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94 lines
3.6 KiB
Racket
94 lines
3.6 KiB
Racket
#lang debug racket
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(require quad/base "struct.rkt" "param.rkt")
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(provide (all-defined-out))
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(define (make-query-index q)
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(define qs (let loop ([q q])
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(cons q (append* (for/list ([elem (in-list (quad-elems q))]
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#:when (quad? elem))
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(loop elem))))))
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(list->vector qs))
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(define (string->key str #:this [this? #false])
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(match str
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["doc" 'doc]
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[(or "section" "sec" "s") 'section]
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[(or "page" "pg" "p") 'page]
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[(or "column" "col" "c") 'column]
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[(or "block" "b") 'block]
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[(or "line" "ln" "l") 'line]))
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(define preds (hasheq 'doc doc-quad?
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'section section-quad?
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'page page-quad?
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'column column-quad?
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'block block-quad?
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'line line-quad?))
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(define (parse-query str)
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(for/list ([piece (in-list (string-split str ":"))])
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(match (regexp-match #px"^(.*)\\[(.*?)\\]$" piece)
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[#false (cons (string->key piece) #false)]
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[(list _ name arg) (cons (hash-ref preds (string->key name)) (or (string->number arg)
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(string->symbol arg)))])))
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(define (vector-memf proc vec)
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(for/first ([idx (in-range (vector-length vec))]
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#:when (proc (vector-ref vec idx)))
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idx))
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(define (query quad-or-index query-str [starting-q #false])
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(define vec (match quad-or-index
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[(? quad? q) (make-query-index q)]
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[idx idx]))
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(for/fold ([vidx 0]
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#:result (and vidx (vector-ref vec vidx)))
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([query-piece (in-list (parse-query query-str))]
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#:break (not vidx))
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(match query-piece
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[(cons pred 'this)
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;; resolve `this` by finding the querying quad, and searching backward
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(for/first ([vidx (in-range (vector-memq starting-q vec) -1 -1)]
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#:when (pred (vector-ref vec vidx)))
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vidx)]
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[(cons pred count)
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(for/fold ([vidx vidx]
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;; sub 1 because return values add 1
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;; and final result should be location of matching quad
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#:result (and vidx (sub1 vidx)))
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([seen (in-range count)]
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#:break (not vidx))
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(for/first ([vidx (in-range vidx (vector-length vec))]
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#:when (pred (vector-ref vec vidx)))
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;; add 1 so on next iteration, we can find next matcher
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;; and won't re-find this one immediately
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(add1 vidx)))])))
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(module+ test
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(require rackunit)
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(define counter 0)
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(define-syntax-rule (factory type proc)
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(make-quad #:type type
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#:elems (for/list ([i (in-range 3)])
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(set! counter (add1 counter))
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(define new-q (proc))
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(quad-update! new-q
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[tag (format "~a[~a]-~a" 'proc counter (gensym))])
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(hash-set! (quad-attrs new-q) 'count counter)
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new-q)))
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(define (line) (make-quad #:type line-quad))
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(define (block) (factory block-quad line))
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(define (col) (factory column-quad block))
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(define (page) (factory page-quad col))
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(define (sec) (factory section-quad page))
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(define (count q) (and q (quad-ref q 'count)))
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(define doc (factory doc-quad sec))
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(check-eq? (query doc "page[this]" (query doc "line[2]")) (query doc "page[1]"))
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(check-equal? (count (query doc "sec[2]")) 242)
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(check-false (query doc "sec[102]:line[1]"))
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(check-equal? (count (query doc "sec[2]:pg[1]")) 162)
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(check-equal? (count (query doc "sec[2]:pg[1]:ln[3]")) 128)) |