FCL compiler - JavaScript

html/about.html

@@ -113,6 +113,7 @@
   <tr> <td valign=top> Helano P&oacute;voas de Lima </td> <td>  DefuzzifierContinuous graphic bug. </td> </tr>
   <tr> <td valign=top> Nikola Nikolovski </td> <td> RuleBlock name bug.</td> </tr>
   <tr> <td valign=top> Ivan De Falco </td> <td> "AND Bounded Diff" bug. </td> </tr>
+  <tr> <td valign=top> Marcin Szczepanski </td> <td> FCL Compiler (JavaScript). </td> </tr>
 </table>
 				
 				</p>

html/fcl/tipper.cpp

@@ -1,7 +1,7 @@
 //--------------------------------------------------------------------------------
 // Code generated by jFuzzyLogic
-// jFuzzyLogic Version : JFuzzyLogic 3.2g (build 2013-10-20), by Pablo Cingolani 
-// jFuzzyLogic creted by Pablo Cingolani
+// jFuzzyLogic Version : JFuzzyLogic 4.0 (build 2022-05-12), by Pablo Cingolani
+// jFuzzyLogic created by Pablo Cingolani
 //--------------------------------------------------------------------------------
 
 

html/fcl/tipper.js

@@ -0,0 +1,208 @@
+//--------------------------------------------------------------------------------
+// Code generated by jFuzzyLogic
+// jFuzzyLogic Version : JFuzzyLogic 4.0 (build 2022-05-12), by Pablo Cingolani
+// jFuzzyLogic created by Pablo Cingolani
+//--------------------------------------------------------------------------------
+
+function ruleAccumulationMethod_max(defuzzifierValue, valueToAggregate) {
+	return (defuzzifierValue > valueToAggregate ? defuzzifierValue : valueToAggregate);
+}
+
+function ruleActivationMethod_min(degreeOfSupport, membership) {
+	return (degreeOfSupport < membership ? degreeOfSupport : membership);
+}
+
+function ruleConnectionMethod_and(antecedent1, antecedent2) {
+	return (antecedent1 < antecedent2 ? antecedent1 : antecedent2);
+}
+
+function ruleConnectionMethod_or(antecedent1, antecedent2) {
+	return (antecedent1 > antecedent2 ? antecedent1 : antecedent2);
+}
+
+class FunctionBlock_tipper {
+
+	// VAR_INPUT
+	food;
+	service;
+
+	// VAR_OUTPUT
+	tip;
+
+	// FUZZIFY food
+	food_delicious;
+	food_rancid;
+
+	// FUZZIFY service
+	service_excellent;
+	service_good;
+	service_poor;
+
+	// DEFUZZIFY tip
+	defuzzify_tip;
+
+	// Constructor
+	constructor() {
+		this.tip = 0.0;
+		this.defuzzify_tip = new Array(1000);
+	}
+
+	// Calculate function block
+	calc() {
+		this.reset();
+		this.fuzzify();
+		this.calc_No1();
+		this.defuzzify();
+	}
+
+	// RULEBLOCK No1
+	calc_No1() {
+		// RULE 1 : IF (service IS poor) OR (food IS rancid) THEN tip IS cheap;
+		let degreeOfSupport_1 = 1.0 * (ruleConnectionMethod_or(this.service_poor, this.food_rancid));
+		if (degreeOfSupport_1 > 0) {
+			for (let i = 0; i < 1000; i++) {
+				let x = 0.0 + i * 0.03;
+				let membership = this.membership_tip_cheap(x);
+				let y = ruleActivationMethod_min(degreeOfSupport_1 , membership);
+				this.defuzzify_tip[i] = ruleAccumulationMethod_max(this.defuzzify_tip[i], y);
+			}
+		}
+
+		// RULE 2 : IF service IS good THEN tip IS average;
+		let degreeOfSupport_2 = 1.0 * (this.service_good);
+		if (degreeOfSupport_2 > 0) {
+			for (let i = 0; i < 1000; i++) {
+				let x = 0.0 + i * 0.03;
+				let membership = this.membership_tip_average(x);
+				let y = ruleActivationMethod_min(degreeOfSupport_2 , membership);
+				this.defuzzify_tip[i] = ruleAccumulationMethod_max(this.defuzzify_tip[i], y);
+			}
+		}
+
+		// RULE 3 : IF (service IS excellent) AND (food IS delicious) THEN tip IS generous;
+		let degreeOfSupport_3 = 1.0 * (ruleConnectionMethod_and(this.service_excellent, this.food_delicious));
+		if (degreeOfSupport_3 > 0) {
+			for (let i = 0; i < 1000; i++) {
+				let x = 0.0 + i * 0.03;
+				let membership = this.membership_tip_generous(x);
+				let y = ruleActivationMethod_min(degreeOfSupport_3 , membership);
+				this.defuzzify_tip[i] = ruleAccumulationMethod_max(this.defuzzify_tip[i], y);
+			}
+		}
+
+	}
+
+	// Defuzzify 
+	defuzzify() {
+		let sum_tip = 0.0;
+		let wsum_tip = 0.0;
+		let x;
+		for (let i = 0; i < 1000; i++) {
+			x = 0.0 + i * 0.03;
+			sum_tip += this.defuzzify_tip[i];
+			wsum_tip += x * this.defuzzify_tip[i];
+		}
+		this.tip = wsum_tip / sum_tip;
+	}
+
+	// Fuzzify all variables
+	fuzzify() {
+		this.food_delicious = this.membership_food_delicious(this.food);
+		this.food_rancid = this.membership_food_rancid(this.food);
+		this.service_excellent = this.membership_service_excellent(this.service);
+		this.service_good = this.membership_service_good(this.service);
+		this.service_poor = this.membership_service_poor(this.service);
+	}
+
+	// Membership functions 
+	membership_food_delicious(x) {
+		if (x <= 7.0)		return 0.0;
+		if (x > 9.0)		return 1.0;
+		if (x <= 9.0)		return 0.0 + (1.0 - 0.0) * ((x - 7.0) / (9.0 - 7.0));
+	}
+
+	membership_food_rancid(x) {
+		if (x <= 0.0)		return 1.0;
+		if (x > 3.0)		return 0.0;
+		if (x <= 1.0)		return 1.0 + (1.0 - 1.0) * ((x - 0.0) / (1.0 - 0.0));
+		if (x <= 3.0)		return 1.0 + (0.0 - 1.0) * ((x - 1.0) / (3.0 - 1.0));
+	}
+
+	membership_service_excellent(x) {
+		if (x <= 6.0)		return 0.0;
+		if (x > 9.0)		return 1.0;
+		if (x <= 9.0)		return 0.0 + (1.0 - 0.0) * ((x - 6.0) / (9.0 - 6.0));
+	}
+
+	membership_service_good(x) {
+		if (x <= 1.0)		return 0.0;
+		if (x > 9.0)		return 0.0;
+		if (x <= 4.0)		return 0.0 + (1.0 - 0.0) * ((x - 1.0) / (4.0 - 1.0));
+		if (x <= 6.0)		return 1.0 + (1.0 - 1.0) * ((x - 4.0) / (6.0 - 4.0));
+		if (x <= 9.0)		return 1.0 + (0.0 - 1.0) * ((x - 6.0) / (9.0 - 6.0));
+	}
+
+	membership_service_poor(x) {
+		if (x <= 0.0)		return 1.0;
+		if (x > 4.0)		return 0.0;
+		if (x <= 4.0)		return 1.0 + (0.0 - 1.0) * ((x - 0.0) / (4.0 - 0.0));
+	}
+
+	membership_tip_average(x) {
+		if (x <= 10.0)		return 0.0;
+		if (x > 20.0)		return 0.0;
+		if (x <= 15.0)		return 0.0 + (1.0 - 0.0) * ((x - 10.0) / (15.0 - 10.0));
+		if (x <= 20.0)		return 1.0 + (0.0 - 1.0) * ((x - 15.0) / (20.0 - 15.0));
+	}
+
+	membership_tip_cheap(x) {
+		if (x <= 0.0)		return 0.0;
+		if (x > 10.0)		return 0.0;
+		if (x <= 5.0)		return 0.0 + (1.0 - 0.0) * ((x - 0.0) / (5.0 - 0.0));
+		if (x <= 10.0)		return 1.0 + (0.0 - 1.0) * ((x - 5.0) / (10.0 - 5.0));
+	}
+
+	membership_tip_generous(x) {
+		if (x <= 20.0)		return 0.0;
+		if (x > 30.0)		return 0.0;
+		if (x <= 25.0)		return 0.0 + (1.0 - 0.0) * ((x - 20.0) / (25.0 - 20.0));
+		if (x <= 30.0)		return 1.0 + (0.0 - 1.0) * ((x - 25.0) / (30.0 - 25.0));
+	}
+
+
+	// Print 
+	print() {
+		console.log("Function block tipper:\n");
+		console.log("	Input  %s: %f\n", "food" , this.food);
+		console.log("	       %s: %f\n", "food_delicious" , this.food_delicious);
+		console.log("	       %s: %f\n", "food_rancid" , this.food_rancid);
+		console.log("	Input  %s: %f\n", "service" , this.service);
+		console.log("	       %s: %f\n", "service_excellent" , this.service_excellent);
+		console.log("	       %s: %f\n", "service_good" , this.service_good);
+		console.log("	       %s: %f\n", "service_poor" , this.service_poor);
+		console.log("	Output %s: %f\n", "tip" , this.tip);
+	}
+
+	// Reset output
+	reset() {
+		for (let i = 0 ; i < 1000; i++) {
+			this.defuzzify_tip[i] = 0.0;
+		}
+	}
+
+};
+
+function main(food, service) {
+	// Create function blocks
+	const tipper = new FunctionBlock_tipper();
+
+	// Parse input
+	tipper.food = food;
+	tipper.service = service;
+
+	// Calculate
+	tipper.calc();
+
+	// Show results
+	tipper.print();
+}

