highlighter.py

   1 # BiaWeb Website content manager (c) 2010 V.Harishankar
   2 # HTML highlighter class
   3
   4 import PyQt4
   5
   6 class SimpleHtmlHighlighter (PyQt4.QtGui.QSyntaxHighlighter):
   7         def __init__ (self, document):
   8                 PyQt4.QtGui.QSyntaxHighlighter.__init__ (self, document)
   9
  10         def highlightBlock (self, text):
  11                 # define the character highlight formats
  12
  13                 # for tags
  14                 charfmt1 = PyQt4.QtGui.QTextCharFormat ()
  15                 charfmt1.setFontWeight (PyQt4.QtGui.QFont.Bold)
  16                 charfmt1.setForeground (PyQt4.QtCore.Qt.blue)
  17
  18                 # for strings
  19                 charfmt2 = PyQt4.QtGui.QTextCharFormat ()
  20                 charfmt2.setForeground (PyQt4.QtCore.Qt.darkGreen)
  21
  22                 # for html entities
  23                 charfmt3 = PyQt4.QtGui.QTextCharFormat ()
  24                 charfmt3.setForeground (PyQt4.QtCore.Qt.magenta)
  25
  26                 # matching regular expressions
  27                 htmltagexps = [ (PyQt4.QtCore.QRegExp ("<[^<>]+>"), charfmt1),
  28                                                 (PyQt4.QtCore.QRegExp ("\"[^\"]+\""), charfmt2),
  29                                                 (PyQt4.QtCore.QRegExp ("&[^;]+;"), charfmt3)
  30                                         ]
  31
  32                 # run through the list of regular expressions to highlight
  33                 for htmltagexp, charfmt in htmltagexps:
  34                         index = htmltagexp.indexIn (text)
  35                         while index >= 0:
  36                                 length = htmltagexp.matchedLength ()
  37                                 # self.setFormat is actual code highlighting
  38                                 self.setFormat (index, length, charfmt)
  39                                 index = htmltagexp.indexIn (text, index + length)