Updated rules

src/main/java/org/warp/picalculator/math/rules/RulesManager.java

@@ -59,15 +59,18 @@ public class RulesManager {
 			}
 			ScriptEngine engine = new ScriptEngineManager().getEngineByName("nashorn");
 			List<String> ruleLines = Files.readAllLines(rulesPath);
+			ruleLines.remove(0); //Remove the headers
 			for (String rulesLine : ruleLines) {
-				String[] ruleDetails = rulesLine.split(",", 1);
-				String ruleName = ruleDetails[0];
-				Utils.out.println("Evaluating /rules/" + ruleName + ".js");
-				InputStream resourcePath = Utils.getResourceStream("/rules/" + ruleName.replace(".", "_") + ".js");
-				if (resourcePath == null) {
-					System.err.println(new FileNotFoundException("/rules/" + ruleName + ".js not found!"));
-				} else {
-					engine.eval(new InputStreamReader(resourcePath));
+				if (rulesLine.length() > 0) {
+					String[] ruleDetails = rulesLine.split(",", 1);
+					String ruleName = ruleDetails[0];
+					Utils.out.println("Evaluating /rules/" + ruleName + ".js");
+					InputStream resourcePath = Utils.getResourceStream("/rules/" + ruleName.replace(".", "_") + ".js");
+					if (resourcePath == null) {
+						System.err.println(new FileNotFoundException("/rules/" + ruleName + ".js not found!"));
+					} else {
+						engine.eval(new InputStreamReader(resourcePath));
+					}
 				}
 			}
 		} catch (URISyntaxException | IOException e) {
@@ -96,10 +99,10 @@ public class RulesManager {
 		}
 	}
 	
-	private static Expression generateUselessExpression() {
+	private static Function generateUselessExpression() {
 		MathContext mc = new MathContext();
-		Expression expr = new Expression(mc);
-		expr = (Expression) expr.setParameter(new Variable(mc, 'x', V_TYPE.VARIABLE));
+		Function expr = new Expression(mc);
+		expr = expr.setParameter(0, new Variable(mc, 'x', V_TYPE.VARIABLE));
 		return expr;
 	}
 	

src/main/resources/rules.csv

@@ -1,5 +1,13 @@
-functions/Expression
-functions/Division
-ExpandRule1
-ExpandRule2
+Rule file
+functions/Division
+functions/EmptyNumber
+functions/Expression
+functions/Joke
+functions/Multiplication
+functions/Negative
+functions/Number
+functions/Power
+functions/Root
+ExpandRule1
+ExpandRule2
 ExpandRule5

src/main/resources/rules/functions/EmptyNumber.js

@@ -0,0 +1,35 @@
+// Imports
+var ObjectArrayList = Java.type("it.unimi.dsi.fastutil.objects.ObjectArrayList");
+var ScriptUtils = org.warp.picalculator.ScriptUtils;
+var Rule = org.warp.picalculator.math.rules.Rule;
+var RuleType = org.warp.picalculator.math.rules.RuleType;
+var RulesManager = org.warp.picalculator.math.rules.RulesManager;
+
+/**
+ * EmptyNumber
+ *
+ * 
+ * @author Andrea Cavalli
+ *
+ */
+var rule = {
+	// Rule name
+	getRuleName: function() {
+		return "EmptyNumber";
+	},
+	// Rule type
+	getRuleType: function() {
+		return RuleType.CALCULATION;
+	},
+	/* Rule function
+	   Returns:
+	     - null if it's not executable on the function "f"
+	     - An ObjectArrayList<Function> if it did something
+	*/
+	execute: function(f) {
+		return null;
+	}
+}
+
+//Add this rule to the list of rules
+RulesManager.addRule(engine.getInterface(rule, Rule.class));

