# Path: tt/definitions/operators.py
# MAX_OPERATOR_STR_LEN = max(len(k) for k in OPERATOR_MAPPING.keys())
# 
# TT_IMPL_OP = BooleanOperator(_PRECEDENCE['MEDIUM'],
#                              lambda a, b: (not a) or b,
#                              '->', 'impl')
# 
# TT_NOT_OP = BooleanOperator(_PRECEDENCE['HIGH'],
#                             lambda a: not a,
#                             '~', 'not')
# 
# TT_XOR_OP = BooleanOperator(_PRECEDENCE['MEDIUM'],
#                             lambda a, b: a != b,
#                             None, 'xor')
# 
# TT_XNOR_OP = BooleanOperator(_PRECEDENCE['MEDIUM'],
#                              lambda a, b: a == b,
#                              None, 'xnor')
# 
# TT_AND_OP = BooleanOperator(_PRECEDENCE['LOW'],
#                             lambda a, b: a and b,
#                             '/\\', 'and')
# 
# TT_NAND_OP = BooleanOperator(_PRECEDENCE['LOW'],
#                              lambda a, b: not(a and b),
#                              None, 'nand')
# 
# TT_OR_OP = BooleanOperator(_PRECEDENCE['ZERO'],
#                            lambda a, b: a or b,
#                            '\\/', 'or')
# 
# TT_NOR_OP = BooleanOperator(_PRECEDENCE['ZERO'],
#                             lambda a, b: not(a or b),
#                             None, 'nor')
# 
# OPERATOR_MAPPING = {}
# 
# SYMBOLIC_OPERATOR_MAPPING = {
#     '~': TT_NOT_OP,
#     '!': TT_NOT_OP,
# 
#     '->': TT_IMPL_OP,
# 
#     '<->': TT_XNOR_OP,
# 
#     '&&': TT_AND_OP,
#     '&': TT_AND_OP,
#     '/\\': TT_AND_OP,
# 
#     '||': TT_OR_OP,
#     '|': TT_OR_OP,
#     '\\/': TT_OR_OP
# }
# 
# Path: tt/errors/arguments.py
# class InvalidArgumentTypeError(ArgumentError):
#     """An exception type for invalid argument types.
# 
#     To illustrate this error type, let's try passing an invalid argument when
#     creating a :class:`TruthTable <tt.tables.truth_table.TruthTable>`::
# 
#         >>> from tt import TruthTable
#         >>> t = TruthTable(7)
#         Traceback (most recent call last):
#             ...
#         tt.errors.arguments.InvalidArgumentTypeError: Arg `expr` must be of \
# type `str` or `BooleanExpression`
# 
#     """
# 
# class InvalidArgumentValueError(ArgumentError):
#     """An exception type for invalid argument values.
# 
#     Here's an example where we pass a non-power of 2 number of values when
#     attempting to create a :class:`TruthTable \
#     <tt.tables.truth_table.TruthTable>`::
# 
#         >>> from tt import TruthTable
#         >>> t = TruthTable(from_values='01x')
#         Traceback (most recent call last):
#             ...
#         tt.errors.arguments.InvalidArgumentValueError: Must specify a number \
# of input values that is a power of 2
# 
#     """
# 
# Path: tt/errors/state.py
# class RequiresNormalFormError(StateError):
#     """An exception to be raised when expression normal form is required.
# 
#     .. code-block:: python
# 
#         >>> from tt import BooleanExpression
#         >>> b = BooleanExpression('A nand (B or C)')
#         >>> b.is_cnf or b.is_dnf
#         False
#         >>> for clause in b.iter_clauses():
#         ...     print(clause)
#         ...
#         Traceback (most recent call last):
#         tt.errors.state.RequiresNormalFormError: Must be in conjunctive or \
# disjunctive normal form to iterate clauses
# 
#     """


import itertools
from collections import deque
from tt.definitions import (
    MAX_OPERATOR_STR_LEN,
    OPERATOR_MAPPING,
    SYMBOLIC_OPERATOR_MAPPING,
    TT_AND_OP,
    TT_IMPL_OP,
    TT_NAND_OP,
    TT_NOR_OP,
    TT_NOT_OP,
    TT_OR_OP,
    TT_XOR_OP,
    TT_XNOR_OP)
from tt.errors import (
    InvalidArgumentTypeError,
    InvalidArgumentValueError,
    RequiresNormalFormError)

        """
        if not self._is_cnf:
            raise RequiresNormalFormError(
                'Must be in conjunctive normal form to iterate CNF clauses')
        elif (isinstance(self, BinaryOperatorExpressionTreeNode) and
                self._operator == TT_AND_OP):
            child_iter = itertools.chain(
                self._l_child.iter_cnf_clauses(),
                self._r_child.iter_cnf_clauses())
            for node in child_iter:
                yield node
        else:
            yield self

    def iter_dnf_clauses(self):
        """Iterate the clauses in disjunctive normal form order.

        :returns: Iterator of each DNF clause, rooted by a tree node, contained
            within the expression tree rooted at this node.
        :rtype: Iterator[:class:`ExpressionTreeNode`]

        :raises RequiresNormalFormError: If the expression tree rooted at this
            node is not in disjunctive normal form.

