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Synthetic Image Generator/xml2struct.m

+function [ s ] = xml2struct( file )
+%Convert xml file into a MATLAB structure
+% [ s ] = xml2struct( file )
+%
+% A file containing:
+% <XMLname attrib1="Some value">
+%   <Element>Some text</Element>
+%   <DifferentElement attrib2="2">Some more text</Element>
+%   <DifferentElement attrib3="2" attrib4="1">Even more text</DifferentElement>
+% </XMLname>
+%
+% Will produce:
+% s.XMLname.Attributes.attrib1 = "Some value";
+% s.XMLname.Element.Text = "Some text";
+% s.XMLname.DifferentElement{1}.Attributes.attrib2 = "2";
+% s.XMLname.DifferentElement{1}.Text = "Some more text";
+% s.XMLname.DifferentElement{2}.Attributes.attrib3 = "2";
+% s.XMLname.DifferentElement{2}.Attributes.attrib4 = "1";
+% s.XMLname.DifferentElement{2}.Text = "Even more text";
+%
+% Please note that the following characters are substituted
+% '-' by '_dash_', ':' by '_colon_' and '.' by '_dot_'
+%
+% Written by W. Falkena, ASTI, TUDelft, 21-08-2010
+% Attribute parsing speed increased by 40% by A. Wanner, 14-6-2011
+% Added CDATA support by I. Smirnov, 20-3-2012
+%
+% Modified by X. Mo, University of Wisconsin, 12-5-2012
+
+    if (nargin < 1)
+        clc;
+        help xml2struct
+        return
+    end
+    
+    if isa(file, 'org.apache.xerces.dom.DeferredDocumentImpl') || isa(file, 'org.apache.xerces.dom.DeferredElementImpl')
+        % input is a java xml object
+        xDoc = file;
+    else
+        %check for existance
+        if (exist(file,'file') == 0)
+            %Perhaps the xml extension was omitted from the file name. Add the
+            %extension and try again.
+            if (isempty(strfind(file,'.xml')))
+                file = [file '.xml'];
+            end
+            
+            if (exist(file,'file') == 0)
+                error(['The file ' file ' could not be found']);
+            end
+        end
+        %read the xml file
+        xDoc = xmlread(file);
+    end
+    
+    %parse xDoc into a MATLAB structure
+    s = parseChildNodes(xDoc);
+    
+end
+
+% ----- Subfunction parseChildNodes -----
+function [children,ptext,textflag] = parseChildNodes(theNode)
+    % Recurse over node children.
+    children = struct;
+    ptext = struct; textflag = 'Text';
+    if hasChildNodes(theNode)
+        childNodes = getChildNodes(theNode);
+        numChildNodes = getLength(childNodes);
+
+        for count = 1:numChildNodes
+            theChild = item(childNodes,count-1);
+            [text,name,attr,childs,textflag] = getNodeData(theChild);
+            
+            if (~strcmp(name,'#text') && ~strcmp(name,'#comment') && ~strcmp(name,'#cdata_dash_section'))
+                %XML allows the same elements to be defined multiple times,
+                %put each in a different cell
+                if (isfield(children,name))
+                    if (~iscell(children.(name)))
+                        %put existsing element into cell format
+                        children.(name) = {children.(name)};
+                    end
+                    index = length(children.(name))+1;
+                    %add new element
+                    children.(name){index} = childs;
+                    if(~isempty(fieldnames(text)))
+                        children.(name){index} = text; 
+                    end
+                    if(~isempty(attr)) 
+                        children.(name){index}.('Attributes') = attr; 
+                    end
+                else
+                    %add previously unknown (new) element to the structure
+                    children.(name) = childs;
+                    if(~isempty(text) && ~isempty(fieldnames(text)))
+                        children.(name) = text; 
+                    end
+                    if(~isempty(attr)) 
+                        children.(name).('Attributes') = attr; 
+                    end
+                end
+            else
+                ptextflag = 'Text';
+                if (strcmp(name, '#cdata_dash_section'))
+                    ptextflag = 'CDATA';
+                elseif (strcmp(name, '#comment'))
+                    ptextflag = 'Comment';
+                end
+                
+                %this is the text in an element (i.e., the parentNode) 
+                if (~isempty(regexprep(text.(textflag),'[\s]*','')))
+                    if (~isfield(ptext,ptextflag) || isempty(ptext.(ptextflag)))
+                        ptext.(ptextflag) = text.(textflag);
+                    else
+                        %what to do when element data is as follows:
+                        %<element>Text <!--Comment--> More text</element>
+                        
+                        %put the text in different cells:
+                        % if (~iscell(ptext)) ptext = {ptext}; end
+                        % ptext{length(ptext)+1} = text;
+                        
+                        %just append the text
+                        ptext.(ptextflag) = [ptext.(ptextflag) text.(textflag)];
+                    end
+                end
+            end
+            
+        end
+    end
+end
+
+% ----- Subfunction getNodeData -----
+function [text,name,attr,childs,textflag] = getNodeData(theNode)
+    % Create structure of node info.
+    
+    %make sure name is allowed as structure name
+    name = toCharArray(getNodeName(theNode))';
+    name = strrep(name, '-', '_dash_');
+    name = strrep(name, ':', '_colon_');
+    name = strrep(name, '.', '_dot_');
+
+    attr = parseAttributes(theNode);
+    if (isempty(fieldnames(attr))) 
+        attr = []; 
+    end
+    
+    %parse child nodes
+    [childs,text,textflag] = parseChildNodes(theNode);
+    
+    if (isempty(fieldnames(childs)) && isempty(fieldnames(text)))
+        %get the data of any childless nodes
+        % faster than if any(strcmp(methods(theNode), 'getData'))
+        % no need to try-catch (?)
+        % faster than text = char(getData(theNode));
+        text.(textflag) = toCharArray(getTextContent(theNode))';
+    end
+    
+end
+
+% ----- Subfunction parseAttributes -----
+function attributes = parseAttributes(theNode)
+    % Create attributes structure.
+
+    attributes = struct;
+    if hasAttributes(theNode)
+       theAttributes = getAttributes(theNode);
+       numAttributes = getLength(theAttributes);
+
+       for count = 1:numAttributes
+            %attrib = item(theAttributes,count-1);
+            %attr_name = regexprep(char(getName(attrib)),'[-:.]','_');
+            %attributes.(attr_name) = char(getValue(attrib));
+
+            %Suggestion of Adrian Wanner
+            str = toCharArray(toString(item(theAttributes,count-1)))';
+            k = strfind(str,'='); 
+            attr_name = str(1:(k(1)-1));
+            attr_name = strrep(attr_name, '-', '_dash_');
+            attr_name = strrep(attr_name, ':', '_colon_');
+            attr_name = strrep(attr_name, '.', '_dot_');
+            attributes.(attr_name) = str((k(1)+2):(end-1));
+       end
+    end
+end
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