slint_interpreter/

api.rs

// Copyright © SixtyFPS GmbH <[email protected]>
// SPDX-License-Identifier: GPL-3.0-only OR LicenseRef-Slint-Royalty-free-2.0 OR LicenseRef-Slint-Software-3.0

use i_slint_compiler::langtype::Type as LangType;
use i_slint_core::component_factory::ComponentFactory;
#[cfg(feature = "internal")]
use i_slint_core::component_factory::FactoryContext;
use i_slint_core::graphics::euclid::approxeq::ApproxEq as _;
use i_slint_core::model::{Model, ModelExt, ModelRc};
#[cfg(feature = "internal")]
use i_slint_core::window::WindowInner;
use i_slint_core::{PathData, SharedVector};
use smol_str::{SmolStr, StrExt};
use std::borrow::Cow;
use std::collections::HashMap;
use std::future::Future;
use std::path::{Path, PathBuf};
use std::rc::Rc;

#[doc(inline)]
pub use i_slint_compiler::diagnostics::{Diagnostic, DiagnosticLevel};

pub use i_slint_core::api::*;
// keep in sync with api/rs/slint/lib.rs
pub use i_slint_backend_selector::api::*;
pub use i_slint_core::graphics::{
    Brush, Color, Image, LoadImageError, Rgb8Pixel, Rgba8Pixel, RgbaColor, SharedPixelBuffer,
};
use i_slint_core::items::*;

use crate::dynamic_item_tree::ErasedItemTreeBox;
#[cfg(any(feature = "internal", target_arch = "wasm32"))]
use crate::dynamic_item_tree::WindowOptions;

/// This enum represents the different public variants of the [`Value`] enum, without
/// the contained values.
#[derive(Debug, Copy, Clone, PartialEq)]
#[repr(i8)]
#[non_exhaustive]
pub enum ValueType {
    /// The variant that expresses the non-type. This is the default.
    Void,
    /// An `int` or a `float` (this is also used for unit based type such as `length` or `angle`)
    Number,
    /// Correspond to the `string` type in .slint
    String,
    /// Correspond to the `bool` type in .slint
    Bool,
    /// A model (that includes array in .slint)
    Model,
    /// An object
    Struct,
    /// Correspond to `brush` or `color` type in .slint.  For color, this is then a [`Brush::SolidColor`]
    Brush,
    /// Correspond to `image` type in .slint.
    Image,
    /// The type is not a public type but something internal.
    #[doc(hidden)]
    Other = -1,
}

impl From<LangType> for ValueType {
    fn from(ty: LangType) -> Self {
        match ty {
            LangType::Float32
            | LangType::Int32
            | LangType::Duration
            | LangType::Angle
            | LangType::PhysicalLength
            | LangType::LogicalLength
            | LangType::Percent
            | LangType::UnitProduct(_) => Self::Number,
            LangType::String => Self::String,
            LangType::Color => Self::Brush,
            LangType::Brush => Self::Brush,
            LangType::Array(_) => Self::Model,
            LangType::Bool => Self::Bool,
            LangType::Struct { .. } => Self::Struct,
            LangType::Void => Self::Void,
            LangType::Image => Self::Image,
            _ => Self::Other,
        }
    }
}

/// This is a dynamically typed value used in the Slint interpreter.
/// It can hold a value of different types, and you should use the
/// [`From`] or [`TryFrom`] traits to access the value.
///
/// ```
/// # use slint_interpreter::*;
/// use core::convert::TryInto;
/// // create a value containing an integer
/// let v = Value::from(100u32);
/// assert_eq!(v.try_into(), Ok(100u32));
/// ```
#[derive(Clone, Default)]
#[non_exhaustive]
#[repr(u8)]
pub enum Value {
    /// There is nothing in this value. That's the default.
    /// For example, a function that do not return a result would return a Value::Void
    #[default]
    Void = 0,
    /// An `int` or a `float` (this is also used for unit based type such as `length` or `angle`)
    Number(f64) = 1,
    /// Correspond to the `string` type in .slint
    String(SharedString) = 2,
    /// Correspond to the `bool` type in .slint
    Bool(bool) = 3,
    /// Correspond to the `image` type in .slint
    Image(Image) = 4,
    /// A model (that includes array in .slint)
    Model(ModelRc<Value>) = 5,
    /// An object
    Struct(Struct) = 6,
    /// Correspond to `brush` or `color` type in .slint.  For color, this is then a [`Brush::SolidColor`]
    Brush(Brush) = 7,
    #[doc(hidden)]
    /// The elements of a path
    PathData(PathData) = 8,
    #[doc(hidden)]
    /// An easing curve
    EasingCurve(i_slint_core::animations::EasingCurve) = 9,
    #[doc(hidden)]
    /// An enumeration, like `TextHorizontalAlignment::align_center`, represented by `("TextHorizontalAlignment", "align_center")`.
    /// FIXME: consider representing that with a number?
    EnumerationValue(String, String) = 10,
    #[doc(hidden)]
    LayoutCache(SharedVector<f32>) = 11,
    #[doc(hidden)]
    /// Correspond to the `component-factory` type in .slint
    ComponentFactory(ComponentFactory) = 12,
}

impl Value {
    /// Returns the type variant that this value holds without the containing value.
    pub fn value_type(&self) -> ValueType {
        match self {
            Value::Void => ValueType::Void,
            Value::Number(_) => ValueType::Number,
            Value::String(_) => ValueType::String,
            Value::Bool(_) => ValueType::Bool,
            Value::Model(_) => ValueType::Model,
            Value::Struct(_) => ValueType::Struct,
            Value::Brush(_) => ValueType::Brush,
            Value::Image(_) => ValueType::Image,
            _ => ValueType::Other,
        }
    }
}

impl PartialEq for Value {
    fn eq(&self, other: &Self) -> bool {
        match self {
            Value::Void => matches!(other, Value::Void),
            Value::Number(lhs) => matches!(other, Value::Number(rhs) if lhs.approx_eq(rhs)),
            Value::String(lhs) => matches!(other, Value::String(rhs) if lhs == rhs),
            Value::Bool(lhs) => matches!(other, Value::Bool(rhs) if lhs == rhs),
            Value::Image(lhs) => matches!(other, Value::Image(rhs) if lhs == rhs),
            Value::Model(lhs) => {
                if let Value::Model(rhs) = other {
                    lhs == rhs
                } else {
                    false
                }
            }
            Value::Struct(lhs) => matches!(other, Value::Struct(rhs) if lhs == rhs),
            Value::Brush(lhs) => matches!(other, Value::Brush(rhs) if lhs == rhs),
            Value::PathData(lhs) => matches!(other, Value::PathData(rhs) if lhs == rhs),
            Value::EasingCurve(lhs) => matches!(other, Value::EasingCurve(rhs) if lhs == rhs),
            Value::EnumerationValue(lhs_name, lhs_value) => {
                matches!(other, Value::EnumerationValue(rhs_name, rhs_value) if lhs_name == rhs_name && lhs_value == rhs_value)
            }
            Value::LayoutCache(lhs) => matches!(other, Value::LayoutCache(rhs) if lhs == rhs),
            Value::ComponentFactory(lhs) => {
                matches!(other, Value::ComponentFactory(rhs) if lhs == rhs)
            }
        }
    }
}

impl std::fmt::Debug for Value {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        match self {
            Value::Void => write!(f, "Value::Void"),
            Value::Number(n) => write!(f, "Value::Number({n:?})"),
            Value::String(s) => write!(f, "Value::String({s:?})"),
            Value::Bool(b) => write!(f, "Value::Bool({b:?})"),
            Value::Image(i) => write!(f, "Value::Image({i:?})"),
            Value::Model(m) => {
                write!(f, "Value::Model(")?;
                f.debug_list().entries(m.iter()).finish()?;
                write!(f, "])")
            }
            Value::Struct(s) => write!(f, "Value::Struct({s:?})"),
            Value::Brush(b) => write!(f, "Value::Brush({b:?})"),
            Value::PathData(e) => write!(f, "Value::PathElements({e:?})"),
            Value::EasingCurve(c) => write!(f, "Value::EasingCurve({c:?})"),
            Value::EnumerationValue(n, v) => write!(f, "Value::EnumerationValue({n:?}, {v:?})"),
            Value::LayoutCache(v) => write!(f, "Value::LayoutCache({v:?})"),
            Value::ComponentFactory(factory) => write!(f, "Value::ComponentFactory({factory:?})"),
        }
    }
}

/// Helper macro to implement the From / TryFrom for Value
///
/// For example
/// `declare_value_conversion!(Number => [u32, u64, i32, i64, f32, f64] );`
/// means that `Value::Number` can be converted to / from each of the said rust types
///
/// For `Value::Object` mapping to a rust `struct`, one can use [`declare_value_struct_conversion!`]
/// And for `Value::EnumerationValue` which maps to a rust `enum`, one can use [`declare_value_struct_conversion!`]
macro_rules! declare_value_conversion {
    ( $value:ident => [$($ty:ty),*] ) => {
        $(
            impl From<$ty> for Value {
                fn from(v: $ty) -> Self {
                    Value::$value(v as _)
                }
            }
            impl TryFrom<Value> for $ty {
                type Error = Value;
                fn try_from(v: Value) -> Result<$ty, Self::Error> {
                    match v {
                        Value::$value(x) => Ok(x as _),
                        _ => Err(v)
                    }
                }
            }
        )*
    };
}
declare_value_conversion!(Number => [u32, u64, i32, i64, f32, f64, usize, isize] );
declare_value_conversion!(String => [SharedString] );
declare_value_conversion!(Bool => [bool] );
declare_value_conversion!(Image => [Image] );
declare_value_conversion!(Struct => [Struct] );
declare_value_conversion!(Brush => [Brush] );
declare_value_conversion!(PathData => [PathData]);
declare_value_conversion!(EasingCurve => [i_slint_core::animations::EasingCurve]);
declare_value_conversion!(LayoutCache => [SharedVector<f32>] );
declare_value_conversion!(ComponentFactory => [ComponentFactory] );

