Added new expression blocks, like parentheses and power of x

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

@@ -11,29 +11,34 @@ public class BlockContainer implements GraphicalElement {
 
 	private static boolean initialized = false;
 
-	private final int minWidth;
-	private final int minHeight;
+	private int minWidth;
+	private int minHeight;
 	private final ObjectArrayList<Block> content;
 	private boolean small;
 	private int width;
 	private int height;
 	private int line;
 	public final boolean withBorder;
+	private boolean autoMinimums;
 
 	public BlockContainer() {
 		this(false, BlockContainer.getDefaultCharWidth(false), BlockContainer.getDefaultCharHeight(false), true);
+		autoMinimums = true;
 	}
 
 	public BlockContainer(boolean small) {
 		this(small, BlockContainer.getDefaultCharWidth(small), BlockContainer.getDefaultCharHeight(small), true);
+		autoMinimums = true;
 	}
 
 	public BlockContainer(boolean small, boolean withBorder) {
 		this(small, BlockContainer.getDefaultCharWidth(small), BlockContainer.getDefaultCharHeight(small), withBorder);
+		autoMinimums = true;
 	}
 
 	public BlockContainer(boolean small, int minWidth, int minHeight, boolean withBorder) {
 		this(small, minWidth, minHeight, new ObjectArrayList<>(), withBorder);
+		autoMinimums = false;
 	}
 
 	public BlockContainer(boolean small, int minWidth, int minHeight, ObjectArrayList<Block> content, boolean withBorder) {
@@ -111,9 +116,9 @@ public class BlockContainer implements GraphicalElement {
 
 		if (caret.getRemaining() == 0) {
 			if (content.size() > 0) {
-				BlockContainer.drawCaret(ge, r, caret, x, y + line - content.get(0).line, content.get(0).height);
+				BlockContainer.drawCaret(ge, r, caret, small, x, y + line - content.get(0).line, content.get(0).height);
 			} else {
-				BlockContainer.drawCaret(ge, r, caret, x, y, height);
+				BlockContainer.drawCaret(ge, r, caret, small, x, y, height);
 			}
 		}
 
@@ -128,7 +133,7 @@ public class BlockContainer implements GraphicalElement {
 				b.draw(ge, r, x + paddingX, y + line - b.line, caret);
 				paddingX += b.getWidth();
 				if (caret.getRemaining() == 0) {
-					BlockContainer.drawCaret(ge, r, caret, x + paddingX, y + line - b.line, b.height);
+					BlockContainer.drawCaret(ge, r, caret, small, x + paddingX, y + line - b.line, b.height);
 				}
 				paddingX += 1;
 			}
@@ -271,17 +276,22 @@ public class BlockContainer implements GraphicalElement {
 		return defFontSizes[b ? 3 : 1];
 	}
 
-	public static void drawCaret(GraphicEngine ge, Renderer r, Caret caret, int x, int y, int height) {
+	public static void drawCaret(GraphicEngine ge, Renderer r, Caret caret, boolean small, int x, int y, int height) {
 		if (caret.getState() == CaretState.VISIBLE_ON) {
 			r.glColor(getDefaultColor());
-			r.glDrawLine(x, y, x, y - 1 + height);
-			r.glDrawLine(x + 1, y, x + 1, y - 1 + height);
-			r.glDrawLine(x + 2, y, x + 2, y - 1 + height);
+			r.glFillColor(x, y, small?2:3, height);
 		}
 	}
 
 	public void setSmall(boolean small) {
 		this.small = small;
+		if (this.autoMinimums) {
+			this.minWidth = BlockContainer.getDefaultCharWidth(small);
+			this.minHeight = BlockContainer.getDefaultCharHeight(small);
+		}
+		for (Block b : this.content) {
+			b.setSmall(small);
+		}
 		recomputeDimensions();
 	}
 

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

@@ -0,0 +1,8 @@
+package org.warp.picalculator.gui.expression;
+
+public class BlockExponentialNotation extends BlockPower {
+	@Override
+	protected int getSpacing() {
+		return -3;
+	}
+}

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

@@ -1,5 +1,6 @@
 package org.warp.picalculator.gui.expression;
 
+import org.warp.picalculator.gui.graphicengine.BinaryFont;
 import org.warp.picalculator.gui.graphicengine.GraphicEngine;
 import org.warp.picalculator.gui.graphicengine.Renderer;
 
