struct2string(var)

function structstring = struct2string(var)
%STRUCT2STRING get the sentence which the input struct variable created
%   structstring = struct2string(var) get the sentence which var created
%   the input variable var must be a struct
%
%   Example:
%     clear s, s.country = 'China'; s.city = 'Chongqing'; 
%     s.address = struct('countrty','China','city','Chongqing');
%
%     structstring = struct2string(s)
%
%   See also CELL2STRING.

%   Copyright 2012-2020 Xibiao Studio
%   Author: Xiaobiao Huang
%   $Revision: 1.0.0.0 Date: $ 2012-09-27 20:22 $

if ~isstruct(var)
    disp('Error: the intput variable is not a struct')
    return;
end
f = fieldnames(var);
v = struct2cell(var);
structstring = [];
for i=1:length(f)
    structstring = handlestruct(structstring,f{i,1},v{i,1},length(f),i);
    if i ~= length(f)
        structstring = [ structstring ','];
    end        
end

function [structstring] = handlestruct(structstring,sField,sValue,sLength,sPointer)
if ~isstruct(sValue)
    if sPointer == 1
        structstring = [structstring 'struct('];
    end
    if strcmp(class(sValue),'double')
        structstring = [structstring '''' sField ''',' num2str(sValue) ];
    elseif isempty(sValue)
        structstring = [structstring '''' sField ''','''''];
    else
        structstring = [structstring '''' sField ''',''' sValue '''' ];
    end
elseif isstruct(sValue)
    if sPointer == 1
        structstring = [structstring 'struct(''' sField ''','];
    else
        structstring = [structstring '''' sField   ''','];
    end
    f = fieldnames(sValue);
    v = struct2cell(sValue);
    for i=1:length(f)
        structstring = handlestruct(structstring,f{i,1},v{i,1},length(f),i);
        if i ~= length(f)
            structstring = [ structstring ','];
        end
    end
end
if sPointer == sLength
    structstring = [ structstring ')' ];
end