2
|
|
lang-nts
|
|
sides/withs/freshs
|
|
'predicate
|
|
#'#t
|
|
(syntax->list #'(names ...))
|
|
(syntax->list #'(names/ellipses ...))
|
|
#t
|
|
#f))
|
|
(with-syntax ([(lhs-w/extras (w/extras-names ...) (w/extras-names/ellipses ...))
|
|
(rw-sc #`(side-condition #,from #,test-case-body-code))]
|
|
[lhs-source (format "~a:~a:~a"
|
|
(and (path? (syntax-source from))
|
|
(path->relative-string/library (syntax-source from)))
|
|
(syntax-line from)
|
|
(syntax-column from))]
|
|
[name name]
|
|
[lang lang]
|
|
[body-code body-code])
|
|
#`
|
|
(build-rewrite-proc/leaf `side-conditions-rewritten
|
|
(λ (main-exp bindings)
|
|
(term-let ([names/ellipses (lookup-binding bindings 'names)] ...)
|
|
body-code))
|
|
lhs-source
|
|
name
|
|
(λ (lang-id2) `lhs-w/extras)))))))
|
|
|
|
(define (process-extras stx orig-name name-table extras)
|
|
(let* ([the-name #f]
|
|
[the-name-stx #f]
|
|
[computed-name-stx #f]
|
|
[sides/withs/freshs
|
|
(let loop ([extras extras])
|
|
(cond
|
|
[(null? extras) '()]
|
|
[else
|
|
(syntax-case (car extras) (fresh computed-name judgment-holds)
|
|
[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 ...)
|
|
(side-condition-keyword? #'-side-condition)
|
|
(cons (car extras) (loop (cdr extras)))]
|
|
[(-where x e)
|
|
(where-keyword? #'-where)
|
|
(cons (car extras) (loop (cdr extras)))]
|
|
[(-where . x)
|
|
(where-keyword? #'-where)
|
|
(raise-syntax-error orig-name "malformed where clause" stx (car extras))]
|
|
[(computed-name e)
|
|
(if computed-name-stx
|
|
(raise-syntax-errors orig-name "expected at most one computed-name clause"
|
|
stx (list computed-name-stx #'e))
|
|
(set! computed-name-stx #'e))
|
|
(loop (cdr extras))]
|
|
[(computed-name . _)
|
|
(raise-syntax-error orig-name "malformed computed-name clause" stx (car extras))]
|
|
[(judgment-holds judgment)
|
|
(begin
|
|
(check-judgment-arity stx #'judgment)
|
|
(cons #'judgment (loop (cdr extras))))]
|
|
[_
|
|
(raise-syntax-error orig-name "unknown extra" stx (car extras))])]))])
|
|
(values the-name computed-name-stx 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 (build-rewrite-proc/leaf side-conditions-rewritten
|
|
build-really-matched
|
|
lhs-source
|
|
name
|
|
lhs-w/extras-proc)
|
|
(let ([case-id (gensym)])
|
|
(make-rewrite-proc
|
|
(λ (lang-id)
|
|
(let ([cp (compile-pattern lang-id side-conditions-rewritten #t)])
|
|
(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 (build-really-matched main-exp bindings)])
|
|
(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
|
|
(if (none? (car x))
|
|
name
|
|
(format "~a" (car x)))
|
|
(f (cdr x))))
|
|
really-matched acc))]
|
|
[else
|
|
(loop (cdr mtchs) acc)]))]))
|
|
other-matches)))))
|
|
name
|
|
lhs-w/extras-proc
|
|
lhs-source
|
|
case-id)))
|
|
|
|
(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
|
|
(make-reduction-relation
|
|
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))
|
|
(reverse (apply append (map reduction-relation-procs lst)))
|
|
;; not clear what the contract is here.
|
|
`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)
|
|
(sort (hash-map (coverage-counts cov) (λ (k v) v))
|
|
string<=?
|
|
#:key car))
|
|
|
|
(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) (test-match/both stx #f))
|
|
(define-syntax (test-match? stx) (test-match/both stx #t))
|
|
|
|
(define-for-syntax (test-match/both stx boolean-only?)
|
|
(syntax-case stx ()
|
|
[(form-name lang-exp pattern)
|
|
(identifier? #'lang-exp)
|
|
(let*-values ([(what) (syntax-e #'form-name)]
|
|
[(nts) (language-id-nts #'lang-exp what)])
|
|
(with-syntax ([(side-condition-rewritten (vars ...) (ids/depths ...))
|
|
(rewrite-side-conditions/check-errs nts what #t #'pattern)])
|
|
(with-syntax ([binders (map syntax-e (syntax->list #'(vars ...)))]
|
|
[name (syntax-local-infer-name stx)])
|
|
#`(do-test-match lang-exp `side-condition-rewritten 'binders 'name #,boolean-only?))))]
|
|
[(form-name lang-exp pattern expression)
|
|
(identifier? #'lang-exp)
|
|
(syntax
|
|
((form-name 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 binders context-name boolean-only?)
|
|
(unless (compiled-lang? lang)
|
|
(error 'redex-match "expected first argument to be a language, got ~e" lang))
|
|
(define name (or context-name
|
|
(and (symbol? pat)
|
|
pat)))
|
|
(define cpat (compile-pattern lang pat #t))
|
|
(define redex-match-proc
|
|
(if boolean-only?
|
|
(λ (exp) (match-pattern? cpat exp))
|
|
(λ (exp)
|
|
(let ([ans (match-pattern cpat exp)])
|
|
(and ans
|
|
(map (λ (m) (make-match (sort-bindings
|
|
(filter (λ (x) (memq (bind-name x) binders))
|
|
(bindings-table (mtch-bindings m))))))
|
|
ans))))))
|
|
(if name
|
|
(procedure-rename redex-match-proc name)
|
|
redex-match-proc))
|
|
|
|
(define (sort-bindings bnds)
|
|
(sort
|
|
bnds
|
|
(λ (x y) (string-ci<=? (symbol->string (bind-name x))
|
|
(symbol->string (bind-name y))))))
|
|
|
|
(define-struct metafunction (proc))
|
|
|
|
(define-struct metafunc-case (lhs rhs lhs+ src-loc id) #:transparent)
|
|
|
|
(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-for-syntax (lhs-lws clauses)
|
|
(with-syntax ([((lhs-for-lw _ ...) ...) clauses])
|
|
(map (λ (x) (to-lw/proc (datum->syntax #f (cdr (syntax-e x)) x)))
|
|
(syntax->list #'(lhs-for-lw ...)))))
