danielSanchezQ · April 10, 2012 17:12 · Apr 10, 2012
diff --git a/gistfile1.py b/gistfile1.py
@@ -0,0 +1,123 @@
+class Python (QSyntaxHighlighter):
+    """Syntax highlighter for the Python language.
+    """
+    # Python keywords
+    keywords = [
+        'and', 'as', 'assert', 'break', 'class', 
+        'continue', 'def', 'del', 'elif', 'else', 
+        'except', 'exec', 'finally', 'for', 'from', 
+        'global', 'if', 'import', 'in', 'is', 
+        'lambda', 'not', 'or', 'pass', 'print', 'raise', 
+        'return', 'try', 'while', 'with', 'yield', 'True', 
+        'False', 'None' ]
+
+    # Python operators
+    operators = [
+        '=',
+        # Comparison
+        '==', '!=', '<', '<=', '>', '>=',
+        # Arithmetic
+        '\+', '-', '\*', '/', '//', '\%', '\*\*',
+        # In-place
+        '\+=', '-=', '\*=', '/=', '\%=',
+        # Bitwise
+        '\^', '\|', '\&', '\~', '>>', '<<' ]
+
+    # Python braces
+    braces = [
+        '\{', '\}', '\(', '\)', '\[', '\]' ]
+    def __init__(self, document):
+        QSyntaxHighlighter.__init__(self, document)
+
+        # Multi-line strings (expression, flag, style)
+        # FIXME: The triple-quotes in these two lines will mess up the
+        # syntax highlighting from this point onward
+        self.tri_single = (QRegExp("'''"), 1, STYLES['string2'])
+        self.tri_double = (QRegExp('"""'), 2, STYLES['string2'])
+
+        rules = []
+        rules += [(r'\b%s\b' % w, 0, STYLES['keyword'])
+            for w in Python.keywords]
+        rules += [(r'%s' % o, 0, STYLES['operator'])
+            for o in Python.operators]
+        rules += [(r'%s' % b, 0, STYLES['brace'])
+            for b in Python.braces]
+        rules += [
+            # Double-quoted string, possibly containing escape sequences
+            (r'"[^"\\]*(\\.[^"\\]*)*"', 0, STYLES['string']),
+            # Single-quoted string, possibly containing escape sequences
+            (r"'[^'\\]*(\\.[^'\\]*)*'", 0, STYLES['string']),
+            # 'def' followed by an identifier
+            (r'\bdef\b\s*(\w+)', 1, STYLES['defclass']),
+            # 'class' followed by an identifier
+            (r'\bclass\b\s*(\w+)', 1, STYLES['defclass']),
+            # From '#' until a newline
+            (r'#[^\n]*', 0, STYLES['comment']),
+            # From #! to new line
+            (r'#![^\n]*', 0, STYLES['pybang']) ]
+
+        # Build a QRegExp for each pattern
+        self.rules = [(QRegExp(pat), index, fmt)
+            for (pat, index, fmt) in rules]
+
+    def highlightBlock(self, text):
+        """Apply syntax highlighting to the given block of text.
+        """
+        # Do other syntax formatting
+        for expression, nth, format in self.rules:
+            index = expression.indexIn(text, 0)
+
+            while index >= 0:
+                # We actually want the index of the nth match
+                index = expression.pos(nth)
+                length = expression.cap(nth).length()
+                self.setFormat(index, length, format)
+                index = expression.indexIn(text, index + length)
+
+        self.setCurrentBlockState(0)
+
+        # Do multi-line strings
+        in_multiline = self.match_multiline(text, *self.tri_single)
+        if not in_multiline:
+            in_multiline = self.match_multiline(text, *self.tri_double)
+
+
+    def match_multiline(self, text, delimiter, in_state, style):
+        """Do highlighting of multi-line strings. ``delimiter`` should be a
+        ``QRegExp`` for triple-single-quotes or triple-double-quotes, and
+        ``in_state`` should be a unique integer to represent the corresponding
+        state changes when inside those strings. Returns True if we're still
+        inside a multi-line string when this function is finished. """
+        # If inside triple-single quotes, start at 0
+        if self.previousBlockState() == in_state:
+            start = 0
+            add = 0
+        # Otherwise, look for the delimiter on this line
+        else:
+            start = delimiter.indexIn(text)
+            # Move past this match
+            add = delimiter.matchedLength()
+
+        # As long as there's a delimiter match on this line...
+        while start >= 0:
+            # Look for the ending delimiter
+            end = delimiter.indexIn(text, start + add)
+            # Ending delimiter on this line?
+            if end >= add:
+                length = end - start + add + delimiter.matchedLength()
+                self.setCurrentBlockState(0)
+            # No; multi-line string
+            else:
+                self.setCurrentBlockState(in_state)
+                length = text.length() - start + add
+            # Apply formatting
+            self.setFormat(start, length, style)
+            # Look for the next match
+
+            start = delimiter.indexIn(text, start + length)
+
+        # Return True if still inside a multi-line string, False otherwise
+        if self.currentBlockState() == in_state:
+            return True
+        else:
+            return False
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