html/index.html

@@ -180,6 +180,7 @@
           <p class="lead">Tons of advanced features 
 			<ul>
 				<li> C++ compiler (convert FCL to C++)
+        <li> JavaScript compiler (convert FCL to JavaScript)
 				<li> Core library available for Android developers <img src="images/android.png">
 				<li> Parameter optimization
 				<li> Parametric membership functions

html/manual.html

@@ -86,6 +86,7 @@
           <a class="list-group-item" href="#using">Using jFuzzyLogic in projects</a>
           <a class="list-group-item" href="#plugin">Eclipse plug-in</a>
           <a class="list-group-item" href="#compiler">FCL compiler</a>
+          <a class="list-group-item" href="#compilerJS">FCL compiler (JavaScript)</a>
           <a class="list-group-item" href="#optim">Parameter optimization</a>
         </ul>
       </div>
@@ -956,11 +957,32 @@ java -jar jFuzzyLogic.jar -c tipper.fcl > tipper.cpp
         </p>
         </section>
 
+        <section id="compilerJS">
+          <div class="page-header">
+            <h1>10. FCL compiler (JavaScript)</h1>
+          </div>
+        <p class="lead">
+        jFuzzyLogic can compile FCL into JavaScript code.
+        </p>
+        <p>
+        A built in compiler allows to compiler FCL code into JavaScript.
+        For instance, by simply running the following command, we can create a JavaScript program that has the same functionality as the FCL program:
+<pre>
+java -jar jFuzzyLogic.jar -j tipper.fcl > tipper.js
+</pre>
+
+        The previous command creates <a href="fcl/tipper.js">this JavaScript code</a>.
+        <br>
+        <br>
+        <img src="images/js.png">
+        </p>
+        </section>
+
         <!-- Parameter optimization
         ================================================== -->
         <section id="optim">
           <div class="page-header">
-            <h1>10. Parameter optimization</h1>
+            <h1>11. Parameter optimization</h1>
           </div>
 				<p class="lead">
         jFuzzyLogic provides a parameter optimization framework, allowing to learn or refine fuzzy parameters using machine learning algorithms.

