python regexp.py

#!/usr/bin/env python

"""PyQt4 port of the tools/regexp example from Qt v4.x"""

# This is only needed for Python v2 but is harmless for Python v3.
import sip
sip.setapi('QVariant', 2)

from PyQt4 import QtCore, QtGui


class RegExpDialog(QtGui.QDialog):
MaxCaptures = 6

def __init__(self, parent=None):
super(RegExpDialog, self).__init__(parent)

self.patternComboBox = QtGui.QComboBox()
self.patternComboBox.setEditable(True)
self.patternComboBox.setSizePolicy(QtGui.QSizePolicy.Expanding,
QtGui.QSizePolicy.Preferred)

patternLabel = QtGui.QLabel("&Pattern:")
patternLabel.setBuddy(self.patternComboBox)

self.escapedPatternLineEdit = QtGui.QLineEdit()
self.escapedPatternLineEdit.setReadOnly(True)
palette = self.escapedPatternLineEdit.palette()
palette.setBrush(QtGui.QPalette.Base,
palette.brush(QtGui.QPalette.Disabled, QtGui.QPalette.Base))
self.escapedPatternLineEdit.setPalette(palette)

escapedPatternLabel = QtGui.QLabel("&Escaped Pattern:")
escapedPatternLabel.setBuddy(self.escapedPatternLineEdit)

self.syntaxComboBox = QtGui.QComboBox()
self.syntaxComboBox.addItem("Regular expression v1",
QtCore.QRegExp.RegExp)
self.syntaxComboBox.addItem("Regular expression v2",
QtCore.QRegExp.RegExp2)
self.syntaxComboBox.addItem("Wildcard", QtCore.QRegExp.Wildcard)
self.syntaxComboBox.addItem("Fixed string",
QtCore.QRegExp.FixedString)

syntaxLabel = QtGui.QLabel("&Pattern Syntax:")
syntaxLabel.setBuddy(self.syntaxComboBox)

self.textComboBox = QtGui.QComboBox()
self.textComboBox.setEditable(True)
self.textComboBox.setSizePolicy(QtGui.QSizePolicy.Expanding,
QtGui.QSizePolicy.Preferred)

textLabel = QtGui.QLabel("&Text:")
textLabel.setBuddy(self.textComboBox)

self.caseSensitiveCheckBox = QtGui.QCheckBox("Case &Sensitive")
self.caseSensitiveCheckBox.setChecked(True)
self.minimalCheckBox = QtGui.QCheckBox("&Minimal")

indexLabel = QtGui.QLabel("Index of Match:")
self.indexEdit = QtGui.QLineEdit()
self.indexEdit.setReadOnly(True)

matchedLengthLabel = QtGui.QLabel("Matched Length:")
self.matchedLengthEdit = QtGui.QLineEdit()
self.matchedLengthEdit.setReadOnly(True)

self.captureLabels = []
self.captureEdits = []
for i in range(self.MaxCaptures):
self.captureLabels.append(QtGui.QLabel("Capture %d:" % i))
self.captureEdits.append(QtGui.QLineEdit())
self.captureEdits[i].setReadOnly(True)
self.captureLabels[0].setText("Match:")

checkBoxLayout = QtGui.QHBoxLayout()
checkBoxLayout.addWidget(self.caseSensitiveCheckBox)
checkBoxLayout.addWidget(self.minimalCheckBox)
checkBoxLayout.addStretch(1)

mainLayout = QtGui.QGridLayout()
mainLayout.addWidget(patternLabel, 0, 0)
mainLayout.addWidget(self.patternComboBox, 0, 1)
mainLayout.addWidget(escapedPatternLabel, 1, 0)
mainLayout.addWidget(self.escapedPatternLineEdit, 1, 1)
mainLayout.addWidget(syntaxLabel, 2, 0)
mainLayout.addWidget(self.syntaxComboBox, 2, 1)
mainLayout.addLayout(checkBoxLayout, 3, 0, 1, 2)
mainLayout.addWidget(textLabel, 4, 0)
mainLayout.addWidget(self.textComboBox, 4, 1)
mainLayout.addWidget(indexLabel, 5, 0)
mainLayout.addWidget(self.indexEdit, 5, 1)
mainLayout.addWidget(matchedLengthLabel, 6, 0)
mainLayout.addWidget(self.matchedLengthEdit, 6, 1)

for i in range(self.MaxCaptures):
mainLayout.addWidget(self.captureLabels[i], 7 + i, 0)
mainLayout.addWidget(self.captureEdits[i], 7 + i, 1)
self.setLayout(mainLayout)

self.patternComboBox.editTextChanged.connect(self.refresh)
self.textComboBox.editTextChanged.connect(self.refresh)
self.caseSensitiveCheckBox.toggled.connect(self.refresh)
self.minimalCheckBox.toggled.connect(self.refresh)
self.syntaxComboBox.currentIndexChanged.connect(self.refresh)

self.patternComboBox.addItem("[A-Za-z_]+([A-Za-z_0-9]*)")
self.textComboBox.addItem("(10 + delta4)* 32")

self.setWindowTitle("RegExp")
self.setFixedHeight(self.sizeHint().height())
self.refresh()

def refresh(self):
self.setUpdatesEnabled(False)

pattern = self.patternComboBox.currentText()
text = self.textComboBox.currentText()

escaped = str(pattern)
escaped.replace('\\', '\\\\')
escaped.replace('"', '\\"')
self.escapedPatternLineEdit.setText('"' + escaped + '"')

rx = QtCore.QRegExp(pattern)
cs = QtCore.Qt.CaseInsensitive
if self.caseSensitiveCheckBox.isChecked():
cs = QtCore.Qt.CaseSensitive
rx.setCaseSensitivity(cs)
rx.setMinimal(self.minimalCheckBox.isChecked())
syntax = self.syntaxComboBox.itemData(self.syntaxComboBox.currentIndex())
rx.setPatternSyntax(syntax)

palette = self.patternComboBox.palette()
if rx.isValid():
palette.setColor(QtGui.QPalette.Text,
self.textComboBox.palette().color(QtGui.QPalette.Text))
else:
palette.setColor(QtGui.QPalette.Text, QtCore.Qt.red)
self.patternComboBox.setPalette(palette)

self.indexEdit.setText(str(rx.indexIn(text)))
self.matchedLengthEdit.setText(str(rx.matchedLength()))

for i in range(self.MaxCaptures):
self.captureLabels[i].setEnabled(i <= rx.numCaptures())
self.captureEdits[i].setEnabled(i <= rx.numCaptures())
self.captureEdits[i].setText(rx.cap(i))

self.setUpdatesEnabled(True)

if __name__ == '__main__':

import sys

app = QtGui.QApplication(sys.argv)
dialog = RegExpDialog()
sys.exit(dialog.exec_())