calculator

Class SimpleCalculator

java.lang.Object

javafx.scene.Node

javafx.scene.Parent

javafx.scene.layout.Region

javafx.scene.layout.Pane

javafx.scene.layout.VBox

console.Console

calculator.SimpleCalculator

All Implemented Interfaces:

javafx.css.Styleable, javafx.event.EventTarget

public class SimpleCalculator
extends Console

This class extends the Console class to implement a simple shift-reduce calculator. This calculator can evaluate expressions of the form NUM [OP NUM].

Property Summary

Properties inherited from class javafx.scene.layout.VBox

alignmentProperty, fillWidthProperty, spacingProperty

Properties inherited from class javafx.scene.layout.Region

backgroundProperty, borderProperty, cacheShapeProperty, centerShapeProperty, heightProperty, insetsProperty, maxHeightProperty, maxWidthProperty, minHeightProperty, minWidthProperty, opaqueInsetsProperty, paddingProperty, prefHeightProperty, prefWidthProperty, scaleShapeProperty, shapeProperty, snapToPixelProperty, widthProperty

Properties inherited from class javafx.scene.Parent

impl_traversalEngineProperty, needsLayoutProperty

Properties inherited from class javafx.scene.Node

accessibleHelpProperty, accessibleRoleDescriptionProperty, accessibleRoleProperty, accessibleTextProperty, blendModeProperty, boundsInLocalProperty, boundsInParentProperty, cacheHintProperty, cacheProperty, clipProperty, cursorProperty, depthTestProperty, disabledProperty, disableProperty, effectiveNodeOrientationProperty, effectProperty, eventDispatcherProperty, focusedProperty, focusTraversableProperty, hoverProperty, idProperty, impl_showMnemonicsProperty, impl_treeVisibleProperty, inputMethodRequestsProperty, layoutBoundsProperty, layoutXProperty, layoutYProperty, localToParentTransformProperty, localToSceneTransformProperty, managedProperty, mouseTransparentProperty, nodeOrientationProperty, onContextMenuRequestedProperty, onDragDetectedProperty, onDragDoneProperty, onDragDroppedProperty, onDragEnteredProperty, onDragExitedProperty, onDragOverProperty, onInputMethodTextChangedProperty, onKeyPressedProperty, onKeyReleasedProperty, onKeyTypedProperty, onMouseClickedProperty, onMouseDragEnteredProperty, onMouseDragExitedProperty, onMouseDraggedProperty, onMouseDragOverProperty, onMouseDragReleasedProperty, onMouseEnteredProperty, onMouseExitedProperty, onMouseMovedProperty, onMousePressedProperty, onMouseReleasedProperty, onRotateProperty, onRotationFinishedProperty, onRotationStartedProperty, onScrollFinishedProperty, onScrollProperty, onScrollStartedProperty, onSwipeDownProperty, onSwipeLeftProperty, onSwipeRightProperty, onSwipeUpProperty, onTouchMovedProperty, onTouchPressedProperty, onTouchReleasedProperty, onTouchStationaryProperty, onZoomFinishedProperty, onZoomProperty, onZoomStartedProperty, opacityProperty, parentProperty, pickOnBoundsProperty, pressedProperty, rotateProperty, rotationAxisProperty, scaleXProperty, scaleYProperty, scaleZProperty, sceneProperty, styleProperty, translateXProperty, translateYProperty, translateZProperty, visibleProperty

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	SimpleCalculator.State An enumeration of possible state name values.

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.String	EOI
static java.lang.String	NUM
static java.lang.String	OP_OR_END

Fields inherited from class javafx.scene.layout.Region

USE_COMPUTED_SIZE, USE_PREF_SIZE

Fields inherited from class javafx.scene.Node

BASELINE_OFFSET_SAME_AS_HEIGHT

Constructor Summary

Constructors

Constructor and Description
SimpleCalculator(java.lang.String title) Creates a calculator by configuring the console and initializing an empty stack.

Method Summary

Modifier and Type	Method and Description
void	end() Performs the processing in the state named END.
double	evaluate() Performs the evaluation of the input expression.
TokenDispenser	getDispenser() Gets the token dispenser for the current input.
java.lang.String	getErrorMessage() Gets the current error message, if any.
double	getResult() Gets the result of evaluating the input.
java.util.Stack<java.lang.Object>	getStack() Getter for the expression stack.
SimpleCalculator.State	getState() Getter for the current state of the state machine.
void	handleInput(java.lang.String input) Handles the input to the calculator.
static void	main(java.lang.String[] args)
boolean	numOpNumOnStack() Determines whether NUM OP NUM is on the stack.
void	reduce() Reduces the stack from either NUM or NUM OP NUM to NUM.
void	reduceNumOpNum() Reduces NUM OP NUM on stack to NUM.
void	setState(SimpleCalculator.State state) Setter for the current state of the state machine.
void	shift() Shifts the current token onto the stack.
void	syntaxError(java.lang.String expected) Throws a syntax error indicating what the parser was expecting and what it received.

