# Copyright 2018 NextMove Software
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# Software is furnished to do so, subject to the following conditions:
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import textwrap

class Error(Exception):
    """Base class for DeepSMILES exceptions."""
    pass

class DecodeError(Error):
    """Exception raised for errors in the input.

    Attributes:
        expression -- input expression in which the error occurred
        message -- explanation of the error
    """

    def __init__(self, expression, idx, message):
        self.expression = expression
        self.idx = idx
        self.message = message

    def __str__(self):
        return """DeepSMILES cannot be decoded to SMILES
%s:
  %s
  %s^
        """ % ("\n".join(textwrap.wrap(self.message, width=70)), self.expression, " "*self.idx)
