Changed the internal structure of the function parser

src/main/java/org/warp/picalculator/gui/expression/blocks/Block.java

@@ -1,10 +1,13 @@
 package org.warp.picalculator.gui.expression.blocks;
 
+import org.warp.picalculator.Error;
 import org.warp.picalculator.gui.GraphicalElement;
 import org.warp.picalculator.gui.expression.Caret;
 import org.warp.picalculator.gui.expression.ExtraMenu;
 import org.warp.picalculator.gui.graphicengine.GraphicEngine;
 import org.warp.picalculator.gui.graphicengine.Renderer;
+import org.warp.picalculator.math.MathContext;
+import org.warp.picalculator.math.parser.features.interfaces.Feature;
 
 public abstract class Block implements GraphicalElement {
 
@@ -56,10 +59,10 @@ public abstract class Block implements GraphicalElement {
 	}
 	
 	public abstract void setSmall(boolean small);
-
-	public abstract int getClassID();
 	
 	public ExtraMenu<?> getExtraMenu() {
 		return null;
 	}
+
+	public abstract Feature toFeature(MathContext context) throws Error;
 }

src/main/java/org/warp/picalculator/gui/expression/blocks/BlockChar.java

@@ -3,11 +3,12 @@ package org.warp.picalculator.gui.expression.blocks;
 import org.warp.picalculator.gui.expression.Caret;
 import org.warp.picalculator.gui.graphicengine.GraphicEngine;
 import org.warp.picalculator.gui.graphicengine.Renderer;
+import org.warp.picalculator.math.MathContext;
+import org.warp.picalculator.math.parser.features.FeatureChar;
+import org.warp.picalculator.math.parser.features.interfaces.Feature;
 
 public class BlockChar extends Block {
 
-	public static final int CLASS_ID = 0x00000001;
-
 	private final char ch;
 
 	public BlockChar(char ch) {
@@ -54,14 +55,14 @@ public class BlockChar extends Block {
 		return ch;
 	}
 
-	@Override
-	public int getClassID() {
-		return CLASS_ID;
-	}
-
 	@Override
 	public int computeCaretMaxBound() {
 		return 0;
 	}
 
+	@Override
+	public Feature toFeature(MathContext context) {
+		return new FeatureChar(getChar());
+	}
+
 }

src/main/java/org/warp/picalculator/gui/expression/blocks/BlockContainer.java

@@ -1,11 +1,17 @@
 package org.warp.picalculator.gui.expression.blocks;
 
+import org.warp.picalculator.Error;
+import org.warp.picalculator.Errors;
 import org.warp.picalculator.gui.GraphicalElement;
 import org.warp.picalculator.gui.expression.Caret;
 import org.warp.picalculator.gui.expression.CaretState;
 import org.warp.picalculator.gui.graphicengine.BinaryFont;
 import org.warp.picalculator.gui.graphicengine.GraphicEngine;
 import org.warp.picalculator.gui.graphicengine.Renderer;
+import org.warp.picalculator.math.Function;
+import org.warp.picalculator.math.MathContext;
+import org.warp.picalculator.math.parser.MathParser;
+import org.warp.picalculator.math.parser.features.interfaces.Feature;
 
 import it.unimi.dsi.fastutil.objects.ObjectArrayList;
 
@@ -340,4 +346,18 @@ public class BlockContainer implements GraphicalElement {
 		return maxpos + 1;
 	}
 
+	public Function toFunction(MathContext context) throws Error {
+		ObjectArrayList<Block> blocks = getContent();
+		final ObjectArrayList<Feature> blockFeatures = new ObjectArrayList<>();
+
+		for (final Block block : blocks) {
+			final Feature blockFeature = block.toFeature(context);
+			if (blockFeature == null) throw new Error(Errors.NOT_IMPLEMENTED, "The block " + block.getClass().getSimpleName() + " isn't a known Block");
+			blockFeatures.add(blockFeature);
+		}
+
+		final Function result = MathParser.joinFeatures(context, blockFeatures);
+		return result;
+	}
+
 }

src/main/java/org/warp/picalculator/gui/expression/blocks/BlockDivision.java

@@ -1,13 +1,16 @@
 package org.warp.picalculator.gui.expression.blocks;
 
+import org.warp.picalculator.Error;
 import org.warp.picalculator.gui.expression.Caret;
 import org.warp.picalculator.gui.graphicengine.GraphicEngine;
 import org.warp.picalculator.gui.graphicengine.Renderer;
+import org.warp.picalculator.math.Function;
+import org.warp.picalculator.math.MathContext;
+import org.warp.picalculator.math.parser.features.FeatureDivision;
+import org.warp.picalculator.math.parser.features.interfaces.Feature;
 
 public class BlockDivision extends Block {
 
-	public static final int CLASS_ID = 0x00000002;
-
 	private final BlockContainer containerUp;
 	private final BlockContainer containerDown;
 
@@ -104,13 +107,15 @@ public class BlockDivision extends Block {
 		return containerDown;
 	}
 
-	@Override
-	public int getClassID() {
-		return CLASS_ID;
-	}
-
 	@Override
 	public int computeCaretMaxBound() {
 		return containerUp.computeCaretMaxBound() + containerDown.computeCaretMaxBound();
 	}
+
+	@Override
+	public Feature toFeature(MathContext context) throws Error {
+		final Function upper = getUpperContainer().toFunction(context);
+		final Function lower = getLowerContainer().toFunction(context);
+		return new FeatureDivision(upper, lower);
+	}
 }

src/main/java/org/warp/picalculator/gui/expression/blocks/BlockExponentialNotation.java

@@ -7,8 +7,6 @@ import org.warp.picalculator.gui.graphicengine.Renderer;
 public class BlockExponentialNotation extends BlockPower {
 	private int bw;
 	private int bh;
-
-	public static final int CLASS_ID = 0x00000006;
 	
