private void updateDisplay() {
// first, set block colours
textView.setBackground(getColour(backgroundColour("text-background-colour")));
textView.setForeground(getColour(foregroundColour("text-foreground-colour")));
textView.setCaretColor(getColour(foregroundColour("text-caret-colour")));
problemsView.setBackground(getColour(backgroundColour("problems-background-colour")));
problemsView.setForeground(getColour(foregroundColour("problems-foreground-colour")));
consoleView.setBackground(getColour(backgroundColour("console-background-colour")));
consoleView.setForeground(getColour(foregroundColour("console-foreground-colour")));
// second, set colours on the code!
java.util.List<Lexer.Token> tokens = Lexer.tokenise(textView.getText(), true);
int pos = 0;
for (Lexer.Token t : tokens) {
int len = t.toString().length();
if (t instanceof Lexer.RightBrace || t instanceof Lexer.LeftBrace) {
highlightArea(pos, len, foregroundColour("text-brace-colour"));
} else if (t instanceof Lexer.Strung) {
highlightArea(pos, len, foregroundColour("text-string-colour"));
} else if (t instanceof Lexer.Comment) {
highlightArea(pos, len, foregroundColour("text-comment-colour"));
} else if (t instanceof Lexer.Quote) {
highlightArea(pos, len, foregroundColour("text-quote-colour"));
} else if (t instanceof Lexer.Comma) {
highlightArea(pos, len, foregroundColour("text-comma-colour"));
} else if (t instanceof Lexer.Identifier) {
highlightArea(pos, len, foregroundColour("text-identifier-colour"));
} else if (t instanceof Lexer.Integer) {
highlightArea(pos, len, foregroundColour("text-integer-colour"));
}
pos += len;
}
}
public void prettyPrint() {
try {
// clear old problem messages
problemsView.setText("");
// update status view
statusView.setText(" Parsing ...");
LispExpr root = Parser.parse(textView.getText());
statusView.setText(" Pretty Printing ...");
String newText = PrettyPrinter.prettyPrint(root);
textView.setText(newText);
statusView.setText(" Done.");
} catch (Error e) {
System.err.println(e.getMessage());
statusView.setText(" Errors.");
}
}
public void evaluate() {
try {
// clear problems and console messages
problemsView.setText("");
consoleView.setText("");
// update status view
statusView.setText(" Parsing ...");
tabbedPane.setSelectedIndex(0);
LispExpr root = Parser.parse(textView.getText());
statusView.setText(" Running ...");
tabbedPane.setSelectedIndex(1);
// update run button
runButton.setIcon(stopImage);
runButton.setActionCommand("Stop");
// start run thread
runThread = new RunThread(root);
runThread.start();
} catch (SyntaxError e) {
tabbedPane.setSelectedIndex(0);
System.err.println(
"Syntax Error at " + e.getLine() + ", " + e.getColumn() + " : " + e.getMessage());
} catch (Error e) {
// parsing error
System.err.println(e.getMessage());
statusView.setText(" Errors.");
}
}
private boolean checkForSave() {
// build warning message
String message;
if (file == null) {
message = "File has been modified. Save changes?";
} else {
message = "File \"" + file.getName() + "\" has been modified. Save changes?";
}
// show confirm dialog
int r =
JOptionPane.showConfirmDialog(
this,
new JLabel(message),
"Warning!",
JOptionPane.YES_NO_CANCEL_OPTION,
JOptionPane.WARNING_MESSAGE);
if (r == JOptionPane.YES_OPTION) {
// Save File
if (fileChooser.showSaveDialog(this) == JFileChooser.APPROVE_OPTION) {
// write the file
physWriteTextFile(fileChooser.getSelectedFile(), textView.getText());
} else {
// user cancelled save after all
return false;
}
}
return r != JOptionPane.CANCEL_OPTION;
}
public void unbindKey(String keySequence) {
KeyStroke ks = KeyStroke.getKeyStroke(keySequence);
if (ks == null) {
throw new Error("Invalid key sequence \"" + keySequence + "\"");
}
textView.getKeymap().removeKeyStrokeBinding(ks);
}
public void bindKeyToCommand(String keySequence, LispExpr cmd) {
// see Java API for info on keySequence format
KeyStroke ks = KeyStroke.getKeyStroke(keySequence);
if (ks == null) {
throw new Error("Invalid key sequence \"" + keySequence + "\"");
}
textView.getKeymap().addActionForKeyStroke(ks, new KeyAction(cmd));
}
public void newFile() {
if (!dirty || checkForSave()) {
textView.setText("");
consoleView.setText("");
problemsView.setText("");
statusView.setText(" Created new file.");
file = null;
// reset dirty bit
dirty = false;
}
}
public void saveFile() {
if (file == null) {
// first save file, so prompt for name.
saveFileAs();
} else {
// file already named so just write it.
physWriteTextFile(file, textView.getText());
// update status
statusView.setText(" Saved file \"" + file.getName() + "\".");
// reset dirty bit
dirty = false;
}
}
public void saveFileAs() {
// Force user to enter new file name
if (fileChooser.showSaveDialog(this) == JFileChooser.APPROVE_OPTION) {
file = fileChooser.getSelectedFile();
} else {
// user cancelled save after all
return;
}
// file selected, so write it.
