3e63caa887
added syntax/parse library and documentation added syntax/id-table library and documentation svn: r15376
88 lines
3.2 KiB
Scheme
88 lines
3.2 KiB
Scheme
#lang scheme/base
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(require "sc.ss"
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"../util.ss"
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syntax/stx
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syntax/kerncase
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scheme/struct-info
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scheme/private/contract-helpers
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(for-syntax scheme/base
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syntax/kerncase
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"rep.ss"
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(only-in "rep-data.ss" make-literalset))
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(for-template scheme/base
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scheme/contract))
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(provide (all-defined-out))
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(define-syntax-rule (define-pred-stxclass name pred)
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(define-syntax-class name #:attributes ()
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(pattern x
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#:fail-unless (pred (syntax-e #'x)) #f)))
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(define-pred-stxclass identifier symbol?)
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(define-pred-stxclass boolean boolean?)
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(define-pred-stxclass str string?)
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(define-pred-stxclass character char?)
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(define-pred-stxclass keyword keyword?)
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(define-pred-stxclass number number?)
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(define-pred-stxclass integer integer?)
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(define-pred-stxclass exact-integer exact-integer?)
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(define-pred-stxclass exact-nonnegative-integer exact-nonnegative-integer?)
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(define-pred-stxclass exact-positive-integer exact-positive-integer?)
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;; Aliases
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(define-syntax id (make-rename-transformer #'identifier))
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(define-syntax nat (make-rename-transformer #'exact-nonnegative-integer))
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(define-syntax char (make-rename-transformer #'character))
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(define notfound (box 'notfound))
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(define-syntax-class (static-of pred name)
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#:attributes (value)
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(pattern x:id
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#:fail-unless (syntax-transforming?)
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"not within the extent of a macro transformer"
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#:attr value (syntax-local-value #'x (lambda () notfound))
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#:fail-when (eq? (attribute value) notfound) #f))
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(define-syntax-class static #:attributes (value)
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(pattern x
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#:declare x (static-of (lambda _ #t) "static")
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#:attr value (attribute x.value)))
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(define-syntax-class struct-name
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#:description "struct name"
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#:attributes (descriptor
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constructor
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predicate
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[accessor 1]
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super
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complete?)
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(pattern s
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#:declare s (static-of "struct name" struct-info?)
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#:with info (extract-struct-info (attribute s.value))
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#:with descriptor (list-ref (attribute info) 0)
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#:with constructor (list-ref (attribute info) 1)
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#:with predicate (list-ref (attribute info) 2)
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#:with r-accessors (reverse (list-ref (attribute info) 3))
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#:with (accessor ...)
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(datum->syntax #f (let ([r-accessors (attribute r-accessors)])
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(if (and (pair? r-accessors) (eq? #f (car r-accessors)))
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(cdr r-accessors)
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r-accessors)))
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#:with super (list-ref (attribute info) 5)
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#:attr complete? (or (null? (attribute r-accessors))
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(and (pair? (attribute r-accessors))
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(not (eq? #f (car (attribute r-accessors))))))))
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(define-syntax-class expr
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#:attributes ()
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(pattern x
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#:fail-when (keyword? (syntax-e #'x)) #f))
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(define-syntax kernel-literals
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(make-literalset
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(for/list ([id (kernel-form-identifier-list)])
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(list (syntax-e id) id))))
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