/// Implement From / TryFrom for Value that convert a `struct` to/from `Value::Struct`
macro_rules! declare_value_struct_conversion {
    (struct $name:path { $($field:ident),* $(, ..$extra:expr)? }) => {
        impl From<$name> for Value {
            fn from($name { $($field),* , .. }: $name) -> Self {
                let mut struct_ = Struct::default();
                $(struct_.set_field(stringify!($field).into(), $field.into());)*
                Value::Struct(struct_)
            }
        }
        impl TryFrom<Value> for $name {
            type Error = ();
            fn try_from(v: Value) -> Result<$name, Self::Error> {
                #[allow(clippy::field_reassign_with_default)]
                match v {
                    Value::Struct(x) => {
                        type Ty = $name;
                        #[allow(unused)]
                        let mut res: Ty = Ty::default();
                        $(let mut res: Ty = $extra;)?
                        $(res.$field = x.get_field(stringify!($field)).ok_or(())?.clone().try_into().map_err(|_|())?;)*
                        Ok(res)
                    }
                    _ => Err(()),
                }
            }
        }
    };
    ($(
        $(#[$struct_attr:meta])*
        struct $Name:ident {
            @name = $inner_name:literal
            export {
                $( $(#[$pub_attr:meta])* $pub_field:ident : $pub_type:ty, )*
            }
            private {
                $( $(#[$pri_attr:meta])* $pri_field:ident : $pri_type:ty, )*
            }
        }
    )*) => {
        $(
            impl From<$Name> for Value {
                fn from(item: $Name) -> Self {
                    let mut struct_ = Struct::default();
                    $(struct_.set_field(stringify!($pub_field).into(), item.$pub_field.into());)*
                    $(handle_private!(SET $Name $pri_field, struct_, item);)*
                    Value::Struct(struct_)
                }
            }
            impl TryFrom<Value> for $Name {
                type Error = ();
                fn try_from(v: Value) -> Result<$Name, Self::Error> {
                    #[allow(clippy::field_reassign_with_default)]
                    match v {
                        Value::Struct(x) => {
                            type Ty = $Name;
                            #[allow(unused)]
                            let mut res: Ty = Ty::default();
                            $(res.$pub_field = x.get_field(stringify!($pub_field)).ok_or(())?.clone().try_into().map_err(|_|())?;)*
                            $(handle_private!(GET $Name $pri_field, x, res);)*
                            Ok(res)
                        }
                        _ => Err(()),
                    }
                }
            }
        )*
    };
}

macro_rules! handle_private {
    (SET StateInfo $field:ident, $struct_:ident, $item:ident) => {
        $struct_.set_field(stringify!($field).into(), $item.$field.into())
    };
    (SET $_:ident $field:ident, $struct_:ident, $item:ident) => {{}};
    (GET StateInfo $field:ident, $struct_:ident, $item:ident) => {
        $item.$field =
            $struct_.get_field(stringify!($field)).ok_or(())?.clone().try_into().map_err(|_| ())?
    };
    (GET $_:ident $field:ident, $struct_:ident, $item:ident) => {{}};
}

declare_value_struct_conversion!(struct i_slint_core::layout::LayoutInfo { min, max, min_percent, max_percent, preferred, stretch });
declare_value_struct_conversion!(struct i_slint_core::graphics::Point { x, y, ..Default::default()});
declare_value_struct_conversion!(struct i_slint_core::api::LogicalPosition { x, y });

i_slint_common::for_each_builtin_structs!(declare_value_struct_conversion);

/// Implement From / TryFrom for Value that convert an `enum` to/from `Value::EnumerationValue`
///
/// The `enum` must derive `Display` and `FromStr`
/// (can be done with `strum_macros::EnumString`, `strum_macros::Display` derive macro)
macro_rules! declare_value_enum_conversion {
    ($( $(#[$enum_doc:meta])* enum $Name:ident { $($body:tt)* })*) => { $(
        impl From<i_slint_core::items::$Name> for Value {
            fn from(v: i_slint_core::items::$Name) -> Self {
                Value::EnumerationValue(
                    stringify!($Name).to_owned(),
                    v.to_string().trim_start_matches("r#").replace('_', "-"),
                )
            }
        }
        impl TryFrom<Value> for i_slint_core::items::$Name {
            type Error = ();
            fn try_from(v: Value) -> Result<i_slint_core::items::$Name, ()> {
                use std::str::FromStr;
                match v {
                    Value::EnumerationValue(enumeration, value) => {
                        if enumeration != stringify!($Name) {
                            return Err(());
                        }

                        <i_slint_core::items::$Name>::from_str(value.as_str())
                            .or_else(|_| {
                                let norm = value.as_str().replace('-', "_");
                                <i_slint_core::items::$Name>::from_str(&norm)
                                    .or_else(|_| <i_slint_core::items::$Name>::from_str(&format!("r#{}", norm)))
                            })
                            .map_err(|_| ())
                    }
                    _ => Err(()),
                }
            }
        }
    )*};
}

i_slint_common::for_each_enums!(declare_value_enum_conversion);

impl From<i_slint_core::animations::Instant> for Value {
    fn from(value: i_slint_core::animations::Instant) -> Self {
        Value::Number(value.0 as _)
    }
}
impl TryFrom<Value> for i_slint_core::animations::Instant {
    type Error = ();
    fn try_from(v: Value) -> Result<i_slint_core::animations::Instant, Self::Error> {
        match v {
            Value::Number(x) => Ok(i_slint_core::animations::Instant(x as _)),
            _ => Err(()),
        }
    }
}

impl From<()> for Value {
    #[inline]
    fn from(_: ()) -> Self {
        Value::Void
    }
}
impl TryFrom<Value> for () {
    type Error = ();
    #[inline]
    fn try_from(_: Value) -> Result<(), Self::Error> {
        Ok(())
    }
}

impl From<Color> for Value {
    #[inline]
    fn from(c: Color) -> Self {
        Value::Brush(Brush::SolidColor(c))
    }
}
impl TryFrom<Value> for Color {
    type Error = Value;
    #[inline]
    fn try_from(v: Value) -> Result<Color, Self::Error> {
        match v {
            Value::Brush(Brush::SolidColor(c)) => Ok(c),
            _ => Err(v),
        }
    }
}

impl From<i_slint_core::lengths::LogicalLength> for Value {
    #[inline]
    fn from(l: i_slint_core::lengths::LogicalLength) -> Self {
        Value::Number(l.get() as _)
    }
}
impl TryFrom<Value> for i_slint_core::lengths::LogicalLength {
    type Error = Value;
    #[inline]
    fn try_from(v: Value) -> Result<i_slint_core::lengths::LogicalLength, Self::Error> {
        match v {
            Value::Number(n) => Ok(i_slint_core::lengths::LogicalLength::new(n as _)),
            _ => Err(v),
        }
    }
}

impl<T: Into<Value> + 'static> From<ModelRc<T>> for Value {
    fn from(m: ModelRc<T>) -> Self {
        if let Some(v) = <dyn core::any::Any>::downcast_ref::<ModelRc<Value>>(&m) {
            Value::Model(v.clone())
        } else {
            Value::Model(ModelRc::new(m.map(|v| v.into())))
        }
    }
}
impl<T: TryFrom<Value> + Default + 'static> TryFrom<Value> for ModelRc<T> {
    type Error = Value;
    #[inline]
    fn try_from(v: Value) -> Result<ModelRc<T>, Self::Error> {
        match v {
            Value::Model(m) => {
                if let Some(v) = <dyn core::any::Any>::downcast_ref::<ModelRc<T>>(&m) {
                    Ok(v.clone())
                } else {
                    Ok(ModelRc::new(m.map(|v| T::try_from(v).unwrap_or_default())))
                }
            }
            _ => Err(v),
        }
    }
}

#[test]
fn value_model_conversion() {
    use i_slint_core::model::*;
    let m = ModelRc::new(VecModel::from_slice(&[Value::Number(42.), Value::Number(12.)]));
    let v = Value::from(m.clone());
    assert_eq!(v, Value::Model(m.clone()));
    let m2: ModelRc<Value> = v.clone().try_into().unwrap();
    assert_eq!(m2, m);

    let int_model: ModelRc<i32> = v.clone().try_into().unwrap();
    assert_eq!(int_model.row_count(), 2);
    assert_eq!(int_model.iter().collect::<Vec<_>>(), vec![42, 12]);

    let Value::Model(m3) = int_model.clone().into() else { panic!("not a model?") };
    assert_eq!(m3.row_count(), 2);
    assert_eq!(m3.iter().collect::<Vec<_>>(), vec![Value::Number(42.), Value::Number(12.)]);

    let str_model: ModelRc<SharedString> = v.clone().try_into().unwrap();
    assert_eq!(str_model.row_count(), 2);
    // Value::Int doesn't convert to string, but since the mapping can't report error, we get the default constructed string
    assert_eq!(str_model.iter().collect::<Vec<_>>(), vec!["", ""]);

    let err: Result<ModelRc<Value>, _> = Value::Bool(true).try_into();
    assert!(err.is_err());
}

/// Normalize the identifier to use dashes
pub(crate) fn normalize_identifier(ident: &str) -> Cow<'_, str> {
    if ident.contains('_') {
        ident.replace('_', "-").into()
    } else {
        ident.into()
    }
}

pub(crate) fn normalize_identifier_smolstr(ident: &str) -> SmolStr {
    if ident.contains('_') {
        ident.replace_smolstr("_", "-")
    } else {
        ident.into()
    }
}

/// This type represents a runtime instance of structure in `.slint`.
///
/// This can either be an instance of a name structure introduced
/// with the `struct` keyword in the .slint file, or an anonymous struct
/// written with the `{ key: value, }`  notation.
///
/// It can be constructed with the [`FromIterator`] trait, and converted
/// into or from a [`Value`] with the [`From`], [`TryFrom`] trait
///
///
/// ```
/// # use slint_interpreter::*;
/// use core::convert::TryInto;
/// // Construct a value from a key/value iterator
/// let value : Value = [("foo".into(), 45u32.into()), ("bar".into(), true.into())]
///     .iter().cloned().collect::<Struct>().into();
///
/// // get the properties of a `{ foo: 45, bar: true }`
/// let s : Struct = value.try_into().unwrap();
/// assert_eq!(s.get_field("foo").cloned().unwrap().try_into(), Ok(45u32));
/// ```
#[derive(Clone, PartialEq, Debug, Default)]
pub struct Struct(pub(crate) HashMap<String, Value>);
impl Struct {
    /// Get the value for a given struct field
    pub fn get_field(&self, name: &str) -> Option<&Value> {
        self.0.get(&*normalize_identifier(name))
    }
    /// Set the value of a given struct field
    pub fn set_field(&mut self, name: String, value: Value) {
        if name.contains('_') {
            self.0.insert(name.replace('_', "-"), value);
        } else {
            self.0.insert(name, value);
        }
    }

