public void actionPerformed(ActionEvent a) {
String command = a.getActionCommand();
if (command.equals("e")) {
// Log toggle.
if (consoleDisplayed = !consoleDisplayed) {
splitter.add(outputScroll);
splitter.setDividerLocation(.8);
} else {
splitter.remove(outputScroll);
}
} else if (command.equals("k")) {
if (text.getText().contains("class")) {
// This means we should try to compile this as normal.
// Pulls out class name
String code = text.getText();
int firstPos = code.indexOf("class");
int secondPos = code.indexOf("{");
String name = code.substring(firstPos + "class".length() + 1, secondPos).trim();
compileAndRun(name, text.getText());
} else {
// This means we should compile this as a playground.
String code = text.getText();
// Common import statements built-in
String importDump = new String();
importDump +=
("import java.util.*;\n"
+ "import javax.swing.*;\n"
+ "import javax.swing.event.*;\n"
+ "import java.awt.*;\n"
+ "import java.awt.event.*;\n"
+ "import java.io.*;\n");
// Pulls out any "import" statements and appends them to the import dump.
int i = code.indexOf("import");
while (i >= 0) {
String s = code.substring(i, code.indexOf(";", i) + 1);
code = code.replaceFirst(s, "");
importDump += s + "\n";
i = code.indexOf("import", i + 1);
}
// Inject the class header and main method
code =
"//User and auto-imports pre-defined\n"
+ importDump
+ "//Autogenerated class\npublic class Main {\npublic static void main(String[] args) {\n"
+ code
+ "\n}\n}";
compileAndRun("Main", code);
}
}
}
// For compatibility with writers when talking to the JVM.
public void write(char[] buffer, int offset, int length) {
String text = new String(buffer, offset, length);
SwingUtilities.invokeLater(
() -> {
try {
pane.getDocument().insertString(pane.getDocument().getLength(), text, properties);
} catch (Exception e) {
}
});
}
// Appends text to the end of the log, using the provided settings. Doesn't add a new line.
private static void print(String message, SimpleAttributeSet settings) {
try {
outputText
.getDocument()
.insertString(outputText.getDocument().getLength(), message, settings);
} catch (BadLocationException e) {
try {
outputText
.getDocument()
.insertString(
outputText.getDocument().getLength(),
"Couldn't insert message \"" + message + "\".",
progErr);
} catch (BadLocationException b) {
// If you ever reach this error, something is seriously wrong, so just please swallow it and
// ignore it.
}
}
}
// This is used for when the user's code has something wrong.
// This has checks in place to make some more sense of the error messages.
// Internal errors should be logged using println and the progErr font.
private static void logError(String message) {
if (message.contains("Playground$FrameAction")) {
// This is a reflection error, so that means that we have a malformed class or method.
String code = text.getText();
if (!code.startsWith("public class")) {
println(
"Error: You defined a private class. Please use \"public class <classname>\".",
progErr);
} else {
println(
"Error: Malformed method. Make sure your main method is defined as \"public static void main(<any args>)\".",
progErr);
}
} else {
println(message, progErr);
}
}
public static void main() {
// Main
frame = new JFrame("Java Playground");
frame.setSize(640, 480);
// Make sure the divider is properly resized
frame.addComponentListener(
new ComponentAdapter() {
public void componentResized(ComponentEvent c) {
splitter.setDividerLocation(.8);
}
});
// Make sure the JVM is reset on close
frame.addWindowListener(
new WindowAdapter() {
public void windowClosed(WindowEvent w) {
new FrameAction().kill();
}
});
// Setting up the keybinding
// Ctrl+k or Cmd+k -> compile
bind(KeyEvent.VK_K);
// Ctrl+e or Cmd+e -> console
bind(KeyEvent.VK_E);
// Save, New file, Open file, Print.
