# Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"). You
# may not use this file except in compliance with the License. A copy of
# the License is located at
#
# http://aws.amazon.com/apache2.0/
#
# or in the "license" file accompanying this file. This file is
# distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF
# ANY KIND, either express or implied. See the License for the specific
# language governing permissions and limitations under the License.
import io
from openpulse import ast
from openpulse.printer import Printer
from openqasm3.printer import PrinterState
class _PulsePrinter(Printer):
"""Walks the AST and prints it to an OpenQASM3 string."""
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
def visit_Identifier(self, node: ast.Identifier, context: PrinterState) -> None:
"""Visit an Identifier.
Args:
node (ast.Identifier): The identifier.
context (PrinterState): The printer state context.
"""
self.stream.write(str(node.name))
def visit_ClassicalDeclaration(
self, node: ast.ClassicalDeclaration, context: PrinterState
) -> None:
"""Visit a Classical Declaration.
node.type, node.identifier, node.init_expression
angle[20] a = 1+2;
waveform wf = [];
port a;
Args:
node (ast.ClassicalDeclaration): The classical declaration.
context (PrinterState): The printer state context.
"""
# Skip port declarations in output
if not isinstance(node.type, ast.PortType):
super().visit_ClassicalDeclaration(node, context)
[docs]
def ast_to_qasm(ast: ast.Program) -> str:
"""Converts an AST program to OpenQASM
Args:
ast (ast.Program): The AST program.
Returns:
str: a str representing the OpenPulse program encoding the program.
"""
out = io.StringIO()
_PulsePrinter(out, indent=" ").visit(ast)
return out.getvalue().strip()