cleaned up pmap parsing

main.rkt

@@ -2,6 +2,7 @@
 (require racket/list)
 (require (planet mb/pollen/tools) (planet mb/pollen/main-helper))
 (require (only-in (planet mb/pollen/pmap) pmap-decode))
+(require (only-in (planet mb/pollen/predicates) pmap?))
 (require (only-in (planet mb/pollen/pollen-file-tools) has-ext?))
 (require (only-in (planet mb/pollen/world) POLLEN_MAP_EXT))
 (provide (except-out (all-from-out racket/base) #%module-begin)
@@ -10,30 +11,35 @@
 (define-syntax-rule (module-begin expr ...)
   (#%module-begin
    
-   ; this is here only so that dynamic-rerequire of a pollen module
-   ; transitively reloads the extras also.
-   ; if this isn't here, then dynamic-rerequire can't see them
-   ; and thus they are not tracked for changes.
+   ;; this is here only so that dynamic-rerequire of a pollen module
+   ;; transitively reloads the extras also.
+   ;; if this isn't here, then dynamic-rerequire can't see them
+   ;; and thus they are not tracked for changes.
    (require-extras)
    
-   ; We want our module language to support require & provide
-   ; which are only supported at the module level, so ...
-   ; create a submodule to contain the input
-   ; and export as needed
+   ;; We want our module language to support require & provide
+   ;; which are only supported at the module level, so ...
+   ;; create a submodule to contain the input
+   ;; and export as needed
    
-   ; doclang2_raw is a clone of scribble/doclang2 with decode disabled
-   ; helpful because it collects & exports content via 'doc
+   ;; doclang2_raw is a clone of scribble/doclang2 with decode disabled
+   ;; helpful because it collects & exports content via 'doc
    (module pollen-inner (planet mb/pollen/lang/doclang2_raw)
-     ; use same requires as top of main.rkt 
-     ; (can't import them from surrounding module due to submodule rules)
+     ;; use same requires as top of main.rkt 
+     ;; (can't import them from surrounding module due to submodule rules)
      (require (planet mb/pollen/tools) (planet mb/pollen/main-helper))
+     (require (only-in (planet mb/pollen/pmap) pmap-subtopic))
      (require-extras #:provide #t) ; brings in the project require files
      
-     ; #%top binding catches ids that aren't defined
-     ; here, convert them to basic xexpr
-     ; #%top is a syntax transformer that returns a function
-     ; λ x captures all the args (vs. λ(x), which only catches one)
-     ; and id is not spliced because it's syntax, not a true variable
+     ;; #%top binding catches ids that aren't defined
+     ;; here, convert them to basic xexpr
+     ;; #%top is a syntax transformer that returns a function
+     ;; λ x captures all the args (vs. λ(x), which only catches one)
+     ;; and id is not spliced because it's syntax, not a true variable
+     ;; WARNING! This is convenient for writing pollen documents
+     ;; (which is why it works this way)
+     ;; but it makes debugging tricky, because an undefined (symbol item ...)
+     ;; is just treated as a valid tagged-xexpr, not an undefined function.
      (define-syntax-rule (#%top . id)
        (λ x `(id ,@x)))
      
@@ -48,25 +54,35 @@
    
    ;; prepare the elements, and append inner-here as meta.
    (define all-elements (append 
+                         ;; append inner-here as meta
+                         ;; put it first so it can be overridden by custom meta later on
+                         (list `(meta "here" ,inner-here)) 
                          (cond
                            ;; doc is probably a list, but might be a single string
                            [(string? doc) (list doc)] 
                            [(tagged-xexpr? doc) (list doc)] ; if it's a single nx, just leave it
-                           [(list? doc) doc]) ; if it's nx content, splice it in
-                         (list `(meta "here" ,inner-here)))) ; append inner-here as meta
+                           [(list? doc) doc]))) ; if it's nx content, splice it in
+                         
    
    ;; split out the metas now (in raw form)
-   (define-values (main-raw metas-raw) 
-     (extract-tag-from-xexpr 'meta (make-tagged-xexpr 'irrelevant-tag empty all-elements)))
+   (define-values (metas-raw main-raw) 
+     (split-tag-from-xexpr 'meta (make-tagged-xexpr 'irrelevant-tag empty all-elements)))
    