@@ -9,6 +10,9 @@ public class BlockParenthesis extends Block {
 
 	private final BlockContainer containerNumber;
 
+	private int chw;
+	private int chh;
+
 	public BlockParenthesis() {
 		containerNumber = new BlockContainer(false);
 		recomputeDimensions();
@@ -18,7 +22,13 @@ public class BlockParenthesis extends Block {
 	public void draw(GraphicEngine ge, Renderer r, int x, int y, Caret caret) {
 		BlockContainer.getDefaultFont(small).use(ge);
 		r.glColor(BlockContainer.getDefaultColor());
-		containerNumber.draw(ge, r, x + 7, y + 3, caret);
+		r.glDrawCharLeft(x, y, '╭');
+		r.glDrawCharLeft(x, y+height-chh, '╰');
+		r.glFillColor(x+3, y+6, 2, height-6*2);
+		r.glFillColor(x+width-5, y+6, 2, height-6*2);
+		r.glDrawCharLeft(x+width-chw, y, '╮');
+		r.glDrawCharLeft(x+width-chw, y+height-chh, '╯');
+		containerNumber.draw(ge, r, x+chw, y, caret);
 	}
 
 	@Override
@@ -43,7 +53,9 @@ public class BlockParenthesis extends Block {
 
 	@Override
 	public void recomputeDimensions() {
-		width = containerNumber.getWidth() + BlockContainer.getDefaultCharWidth(small) * 2;
+		chw = BlockContainer.getDefaultCharWidth(small);
+		chh = BlockContainer.getDefaultCharHeight(small);
+		width = containerNumber.getWidth() + chw * 2 + 3;
 		height = containerNumber.getHeight();
 		line = containerNumber.getLine();
 	}

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

@@ -0,0 +1,97 @@
+package org.warp.picalculator.gui.expression;
+
+import org.warp.picalculator.gui.expression.Block;
+import org.warp.picalculator.gui.expression.BlockContainer;
+import org.warp.picalculator.gui.expression.Caret;
+import org.warp.picalculator.gui.graphicengine.GraphicEngine;
+import org.warp.picalculator.gui.graphicengine.Renderer;
+
+public class BlockPower extends Block {
+
+	public static final int CLASS_ID = 0x00000005;
+
+	private final BlockContainer containerNumber;
+	private final BlockContainer containerExponent;
+
+	private int h1;
+	private int w1;
+
+	public BlockPower() {
+		containerNumber = new BlockContainer(false);
+		containerExponent = new BlockContainer(true);
+		recomputeDimensions();
+	}
+
+	@Override
+	public void draw(GraphicEngine ge, Renderer r, int x, int y, Caret caret) {
+		BlockContainer.getDefaultFont(small).use(ge);
+		r.glColor(BlockContainer.getDefaultColor());
+		containerNumber.draw(ge, r, x, y+height-h1, caret);
+		BlockContainer.getDefaultFont(true).use(ge);
+		containerExponent.draw(ge, r, x+w1+getSpacing(), y, caret);
+	}
+
+	@Override
+	public boolean putBlock(Caret caret, Block newBlock) {
+		boolean added = false;
+		added = added | containerNumber.putBlock(caret, newBlock);
+		added = added | containerExponent.putBlock(caret, newBlock);
+		if (added) {
+			recomputeDimensions();
+		}
+		return added;
+	}
+
+	@Override
+	public boolean delBlock(Caret caret) {
+		boolean removed = false;
+		removed = removed | containerNumber.delBlock(caret);
+		removed = removed | containerExponent.delBlock(caret);
+		if (removed) {
+			recomputeDimensions();
+		}
+		return removed;
+	}
+
+	@Override
+	public void recomputeDimensions() {
+		w1 = containerNumber.getWidth();
+		final int w2 = containerExponent.getWidth();
+		h1 = containerNumber.getHeight();
+		final int h2 = containerExponent.getHeight();
+		final int l1 = containerNumber.getLine();
+		width = w1+getSpacing()+1+w2;
+		height = h1 + h2 - 3;
+		line = height-h1+l1;
+	}
+
+	@Override
+	public void setSmall(boolean small) {
+		this.small = small;
+		containerNumber.setSmall(small);
+		containerExponent.setSmall(true);
+		recomputeDimensions();
+	}
+
+	public BlockContainer getNumberContainer() {
+		return containerNumber;
+	}
+
+	public BlockContainer getExponentContainer() {
+		return containerExponent;
+	}
+
+	@Override
+	public int getClassID() {
+		return CLASS_ID;
+	}
+
+	@Override
+	public int computeCaretMaxBound() {
+		return containerNumber.computeCaretMaxBound() + containerExponent.computeCaretMaxBound();
+	}
+	
+	protected int getSpacing() {
+		return 1;
+	}
+}

