Package org.lsmp.djepExamples

Class BlockStatments

java.lang.Object

java.awt.Component

java.awt.Container

java.awt.Panel

java.applet.Applet

org.lsmp.djepExamples.Console

org.lsmp.djepExamples.BlockStatments

All Implemented Interfaces:

KeyListener, ImageObserver, MenuContainer, Serializable, EventListener, Accessible

public class BlockStatments
extends Console

Example code illustrating how block control structures could be implemented.

Sample session

JEP > a=3
3.0
JEP > IF a>2
JEP  > IF a>3
JEP   > b=4
skipped
JEP   > ELSE
JEP   > b=3
3.0
JEP   > ENDIF
JEP  > ELSE
JEP  > b=2
skipped
JEP  > ENDIF
JEP > b
3.0
JEP >

This code does currently allow looping statements.

See Also:

• Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class java.applet.Applet

Applet.AccessibleApplet

Nested classes/interfaces inherited from class java.awt.Panel

Panel.AccessibleAWTPanel

Nested classes/interfaces inherited from class java.awt.Container

Container.AccessibleAWTContainer

Nested classes/interfaces inherited from class java.awt.Component

Component.AccessibleAWTComponent, Component.BaselineResizeBehavior, Component.BltBufferStrategy, Component.FlipBufferStrategy

Field Summary

Fields

Modifier and Type	Field	Description
protected Stack	conds
protected Stack	states	Indicates current state where in

Fields inherited from class org.lsmp.djepExamples.Console

j, ta

Fields inherited from class java.awt.Component

accessibleContext, BOTTOM_ALIGNMENT, CENTER_ALIGNMENT, LEFT_ALIGNMENT, RIGHT_ALIGNMENT, TOP_ALIGNMENT

Fields inherited from interface java.awt.image.ImageObserver

ABORT, ALLBITS, ERROR, FRAMEBITS, HEIGHT, PROPERTIES, SOMEBITS, WIDTH

Constructor Summary

Constructors

Constructor	Description
BlockStatments()

Method Summary

Modifier and Type	Method	Description
String	getPrompt()	Prints the prompt string.
static void	main(String[] args)	Creates a new Console object and calls run()
void	printHelp()	Print help message.
void	printIntroText()	Prints introductory text.
void	processEquation(Node node)	Evaluates a node, but only if the state corresponds to the conditionValue.
boolean	testSpecialCommands(String command)	Catches macros which are not handled by JEP

Methods inherited from class org.lsmp.djepExamples.Console

getAppletInfo, getCommand, handleError, init, initialise, inputLoop, keyPressed, keyReleased, keyTyped, print, printFuns, println, printOps, printStdHelp, printVars, processCommand, run, split

Methods inherited from class java.applet.Applet

destroy, getAccessibleContext, getAppletContext, getAudioClip, getAudioClip, getCodeBase, getDocumentBase, getImage, getImage, getLocale, getParameter, getParameterInfo, isActive, isValidateRoot, newAudioClip, play, play, resize, resize, setStub, showStatus, start, stop

Methods inherited from class java.awt.Panel

addNotify

Methods inherited from class java.awt.Container

add, add, add, add, add, addContainerListener, addImpl, addPropertyChangeListener, addPropertyChangeListener, applyComponentOrientation, areFocusTraversalKeysSet, countComponents, deliverEvent, doLayout, findComponentAt, findComponentAt, getAlignmentX, getAlignmentY, getComponent, getComponentAt, getComponentAt, getComponentCount, getComponents, getComponentZOrder, getContainerListeners, getFocusTraversalKeys, getFocusTraversalPolicy, getInsets, getLayout, getListeners, getMaximumSize, getMinimumSize, getMousePosition, getPreferredSize, insets, invalidate, isAncestorOf, isFocusCycleRoot, isFocusCycleRoot, isFocusTraversalPolicyProvider, isFocusTraversalPolicySet, layout, list, list, locate, minimumSize, paint, paintComponents, paramString, preferredSize, print, printComponents, processContainerEvent, processEvent, remove, remove, removeAll, removeContainerListener, removeNotify, setComponentZOrder, setFocusCycleRoot, setFocusTraversalKeys, setFocusTraversalPolicy, setFocusTraversalPolicyProvider, setFont, setLayout, transferFocusDownCycle, update, validate, validateTree