|
|
|
|
;
|
|
;
|
|
;
|
|
; ; ;;; ; ;;
|
|
; ;; ;;;; ;; ;;
|
|
; ;;;;;;; ;;;; ;;; ;;;;; ;;;;;;; ;;;;; ;;;; ;;;; ;;;; ;;; ;;;;; ;;;;; ;;;; ;;;; ;;;
|
|
; ;;;;;;;;;;;;; ;;;;; ;;;;;; ;;;;;;;; ;;;; ;;;; ;;;; ;;;;;;;;; ;;;;;; ;;;;;; ;;;; ;;;;;; ;;;;;;;;;
|
|
; ;;;; ;;; ;;;; ;;;; ;; ;;;; ;;;; ;;;;;; ;;;; ;;;; ;;;; ;;;; ;;;;;;; ;;;; ;;;; ;;;;;;;; ;;;; ;;;;
|
|
; ;;;; ;;; ;;;; ;;;;;;; ;;;; ;;;;;;; ;;;;;; ;;;; ;;;; ;;;; ;;;; ;;;; ;;;; ;;;; ;;;; ;;; ;;;; ;;;;
|
|
; ;;;; ;;; ;;;; ;;;;; ;;;;; ;; ;;;; ;;;; ;;;; ;;;; ;;;; ;;;; ;;;;;;; ;;;;; ;;;; ;;;;;;;; ;;;; ;;;;
|
|
; ;;;; ;;; ;;;; ;;;;;; ;;;;; ;;;;;;;; ;;;; ;;;;;;;;; ;;;; ;;;; ;;;;;; ;;;;; ;;;; ;;;;;; ;;;; ;;;;
|
|
; ;;;; ;;; ;;;; ;;;; ;;;; ;; ;;;; ;;;; ;;; ;;;; ;;;; ;;;; ;;;;; ;;;; ;;;; ;;;; ;;;; ;;;;
|
|
;
|
|
;
|
|
;
|
|
|
|
(define-syntax (define-metafunction stx)
|
|
(syntax-case stx ()
|
|
[(_ . rest)
|
|
(internal-define-metafunction stx #f #'rest)]))
|
|
|
|
(define-syntax (define-metafunction/extension stx)
|
|
(syntax-case stx ()
|
|
[(_ prev . rest)
|
|
(identifier? #'prev)
|
|
(internal-define-metafunction stx #'prev #'rest)]))
|
|
|
|
(define-for-syntax (internal-define-metafunction orig-stx prev-metafunction stx)
|
|
(not-expression-context orig-stx)
|
|
(syntax-case stx ()
|
|
[(lang . rest)
|
|
(let ([syn-error-name (if prev-metafunction
|
|
'define-metafunction/extension
|
|
'define-metafunction)])
|
|
;; keep this near the beginning, so it signals the first error (PR 10062)
|
|
(definition-nts #'lang orig-stx syn-error-name)
|
|
(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))))
|
|
(let*-values ([(contract-name dom-ctcs codom-contracts pats)
|
|
(split-out-contract orig-stx syn-error-name #'rest #f)]
|
|
[(name _) (defined-name (list contract-name) pats orig-stx)])
|
|
(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))
|
|
(with-syntax ([(name2 name-predicate) (generate-temporaries (list name name))]
|
|
[name name])
|
|
(with-syntax ([defs #`(begin
|
|
(define-values (name2 name-predicate)
|
|
(generate-metafunction #,orig-stx
|
|
lang
|
|
#,prev-metafunction
|
|
name
|
|
name-predicate
|
|
#,dom-ctcs
|
|
#,codom-contracts
|
|
#,pats
|
|
#,syn-error-name))
|
|
(term-define-fn name name2))])
|
|
(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))))))]))
|
|
|
|
(define-for-syntax (extract-clause-names stuffss)
|
|
(for/list ([stuffs (in-list (syntax->list stuffss))])
|
|
(define the-clause-name #f)
|
|
(define stuff-without-clause-name
|
|
(for/fold ([stuffs '()]) ([stuff+name (in-list (syntax->list stuffs))])
|
|
(syntax-case* stuff+name (clause-name) (λ (x y) (eq? (syntax-e x) (syntax-e y)))
|
|
[(clause-name id)
|
|
(begin
|
|
(unless (or (identifier? #'id)
|
|
(string? (syntax-e #'id)))
|
|
(raise-syntax-error 'define-metafunction
|
|
"expected an identifier or a string"
|
|
#'id))
|
|
(when the-clause-name
|
|
(raise-syntax-error 'define-metafunction
|
|
"multiple names in a single clause"
|
|
#f
|
|
#f
|
|
(list the-clause-name #'id)))
|
|
(set! the-clause-name #'id)
|
|
stuffs)]
|
|
[_ (cons stuff+name stuffs)])))
|
|
(cons (cond
|
|
[(not the-clause-name) #f]
|
|
[(identifier? the-clause-name) (symbol->string (syntax-e the-clause-name))]
|
|
[else the-clause-name])
|
|
(reverse stuff-without-clause-name))))
|
|
|
|
(define-syntax (generate-metafunction stx)
|
|
(syntax-case stx ()
|
|
[(_ orig-stx lang prev-metafunction name name-predicate dom-ctcs codom-contracts pats syn-error-name)
|
|
(let ([prev-metafunction (and (syntax-e #'prev-metafunction) #'prev-metafunction)]
|
|
[dom-ctcs (syntax-e #'dom-ctcs)]
|
|
[codom-contracts (syntax-e #'codom-contracts)]
|
|
[pats (syntax-e #'pats)]
|
|
[syn-error-name (syntax-e #'syn-error-name)])
|
|
(define lang-nts
|
|
(definition-nts #'lang #'orig-stx syn-error-name))
|
|
(with-syntax ([(((original-names lhs-clauses ...) raw-rhses ...) ...) pats]
|
|
[(lhs-for-lw ...) (lhs-lws pats)])
|
|
(with-syntax ([((rhs stuff+names ...) ...) #'((raw-rhses ...) ...)]
|
|
[(lhs ...) #'((lhs-clauses ...) ...)])
|
|
(with-syntax ([((clause-name stuff ...) ...) (extract-clause-names #'((stuff+names ...) ...))])
|
|
(parse-extras #'((stuff ...) ...))
|
|
(with-syntax ([((side-conditions-rewritten lhs-names lhs-namess/ellipses) ...)
