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pollen/ptree.rkt

324 lines
13 KiB
Racket

#lang racket/base
(require racket/contract racket/match xml/path)
(require "tools.rkt" "world.rkt" "debug.rkt" "decode.rkt")
(module+ test (require rackunit))
(provide (all-defined-out))
;; Load ptree file & return ptree
(define/contract (ptree-source->ptree path)
(pathish? . -> . ptree?)
;; dynamic require of a ptree source file gets you a full ptree.
(message "Loading ptree file" (->string (file-name-from-path path)))
(dynamic-require path POLLEN_ROOT))
;; Synthesize ptree from directory listing.
;; Fallback in case ptree file isn't available.
(define/contract (directory->ptree dir)
(directory-pathish? . -> . ptree?)
(let ([files (map remove-ext (filter (λ(x) (has-ext? x POLLEN_SOURCE_EXT)) (directory-list dir)))])
(message "Generating ptree from file listing")
(ptree-root->ptree (cons POLLEN_TREE_ROOT_NAME (map path->pnode files)))))
;; Try loading from ptree file, or failing that, synthesize ptree.
(define/contract (make-project-ptree [project-dir pollen-project-directory])
(() (directory-pathish?) . ->* . ptree?)
(define ptree-source (build-path project-dir DEFAULT_POLLEN_TREE))
(if (file-exists? ptree-source)
(ptree-source->ptree ptree-source)
(directory->ptree project-dir)))
;; remove parents from tree (i.e., just remove attrs)
;; is not the inverse of add-parents, i.e., you do not get back your original input.
(define/contract (remove-parents mt)
(ptree? . -> . tagged-xexpr?)
(remove-attrs mt))
(module+ test
(check-equal? (remove-parents
`(ptree-main ((,POLLEN_TREE_PARENT_NAME "")) (foo ((,POLLEN_TREE_PARENT_NAME ""))) (bar ((,POLLEN_TREE_PARENT_NAME ""))) (one ((,POLLEN_TREE_PARENT_NAME "")) (two ((,POLLEN_TREE_PARENT_NAME "one")) (three ((,POLLEN_TREE_PARENT_NAME "two")))))))
'(ptree-main (foo) (bar) (one (two (three))))))
(module+ test
(let ([sample-main `(POLLEN_TREE_ROOT_NAME "foo" "bar" (one (two "three")))])
(check-equal? (ptree-root->ptree sample-main)
`(POLLEN_TREE_ROOT_NAME ((,POLLEN_TREE_PARENT_NAME "")) (foo ((,POLLEN_TREE_PARENT_NAME "POLLEN_TREE_ROOT_NAME"))) (bar ((,POLLEN_TREE_PARENT_NAME "POLLEN_TREE_ROOT_NAME"))) (one ((,POLLEN_TREE_PARENT_NAME "POLLEN_TREE_ROOT_NAME")) (two ((,POLLEN_TREE_PARENT_NAME "one")) (three ((,POLLEN_TREE_PARENT_NAME "two")))))))))
;; return the parent of a given name
(define/contract (parent pnode [ptree current-ptree])
((pnode?) (ptree?) . ->* . (or/c string? boolean?))
(and pnode (let ([result (se-path* `(,(->symbol pnode) #:parent) ptree)])
(and result (->string result))))) ; se-path* returns #f if nothing found
(module+ test
(define test-ptree-main `(ptree-main "foo" "bar" (one (two "three"))))
(define test-ptree (ptree-root->ptree test-ptree-main))
(check-equal? (parent 'three test-ptree) "two")
(check-equal? (parent "three" test-ptree) "two")
(check-false (parent 'nonexistent-name test-ptree)))
; get children of a particular pnode
(define/contract (children pnode [ptree current-ptree])
((pnode?) (ptree?) . ->* . (or/c list? boolean?))
;; se-path*/list returns '() if nothing found
(and pnode (let ([children (se-path*/list `(,(->symbol pnode)) ptree)])
; If there are sublists, just take first pnode
(and (not (empty? children)) (map (λ(i) (->string (if (list? i) (car i) i))) children)))))
(module+ test
(check-equal? (children 'one test-ptree) (list "two"))
(check-equal? (children 'two test-ptree) (list "three"))
(check-false (children 'three test-ptree))
(check-false (children 'fooburger test-ptree)))
;; find all siblings on current level: go up to parent and ask for children
(define/contract (siblings pnode [ptree current-ptree])
;; this never returns false: pnode is always a sibling of itself.
;; todo: how to use input value in contract? e.g., to check that pnode is part of output list
((pnode?) (ptree?) . ->* . (or/c list? boolean?))
(children (parent pnode ptree) ptree))
(module+ test
(check-equal? (siblings 'one test-ptree) '("foo" "bar" "one"))
(check-equal? (siblings 'foo test-ptree) '("foo" "bar" "one"))
(check-equal? (siblings 'two test-ptree) '("two"))
(check-false (siblings 'invalid-key test-ptree)))
(define/contract (siblings-split pnode [ptree current-ptree])
((pnode?) (ptree?) . ->* . (values (or/c (listof pnode?) boolean?)