Methods inherited from class java.awt.Component

action, add, addComponentListener, addFocusListener, addHierarchyBoundsListener, addHierarchyListener, addInputMethodListener, addKeyListener, addMouseListener, addMouseMotionListener, addMouseWheelListener, bounds, checkImage, checkImage, coalesceEvents, contains, contains, createImage, createImage, createVolatileImage, createVolatileImage, disable, disableEvents, dispatchEvent, enable, enable, enableEvents, enableInputMethods, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, getBackground, getBaseline, getBaselineResizeBehavior, getBounds, getBounds, getColorModel, getComponentListeners, getComponentOrientation, getCursor, getDropTarget, getFocusCycleRootAncestor, getFocusListeners, getFocusTraversalKeysEnabled, getFont, getFontMetrics, getForeground, getGraphics, getGraphicsConfiguration, getHeight, getHierarchyBoundsListeners, getHierarchyListeners, getIgnoreRepaint, getInputContext, getInputMethodListeners, getInputMethodRequests, getKeyListeners, getLocation, getLocation, getLocationOnScreen, getMouseListeners, getMouseMotionListeners, getMousePosition, getMouseWheelListeners, getName, getParent, getPropertyChangeListeners, getPropertyChangeListeners, getSize, getSize, getToolkit, getTreeLock, getWidth, getX, getY, gotFocus, handleEvent, hasFocus, hide, imageUpdate, inside, isBackgroundSet, isCursorSet, isDisplayable, isDoubleBuffered, isEnabled, isFocusable, isFocusOwner, isFocusTraversable, isFontSet, isForegroundSet, isLightweight, isMaximumSizeSet, isMinimumSizeSet, isOpaque, isPreferredSizeSet, isShowing, isValid, isVisible, keyDown, keyUp, list, list, list, location, lostFocus, mouseDown, mouseDrag, mouseEnter, mouseExit, mouseMove, mouseUp, move, nextFocus, paintAll, postEvent, prepareImage, prepareImage, printAll, processComponentEvent, processFocusEvent, processHierarchyBoundsEvent, processHierarchyEvent, processInputMethodEvent, processKeyEvent, processMouseEvent, processMouseMotionEvent, processMouseWheelEvent, remove, removeComponentListener, removeFocusListener, removeHierarchyBoundsListener, removeHierarchyListener, removeInputMethodListener, removeKeyListener, removeMouseListener, removeMouseMotionListener, removeMouseWheelListener, removePropertyChangeListener, removePropertyChangeListener, repaint, repaint, repaint, repaint, requestFocus, requestFocus, requestFocus, requestFocus, requestFocusInWindow, requestFocusInWindow, requestFocusInWindow, reshape, revalidate, setBackground, setBounds, setBounds, setComponentOrientation, setCursor, setDropTarget, setEnabled, setFocusable, setFocusTraversalKeysEnabled, setForeground, setIgnoreRepaint, setLocale, setLocation, setLocation, setMaximumSize, setMinimumSize, setMixingCutoutShape, setName, setPreferredSize, setSize, setSize, setVisible, show, show, size, toString, transferFocus, transferFocusBackward, transferFocusUpCycle

Methods inherited from class java.lang.Object

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

Field Details

states

protected Stack states

Indicates current state where in

conds

protected Stack conds

Constructor Details

BlockStatments

public BlockStatments()

Method Details

main

public static void main(String[] args)

Creates a new Console object and calls run()

testSpecialCommands

public boolean testSpecialCommands(String command)

Catches macros which are not handled by JEP

Overrides:

testSpecialCommands in class Console

Parameters:

command -

Returns:

false - stops further processing of the line

See Also:

• Console.split(String)

processEquation

public void processEquation(Node node)
                     throws ParseException

Evaluates a node, but only if the state corresponds to the conditionValue. Also saves the result of evaluation in conditionValue for use in subsequent calls

Overrides:

processEquation in class Console

Parameters:

node - Node representing expression

Throws:

ParseException - if a Parse or evaluation error

printIntroText

public void printIntroText()

Prints introductory text.

Overrides:

printIntroText in class Console

getPrompt

public String getPrompt()

Description copied from class: Console

Prints the prompt string.

Overrides:

getPrompt in class Console

printHelp

public void printHelp()

Description copied from class: Console

Print help message.

Overrides:

printHelp in class Console