src/main/java/net/sourceforge/jFuzzyLogic/CompileJS.java

@@ -0,0 +1,11 @@
+package net.sourceforge.jFuzzyLogic;
+
+/**
+ * Create JS code
+ * 
+ * @author marcin-szczepanski
+ */
+public interface CompileJS {
+
+	public String toStringJS();
+}

src/main/java/net/sourceforge/jFuzzyLogic/FIS.java

@@ -257,7 +257,7 @@ public class FIS extends FclObject implements Iterable<FunctionBlock>, CompileCp
 		out.append("//--------------------------------------------------------------------------------\n");
 		out.append("// Code generated by jFuzzyLogic\n");
 		out.append("// jFuzzyLogic Version : " + JFuzzyLogic.VERSION + " \n");
-		out.append("// jFuzzyLogic creted by Pablo Cingolani\n");
+		out.append("// jFuzzyLogic created by Pablo Cingolani\n");
 		out.append("//--------------------------------------------------------------------------------\n\n");
 		out.append("\n#include <stdio.h>\n");
 		out.append("\n#include <stdlib.h>\n");
@@ -337,6 +337,117 @@ public class FIS extends FclObject implements Iterable<FunctionBlock>, CompileCp
 		return out.toString();
 	}
 
+	/**
+	 * Create a JS code for this FIS
+	 * @return
+	 */
+	@Override
+	public String toStringJS() {
+		StringBuffer out = new StringBuffer();
+
+		out.append("//--------------------------------------------------------------------------------\n");
+		out.append("// Code generated by jFuzzyLogic\n");
+		out.append("// jFuzzyLogic Version : " + JFuzzyLogic.VERSION + " \n");
+		out.append("// jFuzzyLogic created by Pablo Cingolani\n");
+		out.append("//--------------------------------------------------------------------------------\n\n");
+
+		// Sort function blocks by name
+		ArrayList<String> fbNames = new ArrayList<String>(functionBlocks.keySet());
+		Collections.sort(fbNames);
+
+		// Ge all activations and accumulation methods
+		HashSet<RuleAccumulationMethod> raccs = new HashSet<RuleAccumulationMethod>();
+		HashSet<RuleActivationMethod> racts = new HashSet<RuleActivationMethod>();
+		HashSet<RuleConnectionMethod> rcons = new HashSet<RuleConnectionMethod>();
+		for (String name : fbNames) {
+			FunctionBlock functionBlock = getFunctionBlock(name);
+
+			for (RuleBlock rb : functionBlock.getRuleBlocks().values()) {
+				raccs.add(rb.getRuleAccumulationMethod());
+				racts.add(rb.getRuleActivationMethod());
+				for (Rule r : rb) {
+					RuleExpression rexp = r.getAntecedents();
+					rcons.addAll(rexp.getRuleConnectionMethods());
+				}
+			}
+		}
+
+		// Show code
+		for (RuleAccumulationMethod racc : raccs)
+			out.append(racc.toStringJSFunction() + "\n");
+
+		for (RuleActivationMethod ract : racts)
+			out.append(ract.toStringJSFunction() + "\n");
+
+		for (RuleConnectionMethod rcon : rcons)
+			out.append(rcon.toStringJSFunction() + "\n");
+
+		// Iterate over each function block and append it to output string
+		for (String name : fbNames) {
+			FunctionBlock functionBlock = getFunctionBlock(name);
+			out.append(functionBlock.toStringJS());
+		}
+
+		// Main method
+		out.append("function main(");
+
+		int inV = 0;
+		for (String name : fbNames) {
+			FunctionBlock functionBlock = getFunctionBlock(name);
+			for (Variable var : functionBlock.variablesSorted()) {
+				if (var.isInput()) {
+					out.append(var.getName());
+					if (inV < (functionBlock.variablesSorted().size() - 1)) {
+						out.append(", ");
+					}
+					inV++;
+				}
+			}
+		}
+
+		String outWithMainStr = out.toString();
+		if (outWithMainStr.endsWith(", ")) {
+			outWithMainStr = outWithMainStr.substring(0, outWithMainStr.length() - 2);
+			out = new StringBuffer(outWithMainStr);
+		}
+
+		out.append(") {\n");
+
+		// Create function blocks
+		out.append("\t// Create function blocks\n");
+		for (String name : fbNames)
+			out.append("\tconst " + name + " = new FunctionBlock_" + name + "();\n");
+		out.append("\n");
+
+		// Assign values
+		out.append("\t// Parse input\n");
+		int inVar = 1;
+		for (String name : fbNames) {
+			FunctionBlock functionBlock = getFunctionBlock(name);
+			for (Variable var : functionBlock.variablesSorted()) {
+				if (var.isInput()) {
+					out.append("\t" + name + "." + var.getName() + " = " + var.getName() + ";\n");
+					inVar++;
+				}
+			}
+		}
+		out.append("\n");
+
+		// Calculate
+		out.append("\t// Calculate\n");
+		for (String name : fbNames)
+			out.append("\t" + name + ".calc();\n");
+		out.append("\n");
+
+		// Show results
+		out.append("\t// Show results\n");
+		for (String name : fbNames)
+			out.append("\t" + name + ".print();\n");
+		out.append("}");
+
+		return out.toString();
+	}
+
 	@Override
 	public String toStringFcl() {
 		StringBuffer out = new StringBuffer();

src/main/java/net/sourceforge/jFuzzyLogic/FunctionBlock.java

@@ -740,6 +740,131 @@ public class FunctionBlock extends FclObject implements Iterable<RuleBlock>, Com
 				; //
 	}
 