(or/c (listof pnode?) boolean?)))
(let-values ([(left right) (splitf-at (siblings pnode ptree)
(λ(e) (not (equal? (->string e) (->string pnode)))))])
(values (if (empty? left) #f left) (if (empty? (cdr right)) #f (cdr right)))))
(module+ test
(check-equal? (values->list (siblings-split 'one test-ptree)) '(("foo" "bar") #f))
(check-equal? (values->list (siblings-split 'bar test-ptree)) (list '("foo") '("one"))))
;; siblings to the left of target pnode (i.e., precede in tree order)
(define (siblings-left pnode [ptree current-ptree])
(let-values ([(left right) (siblings-split pnode ptree)])
left))
(module+ test
(check-equal? (siblings-left 'one test-ptree) '("foo" "bar"))
(check-false (siblings-left 'foo test-ptree)))
;; siblings to the right of target pnode (i.e., follow in tree order)
(define (siblings-right pnode [ptree current-ptree])
(let-values ([(left right) (siblings-split pnode ptree)])
right))
(module+ test
(check-false (siblings-right 'one test-ptree))
(check-equal? (siblings-right 'foo test-ptree) '("bar" "one")))
;; get pnode immediately to the left in tree
(define/contract (sibling-previous pnode [ptree current-ptree])
((pnode?) (ptree?) . ->* . (or/c string? boolean?))
(let ([siblings (siblings-left pnode ptree)])
(and siblings (last siblings))))
(module+ test
(check-equal? (sibling-previous 'bar test-ptree) "foo")
(check-false (sibling-previous 'foo test-ptree)))
;; get pnode immediately to the right in tree
(define/contract (sibling-next pnode [ptree current-ptree])
((pnode?) (ptree?) . ->* . (or/c string? boolean?))
(let ([siblings (siblings-right pnode ptree)])
(and siblings (first siblings))))
(module+ test
(check-equal? (sibling-next 'foo test-ptree) "bar")
(check-false (sibling-next 'one test-ptree)))
;; flatten tree to sequence
(define/contract (all-pnodes [ptree current-ptree])
(ptree? . -> . (listof string?))
; use cdr to get rid of root tag at front
(map ->string (cdr (flatten (remove-parents ptree)))))
(module+ test
(check-equal? (all-pnodes test-ptree) '("foo" "bar" "one" "two" "three")))
;; helper function for get-previous-pnodes and get-next-pnodes
(define/contract (adjacent-pnodes side pnode [ptree current-ptree])
((symbol? pnode?) (ptree?) . ->* . (or/c list? boolean?))
(let ([result ((if (equal? side 'left)
takef
takef-right) (all-pnodes ptree)
(λ(y) (not (equal? (->string pnode) (->string y)))))])
(and (not (empty? result)) result)))
(module+ test
(check-equal? (adjacent-pnodes 'left 'one test-ptree) '("foo" "bar"))
(check-equal? (adjacent-pnodes 'left 'three test-ptree) '("foo" "bar" "one" "two"))
(check-false (adjacent-pnodes 'left 'foo test-ptree)))
;; get sequence of earlier pnodes
(define/contract (previous-pnodes pnode [ptree current-ptree])
((pnode?) (ptree?) . ->* . (or/c list? boolean?))
(adjacent-pnodes 'left pnode ptree))
(module+ test
(check-equal? (previous-pnodes 'one test-ptree) '("foo" "bar"))
(check-equal? (previous-pnodes 'three test-ptree) '("foo" "bar" "one" "two"))
(check-false (previous-pnodes 'foo test-ptree)))
;; get sequence of next pnodes
(define (next-pnodes pnode [ptree current-ptree])
((pnode?) (ptree?) . ->* . (or/c list? boolean?))
(adjacent-pnodes 'right pnode ptree))
(module+ test
(check-equal? (next-pnodes 'foo test-ptree) '("bar" "one" "two" "three"))
(check-equal? (next-pnodes 'one test-ptree) '("two" "three"))
(check-false (next-pnodes 'three test-ptree)))
;; get pnode immediately previous
(define/contract (previous-pnode pnode [ptree current-ptree])
((pnode?) (ptree?) . ->* . (or/c string? boolean?))
(let ([result (previous-pnodes pnode ptree)])
(and result (last result))))
(module+ test
(check-equal? (previous-pnode 'one test-ptree) "bar")
(check-equal? (previous-pnode 'three test-ptree) "two")
(check-false (previous-pnode 'foo test-ptree)))
;; get pnode immediately next
(define (next-pnode pnode [ptree current-ptree])
((pnode?) (ptree?) . ->* . (or/c string? boolean?))
(let ([result (next-pnodes pnode ptree)])
(and result (first result))))
(module+ test
(check-equal? (next-pnode 'foo test-ptree) "bar")
(check-equal? (next-pnode 'one test-ptree) "two")
(check-false (next-pnode 'three test-ptree)))
;; convert path to pnode
;; used for converting "here" values to pnodes
(define/contract (path->pnode x)
(pathish? . -> . pnode?)
