def get_tag_at_cursor(self):
"""Called when encountering a colon.
Finds out which tag was entered and validates it.
"""
right = self.get_buffer().get_property('cursor-position')
text = self.get_full_text()
left = text.rfind(' ', 0, right)
tag = text[left + 1:right]
# Abrreviated tags need to be converted to the full form.
if len(tag) is 1:
tag = query_abbrev_to_full(tag)
# Only process valid tags.
if is_valid_query_tag(tag):
return tag
def apply_colors(self):
"""Called once the buffer contents are changed.
Live-highlighting would be possible, but would be tedious to implement.
"""
# Color the parantheses red:
text = self.get_full_text()
for idx, char in enumerate(text):
if char in '()':
self.apply_tag('red', idx, idx + 1)
# Color the text between quotes green:
for match in self._patterns['qte'].finditer(text):
self.apply_tag('green', *match.span())
# Color all operators slightly blueish:
for match in self._patterns['ops'].finditer(text):
self.apply_tag('blue', *match.span())
# Color all valid tags turquoise, invalid will get red:
for match in self._patterns['tag'].finditer(text):
tag = match.group()[:-1]
is_tag = is_valid_query_tag(tag) or query_abbrev_to_full(tag)
self.apply_tag('tag' if is_tag else 'red', *match.span())