    (define metas (make-meta-hash metas-raw))
    
    ;; Policy: here in the core lang, do as little to main as possible.
    ;; The point is just to set it up for further processing.
-   ;; One of the annoyances of Scribble is its insistence on decoding.
-   ;; Better just to pass through the minimally processed data.
+   ;; Unlike Scribble, which insists on decoding,
+   ;; Pollen just passes through the minimally processed data.
    ;; one exception: if file extension marks it as pmap, send it to the pmap decoder instead.
-   (define main (apply (if ((->path (get metas "here")) . has-ext? . POLLEN_MAP_EXT)
+   (define source-is-pmap? 
+   ;; this tests inner-here (which is always the file name)
+     ;; rather than (get metas 'here) which might have been overridden.
+     ;; Because if it's overridden to something other than *.pmap, 
+     ;; pmap processing will fail.
+     ;; This defeats rule that pmap file suffix triggers pmap decoding.
+     ((->path inner-here) . has-ext? . POLLEN_MAP_EXT))
+   (define main (apply (if source-is-pmap?
                            pmap-decode
                            ;; most files will go this way.
                            ;; Root is treated as a function. 
@@ -80,11 +96,14 @@
    
    (module+ main
      (displayln ";-------------------------")
-     (displayln "; pollen decoded 'main")     
+     (displayln (string-append "; pollen decoded 'main" (if source-is-pmap? " (as pmap)" "")))     
      (displayln ";-------------------------")
      main
      (displayln "")
-     (displayln (format "(tagged-xexpr? main) ~a" (tagged-xexpr? main)))
+     
+     (if source-is-pmap?
+         (displayln (format "(pmap? main) ~a" (pmap? main)))
+         (displayln (format "(tagged-xexpr? main) ~a" (tagged-xexpr? main))))
      (displayln "")
      (displayln ";-------------------------")
      (displayln "; pollen 'metas")

pmap.rkt

@@ -10,10 +10,12 @@
 (define pmap-file (build-path START_DIR DEFAULT_MAP))
 (define pmap-main empty)
 
-; make these independent of local includes
-(define (pmap-subtopic topic . subtopics)
-  (make-tagged-xexpr (->symbol topic) empty (filter-not whitespace? subtopics)))
+;; handle pmap-subtopics
+(define/contract (pmap-subtopic topic . subtopics)
+  ((string?) #:rest (listof xexpr-element?) . ->* . tagged-xexpr?)
+  (make-tagged-xexpr (->symbol topic) empty subtopics))
 
+;; todo: tests for pmap-subtopics
 
 
 ;; todo: this ain't a function
@@ -25,16 +27,6 @@
       (set! files (map remove-ext (filter (λ(x) (has-ext? x POLLEN_SOURCE_EXT)) files)))
       (set! pmap-main (make-tagged-xexpr 'map-main empty (map path->string files)))))
 
-;; todo: restrict this test 
-;; all names must be unique
-(define/contract (pmap? x)
-  (any/c . -> . boolean?)
-  (and (tagged-xexpr? x) 
-       ;; all locations must be unique. Check this by converting x to a list of strings ...
-       (let ([locations (map ->string (flatten (remove-attrs x)))])
-         ;; and then coercing to set (because set impliedly enforces uniqueness)
-         ;; If set has same number of elements as original, all are unique.
-         (= (len (apply set locations)) (len locations)))))
 
 ;; recursively processes map, converting map locations & their parents into xexprs of this shape:
 ;; '(location ((parent "parent")))
@@ -54,9 +46,21 @@
 
 (module+ test
   (define test-pmap-main `(pmap-main "foo" "bar" ,(pmap-subtopic "one" (pmap-subtopic "two" "three"))))
-  (check-equal? (add-parents test-pmap-main) 
+  (check-equal? (main->pmap test-pmap-main) 
                 '(pmap-main ((parent "")) (foo ((parent "pmap-main"))) (bar ((parent "pmap-main"))) (one ((parent "pmap-main")) (two ((parent "one")) (three ((parent "two"))))))))
 