 	@Override
 	public void draw(GraphicEngine ge, Renderer r, int x, int y, Caret caret) {
@@ -25,9 +23,4 @@ public class BlockExponentialNotation extends BlockPower {
 		bh = BlockContainer.getDefaultCharHeight(small);
 		this.width+=bw;
 	}
-
-	@Override
-	public int getClassID() {
-		return CLASS_ID;
-	}
 }

src/main/java/org/warp/picalculator/gui/expression/blocks/BlockParenthesis.java

@@ -1,13 +1,16 @@
 package org.warp.picalculator.gui.expression.blocks;
 
+import org.warp.picalculator.Error;
 import org.warp.picalculator.gui.expression.Caret;
 import org.warp.picalculator.gui.graphicengine.GraphicEngine;
 import org.warp.picalculator.gui.graphicengine.Renderer;
+import org.warp.picalculator.math.Function;
+import org.warp.picalculator.math.MathContext;
+import org.warp.picalculator.math.parser.features.FeatureParenthesis;
+import org.warp.picalculator.math.parser.features.interfaces.Feature;
 
 public class BlockParenthesis extends Block {
 
-	public static final int CLASS_ID = 0x00000004;
-
 	private final BlockContainer containerNumber;
 
 	private int chw;
@@ -76,14 +79,15 @@ public class BlockParenthesis extends Block {
 		return containerNumber;
 	}
 
-	@Override
-	public int getClassID() {
-		return CLASS_ID;
-	}
-
 	@Override
 	public int computeCaretMaxBound() {
 		return containerNumber.computeCaretMaxBound();
 	}
 
+	@Override
+	public Feature toFeature(MathContext context) throws Error {
+		final Function cont = getNumberContainer().toFunction(context);
+		return new FeatureParenthesis(cont);
+	}
+
 }

src/main/java/org/warp/picalculator/gui/expression/blocks/BlockPower.java

@@ -1,13 +1,16 @@
 package org.warp.picalculator.gui.expression.blocks;
 
+import org.warp.picalculator.Error;
 import org.warp.picalculator.gui.expression.Caret;
 import org.warp.picalculator.gui.graphicengine.GraphicEngine;
 import org.warp.picalculator.gui.graphicengine.Renderer;
+import org.warp.picalculator.math.Function;
+import org.warp.picalculator.math.MathContext;
+import org.warp.picalculator.math.parser.features.FeaturePower;
+import org.warp.picalculator.math.parser.features.interfaces.Feature;
 
 public class BlockPower extends Block {
 
-	public static final int CLASS_ID = 0x00000005;
-
 	private final BlockContainer containerExponent;
 
 	public BlockPower() {
@@ -67,13 +70,14 @@ public class BlockPower extends Block {
 		return containerExponent;
 	}
 
-	@Override
-	public int getClassID() {
-		return CLASS_ID;
-	}
-
 	@Override
 	public int computeCaretMaxBound() {
 		return containerExponent.computeCaretMaxBound();
 	}
+
+	@Override
+	public Feature toFeature(MathContext context) throws Error {
+		final Function exp = getExponentContainer().toFunction(context);
+		return new FeaturePower(exp);
+	}
 }

src/main/java/org/warp/picalculator/gui/expression/blocks/BlockSquareRoot.java

@@ -1,13 +1,16 @@
 package org.warp.picalculator.gui.expression.blocks;
 
+import org.warp.picalculator.Error;
 import org.warp.picalculator.gui.expression.Caret;
 import org.warp.picalculator.gui.graphicengine.GraphicEngine;
 import org.warp.picalculator.gui.graphicengine.Renderer;
+import org.warp.picalculator.math.Function;
+import org.warp.picalculator.math.MathContext;
+import org.warp.picalculator.math.parser.features.FeatureSquareRoot;
+import org.warp.picalculator.math.parser.features.interfaces.Feature;
 
 public class BlockSquareRoot extends Block {
 
-	public static final int CLASS_ID = 0x00000003;
-
 	private final BlockContainer containerNumber;
 
 	private int h1;
@@ -82,13 +85,14 @@ public class BlockSquareRoot extends Block {
 		return containerNumber;
 	}
 
-	@Override
-	public int getClassID() {
-		return CLASS_ID;
-	}
-
 	@Override
 	public int computeCaretMaxBound() {
 		return containerNumber.computeCaretMaxBound();
 	}
+
+	@Override
+	public Feature toFeature(MathContext context) throws Error {
+		final Function contnt = getNumberContainer().toFunction(context);
+		return new FeatureSquareRoot(contnt);
+	}
 }

src/main/java/org/warp/picalculator/gui/expression/blocks/BlockVariable.java

@@ -1,5 +1,6 @@
 package org.warp.picalculator.gui.expression.blocks;
 
+import org.warp.picalculator.Error;
 import org.warp.picalculator.device.Keyboard.Key;
 import org.warp.picalculator.gui.DisplayManager;
 import org.warp.picalculator.gui.expression.Caret;
@@ -8,12 +9,12 @@ import org.warp.picalculator.gui.expression.InputContext;
 import org.warp.picalculator.gui.graphicengine.BinaryFont;
 import org.warp.picalculator.gui.graphicengine.GraphicEngine;
 import org.warp.picalculator.gui.graphicengine.Renderer;
+import org.warp.picalculator.math.MathContext;
 import org.warp.picalculator.math.functions.Variable.V_TYPE;
+import org.warp.picalculator.math.parser.features.interfaces.Feature;
 
 public class BlockVariable extends Block {
 
-	public static final int CLASS_ID = 0x00000007;
-
 	private InputContext ic;
 	private final char ch;
 	private final VariableMenu menu;
@@ -111,11 +112,6 @@ public class BlockVariable extends Block {
 		return ch;
 	}
 
-	@Override
-	public int getClassID() {
-		return CLASS_ID;
-	}
-
 	@Override
 	public int computeCaretMaxBound() {
 		return 0;
@@ -242,4 +238,10 @@ public class BlockVariable extends Block {
 		}
 		
 	}
+
+	@Override
+	public Feature toFeature(MathContext context) throws Error {
+		// TODO Auto-generated method stub
+		return null;
+	}
 }

src/main/java/org/warp/picalculator/gui/expression/containers/InputContainer.java

