Added unstable/cce/match macros to unstable/match.
This commit is contained in:
Carl Eastlund
parent
6bcf77fe65
commit
a22a1a4c15
24
collects/tests/unstable/match.rkt
Normal file
24
collects/tests/unstable/match.rkt
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@ -0,0 +1,24 @@
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#lang racket
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(require unstable/match rackunit rackunit/text-ui "helpers.rkt")
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(run-tests
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(test-suite "match.ss"
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(test-suite "match?"
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(test
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(check-true (match? (list 1 2 3)
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(list a b c)
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(vector x y z))))
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(test
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(check-true (match? (vector 1 2 3)
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(list a b c)
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(vector x y z))))
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(test
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(check-false (match? (+ 1 2 3)
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(list a b c)
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(vector x y z)))))
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(test-suite "as"
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(test
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(match (list 1 2 3)
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[(as ([a 0]) (list b c d)) (list a b c d)])
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(list 0 1 2 3)))))
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@ -1,127 +0,0 @@
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#lang scheme
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(require
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(for-syntax scheme/match
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scheme/struct-info
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unstable/function
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"define.ss"
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"syntax.ss"))
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(define-syntax-rule (match? e p ...)
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(match e [p #t] ... [_ #f]))
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(define-syntax (define-struct-pattern stx)
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(parameterize ([current-syntax stx])
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(syntax-case stx ()
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[(_ pattern-name struct-name)
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(block
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(define pattern-id #'pattern-name)
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(define struct-id #'struct-name)
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(unless (identifier? pattern-id)
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(syntax-error pattern-id "expected an identifier"))
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(unless (identifier? struct-id)
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(syntax-error struct-id "expected an identifier"))
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(define struct-info (syntax-local-value struct-id))
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(unless (struct-info? struct-info)
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(syntax-error struct-id "expected a struct name"))
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(match (extract-struct-info struct-info)
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[(list type-id
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constructor-id
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predicate-id
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accessor-ids
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mutator-ids
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super-id)
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(with-syntax ([make constructor-id]
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[(p ...) (generate-temporaries accessor-ids)])
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(syntax/loc stx
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(define-match-expander pattern-name
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(syntax-rules ()
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[(_ p ...) (struct struct-name [p ...])])
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(redirect-transformer #'make))))]))])))
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(define-for-syntax (get-struct-info id)
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(block
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(define (fail)
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(syntax-error id "expected a structure name"))
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(define value
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(syntax-local-value id fail))
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(unless (struct-info? value) (fail))
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(extract-struct-info value)))
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(define-for-syntax (struct-match-expander stx)
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(parameterize ([current-syntax stx])
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(syntax-case stx ()
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[(_ s f ...)
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(match (get-struct-info #'s)
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[(list _
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_
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(? identifier? pred)
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(list-rest (? identifier? rev-gets) ... (or (list) (list #f)))
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_
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_)
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(let* ([n-patterns (length (syntax-list f ...))]
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[n-fields (length rev-gets)])
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(unless (= n-patterns n-fields)
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(syntax-error #'s
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"got ~a patterns for ~a fields of ~a"
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n-patterns n-fields (syntax-e #'s))))
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(with-syntax ([pred? pred]
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[(get ...) (reverse rev-gets)])
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(syntax/loc stx
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(and (? pred?) (app get f) ...)))]
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[_
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(syntax-error
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#'s
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"expected a structure name with predicate and ~a fields; got ~a"
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(length (syntax-list f ...))
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(syntax-e #'s))])])))
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(define-for-syntax (struct-make-expander stx)
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(parameterize ([current-syntax stx])
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(syntax-case stx ()
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[(_ s f ...)
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(match (get-struct-info #'s)
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[(list _
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(? identifier? make)
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_
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rev-gets
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_
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_)
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(match rev-gets
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[(list (? identifier?) ...)
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(let* ([n-fields (length rev-gets)]
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[n-exprs (length (syntax-list f ...))])
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(unless (= n-exprs n-fields)
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(syntax-error
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#'s
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"got ~a arguments for ~a fields in structure ~a"
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n-exprs n-fields (syntax-e #'s))))]
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[_ (void)])
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(with-syntax ([mk make])
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(syntax/loc stx
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(mk f ...)))]
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[_
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(syntax-error
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#'s
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"expected a structure name with constructor; got ~a"
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(syntax-e #'s))])])))
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(define-match-expander $
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;; define-match-expander is STUPIDLY non-uniform about variable expressions
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(identity struct-match-expander)
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(identity struct-make-expander))
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(define-match-expander as
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(syntax-rules ()
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[(as ([x e] ...) p ...) (and (app (lambda (y) e) x) ... p ...)]))
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(provide match? define-struct-pattern $ as)
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@ -23,8 +23,6 @@
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@include-section["syntax.scrbl"]
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@include-section["define.scrbl"]
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@include-section["match.scrbl"]
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@include-section["class.scrbl"]
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@include-section["contract.scrbl"]
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@ -1,81 +0,0 @@
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#lang scribble/doc
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@(require scribble/manual
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scribble/eval
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"../scribble.ss"
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"eval.ss")
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@(require (for-label scheme unstable/cce/match))
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@title[#:style 'quiet #:tag "cce-match"]{Pattern Matching}
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@defmodule[unstable/cce/match]
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This module provides tools for pattern matching with @scheme[match].
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@defform[(match? val-expr pat ...)]{
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Returns @scheme[#t] if the result of @scheme[val-expr] matches any of
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@scheme[pat], and returns @scheme[#f] otherwise.
