1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
|
#!/usr/bin/env python
"""
highlightedtextedit.py
A PyQt custom widget example for Qt Designer.
Copyright (C) 2006 David Boddie <david@boddie.org.uk>
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):
super(HighlightedTextEdit, self).__init__(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(str, 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(QtGui.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):
super(PythonHighlighter, self).__init__(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_())
|