    /// Iterate over all the fields in this struct
    pub fn iter(&self) -> impl Iterator<Item = (&str, &Value)> {
        self.0.iter().map(|(a, b)| (a.as_str(), b))
    }
}

impl FromIterator<(String, Value)> for Struct {
    fn from_iter<T: IntoIterator<Item = (String, Value)>>(iter: T) -> Self {
        Self(
            iter.into_iter()
                .map(|(s, v)| (if s.contains('_') { s.replace('_', "-") } else { s }, v))
                .collect(),
        )
    }
}

/// ComponentCompiler is deprecated, use [`Compiler`] instead
#[deprecated(note = "Use slint_interpreter::Compiler instead")]
pub struct ComponentCompiler {
    config: i_slint_compiler::CompilerConfiguration,
    diagnostics: Vec<Diagnostic>,
}

#[allow(deprecated)]
impl Default for ComponentCompiler {
    fn default() -> Self {
        let mut config = i_slint_compiler::CompilerConfiguration::new(
            i_slint_compiler::generator::OutputFormat::Interpreter,
        );
        config.components_to_generate = i_slint_compiler::ComponentSelection::LastExported;
        Self { config, diagnostics: vec![] }
    }
}

#[allow(deprecated)]
impl ComponentCompiler {
    /// Returns a new ComponentCompiler.
    pub fn new() -> Self {
        Self::default()
    }

    /// Sets the include paths used for looking up `.slint` imports to the specified vector of paths.
    pub fn set_include_paths(&mut self, include_paths: Vec<std::path::PathBuf>) {
        self.config.include_paths = include_paths;
    }

    /// Returns the include paths the component compiler is currently configured with.
    pub fn include_paths(&self) -> &Vec<std::path::PathBuf> {
        &self.config.include_paths
    }

    /// Sets the library paths used for looking up `@library` imports to the specified map of library names to paths.
    pub fn set_library_paths(&mut self, library_paths: HashMap<String, PathBuf>) {
        self.config.library_paths = library_paths;
    }

    /// Returns the library paths the component compiler is currently configured with.
    pub fn library_paths(&self) -> &HashMap<String, PathBuf> {
        &self.config.library_paths
    }

    /// Sets the style to be used for widgets.
    ///
    /// Use the "material" style as widget style when compiling:
    /// ```rust
    /// use slint_interpreter::{ComponentDefinition, ComponentCompiler, ComponentHandle};
    ///
    /// let mut compiler = ComponentCompiler::default();
    /// compiler.set_style("material".into());
    /// let definition =
    ///     spin_on::spin_on(compiler.build_from_path("hello.slint"));
    /// ```
    pub fn set_style(&mut self, style: String) {
        self.config.style = Some(style);
    }

    /// Returns the widget style the compiler is currently using when compiling .slint files.
    pub fn style(&self) -> Option<&String> {
        self.config.style.as_ref()
    }

    /// The domain used for translations
    pub fn set_translation_domain(&mut self, domain: String) {
        self.config.translation_domain = Some(domain);
    }

    /// Sets the callback that will be invoked when loading imported .slint files. The specified
    /// `file_loader_callback` parameter will be called with a canonical file path as argument
    /// and is expected to return a future that, when resolved, provides the source code of the
    /// .slint file to be imported as a string.
    /// If an error is returned, then the build will abort with that error.
    /// If None is returned, it means the normal resolution algorithm will proceed as if the hook
    /// was not in place (i.e: load from the file system following the include paths)
    pub fn set_file_loader(
        &mut self,
        file_loader_fallback: impl Fn(&Path) -> core::pin::Pin<Box<dyn Future<Output = Option<std::io::Result<String>>>>>
            + 'static,
    ) {
        self.config.open_import_fallback =
            Some(Rc::new(move |path| file_loader_fallback(Path::new(path.as_str()))));
    }

    /// Returns the diagnostics that were produced in the last call to [`Self::build_from_path`] or [`Self::build_from_source`].
    pub fn diagnostics(&self) -> &Vec<Diagnostic> {
        &self.diagnostics
    }

    /// Compile a .slint file into a ComponentDefinition
    ///
    /// Returns the compiled `ComponentDefinition` if there were no errors.
    ///
    /// Any diagnostics produced during the compilation, such as warnings or errors, are collected
    /// in this ComponentCompiler and can be retrieved after the call using the [`Self::diagnostics()`]
    /// function. The [`print_diagnostics`] function can be used to display the diagnostics
    /// to the users.
    ///
    /// Diagnostics from previous calls are cleared when calling this function.
    ///
    /// If the path is `"-"`, the file will be read from stdin.
    /// If the extension of the file .rs, the first `slint!` macro from a rust file will be extracted
    ///
    /// This function is `async` but in practice, this is only asynchronous if
    /// [`Self::set_file_loader`] was called and its future is actually asynchronous.
    /// If that is not used, then it is fine to use a very simple executor, such as the one
    /// provided by the `spin_on` crate
    pub async fn build_from_path<P: AsRef<Path>>(
        &mut self,
        path: P,
    ) -> Option<ComponentDefinition> {
        let path = path.as_ref();
        let source = match i_slint_compiler::diagnostics::load_from_path(path) {
            Ok(s) => s,
            Err(d) => {
                self.diagnostics = vec![d];
                return None;
            }
        };

        let r = crate::dynamic_item_tree::load(source, path.into(), self.config.clone()).await;
        self.diagnostics = r.diagnostics.into_iter().collect();
        r.components.into_values().next()
    }

    /// Compile some .slint code into a ComponentDefinition
    ///
    /// The `path` argument will be used for diagnostics and to compute relative
    /// paths while importing.
    ///
    /// Any diagnostics produced during the compilation, such as warnings or errors, are collected
    /// in this ComponentCompiler and can be retrieved after the call using the [`Self::diagnostics()`]
    /// function. The [`print_diagnostics`] function can be used to display the diagnostics
    /// to the users.
    ///
    /// Diagnostics from previous calls are cleared when calling this function.
    ///
    /// This function is `async` but in practice, this is only asynchronous if
    /// [`Self::set_file_loader`] is set and its future is actually asynchronous.
    /// If that is not used, then it is fine to use a very simple executor, such as the one
    /// provided by the `spin_on` crate
    pub async fn build_from_source(
        &mut self,
        source_code: String,
        path: PathBuf,
    ) -> Option<ComponentDefinition> {
        let r = crate::dynamic_item_tree::load(source_code, path, self.config.clone()).await;
        self.diagnostics = r.diagnostics.into_iter().collect();
        r.components.into_values().next()
    }
}

/// This is the entry point of the crate, it can be used to load a `.slint` file and
/// compile it into a [`CompilationResult`].
pub struct Compiler {
    config: i_slint_compiler::CompilerConfiguration,
}

impl Default for Compiler {
    fn default() -> Self {
        let config = i_slint_compiler::CompilerConfiguration::new(
            i_slint_compiler::generator::OutputFormat::Interpreter,
        );
        Self { config }
    }
}

impl Compiler {
    /// Returns a new Compiler.
    pub fn new() -> Self {
        Self::default()
    }

    /// Allow access to the underlying `CompilerConfiguration`
    ///
    /// This is an internal function without and ABI or API stability guarantees.
    #[doc(hidden)]
    #[cfg(feature = "internal")]
    pub fn compiler_configuration(
        &mut self,
        _: i_slint_core::InternalToken,
    ) -> &mut i_slint_compiler::CompilerConfiguration {
        &mut self.config
    }

    /// Sets the include paths used for looking up `.slint` imports to the specified vector of paths.
    pub fn set_include_paths(&mut self, include_paths: Vec<std::path::PathBuf>) {
        self.config.include_paths = include_paths;
    }

    /// Returns the include paths the component compiler is currently configured with.
    pub fn include_paths(&self) -> &Vec<std::path::PathBuf> {
        &self.config.include_paths
    }

    /// Sets the library paths used for looking up `@library` imports to the specified map of library names to paths.
    pub fn set_library_paths(&mut self, library_paths: HashMap<String, PathBuf>) {
        self.config.library_paths = library_paths;
    }

    /// Returns the library paths the component compiler is currently configured with.
    pub fn library_paths(&self) -> &HashMap<String, PathBuf> {
        &self.config.library_paths
    }

    /// Sets the style to be used for widgets.
    ///
    /// Use the "material" style as widget style when compiling:
    /// ```rust
    /// use slint_interpreter::{ComponentDefinition, Compiler, ComponentHandle};
    ///
    /// let mut compiler = Compiler::default();
    /// compiler.set_style("material".into());
    /// let result = spin_on::spin_on(compiler.build_from_path("hello.slint"));
    /// ```
    pub fn set_style(&mut self, style: String) {
        self.config.style = Some(style);
    }

    /// Returns the widget style the compiler is currently using when compiling .slint files.
    pub fn style(&self) -> Option<&String> {
        self.config.style.as_ref()
    }

    /// The domain used for translations
    pub fn set_translation_domain(&mut self, domain: String) {
        self.config.translation_domain = Some(domain);
    }

    /// Sets the callback that will be invoked when loading imported .slint files. The specified
    /// `file_loader_callback` parameter will be called with a canonical file path as argument
    /// and is expected to return a future that, when resolved, provides the source code of the
    /// .slint file to be imported as a string.
    /// If an error is returned, then the build will abort with that error.
    /// If None is returned, it means the normal resolution algorithm will proceed as if the hook
    /// was not in place (i.e: load from the file system following the include paths)
    pub fn set_file_loader(
        &mut self,
        file_loader_fallback: impl Fn(&Path) -> core::pin::Pin<Box<dyn Future<Output = Option<std::io::Result<String>>>>>
            + 'static,
    ) {
        self.config.open_import_fallback =
            Some(Rc::new(move |path| file_loader_fallback(Path::new(path.as_str()))));
    }

