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__all__ = ['Mark', 'YAMLError', 'MarkedYAMLError']

class Mark:

def __init__(self, name, index, line, column, buffer, pointer):

self.name = name

self.index = index

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 '\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 '\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]

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_mark=None,

problem=None, problem_mark=None, note=None):

self.context = context

self.context_mark = context_mark

self.problem = problem

self.problem_mark = problem_mark

self.note = note

def __str__(self):

lines = []

if self.context is not None:

lines.append(self.context)

if self.context_mark is not None \

and (self.problem is None or self.problem_mark is None

or self.context_mark.name != self.problem_mark.name

or self.context_mark.line != self.problem_mark.line

or self.context_mark.column != self.problem_mark.column):

lines.append(str(self.context_mark))

if self.problem is not None:

lines.append(self.problem)

if self.problem_mark is not None:

lines.append(str(self.problem_mark))

if self.note is not None:

lines.append(self.note)

return '\n'.join(lines)