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- import sys
- from PyQt4 import QtCore, QtGui, Qsci
- class MainWindow(QtGui.QMainWindow):
- def __init__(self):
- QtGui.QMainWindow.__init__(self)
- self.setWindowTitle('Custom Lexer Example')
- self.setGeometry(QtCore.QRect(50,200,400,400))
- self.editor = Qsci.QsciScintilla(self)
- self.editor.setUtf8(True)
- self.editor.setMarginWidth(2, 15)
- self.editor.setFolding(True)
- self.setCentralWidget(self.editor)
- self.lexer = CustomLexer(self.editor)
- self.editor.setLexer(self.lexer)
- self.editor.setText('\n# sample source\n\nfoo = 1\nbar = 2\n')
- class CustomLexer(Qsci.QsciLexerCustom):
- def __init__(self, parent):
- Qsci.QsciLexerCustom.__init__(self, parent)
- self._styles = {
- 0: 'Default',
- 1: 'Comment',
- 2: 'Key',
- 3: 'Assignment',
- 4: 'Value',
- }
- for key,value in self._styles.iteritems():
- setattr(self, value, key)
- def description(self, style):
- return self._styles.get(style, '')
- def defaultColor(self, style):
- if style == self.Default:
- return QtGui.QColor('#000000')
- elif style == self.Comment:
- return QtGui.QColor('#C0C0C0')
- elif style == self.Key:
- return QtGui.QColor('#0000CC')
- elif style == self.Assignment:
- return QtGui.QColor('#CC0000')
- elif style == self.Value:
- return QtGui.QColor('#00CC00')
- return Qsci.QsciLexerCustom.defaultColor(self, style)
- def styleText(self, start, end):
- editor = self.editor()
- if editor is None:
- return
- # scintilla works with encoded bytes, not decoded characters.
- # this matters if the source contains non-ascii characters and
- # a multi-byte encoding is used (e.g. utf-8)
- source = ''
- if end > editor.length():
- end = editor.length()
- if end > start:
- if sys.hexversion >= 0x02060000:
- # faster when styling big files, but needs python 2.6
- source = bytearray(end - start)
- editor.SendScintilla(
- editor.SCI_GETTEXTRANGE, start, end, source)
- else:
- source = unicode(editor.text()
- ).encode('utf-8')[start:end]
- if not source:
- return
- # the line index will also be needed to implement folding
- index = editor.SendScintilla(editor.SCI_LINEFROMPOSITION, start)
- if index > 0:
- # the previous state may be needed for multi-line styling
- pos = editor.SendScintilla(
- editor.SCI_GETLINEENDPOSITION, index - 1)
- state = editor.SendScintilla(editor.SCI_GETSTYLEAT, pos)
- else:
- state = self.Default
- set_style = self.setStyling
- self.startStyling(start, 0x1f)
- # scintilla always asks to style whole lines
- for line in source.splitlines(True):
- length = len(line)
- if line.startswith('#'):
- state = self.Comment
- else:
- # the following will style lines like "x = 0"
- pos = line.find('=')
- if pos > 0:
- set_style(pos, self.Key)
- set_style(1, self.Assignment)
- length = length - pos - 1
- state = self.Value
- else:
- state = self.Default
- set_style(length, state)
- # folding implementation goes here
- index += 1
- if __name__ == "__main__":
- app = QtGui.QApplication(sys.argv)
- app.connect(app, QtCore.SIGNAL('lastWindowClosed()'),
- QtCore.SLOT('quit()'))
- win = MainWindow()
- win.show()
- sys.exit(app.exec_())
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