Parsing Text File with Matlab

Hello !

I'm new with matlab and i'm trying to parse a text file with Matlab which contains my own markup language.

[Date]
2019-03-27 10:45:10.167618
[Component]
  Component_Name : Manager principal
  Component_ID : _ocl_MEu9Eemg_bhrv2HEbw
  {Port}
    Port_Name : FOP 1
    Port_ID : _sZMXoEu9Eemg_bhrv2HEbw
    Port_Type : Outgoing Port

[Component]
  Component_Name : Manager 2
  Component_ID : _r-HlMEu9Eemg_bhrv2HEbw
  {Port}
    Port_Name : FIP 1
    Port_ID : _sZWIoku9Eemg_bhrv2HEbw
    Port_Type : Incoming Port

[Link]
  Link_Name : On/Off

  Link_Source_Name : Manager principal
  Link_Source_ID : _ocl_MEu9Eemg_bhrv2HEbw
  Link_Source_Port_Name : FOP 1
  Link_Source_Port_ID : _sZMXoEu9Eemg_bhrv2HEbw

  Link_Target_Name : Manager 2
  Link_Target_ID : _r-HlMEu9Eemg_bhrv2HEbw
  Link_Target_Port_Name : FIP 1
  Link_Target_Port_ID : _sZWIoku9Eemg_bhrv2HEbw
  

I already make this code :

  function testLectureXML()

    componentBalise = '[Component]';
    componentNameBalise = 'Component_Name : ';
    componentIdBalise = 'Component_ID : ';
    
    PortBalise = '{Port}';
    PortNameBalise = 'Port_Name : ';
    PortIdBalise = 'Port_ID : ';
    PortTypeBalise = 'Port_Type : ';
    
    
    linkBalise = '[Link]';
    linkNameBalise = 'Link_Name : ';
    
    str_buf = fileread( 'capella_to_matlab.txt' );
    component_list = strfind(str_buf, componentBalise);
    link_list = strfind(str_buf, linkBalise);
    n_link = numel(link_list);
    n_component = numel( component_list );
    
    for ii = 1 : n_component
        ix1 = component_list(ii)+ length(componentBalise) + 2; %+2 pour retirer le retour chariot
        if ii == n_component
            buf = str_buf( ix1 : end );
        else
            buf = str_buf( ix1 : component_list(ii+1)-1 ); % Contenus de chaque balise [Composant]
        end
        
        component_NameStart = strfind(buf, componentNameBalise) + length(componentNameBalise); % Chaque élément dans le fichier txt de type "Component_name : "
        component_IDStart = strfind(buf, componentIdBalise) + length(componentIdBalise);
        carrierReturn = strfind(buf, char(13)); % Postion de chaque retour à la ligne
        component_NameValue = buf(component_NameStart : carrierReturn - 1); % On récupère la valeur des "Component_Name : "
        component_IDValue = buf(component_IDStart : carrierReturn - 1);
        while contains(component_NameValue, ' ')
            component_NameValue = strrep(component_NameValue, ' ', '_'); % On ajoute un _ à la place des espaces dans les noms des composants 
        end
        new_system(component_NameValue);

And i don't understand why i success to get component_NameValue which is Manager principal but not its ID with component_IDValue which returns me "empty 1x0 char"

Thanks for help !

Answer 1

[Jan]

Are you sure you want to use char(13) as linebreak? While the DOS line breaks char([10,13]) are used e.g. by the old version of Microsoft's NotePad, all other modern editors are happy with char(10). I assume this might be the problem here.

This loop is meaningless

while contains(component_NameValue, ' ')
   component_NameValue = strrep(component_NameValue, ' ', '_'); % On ajoute un _ à la place des espaces dans les noms des composants 
end

Simply omit the loop, because the first strrep command removes all spaces.

[Lucas S]

Thanks for your answer ! For the loop i just delete the loop and indeed it's working anyway and for the char(13) and char(10) i found my problem. I have understood after i post this question that carrierReturn is an array with the position of each carrier Return so i just used :

component_IDValue = buf(component_IDStart : carrierReturn(2);