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function varargout = add(tree,uid,type,parameter)
% XMLTREE/ADD Method (add childs to elements of an XML Tree)
% FORMAT vararout = add(tree,uid,type,parameter)
%
% tree - XMLTree object
% uid - array of uid's
% type - 'element', 'chardata', 'cdata', 'pi' or 'comment'
% parameter - property name (a character array unless type='pi' for
% which parameter=struct('target','','value',''))
%
% new_uid - UID's of the newly created nodes
%
% tree = add(tree,uid,type,parameter);
% [tree, new_uid] = add(tree,uid,type,parameter);
%__________________________________________________________________________
%
% Add a node (element, chardata, cdata, pi or comment) in the XML Tree.
% It adds a child to the element whose UID is iud.
% Use attributes({'set','get','add','del','length'},...) function to
% deal with the attributes of an element node (initialized empty).
% The tree parameter must be in input AND in output.
%__________________________________________________________________________
% Copyright (C) 2002-2011 http://www.artefact.tk/
% Guillaume Flandin
% $Id: add.m 4460 2011-09-05 14:52:16Z guillaume $
if ~isa(uid,'double')
error('[XMLTree] UID must be a double array.');
end
if ~ischar(type)
error('[XMLTree] TYPE must be a valid item type.');
end
if strcmp(type,'pi')
if ~isfield(parameter,'target') || ~isfield(parameter,'value') || ...
~ischar(parameter.target) || ~ischar(parameter.value)
error(['[XMLTree] For a Processing Instruction, ',...
'PARAMETER must be a struct.']);
end
elseif ~ischar(parameter)
error('[XMLTree] PARAMETER must be a string.');
end
if nargout == 2
l = length(tree.tree);
varargout{2} = (l+1):(l+numel(uid));
end
for i=1:numel(uid)
if uid(i)<1 || uid(i)>length(tree.tree)
error('[XMLTree] Invalid UID.');
end
if ~strcmp(tree.tree{uid(i)}.type,'element')
error('[XMLTree] Cannot add a child to a non-element node.');
end
l = length(tree.tree);
switch type
case 'element'
tree.tree{l+1} = struct('type','element',...
'name',parameter,...
'attributes',[],...
'contents',[],...
'parent',[],...
'uid',l+1);
case 'chardata'
tree.tree{l+1} = struct('type','chardata',...
'value',parameter,...
'parent',[],...
'uid',l+1);
case 'cdata'
tree.tree{l+1} = struct('type','cdata',...
'value',parameter,...
'parent',[],...
'uid',l+1);
case 'pi'
tree.tree{l+1} = struct('type','pi',...
'target',parameter.target,...
'value',parameter.value,...
'parent',[],...
'uid',l+1);
case 'comment'
tree.tree{l+1} = struct('type','comment',...
'value',parameter,...
'parent',[],...
'uid',l+1);
otherwise
error(sprintf('[XMLTree] %s: unknown item type.',type));
end
tree.tree{uid(i)}.contents = [tree.tree{uid(i)}.contents l+1];
tree.tree{l+1}.parent = uid(i);
end
varargout{1} = tree;
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