number.lisp

   1 ;;; -*- show-trailing-whitespace: t; indent-tabs-mode: nil -*-
   2
   3 ;;; Copyright (c) 2007,2008 David Lichteblau, Ivan Shvedunov.
   4 ;;; All rights reserved.
   5
   6 ;;; Redistribution and use in source and binary forms, with or without
   7 ;;; modification, are permitted provided that the following conditions
   8 ;;; are met:
   9 ;;;
  10 ;;;   * Redistributions of source code must retain the above copyright
  11 ;;;     notice, this list of conditions and the following disclaimer.
  12 ;;;
  13 ;;;   * Redistributions in binary form must reproduce the above
  14 ;;;     copyright notice, this list of conditions and the following
  15 ;;;     disclaimer in the documentation and/or other materials
  16 ;;;     provided with the distribution.
  17 ;;;
  18 ;;; THIS SOFTWARE IS PROVIDED BY THE AUTHOR 'AS IS' AND ANY EXPRESSED
  19 ;;; OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  20 ;;; WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  21 ;;; ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
  22 ;;; DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  23 ;;; DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
  24 ;;; GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  25 ;;; INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  26 ;;; WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  27 ;;; NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  28 ;;; SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29
  30 (in-package :xuriella)
  31
  32 (define-instruction xsl:number (args env)
  33   (destructuring-bind (&key level count from value format lang letter-value
  34                             grouping-separator grouping-size)
  35       args
  36     (let ((count (and count (xpath:make-pattern-matcher* count env)))
  37           (from  (and from (xpath:make-pattern-matcher* from env)))
  38           (value (and value (compile-xpath value env)))
  39           (format       (compile-avt (or format "1") env))
  40           (lang         (compile-avt (or lang "") env))
  41           (letter-value (compile-avt (or letter-value "foo") env))
  42           (grouping-separator
  43            (and grouping-separator (compile-avt grouping-separator env)))
  44           (grouping-size (and grouping-size (compile-avt grouping-size env))))
  45       (lambda (ctx)
  46         (let ((value              (when value
  47                                     (let ((x
  48                                            (xpath:number-value
  49                                             (funcall value ctx))))
  50                                       (if (xpath::nan-p x)
  51                                           x
  52                                           (round (xpath::xnum-round x))))))
  53               (format             (funcall format ctx))
  54               (lang               (funcall lang ctx))
  55               (letter-value       (funcall letter-value ctx))
  56               (grouping-separator (when grouping-separator
  57                                     (funcall grouping-separator ctx)))
  58               (grouping-size      (when grouping-size
  59                                     (xpath:number-value
  60                                      (funcall grouping-size ctx)))))
  61           (write-text
  62            (format-number-list
  63             (if value
  64                 (list value)
  65                 (compute-number-list (or level "single")
  66                                      (xpath::context-node ctx)
  67                                      count
  68                                      from))
  69             format
  70             lang
  71             letter-value
  72             grouping-separator
  73             grouping-size)))))))
  74
  75 (defun pattern-thunk-matches-p (pattern-thunk node)
  76   (xpath:matching-value pattern-thunk node))
  77
  78 (defun ancestors-using-count-and-from (node count from)
  79   (let ((ancestors
  80          (xpath::force
  81           (funcall (xpath::axis-function :ancestor-or-self) node))))
  82     (remove-if-not (lambda (ancestor)
  83                      (pattern-thunk-matches-p count ancestor))
  84                    (if from
  85                        (loop
  86                           for a in ancestors
  87                           when (pattern-thunk-matches-p from a)
  88                           do (return result)
  89                           collect a into result
  90                           finally (return ancestors))
  91                        ancestors))))
  92
  93 (defun node-position-among-siblings (node count)
  94   (1+
  95    (count-if (lambda (sibling)
  96                (pattern-thunk-matches-p count sibling))
  97              (xpath::force
  98               (funcall (xpath::axis-function :preceding-sibling) node)))))
  99
 100 (defun node-type (node)
 101   (dolist (type '(:element
 102                   :attribute
 103                   :text
 104                   :document
 105                   :namespace
 106                   :processing-instruction
 107                   :comment))
 108     (when (xpath-protocol:node-type-p node type)
 109       (return type))))
 110
 111 (defun compute-number-list (level node count from)
 112   (unless count
 113     (setf count
 114           (let ((uri (xpath-protocol:namespace-uri node))
 115                 (lname (xpath-protocol:local-name node))
 116                 (node-type (node-type node)))
 117             (lambda (pattern-node)
 118               (if (if (eq node-type :element)
 119                       (and (xpath-protocol:node-type-p pattern-node :element)
 120                            (equal (xpath-protocol:namespace-uri pattern-node)
 121                                   uri)
