|
|
|
|
|
#lang racket/base
|
|
|
|
|
|
(require racket/match)
|
|
|
|
|
|
(require "../tools.rkt" "../predicates.rkt" sugar txexpr/fast)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
(provide (all-defined-out))
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
;; This module is a library of functions to be used in building pollen decoders.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
|
|
|
|
|
|
|
|
|
|
;; Typography
|
|
|
|
|
|
|
|
|
|
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
;; insert typographic niceties
|
|
|
|
|
|
;; ligatures are handled in css
|
|
|
|
|
|
(define (typogrify str)
|
|
|
|
|
|
;; make set of functions for replacers
|
|
|
|
|
|
(define (make-replacer query replacement)
|
|
|
|
|
|
(λ(str) (regexp-replace* query str replacement)))
|
|
|
|
|
|
|
|
|
|
|
|
;; just store the query strings + replacement strings
|
|
|
|
|
|
(define dashes
|
|
|
|
|
|
;; fix em dashes first, else they'll be mistaken for en dashes
|
|
|
|
|
|
;; [\\s ] is whitespace + nonbreaking space
|
|
|
|
|
|
'((#px"[\\s ]*(---|—)[\\s ]*" "—") ; em dash
|
|
|
|
|
|
(#px"[\\s ]*(--|–)[\\s ]*" "–"))) ; en dash
|
|
|
|
|
|
|
|
|
|
|
|
(define smart-quotes
|
|
|
|
|
|
'((#px"(?<=\\w)'(?=\\w)" "’") ; apostrophe
|
|
|
|
|
|
(#px"(?<!\\w)'(?=\\w)" "‘") ; single_at_beginning
|
|
|
|
|
|
(#px"(?<=\\S)'(?!\\w)" "’") ; single_at_end
|
|
|
|
|
|
(#px"(?<!\\w)\"(?=\\w)" "“") ; double_at_beginning
|
|
|
|
|
|
(#px"(?<=\\S)\"(?!\\w)" "”"))) ; double_at_end
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
;; put replacers in desired order here
|
|
|
|
|
|
(let* ([typogrifiers (append dashes smart-quotes)]
|
|
|
|
|
|
[queries (map first typogrifiers)]
|
|
|
|
|
|
[replacements (map second typogrifiers)])
|
|
|
|
|
|
(define replacers (map make-replacer queries replacements))
|
|
|
|
|
|
;; compose goes from last to first, so reverse order
|
|
|
|
|
|
((apply compose1 (reverse replacers)) str)))
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
;; insert nbsp between last two words
|
|
|
|
|
|
(define (nonbreaking-last-space x
|
|
|
|
|
|
#:nbsp [nbsp (->string #\u00A0)]
|
|
|
|
|
|
#:minimum-word-length [minimum-word-length 6])
|
|
|
|
|
|
|
|
|
|
|
|
;; todo: parameterize this, as it will be different for each project
|
|
|
|
|
|
(define tags-to-pay-attention-to '(p aside)) ; only apply to paragraphs
|
|
|
|
|
|
|
|
|
|
|
|
(define (replace-last-space str)
|
|
|
|
|
|
(if (#\space . in? . str)
|
|
|
|
|
|
(let ([reversed-str-list (reverse (string->list str))]
|
|
|
|
|
|
[reversed-nbsp (reverse (string->list nbsp))])
|
|
|
|
|
|
(define-values (last-word-chars other-chars)
|
|
|
|
|
|
(splitf-at reversed-str-list (λ(i) (not (eq? i #\space)))))
|
|
|
|
|
|
(list->string (reverse (append last-word-chars
|
|
|
|
|
|
; OK for long words to be on their own line.
|
|
|
|
|
|
(if (< (len last-word-chars) minimum-word-length)
|
|
|
|
|
|
; first char of other-chars will be the space, so use cdr
|
|
|
|
|
|
(append reversed-nbsp (cdr other-chars))
|
|
|
|
|
|
other-chars)))))
|
|
|
|
|
|
str))
|
|
|
|
|
|
|
|
|
|
|
|
(define (find-last-word-space x) ; recursively traverse xexpr
|
|
|
|
|
|
(cond
|
|
|
|
|
|
[(string? x) (replace-last-space x)]
|
|
|
|
|
|
[(txexpr? x)
|
|
|
|
|
|
(let-values([(tag attr elements) (txexpr->values x)])
|
|
|
|
|
|
(if (> (length elements) 0) ; elements is list of xexprs
|
|
|
|
|
|
(let-values ([(all-but-last last) (split-at elements (sub1 (length elements)))])
|
|
|
|
|
|
(make-txexpr tag attr `(,@all-but-last ,(find-last-word-space (car last)))))
|
|
|
|
|
|
x))]
|
|
|
|
|
|
[else x]))
|
|
|
|
|
|
|
|
|
|
|
|
(if ((car x) . in? . tags-to-pay-attention-to)
|
|
|
|
|
|
(find-last-word-space x)
|
|
|
|
|
|
x))
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
; wrap initial quotes for hanging punctuation
|
|
|
|
|
|
; todo: improve this
|
|
|
|
|
|
; does not handle <p>“<em>thing</em> properly
|
|
|
|
|
|
(define (wrap-hanging-quotes nx
|
|
|
|
|
|
#:single-prepend [single-pp '(squo)]
|
|
|
|
|
|
#:double-prepend [double-pp '(dquo)])
|
|
|
|
|
|
|
|
|
|
|
|
