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class MercurialRepository(Repository):
    """Repository implementation based on the mercurial API.
    This wraps an hg.repository object.  The revision navigation
    follows the branches, and defaults to the first parent/child in
    case there are many.  The eventual other parents/children are
    listed as additional changeset properties.
    """
    def __init__(self, path, params, log, connector):
        self.ui = connector.ui
        self._show_rev = connector.show_rev
        self._node_fmt = connector.node_format
        # TODO 0.13: per repository ui and options
        # -- encoding
        encoding = connector.encoding
        if not encoding:
            encoding = ['utf-8']
        # verify given encodings
        for enc in encoding:
            try:
                u''.encode(enc)
            except LookupError, e:
                log.warning("'[hg] encoding' (%r) not valid", e)
        if 'latin1' not in encoding:
            encoding.append('latin1')
        self.encoding = encoding
        def to_u(s):
            if isinstance(s, unicode):
                return s
            for enc in encoding:
                try:
                    return unicode(s, enc)
                except UnicodeDecodeError:
                    pass
        def to_s(u):
            if isinstance(u, str):
                return u
            for enc in encoding:
                try:
                    return u.encode(enc)
                except UnicodeEncodeError:
                    pass
        self.to_u = to_u
        self.to_s = to_s

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