Check max output size before displaying

Author: duy

modules/symja-evaluator/src/main/java/com/symja/evaluator/OutputForm.java

@@ -1,19 +1,28 @@
 package com.symja.evaluator;
 
+import org.matheclipse.core.basic.Config;
 import org.matheclipse.core.form.output.OutputFormFactory;
 import org.matheclipse.core.form.tex.TeXFormFactory;
 import org.matheclipse.core.interfaces.IExpr;
+import org.matheclipse.parser.client.ParserConfig;
 
 public class OutputForm {
+
     public static String toString(IExpr result) {
         if (result == null) {
             return "";
         }
         try {
-            OutputFormFactory outputFormFactory = OutputFormFactory.get(true, false);
-            return outputFormFactory.toString(result);
+            OutputFormFactory outputFormFactory = OutputFormFactory.get(ParserConfig.PARSER_USE_LOWERCASE_SYMBOLS, false);
+            String string = outputFormFactory.toString(result);
+
+            if (string.length() > Config.MAX_OUTPUT_SIZE) {
+                return "Max output size " + Config.MAX_OUTPUT_SIZE + " characters exceeded";
+            }
+
+            return string;
         } catch (Exception e) {
-            return "Error";
+            return "Error: " + e.getMessage();
         }
     }
 
@@ -27,9 +36,14 @@ public static String toLatex(IExpr expr) {
             if (teXFormFactory.convert(buffer, expr)) {
                 return buffer.toString();
             }
+
+            if (buffer.length() > Config.MAX_OUTPUT_SIZE) {
+                return "Max output size " + Config.MAX_OUTPUT_SIZE + " characters exceeded";
+            }
+
             return "Error";
         } catch (Exception e) {
-            return "Error";
+            return "Error: " + e.getMessage();
         }
     }
 }