+	@Override
+	public String toStringJS() {
+		StringBuffer calcMethod = new StringBuffer(); // Method calc()
+		StringBuffer constructor = new StringBuffer(); // Constructor
+		StringBuffer defuzzifyMethod = new StringBuffer(); // Method defuzzify()
+		StringBuffer fuzzifyMethod = new StringBuffer(); // Fuzzify method
+		StringBuffer membershipMethods = new StringBuffer(); // All membership functions
+		StringBuffer printMethod = new StringBuffer(); // Method print()
+		StringBuffer resetMethod = new StringBuffer(); // Method reset()
+		StringBuffer varDefuzzifiers = new StringBuffer(); // All defuzzifier variables
+		StringBuffer varsFuzzify = new StringBuffer(); // Fuzzify variables
+		StringBuffer varsIn = new StringBuffer(); // Input vars
+		StringBuffer varsOut = new StringBuffer(); // Output vars
+
+		varsIn.append("\t// VAR_INPUT\n");
+		varsOut.append("\t// VAR_OUTPUT\n");
+
+		// Methods
+		String className = "FunctionBlock_" + name;
+		calcMethod.append("\t// Calculate function block\n\tcalc() {\n\t\tthis.reset();\n\t\tthis.fuzzify();\n");
+		constructor.append("\t// Constructor\n\tconstructor() {\n");
+		defuzzifyMethod.append("\t// Defuzzify \n\tdefuzzify() {\n");
+		fuzzifyMethod.append("\t// Fuzzify all variables\n\tfuzzify() {\n");
+		membershipMethods.append("\t// Membership functions \n");
+		printMethod.append("\t// Print \n\tprint() {\n\t\tconsole.log(\"Function block " + name + ":\\n\");\n");
+		resetMethod.append("\t// Reset output\n\treset() {\n");
+
+		//---
+		// Show variables (sorted by name)
+		//---
+		for (Variable var : variablesSorted()) {
+			var.estimateUniverse();
+
+			if (!Double.isNaN(var.getDefaultValue())) constructor.append("\t\tthis." + var.getName() + " = " + var.getDefaultValue() + ";\n");
+
+			if (var.isInput()) {
+				// Add input variables
+				varsIn.append("\t" + var.getName());
+				varsIn.append(";\n");
+
+				// Add to print method
+				printMethod.append("\t\tconsole.log(\"\tInput  %s: %f\\n\", \"" + var.getName() + "\" , this." + var.getName() + ");\n");
+
+				// Add fuzzyfiers
+				varsFuzzify.append("\t// FUZZIFY " + var.getName() + "\n");
+				for (LinguisticTerm linguisticTerm : var.linguisticTermsSorted()) {
+					String ltVar = var.getName() + "_" + linguisticTerm.getTermName();
+					varsFuzzify.append("\t" + ltVar + ";\n");
+					fuzzifyMethod.append("\t\tthis." + ltVar + " = this." + linguisticTerm.toStringJSMethodName(var) + "(this." + var.getName() + ");\n");
+
+					// Membership function
+					membershipMethods.append(linguisticTerm.toStringJS(var) + "\n");
+
+					// Add to print method
+					printMethod.append("\t\tconsole.log(\"\t       %s: %f\\n\", \"" + ltVar + "\" , this." + ltVar + ");\n");
+				}
+				varsFuzzify.append("\n");
+
+			} else {
+				int len = ((DefuzzifierContinuous) var.getDefuzzifier()).getLength();
+
+
+				constructor.append("\t\tthis." + var.toStringJSDefuzzifyVarName() + " = new Array(" + len + ");\n");
+
+				// Add output variables
+				varsOut.append("\t" + var.getName());
+				varsOut.append(";\n");
+
+				// Add to print method
+				printMethod.append("\t\tconsole.log(\"\tOutput %s: %f\\n\", \"" + var.getName() + "\" , this." + var.getName() + ");\n");
+
+				// Add defuzzyfier variable
+				varDefuzzifiers.append("\t// DEFUZZIFY " + var.getName() + "\n");
+				varDefuzzifiers.append("\t" + var.toStringJSDefuzzifyVarName() + ";\n");
+
+				// Add to reset method
+				resetMethod.append("\t\tfor (let i = 0 ; i < " + len + "; i++) {\n\t\t\tthis." + var.toStringJSDefuzzifyVarName() + "[i] = 0.0;\n\t\t}\n");
+
+				for (LinguisticTerm linguisticTerm : var.linguisticTermsSorted()) {
+					// Membership function
+					membershipMethods.append(linguisticTerm.toStringJS(var) + "\n");
+
+				}
+				varDefuzzifiers.append("\n");
+
+				defuzzifyMethod.append(var.getDefuzzifier().toStringJS());
+			}
+		}
+
+		//---
+		// Iterate over each ruleSet and append it to output string
+		// Sort ruleBlocks by name
+		//---
+		StringBuffer ruleBlocksStr = new StringBuffer();
+		for (RuleBlock ruleBlock : ruleBlocksSorted()) {
+			ruleBlocksStr.append(ruleBlock.toStringJS());
+			calcMethod.append("\t\tthis.calc_" + ruleBlock.getName() + "();\n");
+		}
+
+		constructor.append("\t}\n");
+		calcMethod.append("\t\tthis.defuzzify();\n\t}\n");
+		defuzzifyMethod.append("\t}\n");
+		fuzzifyMethod.append("\t}\n");
+		printMethod.append("\t}\n");
+		resetMethod.append("\t}\n");
+
+		// Build the whole thing
+		return "class FunctionBlock_" + name + " {\n\n" //
+				+ varsIn + "\n" //
+				+ varsOut //
+				+ "\n" //
+				+ varsFuzzify //
+				+ varDefuzzifiers //
+				+ constructor + "\n" //
+				+ calcMethod + "\n" //
+				+ ruleBlocksStr + "\n" //
+				+ defuzzifyMethod + "\n" //
+				+ fuzzifyMethod + "\n" //
+				+ membershipMethods + "\n" //
+				+ printMethod + "\n" //
+				+ resetMethod + "\n" //
+				+ "};\n\n" //
+				; //
+	}
+
 	@Override
 	public String toStringFcl() {
 		StringBuffer varsIn = new StringBuffer();

src/main/java/net/sourceforge/jFuzzyLogic/JFuzzyLogic.java

@@ -1,6 +1,5 @@
 package net.sourceforge.jFuzzyLogic;
 