|
|
(map (λ (x) (rewrite-side-conditions/check-errs
|
|
lang-nts
|
|
syn-error-name
|
|
#t
|
|
x))
|
|
(syntax->list (syntax (lhs ...))))])
|
|
(with-syntax ([(rhs/wheres ...)
|
|
(map (λ (sc/b rhs names names/ellipses)
|
|
(bind-withs
|
|
syn-error-name '()
|
|
#'effective-lang lang-nts
|
|
sc/b 'flatten
|
|
#`(list (term #,rhs #:lang lang))
|
|
(syntax->list names)
|
|
(syntax->list names/ellipses)
|
|
#t
|
|
#f))
|
|
(syntax->list #'((stuff ...) ...))
|
|
(syntax->list #'(rhs ...))
|
|
(syntax->list #'(lhs-names ...))
|
|
(syntax->list #'(lhs-namess/ellipses ...)))]
|
|
[(rg-rhs/wheres ...)
|
|
(map (λ (sc/b rhs names names/ellipses)
|
|
(bind-withs
|
|
syn-error-name '()
|
|
#'effective-lang lang-nts
|
|
sc/b 'predicate
|
|
#`#t
|
|
(syntax->list names)
|
|
(syntax->list names/ellipses)
|
|
#t
|
|
#f))
|
|
(syntax->list #'((stuff ...) ...))
|
|
(syntax->list #'(rhs ...))
|
|
(syntax->list #'(lhs-names ...))
|
|
(syntax->list #'(lhs-namess/ellipses ...)))])
|
|
(with-syntax ([((rg-side-conditions-rewritten rg-names rg-names/ellipses ...) ...)
|
|
(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"
|
|
(and (path? (syntax-source lhs))
|
|
(path->relative-string/library (syntax-source lhs)))
|
|
(syntax-line lhs)
|
|
(syntax-column lhs)))
|
|
pats)]
|
|
[(dom-side-conditions-rewritten dom-names dom-names/ellipses)
|
|
(if dom-ctcs
|
|
(rewrite-side-conditions/check-errs
|
|
lang-nts
|
|
syn-error-name
|
|
#f
|
|
dom-ctcs)
|
|
#'(any () ()))]
|
|
[((codom-side-conditions-rewritten codom-names codom-names/ellipses) ...)
|
|
(map (λ (codom-contract)
|
|
(rewrite-side-conditions/check-errs
|
|
lang-nts
|
|
syn-error-name
|
|
#f
|
|
codom-contract))
|
|
codom-contracts)]
|
|
[(rhs-fns ...)
|
|
(map (λ (names names/ellipses rhs/where)
|
|
(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 #'(lhs-names ...))
|
|
(syntax->list #'(lhs-namess/ellipses ...))
|
|
(syntax->list (syntax (rhs/wheres ...))))]
|
|
[((gen-clause lhs-pat lhs-ps/pat*) ...)
|
|
(make-mf-clauses (syntax->list #'(lhs ...))
|
|
(syntax->list #'(rhs ...))
|
|
(syntax->list #'((stuff ...) ...))
|
|
lang-nts syn-error-name #'name #'lang)])
|
|
(syntax-property
|
|
(prune-syntax
|
|
#`(let ([sc `(side-conditions-rewritten ...)]
|
|
[dsc `dom-side-conditions-rewritten])
|
|
(let ([cases (map (λ (pat rhs-fn rg-lhs src)
|
|
(make-metafunc-case
|
|
(λ (effective-lang) (compile-pattern effective-lang pat #t))
|
|
rhs-fn
|
|
rg-lhs src (gensym)))
|
|
sc
|
|
(list (λ (effective-lang) rhs-fns) ...)
|
|
(list (λ (effective-lang) `rg-side-conditions-rewritten) ...)
|
|
`(clause-src ...))]
|
|
[parent-cases
|
|
#,(if prev-metafunction
|
|
#`(metafunc-proc-cases #,(term-fn-get-id (syntax-local-value prev-metafunction)))
|
|
#'null)]
|
|
[new-lhs-pats '(lhs-pat ...)]
|
|
[new-lhs-ps/pats '(lhs-ps/pat* ...)])
|
|
|
|
(build-metafunction
|
|
lang
|
|
cases
|
|
parent-cases
|
|
(λ (f/dom)
|
|
(make-metafunc-proc
|
|
(let ([name (lambda (x) (f/dom x))]) name)
|
|
'(clause-name ...)
|
|
(generate-lws #f
|
|
(lhs ...)
|
|
(lhs-for-lw ...)
|
|
((stuff ...) ...)
|
|
(rhs ...)
|
|
#t)
|
|
lang
|
|
#t ;; multi-args?
|
|
'name
|
|
(let ([name (lambda (x) (name-predicate x))]) name)
|
|
dsc
|
|
(append cases parent-cases)
|
|
#,(cond
|
|
[prev-metafunction
|
|
#`(extend-mf-clauses #,(term-fn-get-id (syntax-local-value prev-metafunction))
|
|
(λ ()
|
|
#,(check-pats #'(list gen-clause ...)))
|
|
new-lhs-ps/pats)]
|
|
[else
|
|
#`(memoize0
|
|
(λ ()
|
|
#,(check-pats #'(list gen-clause ...))))])
|
|
#,(if prev-metafunction
|
|
#`(extend-lhs-pats #,(term-fn-get-id (syntax-local-value prev-metafunction))
|
|
new-lhs-pats)
|
|
#`new-lhs-pats)))
|
|
#,(if dom-ctcs #'dsc #f)
|
|
`(codom-side-conditions-rewritten ...)
|
|
'name))))
|
|
'disappeared-use
|
|
(map syntax-local-introduce
|
|
(syntax->list #'(original-names ...)))))))))))]))