(->string (remove-all-ext (last (explode-path (->path x))))))
(module+ test
(check-equal? (path->pnode "bar") "bar")
(check-equal? (path->pnode "foo/bar") "bar")
(check-equal? (path->pnode "foo/bar.html") "bar")
(check-equal? (path->pnode "/Users/this/that/foo/bar.html.pp") "bar"))
(define here->pnode path->pnode)
(define/contract (pnode->url pnode [files current-url-context])
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((pnode?) ((listof pathish?)) . ->* . (or/c string? boolean?))
;; upconvert all files to their output path
;; then remove duplicates because some sources might have already been rendered
(define output-paths (remove-duplicates (map ->output-path files) equal?))
;; find ones that match pnode
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(define matching-paths (filter (λ(x) (equal? (->string (remove-all-ext x)) (->string pnode))) output-paths))
(cond
[((len matching-paths) . = . 1) (->string (car matching-paths))]
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[((len matching-paths) . > . 1) (error "More than one matching URL for" pnode)]
[else #f] ))
(module+ test
(define files '("foo.html" "bar.html" "bar.html.p" "zap.html" "zap.xml"))
(check-equal? (pnode->url 'foo files) "foo.html")
(check-equal? (pnode->url 'bar files) "bar.html")
;; (check-equal? (pnode->url 'zap files) 'error) ;; todo: how to test error?
(check-equal? (pnode->url 'hee files) "#"))
;; recursively processes tree, converting tree locations & their parents into xexprs of this shape:
;; '(location ((parent "parent")))
(define/contract (add-parents x [parent empty])
((tagged-xexpr?) (xexpr-tag?) . ->* . ptree?)
(match x
;; this pattern signifies next level in hierarchy
;; where first element is new parent, and rest are children.
[(list (? xexpr-tag? next-parent) children ...)
(let-values ([(tag attr _) (break-tagged-xexpr (add-parents next-parent parent))])
;; xexpr with tag as name, parent as attr, children as elements with tag as next parent
(make-tagged-xexpr tag attr (map (λ(c) (add-parents c tag)) children)))]
;; single map entry: convert to xexpr with parent
[else (make-tagged-xexpr (->symbol x) (make-xexpr-attr POLLEN_TREE_PARENT_NAME (->string parent)))]))
;; this sets default input for following functions
(define/contract (ptree-root->ptree tx)
;; (not/c ptree) prevents ptrees from being accepted as input
((and/c tagged-xexpr? (not/c ptree?)) . -> . ptree?)
(add-parents tx))
(module+ test
(set! test-ptree-main `(ptree-main "foo" "bar" (one (two "three"))))
(check-equal? (ptree-root->ptree test-ptree-main)
`(ptree-main ((,POLLEN_TREE_PARENT_NAME "")) (foo ((,POLLEN_TREE_PARENT_NAME "ptree-main"))) (bar ((,POLLEN_TREE_PARENT_NAME "ptree-main"))) (one ((,POLLEN_TREE_PARENT_NAME "ptree-main")) (two ((,POLLEN_TREE_PARENT_NAME "one")) (three ((,POLLEN_TREE_PARENT_NAME "two"))))))))
;; contract for ptree-source-decode
(define/contract (valid-pnodes? x)
(any/c . -> . boolean?)
(andmap (λ(x) (pnode? #:loud #t x)) (filter-not whitespace? (flatten x))))
;; contract for ptree-source-decode
(define/contract (unique-pnodes? x)
(any/c . -> . boolean?)
;; use map ->string to make keys comparable
(elements-unique? #:loud #t (map ->string (filter-not whitespace? (flatten x)))))
(define/contract (ptree-source-decode . elements)
(() #:rest (and/c valid-pnodes? unique-pnodes?) . ->* . ptree?)
(ptree-root->ptree (decode (cons POLLEN_TREE_ROOT_NAME elements)
#:xexpr-elements-proc (λ(xs) (filter-not whitespace? xs)))))
(define current-ptree '(empty ((parent "")))) ;; simplest empty ptree that will meet ptree contract
(define/contract (set-current-ptree ptree)
(ptree? . -> . void?)
(set! current-ptree ptree))
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;; create the state variable
(define current-url-context '())
;; create the state variable setter
(define/contract (set-current-url-context x)
((or/c directory-pathish? (listof pathish?)) . -> . void)
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;; try treating x as a directory,
;; otherwise treat it as a list of paths
(set! current-url-context (with-handlers ([exn:fail? (λ(e) x)])
(directory-list x))))
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;; set the state variable using the setter
(set-current-url-context pollen-project-directory)
(module+ main
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(displayln "Running module main")
(set-current-ptree (make-project-ptree (->path "/Users/MB/git/bpt/")))
(set-current-url-context (directory-list "/Users/MB/git/bpt/"))
(pnode->url (previous-pnode (previous-pnode 'what-is-typography))))