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    Abstract base class for objects that can be used to compose an SQL string.

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    A `Composable` object made of a sequence of `!Composable`.

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    Example::

        >>> comp = sql.Composed(
        ...     [sql.SQL("insert into "), sql.Identifier("table")])
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        insert into "table"

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    A `Composable` representing a snippet of SQL statement.

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    represent variable identifiers or values: you should only use it to pass
    constant strings representing templates or snippets of SQL statements; use
    other objects such as `Identifier` or `Literal` to represent variable
    parts.

    Example::

        >>> query = sql.SQL("select {0} from {1}").format(
        ...    sql.SQL(', ').join([sql.Identifier('foo'), sql.Identifier('bar')]),
        ...    sql.Identifier('table'))
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        select "foo", "bar" from "table"
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        Merge `Composable` objects into a template.

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        :param `Composable` kwargs: parameters to replace to named (``{name}``)
            placeholders
        :return: the union of the `!SQL` string with placeholders replaced
        :rtype: `Composed`

        The method is similar to the Python `str.format()` method: the string
        template supports auto-numbered (``{}``), numbered (``{0}``,
        ``{1}``...), and named placeholders (``{name}``), with positional
        arguments replacing the numbered placeholders and keywords replacing
        the named ones. However placeholder modifiers (``{0!r}``, ``{0:<10}``)
        are not supported. Only `!Composable` objects can be passed to the
        template.

        Example::

            >>> print(sql.SQL("select * from {} where {} = %s")
            ...     .format(sql.Identifier('people'), sql.Identifier('id'))
            ...     .as_string(conn))
            select * from "people" where "id" = %s

            >>> print(sql.SQL("select * from {tbl} where {pkey} = %s")
            ...     .format(tbl=sql.Identifier('people'), pkey=sql.Identifier('id'))
            ...     .as_string(conn))
            select * from "people" where "id" = %s

        rz(no format specification supported by SQLz%no format conversion supported by SQLNz6cannot switch from automatic field numbering to manualz6cannot switch from manual field numbering to automatic�)	�
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        Join a sequence of `Composable`.

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        Use the `!SQL` object's *string* to separate the elements in *seq*.
        Note that `Composed` objects are iterable too, so they can be used as
        argument for this method.

        Example::

            >>> snip = sql.SQL(', ').join(
            ...     sql.Identifier(n) for n in ['foo', 'bar', 'baz'])
            >>> print(snip.as_string(conn))
            "foo", "bar", "baz"
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Identifiera*
    A `Composable` representing an SQL identifier or a dot-separated sequence.

    Identifiers usually represent names of database objects, such as tables or
    fields. PostgreSQL identifiers follow `different rules`__ than SQL string
    literals for escaping (e.g. they use double quotes instead of single).

    .. __: https://www.postgresql.org/docs/current/static/sql-syntax-lexical.html#         SQL-SYNTAX-IDENTIFIERS

    Example::

        >>> t1 = sql.Identifier("foo")
        >>> t2 = sql.Identifier("ba'r")
        >>> t3 = sql.Identifier('ba"z')
        >>> print(sql.SQL(', ').join([t1, t2, t3]).as_string(conn))
        "foo", "ba'r", "ba""z"

    Multiple strings can be passed to the object to represent a qualified name,
    i.e. a dot-separated sequence of identifiers.

    Example::

        >>> query = sql.SQL("select {} from {}").format(
        ...     sql.Identifier("table", "field"),
        ...     sql.Identifier("schema", "table"))
        >>> print(query.as_string(conn))
        select "table"."field" from "schema"."table"

    c���|std���|D]&}t|t��std����'t���|��dS)NzIdentifier cannot be emptyz$SQL identifier parts must be strings)r0rr@r2r
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H�	������!�!�!�!�!rc��|jS)z5A tuple with the strings wrapped by the `Identifier`.rrs rrbzIdentifier.stringsKrJrc�j�t|j��dkr
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�6N�6N�,O�,O�R�R�R�Rrc�P��d��fd�|jD����S)N�.c3�B�K�|]}tj|���V��dSr)�ext�quote_ident)�.0rcrs  �r�	<genexpr>z'Identifier.as_string.<locals>.<genexpr>^s/�����K�K�����7�3�3�K�K�K�K�K�Kr)r9r	rs `rrzIdentifier.as_string]s,����x�x�K�K�K�K�T�]�K�K�K�K�K�Kr)rr*r+r,r
rCrbrHrrrDrEs@rr`r`"s����������<"�"�"�"�"�����X���F�F��X�F�S�S�S�L�L�L�L�L�L�Lrr`c�.�eZdZdZed���Zd�ZdS)�Literala�
    A `Composable` representing an SQL value to include in a query.

    Usually you will want to include placeholders in the query and pass values
    as `~cursor.execute()` arguments. If however you really really need to
    include a literal value in the query you can use this object.

    The string returned by `!as_string()` follows the normal :ref:`adaptation
    rules <python-types-adaptation>` for Python objects.

    Example::

        >>> s1 = sql.Literal("foo")
        >>> s2 = sql.Literal("ba'r")
        >>> s3 = sql.Literal(42)
        >>> print(sql.SQL(', ').join([s1, s2, s3]).as_string(conn))
        'foo', 'ba''r', 42

    c��|jS)z%The object wrapped by the `!Literal`.rrs rrzLiteral.wrappedurJrc���t|tj��r|}n1t|tj��r|j}nt	d���tj|j��}t|d��r|�|��|�	��}t|t��r*|�tj|j
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,�	H��%�D�D��F�G�G�G��I�d�m�$�$���1�i� � �	�
�I�I�d�O�O�O�
�[�[�]�]���b�%� � �	9����3�=���7�8�8�B��	rN)rr*r+r,rCrrr-rrrsrsasH��������&����X������rrsc�F��eZdZdZd�fd�	Zed���Zd�Zd�Z�xZ	S)�Placeholdera�A `Composable` representing a placeholder for query parameters.

    If the name is specified, generate a named placeholder (e.g. ``%(name)s``),
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    The object is useful to generate SQL queries with a variable number of
    arguments.

    Examples::

        >>> names = ['foo', 'bar', 'baz']

        >>> q1 = sql.SQL("insert into table ({}) values ({})").format(
        ...     sql.SQL(', ').join(map(sql.Identifier, names)),
        ...     sql.SQL(', ').join(sql.Placeholder() * len(names)))
        >>> print(q1.as_string(conn))
        insert into table ("foo", "bar", "baz") values (%s, %s, %s)

        >>> q2 = sql.SQL("insert into table ({}) values ({})").format(
        ...     sql.SQL(', ').join(map(sql.Identifier, names)),
        ...     sql.SQL(', ').join(map(sql.Placeholder, names)))
        >>> print(q2.as_string(conn))
        insert into table ("foo", "bar", "baz") values (%(foo)s, %(bar)s, %(baz)s)

    Nc����t|t��rd|vrtd|�����n|�td|�����t	���|��dS)Nrzinvalid name: z%expected string or None as name, got )rr@rPr0r2r
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��L�D�L�L�M�M�M�
����������rc��|jS)zThe name of the `!Placeholder`.rrs rrWzPlaceholder.name�rJrc�\�|j�|jj�d�S|jj�d|j�d�S)Nz()rr)r	rrrs rrzPlaceholder.__repr__�s<���=� ��n�-�1�1�1�1��n�-�B�B��
�B�B�B�Brc�*�|j�d|j�d�SdS)Nz%(z)sz%srrs  rrzPlaceholder.as_string�s"���=�$�)��
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