|
|
|
|
(define (extend-lhs-pats old-m new-pats)
|
|
(append new-pats (metafunc-proc-lhs-pats old-m)))
|
|
|
|
(define (extend-mf-clauses old-mf new-clauses new-lhs-ps/pats)
|
|
(memoize0
|
|
(λ ()
|
|
(define old-clauses
|
|
(for/list ([old-clauses (in-list ((metafunc-proc-gen-clauses old-mf)))]
|
|
[old-lhs-pat (in-list (metafunc-proc-lhs-pats old-mf))])
|
|
(define new-dqs (for/list ([new-lhs-ps/pat (in-list new-lhs-ps/pats)])
|
|
(dqn (first new-lhs-ps/pat)
|
|
old-lhs-pat
|
|
(second new-lhs-ps/pat))))
|
|
(struct-copy clause old-clauses
|
|
[eq/dqs
|
|
(append
|
|
new-dqs
|
|
(clause-eq/dqs old-clauses))])))
|
|
(append
|
|
(new-clauses)
|
|
old-clauses))))
|
|
|
|
(define uniq (gensym))
|
|
(define (memoize0 t)
|
|
(let ([ans uniq])
|
|
(λ ()
|
|
(when (eq? ans uniq)
|
|
(set! ans (t)))
|
|
ans)))
|
|
|
|
(define-for-syntax (make-mf-clauses lhss rhss extrass nts err-name name lang)
|
|
(define-values (rev-clauses _1 _2)
|
|
(for/fold ([clauses '()] [prev-lhs-pats '()] [prev-lhs-pats* '()])
|
|
([lhs (in-list lhss)] [rhs (in-list rhss)] [extras (in-list extrass)])
|
|
(with-syntax* ([(lhs-pat (names ...) (names/ellipses ...)) (rewrite-side-conditions/check-errs nts err-name #t lhs)]
|
|
[((lhs-pat-ps* ...) lhs-pat*) (fix-and-extract-dq-vars #'lhs-pat)])
|
|
(define-values (ps-rw extra-eqdqs p-names)
|
|
(rewrite-prems #f (syntax->list extras) nts (syntax->datum #'(names ...)) 'define-metafunction))
|
|
(define-values (rhs-pats mf-clausess) (rewrite-terms (list rhs) p-names))
|
|
(define clause-stx
|
|
(with-syntax ([(prem-rw ...) ps-rw]
|
|
[(eqs ...) extra-eqdqs]
|
|
[(((prev-lhs-pat-ps ...) prev-lhs-pat) ...) prev-lhs-pats*]
|
|
[(mf-clauses ...) mf-clausess]
|
|
[(rhs-pat) rhs-pats])
|
|
#`((clause '(list lhs-pat rhs-pat)
|
|
(list eqs ... (dqn '(prev-lhs-pat-ps ...) 'prev-lhs-pat 'lhs-pat) ...)
|
|
(list prem-rw ... mf-clauses ...)
|
|
#,lang
|
|
'#,name)
|
|
lhs-pat
|
|
((lhs-pat-ps* ...) lhs-pat*))))
|
|
(values (cons clause-stx clauses)
|
|
(cons #'lhs-pat prev-lhs-pats)
|
|
(cons #'((lhs-pat-ps* ...) lhs-pat*) prev-lhs-pats*)))))
|
|
(reverse rev-clauses))
|
|
|
|
(define-for-syntax (fix-and-extract-dq-vars pat)
|
|
(define new-ids (hash))
|
|
(let recur ([pat pat])
|
|
(syntax-case pat (list name)
|
|
[(name vname p)
|
|
(with-syntax ([((vs ...) new-p) (recur #'p)]
|
|
[new-vn (datum->syntax #'vname
|
|
(let ([vn (syntax-e #'vname)])
|
|
(hash-ref new-ids vn
|
|
(λ ()
|
|
(define new
|
|
(syntax-e (generate-temporary (format "~s_" vn))))
|
|
(set! new-ids (hash-set new-ids vn new))
|
|
new)))
|
|
#'vname)])
|
|
#'((new-vn vs ...) (name new-vn new-p)))]
|
|
[(list ps ...)
|
|
(with-syntax* ([(((vs ...) new-ps) ...) (map recur (syntax->list #'(ps ...)))]
|
|
[(u-vs ...) (remove-duplicates (syntax->list #'(vs ... ...)) #:key syntax-e)])
|
|
#'((u-vs ...) (list new-ps ...)))]
|
|
[pat
|
|
#'(() pat)])))
|
|
|
|
(define-for-syntax (check-arity-consistency mode contracts full-def)
|
|
(when (and contracts (not (= (length mode) (length contracts))))
|
|
(raise-syntax-error
|
|
#f "mode and contract specify different numbers of positions" full-def)))
|
|
|
|
(define-for-syntax (defined-name declared-names clauses orig-stx)
|
|
(with-syntax ([(((used-names _ ...) _ ...) ...) clauses])
|
|
(define-values (the-name other-names)
|
|
(let ([present (filter values declared-names)])
|
|
(if (null? present)
|
|
(values (car (syntax->list #'(used-names ...)))
|
|
(cdr (syntax->list #'(used-names ...))))
|
|
(values (car present)
|
|
(append (cdr present) (syntax->list #'(used-names ...)))))))
|
|
(let loop ([others other-names])
|
|
(cond
|
|
[(null? others) (values the-name other-names)]
|
|
[else
|
|
(unless (eq? (syntax-e the-name) (syntax-e (car others)))
|
|
(raise-syntax-error
|
|
#f
|
|
"expected the same name in both positions"
|
|
orig-stx
|
|
the-name (list (car others))))
|
|
(loop (cdr others))]))))
|
|
|
|
|
|
(define-for-syntax (parse-extras extras)
|
|
(for-each
|
|
(λ (stuffs)
|
|
(for-each
|
|
(λ (stuff)
|
|
(syntax-case stuff (where side-condition where/hidden side-condition/hidden judgment-holds)
|
|
[(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)]
|
|
[(judgment-holds (form-name . _))
|
|
(unless (judgment-form-id? #'form-name)
|
|
(raise-syntax-error 'define-metafunction
|
|
"expected the name of a judgment-form"
|
|
#'form-name))]
|
|
[_
|
|
(raise-syntax-error 'define-metafunction
|
|
"expected a side-condition, where, or clause-name"
|
|
stuff)]))
|
|
(syntax->list stuffs)))
|
|
(syntax->list extras)))
|
|
|
|
|
|
(define (build-metafunction lang cases parent-cases wrap dom-contract-pat codom-contract-pats name)
|
|
(let* ([dom-compiled-pattern (and dom-contract-pat (compile-pattern lang dom-contract-pat #f))]
|
|
[codom-compiled-patterns (map (λ (codom-contract-pat) (compile-pattern lang codom-contract-pat #f))
|
|
codom-contract-pats)]
|
|
[all-cases (append cases parent-cases)]
|
|
[lhss-at-lang (map (λ (case) ((metafunc-case-lhs case) lang)) all-cases)]
|
|
[rhss-at-lang (map (λ (case) ((metafunc-case-rhs case) lang)) all-cases)]
|
|
[ids (map metafunc-case-id all-cases)])
|
|
(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 ([ids ids]
|
|
[lhss lhss-at-lang]
|
|
[rhss rhss-at-lang]
|
|
[num (- (length parent-cases))])
|
|
(cond
|
|
[(null? ids)
|
|
(redex-error name "no clauses matched for ~s" `(,name . ,exp))]
|
|
[else
|
|
(let ([pattern (car lhss)]
|
|
[rhs (car rhss)]
|
|
[id (car ids)]
|
|
[continue (λ () (loop (cdr ids) (cdr lhss) (cdr rhss) (+ num 1)))])
|
|
(let ([mtchs (match-pattern pattern exp)])
|
|
(cond
|
|
[(not mtchs) (continue)]
|
|
[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)
|
|
(continue)]
|
|
[(not (= 1 (hash-count ht)))
|
|
(redex-error name "~a matched ~s ~a returned different results"
|
|
(if (< num 0)
|
|
"a clause from an extended metafunction"
|
|
(format "clause #~a (counting from 0)" num))
|
|
`(,name ,@exp)
|
|
(if (= 1 (length mtchs))
|
|
"but"
|
|
(format "~a different ways and "
|
|
(length mtchs))))]
|
|
[else
|
|
(let ([ans (car anss)])
|
|
(unless (ormap (λ (codom-compiled-pattern)
|
|
(match-pattern codom-compiled-pattern ans))
|
|
codom-compiled-patterns)
|
|
(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)]
|
|
[otr (current-trace-print-results)]
|
|
[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)
|
|
(if (or (not (caching-enabled?))
