"""This is a substantially improved version of the older Interpreter.py demoIt creates a simple GUI JPython console window with simple historyas well as the ability to interupt running code (with the ESC key).Like Interpreter.py, this is still just a demo, and needs substantialwork before serious use.Thanks to Geza Groma (groma@everx.szbk.u-szeged.hu) for several valuableideas for this tool -- his JPConsole is a more refined implementationof similar ideas."""from Styles import Stylesfrom Keymap import Keymapfrom pawt import swing, colorsfrom java.awt.event.KeyEvent import VK_UP, VK_DOWNfrom java.awt.event import ActionEventfrom java.lang import Thread, Systemfrom code import compile_commandimport string, sys, reclass OutputBuffer:	def __init__(self, console, stylename):		self.console = console		self.stylename = stylename			def flush(self):		pass			def write(self, text):		self.console.write(text, self.stylename)class Console:	def __init__(self, styles=None, keymap=None):		if styles is None:			styles = Styles()			basic = styles.add('normal', tabsize=3, fontSize=12, fontFamily="Courier")			styles.add('error', parent=basic, foreground=colors.red)			styles.add('output', parent=basic, foreground=colors.blue)			styles.add('input', parent=basic, foreground=colors.black)			styles.add('prompt', parent=basic, foreground=colors.purple)		self.styles = styles				# This is a hack to get at an inner class		# This will not be required in JPython-1.1		ForegroundAction = getattr(swing.text, 'StyledEditorKit$ForegroundAction')		self.inputAction = ForegroundAction("start input", colors.black)		if keymap is None:			keymap = Keymap()		keymap.bind('enter', self.enter)		keymap.bind('tab', self.tab)		keymap.bind('escape', self.escape)		keymap.bind('up', self.uphistory)		keymap.bind('down', self.downhistory)				self.keymap = keymap				self.document = swing.text.DefaultStyledDocument(self.styles)		self.document.setLogicalStyle(0, self.styles.get('normal'))		self.textpane = swing.JTextPane(self.document)		self.textpane.keymap = self.keymap				self.history = []		self.oldHistoryLength = 0		self.historyPosition = 0				self.command = []		self.locals = {}	def write(self, text, stylename='normal'):		style = self.styles.get(stylename)		self.document.insertString(self.document.length, text, style)			def beep(self):		self.textpane.toolkit.beep()	def startUserInput(self, prompt=None):		if prompt is not None:			self.write(prompt, 'prompt')		self.startInput = self.document.createPosition(self.document.length-1)		#self.document.setCharacterAttributes(self.document.length-1, 1, self.styles.get('input'), 1)		self.textpane.caretPosition = self.document.length		ae = ActionEvent(self.textpane, ActionEvent.ACTION_PERFORMED, 'start input')		self.inputAction.actionPerformed(ae)	def getinput(self):		offset = self.startInput.offset		line = self.document.getText(offset+1, self.document.length-offset)		return string.rstrip(line)	def replaceinput(self, text):		offset = self.startInput.offset + 1		self.document.remove(offset, self.document.length-offset)		self.write(text, 'input')			def enter(self):		line = self.getinput()		self.write('\n', 'input')				self.history.append(line)		self.handleLine(line)			def gethistory(self, direction):		historyLength = len(self.history)		if self.oldHistoryLength < historyLength:			# new line was entered after last call			self.oldHistoryLength = historyLength			if self.history[self.historyPosition] != self.history[-1]:				self.historyPosition = historyLength		pos = self.historyPosition + direction		if 0 <= pos < historyLength:			self.historyPosition = pos			self.replaceinput(self.history[pos])		else:			self.beep()	def uphistory(self):		self.gethistory(-1)	def downhistory(self):		self.gethistory(1)	def tab(self):		self.write('\t', 'input')			def escape(self):		if (not hasattr(self, 'pythonThread') or self.pythonThread is None or				not self.pythonThread.alive):			self.beep()			return					self.pythonThread.stopPython()	def capturePythonOutput(self, stdoutStyle='output', stderrStyle='error'):		import sys		sys.stdout = OutputBuffer(self, stdoutStyle)		sys.stderr = OutputBuffer(self, stderrStyle)	def handleLine(self, text):		self.command.append(text)				try:			code = compile_command(string.join(self.command, '\n'))		except SyntaxError:			traceback.print_exc(0)			self.command = []			self.startUserInput(str(sys.ps1)+'\t')			return		if code is None:			self.startUserInput(str(sys.ps2)+'\t')			return				self.command = []				pt = PythonThread(code, self)		self.pythonThread = pt		pt.start()			def newInput(self):		self.startUserInput(str(sys.ps1)+'\t')		import tracebackclass PythonThread(Thread):	def __init__(self, code, console):		self.code = code		self.console = console		self.locals = console.locals			def run(self):		try:			exec self.code in self.locals					#Include these lines to actually exit on a sys.exit() call		#except SystemExit, value:		#	raise SystemExit, value				except:			exc_type, exc_value, exc_traceback = sys.exc_info()			l = len(traceback.extract_tb(sys.exc_traceback))			try:				1/0			except:				m = len(traceback.extract_tb(sys.exc_traceback))			traceback.print_exception(exc_type, exc_value, exc_traceback, l-m)					self.console.newInput()	def stopPython(self):		#Should spend 2 seconds trying to kill thread in nice Python style first...		self.stop()header = """\JPython %(version)s on %(platform)s%(copyright)s""" % {'version':sys.version, 'platform':sys.platform, 'copyright':sys.copyright}if __name__ == '__main__':	c = Console()	pane = swing.JScrollPane(c.textpane)	swing.test(pane, size=(500,400), name='JPython Console')	c.write(header, 'output')	c.capturePythonOutput()	c.textpane.requestFocus()	c.newInput()