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import code, sys, traceback
from ..Qt import QtWidgets, QtGui, QtCore
from ..functions import mkBrush
from .CmdInput import CmdInput
class ReplWidget(QtWidgets.QWidget):
sigCommandEntered = QtCore.Signal(object, object) # self, command
sigCommandRaisedException = QtCore.Signal(object, object) # self, exc
def __init__(self, globals, locals, parent=None):
self.globals = globals
self.locals = locals
self._lastCommandRow = None
self._commandBuffer = [] # buffer to hold multiple lines of input
self.stdoutInterceptor = StdoutInterceptor(self.write)
self.ps1 = ">>> "
self.ps2 = "... "
QtWidgets.QWidget.__init__(self, parent=parent)
self._setupUi()
# define text styles
isDark = self.output.palette().color(QtGui.QPalette.ColorRole.Base).value() < 128
outputBlockFormat = QtGui.QTextBlockFormat()
outputFirstLineBlockFormat = QtGui.QTextBlockFormat(outputBlockFormat)
outputFirstLineBlockFormat.setTopMargin(5)
outputCharFormat = QtGui.QTextCharFormat()
outputCharFormat.setFontWeight(QtGui.QFont.Weight.Normal)
cmdBlockFormat = QtGui.QTextBlockFormat()
cmdBlockFormat.setBackground(mkBrush("#335" if isDark else "#CCF"))
cmdCharFormat = QtGui.QTextCharFormat()
cmdCharFormat.setFontWeight(QtGui.QFont.Weight.Bold)
self.textStyles = {
'command': (cmdCharFormat, cmdBlockFormat),
'output': (outputCharFormat, outputBlockFormat),
'output_first_line': (outputCharFormat, outputFirstLineBlockFormat),
}
self.input.ps1 = self.ps1
self.input.ps2 = self.ps2
def _setupUi(self):
self.layout = QtWidgets.QVBoxLayout(self)
self.layout.setContentsMargins(0, 0, 0, 0)
self.layout.setSpacing(0)
self.setLayout(self.layout)
self.output = QtWidgets.QTextEdit(self)
font = QtGui.QFont()
font.setFamily("Courier New")
font.setStyleStrategy(QtGui.QFont.StyleStrategy.PreferAntialias)
self.output.setFont(font)
self.output.setReadOnly(True)
self.layout.addWidget(self.output)
# put input box in a horizontal layout so we can easily place buttons at the end
self.inputWidget = QtWidgets.QWidget(self)
self.layout.addWidget(self.inputWidget)
self.inputLayout = QtWidgets.QHBoxLayout()
self.inputWidget.setLayout(self.inputLayout)
self.inputLayout.setContentsMargins(0, 0, 0, 0)
self.input = CmdInput(parent=self)
self.inputLayout.addWidget(self.input)
self.input.sigExecuteCmd.connect(self.runCmd)
def runCmd(self, cmd):
if '\n' in cmd:
for line in cmd.split('\n'):
self.runCmd(line)
return
if len(self._commandBuffer) == 0:
self.write(f"{self.ps1}{cmd}\n", style='command')
else:
self.write(f"{self.ps2}{cmd}\n", style='command')
self.sigCommandEntered.emit(self, cmd)
self._commandBuffer.append(cmd)
fullcmd = '\n'.join(self._commandBuffer)
try:
cmdCode = code.compile_command(fullcmd)
self.input.setMultiline(False)
except Exception:
# cannot continue processing this command; reset and print exception
self._commandBuffer = []
self.displayException()
self.input.setMultiline(False)
else:
if cmdCode is None:
# incomplete input; wait for next line
self.input.setMultiline(True)
return
self._commandBuffer = []
# run command
try:
with self.stdoutInterceptor:
exec(cmdCode, self.globals(), self.locals())
except Exception as exc:
self.displayException()
self.sigCommandRaisedException.emit(self, exc)
# Add a newline if the output did not
cursor = self.output.textCursor()
if cursor.columnNumber() > 0:
self.write('\n')
def write(self, strn, style='output', scrollToBottom='auto'):
"""Write a string into the console.
If scrollToBottom is 'auto', then the console is automatically scrolled
to fit the new text only if it was already at the bottom.
"""
isGuiThread = QtCore.QThread.currentThread() == QtCore.QCoreApplication.instance().thread()
if not isGuiThread:
sys.__stdout__.write(strn)
return
cursor = self.output.textCursor()
cursor.movePosition(QtGui.QTextCursor.MoveOperation.End)
self.output.setTextCursor(cursor)
sb = self.output.verticalScrollBar()
scroll = sb.value()
if scrollToBottom == 'auto':
atBottom = scroll == sb.maximum()
scrollToBottom = atBottom
row = cursor.blockNumber()
if style == 'command':
self._lastCommandRow = row
if style == 'output' and row == self._lastCommandRow + 1:
# adjust style for first line of output
firstLine, endl, strn = strn.partition('\n')
self._setTextStyle('output_first_line')
self.output.insertPlainText(firstLine + endl)
if len(strn) > 0:
self._setTextStyle(style)
self.output.insertPlainText(strn)
# return to output style immediately to avoid seeing an extra line of command style
if style != 'output':
self._setTextStyle('output')
if scrollToBottom:
sb.setValue(sb.maximum())
else:
sb.setValue(scroll)
def displayException(self):
"""
Display the current exception and stack.
"""
tb = traceback.format_exc()
lines = []
indent = 4
prefix = ''
for l in tb.split('\n'):
lines.append(" "*indent + prefix + l)
self.write('\n'.join(lines))
def _setTextStyle(self, style):
charFormat, blockFormat = self.textStyles[style]
cursor = self.output.textCursor()
cursor.setBlockFormat(blockFormat)
self.output.setCurrentCharFormat(charFormat)
class StdoutInterceptor:
"""Used to temporarily redirect writes meant for sys.stdout and sys.stderr to a new location
"""
def __init__(self, writeFn):
self._orig_stdout = None
self._orig_stderr = None
self.writeFn = writeFn
def realOutputFiles(self):
"""Return the real sys.stdout and stderr (which are sometimes masked while running commands)
"""
return (
self._orig_stdout or sys.stdout,
self._orig_stderr or sys.stderr
)
def print(self, *args):
"""Print to real stdout (for debugging)
"""
self.realOutputFiles()[0].write(' '.join(map(str, args)) + "\n")
def flush(self):
# Need to implement this since we temporarily occlude sys.stdout
pass
def fileno(self):
# Need to implement this since we temporarily occlude sys.stdout, and someone may be looking for it (faulthandler, for example)
return 1
def write(self, strn):
self.writeFn(strn)
def __enter__(self):
self._orig_stdout = sys.stdout
self._orig_stderr = sys.stderr
sys.stdout = self
sys.stderr = self
def __exit__(self, exc_type, exc_val, exc_tb):
sys.stdout = self._orig_stdout
sys.stderr = self._orig_stderr
self._orig_stdout = None
self._orig_stderr = None
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