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__all__ = ['Marker', 'YAMLError', 'MarkedYAMLError']
class Marker:
def __init__(self, name, line, column, buffer, pointer):
self.name = name
self.line = line
self.column = column
self.buffer = buffer
self.pointer = pointer
def get_snippet(self, indent=4, max_length=75):
if self.buffer is None:
return None
head = ''
start = self.pointer
while start > 0 and self.buffer[start-1] not in u'\0\r\n\x85\u2028\u2029':
start -= 1
if self.pointer-start > max_length/2-1:
head = ' ... '
start += 5
break
tail = ''
end = self.pointer
while end < len(self.buffer) and self.buffer[end] not in u'\0\r\n\x85\u2028\u2029':
end += 1
if end-self.pointer > max_length/2-1:
tail = ' ... '
end -= 5
break
snippet = self.buffer[start:end].encode('utf-8')
return ' '*indent + head + snippet + tail + '\n' \
+ ' '*(indent+self.pointer-start+len(head)) + '^'
def __str__(self):
snippet = self.get_snippet()
where = " in \"%s\", line %d, column %d" \
% (self.name, self.line+1, self.column+1)
if snippet is not None:
where += ":\n"+snippet
return where
class YAMLError(Exception):
pass
class MarkedYAMLError(YAMLError):
def __init__(self, context=None, context_marker=None,
problem=None, problem_marker=None):
self.context = context
self.context_marker = context_marker
self.problem = problem
self.problem_marker = problem_marker
def __str__(self):
lines = []
#for (place, marker) in [(self.context, self.context_marker),
# (self.problem, self.problem_marker)]:
# if place is not None:
# lines.append(place)
# if marker is not None:
# lines.append(str(marker))
if self.context is not None:
lines.append(self.context)
if self.context_marker is not None \
and (self.problem is None or self.problem_marker is None
or self.context_marker.name != self.problem_marker.name
or self.context_marker.line != self.problem_marker.line
or self.context_marker.column != self.problem_marker.column):
lines.append(str(self.context_marker))
if self.problem is not None:
lines.append(self.problem)
if self.problem_marker is not None:
lines.append(str(self.problem_marker))
return '\n'.join(lines)
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