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2026-09-17 23:59:11 +09:00 · 2026-08-07 15:56:42 +09:00
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+function J=mat2json(M,F)
+import io.*
+%JSON2MAT converts a Matlab structure into a javscript data object (JSON).
+%         M can also be a file name. In teh spirit of fast prototyping 
+%         this function takes a very loose approach to data types and 
+%         dimensionality - neither is explicitly retained.
+%
+%         The second input argument is optional and when used it indicates
+%         the name of teh file where J is to be stored.
+%
+%Example: mat2json(json2mat('{lala:2,lele:4,lili:[1,2,{bubu:5}]}')) 
+%
+% Jonas Almeida, March 2010
+
+% Copyright (c) 2010, Jonas Almeida
+% All rights reserved.
+% 
+% Redistribution and use in source and binary forms, with or without
+% modification, are permitted provided that the following conditions are
+% met:
+% 
+% * Redistributions of source code must retain the above copyright
+% notice, this list of conditions and the following disclaimer.
+% * Redistributions in binary form must reproduce the above copyright
+% notice, this list of conditions and the following disclaimer in
+% the documentation and/or other materials provided with the distribution
+% 
+% THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+% AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+% IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+% ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+% LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+% CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+% SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+% INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+% CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+% ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+% POSSIBILITY OF SUCH DAMAGE.
+
+
+switch class(M)
+    case 'struct'
+        J='{';
+        f=fieldnames(M);
+        for i=1:length(f)
+            fld=f{i};
+            id=regexp(fld,'^id(\d*)$','tokens');
+            if ~isempty(id)
+              fld=id{1}{1};
+            end
+            J=[J,'"',fld,'":',mat2json(M.(f{i})),','];
+        end
+        J(end)='}';
+        
+    case 'cell'
+        J='[';
+        for i=1:length(M)
+            J=[J,mat2json(M{i}),','];
+        end
+        J(end)=']';
+    otherwise
+        if isnumeric(M) % notice looseness in not converting single numbers into arrays
+            if length(M(:))==1
+                J=num2str(M);
+            else
+                s=size(M);
+                if (length(s)==2)&(s(1)<2) % horizontal or null vector
+                    J=['[',num2str(M),']']; % and of destroying dimensionality
+                    J=regexprep(J,'\s+',',');
+                elseif length(s)==2 %2D solution
+                    J='[';
+                    for i=1:s(1)
+                        J=[J,mat2json(M(i,:)),','];
+                    end
+                    J(end)=']';
+                elseif length(s)>2 % for now treat higher dimensions as linear vectors
+                    J=['[',num2str(M(:)'),']']; % and of destroying dimensionality
+                    J=regexprep(J,'\s+',',');
+                end
+            end
+        else
+            J=['"',M,'"']; % otherwise it is treated as a string
+        end
+end
+
+if nargin>1 %save JSON result in file
+    fid=fopen(F,'w');
+    fprintf(fid,'%s',J);
+    fclose(fid);
+end