|
|
(eq? not-in-cache (hash-ref cache exp not-in-cache)))
|
|
(display " ")
|
|
(display "c"))
|
|
(ot name (car args) kws kw-args level))]
|
|
[current-trace-print-results
|
|
(λ (name results level)
|
|
(display " ")
|
|
(otr name results level))]
|
|
[print-as-expression #f])
|
|
(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 (lhs) (match-pattern lhs exp)) lhss-at-lang)
|
|
#t))))))
|
|
|
|
(define-syntax (metafunction-form stx)
|
|
(syntax-case stx ()
|
|
[(_ id)
|
|
(identifier? #'id)
|
|
(let ([v (syntax-local-value #'id (lambda () #f))])
|
|
(if (term-fn? v)
|
|
(syntax-property
|
|
#`(make-metafunction #,(term-fn-get-id v))
|
|
'disappeared-use
|
|
(list (syntax-local-introduce #'id)))
|
|
(raise-syntax-error
|
|
#f
|
|
"not bound as a metafunction"
|
|
stx
|
|
#'id)))]))
|
|
|
|
(define-syntax (::= stx)
|
|
(raise-syntax-error #f "cannot be used outside a language definition" stx))
|
|
|
|
(define-for-syntax (parse-non-terminals nt-defs stx)
|
|
(define (parse-non-terminal def)
|
|
(define (delim? stx)
|
|
(and (identifier? stx) (free-identifier=? stx #'::=)))
|
|
(define-values (left delim right)
|
|
(syntax-case def ()
|
|
[(_ _ ...)
|
|
(let split ([xs def])
|
|
(syntax-case xs (::=)
|
|
[() (values '() #f '())]
|
|
[(x . prods)
|
|
(delim? #'x)
|
|
(values '() #'x (syntax->list #'prods))]
|
|
[(x . xs)
|
|
(let-values ([(l d r) (split #'xs)])
|
|
(values (cons #'x l) d r))]))]
|
|
[_ (raise-syntax-error #f "expected non-terminal definition" stx def)]))
|
|
(define (check-each xs bad? msg)
|
|
(define x (findf bad? xs))
|
|
(when x (raise-syntax-error #f msg stx x)))
|
|
(define-values (names prods)
|
|
(if delim
|
|
(begin
|
|
(when (null? left)
|
|
(raise-syntax-error #f "expected preceding non-terminal names" stx delim))
|
|
(values left right))
|
|
(values (syntax-case (car left) ()
|
|
[(x ...) (syntax->list #'(x ...))]
|
|
[x (list #'x)])
|
|
(cdr left))))
|
|
|
|
(check-each names (λ (x) (not (identifier? x)))
|
|
"expected non-terminal name")
|
|
(check-each names (λ (x) (memq (syntax-e x) (cons 'name underscore-allowed)))
|
|
"cannot use pattern language keyword as a non-terminal name")
|
|
(check-each names (λ (x) (regexp-match? #rx"_" (symbol->string (syntax-e x))))
|
|
"cannot use _ in a non-terminal name")
|
|
|
|
(when (null? prods)
|
|
(raise-syntax-error #f "expected at least one production to follow"
|
|
stx (or delim (car left))))
|
|
(check-each prods delim? "expected production")
|
|
(cons names prods))
|
|
(define parsed (map parse-non-terminal (syntax->list nt-defs)))
|
|
(define defs (make-hash))
|
|
(for ([p parsed])
|
|
(define ns (car p))
|
|
(for ([n ns])
|
|
(define m (hash-ref defs (syntax-e n) #f))
|
|
(if m
|
|
(raise-syntax-error #f "same non-terminal defined twice"
|
|
stx n (list m))
|
|
(hash-set! defs (syntax-e n) n))))
|
|
parsed)
|
|
|
|
(define-syntax (define-language stx)
|
|
(not-expression-context stx)
|
|
(syntax-case stx ()
|
|
[(form-name lang-name . nt-defs)
|
|
(begin
|
|
(unless (identifier? #'lang-name)
|
|
(raise-syntax-error #f "expected an identifier" stx #'lang-name))
|
|
(with-syntax ([(define-language-name) (generate-temporaries #'(lang-name))])
|
|
(let ([non-terms (parse-non-terminals #'nt-defs stx)])
|
|
(with-syntax ([((names prods ...) ...) non-terms]
|
|
[(all-names ...) (apply append (map car non-terms))])
|
|
(quasisyntax/loc stx
|
|
(begin
|
|
(define-syntax lang-name
|
|
(make-set!-transformer
|
|
(make-language-id
|
|
(λ (stx)
|
|
(syntax-case stx (set!)
|
|
[(set! x e) (raise-syntax-error (syntax-e #'form-name) "cannot set! identifier" stx #'e)]
|
|
[(x e (... ...))
|
|
#'(define-language-name e (... ...))]
|
|
[x
|
|
(identifier? #'x)
|
|
#'define-language-name]))
|
|
'(all-names ...))))
|
|
(define define-language-name
|
|
#,(syntax/loc stx (language form-name lang-name (all-names ...) (names prods ...) ...)))))))))]))