// Currently UNUSED until I figure out how normal java files and playground files will
// interface.
bind(KeyEvent.VK_S);
bind(KeyEvent.VK_N);
bind(KeyEvent.VK_O);
bind(KeyEvent.VK_P);
// Binds the keys to the action defined in the FrameAction class.
frame.getRootPane().getActionMap().put("console", new FrameAction());
// The main panel for typing code in.
text = new JTextPane();
textScroll = new JScrollPane(text);
textScroll.setBorder(null);
textScroll.setPreferredSize(new Dimension(640, 480));
// Document with syntax highlighting. Currently unfinished.
doc = text.getStyledDocument();
doc.addDocumentListener(
new DocumentListener() {
public void changedUpdate(DocumentEvent d) {}
public void insertUpdate(DocumentEvent d) {}
public void removeUpdate(DocumentEvent d) {}
});
((AbstractDocument) doc).setDocumentFilter(new NewLineFilter());
// The output log; a combination compiler warning/error/runtime error/output log.
outputText = new JTextPane();
outputScroll = new JScrollPane(outputText);
outputScroll.setBorder(null);
// "Constant" for the error font
error = new SimpleAttributeSet();
error.addAttribute(StyleConstants.CharacterConstants.Italic, Boolean.TRUE);
error.addAttribute(StyleConstants.Foreground, Color.RED);
// "Constant" for the warning message font
warning = new SimpleAttributeSet();
warning.addAttribute(StyleConstants.CharacterConstants.Italic, Boolean.TRUE);
warning.addAttribute(StyleConstants.Foreground, Color.PINK);
// "Constant" for the debugger error font
progErr = new SimpleAttributeSet();
progErr.addAttribute(StyleConstants.Foreground, Color.BLUE);
// Print streams to redirect System.out and System.err.
out = new TextOutputStream(outputText, null);
err = new TextOutputStream(outputText, error);
System.setOut(new PrintStream(out));
System.setErr(new PrintStream(err));
// Sets up the output log
outputText.setEditable(false);
outputScroll.setVisible(true);
// File input/output setup
chooser = new JFileChooser();
// Setting up miscellaneous stuff
compiler = ToolProvider.getSystemJavaCompiler();
JVMrunning = false;
redirectErr = null;
redirectOut = null;
redirectIn = null;
// Sets up the splitter pane and opens the program up
splitter = new JSplitPane(JSplitPane.VERTICAL_SPLIT, textScroll, outputScroll);
consoleDisplayed = false;
splitter.remove(outputScroll); // Initially hides terminal until it is needed
splitter.setOneTouchExpandable(true);
frame.add(splitter);
frame.setVisible(true);
// Sets the divider to the proper one, for debugging
// splitter.setDividerLocation(.8);
}
public void actionPerformed(ActionEvent a) {
// Note that this only works on *nix OSes.
// For windows, get the first character of the action command, cast it to int, and compare
// that on a case-by-case basis.
String command = a.getActionCommand();
if (command.equals("e")) {
// Log toggle.
if (consoleDisplayed = !consoleDisplayed) {
splitter.add(outputScroll);
splitter.setDividerLocation(defaultSliderPosition);
} else {
splitter.remove(outputScroll);
}
} else if (command.equals("r")) {
// Gets the code into a string.
String code = text.getText();
// Marks certain areas as "dirty".
// Dirty areas are places that shouldn't be considered for any keywords,
// including "import", "extend", and so on.
ArrayList<Integer> dirtyBounds = getDirty(code);
if (text.getText().contains("class")) {
// This means we should try to compile this as normal.
// Pulls out class name
int firstPos = code.indexOf("public class");
int secondPos = code.indexOf("{");
String name = code.substring(firstPos + "public class".length() + 1, secondPos).trim();
// Just a safety check to make sure you don't try to modify this program while it's
// running.
if (name.equals("Playground")) {
System.out.println(
"I know what you're doing and I don't approve. I won't even compile that.");
return;
}
compileAndRun(name, code);
} else {
// This means we should compile this as a playground.
