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slint/internal/compiler/generator/cpp.rs
Olivier Goffart dcd8450dfa WIP: start working on translations: @tr() 
This commit just do the parsing of the @tr macro.
2023-06-05 16:34:59 +02:00

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// Copyright © SixtyFPS GmbH <info@slint-ui.com>
// SPDX-License-Identifier: GPL-3.0-only OR LicenseRef-Slint-commercial
/*! module for the C++ code generator
*/
// cSpell:ignore cmath constexpr cstdlib decltype intptr itertools nullptr prepended struc subcomponent uintptr vals
use std::fmt::Write;
fn ident(ident: &str) -> String {
if ident.contains('-') {
ident.replace('-', "_")
} else {
ident.into()
}
}
/// Given a property reference to a native item (eg, the property name is empty)
/// return tokens to the `ItemRc`
fn access_item_rc(pr: &llr::PropertyReference, ctx: &EvaluationContext) -> String {
let mut ctx = ctx;
let mut component_access = "self".into();
let pr = match pr {
llr::PropertyReference::InParent { level, parent_reference } => {
for _ in 0..level.get() {
component_access = format!("{}->parent", component_access);
ctx = ctx.parent.as_ref().unwrap().ctx;
}
parent_reference
}
other => other,
};
match pr {
llr::PropertyReference::InNativeItem { sub_component_path, item_index, prop_name } => {
assert!(prop_name.is_empty());
let (sub_compo_path, sub_component) =
follow_sub_component_path(ctx.current_sub_component.unwrap(), sub_component_path);
if !sub_component_path.is_empty() {
component_access = format!("{}->{}", &component_access, &sub_compo_path);
}
let component_rc = format!("{}->self_weak.lock()->into_dyn()", &component_access);
let item_index_in_tree = sub_component.items[*item_index].index_in_tree;
let item_index = if item_index_in_tree == 0 {
format!("{}->tree_index", &component_access)
} else {
format!(
"{}->tree_index_of_first_child + {} - 1",
&component_access, item_index_in_tree
)
};
format!("{}, {}", &component_rc, item_index)
}
_ => unreachable!(),
}
}
/// This module contains some data structure that helps represent a C++ code.
/// It is then rendered into an actual C++ text using the Display trait
mod cpp_ast {
use std::cell::Cell;
use std::fmt::{Display, Error, Formatter};
thread_local!(static INDENTATION : Cell<u32> = Cell::new(0));
fn indent(f: &mut Formatter<'_>) -> Result<(), Error> {
INDENTATION.with(|i| {
for _ in 0..(i.get()) {
write!(f, " ")?;
}
Ok(())
})
}
///A full C++ file
#[derive(Default, Debug)]
pub struct File {
pub includes: Vec<String>,
pub declarations: Vec<Declaration>,
pub definitions: Vec<Declaration>,
}
impl Display for File {
fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error> {
for i in &self.includes {
writeln!(f, "#include {}", i)?;
}
for d in &self.declarations {
write!(f, "\n{}", d)?;
}
for d in &self.definitions {
write!(f, "\n{}", d)?;
}
Ok(())
}
}
/// Declarations (top level, or within a struct)
#[derive(Debug, derive_more::Display)]
pub enum Declaration {
Struct(Struct),
Function(Function),
Var(Var),
TypeAlias(TypeAlias),
}
#[derive(Debug, Copy, Clone, Eq, PartialEq)]
pub enum Access {
Public,
Private,
/*Protected,*/
}
#[derive(Default, Debug)]
pub struct Struct {
pub name: String,
pub members: Vec<(Access, Declaration)>,
pub friends: Vec<String>,
}
impl Display for Struct {
fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error> {
indent(f)?;
if self.members.is_empty() && self.friends.is_empty() {
writeln!(f, "class {};", self.name)
} else {
writeln!(f, "class {} {{", self.name)?;
INDENTATION.with(|x| x.set(x.get() + 1));
let mut access = Access::Private;
for m in &self.members {
if m.0 != access {
access = m.0;
indent(f)?;
match access {
Access::Public => writeln!(f, "public:")?,
Access::Private => writeln!(f, "private:")?,
}
}
write!(f, "{}", m.1)?;
}
for friend in &self.friends {
indent(f)?;
writeln!(f, "friend class {};", friend)?;
}
INDENTATION.with(|x| x.set(x.get() - 1));
indent(f)?;
writeln!(f, "}};")
}
}
}
impl Struct {
pub fn extract_definitions(&mut self) -> impl Iterator<Item = Declaration> + '_ {
let struct_name = self.name.clone();
self.members.iter_mut().filter_map(move |x| match &mut x.1 {
Declaration::Function(f) if f.statements.is_some() => {
Some(Declaration::Function(Function {
name: format!("{}::{}", struct_name, f.name),
signature: f.signature.clone(),
is_constructor_or_destructor: f.is_constructor_or_destructor,
is_static: false,
is_friend: false,
statements: f.statements.take(),
template_parameters: f.template_parameters.clone(),
constructor_member_initializers: f.constructor_member_initializers.clone(),
}))
}
_ => None,
})
}
}
/// Function or method
#[derive(Default, Debug)]
pub struct Function {
pub name: String,
/// "(...) -> ..."
pub signature: String,
/// The function does not have return type
pub is_constructor_or_destructor: bool,
pub is_static: bool,
pub is_friend: bool,
/// The list of statement instead the function. When None, this is just a function
/// declaration without the definition
pub statements: Option<Vec<String>>,
/// What's inside template<...> if any
pub template_parameters: Option<String>,
/// Explicit initializers, such as FooClass::FooClass() : someMember(42) {}
pub constructor_member_initializers: Vec<String>,
}
impl Display for Function {
fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error> {
indent(f)?;
if let Some(tpl) = &self.template_parameters {
write!(f, "template<{}> ", tpl)?;
}
if self.is_static {
write!(f, "static ")?;
}
if self.is_friend {
write!(f, "friend ")?;
}
// all functions are `inline` because we are in a header
write!(f, "inline ")?;
if !self.is_constructor_or_destructor {
write!(f, "auto ")?;
}
write!(f, "{} {}", self.name, self.signature)?;
if let Some(st) = &self.statements {
if !self.constructor_member_initializers.is_empty() {
writeln!(f, "\n : {}", self.constructor_member_initializers.join(","))?;
}
writeln!(f, "{{")?;
for s in st {
indent(f)?;
writeln!(f, " {}", s)?;
}
indent(f)?;
writeln!(f, "}}")
} else {
writeln!(f, ";")
}
}
}
/// A variable or a member declaration.
#[derive(Default, Debug)]
pub struct Var {
pub ty: String,
pub name: String,
pub array_size: Option<usize>,
pub init: Option<String>,
}
impl Display for Var {
fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error> {
indent(f)?;
write!(f, "{} {}", self.ty, self.name)?;
if let Some(size) = self.array_size {
write!(f, "[{}]", size)?;
}
if let Some(i) = &self.init {
write!(f, " = {}", i)?;
}
writeln!(f, ";")
}
}
#[derive(Default, Debug)]
pub struct TypeAlias {
pub new_name: String,
pub old_name: String,
}
impl Display for TypeAlias {
fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
indent(f)?;
writeln!(f, "using {} = {};", self.new_name, self.old_name)
}
}
pub trait CppType {
fn cpp_type(&self) -> Option<String>;
}
pub fn escape_string(str: &str) -> String {
let mut result = String::with_capacity(str.len());
for x in str.chars() {
match x {
'\n' => result.push_str("\\n"),
'\\' => result.push_str("\\\\"),
'\"' => result.push_str("\\\""),
'\t' => result.push_str("\\t"),
'\r' => result.push_str("\\r"),
_ if !x.is_ascii() || (x as u32) < 32 => {
use std::fmt::Write;
write!(result, "\\U{:0>8x}", x as u32).unwrap();
}
_ => result.push(x),
}
}
result
}
}
use crate::expression_tree::{BuiltinFunction, EasingCurve};
use crate::langtype::{ElementType, NativeClass, Type};
use crate::layout::Orientation;
use crate::llr::{
self, EvaluationContext as llr_EvaluationContext, ParentCtx as llr_ParentCtx,
TypeResolutionContext as _,
};
use crate::object_tree::Document;
use crate::parser::syntax_nodes;
use cpp_ast::*;
use itertools::{Either, Itertools};
use std::collections::BTreeMap;
use std::num::NonZeroUsize;
type EvaluationContext<'a> = llr_EvaluationContext<'a, String>;
type ParentCtx<'a> = llr_ParentCtx<'a, String>;
impl CppType for Type {
fn cpp_type(&self) -> Option<String> {
match self {
Type::Void => Some("void".to_owned()),
Type::Float32 => Some("float".to_owned()),
Type::Int32 => Some("int".to_owned()),
Type::String => Some("slint::SharedString".to_owned()),
Type::Color => Some("slint::Color".to_owned()),
Type::Duration => Some("std::int64_t".to_owned()),
Type::Angle => Some("float".to_owned()),
Type::PhysicalLength => Some("float".to_owned()),
Type::LogicalLength => Some("float".to_owned()),
Type::Rem => Some("float".to_owned()),
Type::Percent => Some("float".to_owned()),
Type::Bool => Some("bool".to_owned()),
Type::Struct { name: Some(name), node: Some(_), .. } => Some(ident(name)),
Type::Struct { name: Some(name), node: None, .. } => {
Some(if name.starts_with("slint::") {
name.clone()
} else {
format!("slint::cbindgen_private::{}", ident(name))
})
}
Type::Struct { fields, .. } => {
let elem = fields.values().map(|v| v.cpp_type()).collect::<Option<Vec<_>>>()?;
Some(format!("std::tuple<{}>", elem.join(", ")))
}
Type::Array(i) => Some(format!("std::shared_ptr<slint::Model<{}>>", i.cpp_type()?)),
Type::Image => Some("slint::Image".to_owned()),
Type::Enumeration(enumeration) => {
Some(format!("slint::cbindgen_private::{}", ident(&enumeration.name)))
}
Type::Brush => Some("slint::Brush".to_owned()),
Type::LayoutCache => Some("slint::SharedVector<float>".into()),
_ => None,
}
}
}
fn to_cpp_orientation(o: Orientation) -> &'static str {
match o {
Orientation::Horizontal => "slint::cbindgen_private::Orientation::Horizontal",
Orientation::Vertical => "slint::cbindgen_private::Orientation::Vertical",
}
}