|
|
|
|
(define-struct binds (source binds))
|
|
|
|
(define-syntax (language stx)
|
|
(syntax-case stx ()
|
|
[(_ form-name lang-id (all-names ...) (name rhs ...) ...)
|
|
(prune-syntax
|
|
(let ()
|
|
(let ([all-names (syntax->list #'(all-names ...))])
|
|
(with-syntax ([(((r-rhs r-names r-names/ellipses) ...) ...)
|
|
(map (lambda (rhss)
|
|
(map (lambda (rhs)
|
|
(rewrite-side-conditions/check-errs
|
|
(map syntax-e all-names)
|
|
(syntax-e #'form-name)
|
|
#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 '()]))])
|
|
(check-for-cycles stx #'(name ...) #'((r-rhs ...) ...))
|
|
(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 '(nt orig-name)))) ...)
|
|
(mk-uf-sets '((uniform-names ...) ...))))))))))]))
|
|
|
|
|
|
(define-syntax (define-extended-language stx)
|
|
(syntax-case stx ()
|
|
[(_ name orig-lang . nt-defs)
|
|
(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))
|
|
(let ([old-names (language-id-nts #'orig-lang 'define-extended-language)]
|
|
[non-terms (parse-non-terminals #'nt-defs stx)])
|
|
(with-syntax ([((names prods ...) ...) non-terms]
|
|
[(all-names ...)
|
|
;; The names may have duplicates if the extended language
|
|
;; extends non-terminals in the parent language. They need
|
|
;; to be removed for `define-union-language`
|
|
(remove-duplicates
|
|
(apply append old-names (map car non-terms))
|
|
(λ (n1 n2)
|
|
(let ([n1 (if (syntax? n1) (syntax-e n1) n1)]
|
|
[n2 (if (syntax? n2) (syntax-e n2) n2)])
|
|
(eq? n1 n2))))]
|
|
[(define-language-name) (generate-temporaries #'(name))])
|
|
#'(begin
|
|
(define define-language-name (extend-language orig-lang (all-names ...) (names prods ...) ...))
|
|
(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]))
|
|
'(all-names ...))))))))]))
|
|
|
|
(define-syntax (extend-language stx)
|
|
(syntax-case stx ()
|
|
[(_ lang (all-names ...) (name rhs ...) ...)
|
|
(with-syntax ([(((r-rhs r-names r-names/ellipses) ...) ...)
|
|
(map (lambda (rhss) (map (λ (x) (rewrite-side-conditions/check-errs
|
|
(append (language-id-nts #'lang 'define-extended-language)
|
|
(map syntax-e
|
|
(syntax->list #'(all-names ...))))
|
|
'define-extended-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 ...) ...))))]
|
|
[((uniform-names ...) ...)
|
|
(map (λ (x) (if (identifier? x) (list x) x))
|
|
(syntax->list (syntax (name ...))))])
|
|
(syntax/loc stx
|
|
(do-extend-language lang
|
|
(list (make-nt '(uniform-names ...) (list (make-rhs `r-rhs) ...)) ...)
|
|
(list (list '(uniform-names ...) rhs/lw ...) ...))))]))
|
|
|
|
(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 'define-extended-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 'define-extended-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 'define-extended-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 'define-extended-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 `(nt ,(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))))
|
|
|
|
(define-syntax (define-union-language stx)
|
|
(syntax-case stx ()
|
|
[(_ name orig-langs ...)
|
|
(begin
|
|
(unless (identifier? (syntax name))
|
|
(raise-syntax-error 'define-extended-language "expected an identifier" stx #'name))
|
|
(when (null? (syntax->list #'(orig-langs ...)))
|
|
(raise-syntax-error 'define-union-language "expected at least one additional language" stx))
|
|
;; normalized-orig-langs : (listof (list string[prefix] id (listof symbol)[nts] stx[orig clause in union]))
|
|
(define normalized-orig-langs
|
|
(for/list ([orig-lang (in-list (syntax->list #'(orig-langs ...)))])
|
|
(syntax-case orig-lang ()
|
|
[x (identifier? #'x) (list #f #'x (language-id-nts #'x 'define-union-language) orig-lang)]
|
|
[(prefix lang)
|
|
(and (identifier? #'prefix)
|
|
(identifier? #'lang))
|
|
(list (symbol->string (syntax-e #'prefix)) #'lang (language-id-nts #'lang 'define-union-language) orig-lang)]
|
|
[else (raise-syntax-error 'define-union-language
|
|
"malformed additional language"
|
|
stx orig-lang)])))
|
|
|
|
;; ht : sym -o> (listof stx)
|
|
;; maps each non-terminal (with its prefix) to a
|
|
;; list of syntax objects that they come from in the original
|
|
;; define-union-language declaration
|
|
(define names-table (make-hash))
|
|
|
|
(for ([normalized-orig-lang (in-list normalized-orig-langs)])
|
|
(define prefix (list-ref normalized-orig-lang 0))
|
|
(for ([no-prefix-nt (in-list (list-ref normalized-orig-lang 2))])
|
|
(define nt (string->symbol (string-append (or prefix "")
|
|
(symbol->string no-prefix-nt))))
|
|
(let ([prev (hash-ref names-table nt '())])
|
|
(hash-set! names-table nt (cons (list-ref normalized-orig-lang 3) prev)))))
|
|
|
|
(with-syntax ([(all-names ...) (sort (hash-map names-table (λ (x y) x)) string<=? #:key symbol->string)]
|
|
[((prefix old-lang _1 _2) ...) normalized-orig-langs]
|
|
[(define-language-name) (generate-temporaries #'(name))])
|
|
#'(begin
|
|
(define define-language-name (union-language (list (list 'prefix old-lang) ...)))
|
|
(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]))
|
|
'(all-names ...)))))))]))
|
|
|
|
(define (union-language old-langs/prefixes)
|
|
|
|
(define (add-prefix prefix sym)
|
|
(if prefix
|
|
(string->symbol
|
|
(string-append prefix
|
|
(symbol->string sym)))
|
|
sym))
|
|
|
|
;; nt-maps-with-prefixes : (listof hash[symbol -o> uf-set?])
|
|
;; add prefixes on the canonical elements and in the
|
|
;; hash-table domains
|
|
(define nt-maps-with-prefixes
|
|
(for/list ([old-pr (in-list old-langs/prefixes)])
|
|
(define prefix (list-ref old-pr 0))
|
|
(define nt-map (compiled-lang-nt-map (list-ref old-pr 1)))
|
|
(cond
|
|
[prefix
|
|
(define already-prefixed '())
|
|
(for/hash ([(nt a-uf-set) (in-hash nt-map)])
|
|
(define already-prefixed?