    /// Compile a .slint file
    ///
    /// Returns a structure that holds the diagnostics and the compiled components.
    ///
    /// Any diagnostics produced during the compilation, such as warnings or errors, can be retrieved
    /// after the call using [`CompilationResult::diagnostics()`].
    ///
    /// If the file was compiled without error, the list of component names can be obtained with
    /// [`CompilationResult::component_names`], and the compiled components themselves with
    /// [`CompilationResult::component()`].
    ///
    /// If the path is `"-"`, the file will be read from stdin.
    /// If the extension of the file .rs, the first `slint!` macro from a rust file will be extracted
    ///
    /// This function is `async` but in practice, this is only asynchronous if
    /// [`Self::set_file_loader`] was called and its future is actually asynchronous.
    /// If that is not used, then it is fine to use a very simple executor, such as the one
    /// provided by the `spin_on` crate
    pub async fn build_from_path<P: AsRef<Path>>(&self, path: P) -> CompilationResult {
        let path = path.as_ref();
        let source = match i_slint_compiler::diagnostics::load_from_path(path) {
            Ok(s) => s,
            Err(d) => {
                let mut diagnostics = i_slint_compiler::diagnostics::BuildDiagnostics::default();
                diagnostics.push_compiler_error(d);
                return CompilationResult {
                    components: HashMap::new(),
                    diagnostics: diagnostics.into_iter().collect(),
                    #[cfg(feature = "internal")]
                    structs_and_enums: Vec::new(),
                    #[cfg(feature = "internal")]
                    named_exports: Vec::new(),
                };
            }
        };

        crate::dynamic_item_tree::load(source, path.into(), self.config.clone()).await
    }

    /// Compile some .slint code
    ///
    /// The `path` argument will be used for diagnostics and to compute relative
    /// paths while importing.
    ///
    /// Any diagnostics produced during the compilation, such as warnings or errors, can be retrieved
    /// after the call using [`CompilationResult::diagnostics()`].
    ///
    /// This function is `async` but in practice, this is only asynchronous if
    /// [`Self::set_file_loader`] is set and its future is actually asynchronous.
    /// If that is not used, then it is fine to use a very simple executor, such as the one
    /// provided by the `spin_on` crate
    pub async fn build_from_source(&self, source_code: String, path: PathBuf) -> CompilationResult {
        crate::dynamic_item_tree::load(source_code, path, self.config.clone()).await
    }
}

/// The result of a compilation
///
/// If [`Self::has_errors()`] is true, then the compilation failed.
/// The [`Self::diagnostics()`] function can be used to retrieve the diagnostics (errors and/or warnings)
/// or [`Self::print_diagnostics()`] can be used to print them to stderr.
/// The components can be retrieved using [`Self::components()`]
#[derive(Clone)]
pub struct CompilationResult {
    pub(crate) components: HashMap<String, ComponentDefinition>,
    pub(crate) diagnostics: Vec<Diagnostic>,
    #[cfg(feature = "internal")]
    pub(crate) structs_and_enums: Vec<LangType>,
    /// For `export { Foo as Bar }` this vec contains tuples of (`Foo`, `Bar`)
    #[cfg(feature = "internal")]
    pub(crate) named_exports: Vec<(String, String)>,
}

impl core::fmt::Debug for CompilationResult {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        f.debug_struct("CompilationResult")
            .field("components", &self.components.keys())
            .field("diagnostics", &self.diagnostics)
            .finish()
    }
}

impl CompilationResult {
    /// Returns true if the compilation failed.
    /// The errors can be retrieved using the [`Self::diagnostics()`] function.
    pub fn has_errors(&self) -> bool {
        self.diagnostics().any(|diag| diag.level() == DiagnosticLevel::Error)
    }

    /// Return an iterator over the diagnostics.
    ///
    /// You can also call [`Self::print_diagnostics()`] to output the diagnostics to stderr
    pub fn diagnostics(&self) -> impl Iterator<Item = Diagnostic> + '_ {
        self.diagnostics.iter().cloned()
    }

    /// Print the diagnostics to stderr
    ///
    /// The diagnostics are printed in the same style as rustc errors
    ///
    /// This function is available when the `display-diagnostics` is enabled.
    #[cfg(feature = "display-diagnostics")]
    pub fn print_diagnostics(&self) {
        print_diagnostics(&self.diagnostics)
    }

    /// Returns an iterator over the compiled components.
    pub fn components(&self) -> impl Iterator<Item = ComponentDefinition> + '_ {
        self.components.values().cloned()
    }

    /// Returns the names of the components that were compiled.
    pub fn component_names(&self) -> impl Iterator<Item = &str> + '_ {
        self.components.keys().map(|s| s.as_str())
    }

    /// Return the component definition for the given name.
    /// If the component does not exist, then `None` is returned.
    pub fn component(&self, name: &str) -> Option<ComponentDefinition> {
        self.components.get(name).cloned()
    }

    /// This is an internal function without API stability guarantees.
    #[doc(hidden)]
    #[cfg(feature = "internal")]
    pub fn structs_and_enums(
        &self,
        _: i_slint_core::InternalToken,
    ) -> impl Iterator<Item = &LangType> {
        self.structs_and_enums.iter()
    }

    /// This is an internal function without API stability guarantees.
    /// Returns the list of named export aliases as tuples (`export { Foo as Bar}` is (`Foo`, `Bar` tuple)).
    #[doc(hidden)]
    #[cfg(feature = "internal")]
    pub fn named_exports(
        &self,
        _: i_slint_core::InternalToken,
    ) -> impl Iterator<Item = &(String, String)> {
        self.named_exports.iter()
    }
}

/// ComponentDefinition is a representation of a compiled component from .slint markup.
///
/// It can be constructed from a .slint file using the [`Compiler::build_from_path`] or [`Compiler::build_from_source`] functions.
/// And then it can be instantiated with the [`Self::create`] function.
///
/// The ComponentDefinition acts as a factory to create new instances. When you've finished
/// creating the instances it is safe to drop the ComponentDefinition.
#[derive(Clone)]
pub struct ComponentDefinition {
    pub(crate) inner: crate::dynamic_item_tree::ErasedItemTreeDescription,
}

impl ComponentDefinition {
    /// Creates a new instance of the component and returns a shared handle to it.
    pub fn create(&self) -> Result<ComponentInstance, PlatformError> {
        generativity::make_guard!(guard);
        let instance = self.inner.unerase(guard).clone().create(Default::default())?;
        // Make sure the window adapter is created so call to `window()` do not panic later.
        instance.window_adapter_ref()?;
        Ok(ComponentInstance { inner: instance })
    }

    /// Creates a new instance of the component and returns a shared handle to it.
    #[doc(hidden)]
    #[cfg(feature = "internal")]
    pub fn create_embedded(&self, ctx: FactoryContext) -> Result<ComponentInstance, PlatformError> {
        generativity::make_guard!(guard);
        Ok(ComponentInstance {
            inner: self.inner.unerase(guard).clone().create(WindowOptions::Embed {
                parent_item_tree: ctx.parent_item_tree,
                parent_item_tree_index: ctx.parent_item_tree_index,
            })?,
        })
    }

    /// Instantiate the component for wasm using the given canvas id
    #[cfg(target_arch = "wasm32")]
    pub fn create_with_canvas_id(
        &self,
        canvas_id: &str,
    ) -> Result<ComponentInstance, PlatformError> {
        generativity::make_guard!(guard);
        Ok(ComponentInstance {
            inner: self
                .inner
                .unerase(guard)
                .clone()
                .create(WindowOptions::CreateWithCanvasId(canvas_id.into()))?,
        })
    }

    /// Instantiate the component using an existing window.
    #[doc(hidden)]
    #[cfg(feature = "internal")]
    pub fn create_with_existing_window(
        &self,
        window: &Window,
    ) -> Result<ComponentInstance, PlatformError> {
        generativity::make_guard!(guard);
        Ok(ComponentInstance {
            inner: self.inner.unerase(guard).clone().create(WindowOptions::UseExistingWindow(
                WindowInner::from_pub(window).window_adapter(),
            ))?,
        })
    }

    /// List of publicly declared properties or callback.
    ///
    /// This is internal because it exposes the `Type` from compilerlib.
    #[doc(hidden)]
    #[cfg(feature = "internal")]
    pub fn properties_and_callbacks(
        &self,
    ) -> impl Iterator<
        Item = (
            String,
            (i_slint_compiler::langtype::Type, i_slint_compiler::object_tree::PropertyVisibility),
        ),
    > + '_ {
        // We create here a 'static guard, because unfortunately the returned type would be restricted to the guard lifetime
        // which is not required, but this is safe because there is only one instance of the unerased type
        let guard = unsafe { generativity::Guard::new(generativity::Id::new()) };
        self.inner.unerase(guard).properties().map(|(s, t, v)| (s.to_string(), (t, v)))
    }

    /// Returns an iterator over all publicly declared properties. Each iterator item is a tuple of property name
    /// and property type for each of them.
    pub fn properties(&self) -> impl Iterator<Item = (String, ValueType)> + '_ {
        // We create here a 'static guard, because unfortunately the returned type would be restricted to the guard lifetime
        // which is not required, but this is safe because there is only one instance of the unerased type
        let guard = unsafe { generativity::Guard::new(generativity::Id::new()) };
        self.inner.unerase(guard).properties().filter_map(|(prop_name, prop_type, _)| {
            if prop_type.is_property_type() {
                Some((prop_name.to_string(), prop_type.into()))
            } else {
                None
            }
        })
    }

    /// Returns the names of all publicly declared callbacks.
    pub fn callbacks(&self) -> impl Iterator<Item = String> + '_ {
        // We create here a 'static guard, because unfortunately the returned type would be restricted to the guard lifetime
        // which is not required, but this is safe because there is only one instance of the unerased type
        let guard = unsafe { generativity::Guard::new(generativity::Id::new()) };
        self.inner.unerase(guard).properties().filter_map(|(prop_name, prop_type, _)| {
            if matches!(prop_type, LangType::Callback { .. }) {
                Some(prop_name.to_string())
            } else {
                None
            }
        })
    }

    /// Returns the names of all publicly declared functions.
    pub fn functions(&self) -> impl Iterator<Item = String> + '_ {
        // We create here a 'static guard, because unfortunately the returned type would be restricted to the guard lifetime
        // which is not required, but this is safe because there is only one instance of the unerased type
        let guard = unsafe { generativity::Guard::new(generativity::Id::new()) };
        self.inner.unerase(guard).properties().filter_map(|(prop_name, prop_type, _)| {
            if matches!(prop_type, LangType::Function { .. }) {
                Some(prop_name.to_string())
            } else {
                None
            }
        })
    }

    /// Returns the names of all exported global singletons
    ///
    /// **Note:** Only globals that are exported or re-exported from the main .slint file will
    /// be exposed in the API
    pub fn globals(&self) -> impl Iterator<Item = String> + '_ {
        // We create here a 'static guard, because unfortunately the returned type would be restricted to the guard lifetime
        // which is not required, but this is safe because there is only one instance of the unerased type
        let guard = unsafe { generativity::Guard::new(generativity::Id::new()) };
        self.inner.unerase(guard).global_names().map(|s| s.to_string())
    }