physWriteTextFile(file, textView.getText());
// update status
statusView.setText(" Saved file \"" + file.getName() + "\".");
// reset dirty bit
dirty = false;
}
public void caretUpdate(CaretEvent e) {
// when the cursor moves on _textView
// this method will be called. Then, we
// must determine what the line number is
// and update the line number view
Element root = textView.getDocument().getDefaultRootElement();
int line = root.getElementIndex(e.getDot());
root = root.getElement(line);
int col = root.getElementIndex(e.getDot());
lineNumberView.setText(line + ":" + col);
// if text is selected then enable copy and cut
boolean isSelection = e.getDot() != e.getMark();
copyAction.setEnabled(isSelection);
cutAction.setEnabled(isSelection);
}
public void openFile() {
if (!dirty || checkForSave()) {
if (fileChooser.showOpenDialog(this) == JFileChooser.APPROVE_OPTION) {
file = fileChooser.getSelectedFile();
} else {
// user cancelled open after all
return;
}
// load file into text view
textView.setText(physReadTextFile(file));
// update status
statusView.setText(" Loaded file \"" + file.getName() + "\".");
// reset dirty bit
dirty = false;
}
}
public void actionPerformed(ActionEvent e) {
textView.copy();
}
private JTextPane buildEditor() {
// build the editor pane
JTextPane ta = makeTextPane(true);
ta.setBorder(BorderFactory.createEmptyBorder(2, 5, 2, 5));
return ta;
}
public void setCaretPosition(int position) {
Caret c = textView.getCaret();
// move the caret
c.setDot(position);
}
public int getCaretPosition() {
Caret c = textView.getCaret();
return c.getDot();
}
public void cut() {
textView.cut();
}
private JTextPane makeTextPane(boolean editable) {
document = new DefaultStyledDocument();
JTextPane ta = new JTextPane(document);
ta.setEditable(editable);
return ta;
}
public void actionPerformed(ActionEvent e) {
textView.paste();
}
public void copy() {
textView.copy();
}
public void paste() {
textView.paste();
}
public InterpreterFrame() {
super("Simple Lisp Interpreter");
// Create the menu
menubar = buildMenuBar();
setJMenuBar(menubar);
// Create the toolbar
toolbar = buildToolBar();
// disable cut and copy actions
cutAction.setEnabled(false);
copyAction.setEnabled(false);
// Setup text area for editing source code
// and setup document listener so interpreter
// is notified when current file modified and
// when the cursor is moved.
textView = buildEditor();
textView.getDocument().addDocumentListener(this);
textView.addCaretListener(this);
// set default key bindings
bindKeyToCommand("ctrl C", "(buffer-copy)");
bindKeyToCommand("ctrl X", "(buffer-cut)");
bindKeyToCommand("ctrl V", "(buffer-paste)");
bindKeyToCommand("ctrl E", "(buffer-eval)");
bindKeyToCommand("ctrl O", "(file-open)");
bindKeyToCommand("ctrl S", "(file-save)");
bindKeyToCommand("ctrl Q", "(exit)");
// Give text view scrolling capability
Border border =
BorderFactory.createCompoundBorder(
BorderFactory.createEmptyBorder(3, 3, 3, 3),
BorderFactory.createLineBorder(Color.gray));
JScrollPane topSplit = addScrollers(textView);
topSplit.setBorder(border);
// Create tabbed pane for console/problems
consoleView = makeConsoleArea(10, 50, true);
problemsView = makeConsoleArea(10, 50, false);
tabbedPane = buildProblemsConsole();
// Plug the editor and problems/console together
// using a split pane. This allows one to change
// their relative size using the split-bar in
// between them.
splitPane = new JSplitPane(JSplitPane.VERTICAL_SPLIT, topSplit, tabbedPane);
// Create status bar
statusView = new JLabel(" Status");
lineNumberView = new JLabel("0:0");
statusbar = buildStatusBar();
// Now, create the outer panel which holds
// everything together
outerpanel = new JPanel();
outerpanel.setLayout(new BorderLayout());
outerpanel.add(toolbar, BorderLayout.PAGE_START);
outerpanel.add(splitPane, BorderLayout.CENTER);
outerpanel.add(statusbar, BorderLayout.SOUTH);
getContentPane().add(outerpanel);
// tell frame to fire a WindowsListener event
// but not to close when "x" button clicked.
setDefaultCloseOperation(DO_NOTHING_ON_CLOSE);
addWindowListener(this);
// set minimised icon to use
setIconImage(makeImageIcon("spi.png").getImage());
// setup additional internal functions
InternalFunctions.setup_internals(interpreter, this);
// set default window size
Component top = splitPane.getTopComponent();
Component bottom = splitPane.getBottomComponent();
top.setPreferredSize(new Dimension(100, 400));
bottom.setPreferredSize(new Dimension(100, 200));
pack();
// load + run user configuration file (if there is one)
String homedir = System.getProperty("user.home");
try {
interpreter.load(homedir + "/.simplelisp");
} catch (FileNotFoundException e) {
// do nothing if file does not exist!
System.out.println("Didn't find \"" + homedir + "/.simplelisp\"");
}
textView.grabFocus();
setVisible(true);
// redirect all I/O to problems/console
redirectIO();
// start highlighter thread
highlighter = new DisplayThread(250);
highlighter.setDaemon(true);
highlighter.start();
}