/// If the expression is surrounded with parentheses, remove these parentheses
fn remove_parentheses(expr: &str) -> &str {
if expr.starts_with('(') && expr.ends_with(')') {
let mut level = 0;
// check that the opening and closing parentheses are on the same level
for byte in expr[1..expr.len() - 1].as_bytes() {
match byte {
b')' if level == 0 => return expr,
b')' => level -= 1,
b'(' => level += 1,
_ => (),
}
}
&expr[1..expr.len() - 1]
} else {
expr
}
}
#[test]
fn remove_parentheses_test() {
assert_eq!(remove_parentheses("(foo(bar))"), "foo(bar)");
assert_eq!(remove_parentheses("(foo).bar"), "(foo).bar");
assert_eq!(remove_parentheses("(foo(bar))"), "foo(bar)");
assert_eq!(remove_parentheses("(foo)(bar)"), "(foo)(bar)");
assert_eq!(remove_parentheses("(foo).get()"), "(foo).get()");
assert_eq!(remove_parentheses("((foo).get())"), "(foo).get()");
assert_eq!(remove_parentheses("(((()())()))"), "((()())())");
assert_eq!(remove_parentheses("((()())())"), "(()())()");
assert_eq!(remove_parentheses("(()())()"), "(()())()");
assert_eq!(remove_parentheses("()())("), "()())(");
}
fn property_set_value_code(
property: &llr::PropertyReference,
value_expr: &str,
ctx: &EvaluationContext,
) -> String {
let prop = access_member(property, ctx);
if let Some(animation) = ctx.current_sub_component.and_then(|c| c.animations.get(property)) {
let animation_code = compile_expression(animation, ctx);
return format!("{}.set_animated_value({}, {})", prop, value_expr, animation_code);
}
format!("{}.set({})", prop, value_expr)
}
fn handle_property_init(
prop: &llr::PropertyReference,
binding_expression: &llr::BindingExpression,
init: &mut Vec<String>,
ctx: &EvaluationContext,
) {
let prop_access = access_member(prop, ctx);
let prop_type = ctx.property_ty(prop);
if let Type::Callback { args, .. } = &prop_type {
let mut ctx2 = ctx.clone();
ctx2.argument_types = args;
let mut params = args.iter().enumerate().map(|(i, ty)| {
format!("[[maybe_unused]] {} arg_{}", ty.cpp_type().unwrap_or_default(), i)
});
init.push(format!(
"{prop_access}.set_handler(
[this]({params}) {{
[[maybe_unused]] auto self = this;
return {code};
}});",
prop_access = prop_access,
params = params.join(", "),
code = compile_expression_wrap_return(&binding_expression.expression.borrow(), &ctx2)
));
} else {
let init_expr =
compile_expression_wrap_return(&binding_expression.expression.borrow(), ctx);
init.push(if binding_expression.is_constant && !binding_expression.is_state_info {
format!("{}.set({});", prop_access, init_expr)
} else {
let binding_code = format!(
"[this]() {{
[[maybe_unused]] auto self = this;
return {init};
}}",
init = init_expr
);
if binding_expression.is_state_info {
format!("slint::private_api::set_state_binding({}, {});", prop_access, binding_code)
} else {
match &binding_expression.animation {
Some(llr::Animation::Static(anim)) => {
let anim = compile_expression(anim, ctx);
format!("{}.set_animated_binding({}, {});", prop_access, binding_code, anim)
}
Some(llr::Animation::Transition (
anim
)) => {
let anim = compile_expression(anim, ctx);
format!(
"{}.set_animated_binding_for_transition({},
[this](uint64_t *start_time) -> slint::cbindgen_private::PropertyAnimation {{
[[maybe_unused]] auto self = this;
auto [anim, time] = {};
*start_time = time;
return anim;
}});",
prop_access,
binding_code,
anim,
)
}
None => format!("{}.set_binding({});", prop_access, binding_code),
}
}
});
}
}
/// Returns the text of the C++ code produced by the given root component
pub fn generate(doc: &Document) -> impl std::fmt::Display {
let mut file = File::default();
file.includes.push("<array>".into());
file.includes.push("<limits>".into());
file.includes.push("<cstdlib>".into()); // TODO: ideally only include this if needed (by to_float)
file.includes.push("<cmath>".into()); // TODO: ideally only include this if needed (by floor/ceil/round)
file.includes.push("<slint.h>".into());
for (path, er) in doc.root_component.embedded_file_resources.borrow().iter() {
match &er.kind {
crate::embedded_resources::EmbeddedResourcesKind::RawData => {
let resource_file =
crate::fileaccess::load_file(std::path::Path::new(path)).unwrap(); // embedding pass ensured that the file exists
let data = resource_file.read();
let mut init = "{ ".to_string();
for (index, byte) in data.iter().enumerate() {
if index > 0 {
init.push(',');
}
write!(&mut init, "0x{:x}", byte).unwrap();
if index % 16 == 0 {
init.push('\n');
}
}
init.push('}');
file.declarations.push(Declaration::Var(Var {
ty: "const inline uint8_t".into(),
name: format!("slint_embedded_resource_{}", er.id),
array_size: Some(data.len()),
init: Some(init),
}));
}
#[cfg(feature = "software-renderer")]
crate::embedded_resources::EmbeddedResourcesKind::TextureData(
crate::embedded_resources::Texture {
data,
format,
rect,
total_size: crate::embedded_resources::Size { width, height },
original_size:
crate::embedded_resources::Size {
width: unscaled_width,
height: unscaled_height,
},
},
) => {
let (r_x, r_y, r_w, r_h) = (rect.x(), rect.y(), rect.width(), rect.height());
let color =
if let crate::embedded_resources::PixelFormat::AlphaMap([r, g, b]) = format {
format!("slint::Color::from_rgb_uint8({r}, {g}, {b})")
} else {
"slint::Color{}".to_string()
};
let count = data.len();
let data = data.iter().map(ToString::to_string).join(", ");
let data_name = format!("slint_embedded_resource_{}_data", er.id);
file.declarations.push(Declaration::Var(Var {
ty: "inline uint8_t".into(),
name: data_name.clone(),
array_size: Some(count),
init: Some(format!("{{ {data} }}")),
}));
let texture_name = format!("slint_embedded_resource_{}_texture", er.id);
file.declarations.push(Declaration::Var(Var {
ty: "inline slint::cbindgen_private::types::StaticTexture".into(),
name: texture_name.clone(),
array_size: None,
init: Some(format!(
"{{
.rect = {{ {r_x}, {r_y}, {r_w}, {r_h} }},
.format = slint::cbindgen_private::types::PixelFormat::{format},
.color = {color},
.index = 0,
}}"
)),
}));
let init = format!("slint::cbindgen_private::types::StaticTextures {{
.size = {{ {width}, {height} }},
.original_size = {{ {unscaled_width}, {unscaled_height} }},
.data = slint::cbindgen_private::Slice<uint8_t>{{ {data_name} , {count} }},
.textures = slint::cbindgen_private::Slice<slint::cbindgen_private::types::StaticTexture>{{ &{texture_name}, 1 }}
}}");
file.declarations.push(Declaration::Var(Var {
ty: "inline slint::cbindgen_private::types::StaticTextures".into(),
name: format!("slint_embedded_resource_{}", er.id),
array_size: None,
init: Some(init),
}))
}
#[cfg(feature = "software-renderer")]
crate::embedded_resources::EmbeddedResourcesKind::BitmapFontData(_) => {
// FIXME! TODO
file.declarations.push(Declaration::Var(Var {
ty: "inline int".into(),
name: format!("slint_embedded_resource_{}", er.id),
array_size: None,
init: Some("0".into()),
}))
}
}
}
for ty in doc.root_component.used_types.borrow().structs.iter() {
if let Type::Struct { fields, name: Some(name), node: Some(node), .. } = ty {
generate_struct(&mut file, name, fields, node);
}
}
if matches!(
doc.root_component.root_element.borrow().base_type,
ElementType::Error | ElementType::Global
) {
// empty document, nothing to generate
return file;
}
let llr = llr::lower_to_item_tree::lower_to_item_tree(&doc.root_component);
// Forward-declare the root so that sub-components can access singletons, the window, etc.
file.declarations.push(Declaration::Struct(Struct {
name: ident(&llr.item_tree.root.name),
..Default::default()
}));
for sub_compo in &llr.sub_components {
let sub_compo_id = ident(&sub_compo.name);
let mut sub_compo_struct = Struct { name: sub_compo_id.clone(), ..Default::default() };
generate_sub_component(
&mut sub_compo_struct,
sub_compo,
&llr,
None,
Access::Public,
&mut file,
);
file.definitions.extend(sub_compo_struct.extract_definitions().collect::<Vec<_>>());
file.declarations.push(Declaration::Struct(sub_compo_struct));
}
for glob in llr.globals.iter().filter(|glob| !glob.is_builtin) {
generate_global(&mut file, glob, &llr);
file.definitions.extend(glob.aliases.iter().map(|name| {
Declaration::TypeAlias(TypeAlias { old_name: ident(&glob.name), new_name: ident(name) })
}))
}
generate_public_component(&mut file, &llr);
file.definitions.push(Declaration::Var(Var{
ty: format!(
"[[maybe_unused]] constexpr slint::private_api::VersionCheckHelper<{}, {}, {}>",
env!("CARGO_PKG_VERSION_MAJOR"),
env!("CARGO_PKG_VERSION_MINOR"),
env!("CARGO_PKG_VERSION_PATCH")),
name: "THE_SAME_VERSION_MUST_BE_USED_FOR_THE_COMPILER_AND_THE_RUNTIME".into(),
init: Some("slint::private_api::VersionCheckHelper<SLINT_VERSION_MAJOR, SLINT_VERSION_MINOR, SLINT_VERSION_PATCH>()".into()),
..Default::default()
}));
file
}
fn generate_struct(
file: &mut File,
name: &str,
fields: &BTreeMap<String, Type>,
node: &syntax_nodes::ObjectType,
) {
let mut members = node
.ObjectTypeMember()
.map(|n| crate::parser::identifier_text(&n).unwrap())
.map(|name| {
(
Access::Public,
Declaration::Var(Var {
ty: fields.get(&name).unwrap().cpp_type().unwrap(),
name: ident(&name),
..Default::default()
}),
)
})
.collect::<Vec<_>>();
members.push((
Access::Public,
Declaration::Function(Function {
name: "operator==".to_owned(),
signature: format!("(const class {0} &a, const class {0} &b) -> bool = default", name),
is_friend: true,
statements: None,
..Function::default()
}),
));
file.declarations.push(Declaration::Struct(Struct {
name: name.into(),
members,
..Default::default()
}))
}
/// Generate the component in `file`.
