package YAML::Error;
use strict;
use warnings;
use YAML::Base -base;

#>  __all__ = ['Mark', 'YAMLError', 'MarkedYAMLError']
#>  
#>  class Mark(object):

package YAML::Mark;
use YAML::Base -base;

#>  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

field 'name';
field 'index';
field 'line';
field 'column';
field 'buffer';
field '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

package YAML::Error::Marked;
use YAML::Base -base;

1;

__END__

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)