src/main/resources/rules/functions/Joke.js

@@ -0,0 +1,35 @@
+// Imports
+var ObjectArrayList = Java.type("it.unimi.dsi.fastutil.objects.ObjectArrayList");
+var ScriptUtils = org.warp.picalculator.ScriptUtils;
+var Rule = org.warp.picalculator.math.rules.Rule;
+var RuleType = org.warp.picalculator.math.rules.RuleType;
+var RulesManager = org.warp.picalculator.math.rules.RulesManager;
+
+/**
+ * Joke
+ *
+ * 
+ * @author Andrea Cavalli
+ *
+ */
+var rule = {
+	// Rule name
+	getRuleName: function() {
+		return "Joke";
+	},
+	// Rule type
+	getRuleType: function() {
+		return RuleType.CALCULATION;
+	},
+	/* Rule function
+	   Returns:
+	     - null if it's not executable on the function "f"
+	     - An ObjectArrayList<Function> if it did something
+	*/
+	execute: function(f) {
+		return null;
+	}
+}
+
+//Add this rule to the list of rules
+RulesManager.addRule(engine.getInterface(rule, Rule.class));

src/main/resources/rules/functions/Multiplication.js

@@ -0,0 +1,52 @@
+// Imports
+var ObjectArrayList = Java.type("it.unimi.dsi.fastutil.objects.ObjectArrayList");
+var ScriptUtils = org.warp.picalculator.ScriptUtils;
+var Rule = org.warp.picalculator.math.rules.Rule;
+var RuleType = org.warp.picalculator.math.rules.RuleType;
+var RulesManager = org.warp.picalculator.math.rules.RulesManager;
+var Multiplication = org.warp.picalculator.math.functions.Multiplication;
+var Sum = org.warp.picalculator.math.functions.Sum;
+var Subtraction = org.warp.picalculator.math.functions.Subtraction;
+var SumSubtraction = org.warp.picalculator.math.functions.SumSubtraction;
+var Number = org.warp.picalculator.math.functions.Number;
+var Division = org.warp.picalculator.math.functions.Division;
+
+/**
+ * Multiplication
+ * a*b = c
+ * 
+ * @author Andrea Cavalli
+ *
+ */
+var rule = {
+	// Rule name
+	getRuleName: function() {
+		return "Multiplication";
+	},
+	// Rule type
+	getRuleType: function() {
+		return RuleType.CALCULATION;
+	},
+	/* Rule function
+	   Returns:
+	     - null if it's not executable on the function "f"
+	     - An ObjectArrayList<Function> if it did something
+	*/
+	execute: function(f) {
+		if (ScriptUtils.instanceOf(f, Multiplication.class)) {
+			var result = new ObjectArrayList();
+			var variable1 = f.getParameter1();
+			var variable2 = f.getParameter2();
+			var mathContext = f.getMathContext();
+			if (ScriptUtils.instanceOf(variable1, Number.class) && ScriptUtils.instanceOf(variable2, Number.class)) {
+				//multiply a by b (a*b = c)
+				result.add(variable1.multiply(variable2));
+				return result;
+			}
+		}
+		return null;
+	}
+}
+
+//Add this rule to the list of rules
+RulesManager.addRule(engine.getInterface(rule, Rule.class));

src/main/resources/rules/functions/Negative.js

@@ -0,0 +1,62 @@
+// Imports
+var ObjectArrayList = Java.type("it.unimi.dsi.fastutil.objects.ObjectArrayList");
+var ScriptUtils = org.warp.picalculator.ScriptUtils;
+var Rule = org.warp.picalculator.math.rules.Rule;
+var RuleType = org.warp.picalculator.math.rules.RuleType;
+var RulesManager = org.warp.picalculator.math.rules.RulesManager;
+var Number = org.warp.picalculator.math.functions.Number;
+var Negative = org.warp.picalculator.math.functions.Negative;
+var Error = org.warp.picalculator.Error;
+var Errors = org.warp.picalculator.Errors;
+var NullPointerException = java.lang.NullPointerException;
+var NumberFormatException = java.lang.NumberFormatException;
+var ArithmeticException = java.lang.ArithmeticException;
+
+/**
+ * Negative
+ * -a = b
+ * 
+ * @author Andrea Cavalli
+ *
+ */
+var rule = {
+	// Rule name
+	getRuleName: function() {
+		return "Negative";
+	},
+	// Rule type
+	getRuleType: function() {
+		return RuleType.CALCULATION;
+	},
+	/* Rule function
+	   Returns:
+	     - null if it's not executable on the function "f"
+	     - An ObjectArrayList<Function> if it did something
+	*/
+	execute: function(f) {
+		if (ScriptUtils.instanceOf(f, Negative.class)) {
+			var result = new ObjectArrayList();
+			var variable = f.getParameter();
+			var mathContext = f.getMathContext();
+			if (ScriptUtils.instanceOf(variable, Number.class)) {
+				//-a = a*-1 = b
+				try {
+					result.add(variable.multiply(new Number(mathContext, -1)));
+				} catch (ex) {
+					if (ScriptUtils.instanceOf(ex, NullPointerException.class)) {
+						throw new Error(Errors.ERROR);
+					} else if (ScriptUtils.instanceOf(ex, NumberFormatException.class)) {
+						throw new Error(Errors.SYNTAX_ERROR);
+					} else if (ScriptUtils.instanceOf(ex, ArithmeticException.class)) {
+						throw new Error(Errors.NUMBER_TOO_SMALL);
+					}
+				}
+				return result;
+			}
+		}
+		return null;
+	}
+}
+
+//Add this rule to the list of rules
+RulesManager.addRule(engine.getInterface(rule, Rule.class));