///
/// `sub_components`, if Some, will be filled with all the sub component which needs to be added as friends
fn generate_public_component(file: &mut File, component: &llr::PublicComponent) {
let root_component = &component.item_tree.root;
let component_id = ident(&root_component.name);
let mut component_struct = Struct { name: component_id.clone(), ..Default::default() };
// The window need to be the first member so it is destroyed last
component_struct.members.push((
// FIXME: many of the different component bindings need to access this
Access::Public,
Declaration::Var(Var {
ty: "slint::Window".into(),
name: "m_window".into(),
init: Some("slint::Window{slint::private_api::WindowAdapterRc()}".into()),
..Default::default()
}),
));
let ctx = EvaluationContext {
public_component: component,
current_sub_component: Some(&component.item_tree.root),
current_global: None,
generator_state: "this".to_string(),
parent: None,
argument_types: &[],
};
let old_declarations = file.declarations.len();
generate_item_tree(
&mut component_struct,
&component.item_tree,
component,
None,
component_id,
Access::Private, // Hide properties and other fields from the C++ API
file,
);
// Give generated sub-components, etc. access to our fields
for new_decl in file.declarations.iter().skip(old_declarations) {
if let Declaration::Struct(struc @ Struct { .. }) = new_decl {
component_struct.friends.push(struc.name.clone());
};
}
generate_public_api_for_properties(
&mut component_struct.members,
&component.public_properties,
&component.private_properties,
&ctx,
);
component_struct.members.push((
Access::Public,
Declaration::Function(Function {
name: "show".into(),
signature: "()".into(),
statements: Some(vec!["m_window.show();".into()]),
..Default::default()
}),
));
component_struct.members.push((
Access::Public,
Declaration::Function(Function {
name: "hide".into(),
signature: "()".into(),
statements: Some(vec!["m_window.hide();".into()]),
..Default::default()
}),
));
component_struct.members.push((
Access::Public,
Declaration::Function(Function {
name: "window".into(),
signature: "() const -> slint::Window&".into(),
statements: Some(vec![format!(
"return const_cast<{} *>(this)->m_window;",
component_struct.name
)]),
..Default::default()
}),
));
component_struct.members.push((
Access::Public,
Declaration::Function(Function {
name: "run".into(),
signature: "()".into(),
statements: Some(vec![
"show();".into(),
"slint::run_event_loop();".into(),
"hide();".into(),
]),
..Default::default()
}),
));
component_struct.friends.push("slint::private_api::WindowAdapterRc".into());
add_friends(&mut component_struct.friends, &component.item_tree.root, true);
for sc in &component.sub_components {
add_friends(&mut component_struct.friends, sc, false);
}
fn add_friends(friends: &mut Vec<String>, sc: &llr::SubComponent, is_root: bool) {
if !is_root {
friends.push(ident(&sc.name));
}
for repeater in &sc.repeated {
add_friends(friends, &repeater.sub_tree.root, false)
}
for popup in &sc.popup_windows {
add_friends(friends, &popup.root, false)
}
}
for glob in &component.globals {
let ty = if glob.is_builtin {
format!("slint::cbindgen_private::{}", glob.name)
} else {
let ty = ident(&glob.name);
component_struct.friends.push(ty.clone());
ty
};
component_struct.members.push((
Access::Private,
Declaration::Var(Var {
ty: format!("std::shared_ptr<{}>", ty),
name: format!("global_{}", ident(&glob.name)),
init: Some(format!("std::make_shared<{}>(this)", ty)),
..Default::default()
}),
));
}
let mut global_accessor_function_body = Vec::new();
for glob in component.globals.iter().filter(|glob| glob.exported && !glob.is_builtin) {
let accessor_statement = format!(
"{0}if constexpr(std::is_same_v<T, {1}>) {{ return *global_{1}.get(); }}",
if global_accessor_function_body.is_empty() { "" } else { "else " },
ident(&glob.name),
);
global_accessor_function_body.push(accessor_statement);
}
if !global_accessor_function_body.is_empty() {
global_accessor_function_body.push(
"else { static_assert(!sizeof(T*), \"The type is not global/or exported\"); }".into(),
);
component_struct.members.push((
Access::Public,
Declaration::Function(Function {
name: "global".into(),
signature: "() const -> const T&".into(),
statements: Some(global_accessor_function_body),
template_parameters: Some("typename T".into()),
..Default::default()
}),
));
}
file.definitions.extend(component_struct.extract_definitions().collect::<Vec<_>>());
file.declarations.push(Declaration::Struct(component_struct));
}
fn generate_item_tree(
target_struct: &mut Struct,
sub_tree: &llr::ItemTree,
root: &llr::PublicComponent,
parent_ctx: Option<ParentCtx>,
item_tree_class_name: String,
field_access: Access,
file: &mut File,
) {
target_struct.friends.push(format!(
"vtable::VRc<slint::private_api::ComponentVTable, {}>",
item_tree_class_name
));
generate_sub_component(
target_struct,
&sub_tree.root,
root,
parent_ctx.clone(),
field_access,
file,
);
let root_access = if parent_ctx.is_some() { "parent->root" } else { "self" };
let mut item_tree_array: Vec<String> = Default::default();
let mut item_array: Vec<String> = Default::default();
sub_tree.tree.visit_in_array(&mut |node, children_offset, parent_index| {
let parent_index = parent_index as u32;
if node.repeated {
assert_eq!(node.children.len(), 0);
let mut repeater_index = node.item_index;
let mut sub_component = &sub_tree.root;
for i in &node.sub_component_path {
repeater_index += sub_component.sub_components[*i].repeater_offset;
sub_component = &sub_component.sub_components[*i].ty;
}
item_tree_array.push(format!(
"slint::private_api::make_dyn_node({}, {})",
repeater_index, parent_index
));
} else {
let mut compo_offset = String::new();
let mut sub_component = &sub_tree.root;
for i in &node.sub_component_path {
let next_sub_component_name = ident(&sub_component.sub_components[*i].name);
write!(
compo_offset,
"offsetof({}, {}) + ",
ident(&sub_component.name),
next_sub_component_name
)
.unwrap();
sub_component = &sub_component.sub_components[*i].ty;
}
let item = &sub_component.items[node.item_index];
if item.is_flickable_viewport {
compo_offset += "offsetof(slint::cbindgen_private::Flickable, viewport) + ";
}
let children_count = node.children.len() as u32;
let children_index = children_offset as u32;
let item_array_index = item_array.len() as u32;
item_tree_array.push(format!(
"slint::private_api::make_item_node({}, {}, {}, {}, {})",
children_count, children_index, parent_index, item_array_index, node.is_accessible
));
item_array.push(format!(
"{{ {}, {} offsetof({}, {}) }}",
item.ty.cpp_vtable_getter,
compo_offset,
&ident(&sub_component.name),
ident(&item.name),
));
}
});
let mut visit_children_statements = vec![
"static const auto dyn_visit = [] (const uint8_t *base, [[maybe_unused]] slint::private_api::TraversalOrder order, [[maybe_unused]] slint::private_api::ItemVisitorRefMut visitor, [[maybe_unused]] uintptr_t dyn_index) -> uint64_t {".to_owned(),
format!(" [[maybe_unused]] auto self = reinterpret_cast<const {}*>(base);", item_tree_class_name)];
let mut subtree_range_statement = vec![" std::abort();".into()];
let mut subtree_component_statement = vec![" std::abort();".into()];
if target_struct.members.iter().any(|(_, declaration)| {
matches!(&declaration, Declaration::Function(func @ Function { .. }) if func.name == "visit_dynamic_children")
}) {
visit_children_statements
.push(" return self->visit_dynamic_children(dyn_index, order, visitor);".into());
subtree_range_statement = vec![
format!("auto self = reinterpret_cast<const {}*>(component.instance);", item_tree_class_name),
"return self->subtree_range(dyn_index);".to_owned(),
];
subtree_component_statement = vec![
format!("auto self = reinterpret_cast<const {}*>(component.instance);", item_tree_class_name),
"self->subtree_component(dyn_index, subtree_index, result);".to_owned(),
];
} else {
visit_children_statements.push(" std::abort();".into());
}
visit_children_statements.extend([
"};".into(),
format!("auto self_rc = reinterpret_cast<const {}*>(component.instance)->self_weak.lock()->into_dyn();", item_tree_class_name),
"return slint::cbindgen_private::slint_visit_item_tree(&self_rc, get_item_tree(component) , index, order, visitor, dyn_visit);".to_owned(),
]);
target_struct.members.push((
Access::Private,
Declaration::Function(Function {
name: "visit_children".into(),
signature: "(slint::private_api::ComponentRef component, intptr_t index, slint::private_api::TraversalOrder order, slint::private_api::ItemVisitorRefMut visitor) -> uint64_t".into(),
is_static: true,
statements: Some(visit_children_statements),
..Default::default()
}),
));
target_struct.members.push((
Access::Private,
Declaration::Function(Function {
name: "get_item_ref".into(),
signature: "(slint::private_api::ComponentRef component, uintptr_t index) -> slint::private_api::ItemRef".into(),
is_static: true,
statements: Some(vec![
"return slint::private_api::get_item_ref(component, get_item_tree(component), item_array(), index);".to_owned(),
]),
..Default::default()
}),
));
target_struct.members.push((
Access::Private,
Declaration::Function(Function {
name: "get_subtree_range".into(),
signature: "([[maybe_unused]] slint::private_api::ComponentRef component, [[maybe_unused]] uintptr_t dyn_index) -> slint::private_api::IndexRange".into(),
is_static: true,
statements: Some(subtree_range_statement),
..Default::default()
}),
));
target_struct.members.push((
Access::Private,
Declaration::Function(Function {
name: "get_subtree_component".into(),
signature: "([[maybe_unused]] slint::private_api::ComponentRef component, [[maybe_unused]] uintptr_t dyn_index, [[maybe_unused]] uintptr_t subtree_index, [[maybe_unused]] slint::private_api::ComponentWeak *result) -> void".into(),
is_static: true,
statements: Some(subtree_component_statement),
..Default::default()
}),
));
target_struct.members.push((
Access::Private,
Declaration::Function(Function {
name: "get_item_tree".into(),
signature: "(slint::private_api::ComponentRef) -> slint::cbindgen_private::Slice<slint::private_api::ItemTreeNode>".into(),
is_static: true,
statements: Some(vec![
"return item_tree();".to_owned(),
]),
..Default::default()
}),
));
let parent_item_from_parent_component = parent_ctx.as_ref()
.and_then(|parent| {
parent
.repeater_index
.map(|idx| parent.ctx.current_sub_component.unwrap().repeated[idx].index_in_tree)
}).map(|parent_index|
vec![
format!(
"auto self = reinterpret_cast<const {}*>(component.instance);",
item_tree_class_name,
),
format!(
"*result = {{ self->parent->self_weak, self->parent->tree_index_of_first_child + {} - 1 }};",
parent_index,
)
])
.unwrap_or_default();
target_struct.members.push((
Access::Private,
Declaration::Function(Function {
name: "parent_node".into(),
signature: "([[maybe_unused]] slint::private_api::ComponentRef component, [[maybe_unused]] slint::private_api::ItemWeak *result) -> void".into(),
is_static: true,
statements: Some(parent_item_from_parent_component,),
..Default::default()
}),
));
// Statements will be overridden for repeated components!
target_struct.members.push((
Access::Private,
Declaration::Function(Function {
name: "subtree_index".into(),
signature: "([[maybe_unused]] slint::private_api::ComponentRef component) -> uintptr_t"
.into(),
is_static: true,
statements: Some(vec!["return std::numeric_limits<uintptr_t>::max();".into()]),
..Default::default()
}),
));
target_struct.members.push((
Access::Private,
Declaration::Function(Function {
name: "item_tree".into(),
signature: "() -> slint::cbindgen_private::Slice<slint::private_api::ItemTreeNode>".into(),
is_static: true,
statements: Some(vec![
"static const slint::private_api::ItemTreeNode children[] {".to_owned(),
format!(" {} }};", item_tree_array.join(", \n")),
"return { const_cast<slint::private_api::ItemTreeNode*>(children), std::size(children) };"
.to_owned(),
]),
..Default::default()
}),
));
target_struct.members.push((
Access::Private,
Declaration::Function(Function {
name: "item_array".into(),
signature: "() -> const slint::private_api::ItemArray".into(),
is_static: true,
statements: Some(vec![
"static const slint::private_api::ItemArrayEntry items[] {".to_owned(),
format!(" {} }};", item_array.join(", \n")),
"return { const_cast<slint::private_api::ItemArrayEntry*>(items), std::size(items) };"
.to_owned(),
]),
..Default::default()
}),
));
target_struct.members.push((
Access::Private,
Declaration::Function(Function {
name: "layout_info".into(),
signature:
"([[maybe_unused]] slint::private_api::ComponentRef component, slint::cbindgen_private::Orientation o) -> slint::cbindgen_private::LayoutInfo"
.into(),
is_static: true,
statements: Some(vec![format!(
"return reinterpret_cast<const {}*>(component.instance)->layout_info(o);",
item_tree_class_name
)]),
..Default::default()
}),
));
target_struct.members.push((
Access::Private,
Declaration::Function(Function {
name: "accessible_role".into(),
signature:
"([[maybe_unused]] slint::private_api::ComponentRef component, uintptr_t index) -> slint::cbindgen_private::AccessibleRole"
.into(),
is_static: true,
statements: Some(vec![format!(
"return reinterpret_cast<const {}*>(component.instance)->accessible_role(index);",
item_tree_class_name
)]),
..Default::default()
}),
));
target_struct.members.push((
Access::Private,
Declaration::Function(Function {
name: "accessible_string_property".into(),
signature:
"([[maybe_unused]] slint::private_api::ComponentRef component, uintptr_t index, slint::cbindgen_private::AccessibleStringProperty what, slint::SharedString *result) -> void"
.into(),
is_static: true,
statements: Some(vec![format!(
"*result = reinterpret_cast<const {}*>(component.instance)->accessible_string_property(index, what);",
item_tree_class_name
)]),
..Default::default()
}),
));
target_struct.members.push((
Access::Public,
Declaration::Var(Var {
ty: "static const slint::private_api::ComponentVTable".to_owned(),
name: "static_vtable".to_owned(),
..Default::default()
}),
));
file.definitions.push(Declaration::Var(Var {
ty: "inline const slint::private_api::ComponentVTable".to_owned(),
name: format!("{}::static_vtable", item_tree_class_name),
init: Some(format!(
"{{ visit_children, get_item_ref, get_subtree_range, get_subtree_component, \
get_item_tree, parent_node, subtree_index, layout_info, \
accessible_role, accessible_string_property, \
slint::private_api::drop_in_place<{}>, slint::private_api::dealloc }}",
item_tree_class_name
)),
..Default::default()
}));
let mut create_parameters = Vec::new();
let mut init_parent_parameters = "";
if let Some(parent) = &parent_ctx {
let parent_type =
format!("class {} const *", ident(&parent.ctx.current_sub_component.unwrap().name));
create_parameters.push(format!("{} parent", parent_type));
init_parent_parameters = ", parent";
}
let mut create_code = vec![
format!(
"auto self_rc = vtable::VRc<slint::private_api::ComponentVTable, {0}>::make();",
target_struct.name
),
format!("auto self = const_cast<{0} *>(&*self_rc);", target_struct.name),
"self->self_weak = vtable::VWeak(self_rc).into_dyn();".into(),
];
if parent_ctx.is_none() {
create_code.extend([format!(
"{}->m_window.window_handle().set_component(*self_rc);",
root_access
)]);
}
create_code.extend([
format!(
"{}->m_window.window_handle().register_component(self, self->item_array());",
root_access
),
format!("self->init({}, self->self_weak, 0, 1 {});", root_access, init_parent_parameters),
]);
// Repeaters run their user_init() code from Repeater::ensure_updated() after update() initialized model_data/index.