|
|
(for/or ([x (in-list already-prefixed)])
|
|
(uf-same-set? x a-uf-set)))
|
|
(unless already-prefixed?
|
|
(uf-set-canonical! a-uf-set (add-prefix prefix (uf-find a-uf-set)))
|
|
(set! already-prefixed (cons a-uf-set already-prefixed)))
|
|
(values (add-prefix prefix nt) a-uf-set))]
|
|
[else nt-map])))
|
|
|
|
;; combine all of the nt-maps into a single one,
|
|
;; unioning the sets as approrpriate
|
|
(define new-nt-map (car nt-maps-with-prefixes))
|
|
(for ([nt-map (in-list (cdr nt-maps-with-prefixes))])
|
|
(for ([(k this-uf-set) (in-hash nt-map)])
|
|
(define final-uf-set (hash-ref new-nt-map k #f))
|
|
(cond
|
|
[final-uf-set
|
|
(uf-union! final-uf-set this-uf-set)]
|
|
[else
|
|
(set! new-nt-map (hash-set new-nt-map k this-uf-set))])))
|
|
|
|
(define names-table (make-hash))
|
|
(for ([old-lang/prefix (in-list old-langs/prefixes)])
|
|
(define prefix (list-ref old-lang/prefix 0))
|
|
(define lang (compiled-lang-lang (list-ref old-lang/prefix 1)))
|
|
(for ([nt (in-list lang)])
|
|
(define name (add-prefix prefix (nt-name nt)))
|
|
(define new-rhses
|
|
(for/set ([rhs (in-list (nt-rhs nt))])
|
|
(if prefix
|
|
(make-rhs (prefix-nts prefix (rhs-pattern rhs)))
|
|
rhs)))
|
|
(hash-set! names-table
|
|
name
|
|
(set-union new-rhses (hash-ref names-table name (set))))))
|
|
|
|
(compile-language #f
|
|
(hash-map names-table (λ (name set) (make-nt name (set->list set))))
|
|
new-nt-map))
|
|
|
|
|
|
;; 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)
|
|
(define uf/f (hash-ref (compiled-lang-nt-map lang) nt #f))
|
|
(and uf/f
|
|
(uf-find uf/f)))
|
|
|
|
(define (apply-reduction-relation* reductions exp
|
|
#:cache-all? [cache-all? (current-cache-all?)]
|
|
#:stop-when [stop-when (λ (x) #f)])
|
|
(let-values ([(results cycle?) (traverse-reduction-graph reductions exp
|
|
#:cache-all? cache-all?
|
|
#:stop-when stop-when)])
|
|
results))
|
|
|
|
(struct search-success ())
|
|
(struct search-failure (cutoff?))
|
|
|
|
;; traverse-reduction-graph :
|
|
;; reduction-relation term #:goal (-> any boolean?) #:steps number? #:visit (-> any/c void?) -> (or/c search-success? search-failure?)
|
|
;; reduction-relation term #:goal #f #:steps number? #:visit (-> any/c void?) -> (values (listof any/c) boolean?)
|
|
(define (traverse-reduction-graph reductions start #:goal [goal? #f] #:steps [steps +inf.0] #:visit [visit void]
|
|
#:cache-all? [cache-all? (current-cache-all?)]
|
|
#:stop-when [stop-when (λ (x) #f)])
|
|
(define visited (and cache-all? (make-hash)))
|
|
(let/ec return
|
|
(let ([answers (make-hash)]
|
|
[cycle? #f]
|
|
[cutoff? #f])
|
|
(let loop ([term start]
|
|
;; It would be better to record all visited terms, to avoid traversing
|
|
;; any part of the graph multiple times. Results from
|
|
;; collects/redex/trie-experiment
|
|
;; in commit
|
|
;; 152084d5ce6ef49df3ec25c18e40069950146041
|
|
;; suggest that a hash works better than a trie.
|
|
[path (make-immutable-hash '())]
|
|
[more-steps steps])
|
|
(if (and goal? (goal? term))
|
|
(return (search-success))
|
|
(cond
|
|
[(hash-ref path term #f)
|
|
(set! cycle? #t)]
|
|
[else
|
|
(visit term)
|
|
(cond
|
|
[(stop-when term)
|
|
(unless goal?
|
|
(hash-set! answers term #t))]
|
|
[else
|
|
(define nexts (apply-reduction-relation reductions term))
|
|
(cond
|
|
[(null? nexts)
|
|
(unless goal?
|
|
(hash-set! answers term #t))]
|
|
[else (if (zero? more-steps)
|
|
(set! cutoff? #t)
|
|
(for ([next (in-list (remove-duplicates nexts))])
|
|
(when (or (not visited)
|
|
(not (hash-ref visited next #f)))
|
|
(when visited (hash-set! visited next #t))
|
|
(loop next
|
|
(hash-set path term #t)
|
|
(sub1 more-steps)))))])])])))
|
|
(if goal?
|
|
(search-failure cutoff?)
|
|
(values (sort (hash-map answers (λ (x y) x))
|
|
string<=?
|
|
#:key (λ (x) (format "~s" x)))
|
|
cycle?)))))
|
|
|
|
(define current-cache-all? (make-parameter #f))
|
|
|
|
;; 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
|
|
'#,(and (path? (syntax-source stx))
|
|
(path->relative-string/library (syntax-source stx)))
|
|
'#,(syntax-line stx)
|
|
'#,(syntax-column stx)
|
|
'#,(syntax-position stx)))
|
|
|
|
(define-for-syntax test-equiv-ctc
|
|
#'(-> any/c any/c any/c))
|
|
(define-for-syntax test-equiv-name
|
|
"#:equiv argument")
|
|
(define-for-syntax test-equiv-default
|
|
#'equal?)
|
|
|
|
(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 argument")
|
|
(~optional (~seq #:equiv equiv?)
|
|
#:defaults ([equiv?.c test-equiv-default])
|
|
#:name test-equiv-name)
|
|
(~optional (~seq #:pred pred)
|
|
#:defaults ([pred #f])
|
|
#:name "#:pred argument"))
|
|
...
|
|
e1:expr
|
|
e2:expr ...)
|
|
#:declare equiv? (expr/c test-equiv-ctc #:name test-equiv-name)
|
|
#`(test-->>/procs 'test-->> red e1 (list e2 ...)
|
|
traverse-reduction-graph
|
|
#,(attribute cycles-ok?)