@@ -2,6 +2,7 @@ package org.warp.picalculator.gui.expression.containers;
 
 import java.io.Serializable;
 
+import org.warp.picalculator.Error;
 import org.warp.picalculator.device.KeyboardEventListener;
 import org.warp.picalculator.gui.GraphicalElement;
 import org.warp.picalculator.gui.expression.Caret;
@@ -13,6 +14,10 @@ import org.warp.picalculator.gui.expression.blocks.BlockContainer;
 import org.warp.picalculator.gui.expression.layouts.InputLayout;
 import org.warp.picalculator.gui.graphicengine.GraphicEngine;
 import org.warp.picalculator.gui.graphicengine.Renderer;
+import org.warp.picalculator.math.Function;
+import org.warp.picalculator.math.MathContext;
+import org.warp.picalculator.math.parser.MathParser;
+import org.warp.picalculator.math.parser.features.interfaces.Feature;
 
 import it.unimi.dsi.fastutil.objects.ObjectArrayList;
 
@@ -246,5 +251,8 @@ public abstract class InputContainer implements GraphicalElement, InputLayout, S
 	public KeyboardEventListener getExtraKeyboardEventListener() {
 		return extra;
 	}
+	public Function toFunction(MathContext context) throws Error {
+		return root.toFunction(context);
+	}
 
 }

src/main/java/org/warp/picalculator/math/Function.java

@@ -3,6 +3,9 @@ package org.warp.picalculator.math;
 import java.util.List;
 
 import org.warp.picalculator.Error;
+import org.warp.picalculator.gui.expression.blocks.Block;
+
+import it.unimi.dsi.fastutil.objects.ObjectArrayList;
 
 public interface Function {
 
@@ -62,4 +65,12 @@ public interface Function {
 	 * @return boolean
 	 */
 	public boolean isSimplified();
+
+	/**
+	 * 
+	 * @param context Mathematical Context
+	 * @return An ArrayList of parsed Blocks
+	 * @throws Error 
+	 */
+	public ObjectArrayList<Block> toBlock(MathContext context) throws Error;
 }

src/main/java/org/warp/picalculator/math/functions/Division.java

@@ -1,9 +1,14 @@
 package org.warp.picalculator.math.functions;
 
 import org.warp.picalculator.Error;
+import org.warp.picalculator.gui.expression.blocks.Block;
+import org.warp.picalculator.gui.expression.blocks.BlockChar;
+import org.warp.picalculator.gui.expression.blocks.BlockContainer;
+import org.warp.picalculator.gui.expression.blocks.BlockDivision;
 import org.warp.picalculator.math.Function;
 import org.warp.picalculator.math.FunctionOperator;
 import org.warp.picalculator.math.MathContext;
+import org.warp.picalculator.math.MathematicalSymbols;
 import org.warp.picalculator.math.rules.FractionsRule1;
 import org.warp.picalculator.math.rules.FractionsRule11;
 import org.warp.picalculator.math.rules.FractionsRule12;
@@ -96,4 +101,25 @@ public class Division extends FunctionOperator {
 	public String toString() {
 		return "(" + getParameter1() + ")/(" + getParameter2() + ")";
 	}
+
+	@Override
+	public ObjectArrayList<Block> toBlock(MathContext context) throws Error {
+		ObjectArrayList<Block> result = new ObjectArrayList<>();
+		ObjectArrayList<Block> sub1 = getParameter1().toBlock(context);
+		ObjectArrayList<Block> sub2 = getParameter2().toBlock(context);
+		BlockDivision bd = new BlockDivision();
+		BlockContainer uc = bd.getUpperContainer();
+		BlockContainer lc = bd.getLowerContainer();
+		for (Block b : sub1) {
+			uc.appendBlockUnsafe(b);
+		}
+		for (Block b : sub2) {
+			lc.appendBlockUnsafe(b);
+		}
+		uc.recomputeDimensions();
+		lc.recomputeDimensions();
+		bd.recomputeDimensions();
+		result.add(bd);
+		return result;
+	}
 }

src/main/java/org/warp/picalculator/math/functions/EmptyNumber.java

@@ -1,6 +1,7 @@
 package org.warp.picalculator.math.functions;
 
 import org.warp.picalculator.Error;
+import org.warp.picalculator.gui.expression.blocks.Block;
 import org.warp.picalculator.math.Function;
 import org.warp.picalculator.math.MathContext;
 
@@ -50,4 +51,10 @@ public class EmptyNumber implements Function {
 		throw new IndexOutOfBoundsException();
 	}
 
+	@Override
+	public ObjectArrayList<Block> toBlock(MathContext context) {
+		// TODO Auto-generated method stub
+		return null;
+	}
+
 }

src/main/java/org/warp/picalculator/math/functions/Expression.java

@@ -11,6 +11,9 @@ import java.util.regex.Pattern;
 import org.warp.picalculator.Error;
 import org.warp.picalculator.Errors;
 import org.warp.picalculator.Utils;
+import org.warp.picalculator.gui.expression.blocks.Block;
+import org.warp.picalculator.gui.expression.blocks.BlockContainer;
+import org.warp.picalculator.gui.expression.blocks.BlockParenthesis;
 import org.warp.picalculator.math.Function;
 import org.warp.picalculator.math.FunctionDynamic;
 import org.warp.picalculator.math.FunctionOperator;
@@ -624,6 +627,21 @@ public class Expression extends FunctionDynamic {
 		return parenthesisneeded;
 	}
 
+	@Override
+	public ObjectArrayList<Block> toBlock(MathContext context) throws Error {
+		ObjectArrayList<Block> result = new ObjectArrayList<>();
+		ObjectArrayList<Block> sub = getParameter(0).toBlock(context);
+		BlockParenthesis bp = new BlockParenthesis();
+		BlockContainer bpc = bp.getNumberContainer();
+		for (Block b : sub) {
+			bpc.appendBlockUnsafe(b);
+		}
+		bpc.recomputeDimensions();
+		bp.recomputeDimensions();
+		result.add(bp);
+		return result;
+	}
+
 	@Override
 	public String toString() {
 		String s = "(";

src/main/java/org/warp/picalculator/math/functions/Joke.java

@@ -1,6 +1,8 @@
 package org.warp.picalculator.math.functions;
 
 import org.warp.picalculator.Error;
+import org.warp.picalculator.Errors;
+import org.warp.picalculator.gui.expression.blocks.Block;
 import org.warp.picalculator.math.Function;
 import org.warp.picalculator.math.MathContext;
 