// So always call user_init(), unless this component is a repeated.
if parent_ctx.map_or(true, |parent_ctx| parent_ctx.repeater_index.is_none()) {
create_code.push(format!("self->user_init();"));
}
create_code
.push(format!("return slint::ComponentHandle<{0}>{{ self_rc }};", target_struct.name));
target_struct.members.push((
Access::Public,
Declaration::Function(Function {
name: "create".into(),
signature: format!(
"({}) -> slint::ComponentHandle<{}>",
create_parameters.join(","),
target_struct.name
),
statements: Some(create_code),
is_static: true,
..Default::default()
}),
));
let mut destructor = vec!["auto self = this;".to_owned()];
destructor.push(format!(
"{}->m_window.window_handle().unregister_component(self, item_array());",
root_access
));
target_struct.members.push((
Access::Public,
Declaration::Function(Function {
name: format!("~{}", target_struct.name),
signature: "()".to_owned(),
is_constructor_or_destructor: true,
statements: Some(destructor),
..Default::default()
}),
));
}
fn generate_sub_component(
target_struct: &mut Struct,
component: &llr::SubComponent,
root: &llr::PublicComponent,
parent_ctx: Option<ParentCtx>,
field_access: Access,
file: &mut File,
) {
let root_ptr_type = format!("const {} *", ident(&root.item_tree.root.name));
let mut init_parameters = vec![
format!("{} root", root_ptr_type),
"slint::cbindgen_private::ComponentWeak enclosing_component".into(),
"uintptr_t tree_index".into(),
"uintptr_t tree_index_of_first_child".into(),
];
let mut init: Vec<String> =
vec!["auto self = this;".into(), "self->self_weak = enclosing_component;".into()];
target_struct.members.push((
Access::Public,
Declaration::Var(Var {
ty: "slint::cbindgen_private::ComponentWeak".into(),
name: "self_weak".into(),
..Default::default()
}),
));
target_struct.members.push((
field_access,
Declaration::Var(Var { ty: root_ptr_type, name: "root".to_owned(), ..Default::default() }),
));
init.push("self->root = root;".into());
target_struct.members.push((
field_access,
Declaration::Var(Var {
ty: "uintptr_t".to_owned(),
name: "tree_index_of_first_child".to_owned(),
..Default::default()
}),
));
init.push("this->tree_index_of_first_child = tree_index_of_first_child;".into());
target_struct.members.push((
field_access,
Declaration::Var(Var {
ty: "uintptr_t".to_owned(),
name: "tree_index".to_owned(),
..Default::default()
}),
));
init.push("self->tree_index = tree_index;".into());
if let Some(parent_ctx) = &parent_ctx {
let parent_type =
format!("class {} const *", ident(&parent_ctx.ctx.current_sub_component.unwrap().name));
init_parameters.push(format!("{} parent", parent_type));
target_struct.members.push((
field_access,
Declaration::Var(Var {
ty: parent_type,
name: "parent".to_owned(),
..Default::default()
}),
));
init.push("self->parent = parent;".into());
}
let ctx = EvaluationContext::new_sub_component(
root,
component,
"self->root".into(),
parent_ctx.clone(),
);
component.popup_windows.iter().for_each(|c| {
let component_id = ident(&c.root.name);
let mut popup_struct = Struct { name: component_id.clone(), ..Default::default() };
generate_item_tree(
&mut popup_struct,
c,
root,
Some(ParentCtx::new(&ctx, None)),
component_id,
Access::Public,
file,
);
file.definitions.extend(popup_struct.extract_definitions().collect::<Vec<_>>());
file.declarations.push(Declaration::Struct(popup_struct));
});
for property in component.properties.iter().filter(|p| p.use_count.get() > 0) {
let cpp_name = ident(&property.name);
let ty = if let Type::Callback { args, return_type } = &property.ty {
let param_types = args.iter().map(|t| t.cpp_type().unwrap()).collect::<Vec<_>>();
let return_type =
return_type.as_ref().map_or("void".to_owned(), |t| t.cpp_type().unwrap());
format!("slint::private_api::Callback<{}({})>", return_type, param_types.join(", "))
} else {
format!("slint::private_api::Property<{}>", property.ty.cpp_type().unwrap())
};
target_struct.members.push((
field_access,
Declaration::Var(Var { ty, name: cpp_name, ..Default::default() }),
));
}
let mut user_init = vec!["[[maybe_unused]] auto self = this;".into()];
let mut children_visitor_cases = Vec::new();
let mut subtrees_ranges_cases = Vec::new();
let mut subtrees_components_cases = Vec::new();
for sub in &component.sub_components {
let field_name = ident(&sub.name);
let local_tree_index: u32 = sub.index_in_tree as _;
let local_index_of_first_child: u32 = sub.index_of_first_child_in_tree as _;
// For children of sub-components, the item index generated by the generate_item_indices pass
// starts at 1 (0 is the root element).
let global_index = if local_tree_index == 0 {
"tree_index".into()
} else {
format!("tree_index_of_first_child + {} - 1", local_tree_index)
};
let global_children = if local_index_of_first_child == 0 {
"0".into()
} else {
format!("tree_index_of_first_child + {} - 1", local_index_of_first_child)
};
init.push(format!(
"this->{}.init(root, self_weak.into_dyn(), {}, {});",
field_name, global_index, global_children
));
user_init.push(format!("this->{}.user_init();", field_name));
let sub_component_repeater_count = sub.ty.repeater_count();
if sub_component_repeater_count > 0 {
let mut case_code = String::new();
let repeater_offset = sub.repeater_offset;
for local_repeater_index in 0..sub_component_repeater_count {
write!(case_code, "case {}: ", repeater_offset + local_repeater_index).unwrap();
}
children_visitor_cases.push(format!(
"\n {case_code} {{
return self->{id}.visit_dynamic_children(dyn_index - {base}, order, visitor);
}}",
case_code = case_code,
id = field_name,
base = repeater_offset,
));
subtrees_ranges_cases.push(format!(
"\n {case_code} {{
return self->{id}.subtree_range(dyn_index - {base});
}}",
case_code = case_code,
id = field_name,
base = repeater_offset,
));
subtrees_components_cases.push(format!(
"\n {case_code} {{
self->{id}.subtree_component(dyn_index - {base}, subtree_index, result);
return;
}}",
case_code = case_code,
id = field_name,
base = repeater_offset,
));
}
target_struct.members.push((
field_access,
Declaration::Var(Var {
ty: ident(&sub.ty.name),
name: field_name,
..Default::default()
}),
));
}
for (prop1, prop2) in &component.two_way_bindings {
init.push(format!(
"slint::private_api::Property<{ty}>::link_two_way(&{p1}, &{p2});",
ty = ctx.property_ty(prop1).cpp_type().unwrap(),
p1 = access_member(prop1, &ctx),
p2 = access_member(prop2, &ctx),
));
}
let mut properties_init_code = Vec::new();
for (prop, expression) in &component.property_init {
if expression.use_count.get() > 0 {
handle_property_init(prop, expression, &mut properties_init_code, &ctx)
}
}
for item in &component.items {
if item.is_flickable_viewport {
continue;
}
target_struct.members.push((
field_access,
Declaration::Var(Var {
ty: format!("slint::cbindgen_private::{}", ident(&item.ty.class_name)),
name: ident(&item.name),
init: Some("{}".to_owned()),
..Default::default()
}),
));
}
for (idx, repeated) in component.repeated.iter().enumerate() {
let data_type = if let Some(data_prop) = repeated.data_prop {
repeated.sub_tree.root.properties[data_prop].ty.clone()
} else {
Type::Int32
};
generate_repeated_component(
repeated,
root,
ParentCtx::new(&ctx, Some(idx)),
&data_type,
file,
);
let repeater_id = format!("repeater_{}", idx);
let mut model = compile_expression(&repeated.model.borrow(), &ctx);
if repeated.model.ty(&ctx) == Type::Bool {
// bool converts to int
// FIXME: don't do a heap allocation here
model = format!("std::make_shared<slint::private_api::UIntModel>({})", model)
}
// FIXME: optimize if repeated.model.is_constant()
properties_init_code.push(format!(
"self->{repeater_id}.set_model_binding([self] {{ (void)self; return {model}; }});",
repeater_id = repeater_id,
model = model,
));
let ensure_updated = if let Some(listview) = &repeated.listview {
let vp_y = access_member(&listview.viewport_y, &ctx);
let vp_h = access_member(&listview.viewport_height, &ctx);
let lv_h = access_member(&listview.listview_height, &ctx);
let vp_w = access_member(&listview.viewport_width, &ctx);
let lv_w = access_member(&listview.listview_width, &ctx);
format!(
"self->{}.ensure_updated_listview(self, &{}, &{}, &{}, {}.get(), {}.get());",
repeater_id, vp_w, vp_h, vp_y, lv_w, lv_h
)
} else {
format!("self->{id}.ensure_updated(self);", id = repeater_id)
};
children_visitor_cases.push(format!(
"\n case {i}: {{
{e_u}
return self->{id}.visit(order, visitor);
}}",
id = repeater_id,
i = idx,
e_u = ensure_updated,
));
subtrees_ranges_cases.push(format!(
"\n case {i}: {{
{e_u}
return self->{id}.index_range();
}}",
i = idx,
e_u = ensure_updated,
id = repeater_id,
));
subtrees_components_cases.push(format!(
"\n case {i}: {{
{e_u}
*result = self->{id}.component_at(subtree_index);
return;
}}",
i = idx,
e_u = ensure_updated,
id = repeater_id,
));
target_struct.members.push((
field_access,
Declaration::Var(Var {
ty: format!(
"slint::private_api::Repeater<class {}, {}>",
ident(&repeated.sub_tree.root.name),
data_type.cpp_type().unwrap(),
),
name: repeater_id,
..Default::default()
}),
));
}
init.extend(properties_init_code);
user_init.extend(component.init_code.iter().map(|e| {
let mut expr_str = compile_expression(&e.borrow(), &ctx);
expr_str.push(';');
expr_str
}));
target_struct
.members
