|
|
#lang racket/base
|
|
|
(require racket/contract racket/list racket/string racket/match)
|
|
|
(require (only-in racket/format ~a))
|
|
|
(require (only-in racket/bool nor))
|
|
|
(require (only-in xml xexpr/c))
|
|
|
(module+ test (require rackunit))
|
|
|
|
|
|
(require "tools.rkt")
|
|
|
(require (prefix-in html: "library/html.rkt"))
|
|
|
(provide (all-defined-out))
|
|
|
|
|
|
|
|
|
;; split list into list of sublists using test-proc
|
|
|
(define/contract (splitf-at* xs test-proc)
|
|
|
(list? procedure? . -> . (λ(i) (match i [(list (? list?) ...) #t][else #f])))
|
|
|
(define (&splitf-at* pieces [acc '()]) ; use acc for tail recursion
|
|
|
(if (empty? pieces)
|
|
|
acc
|
|
|
(let-values ([(item rest)
|
|
|
(splitf-at (dropf pieces test-proc) (compose1 not test-proc))])
|
|
|
(&splitf-at* rest `(,@acc ,item)))))
|
|
|
(&splitf-at* (trim xs test-proc)))
|
|
|
|
|
|
(module+ test
|
|
|
(check-equal? (splitf-at* '(1 2 3 4 5 6) even?) '((1)(3)(5)))
|
|
|
(check-equal? (splitf-at* '("foo" " " "bar" "\n" "\n" "ino") whitespace?) '(("foo")("bar")("ino"))))
|
|
|
|
|
|
|
|
|
|
|
|
;; Find adjacent newline characters in a list and merge them into one item
|
|
|
;; Scribble, by default, makes each newline a separate list item
|
|
|
;; In practice, this is worthless.
|
|
|
(define/contract (merge-newlines x)
|
|
|
(list? . -> . list?)
|
|
|
(define (newline? x)
|
|
|
(and (string? x) (equal? "\n" x)))
|
|
|
(define (not-newline? x)
|
|
|
(not (newline? x)))
|
|
|
|
|
|
(define (really-merge-newlines xs [acc '()])
|
|
|
(if (empty? xs)
|
|
|
acc
|
|
|
;; Try to peel the newlines off the front.
|
|
|
(let-values ([(leading-newlines remainder) (splitf-at xs newline?)])
|
|
|
(if (not (empty? leading-newlines)) ; if you got newlines ...
|
|
|
;; combine them into a string and append them to the accumulator,
|
|
|
;; and recurse on the rest
|
|
|
(really-merge-newlines remainder (append acc (list (string-join leading-newlines ""))))
|
|
|
;; otherwise peel off elements up to the next newline, append them to accumulator,
|
|
|
;; and recurse on the rest
|
|
|
(really-merge-newlines (dropf remainder not-newline?)
|
|
|
(append acc (takef remainder not-newline?)))))))
|
|
|
|
|
|
(cond
|
|
|
[(list? x) (really-merge-newlines (map merge-newlines x))]
|
|
|
[else x]))
|
|
|
|
|
|
(module+ test
|
|
|
(check-equal? (merge-newlines '(p "\n" "foo" "\n" "\n" "bar" (em "\n" "\n" "\n")))
|
|
|
'(p "\n" "foo" "\n\n" "bar" (em "\n\n\n"))))
|
|
|
|
|
|
|
|
|
(define block-tags html:block-tags)
|
|
|
(define (register-block-tag tag)
|
|
|
(set! block-tags (cons tag block-tags)))
|
|
|
|
|
|
;; todo: add native support for list-xexpr
|
|
|
;; decode triple newlines to list items
|
|
|
|
|
|
;; is the tagged-xexpr a block element (as opposed to inline)
|
|
|
;; tags are inline unless they're registered as block tags.
|
|
|
(define/contract (block-xexpr? x)
|
|
|
(any/c . -> . boolean?)
|
|
|
((tagged-xexpr? x) . and . (->boolean ((tagged-xexpr-tag x) . in . block-tags))))
|
|
|
|
|
|
(module+ test
|
|
|
(check-true (block-xexpr? '(p "foo")))
|
|
|
(check-true (block-xexpr? '(div "foo")))
|
|
|
(check-false (block-xexpr? '(em "foo")))
|
|
|
(check-false (block-xexpr? '(barfoo "foo")))
|
|
|
(check-true (begin (register-block-tag 'barfoo) (block-xexpr? '(barfoo "foo")))))
|
|
|
|
|
|
|
|
|
;; convert numbers to strings
|
|
|
;; maybe this isn't necessary
|
|
|
(define (stringify x)
|
|
|
(map-tree (λ(i) (if (number? i) (->string i) i)) x))
|
|
|
|
|
|
(module+ test
|
|
|
(check-equal? (stringify '(p 1 2 "foo" (em 4 "bar"))) '(p "1" "2" "foo" (em "4" "bar"))))
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
(module+ test
|
|
|
(check-false (scribble:whitespace? (list "\n" " " "\n"))) ; scribble result is too surprising
|
|
|
(check-true (whitespace? " "))
|
|
|
(check-false (whitespace? "foo"))
|
|
|
(check-false (whitespace? " ")) ; a nonbreaking space
|
|
|
(check-true (whitespace? "\n \n"))
|
|
|
(check-true (whitespace? (list "\n" " " "\n")))
|
|
|
(check-true (whitespace? (list "\n" " " "\n" (list "\n" "\n")))))
|
|
|
|
|
|
|
|
|
|
|
|
;; trim from beginning & end of list
|
|
|
(define (trim items test-proc)
|
|
|
(list? procedure? . -> . list?)
