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Conflict + Update the file and copyright details
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‎src/simplejavatexteditor/AutoComplete.java

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package simplejavatexteditor;
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import java.awt.event.ActionEvent;
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import java.awt.event.KeyEvent;
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import java.awt.event.KeyListener;
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import java.util.ArrayList;
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import java.util.Collections;
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import javax.swing.AbstractAction;
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import javax.swing.ActionMap;
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import javax.swing.InputMap;
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import javax.swing.JTextArea;
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import javax.swing.KeyStroke;
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import javax.swing.SwingUtilities;
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import javax.swing.event.DocumentEvent;
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import javax.swing.event.DocumentListener;
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import javax.swing.text.BadLocationException;
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/**
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* <h1>Auto complete functionality multiple programming languages, including brackets and
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* parentheses</h1>
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*
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* <p>
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* An ArrayList is created for the keywords and the brackets.
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* Logic for setting the content of the ArrayList is
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* found in UI.java. If the word currently being typed
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* matches a word in the list, a Runnable inner class is
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* implemented to handle the word completion.
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*
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* Two other inner classes are also used. The second one handles when the enter
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* key is pressed in response to an auto complete suggestion. The third one
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* performs additional logic on brackets.
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* </p>
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*
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*
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* @author Patrick Slagle
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* @since 2016-12-03
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*/
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public class AutoComplete
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implements DocumentListener {
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private ArrayList<String> brackets = new ArrayList<>();
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private ArrayList<String> bracketCompletions = new ArrayList<>();
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private ArrayList<String> words = new ArrayList<>();
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SupportedKeywords kw;
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//Keep track of when code completion
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//has been activated
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private enum Mode {
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INSERT, COMPLETION
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};
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private final UI ui;
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private Mode mode = Mode.INSERT;
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private final JTextArea textArea;
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private static final String COMMIT_ACTION = "commit";
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private boolean isKeyword;
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private int pos;
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private String content;
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public AutoComplete(UI ui, ArrayList<String> al) {
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//Set the keywords
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words = al;
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kw = new SupportedKeywords();
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brackets = kw.getbrackets();
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bracketCompletions = kw.getbracketCompletions();
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//Access the editor
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this.ui = ui;
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textArea = ui.getEditor();
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//Set the handler for the enter key
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InputMap im = textArea.getInputMap();
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ActionMap am = textArea.getActionMap();
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im.put(KeyStroke.getKeyStroke("ENTER "), COMMIT_ACTION);
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am.put(COMMIT_ACTION, new CommitAction());
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Collections.sort(words);
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}
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/**
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* A character has been typed into the document.
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* This method performs the primary
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* check to find a keyword completion.
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*
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* @param e
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*/
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@Override
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public void insertUpdate(DocumentEvent e) {
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pos = e.getOffset();
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content = null;
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try {
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content = textArea.getText(0, pos + 1);
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} catch (BadLocationException ex) {
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ex.printStackTrace();
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}
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if (e.getLength() != 1) {
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return;
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}
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//Before checking for a keyword
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checkForBracket();
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//Get the beginning of the word being typed
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int start;
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for (start = pos; start >= 0; start--) {
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if (!Character.isLetter(content.charAt(start))) {
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break;
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}
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}
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//Auto complete will start
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//after two characters are typed
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if (pos - start < 2) {
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return;
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}
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//Search for a match on the word being typed
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//in the keywords ArrayList
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String prefix = content.substring(start + 1);
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int n = Collections.binarySearch(words, prefix);
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if (n < 0 && -n < words.size()) {
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String match = words.get(-n - 1);
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if (match.startsWith(prefix)) {
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String completion = match.substring(pos - start);
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isKeyword = true;
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SwingUtilities.invokeLater(
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new CompletionTask(completion, pos + 1));
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} else {
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mode = Mode.INSERT;
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}
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}
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}
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/**
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* Performs a check to see if the last
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* key typed was one of the supported
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* bracket characters
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*/
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private void checkForBracket() {
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//String of the last typed character
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char c = content.charAt(pos);
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String s = String.valueOf(c);
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for (int i = 0; i < brackets.size(); i++) {
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if (brackets.get(i).equals(s)) {
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isKeyword = false;
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SwingUtilities.invokeLater(
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new CompletionTask(bracketCompletions.get(i), pos + 1));
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}
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}
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}
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/**
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* So that future classes can view the keyword list in the future.
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*
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* @return the keywords
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*/
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private ArrayList<String> getKeywords() {
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return words;
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}
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/**
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* So that these keywords can be modified or added to in the future.
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*
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* @param keyword the keyword to set
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*/
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private void setKeywords(String keyword) {
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words.add(keyword);
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}
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/**
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* Handles the auto complete suggestion
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* generated when the user is typing a
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* word that matches a keyword.
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*/
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private class CompletionTask
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implements Runnable {
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private final String completion;
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private final int position;
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public CompletionTask(String completion, int position) {
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this.completion = completion;
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this.position = position;
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}
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@Override
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public void run() {
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textArea.insert(completion, position);
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textArea.setCaretPosition(position + completion.length());
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textArea.moveCaretPosition(position);
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mode = Mode.COMPLETION;
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if (!isKeyword) {
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textArea.addKeyListener(new HandleBracketEvent());
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}
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}
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}
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/**
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* Enter key is pressed in response to an
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* auto complete suggestion. Respond
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* appropriately.
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*/
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private class CommitAction
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extends AbstractAction {
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@Override
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public void actionPerformed(ActionEvent e) {
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if (mode == Mode.COMPLETION) {
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int pos = textArea.getSelectionEnd();
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if (isKeyword) {
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textArea.insert(" ", pos);
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textArea.setCaretPosition(pos + 1);
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mode = Mode.INSERT;
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}
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} else {
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mode = Mode.INSERT;
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textArea.replaceSelection("\n");
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}
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}
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}
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/**
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* Additional logic for bracket auto complete
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*/
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private class HandleBracketEvent
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implements KeyListener {
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@Override
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public void keyTyped(KeyEvent e) {
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//Bracket auto complete needs special attention.
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//Multiple possible responses are needed.
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String keyEvent = String.valueOf(e.getKeyChar());
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for (String bracketCompletion : bracketCompletions) {
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if (keyEvent.equals(bracketCompletion)) {
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textArea.replaceRange("", pos, pos + 1);
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mode = Mode.INSERT;
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textArea.removeKeyListener(this);
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}
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}
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int currentPosition = textArea.getCaretPosition();
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switch (e.getKeyChar()) {
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case '\n':
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textArea.insert("\n\n", currentPosition);
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textArea.setCaretPosition(currentPosition + 1);
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mode = Mode.INSERT;
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textArea.removeKeyListener(this);
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break;
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default:
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textArea.setCaretPosition(pos);
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mode = Mode.INSERT;
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textArea.removeKeyListener(this);
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break;
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}
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}
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@Override
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public void keyPressed(KeyEvent e) {
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}
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@Override
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public void keyReleased(KeyEvent e) {
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}
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}
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@Override
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public void removeUpdate(DocumentEvent e) {
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}
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@Override
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public void changedUpdate(DocumentEvent e) {
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}
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}