@@ -53,4 +55,10 @@ public class Joke implements Function {
 		throw new IndexOutOfBoundsException();
 	}
 
+	@Override
+	public ObjectArrayList<Block> toBlock(MathContext context) throws Error {
+		// TODO Auto-generated method stub
+		throw new Error(Errors.NOT_IMPLEMENTED, "Unknown function " + getClass().getSimpleName());
+	}
+
 }

src/main/java/org/warp/picalculator/math/functions/Multiplication.java

@@ -1,9 +1,12 @@
 package org.warp.picalculator.math.functions;
 
 import org.warp.picalculator.Error;
+import org.warp.picalculator.gui.expression.blocks.Block;
+import org.warp.picalculator.gui.expression.blocks.BlockChar;
 import org.warp.picalculator.math.Function;
 import org.warp.picalculator.math.FunctionOperator;
 import org.warp.picalculator.math.MathContext;
+import org.warp.picalculator.math.MathematicalSymbols;
 import org.warp.picalculator.math.rules.ExponentRule15;
 import org.warp.picalculator.math.rules.ExponentRule16;
 import org.warp.picalculator.math.rules.FractionsRule14;
@@ -106,4 +109,22 @@ public class Multiplication extends FunctionOperator {
 	public String toString() {
 		return "(" + parameter1.toString() + ")*(" + parameter2.toString() + ")";
 	}
+
+	@Override
+	public ObjectArrayList<Block> toBlock(MathContext context) throws Error {
+		ObjectArrayList<Block> result = new ObjectArrayList<>();
+		ObjectArrayList<Block> sub1 = getParameter1().toBlock(context);
+		ObjectArrayList<Block> sub2 = getParameter2().toBlock(context);
+		Block nearLeft = sub1.get(sub1.size()-1);
+		Block nearRight = sub2.get(0);
+		
+		result.addAll(sub1);
+		if (nearLeft instanceof BlockChar && nearRight instanceof BlockChar) {
+			
+		} else {
+			result.add(new BlockChar(MathematicalSymbols.MULTIPLICATION));
+		}
+		result.addAll(sub2);
+		return result;
+	}
 }

src/main/java/org/warp/picalculator/math/functions/Negative.java

@@ -2,6 +2,7 @@ package org.warp.picalculator.math.functions;
 
 import org.warp.picalculator.Error;
 import org.warp.picalculator.Errors;
+import org.warp.picalculator.gui.expression.blocks.Block;
 import org.warp.picalculator.math.Function;
 import org.warp.picalculator.math.FunctionSingle;
 import org.warp.picalculator.math.MathContext;
@@ -78,4 +79,10 @@ public class Negative extends FunctionSingle {
 	public Negative clone() {
 		return new Negative(mathContext, parameter);
 	}
+	
+	@Override
+	public ObjectArrayList<Block> toBlock(MathContext context) throws Error {
+		// TODO Auto-generated method stub
+		throw new Error(Errors.NOT_IMPLEMENTED, "Unknown function " + getClass().getSimpleName());
+	}
 }

src/main/java/org/warp/picalculator/math/functions/Number.java

@@ -8,6 +8,11 @@ import java.util.List;
 import org.nevec.rjm.BigDecimalMath;
 import org.warp.picalculator.Error;
 import org.warp.picalculator.Utils;
+import org.warp.picalculator.gui.expression.blocks.Block;
+import org.warp.picalculator.gui.expression.blocks.BlockChar;
+import org.warp.picalculator.gui.expression.blocks.BlockContainer;
+import org.warp.picalculator.gui.expression.blocks.BlockExponentialNotation;
+import org.warp.picalculator.gui.expression.blocks.BlockPower;
 import org.warp.picalculator.math.Function;
 import org.warp.picalculator.math.MathContext;
 
@@ -220,6 +225,32 @@ public class Number implements Function {
 		return fs;
 	}
 
+	@Override
+	public ObjectArrayList<Block> toBlock(MathContext context) {
+		ObjectArrayList<Block> result = new ObjectArrayList<>();
+		String numberString = this.toString();
+		if (numberString.contains("ℯ℮")) {
+			String[] numberParts = numberString.split("ℯ℮", 2);
+			BlockPower bp = new BlockExponentialNotation();
+			BlockContainer bpec = bp.getExponentContainer();
+			for (char c : numberParts[0].toCharArray()) {
+				result.add(new BlockChar(c));
+			}
+			for (char c : numberParts[1].toCharArray()) {
+				bpec.appendBlockUnsafe(new BlockChar(c));
+			};
+			bpec.recomputeDimensions();
+			bp.recomputeDimensions();
+			result.add(bp);
+			return result;
+		} else {
+			for (char c : numberString.toCharArray()) {
+				result.add(new BlockChar(c));
+			}
+		}
+		return result;
+	}
+
 	@Override
 	public Function setParameter(int index, Function var) throws IndexOutOfBoundsException {
 		throw new IndexOutOfBoundsException();

src/main/java/org/warp/picalculator/math/functions/Power.java

@@ -1,6 +1,9 @@
 package org.warp.picalculator.math.functions;
 