src/main/resources/rules/functions/Number.js

@@ -0,0 +1,49 @@
+// Imports
+var ObjectArrayList = Java.type("it.unimi.dsi.fastutil.objects.ObjectArrayList");
+var ScriptUtils = org.warp.picalculator.ScriptUtils;
+var Rule = org.warp.picalculator.math.rules.Rule;
+var RuleType = org.warp.picalculator.math.rules.RuleType;
+var RulesManager = org.warp.picalculator.math.rules.RulesManager;
+var BigInteger = java.math.BigInteger;
+
+/**
+ * Number
+ *
+ * 
+ * @author Andrea Cavalli
+ *
+ */
+var rule = {
+	// Rule name
+	getRuleName: function() {
+		return "Number";
+	},
+	// Rule type
+	getRuleType: function() {
+		return RuleType.CALCULATION;
+	},
+	/* Rule function
+	   Returns:
+	     - null if it's not executable on the function "f"
+	     - An ObjectArrayList<Function> if it did something
+	*/
+	execute: function(f) {
+		if (ScriptUtils.instanceOf(f, Number.class)) {
+			var result = new ObjectArrayList();
+			var mathContext = f.getMathContext();
+			if (mathContext.exactMode) {
+				if (f.isInteger() == false) {
+					var divisor = new Number(mathContext, BigInteger.TEN.pow(f.getNumberOfDecimalPlaces()));
+					var number = new Number(mathContext, f.getTerm().multiply(divisor.term));
+					var div = new Division(mathContext, number, divisor);
+					result.add(div);
+					return result;
+				}
+			}
+		}
+		return null;
+	}
+}
+
+//Add this rule to the list of rules
+RulesManager.addRule(engine.getInterface(rule, Rule.class));

src/main/resources/rules/functions/Power.js

@@ -0,0 +1,53 @@
+// Imports
+var ObjectArrayList = Java.type("it.unimi.dsi.fastutil.objects.ObjectArrayList");
+var ScriptUtils = org.warp.picalculator.ScriptUtils;
+var Rule = org.warp.picalculator.math.rules.Rule;
+var RuleType = org.warp.picalculator.math.rules.RuleType;
+var RulesManager = org.warp.picalculator.math.rules.RulesManager;
+var Multiplication = org.warp.picalculator.math.functions.Multiplication;
+var Sum = org.warp.picalculator.math.functions.Sum;
+var Subtraction = org.warp.picalculator.math.functions.Subtraction;
+var SumSubtraction = org.warp.picalculator.math.functions.SumSubtraction;
+var Number = org.warp.picalculator.math.functions.Number;
+var Division = org.warp.picalculator.math.functions.Division;
+var Power = org.warp.picalculator.math.functions.Power;
+
+/**
+ * Power
+ * a^b = c
+ * 
+ * @author Andrea Cavalli
+ *
+ */
+var rule = {
+	// Rule name
+	getRuleName: function() {
+		return "Power";
+	},
+	// Rule type
+	getRuleType: function() {
+		return RuleType.CALCULATION;
+	},
+	/* Rule function
+	   Returns:
+	     - null if it's not executable on the function "f"
+	     - An ObjectArrayList<Function> if it did something
+	*/
+	execute: function(f) {
+		if (ScriptUtils.instanceOf(f, Power.class)) {
+			var result = new ObjectArrayList();
+			var variable1 = f.getParameter1();
+			var variable2 = f.getParameter2();
+			var mathContext = f.getMathContext();
+			if (ScriptUtils.instanceOf(variable1, Number.class) && ScriptUtils.instanceOf(variable2, Number.class)) {
+				//a^b = c
+				result.add(variable1.pow(variable2));
+				return result;
+			}
+		}
+		return null;
+	}
+}
+
+//Add this rule to the list of rules
+RulesManager.addRule(engine.getInterface(rule, Rule.class));