        """
        if not self._is_dnf:
            raise RequiresNormalFormError(
                'Must be in conjunctive normal form to iterate DNF clauses')
        elif (isinstance(self, BinaryOperatorExpressionTreeNode) and

# Path: tt/definitions/operators.py
# MAX_OPERATOR_STR_LEN = max(len(k) for k in OPERATOR_MAPPING.keys())
# 
# TT_IMPL_OP = BooleanOperator(_PRECEDENCE['MEDIUM'],
#                              lambda a, b: (not a) or b,
#                              '->', 'impl')
# 
# TT_NOT_OP = BooleanOperator(_PRECEDENCE['HIGH'],
#                             lambda a: not a,
#                             '~', 'not')
# 
# TT_XOR_OP = BooleanOperator(_PRECEDENCE['MEDIUM'],
#                             lambda a, b: a != b,
#                             None, 'xor')
# 
# TT_XNOR_OP = BooleanOperator(_PRECEDENCE['MEDIUM'],
#                              lambda a, b: a == b,
#                              None, 'xnor')
# 
# TT_AND_OP = BooleanOperator(_PRECEDENCE['LOW'],
#                             lambda a, b: a and b,
#                             '/\\', 'and')
# 
# TT_NAND_OP = BooleanOperator(_PRECEDENCE['LOW'],
#                              lambda a, b: not(a and b),
#                              None, 'nand')
# 
# TT_OR_OP = BooleanOperator(_PRECEDENCE['ZERO'],
#                            lambda a, b: a or b,
#                            '\\/', 'or')
# 
# TT_NOR_OP = BooleanOperator(_PRECEDENCE['ZERO'],
#                             lambda a, b: not(a or b),
#                             None, 'nor')
# 
# OPERATOR_MAPPING = {}
# 
# SYMBOLIC_OPERATOR_MAPPING = {
#     '~': TT_NOT_OP,
#     '!': TT_NOT_OP,
# 
#     '->': TT_IMPL_OP,
# 
#     '<->': TT_XNOR_OP,
# 
#     '&&': TT_AND_OP,
#     '&': TT_AND_OP,
#     '/\\': TT_AND_OP,
# 
#     '||': TT_OR_OP,
#     '|': TT_OR_OP,
#     '\\/': TT_OR_OP
# }
# 
# Path: tt/errors/arguments.py
# class InvalidArgumentTypeError(ArgumentError):
#     """An exception type for invalid argument types.
# 
#     To illustrate this error type, let's try passing an invalid argument when
#     creating a :class:`TruthTable <tt.tables.truth_table.TruthTable>`::
# 
#         >>> from tt import TruthTable
#         >>> t = TruthTable(7)
#         Traceback (most recent call last):
#             ...
#         tt.errors.arguments.InvalidArgumentTypeError: Arg `expr` must be of \
# type `str` or `BooleanExpression`
# 
#     """
# 
# class InvalidArgumentValueError(ArgumentError):
#     """An exception type for invalid argument values.
# 
#     Here's an example where we pass a non-power of 2 number of values when
#     attempting to create a :class:`TruthTable \
#     <tt.tables.truth_table.TruthTable>`::
# 
#         >>> from tt import TruthTable
#         >>> t = TruthTable(from_values='01x')
#         Traceback (most recent call last):
#             ...
#         tt.errors.arguments.InvalidArgumentValueError: Must specify a number \
# of input values that is a power of 2
# 
#     """
# 
# Path: tt/errors/state.py
# class RequiresNormalFormError(StateError):
#     """An exception to be raised when expression normal form is required.
# 
#     .. code-block:: python
# 
#         >>> from tt import BooleanExpression
#         >>> b = BooleanExpression('A nand (B or C)')
#         >>> b.is_cnf or b.is_dnf
#         False
#         >>> for clause in b.iter_clauses():
#         ...     print(clause)
#         ...
#         Traceback (most recent call last):
#         tt.errors.state.RequiresNormalFormError: Must be in conjunctive or \
# disjunctive normal form to iterate clauses
# 
#     """


# Path: tt/trees/tree_node.py
import itertools
from collections import deque
from tt.definitions import (
    MAX_OPERATOR_STR_LEN,
    OPERATOR_MAPPING,
    SYMBOLIC_OPERATOR_MAPPING,
    TT_AND_OP,
    TT_IMPL_OP,
    TT_NAND_OP,
    TT_NOR_OP,
    TT_NOT_OP,
    TT_OR_OP,
    TT_XOR_OP,
    TT_XNOR_OP)
from tt.errors import (
    InvalidArgumentTypeError,
    InvalidArgumentValueError,
    RequiresNormalFormError)


        """
        if not self._is_cnf:
            raise RequiresNormalFormError(
                'Must be in conjunctive normal form to iterate CNF clauses')
        elif (isinstance(self, BinaryOperatorExpressionTreeNode) and
                self._operator == TT_AND_OP):
            child_iter = itertools.chain(
                self._l_child.iter_cnf_clauses(),
                self._r_child.iter_cnf_clauses())
            for node in child_iter:
                yield node
        else:
            yield self

    def iter_dnf_clauses(self):
        """Iterate the clauses in disjunctive normal form order.

        :returns: Iterator of each DNF clause, rooted by a tree node, contained
            within the expression tree rooted at this node.
        :rtype: Iterator[:class:`ExpressionTreeNode`]

        :raises RequiresNormalFormError: If the expression tree rooted at this
            node is not in disjunctive normal form.

        """
        if not self._is_dnf:
            raise RequiresNormalFormError(
                'Must be in conjunctive normal form to iterate DNF clauses')
        elif (isinstance(self, BinaryOperatorExpressionTreeNode) and

                self._operator == TT_OR_OP):