‎src/simplejavatexteditor/SupportedKeywords.java

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package simplejavatexteditor;
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import java.util.ArrayList;
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/**
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* <h1>A class to store the programming language keywords and
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* provide access to them.</h1>
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*
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* <p>Makes multiple language support possible and makes adding new language
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* support convenient. To add more keywords, add a string array and getters
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* to this class. Then, update the switch statement in UI.java.</p>
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*/
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public class SupportedKeywords {
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private String[] java = {"abstract", "assert", "boolean",
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"break", "byte", "case", "catch", "char", "class", "const",
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"continue", "default", "do", "double", "else", "extends", "false",
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"final", "finally", "float", "for", "goto", "if", "implements",
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"import", "instanceof", "int", "System", "out", "print()", "println()",
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"new", "null", "package", "private", "protected", "public", "interface",
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"long", "native", "return", "short", "static", "strictfp", "super", "switch",
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"synchronized", "this", "throw", "throws", "transient", "true",
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"try", "void", "volatile", "while", "String"};
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private String[] cpp = { "auto", "const", "double", "float", "int", "short",
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"struct", "unsigned", "break", "continue", "else", "for", "long", "signed",
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"switch", "void", "case", "default", "enum", "goto", "register", "sizeof",
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"typedef", "volatile", "char", "do", "extern", "if", "return", "static",
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"union", "while", "asm", "dynamic_cast", "namespace", "reinterpret_cast", "try",
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"bool", "explicit", "new", "static_cast", "typeid", "catch", "false", "operator",
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"template", "typename", "class", "friend", "private", "this", "using", "const_cast",
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"inline", "public", "throw", "virtual", "delete", "mutable", "protected", "true", "wchar_t" };
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private String[] brackets = { "{", "(" };
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private String[] bCompletions = { "}", ")" };
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public String[] getJavaKeywords() {
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return java;
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}
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public String[] getCppKeywords() {
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return cpp;
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}
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public ArrayList<String> getbracketCompletions() {
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ArrayList<String> al = new ArrayList<>();
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for(String completion : bCompletions) {
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al.add(completion);
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}
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return al;
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}
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public ArrayList<String> getbrackets() {
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ArrayList<String> al = new ArrayList<>();
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for(String completion : brackets) {
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al.add(completion);
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}
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return al;
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}
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public ArrayList<String> setKeywords(String[] arr) {
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ArrayList<String> al = new ArrayList<>();
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for(String words : arr) {
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al.add(words);
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}
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return al;
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}
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}

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