 import org.warp.picalculator.Error;
+import org.warp.picalculator.gui.expression.blocks.Block;
+import org.warp.picalculator.gui.expression.blocks.BlockContainer;
+import org.warp.picalculator.gui.expression.blocks.BlockPower;
 import org.warp.picalculator.math.Function;
 import org.warp.picalculator.math.FunctionOperator;
 import org.warp.picalculator.math.MathContext;
@@ -91,4 +94,21 @@ public class Power extends FunctionOperator {
 	public Power clone() {
 		return new Power(mathContext, parameter1, parameter2);
 	}
+
+	@Override
+	public ObjectArrayList<Block> toBlock(MathContext context) throws Error {
+		ObjectArrayList<Block> result = new ObjectArrayList<>();
+		ObjectArrayList<Block> sub1 = getParameter1().toBlock(context);
+		ObjectArrayList<Block> sub2 = getParameter2().toBlock(context);
+		BlockPower bp = new BlockPower();
+		BlockContainer ec = bp.getExponentContainer();
+		result.addAll(sub1);
+		for (Block b : sub2) {
+			ec.appendBlockUnsafe(b);
+		}
+		ec.recomputeDimensions();
+		bp.recomputeDimensions();
+		result.add(bp);
+		return result;
+	}
 }

src/main/java/org/warp/picalculator/math/functions/Root.java

@@ -4,6 +4,8 @@ import java.math.BigDecimal;
 import java.math.BigInteger;
 
 import org.warp.picalculator.Error;
+import org.warp.picalculator.Errors;
+import org.warp.picalculator.gui.expression.blocks.Block;
 import org.warp.picalculator.math.Function;
 import org.warp.picalculator.math.FunctionOperator;
 import org.warp.picalculator.math.MathContext;
@@ -73,5 +75,11 @@ public class Root extends FunctionOperator {
 	public Root clone() {
 		return new Root(mathContext, parameter1, parameter2);
 	}
+	
+	@Override
+	public ObjectArrayList<Block> toBlock(MathContext context) throws Error {
+		// TODO Auto-generated method stub
+		throw new Error(Errors.NOT_IMPLEMENTED, "Unknown function " + getClass().getSimpleName());
+	}
 
 }

src/main/java/org/warp/picalculator/math/functions/RootSquare.java

@@ -3,6 +3,9 @@ package org.warp.picalculator.math.functions;
 import java.math.BigInteger;
 
 import org.warp.picalculator.Error;
+import org.warp.picalculator.gui.expression.blocks.Block;
+import org.warp.picalculator.gui.expression.blocks.BlockContainer;
+import org.warp.picalculator.gui.expression.blocks.BlockSquareRoot;
 import org.warp.picalculator.math.Function;
 import org.warp.picalculator.math.FunctionSingle;
 import org.warp.picalculator.math.MathContext;
@@ -64,4 +67,18 @@ public class RootSquare extends FunctionSingle {
 	public RootSquare clone() {
 		return new RootSquare(mathContext, parameter);
 	}
+
+	@Override
+	public ObjectArrayList<Block> toBlock(MathContext context) throws Error {
+		ObjectArrayList<Block> result = new ObjectArrayList<>();
+		BlockSquareRoot bsqr = new BlockSquareRoot();
+		BlockContainer bsqrc = bsqr.getNumberContainer();
+		for (Block b : getParameter().toBlock(context)) {
+			bsqrc.appendBlockUnsafe(b);
+		}
+		bsqrc.recomputeDimensions();
+		bsqr.recomputeDimensions();
+		result.add((bsqr));
+		return result;
+	}
 }

src/main/java/org/warp/picalculator/math/functions/Subtraction.java

@@ -1,9 +1,12 @@
 package org.warp.picalculator.math.functions;
 
 import org.warp.picalculator.Error;
+import org.warp.picalculator.gui.expression.blocks.Block;
+import org.warp.picalculator.gui.expression.blocks.BlockChar;
 import org.warp.picalculator.math.Function;
 import org.warp.picalculator.math.FunctionOperator;
 import org.warp.picalculator.math.MathContext;
+import org.warp.picalculator.math.MathematicalSymbols;
 import org.warp.picalculator.math.rules.ExpandRule1;
 import org.warp.picalculator.math.rules.ExpandRule5;
 import org.warp.picalculator.math.rules.NumberRule3;
@@ -92,4 +95,13 @@ public class Subtraction extends FunctionOperator {
 		return new Subtraction(mathContext, parameter1, parameter2);
 	}
 
+	@Override
+	public ObjectArrayList<Block> toBlock(MathContext context) throws Error {
+		ObjectArrayList<Block> result = new ObjectArrayList<>();
+		result.addAll(getParameter1().toBlock(context));
+		result.add(new BlockChar(MathematicalSymbols.SUBTRACTION));
+		result.addAll(getParameter2().toBlock(context));
+		return result;
+	}
+
 }

src/main/java/org/warp/picalculator/math/functions/Sum.java

@@ -4,9 +4,12 @@ import java.math.BigDecimal;
 
 import org.warp.picalculator.Error;
 import org.warp.picalculator.Errors;
+import org.warp.picalculator.gui.expression.blocks.Block;
+import org.warp.picalculator.gui.expression.blocks.BlockChar;
 import org.warp.picalculator.math.Function;
 import org.warp.picalculator.math.FunctionOperator;
 import org.warp.picalculator.math.MathContext;
+import org.warp.picalculator.math.MathematicalSymbols;
 import org.warp.picalculator.math.rules.NumberRule3;
 import org.warp.picalculator.math.rules.NumberRule5;
 import org.warp.picalculator.math.rules.NumberRule7;
@@ -114,4 +117,13 @@ public class Sum extends FunctionOperator {
 		return new Sum(mathContext, parameter1, parameter2);
 	}
 
+	@Override
+	public ObjectArrayList<Block> toBlock(MathContext context) throws Error {
+		ObjectArrayList<Block> result = new ObjectArrayList<>();
+		result.addAll(getParameter1().toBlock(context));
+		result.add(new BlockChar(MathematicalSymbols.SUM));
+		result.addAll(getParameter2().toBlock(context));
+		return result;
+	}
+
 }

src/main/java/org/warp/picalculator/math/functions/SumSubtraction.java

@@ -2,9 +2,12 @@ package org.warp.picalculator.math.functions;
 
 import org.warp.picalculator.Error;
 import org.warp.picalculator.Errors;
+import org.warp.picalculator.gui.expression.blocks.Block;
+import org.warp.picalculator.gui.expression.blocks.BlockChar;
 import org.warp.picalculator.math.Function;
 import org.warp.picalculator.math.FunctionOperator;
 import org.warp.picalculator.math.MathContext;
+import org.warp.picalculator.math.MathematicalSymbols;
 import org.warp.picalculator.math.rules.ExpandRule1;
 import org.warp.picalculator.math.rules.NumberRule3;
 import org.warp.picalculator.math.rules.NumberRule4;
@@ -73,4 +76,13 @@ public class SumSubtraction extends FunctionOperator {
 		return new SumSubtraction(mathContext, parameter1, parameter2);
 	}
 