+
+
+;; this sets default input for following functions
+(define/contract (main->pmap tx)
+  (tagged-xexpr? . -> . pmap?)
+  (add-parents tx))
+
+(define pmap (main->pmap pmap-main))
+
+
+
+
 ;; remove parents from map (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) 
@@ -69,27 +73,15 @@
                              (one ((parent "")) (two ((parent "one")) (three ((parent "two")))))))
                 '(pmap-main (foo) (bar) (one (two (three))))))
 
-;; todo: what is this for?
-(define/contract (main->pmap main)
-  (tagged-xexpr? . -> . pmap?)
-  (let-values ([(nx metas) (extract-tag-from-xexpr 'meta main)])
-    (add-parents nx)))
 
 (module+ test
-  (define mt-pmap `(pmap-main "foo" "bar" ,(pmap-subtopic "one" (pmap-subtopic "two" "three")) (meta "foo" "bar")))
-  (check-equal? (main->pmap mt-pmap) 
-                '(pmap-main ((parent "")) (foo ((parent "pmap-main"))) (bar ((parent "pmap-main"))) (one ((parent "pmap-main")) (two ((parent "one")) (three ((parent "two"))))))))
+  (define sample-main `(pmap-root "foo" "bar" ,(pmap-subtopic "one" (pmap-subtopic "two" "three"))))
+  (check-equal? (main->pmap sample-main) 
+                '(pmap-root ((parent "")) (foo ((parent "pmap-root"))) (bar ((parent "pmap-root"))) (one ((parent "pmap-root")) (two ((parent "one")) (three ((parent "two"))))))))
 
 
-;; todo: what is this for? to have default input?
-(define pmap (main->pmap pmap-main))
 
 
-(define/contract (pmap-key? x)
-  (any/c . -> . boolean?)
-  ;; OK for map-key to be #f
-  (or (symbol? x) (string? x) (eq? x #f)))
-
 ;; return the parent of a given name
 (define/contract (parent element [pmap pmap])
   ((pmap-key?) (pmap?) . ->* . (or/c string? boolean?)) 
@@ -255,13 +247,33 @@
   (check-equal? (next-page 'one test-pmap) "two")
   (check-false (next-page 'three test-pmap)))
 
-(module+ test
+#|(module+ test
   ;; need to parameterize current-directory
   ;; because pollen main depends on it to find the include functions
   (define pm (parameterize ([current-directory "./tests/"])
-               (main->pmap (dynamic-require "test-pmap.p" 'main))))
+               (main->pmap (dynamic-require "test.pmap" 'main))))
   (check-equal? (previous-page (parent 'printers-and-paper pm) pm) "ligatures"))
+|#
+
 
 (define/contract (pmap-decode . elements)
-  (() #:rest xexpr-elements? . ->* . any/c)
-  "hello, this is pmap-decode")
+  (() #:rest (and/c
+              ;; todo: how to put these contracts under a let?
+              ;; all elements must be valid pmap keys
+              (flat-named-contract 'valid-pmap-keys
+                                   (λ(e) (andmap (λ(x) (pmap-key? #:loud #t x)) 
+                                                 (filter-not whitespace? (flatten e)))))
+              ;; they must also be unique
+              (flat-named-contract 'unique-pmap-keys
+                                   (λ(e) (elements-unique? #:loud #t 
+                                          (map ->string ; to make keys comparable
+                                               (filter-not whitespace? (flatten e)))))))
+      . ->* . pmap?)
+  (main->pmap (decode (cons 'pmap-root elements)
+          ;          #:exclude-xexpr-tags 'em
+          ;          #:xexpr-tag-proc [xexpr-tag-proc (λ(x)x)]
+          ;          #:xexpr-attr-proc [xexpr-attr-proc (λ(x)x)]
+          #:xexpr-elements-proc (λ(xs) (filter-not whitespace? xs))
+          ; #:block-xexpr-proc block-xexpr-proc
+          ;          #:inline-xexpr-proc [inline-xexpr-proc (λ(x)x)]
+          )))

predicates.rkt

@@ -1,11 +1,12 @@
 #lang racket/base
-(require racket/contract racket/match racket/list xml)
+(require racket/contract racket/match racket/list xml racket/set)
 (require (prefix-in scribble: (only-in scribble/decode whitespace?)))
 (require (prefix-in html: "library/html.rkt"))
 (require "world.rkt" "readability.rkt" "pollen-file-tools.rkt")
 
