klacks/tap-source.lisp

   1 ;;; -*- Mode: Lisp; readtable: runes; -*-
   2 ;;;  (c) copyright 2007 David Lichteblau
   3
   4 ;;; This library is free software; you can redistribute it and/or
   5 ;;; modify it under the terms of the GNU Library General Public
   6 ;;; License as published by the Free Software Foundation; either
   7 ;;; version 2 of the License, or (at your option) any later version.
   8 ;;;
   9 ;;; This library is distributed in the hope that it will be useful,
  10 ;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12 ;;; Library General Public License for more details.
  13 ;;;
  14 ;;; You should have received a copy of the GNU Library General Public
  15 ;;; License along with this library; if not, write to the
  16 ;;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17 ;;; Boston, MA  02111-1307  USA.
  18
  19 (in-package :cxml)
  20
  21 (defun klacks:make-tapping-source (upstream-source &optional sax-handler)
  22   (make-instance 'klacks:tapping-source
  23                  :upstream-source upstream-source
  24                  :dribble-handler sax-handler))
  25
  26 (defclass klacks:tapping-source (klacks:source)
  27     ((upstream-source :initarg :upstream-source :accessor upstream-source)
  28      (dribble-handler :initarg :dribble-handler :accessor dribble-handler)
  29      (seen-event-p :initform nil :accessor seen-event-p)))
  30
  31 (defmethod initialize-instance :after ((instance klacks:tapping-source) &key)
  32   (let ((s-p (make-instance 'klacksax :source (upstream-source instance))))
  33     (sax:register-sax-parser (dribble-handler instance) s-p)))
  34
  35
  36 ;;; event dribbling
  37
  38 (defun maybe-dribble (source)
  39   (unless (seen-event-p source)
  40     (klacks:serialize-event (upstream-source source)
  41                             (dribble-handler source)
  42                             :consume nil)
  43     (setf (seen-event-p source) t)))
  44
  45 (defmethod klacks:peek ((source klacks:tapping-source))
  46   (multiple-value-prog1
  47       (klacks:peek (upstream-source source))
  48     (maybe-dribble source)))
  49
  50 (defmethod klacks:peek-value ((source klacks:tapping-source))
  51   (multiple-value-prog1
  52       (klacks:peek-value (upstream-source source))
  53     (maybe-dribble source)))
  54
  55 (defmethod klacks:peek-next ((source klacks:tapping-source))
  56   (setf (seen-event-p source) nil)
  57   (multiple-value-prog1
  58       (klacks:peek-next (upstream-source source))
  59     (maybe-dribble source)))
  60
  61 (defmethod klacks:consume ((source klacks:tapping-source))
  62   (maybe-dribble source)
  63   (multiple-value-prog1
  64       (klacks:consume (upstream-source source))
  65     (setf (seen-event-p source) nil)))
  66
  67
  68 ;;; loop through
  69
  70 (defmethod klacks:close-source ((source klacks:tapping-source))
  71   (klacks:close-source (upstream-source source)))
  72
  73 (defmethod klacks:map-attributes (fn (source klacks:tapping-source))
  74   (klacks:map-attributes fn (upstream-source source)))
  75
  76 (defmethod klacks:map-current-namespace-declarations
  77     (fn (source klacks:tapping-source))
  78   (klacks:map-current-namespace-declarations fn (upstream-source source)))
  79
  80 (defmethod klacks:list-attributes ((source klacks:tapping-source))
  81   (klacks:list-attributes (upstream-source source)))
  82
  83 (defmethod klacks:current-line-number ((source klacks:tapping-source))
  84   (klacks:current-line-number (upstream-source source)))
  85
  86 (defmethod klacks:current-column-number ((source klacks:tapping-source))
  87   (klacks:current-column-number (upstream-source source)))
  88
  89 (defmethod klacks:current-system-id ((source klacks:tapping-source))
  90   (klacks:current-system-id (upstream-source source)))
  91
  92 (defmethod klacks:current-xml-base ((source klacks:tapping-source))
  93   (klacks:current-xml-base (upstream-source source)))
  94
  95 (defmethod klacks:current-cdata-section-p ((source klacks:tapping-source))
  96   (klacks:current-cdata-section-p (upstream-source source)))
  97
  98 (defmethod klacks:find-namespace-binding
  99     (prefix (source klacks:tapping-source))
 100   (klacks:find-namespace-binding prefix (upstream-source source)))
 101
 102 (defmethod klacks:decode-qname (qname (source klacks:tapping-source))
 103   (klacks:decode-qname qname (upstream-source source)))