Methods inherited from class console.Console

getTitle, updateDisplay

Methods inherited from class javafx.scene.layout.VBox

alignmentProperty, clearConstraints, computeMinHeight, computeMinWidth, computePrefHeight, computePrefWidth, fillWidthProperty, getAlignment, getClassCssMetaData, getContentBias, getCssMetaData, getMargin, getSpacing, getVgrow, isFillWidth, layoutChildren, requestLayout, setAlignment, setFillWidth, setMargin, setSpacing, setVgrow, spacingProperty

Methods inherited from class javafx.scene.layout.Pane

getChildren

Methods inherited from class javafx.scene.layout.Region

backgroundProperty, borderProperty, cacheShapeProperty, centerShapeProperty, computeMaxHeight, computeMaxWidth, getBackground, getBorder, getHeight, getInsets, getMaxHeight, getMaxWidth, getMinHeight, getMinWidth, getOpaqueInsets, getPadding, getPrefHeight, getPrefWidth, getShape, getUserAgentStylesheet, getWidth, heightProperty, impl_computeContains, impl_computeGeomBounds, impl_computeLayoutBounds, impl_createPeer, impl_notifyLayoutBoundsChanged, impl_pickNodeLocal, impl_updatePeer, insetsProperty, isCacheShape, isCenterShape, isResizable, isScaleShape, isSnapToPixel, layoutInArea, layoutInArea, layoutInArea, layoutInArea, maxHeight, maxHeightProperty, maxWidth, maxWidthProperty, minHeight, minHeightProperty, minWidth, minWidthProperty, opaqueInsetsProperty, paddingProperty, positionInArea, positionInArea, prefHeight, prefHeightProperty, prefWidth, prefWidthProperty, resize, scaleShapeProperty, setBackground, setBorder, setCacheShape, setCenterShape, setHeight, setMaxHeight, setMaxSize, setMaxWidth, setMinHeight, setMinSize, setMinWidth, setOpaqueInsets, setPadding, setPrefHeight, setPrefSize, setPrefWidth, setScaleShape, setShape, setSnapToPixel, setWidth, shapeProperty, snappedBottomInset, snappedLeftInset, snappedRightInset, snappedTopInset, snapPosition, snapSize, snapSpace, snapToPixelProperty, widthProperty

Methods inherited from class javafx.scene.Parent

getBaselineOffset, getChildrenUnmodifiable, getImpl_traversalEngine, getManagedChildren, getStylesheets, impl_getAllParentStylesheets, impl_processCSS, impl_processMXNode, impl_traversalEngineProperty, isNeedsLayout, layout, lookup, needsLayoutProperty, queryAccessibleAttribute, requestParentLayout, setImpl_traversalEngine, setNeedsLayout, updateBounds