    /// List of publicly declared properties or callback in the exported global singleton specified by its name.
    ///
    /// This is internal because it exposes the `Type` from compilerlib.
    #[doc(hidden)]
    #[cfg(feature = "internal")]
    pub fn global_properties_and_callbacks(
        &self,
        global_name: &str,
    ) -> Option<
        impl Iterator<
                Item = (
                    String,
                    (
                        i_slint_compiler::langtype::Type,
                        i_slint_compiler::object_tree::PropertyVisibility,
                    ),
                ),
            > + '_,
    > {
        // We create here a 'static guard, because unfortunately the returned type would be restricted to the guard lifetime
        // which is not required, but this is safe because there is only one instance of the unerased type
        let guard = unsafe { generativity::Guard::new(generativity::Id::new()) };
        self.inner
            .unerase(guard)
            .global_properties(global_name)
            .map(|o| o.map(|(s, t, v)| (s.to_string(), (t, v))))
    }

    /// List of publicly declared properties in the exported global singleton specified by its name.
    pub fn global_properties(
        &self,
        global_name: &str,
    ) -> Option<impl Iterator<Item = (String, ValueType)> + '_> {
        // We create here a 'static guard, because unfortunately the returned type would be restricted to the guard lifetime
        // which is not required, but this is safe because there is only one instance of the unerased type
        let guard = unsafe { generativity::Guard::new(generativity::Id::new()) };
        self.inner.unerase(guard).global_properties(global_name).map(|iter| {
            iter.filter_map(|(prop_name, prop_type, _)| {
                if prop_type.is_property_type() {
                    Some((prop_name.to_string(), prop_type.into()))
                } else {
                    None
                }
            })
        })
    }

    /// List of publicly declared callbacks in the exported global singleton specified by its name.
    pub fn global_callbacks(&self, global_name: &str) -> Option<impl Iterator<Item = String> + '_> {
        // We create here a 'static guard, because unfortunately the returned type would be restricted to the guard lifetime
        // which is not required, but this is safe because there is only one instance of the unerased type
        let guard = unsafe { generativity::Guard::new(generativity::Id::new()) };
        self.inner.unerase(guard).global_properties(global_name).map(|iter| {
            iter.filter_map(|(prop_name, prop_type, _)| {
                if matches!(prop_type, LangType::Callback { .. }) {
                    Some(prop_name.to_string())
                } else {
                    None
                }
            })
        })
    }

    /// List of publicly declared functions in the exported global singleton specified by its name.
    pub fn global_functions(&self, global_name: &str) -> Option<impl Iterator<Item = String> + '_> {
        // We create here a 'static guard, because unfortunately the returned type would be restricted to the guard lifetime
        // which is not required, but this is safe because there is only one instance of the unerased type
        let guard = unsafe { generativity::Guard::new(generativity::Id::new()) };
        self.inner.unerase(guard).global_properties(global_name).map(|iter| {
            iter.filter_map(|(prop_name, prop_type, _)| {
                if matches!(prop_type, LangType::Function { .. }) {
                    Some(prop_name.to_string())
                } else {
                    None
                }
            })
        })
    }

    /// The name of this Component as written in the .slint file
    pub fn name(&self) -> &str {
        // We create here a 'static guard, because unfortunately the returned type would be restricted to the guard lifetime
        // which is not required, but this is safe because there is only one instance of the unerased type
        let guard = unsafe { generativity::Guard::new(generativity::Id::new()) };
        self.inner.unerase(guard).id()
    }

    /// This gives access to the tree of Elements.
    #[cfg(feature = "internal")]
    #[doc(hidden)]
    pub fn root_component(&self) -> Rc<i_slint_compiler::object_tree::Component> {
        let guard = unsafe { generativity::Guard::new(generativity::Id::new()) };
        self.inner.unerase(guard).original.clone()
    }

    /// Return the `TypeLoader` used when parsing the code in the interpreter.
    ///
    /// WARNING: this is not part of the public API
    #[cfg(feature = "internal-highlight")]
    pub fn type_loader(&self) -> std::rc::Rc<i_slint_compiler::typeloader::TypeLoader> {
        let guard = unsafe { generativity::Guard::new(generativity::Id::new()) };
        self.inner.unerase(guard).type_loader.get().unwrap().clone()
    }

    /// Return the `TypeLoader` used when parsing the code in the interpreter in
    /// a state before most passes were applied by the compiler.
    ///
    /// Each returned type loader is a deep copy of the entire state connected to it,
    /// so this is a fairly expensive function!
    ///
    /// WARNING: this is not part of the public API
    #[cfg(feature = "internal-highlight")]
    pub fn raw_type_loader(&self) -> Option<i_slint_compiler::typeloader::TypeLoader> {
        let guard = unsafe { generativity::Guard::new(generativity::Id::new()) };
        self.inner
            .unerase(guard)
            .raw_type_loader
            .get()
            .unwrap()
            .as_ref()
            .and_then(|tl| i_slint_compiler::typeloader::snapshot(tl))
    }
}

/// Print the diagnostics to stderr
///
/// The diagnostics are printed in the same style as rustc errors
///
/// This function is available when the `display-diagnostics` is enabled.
#[cfg(feature = "display-diagnostics")]
pub fn print_diagnostics(diagnostics: &[Diagnostic]) {
    let mut build_diagnostics = i_slint_compiler::diagnostics::BuildDiagnostics::default();
    for d in diagnostics {
        build_diagnostics.push_compiler_error(d.clone())
    }
    build_diagnostics.print();
}

/// This represent an instance of a dynamic component
///
/// You can create an instance with the [`ComponentDefinition::create`] function.
///
/// Properties and callback can be accessed using the associated functions.
///
/// An instance can be put on screen with the [`ComponentInstance::run`] function.
#[repr(C)]
pub struct ComponentInstance {
    inner: crate::dynamic_item_tree::DynamicComponentVRc,
}

impl ComponentInstance {
    /// Return the [`ComponentDefinition`] that was used to create this instance.
    pub fn definition(&self) -> ComponentDefinition {
        generativity::make_guard!(guard);
        ComponentDefinition { inner: self.inner.unerase(guard).description().into() }
    }

    /// Return the value for a public property of this component.
    ///
    /// ## Examples
    ///
    /// ```
    /// # i_slint_backend_testing::init_no_event_loop();
    /// use slint_interpreter::{ComponentDefinition, Compiler, Value, SharedString};
    /// let code = r#"
    ///     export component MyWin inherits Window {
    ///         in-out property <int> my_property: 42;
    ///     }
    /// "#;
    /// let mut compiler = Compiler::default();
    /// let result = spin_on::spin_on(
    ///     compiler.build_from_source(code.into(), Default::default()));
    /// assert_eq!(result.diagnostics().count(), 0, "{:?}", result.diagnostics().collect::<Vec<_>>());
    /// let instance = result.component("MyWin").unwrap().create().unwrap();
    /// assert_eq!(instance.get_property("my_property").unwrap(), Value::from(42));
    /// ```
    pub fn get_property(&self, name: &str) -> Result<Value, GetPropertyError> {
        generativity::make_guard!(guard);
        let comp = self.inner.unerase(guard);
        let name = normalize_identifier(name);

        if comp
            .description()
            .original
            .root_element
            .borrow()
            .property_declarations
            .get(name.as_ref())
            .is_none_or(|d| !d.expose_in_public_api)
        {
            return Err(GetPropertyError::NoSuchProperty);
        }

        comp.description()
            .get_property(comp.borrow(), &name)
            .map_err(|()| GetPropertyError::NoSuchProperty)
    }

    /// Set the value for a public property of this component.
    pub fn set_property(&self, name: &str, value: Value) -> Result<(), SetPropertyError> {
        let name = normalize_identifier(name);
        generativity::make_guard!(guard);
        let comp = self.inner.unerase(guard);
        let d = comp.description();
        let elem = d.original.root_element.borrow();
        let decl = elem
            .property_declarations
            .get(name.as_ref())
            .ok_or(SetPropertyError::NoSuchProperty)?;

        if !decl.expose_in_public_api {
            return Err(SetPropertyError::NoSuchProperty);
        } else if decl.visibility == i_slint_compiler::object_tree::PropertyVisibility::Output {
            return Err(SetPropertyError::AccessDenied);
        }

        d.set_property(comp.borrow(), &name, value)
    }

    /// Set a handler for the callback with the given name. A callback with that
    /// name must be defined in the document otherwise an error will be returned.
    ///
    /// Note: Since the [`ComponentInstance`] holds the handler, the handler itself should not
    /// contain a strong reference to the instance. So if you need to capture the instance,
    /// you should use [`Self::as_weak`] to create a weak reference.
    ///
    /// ## Examples
    ///
    /// ```
    /// # i_slint_backend_testing::init_no_event_loop();
    /// use slint_interpreter::{Compiler, Value, SharedString, ComponentHandle};
    /// use core::convert::TryInto;
    /// let code = r#"
    ///     export component MyWin inherits Window {
    ///         callback foo(int) -> int;
    ///         in-out property <int> my_prop: 12;
    ///     }
    /// "#;
    /// let result = spin_on::spin_on(
    ///     Compiler::default().build_from_source(code.into(), Default::default()));
    /// assert_eq!(result.diagnostics().count(), 0, "{:?}", result.diagnostics().collect::<Vec<_>>());
    /// let instance = result.component("MyWin").unwrap().create().unwrap();
    /// let instance_weak = instance.as_weak();
    /// instance.set_callback("foo", move |args: &[Value]| -> Value {
    ///     let arg: u32 = args[0].clone().try_into().unwrap();
    ///     let my_prop = instance_weak.unwrap().get_property("my_prop").unwrap();
    ///     let my_prop : u32 = my_prop.try_into().unwrap();
    ///     Value::from(arg + my_prop)
    /// }).unwrap();
    ///
    /// let res = instance.invoke("foo", &[Value::from(500)]).unwrap();
    /// assert_eq!(res, Value::from(500+12));
    /// ```
    pub fn set_callback(
        &self,
        name: &str,
        callback: impl Fn(&[Value]) -> Value + 'static,
    ) -> Result<(), SetCallbackError> {
        generativity::make_guard!(guard);
        let comp = self.inner.unerase(guard);
        comp.description()
            .set_callback_handler(comp.borrow(), &normalize_identifier(name), Box::new(callback))
            .map_err(|()| SetCallbackError::NoSuchCallback)
    }