 122                            (equal (xpath-protocol:local-name pattern-node)
 123                                   lname))
 124                       (xpath-protocol:node-type-p pattern-node node-type))
 125                   (list t)
 126                   nil)))))
 127   (cond
 128     ((equal level "single")
 129      (let ((ancestor (car (ancestors-using-count-and-from node count from))))
 130        (if ancestor
 131            (list (node-position-among-siblings ancestor count))
 132            nil)))
 133     ((equal level "multiple")
 134      (mapcar (lambda (ancestor)
 135                (node-position-among-siblings ancestor count))
 136              (reverse
 137               (ancestors-using-count-and-from node count from))))
 138     ((equal level "any")
 139      (destructuring-bind (root)
 140          (xpath::force (funcall (xpath::axis-function :root) node))
 141        (let ((nodes (xpath::force
 142                      (xpath::append-pipes
 143                       (xpath::subpipe-before
 144                        node
 145                        (funcall (xpath::axis-function :descendant-or-self) root))
 146                       (list node)))))
 147          (when from
 148            (loop
 149               for (current . rest) on nodes
 150               when (pattern-thunk-matches-p from current)
 151               do
 152                 (setf nodes rest)))
 153          (list
 154           (loop
 155              for n in nodes
 156              count (pattern-thunk-matches-p count n))))))
 157     (t
 158      (xslt-error "invalid number level: ~A" level))))
 159
 160 (xpath::deflexer (format-lexer :ignore-whitespace nil)
 161   ;; zzz just enough unicode "support" here to pass the tests
 162   (#.(format nil "([a-zA-Z0-9~A]+)" (code-char 945)) (x) (values :format x))
 163   (#.(format nil "([^a-zA-Z0-9~A]+)" (code-char 945)) (x) (values :text x)))
 164
 165 (defun format-number-token (str n)
 166   (cond
 167     ((or (equal str "a")
 168          (equal str "A")
 169          ;; zzz just enough unicode "support" here to pass the tests
 170          (equal str #.(string (code-char 945))))
 171      (let ((start (char-code (elt str 0)))
 172            (greekp (equal str #.(string (code-char 945)))))
 173        (when (zerop n)
 174          (xslt-error "cannot format zero"))
 175        (nreverse
 176         (with-output-to-string (r)
 177           (loop
 178              for m = n then rest
 179              for (rest digit) = (multiple-value-list
 180                                  (truncate (1- m)
 181                                            (if greekp 25 26)))
 182              do
 183                (cond
 184                  ((plusp rest)
 185                   (write-char (code-char (+ start digit)) r))
 186                  (t
 187                   (write-char (code-char (+ start digit)) r)
 188                   (return))))))))
 189     ((equal str "i")
 190      (if (zerop n)
 191          "0"
 192          (format nil "~(~@R~)" n)))
 193     ((equal str "I")
 194      (if (zerop n)
 195          "0"
 196          (format nil "~@R" n)))
 197     (t
 198      (unless (cl-ppcre:all-matches "^0*1$" str)
 199        ;; unsupported format
 200        (setf str "1"))
 201      (format nil "~v,'0D" (length str) n))))
 202
 203 (defun group-numbers (str separator size stream)
 204   (loop
 205      for c across str
 206      for i from (1- (length str)) downto 0
 207      do
 208        (write-char c stream)
 209        (when (and (zerop (mod i size)) (plusp i))
 210          (write-string separator stream))))
 211
 212 ;;; fixme: unicode support
 213 (defun format-number-list
 214     (list format lang letter-value grouping-separator grouping-size)
 215   (declare (ignore lang letter-value))
 216   (if (some #'xpath::nan-p list)
 217       "NaN"
 218       (multiple-value-bind (prefix pairs suffix)
 219           (parse-number-format format)
 220         (with-output-to-string (s)
 221           (write-string prefix s)
 222           (loop
 223              for (separator . subformat) in pairs
 224              for n in list
 225              for formatted = (format-number-token subformat n)
 226              do
 227              (when separator
 228                (write-string separator s))
 229              (if (and grouping-separator
 230                       grouping-size)
 231                  (group-numbers formatted
 232                                 grouping-separator
 233                                 grouping-size
 234                                 s)
 235                  (write-string formatted s)))
 236           (write-string suffix s)))))
 237
 238 (defun parse-number-format (format)
 239   (let ((lexer (format-lexer format))
 240         (prefix "")
 241         (conses '())
 242         (suffix "")
 243         (current-text nil))
 244     (loop
 245        (multiple-value-bind (type str) (funcall lexer)
 246          (ecase type
 247            ((nil :eof)
 248             (return))
 249            (:text
 250             (if conses
 251                 (setf current-text str)
 252                 (setf prefix str)))
 253            (:format
 254             (push (cons (if conses
 255                             (or current-text ".")
 256                             nil)
 257                         str)
 258                   conses)
 259             (setf current-text nil)))))
 260     (when current-text
 261       (setf suffix current-text))
 262     (unless conses
 263       (setf conses (list (cons nil "1"))))
 264     (let* ((tail-cons (car conses))
 265            (tail (if (car tail-cons)
 266                      conses
 267                      (push (cons "." (cdr tail-cons)) conses))))
 268       (setf conses (nreverse conses))
 269       (setf (cdr tail) tail))
 270     (values prefix conses suffix)))