.extend(generate_functions(&component.functions, &ctx).map(|x| (Access::Public, x)));
target_struct.members.push((
field_access,
Declaration::Function(Function {
name: "init".to_owned(),
signature: format!("({}) -> void", init_parameters.join(",")),
statements: Some(init),
..Default::default()
}),
));
target_struct.members.push((
field_access,
Declaration::Function(Function {
name: "user_init".to_owned(),
signature: "() -> void".into(),
statements: Some(user_init),
..Default::default()
}),
));
target_struct.members.push((
field_access,
Declaration::Function(Function {
name: "layout_info".into(),
signature: "(slint::cbindgen_private::Orientation o) const -> slint::cbindgen_private::LayoutInfo"
.into(),
statements: Some(vec![
"[[maybe_unused]] auto self = this;".into(),
format!(
"return o == slint::cbindgen_private::Orientation::Horizontal ? {} : {};",
compile_expression(&component.layout_info_h.borrow(), &ctx),
compile_expression(&component.layout_info_v.borrow(), &ctx)
),
]),
..Default::default()
}),
));
let mut accessible_function = |name: &str,
signature: &str,
forward_args: &str,
code: Vec<String>| {
let mut code = ["[[maybe_unused]] auto self = this;".into()]
.into_iter()
.chain(code.into_iter())
.collect::<Vec<_>>();
let mut else_ = "";
for sub in &component.sub_components {
let sub_items_count = sub.ty.child_item_count();
code.push(format!("{else_}if (index == {}) {{", sub.index_in_tree,));
code.push(format!(" return self->{}.{name}(0{forward_args});", ident(&sub.name)));
if sub_items_count > 1 {
code.push(format!(
"}} else if (index >= {} && index < {}) {{",
sub.index_of_first_child_in_tree,
sub.index_of_first_child_in_tree + sub_items_count - 1
));
code.push(format!(
" return self->{}.{name}(index - {}{forward_args});",
ident(&sub.name),
sub.index_of_first_child_in_tree - 1
));
}
else_ = "} else ";
}
code.push(format!("{else_}return {{}};"));
target_struct.members.push((
field_access,
Declaration::Function(Function {
name: name.into(),
signature: signature.into(),
statements: Some(code),
..Default::default()
}),
));
};
let mut accessible_role_cases = vec!["switch (index) {".into()];
let mut accessible_string_cases = vec!["switch ((index << 8) | uintptr_t(what)) {".into()];
for ((index, what), expr) in &component.accessible_prop {
let expr = compile_expression(&expr.borrow(), &ctx);
if what == "Role" {
accessible_role_cases.push(format!(" case {index}: return {expr};"));
} else {
accessible_string_cases.push(format!(" case ({index} << 8) | uintptr_t(slint::cbindgen_private::AccessibleStringProperty::{what}): return {expr};"));
}
}
accessible_role_cases.push("}".into());
accessible_string_cases.push("}".into());
accessible_function(
"accessible_role",
"(uintptr_t index) const -> slint::cbindgen_private::AccessibleRole",
"",
accessible_role_cases,
);
accessible_function(
"accessible_string_property",
"(uintptr_t index, slint::cbindgen_private::AccessibleStringProperty what) const -> slint::SharedString",
", what",
accessible_string_cases,
);
if !children_visitor_cases.is_empty() {
target_struct.members.push((
field_access,
Declaration::Function(Function {
name: "visit_dynamic_children".into(),
signature: "(intptr_t dyn_index, [[maybe_unused]] slint::private_api::TraversalOrder order, [[maybe_unused]] slint::private_api::ItemVisitorRefMut visitor) const -> uint64_t".into(),
statements: Some(vec![
" auto self = this;".to_owned(),
format!(" switch(dyn_index) {{ {} }};", children_visitor_cases.join("")),
" std::abort();".to_owned(),
]),
..Default::default()
}),
));
target_struct.members.push((
field_access,
Declaration::Function(Function {
name: "subtree_range".into(),
signature: "(uintptr_t dyn_index) const -> slint::private_api::IndexRange".into(),
statements: Some(vec![
"[[maybe_unused]] auto self = this;".to_owned(),
format!(" switch(dyn_index) {{ {} }};", subtrees_ranges_cases.join("")),
" std::abort();".to_owned(),
]),
..Default::default()
}),
));
target_struct.members.push((
field_access,
Declaration::Function(Function {
name: "subtree_component".into(),
signature: "(uintptr_t dyn_index, [[maybe_unused]] uintptr_t subtree_index, [[maybe_unused]] slint::private_api::ComponentWeak *result) const -> void".into(),
statements: Some(vec![
"[[maybe_unused]] auto self = this;".to_owned(),
format!(" switch(dyn_index) {{ {} }};", subtrees_components_cases.join("")),
" std::abort();".to_owned(),
]),
..Default::default()
}),
));
}
}
fn generate_repeated_component(
repeated: &llr::RepeatedElement,
root: &llr::PublicComponent,
parent_ctx: ParentCtx,
model_data_type: &Type,
file: &mut File,
) {
let repeater_id = ident(&repeated.sub_tree.root.name);
let mut repeater_struct = Struct { name: repeater_id.clone(), ..Default::default() };
generate_item_tree(
&mut repeater_struct,
&repeated.sub_tree,
root,
Some(parent_ctx.clone()),
repeater_id.clone(),
Access::Public,
file,
);
let ctx = EvaluationContext {
public_component: root,
current_sub_component: Some(&repeated.sub_tree.root),
current_global: None,
generator_state: "self".into(),
parent: Some(parent_ctx),
argument_types: &[],
};
let access_prop = |&property_index| {
access_member(
&llr::PropertyReference::Local { sub_component_path: vec![], property_index },
&ctx,
)
};
let index_prop = repeated.index_prop.iter().map(access_prop);
let data_prop = repeated.data_prop.iter().map(access_prop);
let mut update_statements = vec!["[[maybe_unused]] auto self = this;".into()];
update_statements.extend(index_prop.map(|prop| format!("{}.set(i);", prop)));
update_statements.extend(data_prop.map(|prop| format!("{}.set(data);", prop)));
repeater_struct.members.push((
Access::Public, // Because Repeater accesses it
Declaration::Function(Function {
name: "update_data".into(),
signature: format!(
"([[maybe_unused]] int i, [[maybe_unused]] const {} &data) const -> void",
model_data_type.cpp_type().unwrap()
),
statements: Some(update_statements),
..Function::default()
}),
));
repeater_struct.members.push((
Access::Public, // Because Repeater accesses it
Declaration::Function(Function {
name: "init".into(),
signature: "() -> void".into(),
statements: Some(vec!["user_init();".into()]),
..Function::default()
}),
));
if let Some(listview) = &repeated.listview {
let p_y = access_member(&listview.prop_y, &ctx);
let p_height = access_member(&listview.prop_height, &ctx);
let p_width = access_member(&listview.prop_width, &ctx);
repeater_struct.members.push((
Access::Public, // Because Repeater accesses it
Declaration::Function(Function {
name: "listview_layout".into(),
signature:
"(float *offset_y, const slint::private_api::Property<float> *viewport_width) const -> void"
.to_owned(),
statements: Some(vec![
"[[maybe_unused]] auto self = this;".into(),
"float vp_w = viewport_width->get();".to_owned(),
format!("{}.set(*offset_y);", p_y), // FIXME: shouldn't that be handled by apply layout?
format!("*offset_y += {}.get();", p_height),
format!("float w = {}.get();", p_width),
"if (vp_w < w)".to_owned(),
" viewport_width->set(w);".to_owned(),
]),
..Function::default()
}),
));
} else {
repeater_struct.members.push((
Access::Public, // Because Repeater accesses it
Declaration::Function(Function {
name: "box_layout_data".into(),
signature: "(slint::cbindgen_private::Orientation o) const -> slint::cbindgen_private::BoxLayoutCellData".to_owned(),
statements: Some(vec!["return { layout_info({&static_vtable, const_cast<void *>(static_cast<const void *>(this))}, o) };".into()]),
..Function::default()
}),
));
}
if let Some(index_prop) = repeated.index_prop {
// Override default subtree_index function implementation
let subtree_index_func = repeater_struct
.members
.iter_mut()
.find(|(_, d)| matches!(d, Declaration::Function(f) if f.name == "subtree_index"));
if let Declaration::Function(f) = &mut subtree_index_func.unwrap().1 {
let index = access_prop(&index_prop);
f.statements = Some(vec![
format!(
"auto self = reinterpret_cast<const {}*>(component.instance);",
repeater_id
),
format!("return {}.get();", index),
]);
}
}
file.definitions.extend(repeater_struct.extract_definitions().collect::<Vec<_>>());
file.declarations.push(Declaration::Struct(repeater_struct));
}
fn generate_global(file: &mut File, global: &llr::GlobalComponent, root: &llr::PublicComponent) {
let mut global_struct = Struct { name: ident(&global.name), ..Default::default() };
for property in global.properties.iter().filter(|p| p.use_count.get() > 0) {
let cpp_name = ident(&property.name);
let ty = if let Type::Callback { args, return_type } = &property.ty {
let param_types = args.iter().map(|t| t.cpp_type().unwrap()).collect::<Vec<_>>();
let return_type =
return_type.as_ref().map_or("void".to_owned(), |t| t.cpp_type().unwrap());
format!("slint::private_api::Callback<{}({})>", return_type, param_types.join(", "))
} else {
format!("slint::private_api::Property<{}>", property.ty.cpp_type().unwrap())
};
global_struct.members.push((
// FIXME: this is public (and also was public in the pre-llr generator) because other generated code accesses the
// fields directly. But it shouldn't be from an API point of view since the same `global_struct` class is public API
// when the global is exported and exposed in the public component.