    /// Call the given callback or function with the arguments
    ///
    /// ## Examples
    /// See the documentation of [`Self::set_callback`] for an example
    pub fn invoke(&self, name: &str, args: &[Value]) -> Result<Value, InvokeError> {
        generativity::make_guard!(guard);
        let comp = self.inner.unerase(guard);
        comp.description()
            .invoke(comp.borrow(), &normalize_identifier_smolstr(name), args)
            .map_err(|()| InvokeError::NoSuchCallable)
    }

    /// Return the value for a property within an exported global singleton used by this component.
    ///
    /// The `global` parameter is the exported name of the global singleton. The `property` argument
    /// is the name of the property
    ///
    /// ## Examples
    ///
    /// ```
    /// # i_slint_backend_testing::init_no_event_loop();
    /// use slint_interpreter::{Compiler, Value, SharedString};
    /// let code = r#"
    ///     global Glob {
    ///         in-out property <int> my_property: 42;
    ///     }
    ///     export { Glob as TheGlobal }
    ///     export component MyWin inherits Window {
    ///     }
    /// "#;
    /// let mut compiler = Compiler::default();
    /// let result = spin_on::spin_on(compiler.build_from_source(code.into(), Default::default()));
    /// assert_eq!(result.diagnostics().count(), 0, "{:?}", result.diagnostics().collect::<Vec<_>>());
    /// let instance = result.component("MyWin").unwrap().create().unwrap();
    /// assert_eq!(instance.get_global_property("TheGlobal", "my_property").unwrap(), Value::from(42));
    /// ```
    pub fn get_global_property(
        &self,
        global: &str,
        property: &str,
    ) -> Result<Value, GetPropertyError> {
        generativity::make_guard!(guard);
        let comp = self.inner.unerase(guard);
        comp.description()
            .get_global(comp.borrow(), &normalize_identifier(global))
            .map_err(|()| GetPropertyError::NoSuchProperty)? // FIXME: should there be a NoSuchGlobal error?
            .as_ref()
            .get_property(&normalize_identifier(property))
            .map_err(|()| GetPropertyError::NoSuchProperty)
    }

    /// Set the value for a property within an exported global singleton used by this component.
    pub fn set_global_property(
        &self,
        global: &str,
        property: &str,
        value: Value,
    ) -> Result<(), SetPropertyError> {
        generativity::make_guard!(guard);
        let comp = self.inner.unerase(guard);
        comp.description()
            .get_global(comp.borrow(), &normalize_identifier(global))
            .map_err(|()| SetPropertyError::NoSuchProperty)? // FIXME: should there be a NoSuchGlobal error?
            .as_ref()
            .set_property(&normalize_identifier(property), value)
    }

    /// Set a handler for the callback in the exported global singleton. A callback with that
    /// name must be defined in the specified global and the global must be exported from the
    /// main document otherwise an error will be returned.
    ///
    /// ## Examples
    ///
    /// ```
    /// # i_slint_backend_testing::init_no_event_loop();
    /// use slint_interpreter::{Compiler, Value, SharedString};
    /// use core::convert::TryInto;
    /// let code = r#"
    ///     export global Logic {
    ///         pure callback to_uppercase(string) -> string;
    ///     }
    ///     export component MyWin inherits Window {
    ///         out property <string> hello: Logic.to_uppercase("world");
    ///     }
    /// "#;
    /// let result = spin_on::spin_on(
    ///     Compiler::default().build_from_source(code.into(), Default::default()));
    /// let instance = result.component("MyWin").unwrap().create().unwrap();
    /// instance.set_global_callback("Logic", "to_uppercase", |args: &[Value]| -> Value {
    ///     let arg: SharedString = args[0].clone().try_into().unwrap();
    ///     Value::from(SharedString::from(arg.to_uppercase()))
    /// }).unwrap();
    ///
    /// let res = instance.get_property("hello").unwrap();
    /// assert_eq!(res, Value::from(SharedString::from("WORLD")));
    ///
    /// let abc = instance.invoke_global("Logic", "to_uppercase", &[
    ///     SharedString::from("abc").into()
    /// ]).unwrap();
    /// assert_eq!(abc, Value::from(SharedString::from("ABC")));
    /// ```
    pub fn set_global_callback(
        &self,
        global: &str,
        name: &str,
        callback: impl Fn(&[Value]) -> Value + 'static,
    ) -> Result<(), SetCallbackError> {
        generativity::make_guard!(guard);
        let comp = self.inner.unerase(guard);
        comp.description()
            .get_global(comp.borrow(), &normalize_identifier(global))
            .map_err(|()| SetCallbackError::NoSuchCallback)? // FIXME: should there be a NoSuchGlobal error?
            .as_ref()
            .set_callback_handler(&normalize_identifier(name), Box::new(callback))
            .map_err(|()| SetCallbackError::NoSuchCallback)
    }

    /// Call the given callback or function within a global singleton with the arguments
    ///
    /// ## Examples
    /// See the documentation of [`Self::set_global_callback`] for an example
    pub fn invoke_global(
        &self,
        global: &str,
        callable_name: &str,
        args: &[Value],
    ) -> Result<Value, InvokeError> {
        generativity::make_guard!(guard);
        let comp = self.inner.unerase(guard);
        let g = comp
            .description()
            .get_global(comp.borrow(), &normalize_identifier(global))
            .map_err(|()| InvokeError::NoSuchCallable)?; // FIXME: should there be a NoSuchGlobal error?
        let callable_name = normalize_identifier_smolstr(callable_name);
        if matches!(
            comp.description()
                .original
                .root_element
                .borrow()
                .lookup_property(&callable_name)
                .property_type,
            LangType::Function { .. }
        ) {
            g.as_ref()
                .eval_function(&callable_name, args.to_vec())
                .map_err(|()| InvokeError::NoSuchCallable)
        } else {
            g.as_ref()
                .invoke_callback(&callable_name, args)
                .map_err(|()| InvokeError::NoSuchCallable)
        }
    }

    /// Find all positions of the components which are pointed by a given source location.
    ///
    /// WARNING: this is not part of the public API
    #[cfg(feature = "internal-highlight")]
    pub fn component_positions(
        &self,
        path: &Path,
        offset: u32,
    ) -> Vec<i_slint_core::lengths::LogicalRect> {
        crate::highlight::component_positions(&self.inner, path, offset)
    }

    /// Find the position of the `element`.
    ///
    /// WARNING: this is not part of the public API
    #[cfg(feature = "internal-highlight")]
    pub fn element_positions(
        &self,
        element: &i_slint_compiler::object_tree::ElementRc,
    ) -> Vec<i_slint_core::lengths::LogicalRect> {
        crate::highlight::element_positions(
            &self.inner,
            element,
            crate::highlight::ElementPositionFilter::IncludeClipped,
        )
    }

    /// Find the the `element` that was defined at the text position.
    ///
    /// WARNING: this is not part of the public API
    #[cfg(feature = "internal-highlight")]
    pub fn element_node_at_source_code_position(
        &self,
        path: &Path,
        offset: u32,
    ) -> Vec<(i_slint_compiler::object_tree::ElementRc, usize)> {
        crate::highlight::element_node_at_source_code_position(&self.inner, path, offset)
    }
}

impl ComponentHandle for ComponentInstance {
    type Inner = crate::dynamic_item_tree::ErasedItemTreeBox;

    fn as_weak(&self) -> Weak<Self>
    where
        Self: Sized,
    {
        Weak::new(&self.inner)
    }

    fn clone_strong(&self) -> Self {
        Self { inner: self.inner.clone() }
    }

    fn from_inner(
        inner: vtable::VRc<i_slint_core::item_tree::ItemTreeVTable, Self::Inner>,
    ) -> Self {
        Self { inner }
    }

    fn show(&self) -> Result<(), PlatformError> {
        self.inner.window_adapter_ref()?.window().show()
    }

    fn hide(&self) -> Result<(), PlatformError> {
        self.inner.window_adapter_ref()?.window().hide()
    }

    fn run(&self) -> Result<(), PlatformError> {
        self.show()?;
        run_event_loop()?;
        self.hide()
    }

    fn window(&self) -> &Window {
        self.inner.window_adapter_ref().unwrap().window()
    }

    fn global<'a, T: Global<'a, Self>>(&'a self) -> T
    where
        Self: Sized,
    {
        unreachable!()
    }
}

impl From<ComponentInstance>
    for vtable::VRc<i_slint_core::item_tree::ItemTreeVTable, ErasedItemTreeBox>
{
    fn from(value: ComponentInstance) -> Self {
        value.inner
    }
}

/// Error returned by [`ComponentInstance::get_property`]
#[derive(Debug, Clone, Copy, PartialEq, Eq, derive_more::Error, derive_more::Display)]
#[non_exhaustive]
pub enum GetPropertyError {
    /// There is no property with the given name
    #[display("no such property")]
    NoSuchProperty,
}

/// Error returned by [`ComponentInstance::set_property`]
#[derive(Debug, Clone, Copy, PartialEq, Eq, derive_more::Error, derive_more::Display)]
#[non_exhaustive]
pub enum SetPropertyError {
    /// There is no property with the given name.
    #[display("no such property")]
    NoSuchProperty,
    /// The property exists but does not have a type matching the dynamic value.
    ///
    /// This happens for example when assigning a source struct value to a target
    /// struct property, where the source doesn't have all the fields the target struct
    /// requires.
    #[display("wrong type")]
    WrongType,
    /// Attempt to set an output property.
    #[display("access denied")]
    AccessDenied,
}

/// Error returned by [`ComponentInstance::set_callback`]
#[derive(Debug, Clone, Copy, PartialEq, Eq, derive_more::Error, derive_more::Display)]
#[non_exhaustive]
pub enum SetCallbackError {
    /// There is no callback with the given name
    #[display("no such callback")]
    NoSuchCallback,
}

/// Error returned by [`ComponentInstance::invoke`]
#[derive(Debug, Clone, Copy, PartialEq, Eq, derive_more::Error, derive_more::Display)]
#[non_exhaustive]
pub enum InvokeError {
    /// There is no callback or function with the given name
    #[display("no such callback or function")]
    NoSuchCallable,
}

/// Enters the main event loop. This is necessary in order to receive
/// events from the windowing system in order to render to the screen
/// and react to user input.
pub fn run_event_loop() -> Result<(), PlatformError> {
    i_slint_backend_selector::with_platform(|b| b.run_event_loop())
}

