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#!/usr/bin/env python
"""PyQt4 port of the richtext/syntaxhighlighter example from Qt v4.x"""
import sys
from PyQt4 import QtCore, QtGui
import syntaxhighlighter_rc
class MainWindow(QtGui.QMainWindow):
def __init__(self, parent=None):
QtGui.QMainWindow.__init__(self, parent)
self.highlighter = Highlighter()
self.setupFileMenu()
self.setupEditor()
self.setCentralWidget(self.editor)
self.setWindowTitle(self.tr("Syntax Highlighter"))
def newFile(self):
self.editor.clear()
def openFile(self, path=""):
fileName = QtCore.QString(path)
if fileName.isEmpty():
fileName = QtGui.QFileDialog.getOpenFileName(self, self.tr("Open File"), "",
"qmake Files (*.pro *.prf *.pri)")
if not fileName.isEmpty():
inFile = QtCore.QFile(fileName)
if inFile.open(QtCore.QFile.ReadOnly | QtCore.QFile.Text):
self.editor.setPlainText(QtCore.QString(inFile.readAll()))
def setupEditor(self):
variableFormat = QtGui.QTextCharFormat()
variableFormat.setFontWeight(QtGui.QFont.Bold)
variableFormat.setForeground(QtCore.Qt.blue)
self.highlighter.addMapping("\\b[A-Z_]+\\b", variableFormat)
singleLineCommentFormat = QtGui.QTextCharFormat()
singleLineCommentFormat.setBackground(QtGui.QColor("#77ff77"))
self.highlighter.addMapping("#[^\n]*", singleLineCommentFormat)
quotationFormat = QtGui.QTextCharFormat()
quotationFormat.setBackground(QtCore.Qt.cyan)
quotationFormat.setForeground(QtCore.Qt.blue)
self.highlighter.addMapping("\".*\"", quotationFormat)
functionFormat = QtGui.QTextCharFormat()
functionFormat.setFontItalic(True)
functionFormat.setForeground(QtCore.Qt.blue)
self.highlighter.addMapping("\\b[a-z0-9_]+\\(.*\\)", functionFormat)
font = QtGui.QFont()
font.setFamily("Courier")
font.setFixedPitch(True)
font.setPointSize(10)
self.editor = QtGui.QTextEdit()
self.editor.setFont(font)
self.highlighter.addToDocument(self.editor.document())
def setupFileMenu(self):
fileMenu = QtGui.QMenu(self.tr("&File"), self)
self.menuBar().addMenu(fileMenu)
newFileAct = QtGui.QAction(self.tr("&New..."), self)
newFileAct.setShortcut(QtGui.QKeySequence(self.tr("Ctrl+N", "File|New")))
self.connect(newFileAct, QtCore.SIGNAL("triggered()"), self.newFile)
fileMenu.addAction(newFileAct)
openFileAct = QtGui.QAction(self.tr("&Open..."), self)
openFileAct.setShortcut(QtGui.QKeySequence(self.tr("Ctrl+O", "File|Open")))
self.connect(openFileAct, QtCore.SIGNAL("triggered()"), self.openFile)
fileMenu.addAction(openFileAct)
fileMenu.addAction(self.tr("E&xit"), QtGui.qApp, QtCore.SLOT("quit()"),
QtGui.QKeySequence(self.tr("Ctrl+Q", "File|Exit")))
class Highlighter(QtCore.QObject):
def __init__(self, parent=None):
QtCore.QObject.__init__(self, parent)
self.mappings = {}
def addToDocument(self, doc):
self.connect(doc, QtCore.SIGNAL("contentsChange(int, int, int)"), self.highlight)
def addMapping(self, pattern, format):
self.mappings[pattern] = format
def highlight(self, position, removed, added):
doc = self.sender()
block = doc.findBlock(position)
if not block.isValid():
return
endBlock = QtGui.QTextBlock()
if added > removed:
endBlock = doc.findBlock(position + added)
else:
endBlock = block
while block.isValid() and not (endBlock < block):
self.highlightBlock(block)
block = block.next()
def highlightBlock(self, block):
layout = block.layout()
text = block.text()
overrides = []
for pattern in self.mappings:
expression = QtCore.QRegExp(pattern)
i = text.indexOf(expression)
while i >= 0:
range = QtGui.QTextLayout.FormatRange()
range.start = i
range.length = expression.matchedLength()
range.format = self.mappings[pattern]
overrides.append(range)
i = text.indexOf(expression, i + expression.matchedLength())
layout.setAdditionalFormats(overrides)
block.document().markContentsDirty(block.position(), block.length())
if __name__ == '__main__':
app = QtGui.QApplication(sys.argv)
window = MainWindow()
window.resize(640, 512)
window.show()
window.openFile(":/examples/example")
sys.exit(app.exec_())
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