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

@@ -74,6 +74,8 @@ public abstract class InputContainer implements GraphicalElement, InputLayout, S
 		final int curPos = caret.getPosition();
 		if (curPos > 0) {
 			caret.setPosition(curPos - 1);
+		} else {
+			caret.setPosition(maxPosition-1);
 		}
 		caret.turnOn();
 		caretTime = 0;
@@ -83,6 +85,8 @@ public abstract class InputContainer implements GraphicalElement, InputLayout, S
 		final int curPos = caret.getPosition();
 		if (curPos + 1 < maxPosition) {
 			caret.setPosition(curPos + 1);
+		} else {
+			caret.setPosition(0);
 		}
 		caret.turnOn();
 		caretTime = 0;

src/org/warp/picalculator/gui/expression/containers/NormalInputContainer.java

@@ -4,6 +4,7 @@ import org.warp.picalculator.gui.expression.Block;
 import org.warp.picalculator.gui.expression.BlockChar;
 import org.warp.picalculator.gui.expression.BlockDivision;
 import org.warp.picalculator.gui.expression.BlockParenthesis;
+import org.warp.picalculator.gui.expression.BlockPower;
 import org.warp.picalculator.gui.expression.BlockSquareRoot;
 import org.warp.picalculator.math.MathematicalSymbols;
 
@@ -29,8 +30,12 @@ public class NormalInputContainer extends InputContainer {
 			case MathematicalSymbols.SQUARE_ROOT:
 				return new BlockSquareRoot();
 			case MathematicalSymbols.PARENTHESIS_OPEN:
-			case MathematicalSymbols.PARENTHESIS_CLOSE:
 				return new BlockParenthesis();
+			case MathematicalSymbols.PARENTHESIS_CLOSE:
+				return null;
+			case MathematicalSymbols.POWER:
+			case MathematicalSymbols.POWER_OF_TWO:
+				return new BlockPower();
 			case MathematicalSymbols.MULTIPLICATION:
 			case MathematicalSymbols.SUM:
 			case MathematicalSymbols.SUM_SUBTRACTION:
@@ -50,4 +55,12 @@ public class NormalInputContainer extends InputContainer {
 				return new BlockChar(c);
 		}
 	}
+	
+	@Override
+	public void typeChar(char c) {
+		super.typeChar(c);
+		if (c == MathematicalSymbols.PARENTHESIS_CLOSE) {
+			this.moveRight();
+		}
+	}
 }

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

@@ -10,6 +10,10 @@ import org.warp.picalculator.gui.expression.Block;
 import org.warp.picalculator.gui.expression.BlockChar;
 import org.warp.picalculator.gui.expression.BlockContainer;
 import org.warp.picalculator.gui.expression.BlockDivision;
+import org.warp.picalculator.gui.expression.BlockExponentialNotation;
+import org.warp.picalculator.gui.expression.BlockParenthesis;
+import org.warp.picalculator.gui.expression.BlockPower;
+import org.warp.picalculator.gui.expression.BlockSquareRoot;
 import org.warp.picalculator.gui.expression.containers.InputContainer;
 import org.warp.picalculator.math.Function;
 import org.warp.picalculator.math.FunctionOperator;
@@ -17,6 +21,8 @@ import org.warp.picalculator.math.FunctionSingle;
 import org.warp.picalculator.math.MathContext;
 import org.warp.picalculator.math.MathematicalSymbols;
 import org.warp.picalculator.math.functions.Number;
+import org.warp.picalculator.math.functions.Power;
+import org.warp.picalculator.math.functions.RootSquare;
 import org.warp.picalculator.math.functions.Subtraction;
 import org.warp.picalculator.math.functions.Sum;
 import org.warp.picalculator.math.functions.SumSubtraction;
@@ -29,12 +35,17 @@ import org.warp.picalculator.math.parser.features.FeatureChar;
 import org.warp.picalculator.math.parser.features.FeatureDivision;
 import org.warp.picalculator.math.parser.features.FeatureMultiplication;
 import org.warp.picalculator.math.parser.features.FeatureNumber;
+import org.warp.picalculator.math.parser.features.FeatureParenthesis;
+import org.warp.picalculator.math.parser.features.FeaturePower;
+import org.warp.picalculator.math.parser.features.FeatureSquareRoot;
 import org.warp.picalculator.math.parser.features.FeatureSum;
 import org.warp.picalculator.math.parser.features.FeatureVariable;
 import org.warp.picalculator.math.parser.features.interfaces.Feature;
 import org.warp.picalculator.math.parser.features.interfaces.FeatureDouble;
+import org.warp.picalculator.math.parser.features.interfaces.FeatureSingle;
 