/// Spawns a [`Future`] to execute in the Slint event loop.
///
/// See the documentation of `slint::spawn_local()` for more info
pub fn spawn_local<F: Future + 'static>(fut: F) -> Result<JoinHandle<F::Output>, EventLoopError> {
    i_slint_backend_selector::with_global_context(|ctx| ctx.spawn_local(fut))
        .map_err(|_| EventLoopError::NoEventLoopProvider)?
}

#[cfg(all(feature = "internal", target_arch = "wasm32"))]
/// Spawn the event loop.
///
/// Like [`run_event_loop()`], but returns immediately as the loop is running within
/// the browser's runtime
pub fn spawn_event_loop() -> Result<(), PlatformError> {
    i_slint_backend_selector::with_platform(|_| i_slint_backend_winit::spawn_event_loop())
}

/// This module contains a few functions used by the tests
#[doc(hidden)]
pub mod testing {
    use super::ComponentHandle;
    use i_slint_core::window::WindowInner;

    /// Wrapper around [`i_slint_core::tests::slint_send_mouse_click`]
    pub fn send_mouse_click(comp: &super::ComponentInstance, x: f32, y: f32) {
        i_slint_core::tests::slint_send_mouse_click(
            x,
            y,
            &WindowInner::from_pub(comp.window()).window_adapter(),
        );
    }

    /// Wrapper around [`i_slint_core::tests::slint_send_keyboard_char`]
    pub fn send_keyboard_char(
        comp: &super::ComponentInstance,
        string: i_slint_core::SharedString,
        pressed: bool,
    ) {
        i_slint_core::tests::slint_send_keyboard_char(
            &string,
            pressed,
            &WindowInner::from_pub(comp.window()).window_adapter(),
        );
    }
    /// Wrapper around [`i_slint_core::tests::send_keyboard_string_sequence`]
    pub fn send_keyboard_string_sequence(
        comp: &super::ComponentInstance,
        string: i_slint_core::SharedString,
    ) {
        i_slint_core::tests::send_keyboard_string_sequence(
            &string,
            &WindowInner::from_pub(comp.window()).window_adapter(),
        );
    }
}

#[test]
fn component_definition_properties() {
    i_slint_backend_testing::init_no_event_loop();
    let mut compiler = Compiler::default();
    compiler.set_style("fluent".into());
    let comp_def = spin_on::spin_on(
        compiler.build_from_source(
            r#"
    export component Dummy {
        in-out property <string> test;
        in-out property <int> underscores-and-dashes_preserved: 44;
        callback hello;
    }"#
            .into(),
            "".into(),
        ),
    )
    .component("Dummy")
    .unwrap();

    let props = comp_def.properties().collect::<Vec<(_, _)>>();

    assert_eq!(props.len(), 2);
    assert_eq!(props[0].0, "test");
    assert_eq!(props[0].1, ValueType::String);
    assert_eq!(props[1].0, "underscores-and-dashes_preserved");
    assert_eq!(props[1].1, ValueType::Number);

    let instance = comp_def.create().unwrap();
    assert_eq!(instance.get_property("underscores_and-dashes-preserved"), Ok(Value::Number(44.)));
    assert_eq!(
        instance.get_property("underscoresanddashespreserved"),
        Err(GetPropertyError::NoSuchProperty)
    );
    assert_eq!(
        instance.set_property("underscores-and_dashes-preserved", Value::Number(88.)),
        Ok(())
    );
    assert_eq!(
        instance.set_property("underscoresanddashespreserved", Value::Number(99.)),
        Err(SetPropertyError::NoSuchProperty)
    );
    assert_eq!(
        instance.set_property("underscores-and_dashes-preserved", Value::String("99".into())),
        Err(SetPropertyError::WrongType)
    );
    assert_eq!(instance.get_property("underscores-and-dashes-preserved"), Ok(Value::Number(88.)));
}

#[test]
fn component_definition_properties2() {
    i_slint_backend_testing::init_no_event_loop();
    let mut compiler = Compiler::default();
    compiler.set_style("fluent".into());
    let comp_def = spin_on::spin_on(
        compiler.build_from_source(
            r#"
    export component Dummy {
        in-out property <string> sub-text <=> sub.text;
        sub := Text { property <int> private-not-exported; }
        out property <string> xreadonly: "the value";
        private property <string> xx: sub.text;
        callback hello;
    }"#
            .into(),
            "".into(),
        ),
    )
    .component("Dummy")
    .unwrap();

    let props = comp_def.properties().collect::<Vec<(_, _)>>();

    assert_eq!(props.len(), 2);
    assert_eq!(props[0].0, "sub-text");
    assert_eq!(props[0].1, ValueType::String);
    assert_eq!(props[1].0, "xreadonly");

    let callbacks = comp_def.callbacks().collect::<Vec<_>>();
    assert_eq!(callbacks.len(), 1);
    assert_eq!(callbacks[0], "hello");

    let instance = comp_def.create().unwrap();
    assert_eq!(
        instance.set_property("xreadonly", SharedString::from("XXX").into()),
        Err(SetPropertyError::AccessDenied)
    );
    assert_eq!(instance.get_property("xreadonly"), Ok(Value::String("the value".into())));
    assert_eq!(
        instance.set_property("xx", SharedString::from("XXX").into()),
        Err(SetPropertyError::NoSuchProperty)
    );
    assert_eq!(
        instance.set_property("background", Value::default()),
        Err(SetPropertyError::NoSuchProperty)
    );

    assert_eq!(instance.get_property("background"), Err(GetPropertyError::NoSuchProperty));
    assert_eq!(instance.get_property("xx"), Err(GetPropertyError::NoSuchProperty));
}

#[test]
fn globals() {
    i_slint_backend_testing::init_no_event_loop();
    let mut compiler = Compiler::default();
    compiler.set_style("fluent".into());
    let definition = spin_on::spin_on(
        compiler.build_from_source(
            r#"
    export global My-Super_Global {
        in-out property <int> the-property : 21;
        callback my-callback();
    }
    export { My-Super_Global as AliasedGlobal }
    export component Dummy {
    }"#
            .into(),
            "".into(),
        ),
    )
    .component("Dummy")
    .unwrap();

    assert_eq!(definition.globals().collect::<Vec<_>>(), vec!["My-Super_Global", "AliasedGlobal"]);

    assert!(definition.global_properties("not-there").is_none());
    {
        let expected_properties = vec![("the-property".to_string(), ValueType::Number)];
        let expected_callbacks = vec!["my-callback".to_string()];

        let assert_properties_and_callbacks = |global_name| {
            assert_eq!(
                definition
                    .global_properties(global_name)
                    .map(|props| props.collect::<Vec<_>>())
                    .as_ref(),
                Some(&expected_properties)
            );
            assert_eq!(
                definition
                    .global_callbacks(global_name)
                    .map(|props| props.collect::<Vec<_>>())
                    .as_ref(),
                Some(&expected_callbacks)
            );
        };

        assert_properties_and_callbacks("My-Super-Global");
        assert_properties_and_callbacks("My_Super-Global");
        assert_properties_and_callbacks("AliasedGlobal");
    }

    let instance = definition.create().unwrap();
    assert_eq!(
        instance.set_global_property("My_Super-Global", "the_property", Value::Number(44.)),
        Ok(())
    );
    assert_eq!(
        instance.set_global_property("AliasedGlobal", "the_property", Value::Number(44.)),
        Ok(())
    );
    assert_eq!(
        instance.set_global_property("DontExist", "the-property", Value::Number(88.)),
        Err(SetPropertyError::NoSuchProperty)
    );

    assert_eq!(
        instance.set_global_property("My_Super-Global", "theproperty", Value::Number(88.)),
        Err(SetPropertyError::NoSuchProperty)
    );
    assert_eq!(
        instance.set_global_property("AliasedGlobal", "theproperty", Value::Number(88.)),
        Err(SetPropertyError::NoSuchProperty)
    );
    assert_eq!(
        instance.set_global_property("My_Super-Global", "the_property", Value::String("88".into())),
        Err(SetPropertyError::WrongType)
    );
    assert_eq!(
        instance.get_global_property("My-Super_Global", "yoyo"),
        Err(GetPropertyError::NoSuchProperty)
    );
    assert_eq!(
        instance.get_global_property("My-Super_Global", "the-property"),
        Ok(Value::Number(44.))
    );

    assert_eq!(
        instance.set_property("the-property", Value::Void),
        Err(SetPropertyError::NoSuchProperty)
    );
    assert_eq!(instance.get_property("the-property"), Err(GetPropertyError::NoSuchProperty));

    assert_eq!(
        instance.set_global_callback("DontExist", "the-property", |_| panic!()),
        Err(SetCallbackError::NoSuchCallback)
    );
    assert_eq!(
        instance.set_global_callback("My_Super_Global", "the-property", |_| panic!()),
        Err(SetCallbackError::NoSuchCallback)
    );
    assert_eq!(
        instance.set_global_callback("My_Super_Global", "yoyo", |_| panic!()),
        Err(SetCallbackError::NoSuchCallback)
    );

    assert_eq!(
        instance.invoke_global("DontExist", "the-property", &[]),
        Err(InvokeError::NoSuchCallable)
    );
    assert_eq!(
        instance.invoke_global("My_Super_Global", "the-property", &[]),
        Err(InvokeError::NoSuchCallable)
    );
    assert_eq!(
        instance.invoke_global("My_Super_Global", "yoyo", &[]),
        Err(InvokeError::NoSuchCallable)
    );
}

#[test]
fn call_functions() {
    i_slint_backend_testing::init_no_event_loop();
    let mut compiler = Compiler::default();
    compiler.set_style("fluent".into());
    let definition = spin_on::spin_on(
        compiler.build_from_source(
            r#"
    export global Gl {
        out property<string> q;
        public function foo-bar(a-a: string, b-b:int) -> string {
            q = a-a;
            return a-a + b-b;
        }
    }
    export component Test {
        out property<int> p;
        public function foo-bar(a: int, b:int) -> int {
            p = a;
            return a + b;
        }
    }"#
            .into(),
            "".into(),
        ),
    )
    .component("Test")
    .unwrap();

    assert_eq!(definition.functions().collect::<Vec<_>>(), ["foo-bar"]);
    assert_eq!(definition.global_functions("Gl").unwrap().collect::<Vec<_>>(), ["foo-bar"]);

    let instance = definition.create().unwrap();

    assert_eq!(
        instance.invoke("foo_bar", &[Value::Number(3.), Value::Number(4.)]),
        Ok(Value::Number(7.))
    );
    assert_eq!(instance.invoke("p", &[]), Err(InvokeError::NoSuchCallable));
    assert_eq!(instance.get_property("p"), Ok(Value::Number(3.)));

    assert_eq!(
        instance.invoke_global(
            "Gl",
            "foo_bar",
            &[Value::String("Hello".into()), Value::Number(10.)]
        ),
        Ok(Value::String("Hello10".into()))
    );
    assert_eq!(instance.get_global_property("Gl", "q"), Ok(Value::String("Hello".into())));
}