// Common import statements built-in
String importDump = new String();
importDump +=
( // "import java.util.*;\n" +
"import javax.swing.*;\n"
+ "import javax.swing.event.*;\n"
+ "import java.awt.*;\n"
+ "import java.awt.event.*;\n"
+ "import java.io.*;\n");
// User-defined or auto-generated methods
String methodDump = new String();
// dirtyBounds.forEach(System.out::println);
// Pulls out any "import" statements and appends them to the import dump.
int i = code.indexOf("import");
while (i >= 0) {
// Ignores comments and string literals
if (isDirty(dirtyBounds, i)) {
i = code.indexOf("import", i + 1);
continue;
}
String s = code.substring(i, code.indexOf(";", i) + 1);
// System.out.println("Found import: " + s);
code = code.replaceFirst(s, "");
importDump += s + "\n";
i = code.indexOf("import", i + 1);
}
// Pulls out methods- these are defined by the keyword "method" until a closing bracket.
/*
i = code.indexOf("method");
while(i >= 0) {
//Ignores comments and string literals
if (isDirty(dirtyBounds, i)) {
i = code.indexOf("method", i+1);
continue;
}
//This scans from the first '{' until the last '}' to pull out the full method declaration.
char temp = 0;
int pos = code.indexOf("{", i+1), count = 1;
if(pos != -1) {
while(++pos < code.length()) {
if (count == 0)
break;
temp = code.charAt(pos);
if (temp == '{')
count++;
if (temp == '}')
count--;
}
} else {
//Missing an opening bracket, so just remove "method" and hope it compiles.
code = code.replaceFirst("method", "");
i = code.indexOf("method", i+1);
continue;
}
String s = code.substring(i, pos);
//System.out.println("Found method: " + s);
code = code.replace(s, "");
methodDump+=(s.replaceFirst("method ", "static ")) + "\n";
i = code.indexOf("method", i+1);
}*/
// Pulls out all methods
i = code.indexOf("(");
while (i >= 0) {
if (isDirty(dirtyBounds, i)) {
i = code.indexOf("(", i + 1);
continue;
}
// Move backwards first
char temp = 0;
int pos = i;
boolean shouldSkip = false;
while (--pos > 0) {
temp = code.charAt(pos);
if (temp == '.') {
shouldSkip = true;
break;
} // This is a method call, ie String.charAt();
if (temp == ';') {
++pos;
break;
} // This is most likely a method declaration, since we had no errors
// If we hit the start of the file, that's probable a method dec. too!
}
if (shouldSkip || isDirty(dirtyBounds, pos)) {
i = code.indexOf("(", i + 1);
continue;
} // If this def. isn't a method or it's in a comment
int start = pos;
temp = 0;
pos = code.indexOf("{", i + 1);
int count = 1;
if (pos != -1) {
while (++pos < code.length()) {
if (count == 0) break;
temp = code.charAt(pos);
if (temp == '{') count++;
if (temp == '}') count--;
}
} else {
i = code.indexOf("(", i + 1);
continue;
}
int end = pos;
String s = code.substring(start, end);
code = code.replace(s, "");
// Just to make it look nicer
s = s.trim();
System.out.println("Found method: " + s);
methodDump += (s + "\n");
i = code.indexOf("(", i + 1);
}
// Inject the class header and main method, imports, and methods
code =
"//User and auto-imports pre-defined\n"
+ importDump
+ "//Autogenerated class\n"
+ "public class Main {\n"
+ "public static void main(String[] args) {\n"
+ code
+ "}\n"
+ methodDump
+ "}";
// Run as normal
compileAndRun("Main", code);
}
} else if (command.equals("k")) {
kill();
} else if (command.equals("o")) {
new OptionFrame(frame);
} else if (command.equals("/")) {
new HelpFrame(frame);
}
}