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class Marker:
def __init__(self, source, data, index, row, column):
self.source = source
self.data = data
self.index = index
self.row = row
self.column = column
def get_snippet(self, max_length=79):
if not isinstance(self.data, basestring):
return None
head = ''
start = self.index
while start > 0 and self.data[start-1] not in '\r\n':
start -= 1
if self.index-start > max_length/2-1:
head = ' ... '
start += 5
break
tail = ''
end = self.index
while end < len(self.data) and self.data[end] not in '\r\n':
end += 1
if end-self.index > max_length/2-1:
tail = ' ... '
end -= 5
break
snippet = self.data[start:end]
if isinstance(snippet, unicode):
snippet = snippet.encode('utf-8')
return head + snippet + tail + '\n' \
+ ' '*(self.index-start+len(head)) + '^' + '\n'
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