(define two-or-more-char-string? (λ(i) (and (string? i) (>= (len i) 2))))
|
|
|
|
|
|
(define-values (tag attr elements) (txexpr->values nx))
|
|
|
|
|
|
(make-txexpr tag attr
|
|
|
|
|
|
(if (and (list? elements) (not (empty? elements)))
|
|
|
|
|
|
(let ([new-car-elements (match (car elements)
|
|
|
|
|
|
[(? two-or-more-char-string? tcs)
|
|
|
|
|
|
(define str-first (get tcs 0))
|
|
|
|
|
|
(define str-rest (get tcs 1 'end))
|
|
|
|
|
|
(cond
|
|
|
|
|
|
[(str-first . in? . '("\"" "“"))
|
|
|
|
|
|
;; can wrap with any inline tag
|
|
|
|
|
|
;; so that linebreak detection etc still works
|
|
|
|
|
|
`(,@double-pp ,(->string #\“) ,str-rest)]
|
|
|
|
|
|
[(str-first . in? . '("\'" "‘"))
|
|
|
|
|
|
`(,@single-pp ,(->string #\‘) ,str-rest)]
|
|
|
|
|
|
[else tcs])]
|
|
|
|
|
|
[(? txexpr? nx) (wrap-hanging-quotes nx)]
|
|
|
|
|
|
[else (car elements)])])
|
|
|
|
|
|
(cons new-car-elements (cdr elements)))
|
|
|
|
|
|
elements)))
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
|
|
|
|
|
|
|
|
|
|
;; Lines, blocks, paragraphs
|
|
|
|
|
|
|
|
|
|
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
;; turn the right items into <br> tags
|
|
|
|
|
|
(define (convert-linebreaks xc #:newline [newline "\n"])
|
|
|
|
|
|
|
|
|
|
|
|
;; todo: should this test be not block + not whitespace?
|
|
|
|
|
|
(define not-block? (λ(i) (not (block-xexpr? i))))
|
|
|
|
|
|
(filter-not empty?
|
|
|
|
|
|
(for/list ([i (len xc)])
|
|
|
|
|
|
(let ([item (get xc i)])
|
|
|
|
|
|
(cond
|
|
|
|
|
|
;; skip first and last
|
|
|
|
|
|
[(or (= i 0) (= i (sub1 (len xc)))) item]
|
|
|
|
|
|
[(equal? item newline)
|
|
|
|
|
|
(match (get xc (- i 1) (+ i 2)) ; a three-element slice with x[i] in the middle
|
|
|
|
|
|
;; only convert if neither adjacent tag is a block
|
|
|
|
|
|
;; (because blocks automatically force a newline before & after)
|
|
|
|
|
|
[(list (? not-block?) newline (? not-block?)) '(br)]
|
|
|
|
|
|
[else empty])] ; otherwise delete
|
|
|
|
|
|
[else item])))))
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
;; recursive whitespace test
|
|
|
|
|
|
(define (whitespace? x)
|
|
|
|
|
|
|
|
|
|
|
|
(cond
|
|
|
|
|
|
[(or (string? x) (symbol? x)) (->boolean (regexp-match #px"^\\s+$" (->string x)))]
|
|
|
|
|
|
[(equal? "" x) #t] ; empty string is deemed whitespace
|
|
|
|
|
|
[(or (list? x) (vector? x)) (andmap whitespace? (->list x))]
|
|
|
|
|
|
[else #f]))
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
;; is x a paragraph break?
|
|
|
|
|
|
(define (paragraph-break? x #:pattern [paragraph-pattern #px"^\n\n+$"])
|
|
|
|
|
|
|
|
|
|
|
|
(and (string? x) (->boolean (regexp-match paragraph-pattern x))))
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
;; 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 (merge-newlines x)
|
|
|
|
|
|
|
|
|
|
|
|
(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 (apply string-append 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]))
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
;; todo: add native support for list-xexpr
|
|
|
|
|
|
;; decode triple newlines to list items
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
;; prepare elements for paragraph testing
|
|
|
|
|
|
(define (prep-paragraph-flow xc)
|
|
|
|
|
|
|
|
|
|
|
|
(convert-linebreaks (merge-newlines (trim xc whitespace?))))
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
;; apply paragraph tag
|
|
|
|
|
|
(define (wrap-paragraph xc #:tag [tag 'p])
|
|
|
|
|
|
|
|
|
|
|
|
(match xc
|
|
|
|
|
|
[(list (? block-xexpr? bx)) bx] ; leave a single block xexpr alone
|
|
|
|
|
|
[else (make-txexpr tag empty xc)])) ; otherwise wrap in p tag
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
;; detect paragraphs
|
|
|
|
|
|
;; todo: unit tests
|
|
|
|
|
|
(define (detect-paragraphs elements)
|
|
|
|
|
|
|
|
|
|
|
|
(let ([elements (prep-paragraph-flow elements)])
|
|
|
|
|
|
(if (ormap paragraph-break? elements) ; need this condition to prevent infinite recursion
|
|
|
|
|
|
(map wrap-paragraph (splitf-at* elements paragraph-break?)) ; split into ¶¶
|
|
|
|
|
|
elements)))
|
