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
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  21 ;;; ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
  22 ;;; DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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  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 (defun xsl-number-value (y)
  33   (let ((x (xpath:number-value y)))
  34     (if (or (< x 0.5)
  35             (xpath::nan-p x)
  36             (xpath::inf-p x)
  37             (>= x (expt 2 31))          ;-(
  38             )
  39         (xpath:string-value x)
  40         (round (xpath::xnum-round x)))))
  41
  42 (define-instruction xsl:number (args env)
  43   (destructuring-bind (&key level count from value format lang letter-value
  44                             grouping-separator grouping-size)
  45       args
  46     (let ((count (and count (without-xslt-current ()
  47                               (xpattern:make-pattern-matcher* count env))))
  48           (from  (and from (without-xslt-current ()
  49                              (xpattern:make-pattern-matcher* from env))))
  50           (value (and value (compile-xpath value env)))
  51           (format       (compile-avt (or format "1") env))
  52           (lang         (compile-avt (or lang "") env))
  53           (letter-value (compile-avt (or letter-value "foo") env))
  54           (grouping-separator
  55            (and grouping-separator (compile-avt grouping-separator env)))
  56           (grouping-size (and grouping-size (compile-avt grouping-size env))))
  57       (lambda (ctx)
  58         (let ((value              (when value
  59                                     (xsl-number-value (funcall value ctx))))
  60               (format             (funcall format ctx))
  61               (lang               (funcall lang ctx))
  62               (letter-value       (funcall letter-value ctx))
  63               (grouping-separator (when grouping-separator
  64                                     (funcall grouping-separator ctx)))
  65               (grouping-size      (when grouping-size
  66                                     (xpath:number-value
  67                                      (funcall grouping-size ctx)))))
  68           (if (stringp value)
  69               (write-text value)
  70               (write-text
  71                (format-number-list
  72                 (if value
  73                     (list value)
  74                     (compute-number-list (or level "single")
  75                                          (xpath::context-node ctx)
  76                                          count
  77                                          from))
  78                 format
  79                 lang
  80                 letter-value
  81                 grouping-separator
  82                 grouping-size))))))))
  83
  84 (defun pattern-thunk-matches-p (pattern-thunk node)
  85   (xpattern:matching-value pattern-thunk node))
  86
  87 (defun ancestors-using-count-and-from (node count from)
  88   (let ((ancestors
  89          (xpath::force
  90           (funcall (xpath::axis-function :ancestor-or-self) node))))
  91     (remove-if-not (lambda (ancestor)
  92                      (pattern-thunk-matches-p count ancestor))
  93                    (if from
  94                        (loop
  95                           for a in ancestors
  96                           when (pattern-thunk-matches-p from a)
  97                           do (return result)
  98                           collect a into result
  99                           finally (return ancestors))
 100                        ancestors))))
 101
 102 (defun node-position-among-siblings (node count)
 103   (1+
 104    (count-if (lambda (sibling)
 105                (pattern-thunk-matches-p count sibling))
 106              (xpath::force
 107               (funcall (xpath::axis-function :preceding-sibling) node)))))
 108
 109 (defun node-type (node)
 110   (dolist (type '(:element
 111                   :attribute
 112                   :text
 113                   :document
 114                   :namespace
 115                   :processing-instruction
 116                   :comment))
 117     (when (xpath-protocol:node-type-p node type)
 118       (return type))))
 119
 120 (defun compute-number-list (level node count from)
 121   (unless count
 122     (setf count
 123           (let ((uri (xpath-protocol:namespace-uri node))
 124                 (lname (xpath-protocol:local-name node))
 125                 (node-type (node-type node)))
 126             (lambda (pattern-node)
 127               (if (if (eq node-type :element)
 128                       (and (xpath-protocol:node-type-p pattern-node :element)
 129                            (equal (xpath-protocol:namespace-uri pattern-node)
 130                                   uri)
 131                            (equal (xpath-protocol:local-name pattern-node)
 132                                   lname))
 133                       (xpath-protocol:node-type-p pattern-node node-type))
 134                   (list t)
 135                   nil)))))
 136   (cond
 137     ((equal level "single")
 138      (let ((ancestor (car (ancestors-using-count-and-from node count from))))
 139        (if ancestor
 140            (list (node-position-among-siblings ancestor count))
 141            nil)))
 142     ((equal level "multiple")
