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Diffstat (limited to 'third_party/lisp/s-xml/src/xml-struct-dom.lisp')
| -rw-r--r-- | third_party/lisp/s-xml/src/xml-struct-dom.lisp | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/third_party/lisp/s-xml/src/xml-struct-dom.lisp b/third_party/lisp/s-xml/src/xml-struct-dom.lisp new file mode 100644 index 0000000000..7037388915 --- /dev/null +++ b/third_party/lisp/s-xml/src/xml-struct-dom.lisp @@ -0,0 +1,125 @@ +;;;; -*- mode: lisp -*- +;;;; +;;;; $Id: xml-struct-dom.lisp,v 1.2 2005/08/29 15:01:47 scaekenberghe Exp $ +;;;; +;;;; XML-STRUCT implementation of the generic DOM parser and printer. +;;;; +;;;; Copyright (C) 2002, 2004 Sven Van Caekenberghe, Beta Nine BVBA. +;;;; +;;;; You are granted the rights to distribute and use this software +;;;; as governed by the terms of the Lisp Lesser General Public License +;;;; (http://opensource.franz.com/preamble.html), also known as the LLGPL. + +(in-package :s-xml) + +;;; xml-element struct datastructure and API + +(defstruct xml-element + name ; :tag-name + attributes ; a assoc list of (:attribute-name . "attribute-value") + children ; a list of children/content either text strings or xml-elements + ) + +(setf (documentation 'xml-element-p 'function) + "Return T when the argument is an xml-element struct" + (documentation 'xml-element-attributes 'function) + "Return the alist of attribute names and values dotted pairs from an xml-element struct" + (documentation 'xml-element-children 'function) + "Return the list of children from an xml-element struct" + (documentation 'xml-element-name 'function) + "Return the name from an xml-element struct" + (documentation 'make-xml-element 'function) + "Make and return a new xml-element struct") + +(defun xml-element-attribute (xml-element key) + "Return the string value of the attribute with name the keyword :key + of xml-element if any, return null if not found" + (let ((pair (assoc key (xml-element-attributes xml-element) :test #'eq))) + (when pair (cdr pair)))) + +(defun (setf xml-element-attribute) (value xml-element key) + "Set the string value of the attribute with name the keyword :key of + xml-element, creating a new attribute if necessary or overwriting an + existing one, returning the value" + (let ((attributes (xml-element-attributes xml-element))) + (if (null attributes) + (push (cons key value) (xml-element-attributes xml-element)) + (let ((pair (assoc key attributes :test #'eq))) + (if pair + (setf (cdr pair) value) + (push (cons key value) (xml-element-attributes xml-element))))) + value)) + +(defun new-xml-element (name &rest children) + "Make a new xml-element with name and children" + (make-xml-element :name name :children children)) + +(defun first-xml-element-child (xml-element) + "Get the first child of an xml-element" + (first (xml-element-children xml-element))) + +(defun xml-equal (xml-1 xml-2) + (and (xml-element-p xml-1) + (xml-element-p xml-2) + (eq (xml-element-name xml-1) + (xml-element-name xml-2)) + (equal (xml-element-attributes xml-1) + (xml-element-attributes xml-2)) + (reduce #'(lambda (&optional (x t) (y t)) (and x y)) + (mapcar #'(lambda (x y) + (or (and (stringp x) (stringp y) (string= x y)) + (xml-equal x y))) + (xml-element-children xml-1) + (xml-element-children xml-2))))) + +;;; printing xml structures + +(defmethod print-xml-dom (xml-element (input-type (eql :xml-struct)) stream pretty level) + (declare (special *namespaces*)) + (let ((*namespaces* (extend-namespaces (xml-element-attributes xml-element) + *namespaces*))) + (write-char #\< stream) + (print-identifier (xml-element-name xml-element) stream) + (loop :for (name . value) :in (xml-element-attributes xml-element) + :do (print-attribute name value stream)) + (let ((children (xml-element-children xml-element))) + (if children + (progn + (write-char #\> stream) + (if (and (= (length children) 1) (stringp (first children))) + (print-string-xml (first children) stream) + (progn + (dolist (child children) + (when pretty (print-spaces (* 2 level) stream)) + (if (stringp child) + (print-string-xml child stream) + (print-xml-dom child input-type stream pretty (1+ level)))) + (when pretty (print-spaces (* 2 (1- level)) stream)))) + (print-closing-tag (xml-element-name xml-element) stream)) + (write-string "/>" stream))))) + +;;; the standard hooks to generate xml-element structs + +(defun standard-new-element-hook (name attributes seed) + (declare (ignore name attributes seed)) + '()) + +(defun standard-finish-element-hook (name attributes parent-seed seed) + (let ((xml-element (make-xml-element :name name + :attributes attributes + :children (nreverse seed)))) + (cons xml-element parent-seed))) + +(defun standard-text-hook (string seed) + (cons string seed)) + +;;; top level standard parser interfaces + +(defmethod parse-xml-dom (stream (output-type (eql :xml-struct))) + (car (start-parse-xml stream + (make-instance 'xml-parser-state + :new-element-hook #'standard-new-element-hook + :finish-element-hook #'standard-finish-element-hook + :text-hook #'standard-text-hook)))) + +;;;; eof |