Methods inherited from class javafx.scene.Node

accessibleHelpProperty, accessibleRoleDescriptionProperty, accessibleRoleProperty, accessibleTextProperty, addEventFilter, addEventHandler, applyCss, autosize, blendModeProperty, boundsInLocalProperty, boundsInParentProperty, buildEventDispatchChain, cacheHintProperty, cacheProperty, clipProperty, computeAreaInScreen, contains, contains, containsBounds, cursorProperty, depthTestProperty, disabledProperty, disableProperty, effectiveNodeOrientationProperty, effectProperty, eventDispatcherProperty, executeAccessibleAction, fireEvent, focusedProperty, focusTraversableProperty, getAccessibleHelp, getAccessibleRole, getAccessibleRoleDescription, getAccessibleText, getBlendMode, getBoundsInLocal, getBoundsInParent, getCacheHint, getClip, getCursor, getDepthTest, getEffect, getEffectiveNodeOrientation, getEventDispatcher, getId, getInputMethodRequests, getLayoutBounds, getLayoutX, getLayoutY, getLocalToParentTransform, getLocalToSceneTransform, getNodeOrientation, getOnContextMenuRequested, getOnDragDetected, getOnDragDone, getOnDragDropped, getOnDragEntered, getOnDragExited, getOnDragOver, getOnInputMethodTextChanged, getOnKeyPressed, getOnKeyReleased, getOnKeyTyped, getOnMouseClicked, getOnMouseDragEntered, getOnMouseDragExited, getOnMouseDragged, getOnMouseDragOver, getOnMouseDragReleased, getOnMouseEntered, getOnMouseExited, getOnMouseMoved, getOnMousePressed, getOnMouseReleased, getOnRotate, getOnRotationFinished, getOnRotationStarted, getOnScroll, getOnScrollFinished, getOnScrollStarted, getOnSwipeDown, getOnSwipeLeft, getOnSwipeRight, getOnSwipeUp, getOnTouchMoved, getOnTouchPressed, getOnTouchReleased, getOnTouchStationary, getOnZoom, getOnZoomFinished, getOnZoomStarted, getOpacity, getParent, getProperties, getPseudoClassStates, getRotate, getRotationAxis, getScaleX, getScaleY, getScaleZ, getScene, getStyle, getStyleableParent, getStyleClass, getTransforms, getTranslateX, getTranslateY, getTranslateZ, getTypeSelector, getUserData, hasProperties, hoverProperty, idProperty, impl_clearDirty, impl_computeIntersects, impl_cssGetCursorInitialValue, impl_cssGetFocusTraversableInitialValue, impl_findStyles, impl_geomChanged, impl_getLeafTransform, impl_getMatchingStyles, impl_getPeer, impl_getPivotX, impl_getPivotY, impl_getPivotZ, impl_getStyleMap, impl_hasTransforms, impl_intersects, impl_intersectsBounds, impl_isDirty, impl_isDirtyEmpty, impl_isShowMnemonics, impl_isTreeVisible, impl_layoutBoundsChanged, impl_markDirty, impl_pickNode, impl_processCSS, impl_reapplyCSS, impl_setShowMnemonics, impl_setStyleMap, impl_showMnemonicsProperty, impl_syncPeer, impl_transformsChanged, impl_traverse, impl_treeVisibleProperty, inputMethodRequestsProperty, intersects, intersects, isCache, isDisable, isDisabled, isFocused, isFocusTraversable, isHover, isManaged, isMouseTransparent, isPickOnBounds, isPressed, isVisible, layoutBoundsProperty, layoutXProperty, layoutYProperty, localToParent, localToParent, localToParent, localToParent, localToParent, localToParentTransformProperty, localToScene, localToScene, localToScene, localToScene, localToScene, localToScene, localToScene, localToScene, localToScene, localToScene, localToSceneTransformProperty, localToScreen, localToScreen, localToScreen, localToScreen, localToScreen, lookupAll, managedProperty, mouseTransparentProperty, nodeOrientationProperty, notifyAccessibleAttributeChanged, onContextMenuRequestedProperty, onDragDetectedProperty, onDragDoneProperty, onDragDroppedProperty, onDragEnteredProperty, onDragExitedProperty, onDragOverProperty, onInputMethodTextChangedProperty, onKeyPressedProperty, onKeyReleasedProperty, onKeyTypedProperty, onMouseClickedProperty, onMouseDragEnteredProperty, onMouseDragExitedProperty, onMouseDraggedProperty, onMouseDragOverProperty, onMouseDragReleasedProperty, onMouseEnteredProperty, onMouseExitedProperty, onMouseMovedProperty, onMousePressedProperty, onMouseReleasedProperty, onRotateProperty, onRotationFinishedProperty, onRotationStartedProperty, onScrollFinishedProperty, onScrollProperty, onScrollStartedProperty, onSwipeDownProperty, onSwipeLeftProperty, onSwipeRightProperty, onSwipeUpProperty, onTouchMovedProperty, onTouchPressedProperty, onTouchReleasedProperty, onTouchStationaryProperty, onZoomFinishedProperty, onZoomProperty, onZoomStartedProperty, opacityProperty, parentProperty, parentToLocal, parentToLocal, parentToLocal, parentToLocal, parentToLocal, pickOnBoundsProperty, pressedProperty, pseudoClassStateChanged, relocate, removeEventFilter, removeEventHandler, requestFocus, resizeRelocate, rotateProperty, rotationAxisProperty, scaleXProperty, scaleYProperty, scaleZProperty, sceneProperty, sceneToLocal, sceneToLocal, sceneToLocal, sceneToLocal, sceneToLocal, sceneToLocal, sceneToLocal, sceneToLocal, screenToLocal, screenToLocal, screenToLocal, setAccessibleHelp, setAccessibleRole, setAccessibleRoleDescription, setAccessibleText, setBlendMode, setCache, setCacheHint, setClip, setCursor, setDepthTest, setDisable, setDisabled, setEffect, setEventDispatcher, setEventHandler, setFocused, setFocusTraversable, setHover, setId, setInputMethodRequests, setLayoutX, setLayoutY, setManaged, setMouseTransparent, setNodeOrientation, setOnContextMenuRequested, setOnDragDetected, setOnDragDone, setOnDragDropped, setOnDragEntered, setOnDragExited, setOnDragOver, setOnInputMethodTextChanged, setOnKeyPressed, setOnKeyReleased, setOnKeyTyped, setOnMouseClicked, setOnMouseDragEntered, setOnMouseDragExited, setOnMouseDragged, setOnMouseDragOver, setOnMouseDragReleased, setOnMouseEntered, setOnMouseExited, setOnMouseMoved, setOnMousePressed, setOnMouseReleased, setOnRotate, setOnRotationFinished, setOnRotationStarted, setOnScroll, setOnScrollFinished, setOnScrollStarted, setOnSwipeDown, setOnSwipeLeft, setOnSwipeRight, setOnSwipeUp, setOnTouchMoved, setOnTouchPressed, setOnTouchReleased, setOnTouchStationary, setOnZoom, setOnZoomFinished, setOnZoomStarted, setOpacity, setPickOnBounds, setPressed, setRotate, setRotationAxis, setScaleX, setScaleY, setScaleZ, setStyle, setTranslateX, setTranslateY, setTranslateZ, setUserData, setVisible, snapshot, snapshot, startDragAndDrop, startFullDrag, styleProperty, toBack, toFront, toString, translateXProperty, translateYProperty, translateZProperty, usesMirroring, visibleProperty