Access::Public,
Declaration::Var(Var { ty, name: cpp_name, ..Default::default() }),
));
}
let mut init = vec!["(void)this->root;".into()];
let ctx = EvaluationContext::new_global(root, global, "this->root".into());
for (property_index, expression) in global.init_values.iter().enumerate() {
if global.properties[property_index].use_count.get() == 0 {
continue;
}
if let Some(expression) = expression.as_ref() {
handle_property_init(
&llr::PropertyReference::Local { sub_component_path: vec![], property_index },
expression,
&mut init,
&ctx,
)
}
}
let root_ptr_type = format!("const {} *", ident(&root.item_tree.root.name));
global_struct.members.push((
Access::Public,
Declaration::Function(Function {
name: ident(&global.name),
signature: format!("({} root)", root_ptr_type),
is_constructor_or_destructor: true,
statements: Some(init),
constructor_member_initializers: vec!["root(root)".into()],
..Default::default()
}),
));
global_struct.members.push((
Access::Private,
Declaration::Var(Var { ty: root_ptr_type, name: "root".to_owned(), ..Default::default() }),
));
generate_public_api_for_properties(
&mut global_struct.members,
&global.public_properties,
&global.private_properties,
&ctx,
);
global_struct
.members
.extend(generate_functions(&global.functions, &ctx).map(|x| (Access::Public, x)));
file.definitions.extend(global_struct.extract_definitions().collect::<Vec<_>>());
file.declarations.push(Declaration::Struct(global_struct));
}
fn generate_functions<'a>(
functions: &'a [llr::Function],
ctx: &'a EvaluationContext,
) -> impl Iterator<Item = Declaration> + 'a {
functions.iter().map(|f| {
let mut ctx2 = ctx.clone();
ctx2.argument_types = &f.args;
let body = vec![
"[[maybe_unused]] auto self = this;".into(),
format!("return {};", compile_expression_wrap_return(&f.code, &ctx2)),
];
Declaration::Function(Function {
name: ident(&format!("fn_{}", f.name)),
signature: format!(
"({}) const -> {}",
f.args
.iter()
.enumerate()
.map(|(i, ty)| format!("{} arg_{}", ty.cpp_type().unwrap(), i))
.join(", "),
f.ret_ty.cpp_type().unwrap()
),
statements: Some(body),
..Default::default()
})
})
}
fn generate_public_api_for_properties(
declarations: &mut Vec<(Access, Declaration)>,
public_properties: &llr::PublicProperties,
private_properties: &llr::PrivateProperties,
ctx: &EvaluationContext,
) {
for p in public_properties {
let prop_ident = ident(&p.name);
let access = access_member(&p.prop, ctx);
if let Type::Callback { args, return_type } = &p.ty {
let param_types = args.iter().map(|t| t.cpp_type().unwrap()).collect::<Vec<_>>();
let return_type = return_type.as_ref().map_or("void".into(), |t| t.cpp_type().unwrap());
let callback_emitter = vec![
"[[maybe_unused]] auto self = this;".into(),
format!(
"return {}.call({});",
access,
(0..args.len()).map(|i| format!("arg_{}", i)).join(", ")
),
];
declarations.push((
Access::Public,
Declaration::Function(Function {
name: format!("invoke_{prop_ident}"),
signature: format!(
"({}) const -> {}",
param_types
.iter()
.enumerate()
.map(|(i, ty)| format!("{} arg_{}", ty, i))
.join(", "),
return_type
),
statements: Some(callback_emitter),
..Default::default()
}),
));
declarations.push((
Access::Public,
Declaration::Function(Function {
name: format!("on_{}", ident(&p.name)),
template_parameters: Some(format!(
"std::invocable<{}> Functor",
param_types.join(", "),
)),
signature: "(Functor && callback_handler) const".into(),
statements: Some(vec![
"[[maybe_unused]] auto self = this;".into(),
format!("{}.set_handler(std::forward<Functor>(callback_handler));", access),
]),
..Default::default()
}),
));
} else if let Type::Function { return_type, args } = &p.ty {
let param_types = args.iter().map(|t| t.cpp_type().unwrap()).collect::<Vec<_>>();
let ret = return_type.cpp_type().unwrap();
let call_code = vec![
"[[maybe_unused]] auto self = this;".into(),
format!(
"{}{access}({});",
if **return_type == Type::Void { "" } else { "return " },
(0..args.len()).map(|i| format!("arg_{}", i)).join(", ")
),
];
declarations.push((
Access::Public,
Declaration::Function(Function {
name: format!("invoke_{}", ident(&p.name)),
signature: format!(
"({}) const -> {ret}",
param_types
.iter()
.enumerate()
.map(|(i, ty)| format!("{} arg_{}", ty, i))
.join(", "),
),
statements: Some(call_code),
..Default::default()
}),
));
} else {
let cpp_property_type = p.ty.cpp_type().expect("Invalid type in public properties");
let prop_getter: Vec<String> = vec![
"[[maybe_unused]] auto self = this;".into(),
format!("return {}.get();", access),
];
declarations.push((
Access::Public,
Declaration::Function(Function {
name: format!("get_{}", &prop_ident),
signature: format!("() const -> {}", &cpp_property_type),
statements: Some(prop_getter),
..Default::default()
}),
));
if !p.read_only {
let prop_setter: Vec<String> = vec![
"[[maybe_unused]] auto self = this;".into(),
property_set_value_code(&p.prop, "value", ctx) + ";",
];
declarations.push((
Access::Public,
Declaration::Function(Function {
name: format!("set_{}", &prop_ident),
signature: format!("(const {} &value) const", &cpp_property_type),
statements: Some(prop_setter),
..Default::default()
}),
));
} else {
declarations.push((
Access::Private,
Declaration::Function(Function {
name: format!("set_{}", &prop_ident),
signature: format!(
"(const {cpp_property_type} &) const = delete /* property '{}' is declared as 'out' (read-only). Declare it as 'in' or 'in-out' to enable the setter */", p.name
),
..Default::default()
}),
));
}
}
}
for (name, ty) in private_properties {
let prop_ident = ident(name);
if let Type::Function { args, .. } = &ty {
let param_types = args.iter().map(|t| t.cpp_type().unwrap()).join(", ");
declarations.push((
Access::Private,
Declaration::Function(Function {
name: format!("invoke_{prop_ident}"),
signature: format!(
"({param_types}) const = delete /* the function '{name}' is declared as private. Declare it as 'public' */",
),
..Default::default()
}),
));
} else {
declarations.push((
Access::Private,
Declaration::Function(Function {
name: format!("get_{prop_ident}"),
signature: format!(
"() const = delete /* the property '{name}' is declared as private. Declare it as 'in', 'out', or 'in-out' to make it public */",
),
..Default::default()
}),
));
declarations.push((
Access::Private,
Declaration::Function(Function {
name: format!("set_{}", &prop_ident),
signature: format!(
"(const auto &) const = delete /* property '{name}' is declared as private. Declare it as 'in' or 'in-out' to make it public */",
),
..Default::default()
}),
));
}
}
}
fn follow_sub_component_path<'a>(
root: &'a llr::SubComponent,
sub_component_path: &[usize],
) -> (String, &'a llr::SubComponent) {
let mut compo_path = String::new();
let mut sub_component = root;
for i in sub_component_path {
let sub_component_name = ident(&sub_component.sub_components[*i].name);
write!(compo_path, "{}.", sub_component_name).unwrap();
sub_component = &sub_component.sub_components[*i].ty;
}
(compo_path, sub_component)
}
fn access_window_field(ctx: &EvaluationContext) -> String {
let root = &ctx.generator_state;
format!("{}->window().window_handle()", root)
}
/// Returns the code that can access the given property (but without the set or get)
///
/// to be used like:
/// ```ignore
/// let access = access_member(...);
/// format!("{}.get()", access)
/// ```
/// or for a function
/// ```ignore
/// let access = access_member(...);
/// format!("{access}(...)")
/// ```
fn access_member(reference: &llr::PropertyReference, ctx: &EvaluationContext) -> String {
fn in_native_item(
ctx: &EvaluationContext,
sub_component_path: &[usize],
item_index: usize,
prop_name: &str,
path: &str,
) -> String {
let (compo_path, sub_component) =
follow_sub_component_path(ctx.current_sub_component.unwrap(), sub_component_path);
let item_name = ident(&sub_component.items[item_index].name);
if prop_name.is_empty() {
// then this is actually a reference to the element itself
format!("{}->{}{}", path, compo_path, item_name)
} else {
let property_name = ident(prop_name);
let flick = sub_component.items[item_index]
.is_flickable_viewport
.then(|| "viewport.")
.unwrap_or_default();
format!("{}->{}{}.{}{}", path, compo_path, item_name, flick, property_name)
}
}
match reference {
llr::PropertyReference::Local { sub_component_path, property_index } => {
if let Some(sub_component) = ctx.current_sub_component {
let (compo_path, sub_component) =
follow_sub_component_path(sub_component, sub_component_path);
let property_name = ident(&sub_component.properties[*property_index].name);
format!("self->{}{}", compo_path, property_name)
} else if let Some(current_global) = ctx.current_global {
format!("this->{}", ident(&current_global.properties[*property_index].name))
} else {
unreachable!()
}
}
llr::PropertyReference::Function { sub_component_path, function_index } => {
if let Some(sub_component) = ctx.current_sub_component {
let (compo_path, sub_component) =
follow_sub_component_path(sub_component, sub_component_path);
let name = ident(&sub_component.functions[*function_index].name);
format!("self->{compo_path}fn_{name}")
} else if let Some(current_global) = ctx.current_global {
format!("this->fn_{}", ident(&current_global.functions[*function_index].name))
} else {
unreachable!()
}
}
llr::PropertyReference::InNativeItem { sub_component_path, item_index, prop_name } => {
in_native_item(ctx, sub_component_path, *item_index, prop_name, "self")
}
llr::PropertyReference::InParent { level, parent_reference } => {
let mut ctx = ctx;
let mut path = "self".to_string();
for _ in 0..level.get() {
write!(path, "->parent").unwrap();
ctx = ctx.parent.as_ref().unwrap().ctx;
}
match &**parent_reference {
llr::PropertyReference::Local { sub_component_path, property_index } => {
let sub_component = ctx.current_sub_component.unwrap();
let (compo_path, sub_component) =
follow_sub_component_path(sub_component, sub_component_path);
let property_name = ident(&sub_component.properties[*property_index].name);
format!("{}->{}{}", path, compo_path, property_name)
}
llr::PropertyReference::Function { sub_component_path, function_index } => {
let sub_component = ctx.current_sub_component.unwrap();
let (compo_path, sub_component) =
follow_sub_component_path(sub_component, sub_component_path);
let name = ident(&sub_component.functions[*function_index].name);
format!("{path}->{compo_path}fn_{name}")
}
llr::PropertyReference::InNativeItem {
sub_component_path,
item_index,
prop_name,
} => in_native_item(ctx, sub_component_path, *item_index, prop_name, &path),
llr::PropertyReference::InParent { .. }
| llr::PropertyReference::Global { .. }
| llr::PropertyReference::GlobalFunction { .. } => {
unreachable!()
}
}
}
llr::PropertyReference::Global { global_index, property_index } => {
let root_access = &ctx.generator_state;
let global = &ctx.public_component.globals[*global_index];
let global_id = format!("global_{}", ident(&global.name));
let property_name = ident(
&ctx.public_component.globals[*global_index].properties[*property_index].name,
);
format!("{}->{}->{}", root_access, global_id, property_name)
}
llr::PropertyReference::GlobalFunction { global_index, function_index } => {
let root_access = &ctx.generator_state;
let global = &ctx.public_component.globals[*global_index];
let global_id = format!("global_{}", ident(&global.name));
let name =
ident(&ctx.public_component.globals[*global_index].functions[*function_index].name);
format!("{root_access}->{global_id}->fn_{name}")
}
}
}
/// Returns the NativeClass for a PropertyReference::InNativeItem
/// (or a InParent of InNativeItem )
