65 lines
2 KiB
Common Lisp
65 lines
2 KiB
Common Lisp
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;;;; -*- mode: lisp -*-
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;;;;
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;;;; $Id: echo.lisp,v 1.1 2005/08/17 13:44:30 scaekenberghe Exp $
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;;;;
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;;;; A simple example as well as a useful tool: parse, echo and pretty print XML
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;;;;
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;;;; Copyright (C) 2002, 2004 Sven Van Caekenberghe, Beta Nine BVBA.
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;;;;
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;;;; You are granted the rights to distribute and use this software
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;;;; as governed by the terms of the Lisp Lesser General Public License
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;;;; (http://opensource.franz.com/preamble.html), also known as the LLGPL.
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(in-package :s-xml)
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(defun indent (stream count)
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(loop :repeat (* count 2) :do (write-char #\space stream)))
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(defclass echo-xml-seed ()
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((stream :initarg :stream)
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(level :initarg :level :initform 0)))
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#+NIL
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(defmethod print-object ((seed echo-xml-seed) stream)
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(with-slots (stream level) seed
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(print-unreadable-object (seed stream :type t)
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(format stream "level=~d" level))))
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(defun echo-xml-new-element-hook (name attributes seed)
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(with-slots (stream level) seed
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(indent stream level)
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(format stream "<~a" name)
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(dolist (attribute (reverse attributes))
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(format stream " ~a=\'" (car attribute))
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(print-string-xml (cdr attribute) stream)
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(write-char #\' stream))
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(format stream ">~%")
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(incf level)
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seed))
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(defun echo-xml-finish-element-hook (name attributes parent-seed seed)
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(declare (ignore attributes parent-seed))
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(with-slots (stream level) seed
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(decf level)
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(indent stream level)
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(format stream "</~a>~%" name)
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seed))
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(defun echo-xml-text-hook (string seed)
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(with-slots (stream level) seed
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(indent stream level)
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(print-string-xml string stream)
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(terpri stream)
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seed))
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(defun echo-xml (in out)
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"Parse a toplevel XML element from stream in, echoing and pretty printing the result to stream out"
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(start-parse-xml in
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(make-instance 'xml-parser-state
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:seed (make-instance 'echo-xml-seed :stream out)
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:new-element-hook #'echo-xml-new-element-hook
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:finish-element-hook #'echo-xml-finish-element-hook
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:text-hook #'echo-xml-text-hook)))
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;;;; eof
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