 import com.sun.org.apache.xpath.internal.functions.Function2Args;
+import com.sun.org.apache.xpath.internal.operations.Mult;
 
 import it.unimi.dsi.fastutil.objects.ObjectArrayList;
 import it.unimi.dsi.fastutil.objects.ObjectListIterator;
@@ -50,7 +61,7 @@ public class MathParser {
 		return result;
 	}
 
-	public static ObjectArrayList<Block> parseOutput(MathContext context, ObjectArrayList<Function> expr) {
+	public static ObjectArrayList<Block> parseOutput(MathContext context, ObjectArrayList<Function> expr) throws Error {
 		final ObjectArrayList<Block> resultBlocks = new ObjectArrayList<>();
 		
 		for (Function f : expr) {
@@ -60,7 +71,7 @@ public class MathParser {
 		return resultBlocks;
 	}
 	
-	private static ObjectArrayList<Block> parseFunction(MathContext context, Function func) {
+	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));
@@ -71,23 +82,124 @@ public class MathParser {
 				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 nc = bp.getNumberContainer();
+				BlockContainer ec = bp.getExponentContainer();
+				for (Block b : sub1) {
+					nc.appendBlockUnsafe(b);
+				}
+				for (Block b : sub2) {
+					ec.appendBlockUnsafe(b);
+				}
+				nc.recomputeDimensions();
+				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;
-			BigDecimal decimal = numb.getTerm();
-			String numberString;
-			if (numb.isInteger()) {
-				BigInteger integ = decimal.toBigInteger();
-				numberString = integ.toString();
+			String numberString = numb.toString();
+			if (numberString.contains("ℯ℮")) {
+				String[] numberParts = numberString.split("ℯ℮", 2);
+				numberParts[0]+="ℯ℮";
+				BlockPower bp = new BlockExponentialNotation();
+				BlockContainer bpnc = bp.getNumberContainer();
+				BlockContainer bpec = bp.getExponentContainer();
+				for (char c : numberParts[0].toCharArray()) {
+					bpnc.appendBlockUnsafe(new BlockChar(c));
+				}
+				for (char c : numberParts[1].toCharArray()) {
+					bpec.appendBlockUnsafe(new BlockChar(c));
+				}
+				bpnc.recomputeDimensions();
+				bpec.recomputeDimensions();
+				bp.recomputeDimensions();
+				result.add(bp);
+				return result;
 			} else {
-				numberString = decimal.toPlainString();
-			}
-			for (char c : numberString.toCharArray()) {
-				result.add(new BlockChar(c));
+				for (char c : numberString.toCharArray()) {
+					result.add(new BlockChar(c));
+				}
 			}
 			return result;
 		}
-		throw new UnsupportedOperationException("Unknown function " + func.getClass().getSimpleName());
+		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 {
@@ -117,8 +229,24 @@ public class MathParser {
 				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 nmb = parseContainer(context, blp.getNumberContainer().getContent());
+				final Function exp = parseContainer(context, blp.getExponentContainer().getContent());
+				result = new FeaturePower(nmb, exp);
+				break;
 			default:
-				throw new Error(Errors.SYNTAX_ERROR);
+				throw new Error(Errors.NOT_IMPLEMENTED, "The block " + block.getClass().getSimpleName() + " isn't a known BLock");
 		}
 
 		return result;
@@ -141,76 +269,117 @@ public class MathParser {
 
 	private static void fixStack(MathContext context, ObjectArrayList<Function> process) throws Error {
 