-import net.sourceforge.jFuzzyLogic.ruleConnectionMethod.Szczepanski;
 import org.antlr.runtime.RecognitionException;
 
 import net.sourceforge.jFuzzyLogic.demo.tipper.TipperAnimation;
@@ -24,7 +23,7 @@ public class JFuzzyLogic {
 	public static final String BUILD = "2022-05-12";
 	public static final String VERSION_MAJOR = "4.0";
 	public static final String VERSION_SHORT = VERSION_MAJOR + REVISION;
-	public static final String VERSION_NO_NAME = VERSION_SHORT + " (build " + BUILD + "), by " + Pcingola.BY + " and " + Szczepanski.BY;
+	public static final String VERSION_NO_NAME = VERSION_SHORT + " (build " + BUILD + "), by " + Pcingola.BY;
 	public static final String VERSION = SOFTWARE_NAME + " " + VERSION_NO_NAME;
 
 	public static boolean debug = false;
@@ -56,6 +55,21 @@ public class JFuzzyLogic {
 		}
 	}
 
+	/**
+	 * Compile an FCL program into JavaScript
+	 */
+	void compileJS(String fileName) {
+		load(fileName); // Read FIS
+		System.out.println(fis.toStringJS()); // Show JS code
+
+		// Dump JS code to a file (debug)
+		if (debug) {
+			String jsfile = Gpr.HOME + "/x.js";
+			Gpr.debug("Writing to file " + jsfile);
+			Gpr.toFile(jsfile, fis.toStringJS());
+		}
+	}
+
 	/**
 	 * Run demo
 	 */
@@ -170,6 +184,11 @@ public class JFuzzyLogic {
 				String fileName = args[++i];
 				compile(fileName);
 				return;
+			} else if (arg.equals("-j")) {
+				// Sanity check
+				String fileName = args[++i];
+				compileJS(fileName);
+				return;
 			} else if (arg.equals("-e")) {
 				evaluate(i + 1);
 				return;
@@ -202,11 +221,12 @@ public class JFuzzyLogic {
 
 		System.err.println("Usage: java -jar jFuzzyLogic.jar [-noCharts] [{-e|-c}] file.fcl [in_1 ... in_N]");
 		System.err.println("Options:");
-		System.err.println("\t file.fcl                      : Load FCL file and show memebership functions (default, when no option is provided).");
+		System.err.println("\t file.fcl                      : Load FCL file and show membership functions (default, when no option is provided).");
 		System.err.println("\t-c file.fcl                    : Compile. Generate C++ code from FCL file (to STDOUT)");
+		System.err.println("\t-j file.fcl                    : Compile. Generate JavaScript code from FCL file (to STDOUT)");
 		System.err.println("\t-e file.fcl in_1 in_2 ... in_N : Evaluate. Load FCL file, assign inputs i_1, i_2, ..., i_n and evaluate (variables sorted alphabetically).");
 		System.err.println("\t-noCharts                      : Use a mock class for charts. This is used when not compiled using JFreeCharts.");
-		System.err.println("\tdemo                           : Run a demo exmaple (tipper.fcl)");
+		System.err.println("\tdemo                           : Run a demo example (tipper.fcl)");
 		System.exit(1);
 	}
 }

src/main/java/net/sourceforge/jFuzzyLogic/defuzzifier/Defuzzifier.java

@@ -68,4 +68,9 @@ public abstract class Defuzzifier extends FclObject {
 	public String toStringCpp() {
 		throw new RuntimeException("Unimplemented method for class " + this.getClass().getCanonicalName());
 	}
+
+	@Override
+	public String toStringJS() {
+		throw new RuntimeException("Unimplemented method for class " + this.getClass().getCanonicalName());
+	}
 }

src/main/java/net/sourceforge/jFuzzyLogic/defuzzifier/DefuzzifierCenterOfGravity.java

@@ -51,6 +51,27 @@ public class DefuzzifierCenterOfGravity extends DefuzzifierContinuous {
 		return out.toString();
 	}
 
+	@Override
+	public String toStringJS() {
+		StringBuilder out = new StringBuilder();
+
+		String defuzzName = "defuzzify_" + variable.getName();
+		String sumName = "sum_" + variable.getName();
+		String wsumName = "wsum_" + variable.getName();
+
+		out.append("\t\tlet " + sumName + " = 0.0;\n");
+		out.append("\t\tlet " + wsumName + " = 0.0;\n");
+		out.append("\t\tlet x;\n");
+
+		out.append("\t\tfor (let i = 0; i < " + getLength() + "; i++) {\n");
+		out.append("\t\t\tx = " + min + " + i * " + stepSize + ";\n");
+		out.append("\t\t\t" + sumName + " += this." + defuzzName + "[i];\n");
+		out.append("\t\t\t" + wsumName + " += x * this." + defuzzName + "[i];\n");
+		out.append("\t\t}\n");
+		out.append("\t\tthis." + variable.getName() + " = " + wsumName + " / " + sumName + ";\n");
+		return out.toString();
+	}
+
 	@Override
 	public String toStringFcl() {
 		return "METHOD : COG;";

src/main/java/net/sourceforge/jFuzzyLogic/fcl/FclObject.java

@@ -1,6 +1,7 @@
 package net.sourceforge.jFuzzyLogic.fcl;
 
 import net.sourceforge.jFuzzyLogic.CompileCpp;
+import net.sourceforge.jFuzzyLogic.CompileJS;
 
