lib/yaml/marker.py

   1
   2 class Marker:
   3
   4     def __init__(self, source, data, index, line, column):
   5         self.source = source
   6         self.data = data
   7         self.index = index
   8         self.line = line
   9         self.column = column
  10
  11     def get_snippet(self, max_length=79):
  12         if not isinstance(self.data, basestring):
  13             return None
  14         head = ''
  15         start = self.index
  16         while start > 0 and self.data[start-1] not in '\r\n':
  17             start -= 1
  18             if self.index-start > max_length/2-1:
  19                 head = ' ... '
  20                 start += 5
  21                 break
  22         tail = ''
  23         end = self.index
  24         while end < len(self.data) and self.data[end] not in '\r\n':
  25             end += 1
  26             if end-self.index > max_length/2-1:
  27                 tail = ' ... '
  28                 end -= 5
  29                 break
  30         snippet = self.data[start:end]
  31         if isinstance(snippet, unicode):
  32             snippet = snippet.encode('utf-8')
  33         return head + snippet + tail + '\n'  \
  34                 + ' '*(self.index-start+len(head)) + '^' + '\n'
  35