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#lang racket/base
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(require racket/list racket/match xml)
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(require "block.rkt" "../world.rkt" sugar txexpr)
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(define (make-replacer query+replacement)
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(let ([queries (map car query+replacement)]
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[replacements (map second query+replacement)])
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;; reverse because first in list should be first applied to str (and compose1 works right-to-left)
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(apply compose1 (reverse (map (λ(query replacement) (λ(str) (regexp-replace* query str replacement))) queries replacements)))))
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(define+provide/contract (smart-dashes str)
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(string? . -> . string?)
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(define dashes
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;; fix em dashes first, else they'll be mistaken for en dashes
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;; \\s is whitespace + #\u00A0 is nonbreaking space
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'((#px"[\\s#\u00A0]*(---|—)[\\s#\u00A0]*" "—") ; em dash
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(#px"[\\s#\u00A0]*(--|–)[\\s#\u00A0]*" "–"))) ; en dash
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((make-replacer dashes) str))
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(define+provide/contract (smart-quotes str)
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(string? . -> . string?)
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(define quotes
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'((#px"(?<=\\w)'(?=\\w)" "’") ; apostrophe
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(#px"(?<!\\w)'(?=\\w)" "‘") ; single_at_beginning
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(#px"(?<=\\S)'(?!\\w)" "’") ; single_at_end
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(#px"(?<!\\w)\"(?=\\w)" "“") ; double_at_beginning
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(#px"(?<=\\S)\"(?!\\w)" "”"))) ; double_at_end
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((make-replacer quotes) str))
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;; insert nbsp between last two words
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(define+provide/contract (nonbreaking-last-space x #:nbsp [nbsp (->string #\u00A0)]
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#:minimum-word-length [minimum-word-length 6])
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((txexpr?) (#:nbsp string? #:minimum-word-length integer?) . ->* . txexpr?)
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;; todo: parameterize this, as it will be different for each project
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(define tags-to-pay-attention-to '(p aside)) ; only apply to paragraphs
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(define (replace-last-space str)
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(if (#\space . in? . str)
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(let ([reversed-str-list (reverse (string->list str))]
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[reversed-nbsp (reverse (string->list (->string nbsp)))])
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(define-values (last-word-chars other-chars)
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(splitf-at reversed-str-list (λ(i) (not (eq? i #\space)))))
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(define front-chars (if (< (len last-word-chars) minimum-word-length) ; OK for long words to be on their own line
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; first char of other-chars will be the space, so use cdr
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(string-append (list->string (reverse (cdr other-chars))) (->string nbsp))
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(list->string (reverse other-chars))))
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`(,front-chars (span [[pollen "no-hyphens"]] ,(list->string (reverse last-word-chars)))))
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(list str)))
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(define (find-last-word-space x) ; recursively traverse xexpr
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(cond
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[(string? x) (replace-last-space x)] ; todo: this assumes a paragraph only has one string in it.
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[(txexpr? x)
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(let-values([(tag attr elements) (txexpr->values x)])
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(if (> (length elements) 0) ; elements is list of xexprs
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(let-values ([(all-but-last last) (split-at elements (sub1 (length elements)))])
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(define result (find-last-word-space (car last)))
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(define result-items (if (txexpr? result) (list result) result)) ; might be txexpr, or list of new elements
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(make-txexpr tag attr `(,@all-but-last ,@result-items)))
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x))]
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[else x]))
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(if ((car x) . in? . tags-to-pay-attention-to)
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(find-last-word-space x)
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x))
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; wrap initial quotes for hanging punctuation
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; todo: improve this
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; does not handle <p>“<em>thing</em> properly
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(define+provide/contract (wrap-hanging-quotes nx
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#:single-prepend [single-pp '(squo)]
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#:double-prepend [double-pp '(dquo)])
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((txexpr?) (#:single-prepend list? #:double-prepend list?) . ->* . txexpr?)
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(define two-or-more-char-string? (λ(i) (and (string? i) (>= (len i) 2))))
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(define-values (tag attr elements) (txexpr->values nx))
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(make-txexpr tag attr
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(if (and (list? elements) (not (empty? elements)))
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(let ([new-car-elements (match (car elements)
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[(? two-or-more-char-string? tcs)
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(define str-first (get tcs 0))
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(define str-rest (get tcs 1 'end))
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(cond
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[(str-first . in? . '("\"" "“"))
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;; can wrap with any inline tag
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;; so that linebreak detection etc still works
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`(,@double-pp ,(->string #\“) ,str-rest)]
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[(str-first . in? . '("\'" "‘"))
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`(,@single-pp ,(->string #\‘) ,str-rest)]
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[else tcs])]
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[(? txexpr? nx) (wrap-hanging-quotes nx)]
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[else (car elements)])])
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(cons new-car-elements (cdr elements)))
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elements)))
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; Lines, blocks, paragraphs
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; turn the right items into <br> tags
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(define+provide/contract (detect-linebreaks xc
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#:separator [newline world:linebreak-separator]
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#:insert [linebreak '(br)])
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((txexpr-elements?) (#:separator string? #:insert xexpr?) . ->* . txexpr-elements?)