+	@Override
+	public ObjectArrayList<Block> toBlock(MathContext context) throws Error {
+		ObjectArrayList<Block> result = new ObjectArrayList<>();
+		result.addAll(getParameter1().toBlock(context));
+		result.add(new BlockChar(MathematicalSymbols.SUM_SUBTRACTION));
+		result.addAll(getParameter2().toBlock(context));
+		return result;
+	}
+
 }

src/main/java/org/warp/picalculator/math/functions/Undefined.java

@@ -3,9 +3,13 @@ package org.warp.picalculator.math.functions;
 import java.util.List;
 
 import org.warp.picalculator.Error;
+import org.warp.picalculator.Errors;
+import org.warp.picalculator.gui.expression.blocks.Block;
 import org.warp.picalculator.math.Function;
 import org.warp.picalculator.math.MathContext;
 
+import it.unimi.dsi.fastutil.objects.ObjectArrayList;
+
 public class Undefined implements Function {
 
 	protected final MathContext root;
@@ -52,4 +56,10 @@ public class Undefined implements Function {
 		throw new IndexOutOfBoundsException();
 	}
 
+	@Override
+	public ObjectArrayList<Block> toBlock(MathContext context) throws Error {
+		// TODO Auto-generated method stub
+		throw new Error(Errors.NOT_IMPLEMENTED, "Unknown function " + getClass().getSimpleName());
+	}
+
 }

src/main/java/org/warp/picalculator/math/functions/Variable.java

@@ -3,6 +3,8 @@ package org.warp.picalculator.math.functions;
 import java.util.List;
 
 import org.warp.picalculator.Error;
+import org.warp.picalculator.gui.expression.blocks.Block;
+import org.warp.picalculator.gui.expression.blocks.BlockChar;
 import org.warp.picalculator.math.Function;
 import org.warp.picalculator.math.MathContext;
 
@@ -103,4 +105,12 @@ public class Variable implements Function {
 	public Function getParameter(int index) throws IndexOutOfBoundsException {
 		throw new IndexOutOfBoundsException();
 	}
+
+	@Override
+	public ObjectArrayList<Block> toBlock(MathContext context) {
+		ObjectArrayList<Block> result = new ObjectArrayList<>();
+		//TODO: Temporary solution. In near future Variables will be distint objects and they will have a color. So they will be no longer a BlockChar/FeatureChar
+		result.add(new BlockChar(getChar()));
+		return result;
+	}
 }

src/main/java/org/warp/picalculator/math/functions/equations/Equation.java

@@ -7,6 +7,7 @@ import java.util.Set;
 
 import org.warp.picalculator.Error;
 import org.warp.picalculator.Errors;
+import org.warp.picalculator.gui.expression.blocks.Block;
 import org.warp.picalculator.math.Function;
 import org.warp.picalculator.math.FunctionOperator;
 import org.warp.picalculator.math.MathContext;
@@ -88,4 +89,10 @@ public class Equation extends FunctionOperator {
 		return false;
 	}
 
+	@Override
+	public ObjectArrayList<Block> toBlock(MathContext context) throws Error {
+		// TODO Auto-generated method stub
+		return null;
+	}
+
 }

src/main/java/org/warp/picalculator/math/functions/equations/EquationsSystem.java

@@ -3,6 +3,7 @@ package org.warp.picalculator.math.functions.equations;
 import java.util.List;
 
 import org.warp.picalculator.Error;
+import org.warp.picalculator.gui.expression.blocks.Block;
 import org.warp.picalculator.math.Function;
 import org.warp.picalculator.math.FunctionDynamic;
 import org.warp.picalculator.math.MathContext;
@@ -70,4 +71,10 @@ public class EquationsSystem extends FunctionDynamic {
 		return new EquationsSystem(root, functions);
 	}
 
+	@Override
+	public ObjectArrayList<Block> toBlock(MathContext context) throws Error {
+		// TODO Auto-generated method stub
+		return null;
+	}
+
 }

src/main/java/org/warp/picalculator/math/functions/equations/EquationsSystemPart.java

@@ -1,6 +1,7 @@
 package org.warp.picalculator.math.functions.equations;
 
 import org.warp.picalculator.Error;
+import org.warp.picalculator.gui.expression.blocks.Block;
 import org.warp.picalculator.math.Function;
 import org.warp.picalculator.math.FunctionSingle;
 import org.warp.picalculator.math.MathContext;
@@ -36,4 +37,10 @@ public class EquationsSystemPart extends FunctionSingle {
 		return new EquationsSystemPart(mathContext, (Equation) parameter);
 	}
 
+	@Override
+	public ObjectArrayList<Block> toBlock(MathContext context) throws Error {
+		// TODO Auto-generated method stub
+		return null;
+	}
+
 }

src/main/java/org/warp/picalculator/math/functions/trigonometry/ArcCosine.java

@@ -1,6 +1,8 @@
 package org.warp.picalculator.math.functions.trigonometry;
 
 import org.warp.picalculator.Error;
+import org.warp.picalculator.Errors;
+import org.warp.picalculator.gui.expression.blocks.Block;
 import org.warp.picalculator.math.Function;
 import org.warp.picalculator.math.FunctionSingle;
 import org.warp.picalculator.math.MathContext;
@@ -37,4 +39,10 @@ public class ArcCosine extends FunctionSingle {
 		return null;
 	}
 