 /**
  * The root of all FCL objects
@@ -8,7 +9,7 @@ import net.sourceforge.jFuzzyLogic.CompileCpp;
  * @author pcingola
  *
  */
-public abstract class FclObject implements CompileCpp {
+public abstract class FclObject implements CompileCpp, CompileJS {
 
 	@Override
 	public String toString() {
@@ -20,5 +21,10 @@ public abstract class FclObject implements CompileCpp {
 		return "// " + this.getClass().getName();
 	}
 
+	@Override
+	public String toStringJS() {
+		return "// " + this.getClass().getName();
+	}
+
 	public abstract String toStringFcl();
 }

src/main/java/net/sourceforge/jFuzzyLogic/membership/MembershipFunction.java

@@ -110,6 +110,11 @@ public abstract class MembershipFunction extends FclObject {
 		throw new RuntimeException("Unimplemented method 'toStringCpp()' for class " + this.getClass().getCanonicalName());
 	}
 
+	@Override
+	public String toStringJS() {
+		throw new RuntimeException("Unimplemented method 'toStringJS()' for class " + this.getClass().getCanonicalName());
+	}
+
 	@Override
 	public String toStringFcl() {
 		return getName();

src/main/java/net/sourceforge/jFuzzyLogic/membership/MembershipFunctionPieceWiseLinear.java

@@ -157,6 +157,17 @@ public class MembershipFunctionPieceWiseLinear extends MembershipFunctionContinu
 		return sb.toString();
 	}
 
+	@Override
+	public String toStringJS() {
+		StringBuilder sb = new StringBuilder();
+		int i, len = x.length;
+		sb.append("\t\tif (x <= " + x[0].getValue() + ")\t\treturn " + y[0].getValue() + ";\n");
+		sb.append("\t\tif (x > " + x[len - 1].getValue() + ")\t\treturn " + y[len - 1].getValue() + ";\n");
+		for (i = 1; i < len; i++)
+			sb.append("\t\tif (x <= " + x[i].getValue() + ")\t\treturn " + y[i - 1].getValue() + " + (" + y[i].getValue() + " - " + y[i - 1].getValue() + ") * ((x - " + x[i - 1].getValue() + ") / (" + x[i].getValue() + " - " + x[i - 1].getValue() + "));\n");
+		return sb.toString();
+	}
+
 	/** FCL representation */
 	@Override
 	public String toStringFcl() {

src/main/java/net/sourceforge/jFuzzyLogic/membership/functions/MffFunction.java

@@ -116,6 +116,18 @@ public abstract class MffFunction extends FclObject {
 		return out + ")";
 	}
 
+	@Override
+	public String toStringJS() {
+		if (terms == null) return "";
+		String out = this.getClass().getSimpleName() + "(";
+		for (int i = 0; i < terms.length; i++) {
+			out += terms[i].toStringFcl();
+			if (i < terms.length - 1) out += ", ";
+		}
+
+		return out + ")";
+	}
+
 	@Override
 	public String toStringFcl() {
 		if (terms == null) return "";

src/main/java/net/sourceforge/jFuzzyLogic/rule/LinguisticTerm.java

@@ -59,10 +59,22 @@ public class LinguisticTerm extends FclObject implements Comparable<LinguisticTe
 		return sb.toString();
 	}
 
+	public String toStringJS(Variable var) {
+		StringBuilder sb = new StringBuilder();
+		sb.append("\t" + toStringJSMethodName(var) + "(x) {\n");
+		sb.append(membershipFunction.toStringJS());
+		sb.append("\t}\n");
+		return sb.toString();
+	}
+
 	public String toStringCppMethodName(Variable var) {
 		return "membership_" + var.getName() + "_" + getTermName();
 	}
 
+	public String toStringJSMethodName(Variable var) {
+		return "membership_" + var.getName() + "_" + getTermName();
+	}
+
 	@Override
 	public String toStringFcl() {
 		return "TERM " + termName + " := " + membershipFunction.toStringFcl() + ";";

src/main/java/net/sourceforge/jFuzzyLogic/rule/Rule.java

@@ -187,6 +187,24 @@ public class Rule extends FclObject implements CompileCpp {
 		return sb.toString();
 	}
 
+	@Override
+	public String toStringJS() {
+		RuleActivationMethod ruleActivationMethod = ruleBlock.getRuleActivationMethod();
+
+		StringBuilder sb = new StringBuilder();
+
+		// Show antecedents
+		String dosName = "degreeOfSupport_" + name;
+		sb.append("\t\tlet " + dosName + " = " + weight + " * (" + antecedents.toStringJS() + ");\n");
+
+		// Accumulate & activate
+		RuleAccumulationMethod ruleAccumulationMethod = ruleBlock.getRuleAccumulationMethod();
+		for (RuleTerm term : consequents)
+			sb.append(ruleActivationMethod.toStringJS(term, ruleAccumulationMethod, dosName) + "\n");
+
+		return sb.toString();
+	}
+
 	@Override
 	public String toStringFcl() {
 		String strAnt = "", strCon = "";

src/main/java/net/sourceforge/jFuzzyLogic/rule/RuleBlock.java

@@ -441,6 +441,28 @@ public class RuleBlock extends FclObject implements Iterable<Rule>, Comparable<R
 		return rb.toString();
 	}
 