|
|
equiv?.c
|
|
#,(attribute pred)
|
|
#,(get-srcloc stx))]))
|
|
|
|
(define-syntax (test--> stx)
|
|
(syntax-parse stx
|
|
[(form red:expr
|
|
(~optional (~seq #:equiv equiv?)
|
|
#:defaults ([equiv?.c test-equiv-default]))
|
|
e1:expr
|
|
e2:expr ...)
|
|
#:declare equiv? (expr/c test-equiv-ctc #:name test-equiv-name)
|
|
#`(test-->>/procs 'test--> red e1 (list e2 ...) apply-reduction-relation/dummy-second-value #t equiv?.c #f #,(get-srcloc stx))]))
|
|
|
|
(define (apply-reduction-relation/dummy-second-value red arg #:visit visit)
|
|
(values (apply-reduction-relation red arg) #f))
|
|
|
|
(define (test-->>/procs name red arg expected apply-red cycles-ok? equiv? pred srcinfo)
|
|
(unless (reduction-relation? red)
|
|
(error name "expected a reduction relation as first argument, got ~e" red))
|
|
(when pred
|
|
(unless (and (procedure? pred)
|
|
(procedure-arity-includes? pred 1))
|
|
(error 'test-->> "expected a procedure that accepted one argument for the #:pred, got ~e" pred)))
|
|
(inc-tests)
|
|
(define visit-already-failed? #f)
|
|
(define (visit t)
|
|
(when pred
|
|
(unless visit-already-failed?
|
|
(unless (pred t)
|
|
(set! visit-already-failed? #t)
|
|
(inc-failures)
|
|
(print-failed srcinfo)
|
|
(eprintf "found a term that failed #:pred: ~v\n" t)))))
|
|
(let-values ([(got got-cycle?) (apply-red red arg #:visit visit)])
|
|
|
|
(cond
|
|
[(and got-cycle?
|
|
(not cycles-ok?))
|
|
(inc-failures)
|
|
(print-failed srcinfo)
|
|
(eprintf "found a cycle in the reduction graph\n")]
|
|
[else
|
|
(unless visit-already-failed?
|
|
(let* ([⊆ (λ (s1 s2) (andmap (λ (x1) (memf (λ (x) (equiv? x1 x)) s2)) s1))]
|
|
[set-equal? (λ (s1 s2) (and (⊆ s1 s2) (⊆ s2 s1)))])
|
|
(unless (set-equal? expected got)
|
|
(inc-failures)
|
|
(print-failed srcinfo)
|
|
(for-each
|
|
(λ (v2) (eprintf "expected: ~v\n" v2))
|
|
expected)
|
|
(if (empty? got)
|
|
(eprintf "got nothing\n")
|
|
(for-each
|
|
(λ (v1) (eprintf " actual: ~v\n" v1))
|
|
got)))))])))
|
|
|
|
(define-syntax (test-->>∃ stx)
|
|
(syntax-parse stx
|
|
[(form (~optional (~seq #:steps steps) #:defaults ([steps.c #'1000]))
|
|
relation
|
|
start:expr
|
|
goal)
|
|
#:declare relation (expr/c #'reduction-relation?
|
|
#:name "reduction relation expression")
|
|
#:declare goal (expr/c #'(or/c (-> any/c any/c) (not/c procedure?))
|
|
#:name "goal expression")
|
|
#:declare steps (expr/c #'(or/c natural-number/c +inf.0)
|
|
#:name "steps expression")
|
|
#`(test-->>∃/proc relation.c start goal.c steps.c #,(get-srcloc stx))]))
|
|
|
|
(define (test-->>∃/proc relation start goal steps srcinfo)
|
|
(let ([result (traverse-reduction-graph
|
|
relation
|
|
start
|
|
#:goal (if (procedure? goal) goal (λ (x) (equal? goal x)))
|
|
#:steps steps)])
|
|
(inc-tests)
|
|
(when (search-failure? result)
|
|
(print-failed srcinfo)
|
|
(inc-failures)
|
|
(begin
|
|
(if (procedure? goal)
|
|
(eprintf "no term satisfying ~a reachable from ~a" goal start)
|
|
(eprintf "term ~a not reachable from ~a" goal start))
|
|
(when (search-failure-cutoff? result)
|
|
(eprintf " (within ~a steps)" steps))
|
|
(newline (current-error-port))))))
|
|
|
|
(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)
|
|
(eprintf " ~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)
|
|
(eprintf " actual: ~v\n" v1)
|
|
(eprintf "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)])
|
|
(eprintf "FAILED ~a~a\n"
|
|
(cond
|
|
[(string? file) file]
|
|
[else ""])
|
|
(cond
|
|
[(and line column)
|
|
(format ":~a.~a" line column)]
|
|
[pos
|
|
(format "::~a" pos)]
|
|
[else #f]))))
|
|
|
|
(provide (rename-out [-reduction-relation reduction-relation])
|
|
::=
|
|
reduction-relation->rule-names
|
|
extend-reduction-relation
|
|
reduction-relation?
|
|
union-reduction-relations
|
|
|
|
compatible-closure
|
|
context-closure
|
|
|
|
define-language
|
|
define-extended-language
|
|
define-union-language
|
|
|
|
define-metafunction
|
|
define-metafunction/extension
|
|
define-relation
|
|
|
|
(rename-out [metafunction-form metafunction])
|
|
metafunction? metafunction-proc
|
|
in-domain?
|
|
metafunc-proc-lang
|
|
metafunc-proc-clause-names
|
|
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 binds))
|
|
|
|
(provide test-match
|
|
test-match?
|
|
term-match
|
|
term-match/single
|
|
redex-let
|
|
redex-let*
|
|
make-bindings bindings-table bindings?
|
|
match? match-bindings
|
|
make-bind bind? bind-name bind-exp
|
|
make-match
|
|
|
|
test-equal
|
|
test-->>
|
|
test-->
|
|
test-->>∃ (rename-out [test-->>∃ test-->>E])
|
|
test-predicate
|
|
test-results)
|
|
|
|
|
|
(provide language-nts
|
|
apply-reduction-relation
|
|
apply-reduction-relation/tag-with-names
|
|
apply-reduction-relation/tagged
|
|
apply-reduction-relation*
|
|
current-cache-all?
|
|
variable-not-in
|
|
variables-not-in)
|
|
|
|
(provide relation-coverage
|
|
covered-cases
|
|
(rename-out [fresh-coverage make-coverage])
|
|
coverage?)
|
|
|
|
(provide do-test-match)
|