+	@Override
+	public ObjectArrayList<Block> toBlock(MathContext context) throws Error {
+		// TODO Auto-generated method stub
+		throw new Error(Errors.NOT_IMPLEMENTED, "Unknown function " + getClass().getSimpleName());
+	}
+
 }

src/main/java/org/warp/picalculator/math/functions/trigonometry/ArcSine.java

@@ -1,6 +1,8 @@
 package org.warp.picalculator.math.functions.trigonometry;
 
 import org.warp.picalculator.Error;
+import org.warp.picalculator.Errors;
+import org.warp.picalculator.gui.expression.blocks.Block;
 import org.warp.picalculator.math.Function;
 import org.warp.picalculator.math.FunctionSingle;
 import org.warp.picalculator.math.MathContext;
@@ -37,4 +39,10 @@ public class ArcSine extends FunctionSingle {
 		return null;
 	}
 
+	@Override
+	public ObjectArrayList<Block> toBlock(MathContext context) throws Error {
+		// TODO Auto-generated method stub
+		throw new Error(Errors.NOT_IMPLEMENTED, "Unknown function " + getClass().getSimpleName());
+	}
+
 }

src/main/java/org/warp/picalculator/math/functions/trigonometry/ArcTangent.java

@@ -1,6 +1,8 @@
 package org.warp.picalculator.math.functions.trigonometry;
 
 import org.warp.picalculator.Error;
+import org.warp.picalculator.Errors;
+import org.warp.picalculator.gui.expression.blocks.Block;
 import org.warp.picalculator.math.Function;
 import org.warp.picalculator.math.FunctionSingle;
 import org.warp.picalculator.math.MathContext;
@@ -37,4 +39,10 @@ public class ArcTangent extends FunctionSingle {
 		return null;
 	}
 
+	@Override
+	public ObjectArrayList<Block> toBlock(MathContext context) throws Error {
+		// TODO Auto-generated method stub
+		throw new Error(Errors.NOT_IMPLEMENTED, "Unknown function " + getClass().getSimpleName());
+	}
+
 }

src/main/java/org/warp/picalculator/math/functions/trigonometry/Cosine.java

@@ -1,6 +1,8 @@
 package org.warp.picalculator.math.functions.trigonometry;
 
 import org.warp.picalculator.Error;
+import org.warp.picalculator.Errors;
+import org.warp.picalculator.gui.expression.blocks.Block;
 import org.warp.picalculator.math.Function;
 import org.warp.picalculator.math.FunctionSingle;
 import org.warp.picalculator.math.MathContext;
@@ -37,4 +39,10 @@ public class Cosine extends FunctionSingle {
 		return null;
 	}
 
+	@Override
+	public ObjectArrayList<Block> toBlock(MathContext context) throws Error {
+		// TODO Auto-generated method stub
+		throw new Error(Errors.NOT_IMPLEMENTED, "Unknown function " + getClass().getSimpleName());
+	}
+
 }

src/main/java/org/warp/picalculator/math/functions/trigonometry/Sine.java

@@ -2,6 +2,7 @@ package org.warp.picalculator.math.functions.trigonometry;
 
 import org.nevec.rjm.BigDecimalMath;
 import org.warp.picalculator.Error;
+import org.warp.picalculator.gui.expression.blocks.Block;
 import org.warp.picalculator.math.AngleMode;
 import org.warp.picalculator.math.Function;
 import org.warp.picalculator.math.FunctionSingle;
@@ -57,4 +58,10 @@ public class Sine extends FunctionSingle {
 		return new Sine(mathContext, parameter);
 	}
 
+	@Override
+	public ObjectArrayList<Block> toBlock(MathContext context) throws Error {
+		// TODO Auto-generated method stub
+		return null;
+	}
+
 }

src/main/java/org/warp/picalculator/math/functions/trigonometry/Tangent.java

@@ -1,6 +1,7 @@
 package org.warp.picalculator.math.functions.trigonometry;
 
 import org.warp.picalculator.Error;
+import org.warp.picalculator.gui.expression.blocks.Block;
 import org.warp.picalculator.math.Function;
 import org.warp.picalculator.math.FunctionSingle;
 import org.warp.picalculator.math.MathContext;
@@ -37,4 +38,10 @@ public class Tangent extends FunctionSingle {
 		return null;
 	}
 
+	@Override
+	public ObjectArrayList<Block> toBlock(MathContext context) throws Error {
+		// TODO Auto-generated method stub
+		return null;
+	}
+
 }

src/main/java/org/warp/picalculator/math/parser/MathParser.java

@@ -49,7 +49,7 @@ public class MathParser {
 	public static Expression parseInput(MathContext context, InputContainer c) throws Error {
 		Expression result;
 
-		final Function resultFunction = parseContainer(context, c.getContent());
+		final Function resultFunction = c.toFunction(context);
 
 		result = new Expression(context, resultFunction);
 		return result;
@@ -59,186 +59,15 @@ public class MathParser {
 		final ObjectArrayList<Block> resultBlocks = new ObjectArrayList<>();
 		
 		for (Function f : expr) {
-			resultBlocks.addAll(parseFunction(context, f));
+			ObjectArrayList<Block> resultPart = f.toBlock(context);
+			if (resultPart == null) throw new Error(Errors.NOT_IMPLEMENTED, "Unknown function " + f.getClass().getSimpleName());
+			resultBlocks.addAll(resultPart);
 		}
 		
