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# This code is part of Qiskit.
#
# (C) Copyright IBM 2020.
#
# This code is licensed under the Apache License, Version 2.0. You may
# obtain a copy of this license in the LICENSE.txt file in the root directory
# of this source tree or at http://www.apache.org/licenses/LICENSE-2.0.
#
# Any modifications or derivative works of this code must retain this
# copyright notice, and modified files need to carry a notice indicating
# that they have been altered from the originals.
"""Helper function for converting a dag dependency to a dag circuit"""
from qiskit.dagcircuit.dagcircuit import DAGCircuit
def dagdependency_to_dag(dagdependency):
"""Build a ``DAGCircuit`` object from a ``DAGDependency``.
Args:
dag dependency (DAGDependency): the input dag.
Return:
DAGCircuit: the DAG representing the input circuit.
"""
dagcircuit = DAGCircuit()
dagcircuit.name = dagdependency.name
dagcircuit.metadata = dagdependency.metadata
dagcircuit.add_qubits(dagdependency.qubits)
dagcircuit.add_clbits(dagdependency.clbits)
for register in dagdependency.qregs.values():
dagcircuit.add_qreg(register)
for register in dagdependency.cregs.values():
dagcircuit.add_creg(register)
for node in dagdependency.topological_nodes():
# Get arguments for classical control (if any)
inst = node.op.copy()
dagcircuit.apply_operation_back(inst, node.qargs, node.cargs)
# copy metadata
dagcircuit.global_phase = dagdependency.global_phase
dagcircuit.calibrations = dagdependency.calibrations
return dagcircuit
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