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testSimpleConsole.py
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import sys, os
import traceback
from PyQt4 import QtCore
from PyQt4 import QtGui
class Console(QtGui.QPlainTextEdit):
def __init__(self, prompt='Command> ', startup_message='Command> ', parent=None):
QtGui.QPlainTextEdit.__init__(self, parent)
self.prompt = prompt
self.parent = parent
self.history = []
self.namespace = {}
self.construct = []
self.setGeometry(50, 75, 600, 400)
self.setWordWrapMode(QtGui.QTextOption.WrapAnywhere)
self.setUndoRedoEnabled(False)
self.document().setDefaultFont(QtGui.QFont("monospace", 10, QtGui.QFont.Normal))
self.showMessage(startup_message)
def updateNamespace(self, namespace):
self.namespace.update(namespace)
def showMessage(self, message):
self.appendPlainText(message)
# self.newPrompt()
def newPrompt(self):
if self.construct:
prompt = '.' * len(self.prompt)
else:
prompt = self.prompt
self.appendPlainText(prompt)
self.moveCursor(QtGui.QTextCursor.End)
def getCommand(self):
doc = self.document()
curr_line = str(doc.findBlockByLineNumber(doc.lineCount() - 1).text())
curr_line = curr_line.rstrip()
curr_line = curr_line[len(self.prompt):]
return curr_line
def setCommand(self, command):
if self.getCommand() == command:
return
self.moveCursor(QtGui.QTextCursor.End)
self.moveCursor(QtGui.QTextCursor.StartOfLine, QtGui.QTextCursor.KeepAnchor)
for i in range(len(self.prompt)):
self.moveCursor(QtGui.QTextCursor.Right, QtGui.QTextCursor.KeepAnchor)
self.textCursor().removeSelectedText()
self.textCursor().insertText(command)
self.moveCursor(QtGui.QTextCursor.End)
def getConstruct(self, command):
if self.construct:
prev_command = self.construct[-1]
self.construct.append(command)
if not prev_command and not command:
ret_val = '\n'.join(self.construct)
self.construct = []
return ret_val
else:
return ''
else:
if command and command[-1] == (':'):
self.construct.append(command)
return ''
else:
return command
def getHistory(self):
return self.history
def setHisory(self, history):
self.history = history
def addToHistory(self, command):
if command and (not self.history or self.history[-1] != command):
self.history.append(command)
self.history_index = len(self.history)
def getPrevHistoryEntry(self):
if self.history:
self.history_index = max(0, self.history_index - 1)
return self.history[self.history_index]
return ''
def getNextHistoryEntry(self):
if self.history:
hist_len = len(self.history)
self.history_index = min(hist_len, self.history_index + 1)
if self.history_index < hist_len:
return self.history[self.history_index]
return ''
def getCursorPosition(self):
return self.textCursor().columnNumber() - len(self.prompt)
def setCursorPosition(self, position):
self.moveCursor(QtGui.QTextCursor.StartOfLine)
for i in range(len(self.prompt) + position):
self.moveCursor(QtGui.QTextCursor.Right)
def runCommand(self):
command = self.getCommand()
comm_s = str(command)
if (comm_s != ""):
self.addToHistory(command)
self.parent.send_to_server(comm_s)
# self.newPrompt()
return
command = self.getConstruct(comm_s[1:len(comm_s)])
if command:
tmp_stdout = sys.stdout
class stdoutProxy():
def __init__(self, write_func):
self.write_func = write_func
self.skip = False
def write(self, text):
if not self.skip:
stripped_text = text.rstrip('\n')
self.write_func(stripped_text)
QtCore.QCoreApplication.processEvents()
self.skip = not self.skip
sys.stdout = stdoutProxy(self.appendPlainText)
try:
try:
result = eval(command, self.namespace, self.namespace)
if result != None:
self.appendPlainText(repr(result))
except SyntaxError:
exec(command, self.namespace)
except SystemExit:
self.close()
except:
traceback_lines = traceback.format_exc().split('\n')
# Remove traceback mentioning this file, and a linebreak
for i in (3,2,1,-1):
traceback_lines.pop(i)
self.appendPlainText('\n'.join(traceback_lines))
sys.stdout = tmp_stdout
def keyPressEvent(self, event):
if event.key() in (QtCore.Qt.Key_Enter, QtCore.Qt.Key_Return):
self.runCommand()
return
if event.key() == QtCore.Qt.Key_Home:
self.setCursorPosition(0)
return
if event.key() == QtCore.Qt.Key_PageUp:
return
elif event.key() in (QtCore.Qt.Key_Left, QtCore.Qt.Key_Backspace):
if self.getCursorPosition() == 0:
return
elif event.key() == QtCore.Qt.Key_Up:
self.setCommand(self.getPrevHistoryEntry())
return
elif event.key() == QtCore.Qt.Key_Down:
self.setCommand(self.getNextHistoryEntry())
return
elif event.key() == QtCore.Qt.Key_D and event.modifiers() == QtCore.Qt.ControlModifier:
self.close()
super(Console, self).keyPressEvent(event)
welcome_message = '''
---------------------------------------------------------------
Welcome to a primitive Python interpreter.
---------------------------------------------------------------
'''
if __name__ == '__main__':
app = QtGui.QApplication(sys.argv)
console = Console(startup_message=welcome_message)
console.updateNamespace({'myVar1' : app, 'myVar2' : 1234})
console.show();
sys.exit(app.exec_())