-		//Phase 1
-		ObjectListIterator<Function> stackIterator = process.listIterator(process.size());
-		Function lastElement = null;
-		while (stackIterator.hasPrevious()) {
-			final Function f = stackIterator.previous();
-
-			if (f instanceof FunctionSingle) {
-				if (((FunctionSingle) f).getParameter() == null) {
-					if (lastElement == null) {
-						throw new Error(Errors.MISSING_ARGUMENTS, "There is a function at the end without any argument specified.");
-					} else {
-						((FunctionSingle) f).setParameter(lastElement);
-						process.remove(stackIterator.nextIndex());
+		boolean lastLoopDidSomething;
+		
+		ObjectListIterator<Function> stackIterator;
+		
+		//Phase 0: join number and variables ([2][x] => [[2]*[x]])
+		do {
+			lastLoopDidSomething = false;
+			stackIterator = process.listIterator(process.size());
+			Function lastElement = null;
+			while (stackIterator.hasPrevious()) {
+				final Function f = stackIterator.previous();
+				final int curIndex = stackIterator.nextIndex();
+	
+				if (f instanceof Number | f instanceof Variable) {
+					if (lastElement instanceof Variable) {
+						lastLoopDidSomething = true;
+						final Function var = process.get(curIndex + 1);
+						final Function numb = process.get(curIndex);
+						stackIterator.set(new Multiplication(context, numb, var));
+						process.remove(curIndex + 1);
 					}
 				}
+				lastElement = f;
 			}
-			lastElement = f;
-		}
+		} while (lastLoopDidSomething);
+		
+		//Phase 1
+		do {
+			lastLoopDidSomething = false;
+			stackIterator = process.listIterator(process.size());
+			Function lastElement = null;
+			while (stackIterator.hasPrevious()) {
+				final Function f = stackIterator.previous();
+
+				if (f instanceof FunctionSingle) {
+					if (((FunctionSingle) f).getParameter() == null) {
+						lastLoopDidSomething = true;
+						if (lastElement == null) {
+							throw new Error(Errors.MISSING_ARGUMENTS, "There is a function at the end without any argument specified.");
+						} else {
+							((FunctionSingle) f).setParameter(lastElement);
+							process.remove(stackIterator.nextIndex());
+						}
+					}
+				}
+				lastElement = f;
+			}
+		} while (lastLoopDidSomething);
 
 		//Phase 2
-		stackIterator = process.listIterator();
-		while (stackIterator.hasNext()) {
-			final Function f = stackIterator.next();
-			final int curIndex = stackIterator.previousIndex();
+		do {
+			lastLoopDidSomething = false;
+			stackIterator = process.listIterator();
+			while (stackIterator.hasNext()) {
+				final Function f = stackIterator.next();
+				final int curIndex = stackIterator.previousIndex();
 
-			if (f instanceof Multiplication || f instanceof Division) {
-				if (curIndex - 1 >= 0 && stackIterator.hasNext()) {
-					final Function next = process.get(curIndex + 1);
-					final Function prev = process.get(curIndex - 1);
-					stackIterator.set(f.setParameter(0, prev).setParameter(1, next));
-					process.remove(curIndex + 1);
-					process.remove(curIndex - 1);
-				} else {
-					if (f.getParameter(0) == null || f.getParameter(1) == null) {
-						throw new Error(Errors.MISSING_ARGUMENTS, "There is a function at the end without any argument specified.");
+				if (f instanceof Multiplication || f instanceof Division) {
+					if (curIndex - 1 >= 0 && stackIterator.hasNext()) {
+						lastLoopDidSomething = true;
+						final Function next = process.get(curIndex + 1);
+						final Function prev = process.get(curIndex - 1);
+						stackIterator.set(f.setParameter(0, prev).setParameter(1, next));
+						process.remove(curIndex + 1);
+						process.remove(curIndex - 1);
+					} else {
+						if (f.getParameter(0) == null || f.getParameter(1) == null) {
+							throw new Error(Errors.MISSING_ARGUMENTS, "There is a function at the end without any argument specified.");
+						}
 					}
 				}
 			}
-		}
+		} while (lastLoopDidSomething);
 
 		//Phase 3
-		stackIterator = process.listIterator();
-		while (stackIterator.hasNext()) {
-			final Function f = stackIterator.next();
-			final int curIndex = stackIterator.previousIndex();
+		do {
+			lastLoopDidSomething = false;
+			stackIterator = process.listIterator();
+			while (stackIterator.hasNext()) {
+				final Function f = stackIterator.next();
+				final int curIndex = stackIterator.previousIndex();
 