 (module+ test (require rackunit))
 
+
 (provide (all-defined-out)
          (all-from-out "pollen-file-tools.rkt"))
 
@@ -112,18 +113,80 @@
   (check-false (meta-xexpr? '(meta "key" "value" "foo")))
   (check-false (meta-xexpr? '(meta))))
 
+;; exploit uniqueness constraint of set data structure
+(define/contract (elements-unique? x #:loud [loud #f])
+  ((any/c) (#:loud boolean?) . ->* . boolean?)
+  (define result 
+    (cond 
+      [(list? x) (= (len (apply set x)) (len x))]
+      [(vector? x) (elements-unique? (->list x))]
+      [(string? x) (elements-unique? (string->list x))]
+      [else #t]))
+  (if (and (not result) loud)
+      ;; todo: calculate nonunique keys
+      (error "Not unique keys:" x)
+      result))
+
+(module+ test
+  (check-true (elements-unique? '(1 2 3)))
+  (check-false (elements-unique? '(1 2 2)))
+  (check-true (elements-unique? (->vector '(1 2 3))))
+  (check-false (elements-unique? (->vector '(1 2 2))))
+  (check-true (elements-unique? "fob"))
+  (check-false (elements-unique? "foo")))
+
+
+;; todo: how to restrict this test?
+;; pmap requirements are enforced at compile-time.
+;; (such as pmap-keys must be unique).
+;; (and every element must have a parent attr).
+;; otherwise this becomes a rather expensive contract
+;; because every function in pmap.rkt uses it
+(define/contract (pmap? x)
+  (any/c . -> . boolean?)
+  (tagged-xexpr? x))
+
+
+;; pmap location must represent a possible valid filename
+(define/contract (pmap-key? x #:loud [loud #f])
+  ((any/c) (#:loud boolean?) . ->* . boolean?)
+  ;; todo: how to express the fact that the pmap-location must be 
+  ;; a valid base name for a file?
+  ;; however, don't restrict it to existing files 
+  ;; (author may want to use pmap as wireframe)
+  (define result 
+    (or  (eq? x #f) ; OK for map-key to be #f
+         (and (or (symbol? x) (string? x)) 
+              (not (= (len x) 0)) ; not empty
+              ; no whitespace
+              (andmap (compose not whitespace?) (map ->string (string->list (->string x)))))))
+  (if (and (not result) loud)
+      (error "Not a valid pmap key:" x)
+      result))
+
+(module+ test
+  (check-true (pmap-key? #f))
+  (check-true (pmap-key? "foo-bar"))
+  (check-true (pmap-key? 'foo-bar))
+  (check-false (pmap-key? ""))
+  (check-false (pmap-key? " ")))
+
 
 ;; recursive whitespace test
 ;; Scribble's version misses whitespace in a list
-(define (whitespace? x)
+(define/contract (whitespace? x)
+  (any/c . -> . boolean?)
   (cond
-    [(list? x) (andmap whitespace? x)]
-    [else (scribble:whitespace? x)]))
+    [(or (vector? x) (list? x) (set? x)) (andmap whitespace? (->list x))]
+    [(or (symbol? x) (string? x)) (->boolean (regexp-match #px"^\\s+$" (->string x)))]
+    [else #f]))
 
 (module+ test
   (check-true (whitespace? " "))
   (check-false (whitespace? "foo"))
-  (check-false (whitespace? " ")) ; a nonbreaking space
+  (check-false (whitespace? 'foo))
+  (check-false (whitespace? #\Ø))
+  (check-false (whitespace? " ")) ; a nonbreaking space. todo: why is this so?
   (check-true (whitespace? "\n \n"))
   (check-true (whitespace? (list "\n" " " "\n")))
   (check-true (whitespace? (list "\n" " " "\n" (list "\n" "\n")))))

readability.rkt

@@ -61,6 +61,15 @@
   (check-equal? (->list (set 1 2 3)) '(1 2 3))
   (check-equal? (->list "foo") (list "foo")))
 
+;; general way of coercing to vector
+(define (->vector x)
+  (any/c . -> . vector?)
+  ; todo: on bad input, it will pop a list error rather than vector error
+  (cond
+    [(vector? x) x]
+    [else (list->vector (->list x))]))
+
+
 
