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// Copyright © 2020-2021 HQS Quantum Simulations GmbH. 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. 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, 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.
//! calculator module
//!
//! Converts the qoqo_calculator Calculator struct for parsing string expressions to floats
//! into a Python class.
use crate::convert_into_calculator_float;
use pyo3::exceptions::{PyTypeError, PyValueError};
use pyo3::prelude::*;
use qoqo_calculator::Calculator;
#[pyclass(name = "Calculator", module = "qoqo_calculator_pyo3")]
pub struct CalculatorWrapper {
pub r_calculator: Calculator,
}
#[pymethods]
impl CalculatorWrapper {
/// Create new Python instance of CalculatorWrapper.
///
/// # Returns
///
/// `<Self>` - CalculatorWrapper instance of Calculator
///
#[new]
fn new() -> Self {
let r_calculator = Calculator::new();
CalculatorWrapper { r_calculator }
}
/// Set variable for Calculator.
///
/// # Arguments
///
/// * `variable_string` - string of the variable name
/// * `val` - Float value of the variable
///
fn set(&mut self, variable_string: &str, val: f64) {
self.r_calculator.set_variable(variable_string, val);
}
/// Parse a string expression.
///
/// # Arguments
///
/// * `input` - Expression that is parsed
///
pub fn parse_str_assign(&mut self, input: &str) -> PyResult<f64> {
match self.r_calculator.parse_str_assign(input) {
Ok(x) => Ok(x),
Err(x) => Err(PyValueError::new_err(format!("{x:?}; expression: {input}"))),
}
}
/// Parse a string expression.
///
/// # Arguments
///
/// * `input` - Expression that is parsed
///
pub fn parse_str(&self, input: &str) -> PyResult<f64> {
match self.r_calculator.parse_str(input) {
Ok(x) => Ok(x),
Err(x) => Err(PyValueError::new_err(format!("{x:?}; expression: {input}"))),
}
}
/// Parse an input to float.
///
/// # Arguments
///
/// * `input` - Parsed string CalculatorFloat or returns float value
///
pub fn parse_get(&self, input: &Bound<PyAny>) -> PyResult<f64> {
let converted = convert_into_calculator_float(input)
.map_err(|_| PyTypeError::new_err("Input can not be converted to Calculator Float"))?;
let out = self.r_calculator.parse_get(converted);
match out {
Ok(x) => Ok(x),
Err(x) => Err(PyValueError::new_err(format!("{x:?}"))),
}
}
}
/// Parse a string expression.
///
/// # Arguments
///
/// * `expression` - Expression that is parsed
///
pub fn parse_str_assign(expression: &str) -> PyResult<f64> {
let mut calculator = Calculator::new();
match calculator.parse_str_assign(expression) {
Ok(x) => Ok(x),
Err(x) => Err(PyValueError::new_err(format!(
"{x:?}; expression {expression}"
))),
}
}