-			if (f instanceof Sum || f instanceof Subtraction || f instanceof SumSubtraction) {
-				if (curIndex - 1 >= 0 && stackIterator.hasNext()) {
-					final Function next = process.get(curIndex + 1);
-					final Function prev = process.get(curIndex - 1);
-					stackIterator.set(f.setParameter(0, prev).setParameter(1, next));
-					process.remove(curIndex + 1);
-					process.remove(curIndex - 1);
-				} else {
-					if (f.getParameter(0) == null || f.getParameter(1) == null) {
-						throw new Error(Errors.MISSING_ARGUMENTS, "There is a function at the end without any argument specified.");
+				if (f instanceof Sum || f instanceof Subtraction || f instanceof SumSubtraction) {
+					if (curIndex - 1 >= 0 && stackIterator.hasNext()) {
+						lastLoopDidSomething = true;
+						final Function next = process.get(curIndex + 1);
+						final Function prev = process.get(curIndex - 1);
+						stackIterator.set(f.setParameter(0, prev).setParameter(1, next));
+						process.remove(curIndex + 1);
+						process.remove(curIndex - 1);
+					} else {
+						if (f.getParameter(0) == null || f.getParameter(1) == null) {
+							throw new Error(Errors.MISSING_ARGUMENTS, "There is a function at the end without any argument specified.");
+						}
 					}
 				}
 			}
-		}
+		} while (lastLoopDidSomething);
 
 		//Phase 4
-		stackIterator = process.iterator();
-		while (stackIterator.hasNext()) {
-			final Function f = stackIterator.next();
+		do {
+			lastLoopDidSomething = false;
+			stackIterator = process.iterator();
+			while (stackIterator.hasNext()) {
+				final Function f = stackIterator.next();
 
-			if (f instanceof Function2Args) {
+				if (f instanceof Function2Args) {
 
+				}
 			}
-		}
+		} while (lastLoopDidSomething);
 	}
 
 	private static ObjectArrayList<Function> makeFunctions(MathContext context, ObjectArrayList<Feature> features)
@@ -226,6 +395,12 @@ public class MathParser {
 				process.add(new Variable(context, ((FeatureVariable) f).ch, ((FeatureVariable) f).varType));
 			} else if (f instanceof FeatureSum) {
 				process.add(new Sum(context, (Function) ((FeatureDouble) f).getChild1(), (Function) ((FeatureDouble) f).getChild2()));
+			} else if (f instanceof FeaturePower) {
+				process.add(new Power(context, (Function) ((FeatureDouble) f).getChild1(), (Function) ((FeatureDouble) f).getChild2()));
+			} else if (f instanceof FeatureSquareRoot) {
+				process.add(new RootSquare(context, (Function) ((FeatureSingle) f).getChild()));
+			} else if (f instanceof FeatureParenthesis) {
+				process.add(new Expression(context, (Function) ((FeatureSingle) f).getChild()));
 //			}  else if (f instanceof FeatureSubtraction) {
 //				process.add(new Subtraction(context, (Function) ((FeatureDouble) f).getChild1(), (Function) ((FeatureDouble) f).getChild2()));
 //			}  else if (f instanceof FeatureSumSubtraction) {
@@ -321,7 +496,7 @@ public class MathParser {
 						break;
 					}
 				}
-				if (bcf.ch == '-') {
+				if (bcf.ch == '-' || bcf.ch == '.') {
 					isNumber = true;
 				}
 				if (isNumber) {

src/org/warp/picalculator/math/parser/features/FeatureParenthesis.java

@@ -0,0 +1,9 @@
+package org.warp.picalculator.math.parser.features;
+
+public class FeatureParenthesis extends FeatureSingleImpl {
+
+	public FeatureParenthesis(Object child) {
+		super(child);
+	}
+
+}

src/org/warp/picalculator/math/parser/features/FeaturePower.java

@@ -0,0 +1,11 @@
+package org.warp.picalculator.math.parser.features;
+
+import org.warp.picalculator.math.parser.features.interfaces.Feature;
+
+public class FeaturePower extends FeatureDoubleImpl {
+
+	public FeaturePower(Object child1, Object child2) {
+		super(child1, child2);
+	}
+
+}

src/org/warp/picalculator/math/parser/features/FeatureSquareRoot.java

@@ -0,0 +1,9 @@
+package org.warp.picalculator.math.parser.features;
+
+public class FeatureSquareRoot extends FeatureSingleImpl {
+
+	public FeatureSquareRoot(Object child) {
+		super(child);
+	}
+
+}