slint/api/python/value.rs

// Copyright © SixtyFPS GmbH <info@slint.dev>
// SPDX-License-Identifier: GPL-3.0-only OR LicenseRef-Slint-Royalty-free-1.2 OR LicenseRef-Slint-commercial

use pyo3::prelude::*;
use pyo3::types::{IntoPyDict, PyDict};

pub struct PyValue(pub slint_interpreter::Value);
struct PyValueRef<'a>(&'a slint_interpreter::Value);

impl IntoPy<PyObject> for PyValue {
    fn into_py(self, py: Python<'_>) -> PyObject {
        // Share the conversion code below that operates on the reference
        self.to_object(py).into_py(py)
    }
}

impl ToPyObject for PyValue {
    fn to_object(&self, py: Python<'_>) -> PyObject {
        PyValueRef(&self.0).to_object(py)
    }
}

impl<'a> IntoPy<PyObject> for PyValueRef<'a> {
    fn into_py(self, py: Python<'_>) -> PyObject {
        // Share the conversion code below that operates on the reference
        self.to_object(py).into_py(py)
    }
}

impl<'a> ToPyObject for PyValueRef<'a> {
    fn to_object(&self, py: Python<'_>) -> PyObject {
        match &self.0 {
            slint_interpreter::Value::Void => ().into_py(py),
            slint_interpreter::Value::Number(num) => num.into_py(py),
            slint_interpreter::Value::String(str) => str.into_py(py),
            slint_interpreter::Value::Bool(b) => b.into_py(py),
            slint_interpreter::Value::Image(image) => {
                crate::image::PyImage::from(image).into_py(py)
            }
            slint_interpreter::Value::Model(model) => {
                crate::models::PyModelShared::rust_into_js_model(model)
                    .unwrap_or_else(|| crate::models::ReadOnlyRustModel::from(model).into_py(py))
            }
            slint_interpreter::Value::Struct(structval) => structval
                .iter()
                .map(|(name, val)| (name.to_string().into_py(py), PyValueRef(val).into_py(py)))
                .into_py_dict(py)
                .into_py(py),
            slint_interpreter::Value::Brush(brush) => {
                crate::brush::PyBrush::from(brush.clone()).into_py(py)
            }
            v @ _ => {
                eprintln!("Python: conversion from slint to python needed for {:#?} and not implemented yet", v);
                ().into_py(py)
            }
        }
    }
}

impl FromPyObject<'_> for PyValue {
    fn extract(ob: &PyAny) -> PyResult<Self> {
        if ob.is_none() {
            return Ok(slint_interpreter::Value::Void.into());
        }

        let interpreter_val = ob
            .extract::<bool>()
            .map(|b| slint_interpreter::Value::Bool(b))
            .or_else(|_| {
                ob.extract::<&'_ str>().map(|s| slint_interpreter::Value::String(s.into()))
            })
            .or_else(|_| ob.extract::<f64>().map(|num| slint_interpreter::Value::Number(num)))
            .or_else(|_| {
                ob.extract::<PyRef<'_, crate::image::PyImage>>()
                    .map(|pyimg| slint_interpreter::Value::Image(pyimg.image.clone()))
            })
            .or_else(|_| {
                ob.extract::<PyRef<'_, crate::brush::PyBrush>>()
                    .map(|pybrush| slint_interpreter::Value::Brush(pybrush.brush.clone()))
            })
            .or_else(|_| {
                ob.extract::<PyRef<'_, crate::brush::PyColor>>()
                    .map(|pycolor| slint_interpreter::Value::Brush(pycolor.color.clone().into()))
            })
            .or_else(|_| {
                ob.extract::<PyRef<'_, crate::models::PyModelBase>>()
                    .map(|pymodel| slint_interpreter::Value::Model(pymodel.as_model()))
            })
            .or_else(|_| {
                ob.extract::<PyRef<'_, crate::models::ReadOnlyRustModel>>()
                    .map(|rustmodel| slint_interpreter::Value::Model(rustmodel.0.clone()))
            })
            .or_else(|_| {
                ob.extract::<&PyDict>().and_then(|dict| {
                    let dict_items: Result<Vec<(String, slint_interpreter::Value)>, PyErr> = dict
                        .iter()
                        .map(|(name, pyval)| {
                            let name = name.extract::<&str>()?.to_string();
                            let slintval: PyValue = pyval.extract()?;
                            Ok((name, slintval.0))
                        })
                        .collect::<Result<Vec<(_, _)>, PyErr>>();
                    Ok(slint_interpreter::Value::Struct(slint_interpreter::Struct::from_iter(
                        dict_items?.into_iter(),
                    )))
                })
            })?;

        Ok(PyValue(interpreter_val))
    }
}
impl From<slint_interpreter::Value> for PyValue {
    fn from(value: slint_interpreter::Value) -> Self {
        Self(value)
    }
}