Merge pull request #501 from robertoffmoura/compress-m2json-output

Compress output of 'm2json'

Author: robertoffmoura

plotly/plotly_aux/m2json.m

@@ -3,49 +3,60 @@
         valstr = struct2json(val);
     elseif iscell(val)
         valstr = cell2json(val);
-    elseif isa(val, 'numeric')
+    elseif isa(val, "numeric")
         sz = size(val);
+        if isa(val,"single")
+            precision = "7";
+        else
+            precision = "15";
+        end
+        fmt = "%." + precision + "g,";
         if length(find(sz>1))>1 % 2D or higher array
-            valstr = '';
+            valstr = "";
             for i = 1:sz(1)
-                valsubstr = [sprintf('%.15g, ', val(i,:))];
-                valsubstr = valsubstr(1:(end-2));
-                valstr = [valstr ', [' valsubstr ']'];
+                valsubstr = sprintf(fmt, val(i,:));
+                valsubstr = valsubstr(1:(end-1));
+                valstr = valstr + ", [" + valsubstr + "]";
             end
             valstr = valstr(3:end); % trail leading commas
         else
-            valstr = [sprintf('%.15g, ', val)];
-            valstr = valstr(1:(end-2));
+            valstr = [sprintf(fmt, val)];
+            valstr = valstr(1:(end-1));
         end
         if length(val)>1
-            valstr = ['[' valstr ']'];
-        elseif length(val) == 0
-            valstr = '[]';
+            valstr = "[" + valstr + "]";
+        elseif isempty(val)
+            valstr = "[]";
         end
-        valstr = strrep(valstr,'-Inf', 'null');
-        valstr = strrep(valstr, 'Inf', 'null');
-        valstr = strrep(valstr, 'NaN', 'null');
+        valstr = strrep(valstr,"-Inf", "null");
+        valstr = strrep(valstr, "Inf", "null");
+        valstr = strrep(valstr, "NaN", "null");
     elseif ischar(val)
          [r, ~] = size(val);
          % We can't use checkescape() if we have ['abc'; 'xyz']
          if r > 1
              valstr = cell2json(cellstr(val));
          else
-             val = checkescape(val); %add escape characters
-             valstr = ['"' val '"'];
+             val = checkescape(val); % add escape characters
+             valstr = sprintf('"%s"', val);
          end
     elseif islogical(val)
         if val
-            valstr = 'true';
+            valstr = "true";
         else
-            valstr = 'false';
+            valstr = "false";
         end
     elseif isdatetime(val)
         valstr = m2json(convertDate(val));
     elseif isstring(val)
-        fh = ifel(isscalar(val),@char,@cellstr);
+        if isscalar(val)
+            fh = @char;
+        else
+            fh = @cellstr;
+        end
         valstr = m2json(fh(val));
     else
-        valstr = ''; % wtf is it?
-        warning("Failed to m2json encode class of type: %s",class(val));
+        valstr = "";
+        warning("Failed to m2json encode class of type: %s", class(val));
     end
+end