+	public String toStringJS() {
+		StringBuffer rb = new StringBuffer();
+		rb.append("\t// RULEBLOCK " + name + "\n");
+		rb.append("\tcalc_" + name + "() {\n");
+
+		// Show rules
+		int ruleNum = 1;
+		for (Rule rule : rules) {
+			// Rule name/number
+			String name = rule.getName();
+			if ((name == null) || (name.equals(""))) name = Integer.toString(ruleNum);
+
+			rb.append("\t\t// RULE " + name + " : " + rule.toStringFcl() + "\n");
+			rb.append(rule.toStringJS());
+			ruleNum++;
+		}
+
+		rb.append("\t}\n");
+
+		return rb.toString();
+	}
+
 	@Override
 	public String toStringFcl() {
 		StringBuffer rb = new StringBuffer();

src/main/java/net/sourceforge/jFuzzyLogic/rule/RuleExpression.java

@@ -237,6 +237,35 @@ public class RuleExpression extends FclObject implements Iterable<Variable>, Com
 		return str;
 	}
 
+	@Override
+	public String toStringJS() {
+		String str = "";
+		String connector = ruleConnectionMethod.toStringJS();
+
+		if ((term1 == null) || (term2 == null)) {
+			// Only one term?
+			if (term1 != null) str += term1.toStringJS();
+			if (term2 != null) str += term2.toStringJS();
+		} else {
+			str += connector + "(";
+
+			// Both terms connected
+			if (isFuzzyRuleExpression(term1)) str += ((RuleExpression) term1).toStringJS();
+			else if (isFuzzyRuleTerm(term1)) str += ((RuleTerm) term1).toStringJS();
+
+			str += ", ";
+
+			if (isFuzzyRuleExpression(term2)) str += ((RuleExpression) term2).toStringJS();
+			else if (isFuzzyRuleTerm(term2)) str += ((RuleTerm) term2).toStringJS();
+
+			str += ")";
+		}
+
+		if (negated) str = "1.0 - (" + str + ")";
+
+		return str;
+	}
+
 	@Override
 	public String toStringFcl() {
 		String str = "";

src/main/java/net/sourceforge/jFuzzyLogic/rule/RuleTerm.java

@@ -73,10 +73,21 @@ public class RuleTerm extends FclObject {
 		return neg + variable.getName() + "_" + termName;
 	}
 
+	@Override
+	public String toStringJS() {
+		String neg = "";
+		if (negated) neg = "1 -";
+		return neg + "this." + variable.getName() + "_" + termName;
+	}
+
 	public String toStringCppDeffName() {
 		return getVariable().getName() + "_" + getTermName();
 	}
 
+	public String toStringJSDeffName() {
+		return getVariable().getName() + "_" + getTermName();
+	}
+
 	@Override
 	public String toStringFcl() {
 		String is = "IS";

src/main/java/net/sourceforge/jFuzzyLogic/rule/Variable.java

@@ -338,6 +338,27 @@ public class Variable extends FclObject implements Comparable<Variable>, Iterabl
 		return "defuzzify_" + getName();
 	}
 
+	@Override
+	public String toStringJS() {
+		String str = name + " : \n";
+
+		// Show defuzifier for "output" variables, value for "input" variables
+		if (defuzzifier != null) str += "\tDefuzzifier : " + defuzzifier.toString() + "\n\tLatest defuzzified value: " + latestDefuzzifiedValue + "\n";
+		else str += "\tValue: " + value + "\n";
+
+		if (!Double.isNaN(defaultValue)) str += "\tDefault value: " + defaultValue + "\n";
+
+		// Show each 'termName' and it's membership function
+		for (LinguisticTerm linguisticTerm : this)
+			str += "\t" + linguisticTerm.toString(value) + "\n";
+
+		return str;
+	}
+
+	public String toStringJSDefuzzifyVarName() {
+		return "defuzzify_" + getName();
+	}
+
 	@Override
 	public String toStringFcl() {
 		return name;

src/main/java/net/sourceforge/jFuzzyLogic/ruleAccumulationMethod/RuleAccumulationMethod.java

@@ -49,8 +49,17 @@ public abstract class RuleAccumulationMethod extends FclObject {
 		return "ruleAccumulationMethod_" + getName();
 	}
 
+	@Override
+	public String toStringJS() {
+		return "ruleAccumulationMethod_" + getName();
+	}
+
 	public String toStringCppFunction() {
-		throw new RuntimeException("Unimplemented method foe class " + this.getClass().getCanonicalName());
+		throw new RuntimeException("Unimplemented method for class " + this.getClass().getCanonicalName());
+	}
+
+	public String toStringJSFunction() {
+		throw new RuntimeException("Unimplemented method for class " + this.getClass().getCanonicalName());
 	}
 
 	@Override

src/main/java/net/sourceforge/jFuzzyLogic/ruleAccumulationMethod/RuleAccumulationMethodMax.java

@@ -24,6 +24,11 @@ public class RuleAccumulationMethodMax extends RuleAccumulationMethod {
 		return "double " + toStringCpp() + "(double defuzzifierValue, double valueToAggregate)\t{ return ( defuzzifierValue > valueToAggregate ? defuzzifierValue : valueToAggregate ); }\n";
 	}
 
+	@Override
+	public String toStringJSFunction() {
+		return "function " + toStringJS() + "(defuzzifierValue, valueToAggregate) {\n\treturn (defuzzifierValue > valueToAggregate ? defuzzifierValue : valueToAggregate);\n}\n";
+	}
+
 	/**
 	 * @see net.sourceforge.jFuzzyLogic.ruleAccumulationMethod.RuleAccumulationMethod#toStringFcl()
 	 */

src/main/java/net/sourceforge/jFuzzyLogic/ruleActivationMethod/RuleActivationMethod.java