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

NUM

public static final java.lang.String NUM

See Also:

Constant Field Values

OP_OR_END

public static final java.lang.String OP_OR_END

See Also:

Constant Field Values

EOI

public static final java.lang.String EOI

See Also:

Constant Field Values

Constructor Detail

SimpleCalculator

public SimpleCalculator(java.lang.String title)

Creates a calculator by configuring the console and initializing an empty stack.

Parameters:

title - a title for the console

Method Detail

handleInput

public void handleInput(java.lang.String input)

Handles the input to the calculator. The input is evaluated and the result displayed. If the input contains an error, the error is displayed. This method overrides a method of the same name in the Console class.

Overrides:

handleInput in class Console

Parameters:

input - an expression string to be evaluated

getDispenser

public TokenDispenser getDispenser()

Gets the token dispenser for the current input. This method is provided for subclasses.

Returns:

the token dispenser

getResult

public double getResult()

Gets the result of evaluating the input.

Returns:

the value of the input expression

getErrorMessage

public java.lang.String getErrorMessage()

Gets the current error message, if any.

Returns:

the current error message (may be empty)

evaluate

public double evaluate()

Performs the evaluation of the input expression. Evaluation proceeds by implementing the state machine described by the associated state diagram. Note that the case clauses of the switch statement correspond to state names in the diagram, and that similarly named private methods carry out the required processing. The state names are values of the enumerated type called State. This method is public so it can be overridden by subclasses.

Returns:

the value of the input expression.

syntaxError

public void syntaxError(java.lang.String expected)

Throws a syntax error indicating what the parser was expecting and what it received.

Parameters:

expected - a string indicating what the parser was expecting

shift

public void shift()

Shifts the current token onto the stack. This method is public so that it can be used by subclasses.

end

public void end()

Performs the processing in the state named END. The stack is reduced from NUM or NUM OP NUM to NUM.

reduce

public void reduce()

Reduces the stack from either NUM or NUM OP NUM to NUM. This method is public so that it can be used or overridden by subclasses.

numOpNumOnStack

public boolean numOpNumOnStack()

Determines whether NUM OP NUM is on the stack. This method is public so that it can be used by subclasses.

Returns:

true if NUM OP NUM is on the stack, false otherwise

reduceNumOpNum

public void reduceNumOpNum()

Reduces NUM OP NUM on stack to NUM. This method should only be called when numOpNumOnStack() returns true. This method is public so that it can be used by subclasses.

getState

public SimpleCalculator.State getState()

Getter for the current state of the state machine.

Returns:

the current state

setState

public void setState(SimpleCalculator.State state)

Setter for the current state of the state machine.

Parameters:

state - the current state

getStack

public java.util.Stack<java.lang.Object> getStack()

Getter for the expression stack.

Returns:

the expression stack

main

public static void main(java.lang.String[] args)