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Diffstat (limited to 'examples/widgets/richtext/syntaxhighlighter.py')
-rwxr-xr-x | examples/widgets/richtext/syntaxhighlighter.py | 203 |
1 files changed, 203 insertions, 0 deletions
diff --git a/examples/widgets/richtext/syntaxhighlighter.py b/examples/widgets/richtext/syntaxhighlighter.py new file mode 100755 index 000000000..8a14632fe --- /dev/null +++ b/examples/widgets/richtext/syntaxhighlighter.py @@ -0,0 +1,203 @@ +#!/usr/bin/env python + +############################################################################# +## +## Copyright (C) 2013 Riverbank Computing Limited. +## Copyright (C) 2016 The Qt Company Ltd. +## Contact: http://www.qt.io/licensing/ +## +## This file is part of the PySide examples of the Qt Toolkit. +## +## $QT_BEGIN_LICENSE:BSD$ +## You may use this file under the terms of the BSD license as follows: +## +## "Redistribution and use in source and binary forms, with or without +## modification, are permitted provided that the following conditions are +## met: +## * Redistributions of source code must retain the above copyright +## notice, this list of conditions and the following disclaimer. +## * Redistributions in binary form must reproduce the above copyright +## notice, this list of conditions and the following disclaimer in +## the documentation and/or other materials provided with the +## distribution. +## * Neither the name of The Qt Company Ltd nor the names of its +## contributors may be used to endorse or promote products derived +## from this software without specific prior written permission. +## +## +## THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +## "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +## LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +## A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +## OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +## SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +## LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +## DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +## THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +## (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +## OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." +## +## $QT_END_LICENSE$ +## +############################################################################# + +"""PySide2 port of the widgets/richtext/syntaxhighlighter example from Qt v5.x""" + +from PySide2 import QtCore, QtGui, QtWidgets + + +class MainWindow(QtWidgets.QMainWindow): + def __init__(self, parent=None): + super(MainWindow, self).__init__(parent) + + self.setupFileMenu() + self.setupHelpMenu() + self.setupEditor() + + self.setCentralWidget(self.editor) + self.setWindowTitle("Syntax Highlighter") + + def about(self): + QtWidgets.QMessageBox.about(self, "About Syntax Highlighter", + "<p>The <b>Syntax Highlighter</b> example shows how to " \ + "perform simple syntax highlighting by subclassing the " \ + "QSyntaxHighlighter class and describing highlighting " \ + "rules using regular expressions.</p>") + + def newFile(self): + self.editor.clear() + + def openFile(self, path=None): + if not path: + path = QtWidgets.QFileDialog.getOpenFileName(self, "Open File", + '', "C++ Files (*.cpp *.h)") + + if path: + inFile = QtCore.QFile(path[0]) + if inFile.open(QtCore.QFile.ReadOnly | QtCore.QFile.Text): + text = inFile.readAll() + + try: + # Python v3. + text = str(text, encoding='ascii') + except TypeError: + # Python v2. + text = str(text) + + self.editor.setPlainText(text) + + def setupEditor(self): + font = QtGui.QFont() + font.setFamily('Courier') + font.setFixedPitch(True) + font.setPointSize(10) + + self.editor = QtWidgets.QTextEdit() + self.editor.setFont(font) + + self.highlighter = Highlighter(self.editor.document()) + + def setupFileMenu(self): + fileMenu = QtWidgets.QMenu("&File", self) + self.menuBar().addMenu(fileMenu) + + fileMenu.addAction("&New...", self.newFile, "Ctrl+N") + fileMenu.addAction("&Open...", self.openFile, "Ctrl+O") + fileMenu.addAction("E&xit", QtWidgets.qApp.quit, "Ctrl+Q") + + def setupHelpMenu(self): + helpMenu = QtWidgets.QMenu("&Help", self) + self.menuBar().addMenu(helpMenu) + + helpMenu.addAction("&About", self.about) + helpMenu.addAction("About &Qt", QtWidgets.qApp.aboutQt) + + +class Highlighter(QtGui.QSyntaxHighlighter): + def __init__(self, parent=None): + super(Highlighter, self).__init__(parent) + + keywordFormat = QtGui.QTextCharFormat() + keywordFormat.setForeground(QtCore.Qt.darkBlue) + keywordFormat.setFontWeight(QtGui.QFont.Bold) + + keywordPatterns = ["\\bchar\\b", "\\bclass\\b", "\\bconst\\b", + "\\bdouble\\b", "\\benum\\b", "\\bexplicit\\b", "\\bfriend\\b", + "\\binline\\b", "\\bint\\b", "\\blong\\b", "\\bnamespace\\b", + "\\boperator\\b", "\\bprivate\\b", "\\bprotected\\b", + "\\bpublic\\b", "\\bshort\\b", "\\bsignals\\b", "\\bsigned\\b", + "\\bslots\\b", "\\bstatic\\b", "\\bstruct\\b", + "\\btemplate\\b", "\\btypedef\\b", "\\btypename\\b", + "\\bunion\\b", "\\bunsigned\\b", "\\bvirtual\\b", "\\bvoid\\b", + "\\bvolatile\\b"] + + self.highlightingRules = [(QtCore.QRegExp(pattern), keywordFormat) + for pattern in keywordPatterns] + + classFormat = QtGui.QTextCharFormat() + classFormat.setFontWeight(QtGui.QFont.Bold) + classFormat.setForeground(QtCore.Qt.darkMagenta) + self.highlightingRules.append((QtCore.QRegExp("\\bQ[A-Za-z]+\\b"), + classFormat)) + + singleLineCommentFormat = QtGui.QTextCharFormat() + singleLineCommentFormat.setForeground(QtCore.Qt.red) + self.highlightingRules.append((QtCore.QRegExp("//[^\n]*"), + singleLineCommentFormat)) + + self.multiLineCommentFormat = QtGui.QTextCharFormat() + self.multiLineCommentFormat.setForeground(QtCore.Qt.red) + + quotationFormat = QtGui.QTextCharFormat() + quotationFormat.setForeground(QtCore.Qt.darkGreen) + self.highlightingRules.append((QtCore.QRegExp("\".*\""), + quotationFormat)) + + functionFormat = QtGui.QTextCharFormat() + functionFormat.setFontItalic(True) + functionFormat.setForeground(QtCore.Qt.blue) + self.highlightingRules.append((QtCore.QRegExp("\\b[A-Za-z0-9_]+(?=\\()"), + functionFormat)) + + self.commentStartExpression = QtCore.QRegExp("/\\*") + self.commentEndExpression = QtCore.QRegExp("\\*/") + + def highlightBlock(self, text): + for pattern, format in self.highlightingRules: + expression = QtCore.QRegExp(pattern) + index = expression.indexIn(text) + while index >= 0: + length = expression.matchedLength() + self.setFormat(index, length, format) + index = expression.indexIn(text, index + length) + + self.setCurrentBlockState(0) + + startIndex = 0 + if self.previousBlockState() != 1: + startIndex = self.commentStartExpression.indexIn(text) + + while startIndex >= 0: + endIndex = self.commentEndExpression.indexIn(text, startIndex) + + if endIndex == -1: + self.setCurrentBlockState(1) + commentLength = len(text) - startIndex + else: + commentLength = endIndex - startIndex + self.commentEndExpression.matchedLength() + + self.setFormat(startIndex, commentLength, + self.multiLineCommentFormat) + startIndex = self.commentStartExpression.indexIn(text, + startIndex + commentLength); + + +if __name__ == '__main__': + + import sys + + app = QtWidgets.QApplication(sys.argv) + window = MainWindow() + window.resize(640, 512) + window.show() + sys.exit(app.exec_()) |