You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
116 lines
4.7 KiB
Racket
116 lines
4.7 KiB
Racket
#lang debug racket
|
|
(require quad/base "struct.rkt" "param.rkt")
|
|
(provide (all-defined-out))
|
|
|
|
(define (make-query-index q)
|
|
(define qs (let loop ([q q])
|
|
(cons q (append* (for/list ([elem (in-list (quad-elems q))]
|
|
#:when (quad? elem))
|
|
(loop elem))))))
|
|
(list->vector qs))
|
|
|
|
(define (string->key str)
|
|
(match str
|
|
["doc" 'doc]
|
|
[(or "section" "sec" "s") 'section]
|
|
[(or "page" "pg" "p") 'page]
|
|
[(or "column" "col" "c") 'column]
|
|
[(or "block" "b") 'block]
|
|
[(or "line" "ln" "l") 'line]))
|
|
|
|
(define preds (hasheq 'doc doc-quad?
|
|
'section section-quad?
|
|
'page page-quad?
|
|
'column column-quad?
|
|
'block block-quad?
|
|
'line line-quad?))
|
|
|
|
(define (parse-query str)
|
|
(for/list ([piece (in-list (string-split str ":"))])
|
|
(match (regexp-match #px"^(.*)\\[(.*?)\\]$" piece)
|
|
[#false (cons (string->key piece) #false)]
|
|
[(list _ name arg) (cons (hash-ref preds (string->key name))
|
|
(or (string->number arg) (string->symbol arg)))])))
|
|
|
|
(define (find-inclusive vec pred start-arg end-arg [count 1])
|
|
;; search from lidx to ridx inclusive
|
|
(define-values (start end step)
|
|
(cond
|
|
;; if lidx is bigger, search backward
|
|
[(> start-arg end-arg) (values start-arg (sub1 end-arg) -1)]
|
|
[else (values start-arg (add1 end-arg) 1)]))
|
|
(for/fold ([start-adjusted (- start step)]) ; remove step for reason below
|
|
([seen (in-range count)]
|
|
#:break (not start-adjusted))
|
|
;; add step so we find next matcher
|
|
;; and won't re-find the last one immediately
|
|
(for/first ([idx (in-range (+ start-adjusted step) end step)]
|
|
#:when (pred (vector-ref vec idx)))
|
|
idx)))
|
|
|
|
(define (query quad-or-index query-str [starting-q #false])
|
|
(define vec (match quad-or-index
|
|
[(? quad? q) (make-query-index q)]
|
|
[idx idx]))
|
|
(for/fold ([vidx 0]
|
|
[maxidx (sub1 (vector-length vec))]
|
|
#:result (and vidx (vector-ref vec vidx)))
|
|
([query-piece (in-list (parse-query query-str))]
|
|
#:break (not vidx))
|
|
(match-define (cons pred count) query-piece)
|
|
(define res-idx
|
|
(match count
|
|
[(== 'this eq?) ; start at querying quad, then search backward
|
|
(find-inclusive vec pred (vector-memq starting-q vec) 0)]
|
|
[(== 'last eq?) ; search backward from end
|
|
(find-inclusive vec pred maxidx 0)]
|
|
[(== 'prev eq?) (find-inclusive vec pred (vector-memq starting-q vec) 0 2)]
|
|
[(== 'next eq?) (find-inclusive vec pred ((if (pred starting-q) add1 values) (vector-memq starting-q vec)) maxidx)]
|
|
[count (find-inclusive vec pred vidx maxidx count)]))
|
|
(define next-maxidx
|
|
(cond
|
|
[(not res-idx) maxidx]
|
|
;; try searching for next occurence after this one, up to max.
|
|
[(find-inclusive vec pred (add1 res-idx) maxidx)]
|
|
[else maxidx]))
|
|
(values res-idx next-maxidx)))
|
|
|
|
(module+ test
|
|
(require rackunit)
|
|
|
|
(define counter 0)
|
|
(define-syntax-rule (factory type proc)
|
|
(make-quad #:type type
|
|
#:elems (for/list ([i (in-range 3)])
|
|
(set! counter (add1 counter))
|
|
(define new-q (proc))
|
|
(quad-update! new-q
|
|
[tag (format "~a[~a]-~a" 'proc counter (gensym))])
|
|
(hash-set! (quad-attrs new-q) 'count counter)
|
|
new-q)))
|
|
|
|
(define (line) (make-quad #:type line-quad))
|
|
(define (block) (factory block-quad line))
|
|
(define (col) (factory column-quad block))
|
|
(define (page) (factory page-quad col))
|
|
(define (sec) (factory section-quad page))
|
|
|
|
(define (count q) (and q (quad-ref q 'count)))
|
|
(define doc (factory doc-quad sec))
|
|
|
|
(check-equal? (count (query doc "sec[2]")) 242)
|
|
(check-false (query doc "sec[102]:line[1]"))
|
|
(check-equal? (count (query doc "sec[2]:pg[1]")) 162)
|
|
(check-equal? (count (query doc "sec[2]:pg[1]:ln[3]")) 128)
|
|
(check-eq? (query doc "page[this]" (query doc "line[2]")) (query doc "page[1]"))
|
|
(check-equal? (count (query doc "page[this]:line[last]" (query doc "line[2]"))) 41)
|
|
|
|
(check-equal? (count (query doc "sec[next]" (query doc "sec[1]"))) (count (query doc "sec[2]")) )
|
|
(check-equal? (count (query doc "sec[prev]" (query doc "sec[2]"))) (count (query doc "sec[1]")))
|
|
|
|
(check-equal? (count (query doc "page[prev]" (query doc "page[2]:line[1]")))
|
|
(count (query doc "page[1]")))
|
|
(check-equal? (count (query doc "page[next]" (query doc "page[2]:line[1]")))
|
|
(count (query doc "page[3]")))
|
|
|
|
) |