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highlightedtextedit.py
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#!/usr/bin/env python
"""
highlightedtextedit.py
A PyQt custom widget example for Qt Designer.
Copyright (C) 2006 David Boddie <[email protected]>
Copyright (C) 2005-2006 Trolltech ASA. All rights reserved.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
"""
from PyQt4 import QtCore, QtGui
class HighlightedTextEdit(QtGui.QTextEdit):
"""HighlightedTextEdit(QtGui.QTextEdit)
Provides a custom text editor with a simple built-in Python syntax
highlighter.
"""
def __init__(self, parent=None):
QtGui.QTextEdit.__init__(self, parent)
self.setFrameShape(QtGui.QFrame.Box)
self.setFrameShadow(QtGui.QFrame.Plain)
char_format = QtGui.QTextCharFormat()
char_format.setFont(self.font())
self.highlighter = PythonHighlighter(self.document(), char_format)
# The code property is implemented with the getCode() and setCode()
# methods, and contains the plain text shown in the editor.
def getCode(self):
self._code = self.toPlainText()
return self._code
def setCode(self, text):
self.setPlainText(text)
code = QtCore.pyqtProperty("QString", getCode, setCode)
# The displayFont property is implemented with the getDisplayFont() and
# setDisplayFont() methods, and contains the font used to display the
# text in the editor.
def getDisplayFont(self):
return QtGui.QWidget.font(self)
def setDisplayFont(self, font):
QtGui.QWidget.setFont(self, font)
self.highlighter.updateHighlighter(font)
self.update()
displayFont = QtCore.pyqtProperty("QFont", getDisplayFont, setDisplayFont)
class PythonHighlighter(QtGui.QSyntaxHighlighter):
keywords = (
"and", "del", "for", "is", "raise",
"assert", "elif", "from", "lambda", "return",
"break", "else", "global", "not", "try",
"class", "except", "if", "or", "while",
"continue", "exec", "import", "pass", "yield",
"def", "finally", "in", "print"
)
def __init__(self, document, base_format):
QtGui.QSyntaxHighlighter.__init__(self, document)
self.base_format = base_format
self.document = document
self.updateHighlighter(base_format.font())
def highlightBlock(self, text):
self.setCurrentBlockState(0)
if text.trimmed().isEmpty():
self.setFormat(0, len(text), self.empty_format)
return
self.setFormat(0, len(text), self.base_format)
startIndex = 0
if self.previousBlockState() != 1:
startIndex = text.indexOf(self.multiLineStringBegin)
if startIndex > -1:
self.highlightRules(text, 0, startIndex)
else:
self.highlightRules(text, 0, len(text))
while startIndex >= 0:
endIndex = text.indexOf(self.multiLineStringEnd,
startIndex + len(self.multiLineStringBegin.pattern()))
if endIndex == -1:
self.setCurrentBlockState(1)
commentLength = text.length() - startIndex
else:
commentLength = endIndex - startIndex + \
self.multiLineStringEnd.matchedLength()
self.highlightRules(text, endIndex, len(text))
self.setFormat(startIndex, commentLength, self.multiLineStringFormat)
startIndex = text.indexOf(self.multiLineStringBegin,
startIndex + commentLength)
def highlightRules(self, text, start, finish):
for expression, format in self.rules:
index = expression.indexIn(text, start)
while index >= start and index < finish:
length = expression.matchedLength()
self.setFormat(index, min(length, finish - index), format)
index = expression.indexIn(text, index + length)
def updateFonts(self, font):
self.base_format.setFont(font)
self.empty_format = QtGui.QTextCharFormat(self.base_format)
self.empty_format.setFontPointSize(font.pointSize()/4.0)
self.keywordFormat = QtGui.QTextCharFormat(self.base_format)
self.keywordFormat.setForeground(QtCore.Qt.darkBlue)
self.keywordFormat.setFontWeight(QtGui.QFont.Bold)
self.callableFormat = QtGui.QTextCharFormat(self.base_format)
self.callableFormat.setForeground(QtCore.Qt.darkBlue)
self.magicFormat = QtGui.QTextCharFormat(self.base_format)
self.magicFormat.setForeground(QtGui.QColor(224,128,0))
self.qtFormat = QtGui.QTextCharFormat(self.base_format)
self.qtFormat.setForeground(QtCore.Qt.blue)
self.qtFormat.setFontWeight(QtGui.QFont.Bold)
self.selfFormat = QtGui.QTextCharFormat(self.base_format)
self.selfFormat.setForeground(QtCore.Qt.red)
#self.selfFormat.setFontItalic(True)
self.singleLineCommentFormat = QtGui.QTextCharFormat(self.base_format)
self.singleLineCommentFormat.setForeground(QtCore.Qt.darkGreen)
self.multiLineStringFormat = QtGui.QTextCharFormat(self.base_format)
self.multiLineStringFormat.setBackground(
QtGui.QBrush(QtGui.QColor(127,127,255)))
self.quotationFormat1 = QtGui.QTextCharFormat(self.base_format)
self.quotationFormat1.setForeground(QtCore.Qt.blue)
self.quotationFormat2 = QtGui.QTextCharFormat(self.base_format)
self.quotationFormat2.setForeground(QtCore.Qt.blue)
def updateRules(self):
self.rules = []
self.rules += map(lambda s: (QtCore.QRegExp(r"\b"+s+r"\b"),
self.keywordFormat), self.keywords)
self.rules.append((QtCore.QRegExp(r"\b[A-Za-z_]+\(.*\)"), self.callableFormat))
self.rules.append((QtCore.QRegExp(r"\b__[a-z]+__\b"), self.magicFormat))
self.rules.append((QtCore.QRegExp(r"\bself\b"), self.selfFormat))
self.rules.append((QtCore.QRegExp(r"\bQ([A-Z][a-z]*)+\b"), self.qtFormat))
self.rules.append((QtCore.QRegExp(r"#[^\n]*"), self.singleLineCommentFormat))
self.multiLineStringBegin = QtCore.QRegExp(r'\"\"\"')
self.multiLineStringEnd = QtCore.QRegExp(r'\"\"\"')
self.rules.append((QtCore.QRegExp(r'\"[^\n]*\"'), self.quotationFormat1))
self.rules.append((QtCore.QRegExp(r"'[^\n]*'"), self.quotationFormat2))
def updateHighlighter(self, font):
self.updateFonts(font)
self.updateRules()
self.setDocument(self.document)
if __name__ == "__main__":
import sys
app = QtGui.QApplication(sys.argv)
widget = HighlightedTextEdit()
widget.show()
sys.exit(app.exec_())