@@ -157,7 +157,49 @@ public abstract class RuleActivationMethod extends FclObject {
 	}
 
 	public String toStringCppFunction() {
-		throw new RuntimeException("Unimplemented method foe class " + this.getClass().getCanonicalName());
+		throw new RuntimeException("Unimplemented method for class " + this.getClass().getCanonicalName());
+	}
+
+	@Override
+	public String toStringJS() {
+		return "ruleActivationMethod_" + name;
+	}
+
+	public String toStringJS(RuleTerm fuzzyRuleTerm, RuleAccumulationMethod ruleAccumulationMethod, String degreeOfSupportName) {
+		StringBuilder out = new StringBuilder();
+
+		Variable variable = fuzzyRuleTerm.getVariable();
+		Defuzzifier defuzzifier = variable.getDefuzzifier();
+
+		if (fuzzyRuleTerm.getMembershipFunction().isDiscrete()) {
+			throw new RuntimeException("Unimplemented for discre cases!");
+		} else {
+			//---
+			// Continuous case
+			//---
+			DefuzzifierContinuous defuzzifierContinuous = (DefuzzifierContinuous) defuzzifier;
+
+			// Add membership function to defuzzifier
+			out.append("\t\tif (" + degreeOfSupportName + " > 0) {\n");
+			out.append("\t\t\tfor (let i = 0; i < " + defuzzifierContinuous.getLength() + "; i++) {\n");
+			out.append("\t\t\t\tlet x = " + defuzzifierContinuous.getMin() + " + i * " + defuzzifierContinuous.getStepSize() + ";\n");
+			// Is term negated?
+			if (fuzzyRuleTerm.isNegated()) out.append("\t\t\tlet membership = 1 - mf.membership(x);\n");
+			else out.append("\t\t\t\tlet membership = this." + fuzzyRuleTerm.getLinguisticTerm().toStringJSMethodName(fuzzyRuleTerm.getVariable()) + "(x);\n");
+
+			out.append("\t\t\t\tlet y = " + toStringJS() + "(" + degreeOfSupportName + " , membership);\n");
+
+			// Aggregate value
+			out.append("\t\t\t\tthis." + variable.toStringJSDefuzzifyVarName() + "[i] = " + ruleAccumulationMethod.toStringJS() + "(this." + variable.toStringJSDefuzzifyVarName() + "[i], y);\n");
+			out.append("\t\t\t}\n");
+			out.append("\t\t}\n");
+		}
+
+		return out.toString();
+	}
+
+	public String toStringJSFunction() {
+		throw new RuntimeException("Unimplemented method for class " + this.getClass().getCanonicalName());
 	}
 
 }

src/main/java/net/sourceforge/jFuzzyLogic/ruleActivationMethod/RuleActivationMethodMin.java

@@ -22,6 +22,11 @@ public class RuleActivationMethodMin extends RuleActivationMethod {
 		return "double " + toStringCpp() + "(double degreeOfSupport, double membership)\t{ return (degreeOfSupport < membership ? degreeOfSupport : membership); }\n";
 	}
 
+	@Override
+	public String toStringJSFunction() {
+		return "function " + toStringJS() + "(degreeOfSupport, membership) {\n\treturn (degreeOfSupport < membership ? degreeOfSupport : membership);\n}\n";
+	}
+
 	/** Printable FCL version */
 	@Override
 	public String toStringFcl() {

src/main/java/net/sourceforge/jFuzzyLogic/ruleConnectionMethod/RuleConnectionMethod.java

@@ -40,8 +40,17 @@ public abstract class RuleConnectionMethod extends FclObject {
 		return "ruleConnectionMethod_" + name;
 	}
 
+	@Override
+	public String toStringJS() {
+		return "ruleConnectionMethod_" + name;
+	}
+
 	public String toStringCppFunction() {
-		throw new RuntimeException("Unimplemented method foe class " + this.getClass().getCanonicalName());
+		throw new RuntimeException("Unimplemented method for class " + this.getClass().getCanonicalName());
+	}
+
+	public String toStringJSFunction() {
+		throw new RuntimeException("Unimplemented method for class " + this.getClass().getCanonicalName());
 	}
 
 }

src/main/java/net/sourceforge/jFuzzyLogic/ruleConnectionMethod/RuleConnectionMethodAndMin.java

@@ -31,6 +31,11 @@ public class RuleConnectionMethodAndMin extends RuleConnectionMethod {
 		return "double " + toStringCpp() + "(double antecedent1, double antecedent2)\t{ return (antecedent1 < antecedent2 ? antecedent1 : antecedent2); }\n";
 	}
 
+	@Override
+	public String toStringJSFunction() {
+		return "function " + toStringJS() + "(antecedent1, antecedent2) {\n\treturn (antecedent1 < antecedent2 ? antecedent1 : antecedent2);\n}\n";
+	}
+
 	@Override
 	public String toStringFcl() {
 		return "AND : MIN;";

src/main/java/net/sourceforge/jFuzzyLogic/ruleConnectionMethod/RuleConnectionMethodOrMax.java

@@ -31,6 +31,11 @@ public class RuleConnectionMethodOrMax extends RuleConnectionMethod {
 		return "double " + toStringCpp() + "(double antecedent1, double antecedent2)\t{ return (antecedent1 > antecedent2 ? antecedent1 : antecedent2); }\n";
 	}
 
+	@Override
+	public String toStringJSFunction() {
+		return "function " + toStringJS() + "(antecedent1, antecedent2) {\n\treturn (antecedent1 > antecedent2 ? antecedent1 : antecedent2);\n}\n";
+	}
+
 	@Override
 	public String toStringFcl() {
 		return "OR: MAX;";

src/main/java/net/sourceforge/jFuzzyLogic/ruleConnectionMethod/Szczepanski.java

@@ -1,11 +0,0 @@
-package net.sourceforge.jFuzzyLogic.ruleConnectionMethod;
-
-/**
- * Author's data
- * @author marcin-szczepanski
- */
-public class Szczepanski {
-
-	public static final String EMAIL = "marcin.szczepanski@amu.edu.pl";
-	public static final String BY = "Marcin Szczepanski";
-}