fn native_item<'a>(
item_ref: &llr::PropertyReference,
ctx: &'a EvaluationContext,
) -> &'a NativeClass {
match item_ref {
llr::PropertyReference::InNativeItem { sub_component_path, item_index, prop_name: _ } => {
let mut sub_component = ctx.current_sub_component.unwrap();
for i in sub_component_path {
sub_component = &sub_component.sub_components[*i].ty;
}
&sub_component.items[*item_index].ty
}
llr::PropertyReference::InParent { level, parent_reference } => {
let mut ctx = ctx;
for _ in 0..level.get() {
ctx = ctx.parent.as_ref().unwrap().ctx;
}
native_item(parent_reference, ctx)
}
_ => unreachable!(),
}
}
fn compile_expression(expr: &llr::Expression, ctx: &EvaluationContext) -> String {
use llr::Expression;
match expr {
Expression::StringLiteral(s) => {
format!(r#"slint::SharedString(u8"{}")"#, escape_string(s.as_str()))
}
Expression::NumberLiteral(num) => {
if *num > 1_000_000_000. {
// If the numbers are too big, decimal notation will give too many digit
format!("{:+e}", num)
} else {
num.to_string()
}
}
Expression::BoolLiteral(b) => b.to_string(),
Expression::PropertyReference(nr) => {
let access = access_member(nr, ctx);
format!(r#"{}.get()"#, access)
}
Expression::BuiltinFunctionCall { function, arguments } => {
compile_builtin_function_call(function.clone(), arguments, ctx)
}
Expression::CallBackCall{ callback, arguments } => {
let f = access_member(callback, ctx);
let mut a = arguments.iter().map(|a| compile_expression(a, ctx));
format!("{}.call({})", f, a.join(","))
}
Expression::FunctionCall{ function, arguments } => {
let f = access_member(function, ctx);
let mut a = arguments.iter().map(|a| compile_expression(a, ctx));
format!("{}({})", f, a.join(","))
}
Expression::ExtraBuiltinFunctionCall { function, arguments, return_ty: _ } => {
let mut a = arguments.iter().map(|a| compile_expression(a, ctx));
format!("slint::private_api::{}({})", ident(function), a.join(","))
}
Expression::FunctionParameterReference { index, .. } => format!("arg_{}", index),
Expression::StoreLocalVariable { name, value } => {
format!("auto {} = {};", ident(name), compile_expression(value, ctx))
}
Expression::ReadLocalVariable { name, .. } => ident(name),
Expression::StructFieldAccess { base, name } => match base.ty(ctx) {
Type::Struct { fields, name : None, .. } => {
let index = fields
.keys()
.position(|k| k == name)
.expect("Expression::ObjectAccess: Cannot find a key in an object");
format!("std::get<{}>({})", index, compile_expression(base, ctx))
}
Type::Struct{..} => {
format!("{}.{}", compile_expression(base, ctx), ident(name))
}
_ => panic!("Expression::ObjectAccess's base expression is not an Object type"),
},
Expression::ArrayIndex { array, index } => {
format!(
"slint::private_api::access_array_index({}, {})",
compile_expression(array, ctx), compile_expression(index, ctx)
)
},
Expression::Cast { from, to } => {
let f = compile_expression(&*from, ctx);
match (from.ty(ctx), to) {
(from, Type::String) if from.as_unit_product().is_some() => {
format!("slint::SharedString::from_number({})", f)
}
(Type::Float32, Type::Model) | (Type::Int32, Type::Model) => {
format!("std::make_shared<slint::private_api::UIntModel>(std::max(0, {}))", f)
}
(Type::Array(_), Type::Model) => f,
(Type::Float32, Type::Color) => {
format!("slint::Color::from_argb_encoded({})", f)
}
(Type::Color, Type::Brush) => {
format!("slint::Brush({})", f)
}
(Type::Brush, Type::Color) => {
format!("{}.color()", f)
}
(Type::Struct { .. }, Type::Struct{ fields, name: Some(_), ..}) => {
format!(
"[&](const auto &o){{ {struct_name} s; {fields} return s; }}({obj})",
struct_name = to.cpp_type().unwrap(),
fields = fields.keys().enumerate().map(|(i, n)| format!("s.{} = std::get<{}>(o); ", ident(n), i)).join(""),
obj = f,
)
}
(Type::Array(..), Type::PathData)
if matches!(
from.as_ref(),
Expression::Array { element_ty: Type::Struct { .. }, .. }
) =>
{
let path_elements = match from.as_ref() {
Expression::Array { element_ty: _, values, as_model: _ } => values
.iter()
.map(|path_elem_expr| {
let (field_count, qualified_elem_type_name) = match path_elem_expr.ty(ctx) {
Type::Struct{ fields, name: Some(name), .. } => (fields.len(), name),
_ => unreachable!()
};
// Turn slint::private_api::PathLineTo into `LineTo`
let elem_type_name = qualified_elem_type_name.split("::").last().unwrap().strip_prefix("Path").unwrap();
let elem_init = if field_count > 0 {
compile_expression(path_elem_expr, ctx)
} else {
String::new()
};
format!("slint::private_api::PathElement::{}({})", elem_type_name, elem_init)
}),
_ => {
unreachable!()
}
}.collect::<Vec<_>>();
format!(
r#"[&](){{
slint::private_api::PathElement elements[{}] = {{
{}
}};
return slint::private_api::PathData(&elements[0], std::size(elements));
}}()"#,
path_elements.len(),
path_elements.join(",")
)
}
(Type::Struct { .. }, Type::PathData)
if matches!(
from.as_ref(),
Expression::Struct { ty: Type::Struct { .. }, .. }
) =>
{
let (events, points) = match from.as_ref() {
Expression::Struct { ty: _, values } => (
compile_expression(&values["events"], ctx),
compile_expression(&values["points"], ctx),
),
_ => {
unreachable!()
}
};
format!(
r#"[&](auto events, auto points){{
return slint::private_api::PathData(events.ptr, events.len, points.ptr, points.len);
}}({}, {})"#,
events, points
)
}
_ => f,
}
}
Expression::CodeBlock(sub) => {
let len = sub.len();
let mut x = sub.iter().enumerate().map(|(i, e)| {
if i == len - 1 {
return_compile_expression(e, ctx, None) + ";"
}
else {
compile_expression(e, ctx)
}
});
format!("[&]{{ {} }}()", x.join(";"))
}
Expression::PropertyAssignment { property, value} => {
let value = compile_expression(value, ctx);
property_set_value_code(property, &value, ctx)
}
Expression::ModelDataAssignment { level, value } => {
let value = compile_expression(value, ctx);
let mut path = "self".to_string();
let mut ctx2 = ctx;
let mut repeater_index = None;
for _ in 0..=*level {
let x = ctx2.parent.clone().unwrap();
ctx2 = x.ctx;
repeater_index = x.repeater_index;
write!(path, "->parent").unwrap();
}
let repeater_index = repeater_index.unwrap();
let mut index_prop = llr::PropertyReference::Local {
sub_component_path: vec![],
property_index: ctx2.current_sub_component.unwrap().repeated[repeater_index]
.index_prop
.unwrap(),
};
if let Some(level) = NonZeroUsize::new(*level) {
index_prop =
llr::PropertyReference::InParent { level, parent_reference: index_prop.into() };
}
let index_access = access_member(&index_prop, ctx);
write!(path, "->repeater_{}", repeater_index).unwrap();
format!("{}.model_set_row_data({}.get(), {})", path, index_access, value)
}
Expression::ArrayIndexAssignment { array, index, value } => {
debug_assert!(matches!(array.ty(ctx), Type::Array(_)));
let base_e = compile_expression(array, ctx);
let index_e = compile_expression(index, ctx);
let value_e = compile_expression(value, ctx);
format!(
"{}->set_row_data({}, {})",
base_e, index_e, value_e
)
}
Expression::BinaryExpression { lhs, rhs, op } => {
let mut buffer = [0; 3];
format!(
"({lhs} {op} {rhs})",
lhs = compile_expression(&*lhs, ctx),
rhs = compile_expression(&*rhs, ctx),
op = match op {
'=' => "==",
'!' => "!=",
'≤' => "<=",
'≥' => ">=",
'&' => "&&",
'|' => "||",
'/' => "/(float)",
_ => op.encode_utf8(&mut buffer),
},
)
}
Expression::UnaryOp { sub, op } => {
format!("({op} {sub})", sub = compile_expression(&*sub, ctx), op = op,)
}
Expression::ImageReference { resource_ref, .. } => {
match resource_ref {
crate::expression_tree::ImageReference::None => r#"slint::Image()"#.to_string(),
crate::expression_tree::ImageReference::AbsolutePath(path) => format!(r#"slint::Image::load_from_path(slint::SharedString(u8"{}"))"#, escape_string(path.as_str())),
crate::expression_tree::ImageReference::EmbeddedData { resource_id, extension } => {
let symbol = format!("slint_embedded_resource_{}", resource_id);
format!(r#"slint::private_api::load_image_from_embedded_data({symbol}, "{}")"#, escape_string(extension))
}
crate::expression_tree::ImageReference::EmbeddedTexture{resource_id} => {
format!("slint::private_api::image_from_embedded_textures(&slint_embedded_resource_{resource_id})")
},
}
}
Expression::Condition { condition, true_expr, false_expr } => {
let ty = expr.ty(ctx);
let cond_code = compile_expression(condition, ctx);
let cond_code = remove_parentheses(&cond_code);
let true_code = return_compile_expression(true_expr, ctx, Some(&ty));
let false_code = return_compile_expression(false_expr, ctx, Some(&ty));
format!(
r#"[&]() -> {} {{ if ({}) {{ {}; }} else {{ {}; }}}}()"#,
ty.cpp_type().unwrap_or_else(|| "void".to_string()),
cond_code,
true_code,
false_code
)
}
Expression::Array { element_ty, values, as_model } => {
let ty = element_ty.cpp_type().unwrap();
let mut val = values.iter().map(|e| format!("{ty} ( {expr} )", expr = compile_expression(e, ctx), ty = ty));
if *as_model {
format!(
"std::make_shared<slint::private_api::ArrayModel<{count},{ty}>>({val})",
count = values.len(),
ty = ty,
val = val.join(", ")
)
} else {
format!(
"slint::cbindgen_private::Slice<{ty}>{{ std::array<{ty}, {count}>{{ {val} }}.data(), {count} }}",
count = values.len(),
ty = ty,
val = val.join(", ")
)
}
}
Expression::Struct { ty, values } => {
if let Type::Struct{fields, name: None, ..} = ty {
let mut elem = fields.keys().map(|k| {
values
.get(k)
.map(|e| compile_expression(e, ctx))
.unwrap_or_else(|| "(Error: missing member in object)".to_owned())
});
format!("std::make_tuple({})", elem.join(", "))
} else if let Type::Struct{ name: Some(_), .. } = ty {
format!(
"[&]({args}){{ {ty} o{{}}; {fields}return o; }}({vals})",
args = (0..values.len()).map(|i| format!("const auto &a_{}", i)).join(", "),
ty = ty.cpp_type().unwrap(),
fields = values.keys().enumerate().map(|(i, f)| format!("o.{} = a_{}; ", ident(f), i)).join(""),
vals = values.values().map(|e| compile_expression(e, ctx)).join(", "),
)
} else {
panic!("Expression::Object is not a Type::Object")
}
}
Expression::EasingCurve(EasingCurve::Linear) => "slint::cbindgen_private::EasingCurve()".into(),
Expression::EasingCurve(EasingCurve::CubicBezier(a, b, c, d)) => format!(
"slint::cbindgen_private::EasingCurve(slint::cbindgen_private::EasingCurve::Tag::CubicBezier, {}, {}, {}, {})",
a, b, c, d
),
Expression::LinearGradient{angle, stops} => {
let angle = compile_expression(angle, ctx);
let mut stops_it = stops.iter().map(|(color, stop)| {
let color = compile_expression(color, ctx);
let position = compile_expression(stop, ctx);
format!("slint::private_api::GradientStop{{ {}, {}, }}", color, position)
});
format!(
"[&] {{ const slint::private_api::GradientStop stops[] = {{ {} }}; return slint::Brush(slint::private_api::LinearGradientBrush({}, stops, {})); }}()",
stops_it.join(", "), angle, stops.len()
)
}
Expression::RadialGradient{ stops} => {
let mut stops_it = stops.iter().map(|(color, stop)| {
let color = compile_expression(color, ctx);
let position = compile_expression(stop, ctx);
format!("slint::private_api::GradientStop{{ {}, {}, }}", color, position)
});
format!(
"[&] {{ const slint::private_api::GradientStop stops[] = {{ {} }}; return slint::Brush(slint::private_api::RadialGradientBrush(stops, {})); }}()",
stops_it.join(", "), stops.len()
)
}
Expression::EnumerationValue(value) => {
format!(
"slint::cbindgen_private::{}::{}",
value.enumeration.name,
ident(&value.to_pascal_case()),
)
}
Expression::ReturnStatement(Some(expr)) => format!(
"throw slint::private_api::ReturnWrapper<{}>({})",
expr.ty(ctx).cpp_type().unwrap_or_default(),
compile_expression(expr, ctx)
),