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;; todo: should this test be not block + not whitespace?
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(define not-block? (λ(i) (not (block-txexpr? i))))
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(filter-not empty?
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(for/list ([i (len xc)])
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(let ([item (get xc i)])
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(cond
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;; skip first and last
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[(or (= i 0) (= i (sub1 (len xc)))) item]
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[(equal? item newline)
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(match (get xc (- i 1) (+ i 2)) ; a three-element slice with x[i] in the middle
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;; only convert if neither adjacent tag is a block
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;; (because blocks automatically force a newline before & after)
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[(list (? not-block?) newline (? not-block?)) linebreak]
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[else empty])] ; otherwise delete
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[else item])))))
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;; recursive whitespace test
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(define+provide/contract (whitespace? x)
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(any/c . -> . coerce/boolean?)
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(cond
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[(equal? "" x) #t] ; empty string is deemed whitespace
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[(or (string? x) (symbol? x)) (regexp-match #px"^\\s+$" (->string x))]
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[(or (list? x) (vector? x)) (andmap whitespace? (->list x))]
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[else #f]))
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(define+provide/contract (whitespace/nbsp? x)
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(any/c . -> . coerce/boolean?)
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(or (whitespace? x) (equal? (->string x) (->string #\u00A0))))
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;; is x a paragraph break?
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(define+provide/contract (paragraph-break? x #:separator [sep world:paragraph-separator])
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((any/c) (#:separator pregexp?) . ->* . coerce/boolean?)
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(define paragraph-pattern (pregexp (format "^~a+$" sep)))
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(and (string? x) (regexp-match paragraph-pattern x)))
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(define (newline? x)
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(and (string? x) (equal? world:newline x)))
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(define (not-newline? x)
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(not (newline? x)))
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(define (do-merge xs [acc '()])
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(if (empty? xs)
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acc
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;; Try to peel the newlines off the front.
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(let-values ([(leading-newlines remainder) (splitf-at xs newline?)])
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(if (not (empty? leading-newlines)) ; if you got newlines ...
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;; combine them into a string and append them to the accumulator,
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;; and recurse on the rest
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(do-merge remainder (append acc (list (apply string-append leading-newlines))))
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;; otherwise peel off elements up to the next newline, append them to accumulator,
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;; and recurse on the rest
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(do-merge (dropf remainder not-newline?)
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(append acc (takef remainder not-newline?)))))))
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;; Find adjacent newline characters in a list and merge them into one item
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;; Scribble, by default, makes each newline a separate list item
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;; In practice, this is worthless.
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(define+provide/contract (merge-newlines x)
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(txexpr-elements? . -> . txexpr-elements?)
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(cond
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[(list? x) (do-merge (map merge-newlines x))]
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[else x]))
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;; detect paragraphs
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;; todo: unit tests
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(define+provide/contract (detect-paragraphs elements #:tag [tag 'p]
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#:separator [sep world:paragraph-separator]
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#:linebreak-proc [linebreak-proc detect-linebreaks])
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((txexpr-elements?) (#:tag symbol? #:separator string? #:linebreak-proc (txexpr-elements? . -> . txexpr-elements?))
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. ->* . txexpr-elements?)
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;; prepare elements for paragraph testing
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(define (prep-paragraph-flow xc)
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(linebreak-proc (merge-newlines (trim xc whitespace?))))
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(define my-paragraph-break? (λ(x) (and (paragraph-break? x #:separator sep) #t)))
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(define (wrap-paragraph xc)
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(match xc
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[(list (? block-txexpr? bx)) bx] ; leave a single block xexpr alone
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[else (make-txexpr tag empty xc)])) ; otherwise wrap in p tag
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(let ([elements (prep-paragraph-flow elements)])
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(if (ormap my-paragraph-break? elements) ; need this condition to prevent infinite recursion
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(map wrap-paragraph (splitf-at* elements my-paragraph-break?)) ; split into ¶¶
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elements))) |