 ;; general way of coercing to boolean
 (define/contract (->boolean x)

tests/test-pmap.p

@@ -1,26 +0,0 @@
-#lang planet mb/pollen
-
-◊pmap-topic{index
-    typography-in-ten-minutes
-    summary-of-key-rules
-    foreword
-    introduction
-    how-to-use
-    how-to-pay-for-this-book
-    ◊pmap-topic{why-typography-matters
-          what-is-typography
-          where-do-the-rules-come-from}
-    ◊pmap-topic{type-composition
-          straight-and-curly-quotes
-          one-space-between-sentences
-          trademark-and-copyright-symbols
-          ligatures}
-    ◊pmap-topic{appendix
-        printers-and-paper
-        how-to-make-a-pdf
-        typewriter-habits
-        common-accented-characters
-        identifying-fonts
-        bibliography
-        charter
-        mb-lectures-and-articles}}

tests/test.pmap

@@ -23,4 +23,5 @@ how-to-pay-for-this-book
                identifying-fonts
                bibliography
                charter
-               mb-lectures-and-articles}
+               mb-lectures-and-articles}
+

tools.rkt

@@ -5,7 +5,6 @@
 (require (only-in racket/string string-join))
 (require (only-in xml xexpr? xexpr/c))
 
-
 (require "readability.rkt" "debug.rkt" "predicates.rkt")
 (provide (all-defined-out) (all-from-out "readability.rkt" "debug.rkt" "predicates.rkt"))
 
@@ -174,9 +173,10 @@
   (check-equal? (map-tree (λ(i) (if (symbol? i) 'foo i)) '(p 1 2 3 (em 4 5))) '(foo 1 2 3 (foo 4 5))))
 
 
-;; function to strip metas (or any tag)
-(define/contract (extract-tag-from-xexpr tag nx)
-  (xexpr-tag? tagged-xexpr? . -> . (values tagged-xexpr? xexpr-elements?))
+
+;; function to split tag out of tagged-xexpr
+(define/contract (split-tag-from-xexpr tag tx)
+  (xexpr-tag? tagged-xexpr? . -> . (values xexpr-elements? tagged-xexpr? ))
   (define matches '())
   (define (extract-tag x)
     (cond
@@ -189,25 +189,28 @@
                            (make-tagged-xexpr tag attr (extract-tag body)))]
       [(xexpr-elements? x) (filter-not empty? (map extract-tag x))]
       [else x]))
-  (values (extract-tag nx) (reverse matches))) 
+  (define tx-extracted (extract-tag tx)) ;; do this first to fill matches
+  (values (reverse matches) tx-extracted)) 
 
 
 (module+ test
-  (define x '(root (meta "foo" "bar") "hello" "world" (meta "foo2" "bar2") 
+  (define xx '(root (meta "foo" "bar") "hello" "world" (meta "foo2" "bar2") 
                    (em "goodnight" "moon" (meta "foo3" "bar3"))))
   
-  (check-equal? (values->list (extract-tag-from-xexpr 'meta x)) 
-                (list '(root "hello" "world" (em "goodnight" "moon"))
-                      '((meta "foo" "bar") (meta "foo2" "bar2") (meta "foo3" "bar3")))))
-
+  (check-equal? (values->list (split-tag-from-xexpr 'meta xx)) 
+                (list '((meta "foo" "bar") (meta "foo2" "bar2") (meta "foo3" "bar3")) 
+                 '(root "hello" "world" (em "goodnight" "moon")))))
 
 
 ;; convert list of meta tags to a hash for export from pollen document.
 ;; every meta is form (meta "key" "value") (enforced by contract)
+;; later metas with the same name will override earlier ones.
 (define/contract (make-meta-hash mxs)
   ((listof meta-xexpr?) . -> . hash?)
   (apply hash (append-map tagged-xexpr-elements mxs)))
 
 (module+ test
   (check-equal? (make-meta-hash '((meta "foo" "bar")(meta "hee" "haw")))
-                (hash "foo" "bar" "hee" "haw")))
+                (hash "foo" "bar" "hee" "haw"))
+  (check-equal? (make-meta-hash '((meta "foo" "bar")(meta "foo" "haw")))
+                (hash "foo" "haw")))