 		return resultBlocks;
 	}
-	
-	private static ObjectArrayList<Block> parseFunction(MathContext context, Function func) throws Error {
-		ObjectArrayList<Block> result = new ObjectArrayList<>();
-		if (func instanceof FunctionOperator) {
-			ObjectArrayList<Block> sub1 = parseFunction(context, func.getParameter(0));
-			ObjectArrayList<Block> sub2 = parseFunction(context, func.getParameter(1));
-			if (func instanceof Sum) {
-				result.addAll(sub1);
-				result.add(new BlockChar(MathematicalSymbols.SUM));
-				result.addAll(sub2);
-				return result;
-			}
-			if (func instanceof Subtraction) {
-				result.addAll(sub1);
-				result.add(new BlockChar(MathematicalSymbols.SUBTRACTION));
-				result.addAll(sub2);
-				return result;
-			}
-			if (func instanceof SumSubtraction) {
-				result.addAll(sub1);
-				result.add(new BlockChar(MathematicalSymbols.SUM_SUBTRACTION));
-				result.addAll(sub2);
-				return result;
-			}
-			if (func instanceof Multiplication) {
-				Block nearLeft = sub1.get(sub1.size()-1);
-				Block nearRight = sub2.get(0);
-				
-				result.addAll(sub1);
-				if (nearLeft instanceof BlockChar && nearRight instanceof BlockChar) {
-					
-				} else {
-					result.add(new BlockChar(MathematicalSymbols.MULTIPLICATION));
-				}
-				result.addAll(sub2);
-				return result;
-			}
-			if (func instanceof Division) {
-				BlockDivision bd = new BlockDivision();
-				BlockContainer uc = bd.getUpperContainer();
-				BlockContainer lc = bd.getLowerContainer();
-				for (Block b : sub1) {
-					uc.appendBlockUnsafe(b);
-				}
-				for (Block b : sub2) {
-					lc.appendBlockUnsafe(b);
-				}
-				uc.recomputeDimensions();
-				lc.recomputeDimensions();
-				bd.recomputeDimensions();
-				result.add(bd);
-				return result;
-			}
-			if (func instanceof Power) {
-				BlockPower bp = new BlockPower();
-				BlockContainer ec = bp.getExponentContainer();
-				result.addAll(sub1);
-				for (Block b : sub2) {
-					ec.appendBlockUnsafe(b);
-				}
-				ec.recomputeDimensions();
-				bp.recomputeDimensions();
-				result.add(bp);
-				return result;
-			}
-		}
-		if (func instanceof FunctionSingle) {
-			ObjectArrayList<Block> sub = parseFunction(context, func.getParameter(0));
-			if (func instanceof RootSquare) {
-				BlockSquareRoot bsqr = new BlockSquareRoot();
-				BlockContainer bsqrc = bsqr.getNumberContainer();
-				for (Block b : sub) {
-					bsqrc.appendBlockUnsafe(b);
-				}
-				bsqrc.recomputeDimensions();
-				bsqr.recomputeDimensions();
-				result.add((bsqr));
-				return result;
-			}
-			
-		}
-		if (func instanceof Expression) {
-			ObjectArrayList<Block> sub = parseFunction(context, ((Expression) func).getParameter(0));
-			BlockParenthesis bp = new BlockParenthesis();
-			BlockContainer bpc = bp.getNumberContainer();
-			for (Block b : sub) {
-				bpc.appendBlockUnsafe(b);
-			}
-			bpc.recomputeDimensions();
-			bp.recomputeDimensions();
-			result.add(bp);
-			return result;
-		}
-		if (func instanceof Number) {
-			Number numb = (Number) func;
-			String numberString = numb.toString();
-			if (numberString.contains("ℯ℮")) {
-				String[] numberParts = numberString.split("ℯ℮", 2);
-				BlockPower bp = new BlockExponentialNotation();
-				BlockContainer bpec = bp.getExponentContainer();
-				for (char c : numberParts[0].toCharArray()) {
-					result.add(new BlockChar(c));
-				}
-				for (char c : numberParts[1].toCharArray()) {
-					bpec.appendBlockUnsafe(new BlockChar(c));
-				};
-				bpec.recomputeDimensions();
-				bp.recomputeDimensions();
-				result.add(bp);
-				return result;
-			} else {
-				for (char c : numberString.toCharArray()) {
-					result.add(new BlockChar(c));
-				}
-			}
-			return result;
-		}
-		if (func instanceof Variable) {
-			//TODO: Temporary solution. In near future Variables will be distint objects and they will have a color. So they will be no longer a BlockChar/FeatureChar
-			result.add(new BlockChar(((Variable) func).getChar()));
-			return result;
-		}
-		throw new Error(Errors.NOT_IMPLEMENTED, "Unknown function " + func.getClass().getSimpleName());
-	}
 
-	private static Function parseContainer(final MathContext context, final Iterable<Block> blocks) throws Error {
-		final ObjectArrayList<Feature> blockFeatures = new ObjectArrayList<>();
-
-		for (final Block block : blocks) {
-			final Feature blockFeature = parseBlock(context, block);
-			blockFeatures.add(blockFeature);
-		}
-
-		final Function result = joinFeatures(context, blockFeatures);
-		return result;
-	}
-
-	private static Feature parseBlock(final MathContext context, final Block block) throws Error {
-
-		Feature result;
-
-		final int blockType = block.getClassID();
-		switch (blockType) {
-			case BlockChar.CLASS_ID:
-				result = new FeatureChar(((BlockChar) block).getChar());
-				break;
-			case BlockDivision.CLASS_ID:
-				final BlockDivision bd = (BlockDivision) block;
-				final Function upper = parseContainer(context, bd.getUpperContainer().getContent());
-				final Function lower = parseContainer(context, bd.getLowerContainer().getContent());
-				result = new FeatureDivision(upper, lower);
-				break;
-			case BlockSquareRoot.CLASS_ID:
-				final BlockSquareRoot bsqr = (BlockSquareRoot) block;
-				final Function contnt = parseContainer(context, bsqr.getNumberContainer().getContent());
-				result = new FeatureSquareRoot(contnt);
-				break;
-			case BlockParenthesis.CLASS_ID:
-				final BlockParenthesis bp = (BlockParenthesis) block;
-				final Function cont = parseContainer(context, bp.getNumberContainer().getContent());
-				result = new FeatureParenthesis(cont);
-				break;
-			case BlockPower.CLASS_ID:
-				final BlockPower blp = (BlockPower) block;
-				final Function exp = parseContainer(context, blp.getExponentContainer().getContent());
-				result = new FeaturePower(exp);
-				break;
-			default:
-				throw new Error(Errors.NOT_IMPLEMENTED, "The block " + block.getClass().getSimpleName() + " isn't a known BLock");
-		}
-
-		return result;
-	}
-
-	private static Function joinFeatures(final MathContext context, ObjectArrayList<Feature> features) throws Error {
+	public static Function joinFeatures(final MathContext context, ObjectArrayList<Feature> features) throws Error {
 
 		features = fixFeatures(context, features);