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83 lines
2.7 KiB
Python
83 lines
2.7 KiB
Python
# syntax.py
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from PyQt4 import QtCore, QtGui
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def format(color, style=''):
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"""Return a QTextCharFormat with the given attributes."""
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format = QtGui.QTextCharFormat()
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format.setForeground(getattr(QtCore.Qt, color))
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if 'bold' in style:
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format.setFontWeight(QtGui.QFont.Bold)
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if 'italic' in style:
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format.setFontItalic(True)
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return format
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class Highlighter (QtGui.QSyntaxHighlighter):
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"""Base class for all highlighters."""
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def __init__ (self, document):
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"""Initialize rules and styles."""
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super(Highlighter, self).__init__(document)
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self.rules = []
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self.styles = {}
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def highlightBlock(self, text):
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"""Highlight a text block."""
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for expression, format in self.rules:
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# get first match
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index = expression.indexIn(text)
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while index >= 0:
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length = expression.matchedLength()
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self.setFormat(index, length, format)
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# jump to next match
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index = expression.indexIn(text, index + length)
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self.setCurrentBlockState(0)
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def addRule (self, pattern, style):
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"""Add a rule pattern with given style."""
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self.rules.append((QtCore.QRegExp(pattern), self.styles[style]))
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class XmlHighlighter (Highlighter):
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"""XML syntax highlighter."""
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def __init__(self, document):
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"""Set XML syntax rules."""
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super(XmlHighlighter, self).__init__(document)
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self.styles.update({
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'keyword': format('darkBlue'),
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'attribute': format('darkGreen'),
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'comment': format('darkYellow'),
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'string': format('darkMagenta'),
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})
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# keywords
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for reg in ('/>', '>', '<!?[a-zA-Z0-9_]+'):
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self.addRule(reg, 'keyword')
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# attributes
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self.addRule(r"\b[A-Za-z0-9_]+(?=\s*\=)", 'attribute')
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# double-quoted string, possibly containing escape sequences
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self.addRule(r'"[^"\\]*(\\.[^"\\]*)*"', 'string')
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# single-quoted string, possibly containing escape sequences
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self.addRule(r"'[^'\\]*(\\.[^'\\]*)*'", 'string')
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# comments
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self.addRule(r"<!--[^>]*-->", 'comment')
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# Treat HTML as XML
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HtmlHighlighter = XmlHighlighter
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class IniHighlighter (Highlighter):
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"""INI syntax highlighter."""
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def __init__(self, document):
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"""Set INI syntax rules."""
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super(IniHighlighter, self).__init__(document)
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self.styles.update({
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'section': format('darkBlue'),
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'property': format('darkGreen'),
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'comment': format('darkYellow'),
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})
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self.addRule(r'\b\[[a-zA-Z0-9_]+\]\b', 'section')
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self.addRule(r'\b[a-zA-Z0-9_]+\](?=\s*\=)', 'property')
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self.addRule(r'#[^\n]*', 'comment')
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