|
|
|
(dropf-right (dropf items test-proc) test-proc))
|
|
|
|
|
|
(module+ test
|
|
|
(check-equal? (trim (list "\n" " " 1 2 3 "\n") whitespace?) '(1 2 3))
|
|
|
(check-equal? (trim (list 1 3 2 4 5 6 8 9 13) odd?) '(2 4 5 6 8)))
|
|
|
|
|
|
|
|
|
|
|
|
;; test for well-formed meta
|
|
|
(define/contract (meta-xexpr? x)
|
|
|
(any/c . -> . boolean?)
|
|
|
(match x
|
|
|
[`(meta ,(? string? key) ,(? string? value)) #t]
|
|
|
[else #f]))
|
|
|
|
|
|
(module+ test
|
|
|
(check-true (meta-xexpr? '(meta "key" "value")))
|
|
|
(check-false (meta-xexpr? '(meta "key" "value" "foo")))
|
|
|
(check-false (meta-xexpr? '(meta))))
|
|
|
|
|
|
|
|
|
;; function to strip metas (or any tag)
|
|
|
(define/contract (extract-tag-from-xexpr tag nx)
|
|
|
(xexpr-tag? tagged-xexpr? . -> . (values tagged-xexpr? xexpr-elements?))
|
|
|
(define matches '())
|
|
|
(define (extract-tag x)
|
|
|
(cond
|
|
|
[(and (tagged-xexpr? x) (equal? tag (car x)))
|
|
|
; stash matched tag but return empty value
|
|
|
(begin
|
|
|
(set! matches (cons x matches))
|
|
|
empty)]
|
|
|
[(tagged-xexpr? x) (let-values([(tag attr body) (break-tagged-xexpr x)])
|
|
|
(make-tagged-xexpr tag attr (extract-tag body)))]
|
|
|
[(xexpr-elements? x) (filter-not empty? (map extract-tag x))]
|
|
|
[else x]))
|
|
|
(values (extract-tag nx) (reverse matches)))
|
|
|
|
|
|
|
|
|
(module+ test
|
|
|
(define x '(root (meta "foo" "bar") "hello" "world" (meta "foo2" "bar2")
|
|
|
(em "goodnight" "moon" (meta "foo3" "bar3"))))
|
|
|
|
|
|
(check-equal? (values->list (extract-tag-from-xexpr 'meta x))
|
|
|
(list '(root "hello" "world" (em "goodnight" "moon"))
|
|
|
'((meta "foo" "bar") (meta "foo2" "bar2") (meta "foo3" "bar3")))))
|
|
|
;; decoder wireframe
|
|
|
(define/contract (decode nx
|
|
|
#:exclude-xexpr-tags [excluded-xexpr-tags '()]
|
|
|
#:xexpr-tag-proc [xexpr-tag-proc (λ(x)x)]
|
|
|
#:xexpr-attr-proc [xexpr-attr-proc (λ(x)x)]
|
|
|
#:xexpr-elements-proc [xexpr-elements-proc (λ(x)x)]
|
|
|
#:block-xexpr-proc [block-xexpr-proc (λ(x)x)]
|
|
|
#:inline-xexpr-proc [inline-xexpr-proc (λ(x)x)]
|
|
|
#:string-proc [string-proc (λ(x)x)]
|
|
|
#:meta-proc [meta-proc (λ(x)x)])
|
|
|
;; use xexpr/c for contract because it gives better error messages
|
|
|
((xexpr/c) (#:exclude-xexpr-tags (λ(i) (or (symbol? i) (list? i)))
|
|
|
#:xexpr-tag-proc procedure?
|
|
|
#:xexpr-attr-proc procedure?
|
|
|
#:xexpr-elements-proc procedure?
|
|
|
#:block-xexpr-proc procedure?
|
|
|
#:inline-xexpr-proc procedure?
|
|
|
#:string-proc procedure?
|
|
|
#:meta-proc procedure?)
|
|
|
. ->* . tagged-xexpr?)
|
|
|
(when (not (tagged-xexpr? nx))
|
|
|
(error (format "decode: ~v not a full tagged-xexpr" nx)))
|
|
|
|
|
|
(define metas (list))
|
|
|
|
|
|
(define (&decode x)
|
|
|
(cond
|
|
|
[(tagged-xexpr? x) (let-values([(tag attr elements) (break-tagged-xexpr x)])
|
|
|
(if (tag . in . (->list excluded-xexpr-tags))
|
|
|
x
|
|
|
(let ([decoded-xexpr
|
|
|
(apply make-tagged-xexpr (map &decode (list tag attr elements)))])
|
|
|
((if (block-xexpr? decoded-xexpr)
|
|
|
block-xexpr-proc
|
|
|
inline-xexpr-proc) decoded-xexpr))))]
|
|
|
[(xexpr-tag? x) (xexpr-tag-proc x)]
|
|
|
[(xexpr-attr? x) (xexpr-attr-proc x)]
|
|
|
[(xexpr-elements? x) (map &decode (xexpr-elements-proc x))]
|
|
|
[(string? x) (string-proc x)]
|
|
|
[else x]))
|
|
|
|
|
|
|
|
|
(let-values ([(nx metas) (extract-tag-from-xexpr 'meta nx)])
|
|
|
(append (&decode nx) (map meta-proc metas))))
|
|
|
|