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100 lines
6.2 KiB
Racket
100 lines
6.2 KiB
Racket
#lang pollen/mode racket/base
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(require (for-syntax racket/base syntax/parse))
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(require txexpr/base racket/string racket/match)
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(provide default-tag-function make-default-tag-function define-tag-function)
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(define first car)
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(define second cadr)
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(define default-tag-function
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(make-keyword-procedure
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(λ (outer-kws outer-kw-args . ids)
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(define (make-one-tag id)
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(make-keyword-procedure
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(λ (inner-kws inner-kw-args . attrs+xs)
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;; Three possible sources of attrs:
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;; 1) normal attrs, in a list at the front of the args
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;; 2) colon args, using special 'key: "value" syntax, also at the front of the args
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;; 3) keyword args.
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(define-values (leading-attrs xs) (if (and (pair? attrs+xs) (txexpr-attrs? (car attrs+xs)))
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(values (car attrs+xs) (cdr attrs+xs))
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(values null attrs+xs)))
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(define-values (kws kw-args) (values (append outer-kws inner-kws) (append outer-kw-args inner-kw-args)))
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(match-define (list colon-attrs ... body) (let parse-one-colon-attr ([xs xs])
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(define (colon-attr-name? x) (let ([result (regexp-match #rx".*?(?=:$)" (symbol->string x))])
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(and result (string->symbol (car result))))) ; return name or #f
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(define maybe-attr-name (and (>= (length xs) 2)
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(symbol? (first xs))
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(string? (second xs)) ; accept strings only as attr value
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(colon-attr-name? (first xs))))
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(if maybe-attr-name
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(let ([attr-name maybe-attr-name][attr-value (second xs)])
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(cons (list attr-name attr-value) (parse-one-colon-attr (cddr xs))))
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(list xs))))
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(define kw-symbols (map (λ(kw) (string->symbol (string-trim (keyword->string kw) "#:"))) kws))
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(define attrs (append (map list kw-symbols kw-args) colon-attrs leading-attrs))
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;; construct the xexpr result "manually" (i.e., not with `make-txexpr` because it may not be a legit txexpr for now
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;; (but it may become one through further processing, so no need to be finicky)
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;; however, don't show empty attrs.
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(list* id (if (null? attrs)
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body
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(list* attrs body))))))
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(let ([tag-proc (apply compose1 (map make-one-tag ids))]
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[tag-proc-name (string->symbol (format "pollen-tag:~a" (string-join (map symbol->string ids) "+")))])
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(procedure-rename tag-proc tag-proc-name)))))
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(define make-default-tag-function default-tag-function) ; bw compat
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(module+ test
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(require rackunit txexpr/check)
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(define outerdiv (default-tag-function 'div #:class "outer" #:style "outer"))
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(check-txexprs-equal? (outerdiv "foo") '(div ((class "outer") (style "outer")) "foo"))
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(check-txexprs-equal? (outerdiv) '(div ((class "outer") (style "outer"))))
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(check-txexprs-equal? (outerdiv #:class "inner") '(div ((class "outer") (style "outer") (class "inner"))))
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(check-txexprs-equal? (outerdiv #:class "inner" "foo") '(div ((class "outer") (style "outer") (class "inner")) "foo"))
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(check-txexprs-equal? (outerdiv #:field "greens" #:id "shazbot" "foo") '(div ((class "outer") (style "outer") (field "greens") (id "shazbot")) "foo"))
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(check-txexprs-equal? (outerdiv 'id: "shazbot" "foo") '(div ((class "outer") (style "outer") (id "shazbot")) "foo"))
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(check-txexprs-equal? (outerdiv '((id "shazbot")) "foo") '(div ((class "outer") (style "outer") (id "shazbot")) "foo"))
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(check-txexprs-equal? (outerdiv 'id: "shazbot" 'class: "inner" "foo") '(div ((class "outer") (style "outer") (id "shazbot") (class "inner")) "foo"))
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;; (outerdiv 'id: "shazbot" '((class "inner")) "foo") won't work because colon attrs supplant conventional attrs (docs concur)
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(check-txexprs-equal? (outerdiv 'id: "shazbot" #:class "inner" "foo") '(div ((class "outer") (style "outer") (class "inner") (id "shazbot")) "foo")))
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(define-syntax (define-tag-function stx)
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(syntax-parse stx
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#:literals (λ)
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[(_ (ID:id ARG:id ...) EXPR:expr ...)
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#'(define-tag-function ID (λ (ARG ...) EXPR ...))]
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[(_ ID:id (λ (ATTRS:id ELEMS:id ARG:id ...) EXPR:expr ...))
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#:fail-when (> (length (syntax->list #'(ARG ...))) 0) "tag function must have exactly 2 positional arguments"
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#:fail-when (check-duplicate-identifier (list #'ATTRS #'ELEMS)) "duplicate variable name"
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#:fail-when (null? (syntax->list #'(EXPR ...))) "body of definition cannot be empty"
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#'(define ID
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(make-keyword-procedure
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(λ (kws kwargs . args)
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(define tx-proc (keyword-apply default-tag-function kws kwargs (list 'ID)))
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(define tx (apply tx-proc args))
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(define-values (_ ATTRS ELEMS) (txexpr->values tx))
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EXPR ...)))]))
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(module+ test
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(require rackunit)
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(define foo2 (default-tag-function 'foo))
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(define-tag-function (foo attrs elems)
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`(foo ,(reverse attrs) ,@elems))
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(check-txexprs-equal? ◊foo[#:zim "zam"]{hello} ◊foo2[#:zim "zam"]{hello})
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(check-txexprs-equal? ◊foo[#:ding "dong" '((zim "zam"))]{hello} ◊foo2[#:ding "dong" '((zim "zam"))]{hello})
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(check-txexprs-equal? ◊foo['zim: "zam" #:ding "dong" ]{hello} ◊foo2['zim: "zam" #:ding "dong" ]{hello})
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(define-tag-function foolam (λ (attrs elems)
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`(foo ,(reverse attrs) ,@elems)))
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(check-txexprs-equal? ◊foolam[#:zim "zam"]{hello} ◊foo2[#:zim "zam"]{hello})
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(check-txexprs-equal? ◊foolam[#:ding "dong" '((zim "zam"))]{hello} ◊foo2[#:ding "dong" '((zim "zam"))]{hello})
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(check-txexprs-equal? ◊foolam['zim: "zam" #:ding "dong" ]{hello} ◊foo2['zim: "zam" #:ding "dong" ]{hello})) |