Source code for qbraid_qir.qasm3.convert

# Copyright 2025 qBraid
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
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"""
Module containing OpenQASM to QIR conversion functions

"""
from enum import Enum
from typing import Optional, Union

import openqasm3
import pyqasm
from pyqir import Context, Module, qir_module

from .elements import QasmQIRModule, generate_module_id
from .exceptions import Qasm3ConversionError
from .visitor import QasmQIRVisitor


class Profile(Enum):
    """QIR Profile enumeration."""

    BASE = "Base"
    ADAPTIVE = "AdaptiveExecution"

    @classmethod
    def from_input(cls, profile: Union["Profile", str]) -> "Profile":
        """Convert string or Profile enum to Profile enum.

        Args:
            profile: Either a Profile enum instance or a string representation

        Returns:
            Profile enum instance

        Raises:
            NotImplementedError: If string doesn't match any valid profile
            TypeError: If input is neither Profile nor string
        """

        if isinstance(profile, cls):
            return profile
        if isinstance(profile, str):
            try:
                normalized = profile.strip().lower()
                profile_map = {
                    "base": cls.BASE,
                    "adaptive": cls.ADAPTIVE,
                }
                return profile_map[normalized]
            except KeyError as exc:
                valid = [p.value for p in cls]
                raise NotImplementedError(
                    f"Invalid profile: {profile}. Valid profiles are: {valid}"
                ) from exc
        else:
            raise TypeError(f"Profile must be of type Profile or str, not {type(profile).__name__}")


[docs] def qasm3_to_qir( program: Union[openqasm3.ast.Program, str], name: Optional[str] = None, external_gates: Optional[list[str]] = None, profile: Union[Profile, str] = Profile.BASE, **kwargs, ) -> Module: """Converts an OpenQASM 3 program to a PyQIR module. Args: program (openqasm3.ast.Program or str): The OpenQASM 3 program to convert. name (str, optional): Identifier for created QIR module. Auto-generated if not provided. external_gates (list[str], optional): A list of custom gate names that are not natively recognized by pyqasm but should be treated as valid during program unrolling. profile (Profile or str): The specific QIR profile to use for the conversion. Can be Profile.BASE, Profile.ADAPTIVE, or equivalent strings. Defaults to Profile.BASE. Keyword Args: initialize_runtime (bool): Whether to perform quantum runtime environment initialization, defaults to `True`. record_output (bool): Whether to record output calls for registers, defaults to `True`. emit_barrier_calls (bool): Whether to emit barrier calls, defaults to `True`. Returns: The QIR ``pyqir.Module`` representation of the input OpenQASM 3 program. Raises: TypeError: If the input is not a valid OpenQASM 3 program. Qasm3ConversionError: If the conversion fails. NotImplementedError: If string doesn't match any valid profile """ if isinstance(program, openqasm3.ast.Program): program = openqasm3.dumps(program) elif not isinstance(program, str): raise TypeError("Input quantum program must be of type openqasm3.ast.Program or str.") qasm3_module = pyqasm.loads(program) qasm3_module.unroll(external_gates=external_gates) if name is None: name = generate_module_id() llvm_module = qir_module(Context(), name) final_module = QasmQIRModule(name, qasm3_module, llvm_module) # Validate and normalize profile profile_enum = Profile.from_input(profile) # Create visitor with the specified profile visitor = QasmQIRVisitor( profile_name=profile_enum.value, external_gates=external_gates, **kwargs ) final_module.accept(visitor) err = llvm_module.verify() if err is not None: raise Qasm3ConversionError(err) return llvm_module