 143      (mapcar (lambda (ancestor)
 144                (node-position-among-siblings ancestor count))
 145              (reverse
 146               (ancestors-using-count-and-from node count from))))
 147     ((equal level "any")
 148      (destructuring-bind (root)
 149          (xpath::force (funcall (xpath::axis-function :root) node))
 150        (let ((nodes (xpath::force
 151                      (xpath::append-pipes
 152                       (xpath::subpipe-before
 153                        node
 154                        (funcall (xpath::axis-function :descendant-or-self) root))
 155                       (list node)))))
 156          (when from
 157            (loop
 158               for (current . rest) on nodes
 159               when (pattern-thunk-matches-p from current)
 160               do
 161                 (setf nodes rest)))
 162          (list
 163           (loop
 164              for n in nodes
 165              count (pattern-thunk-matches-p count n))))))
 166     (t
 167      (xslt-error "invalid number level: ~A" level))))
 168
 169 (xpath::deflexer (format-lexer :ignore-whitespace nil)
 170   ;; zzz just enough unicode "support" here to pass the tests
 171   (#.(format nil "([a-zA-Z0-9~A]+)" (code-char 945)) (x) (values :format x))
 172   (#.(format nil "([^a-zA-Z0-9~A]+)" (code-char 945)) (x) (values :text x)))
 173
 174 (defun format-number-token (str n)
 175   (cond
 176     ((or (equal str "a")
 177          (equal str "A")
 178          ;; zzz just enough unicode "support" here to pass the tests
 179          (equal str #.(string (code-char 945))))
 180      (let ((start (char-code (elt str 0)))
 181            (greekp (equal str #.(string (code-char 945)))))
 182        (when (zerop n)
 183          (xslt-error "cannot format zero"))
 184        (nreverse
 185         (with-output-to-string (r)
 186           (loop
 187              for m = n then rest
 188              for (rest digit) = (multiple-value-list
 189                                  (truncate (1- m)
 190                                            (if greekp 25 26)))
 191              do
 192                (cond
 193                  ((plusp rest)
 194                   (write-char (code-char (+ start digit)) r))
 195                  (t
 196                   (write-char (code-char (+ start digit)) r)
 197                   (return))))))))
 198     ((equal str "i")
 199      (if (zerop n)
 200          "0"
 201          (format nil "~(~@R~)" n)))
 202     ((equal str "I")
 203      (if (zerop n)
 204          "0"
 205          (format nil "~@R" n)))
 206     (t
 207      (unless (cl-ppcre:all-matches "^0*1$" str)
 208        ;; unsupported format
 209        (setf str "1"))
 210      (format nil "~v,'0D" (length str) n))))
 211
 212 (defun group-numbers (str separator size stream)
 213   (loop
 214      for c across str
 215      for i from (1- (length str)) downto 0
 216      do
 217        (write-char c stream)
 218        (when (and (plusp size)
 219                   (and (zerop (mod i size)) (plusp i)))
 220          (write-string separator stream))))
 221
 222 ;;; fixme: unicode support
 223 (defun format-number-list
 224     (list format lang letter-value grouping-separator grouping-size)
 225   (declare (ignore lang letter-value))
 226   (if (some #'xpath::nan-p list)
 227       "NaN"
 228       (multiple-value-bind (prefix pairs suffix)
 229           (parse-number-format format)
 230         (with-output-to-string (s)
 231           (write-string prefix s)
 232           (loop
 233              for (separator . subformat) in pairs
 234              for n in (remove 0 list)
 235              for formatted = (format-number-token subformat n)
 236              do
 237              (when separator
 238                (write-string separator s))
 239              (if (and grouping-separator
 240                       grouping-size)
 241                  (group-numbers formatted
 242                                 grouping-separator
 243                                 grouping-size
 244                                 s)
 245                  (write-string formatted s)))
 246           (write-string suffix s)))))
 247
 248 (defun parse-number-format (format)
 249   (let ((lexer (format-lexer format))
 250         (prefix "")
 251         (conses '())
 252         (suffix "")
 253         (current-text nil))
 254     (loop
 255        (multiple-value-bind (type str) (funcall lexer)
 256          (ecase type
 257            ((nil :eof)
 258             (return))
 259            (:text
 260             (if conses
 261                 (setf current-text str)
 262                 (setf prefix str)))
 263            (:format
 264             (push (cons (if conses
 265                             (or current-text ".")
 266                             nil)
 267                         str)
 268                   conses)
 269             (setf current-text nil)))))
 270     (cond
 271       (current-text
 272        (setf suffix current-text))
 273       ((null conses)
 274        (setf suffix prefix)))
 275     (unless conses
 276       (setf conses (list (cons nil "1"))))
 277     (let* ((tail-cons (car conses))
 278            (tail (if (car tail-cons)
 279                      conses
 280                      (push (cons "." (cdr tail-cons)) conses))))
 281       (setf conses (nreverse conses))
 282       (setf (cdr tail) tail))
 283     (values prefix conses suffix)))