src/main/resources/rules/functions/Root.js

@@ -0,0 +1,78 @@
+// Imports
+var ObjectArrayList = Java.type("it.unimi.dsi.fastutil.objects.ObjectArrayList");
+var ScriptUtils = org.warp.picalculator.ScriptUtils;
+var Rule = org.warp.picalculator.math.rules.Rule;
+var RuleType = org.warp.picalculator.math.rules.RuleType;
+var RulesManager = org.warp.picalculator.math.rules.RulesManager;
+var Multiplication = org.warp.picalculator.math.functions.Multiplication;
+var Sum = org.warp.picalculator.math.functions.Sum;
+var Subtraction = org.warp.picalculator.math.functions.Subtraction;
+var SumSubtraction = org.warp.picalculator.math.functions.SumSubtraction;
+var Number = org.warp.picalculator.math.functions.Number;
+var Division = org.warp.picalculator.math.functions.Division;
+var Root = org.warp.picalculator.math.functions.Root;
+var RootSquare = org.warp.picalculator.math.functions.RootSquare;
+var BigDecimal = java.math.BigDecimal;
+
+/**
+ * Root
+ * a√b = c
+ * 
+ * @author Andrea Cavalli
+ *
+ */
+var rule = {
+	// Rule name
+	getRuleName: function() {
+		return "Power";
+	},
+	// Rule type
+	getRuleType: function() {
+		return RuleType.CALCULATION;
+	},
+	/* Rule function
+	   Returns:
+	     - null if it's not executable on the function "f"
+	     - An ObjectArrayList<Function> if it did something
+	*/
+	execute: function(f) {
+		var isSquare = false;
+		if (ScriptUtils.instanceOf(f, Root.class) || (isSquare = ScriptUtils.instanceOf(f, RootSquare.class))) {
+			var result = new ObjectArrayList();
+			var mathContext = f.getMathContext();
+			var variable1 = isSquare?new Number(mathContext, 2):f.getParameter1();
+			var variable2 = isSquare?f.getParameter():f.getParameter2();
+			var isSolvable = false;
+			var canBePorted = false;
+			if (ScriptUtils.instanceOf(variable1, Number.class) && ScriptUtils.instanceOf(variable2, Number.class)) {
+				isSolvable = isSolvable|!mathContext.exactMode;
+				if (!isSolvable) {
+					try {
+						var resultVar = variable2.pow(new Number(mathContext, BigDecimal.ONE).divide(variable1));
+						var originalVariable = resultVar.pow(new Number(mathContext, 2));
+						if (originalVariable.equals(parameter2)) {
+							isSolvable = true;
+						}
+					} catch (ex) {
+						ex.printStackTrace();
+					}
+				}
+			}
+			if (!isSquare && !isSolvable && ScriptUtils.instanceOf(variable1, Number.class) && variable1.equals(new Number(mathContext, 2))) {
+				canBePorted = true;
+			}
+			
+			if (isSolvable) {
+				result.add(variable2.pow(new Number(mathContext, BigInteger.ONE).divide(variable1)));
+				return result;
+			}
+			if (canBePorted) {
+				result.add(new RootSquare(mathContext, variable2));
+			}
+		}
+		return null;
+	}
+}
+
+//Add this rule to the list of rules
+RulesManager.addRule(engine.getInterface(rule, Rule.class));