#[test]
fn component_definition_struct_properties() {
    i_slint_backend_testing::init_no_event_loop();
    let mut compiler = Compiler::default();
    compiler.set_style("fluent".into());
    let comp_def = spin_on::spin_on(
        compiler.build_from_source(
            r#"
    export struct Settings {
        string_value: string,
    }
    export component Dummy {
        in-out property <Settings> test;
    }"#
            .into(),
            "".into(),
        ),
    )
    .component("Dummy")
    .unwrap();

    let props = comp_def.properties().collect::<Vec<(_, _)>>();

    assert_eq!(props.len(), 1);
    assert_eq!(props[0].0, "test");
    assert_eq!(props[0].1, ValueType::Struct);

    let instance = comp_def.create().unwrap();

    let valid_struct: Struct =
        [("string_value".to_string(), Value::String("hello".into()))].iter().cloned().collect();

    assert_eq!(instance.set_property("test", Value::Struct(valid_struct.clone())), Ok(()));
    assert_eq!(instance.get_property("test").unwrap().value_type(), ValueType::Struct);

    assert_eq!(instance.set_property("test", Value::Number(42.)), Err(SetPropertyError::WrongType));

    let mut invalid_struct = valid_struct.clone();
    invalid_struct.set_field("other".into(), Value::Number(44.));
    assert_eq!(
        instance.set_property("test", Value::Struct(invalid_struct)),
        Err(SetPropertyError::WrongType)
    );
    let mut invalid_struct = valid_struct;
    invalid_struct.set_field("string_value".into(), Value::Number(44.));
    assert_eq!(
        instance.set_property("test", Value::Struct(invalid_struct)),
        Err(SetPropertyError::WrongType)
    );
}

#[test]
fn component_definition_model_properties() {
    use i_slint_core::model::*;
    i_slint_backend_testing::init_no_event_loop();
    let mut compiler = Compiler::default();
    compiler.set_style("fluent".into());
    let comp_def = spin_on::spin_on(compiler.build_from_source(
        "export component Dummy { in-out property <[int]> prop: [42, 12]; }".into(),
        "".into(),
    ))
    .component("Dummy")
    .unwrap();

    let props = comp_def.properties().collect::<Vec<(_, _)>>();
    assert_eq!(props.len(), 1);
    assert_eq!(props[0].0, "prop");
    assert_eq!(props[0].1, ValueType::Model);

    let instance = comp_def.create().unwrap();

    let int_model =
        Value::Model([Value::Number(14.), Value::Number(15.), Value::Number(16.)].into());
    let empty_model = Value::Model(ModelRc::new(VecModel::<Value>::default()));
    let model_with_string = Value::Model(VecModel::from_slice(&[
        Value::Number(1000.),
        Value::String("foo".into()),
        Value::Number(1111.),
    ]));

    #[track_caller]
    fn check_model(val: Value, r: &[f64]) {
        if let Value::Model(m) = val {
            assert_eq!(r.len(), m.row_count());
            for (i, v) in r.iter().enumerate() {
                assert_eq!(m.row_data(i).unwrap(), Value::Number(*v));
            }
        } else {
            panic!("{val:?} not a model");
        }
    }

    assert_eq!(instance.get_property("prop").unwrap().value_type(), ValueType::Model);
    check_model(instance.get_property("prop").unwrap(), &[42., 12.]);

    instance.set_property("prop", int_model).unwrap();
    check_model(instance.get_property("prop").unwrap(), &[14., 15., 16.]);

    assert_eq!(instance.set_property("prop", Value::Number(42.)), Err(SetPropertyError::WrongType));
    check_model(instance.get_property("prop").unwrap(), &[14., 15., 16.]);
    assert_eq!(instance.set_property("prop", model_with_string), Err(SetPropertyError::WrongType));
    check_model(instance.get_property("prop").unwrap(), &[14., 15., 16.]);

    assert_eq!(instance.set_property("prop", empty_model), Ok(()));
    check_model(instance.get_property("prop").unwrap(), &[]);
}

#[test]
fn lang_type_to_value_type() {
    use i_slint_compiler::langtype::Struct as LangStruct;
    use std::collections::BTreeMap;

    assert_eq!(ValueType::from(LangType::Void), ValueType::Void);
    assert_eq!(ValueType::from(LangType::Float32), ValueType::Number);
    assert_eq!(ValueType::from(LangType::Int32), ValueType::Number);
    assert_eq!(ValueType::from(LangType::Duration), ValueType::Number);
    assert_eq!(ValueType::from(LangType::Angle), ValueType::Number);
    assert_eq!(ValueType::from(LangType::PhysicalLength), ValueType::Number);
    assert_eq!(ValueType::from(LangType::LogicalLength), ValueType::Number);
    assert_eq!(ValueType::from(LangType::Percent), ValueType::Number);
    assert_eq!(ValueType::from(LangType::UnitProduct(vec![])), ValueType::Number);
    assert_eq!(ValueType::from(LangType::String), ValueType::String);
    assert_eq!(ValueType::from(LangType::Color), ValueType::Brush);
    assert_eq!(ValueType::from(LangType::Brush), ValueType::Brush);
    assert_eq!(ValueType::from(LangType::Array(Rc::new(LangType::Void))), ValueType::Model);
    assert_eq!(ValueType::from(LangType::Bool), ValueType::Bool);
    assert_eq!(
        ValueType::from(LangType::Struct(Rc::new(LangStruct {
            fields: BTreeMap::default(),
            name: None,
            node: None,
            rust_attributes: None
        }))),
        ValueType::Struct
    );
    assert_eq!(ValueType::from(LangType::Image), ValueType::Image);
}

#[test]
fn test_multi_components() {
    let result = spin_on::spin_on(
        Compiler::default().build_from_source(
            r#"
        export struct Settings {
            string_value: string,
        }
        export global ExpGlo { in-out property <int> test: 42; }
        component Common {
            in-out property <Settings> settings: { string_value: "Hello", };
        }
        export component Xyz inherits Window {
            in-out property <int> aaa: 8;
        }
        export component Foo {

            in-out property <int> test: 42;
            c := Common {}
        }
        export component Bar inherits Window {
            in-out property <int> blah: 78;
            c := Common {}
        }
        "#
            .into(),
            PathBuf::from("hello.slint"),
        ),
    );

    assert!(!result.has_errors(), "Error {:?}", result.diagnostics().collect::<Vec<_>>());
    let mut components = result.component_names().collect::<Vec<_>>();
    components.sort();
    assert_eq!(components, vec!["Bar", "Xyz"]);
    let diag = result.diagnostics().collect::<Vec<_>>();
    assert_eq!(diag.len(), 1);
    assert_eq!(diag[0].level(), DiagnosticLevel::Warning);
    assert_eq!(
        diag[0].message(),
        "Exported component 'Foo' doesn't inherit Window. No code will be generated for it"
    );

    let comp1 = result.component("Xyz").unwrap();
    assert_eq!(comp1.name(), "Xyz");
    let instance1a = comp1.create().unwrap();
    let comp2 = result.component("Bar").unwrap();
    let instance2 = comp2.create().unwrap();
    let instance1b = comp1.create().unwrap();

    // globals are not shared between instances
    assert_eq!(instance1a.get_global_property("ExpGlo", "test"), Ok(Value::Number(42.0)));
    assert_eq!(instance1a.set_global_property("ExpGlo", "test", Value::Number(88.0)), Ok(()));
    assert_eq!(instance2.get_global_property("ExpGlo", "test"), Ok(Value::Number(42.0)));
    assert_eq!(instance1b.get_global_property("ExpGlo", "test"), Ok(Value::Number(42.0)));
    assert_eq!(instance1a.get_global_property("ExpGlo", "test"), Ok(Value::Number(88.0)));

    assert!(result.component("Settings").is_none());
    assert!(result.component("Foo").is_none());
    assert!(result.component("Common").is_none());
    assert!(result.component("ExpGlo").is_none());
    assert!(result.component("xyz").is_none());
}

#[cfg(all(test, feature = "internal-highlight"))]
fn compile(code: &str) -> (ComponentInstance, PathBuf) {
    i_slint_backend_testing::init_no_event_loop();
    let mut compiler = Compiler::default();
    compiler.set_style("fluent".into());
    let path = PathBuf::from("/tmp/test.slint");

    let compile_result =
        spin_on::spin_on(compiler.build_from_source(code.to_string(), path.clone()));

    for d in &compile_result.diagnostics {
        eprintln!("{d}");
    }

    assert!(!compile_result.has_errors());

    let definition = compile_result.components().next().unwrap();
    let instance = definition.create().unwrap();

    (instance, path)
}

#[cfg(feature = "internal-highlight")]
#[test]
fn test_element_node_at_source_code_position() {
    let code = r#"
component Bar1 {}

component Foo1 {
}

export component Foo2 inherits Window  {
    Bar1 {}
    Foo1   {}
}"#;

    let (handle, path) = compile(code);

    for i in 0..code.len() as u32 {
        let elements = handle.element_node_at_source_code_position(&path, i);
        eprintln!("{i}: {}", code.as_bytes()[i as usize] as char);
        match i {
            16 => assert_eq!(elements.len(), 1),       // Bar1 (def)
            35 => assert_eq!(elements.len(), 1),       // Foo1 (def)
            71..=78 => assert_eq!(elements.len(), 1),  // Window + WS (from Foo2)
            85..=89 => assert_eq!(elements.len(), 1),  // Bar1 + WS (use)
            97..=103 => assert_eq!(elements.len(), 1), // Foo1 + WS (use)
            _ => assert!(elements.is_empty()),
        }
    }
}

#[cfg(feature = "ffi")]
#[allow(missing_docs)]
#[path = "ffi.rs"]
pub(crate) mod ffi;