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@defexamples[
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#:eval (evaluator 'unstable/cce/match)
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(match? (list 1 2 3)
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(list a b c)
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(vector x y z))
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(match? (vector 1 2 3)
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(list a b c)
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(vector x y z))
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(match? (+ 1 2 3)
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(list a b c)
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(vector x y z))
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]
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}
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@defform[(define-struct-pattern pat-id struct-id)]{
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Defines @scheme[pat-id] as a match expander that takes one pattern argument per
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field of the structure described by @scheme[struct-id]. The resulting match
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expander recognizes instances of the structure and matches their fields against
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the corresponding patterns.
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@defexamples[
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#:eval (evaluator 'unstable/cce/match)
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(define-struct pair [a b] #:transparent)
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(define-struct-pattern both pair)
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(match (make-pair 'left 'right)
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[(both a b) (list a b)])
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]
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}
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@defform[(as ([lhs-id rhs-expr] ...) pat ...)]{
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As a match expander, binds each @scheme[lhs-id] as a pattern variable with the
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result value of @scheme[rhs-expr], and continues matching each subsequent
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@scheme[pat].
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@defexamples[
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#:eval (evaluator 'unstable/cce/match)
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(match (list 1 2 3)
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[(as ([a 0]) (list b c d)) (list a b c d)])
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]
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}
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@defform*[[($ struct-id expr ...) ($ struct-id pat ...)]]{
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As an expression, constructs an instance of the structure described by
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@scheme[struct-id] with fields specified by each @scheme[expr].
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As a match expander, matches instances of the structure described by
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@scheme[struct-id] with fields matched by each @scheme[pat].
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@defexamples[
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#:eval (evaluator 'unstable/cce/match)
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(define-struct pair [a b] #:transparent)
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($ pair 1 2)
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(match ($ pair 1 2)
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[($ pair a b) (list a b)])
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]
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}
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@ -8,7 +8,6 @@
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"test-dict.ss"
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"test-exn.ss"
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"test-hash.ss"
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"test-match.ss"
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"test-planet.ss"
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"test-port.ss"
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"test-queue.ss"
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@ -30,7 +29,6 @@
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dict-suite
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exn-suite
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hash-suite
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match-suite
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planet-suite
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port-suite
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queue-suite
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@ -1,45 +0,0 @@
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#lang scheme
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(require "checks.ss"
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"../match.ss")
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(provide match-suite)
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(define match-suite
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(test-suite "match.ss"
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(test-suite "match?"
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(test
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(check-true (match? (list 1 2 3)
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(list a b c)
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(vector x y z))))
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(test
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(check-true (match? (vector 1 2 3)
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(list a b c)
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(vector x y z))))
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(test
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(check-false (match? (+ 1 2 3)
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(list a b c)
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(vector x y z)))))
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(test-suite "define-struct-pattern"
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(test
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(let ()
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(define-struct pair [a b] #:transparent)
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(define-struct-pattern both pair)
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(check-equal?
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(match (make-pair 1 2)
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[(both a b) (list a b)])
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(list 1 2)))))
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(test-suite "as"
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(test
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(match (list 1 2 3)
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[(as ([a 0]) (list b c d)) (list a b c d)])
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(list 0 1 2 3)))
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(test-suite "$"
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(test
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(let ()
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(define-struct pair [a b] #:transparent)
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(check-equal? ($ pair 1 2) (make-pair 1 2))
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(check-equal?
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(match ($ pair 1 2)
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[($ pair a b) (list a b)])
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(list 1 2)))))))
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@ -2,7 +2,7 @@
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(require racket/match (for-syntax racket/base))
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(provide ==)
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(provide == match? as)
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(define-match-expander
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==
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@ -11,3 +11,10 @@
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[(_ val comp)
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#'(? (lambda (x) (comp val x)))]
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[(_ val) #'(== val equal?)])))
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(define-syntax-rule (match? e p ...)
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(match e [p #t] ... [_ #f]))
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(define-match-expander as
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(syntax-rules ()
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[(as ([x e] ...) p ...) (and (app (lambda (y) e) x) ... p ...)]))
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@ -1,7 +1,5 @@
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#lang scribble/doc
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@(require scribble/base
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scribble/manual
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scribble/eval
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#lang scribble/manual
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@(require scribble/eval
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"utils.rkt"
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(for-label unstable/match
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racket/match
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@ -35,3 +33,39 @@ not provided, it defaults to @racket[equal?].
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[_ 'no])
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]
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}
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@addition[@author+email["Carl Eastlund" "cce@racket-lang.org"]]
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@defform[(match? val-expr pat ...)]{
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Returns @scheme[#t] if the result of @scheme[val-expr] matches any of
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@scheme[pat], and returns @scheme[#f] otherwise.
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@defexamples[
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#:eval (eval/require 'racket/match 'unstable/match)
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(match? (list 1 2 3)
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(list a b c)
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(vector x y z))
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(match? (vector 1 2 3)
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(list a b c)
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(vector x y z))
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(match? (+ 1 2 3)
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(list a b c)
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(vector x y z))
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]
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}
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@defform[(as ([lhs-id rhs-expr] ...) pat ...)]{
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As a match expander, binds each @scheme[lhs-id] as a pattern variable with the
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result value of @scheme[rhs-expr], and continues matching each subsequent
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@scheme[pat].
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@defexamples[
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#:eval (eval/require 'racket/match 'unstable/match)
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(match (list 1 2 3)
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[(as ([a 0]) (list b c d)) (list a b c d)])
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]
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}
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