Expression::ReturnStatement(None) => "throw slint::private_api::ReturnWrapper<void>()".to_owned(),
Expression::LayoutCacheAccess { layout_cache_prop, index, repeater_index } => {
let cache = access_member(layout_cache_prop, ctx);
if let Some(ri) = repeater_index {
format!("slint::private_api::layout_cache_access({}.get(), {}, {})", cache, index, compile_expression(ri, ctx))
} else {
format!("{}.get()[{}]", cache, index)
}
}
Expression::BoxLayoutFunction {
cells_variable,
repeater_indices,
elements,
orientation,
sub_expression,
} => box_layout_function(
cells_variable,
repeater_indices.as_ref().map(String::as_str),
elements,
*orientation,
sub_expression,
ctx,
),
Expression::ComputeDialogLayoutCells { cells_variable, roles, unsorted_cells } => {
let cells_variable = ident(cells_variable);
let mut cells = match &**unsorted_cells {
Expression::Array { values, .. } => {
values.iter().map(|v| compile_expression(v, ctx))
}
_ => panic!("dialog layout unsorted cells not an array"),
};
format!("slint::cbindgen_private::GridLayoutCellData {cv}_array [] = {{ {c} }};\
slint::cbindgen_private::slint_reorder_dialog_button_layout({cv}_array, {r});\
slint::cbindgen_private::Slice<slint::cbindgen_private::GridLayoutCellData> {cv} {{ std::data({cv}_array), std::size({cv}_array) }}",
r = compile_expression(roles, ctx),
cv = cells_variable,
c = cells.join(", "),
)
}
}
}
fn compile_builtin_function_call(
function: BuiltinFunction,
arguments: &[llr::Expression],
ctx: &EvaluationContext,
) -> String {
let mut a = arguments.iter().map(|a| compile_expression(a, ctx));
let pi_180 = std::f64::consts::PI / 180.0;
match function {
BuiltinFunction::GetWindowScaleFactor => {
let window = access_window_field(ctx);
format!("{}.scale_factor()", window)
}
BuiltinFunction::GetWindowDefaultFontSize => {
let window_item_name = ident(&ctx.public_component.item_tree.root.items[0].name);
format!("{}->{}.default_font_size.get()", ctx.generator_state, window_item_name)
}
BuiltinFunction::AnimationTick => "slint::cbindgen_private::slint_animation_tick()".into(),
BuiltinFunction::Debug => {
format!("std::cout << {} << std::endl;", a.join("<<"))
}
BuiltinFunction::Mod => format!("std::fmod({}, {})", a.next().unwrap(), a.next().unwrap()),
BuiltinFunction::Round => format!("std::round({})", a.next().unwrap()),
BuiltinFunction::Ceil => format!("std::ceil({})", a.next().unwrap()),
BuiltinFunction::Floor => format!("std::floor({})", a.next().unwrap()),
BuiltinFunction::Sqrt => format!("std::sqrt({})", a.next().unwrap()),
BuiltinFunction::Abs => format!("std::abs({})", a.next().unwrap()),
BuiltinFunction::Log => {
format!("std::log({}) / std::log({})", a.next().unwrap(), a.next().unwrap())
}
BuiltinFunction::Pow => {
format!("std::pow(({}), ({}))", a.next().unwrap(), a.next().unwrap())
}
BuiltinFunction::Sin => format!("std::sin(({}) * {})", a.next().unwrap(), pi_180),
BuiltinFunction::Cos => format!("std::cos(({}) * {})", a.next().unwrap(), pi_180),
BuiltinFunction::Tan => format!("std::tan(({}) * {})", a.next().unwrap(), pi_180),
BuiltinFunction::ASin => format!("std::asin({}) / {}", a.next().unwrap(), pi_180),
BuiltinFunction::ACos => format!("std::acos({}) / {}", a.next().unwrap(), pi_180),
BuiltinFunction::ATan => format!("std::atan({}) / {}", a.next().unwrap(), pi_180),
BuiltinFunction::SetFocusItem => {
if let [llr::Expression::PropertyReference(pr)] = arguments {
let window = access_window_field(ctx);
let focus_item = access_item_rc(pr, ctx);
format!("{}.set_focus_item({});", window, focus_item)
} else {
panic!("internal error: invalid args to SetFocusItem {:?}", arguments)
}
}
/* std::from_chars is unfortunately not yet implemented in gcc
BuiltinFunction::StringIsFloat => {
"[](const auto &a){ double v; auto r = std::from_chars(std::begin(a), std::end(a), v); return r.ptr == std::end(a); }"
.into()
}
BuiltinFunction::StringToFloat => {
"[](const auto &a){ double v; auto r = std::from_chars(std::begin(a), std::end(a), v); return r.ptr == std::end(a) ? v : 0; }"
.into()
}*/
BuiltinFunction::StringIsFloat => {
format!("[](const auto &a){{ auto e1 = std::end(a); auto e2 = const_cast<char*>(e1); std::strtod(std::begin(a), &e2); return e1 == e2; }}({})", a.next().unwrap())
}
BuiltinFunction::StringToFloat => {
format!("[](const auto &a){{ auto e1 = std::end(a); auto e2 = const_cast<char*>(e1); auto r = std::strtod(std::begin(a), &e2); return e1 == e2 ? r : 0; }}({})", a.next().unwrap())
}
BuiltinFunction::ColorBrighter => {
format!("{}.brighter({})", a.next().unwrap(), a.next().unwrap())
}
BuiltinFunction::ColorDarker => {
format!("{}.darker({})", a.next().unwrap(), a.next().unwrap())
}
BuiltinFunction::ColorTransparentize => {
format!("{}.transparentize({})", a.next().unwrap(), a.next().unwrap())
}
BuiltinFunction::ColorMix => {
format!("{}.mix({}, {})", a.next().unwrap(), a.next().unwrap(), a.next().unwrap())
}
BuiltinFunction::ColorWithAlpha => {
format!("{}.with_alpha({})", a.next().unwrap(), a.next().unwrap())
}
BuiltinFunction::ImageSize => {
format!("{}.size()", a.next().unwrap())
}
BuiltinFunction::ArrayLength => {
// note: cast to "long" to avoid signed vs signed comparison warning, because all other integers coming from slint are signed
format!("[](const auto &model){{ (*model).track_row_count_changes(); return long((*model).row_count()); }}({})", a.next().unwrap())
}
BuiltinFunction::Rgb => {
format!("slint::Color::from_argb_uint8(std::clamp(static_cast<float>({a}) * 255., 0., 255.), std::clamp(static_cast<int>({r}), 0, 255), std::clamp(static_cast<int>({g}), 0, 255), std::clamp(static_cast<int>({b}), 0, 255))",
r = a.next().unwrap(),
g = a.next().unwrap(),
b = a.next().unwrap(),
a = a.next().unwrap(),
)
}
BuiltinFunction::DarkColorScheme => {
format!("{}.dark_color_scheme()", access_window_field(ctx))
}
BuiltinFunction::SetTextInputFocused => {
format!("{}.set_text_input_focused({})", access_window_field(ctx), a.next().unwrap())
}
BuiltinFunction::TextInputFocused => {
format!("{}.text_input_focused()", access_window_field(ctx))
}
BuiltinFunction::ShowPopupWindow => {
if let [llr::Expression::NumberLiteral(popup_index), x, y, close_on_click, llr::Expression::PropertyReference(parent_ref)] =
arguments
{
let mut parent_ctx = ctx;
let mut component_access = "self".into();
if let llr::PropertyReference::InParent { level, .. } = parent_ref {
for _ in 0..level.get() {
component_access = format!("{}->parent", component_access);
parent_ctx = parent_ctx.parent.as_ref().unwrap().ctx;
}
};
let window = access_window_field(ctx);
let current_sub_component = parent_ctx.current_sub_component.unwrap();
let popup_window_id =
ident(&current_sub_component.popup_windows[*popup_index as usize].root.name);
let parent_component = access_item_rc(parent_ref, ctx);
let x = compile_expression(x, ctx);
let y = compile_expression(y, ctx);
let close_on_click = compile_expression(close_on_click, ctx);
format!(
"{window}.show_popup<{popup_window_id}>({component_access}, {{ static_cast<float>({x}), static_cast<float>({y}) }}, {close_on_click}, {{ {parent_component} }})"
)
} else {
panic!("internal error: invalid args to ShowPopupWindow {:?}", arguments)
}
}
BuiltinFunction::ClosePopupWindow => {
let window = access_window_field(ctx);
format!("{window}.close_popup()")
}
BuiltinFunction::ItemMemberFunction(name) => {
if let [llr::Expression::PropertyReference(pr)] = arguments {
let item = access_member(pr, ctx);
let item_rc = access_item_rc(pr, ctx);
let window = access_window_field(ctx);
let native = native_item(pr, ctx);
let function_name = format!(
"slint_{}_{}",
native.class_name.to_lowercase(),
ident(&name).to_lowercase()
);
format!("{function_name}(&{item}, &{window}.handle(), &{item_rc})")
} else {
panic!("internal error: invalid args to ItemMemberFunction {:?}", arguments)
}
}
BuiltinFunction::RegisterCustomFontByPath => {
if let [llr::Expression::StringLiteral(path)] = arguments {
let window = access_window_field(ctx);
format!("{window}.register_font_from_path(\"{}\");", escape_string(path))
} else {
panic!(
"internal error: argument to RegisterCustomFontByPath must be a string literal"
)
}
}
BuiltinFunction::RegisterCustomFontByMemory => {
if let [llr::Expression::NumberLiteral(resource_id)] = &arguments {
let window = access_window_field(ctx);
let resource_id: usize = *resource_id as _;
let symbol = format!("slint_embedded_resource_{}", resource_id);
format!("{window}.register_font_from_data({symbol}, std::size({symbol}));")
} else {
panic!("internal error: invalid args to RegisterCustomFontByMemory {:?}", arguments)
}
}
BuiltinFunction::RegisterBitmapFont => {
// TODO
"/*TODO: REGISTER FONT*/".into()
}
BuiltinFunction::ImplicitLayoutInfo(orient) => {
if let [llr::Expression::PropertyReference(pr)] = arguments {
let native = native_item(pr, ctx);
format!(
"{vt}->layout_info({{{vt}, const_cast<slint::cbindgen_private::{ty}*>(&{i})}}, {o}, &{window})",
vt = native.cpp_vtable_getter,
ty = native.class_name,
o = to_cpp_orientation(orient),
i = access_member(pr, ctx),
window = access_window_field(ctx)
)
} else {
panic!("internal error: invalid args to ImplicitLayoutInfo {:?}", arguments)
}
}
BuiltinFunction::Translate => {
format!("slint::private_api::translate({});", a.join(","))
}
}
}
fn box_layout_function(
cells_variable: &str,
repeated_indices: Option<&str>,
elements: &[Either<llr::Expression, usize>],
orientation: Orientation,
sub_expression: &llr::Expression,
ctx: &llr_EvaluationContext<String>,
) -> String {
let repeated_indices = repeated_indices.map(ident);
let mut push_code =
"std::vector<slint::cbindgen_private::BoxLayoutCellData> cells_vector;".to_owned();
let mut repeater_idx = 0usize;
for item in elements {
match item {
Either::Left(value) => {
write!(
push_code,
"cells_vector.push_back({{ {} }});",
compile_expression(value, ctx)
)
.unwrap();
}
Either::Right(repeater) => {
write!(push_code, "self->repeater_{}.ensure_updated(self);", repeater).unwrap();
if let Some(ri) = &repeated_indices {
write!(push_code, "{}_array[{}] = cells_vector.size();", ri, repeater_idx * 2)
.unwrap();
write!(push_code,
"{ri}_array[{c}] = self->repeater_{id}.inner ? self->repeater_{id}.inner->data.size() : 0;",
ri = ri,
c = repeater_idx * 2 + 1,
id = repeater,
).unwrap();
}
repeater_idx += 1;
write!(
push_code,
"if (self->repeater_{id}.inner) \
for (auto &&sub_comp : self->repeater_{id}.inner->data) \
cells_vector.push_back((*sub_comp.ptr)->box_layout_data({o}));",
id = repeater,
o = to_cpp_orientation(orientation),
)
.unwrap();
}
}
}
let ri = repeated_indices.as_ref().map_or(String::new(), |ri| {
write!(
push_code,
"slint::cbindgen_private::Slice<int> {ri}{{ {ri}_array.data(), {ri}_array.size() }};",
ri = ri
)
.unwrap();
format!("std::array<int, {}> {}_array;", 2 * repeater_idx, ri)
});
format!(
"[&]{{ {} {} slint::cbindgen_private::Slice<slint::cbindgen_private::BoxLayoutCellData>{}{{cells_vector.data(), cells_vector.size()}}; return {}; }}()",
ri,
push_code,
ident(cells_variable),
compile_expression(sub_expression, ctx)
)
}
/// Like compile_expression, but wrap inside a try{}catch{} block to intercept the return
fn compile_expression_wrap_return(expr: &llr::Expression, ctx: &EvaluationContext) -> String {
let mut return_type = None;
expr.visit_recursive(&mut |e| {
if let llr::Expression::ReturnStatement(val) = e {
return_type = Some(val.as_ref().map_or(Type::Void, |v| v.ty(ctx)));
}
});
if let Some(ty) = return_type {
if ty == Type::Void || ty == Type::Invalid {
format!(
"[&]{{ try {{ {}; }} catch(const slint::private_api::ReturnWrapper<void> &w) {{ }} }}()",
compile_expression(expr, ctx)
)
} else {
let cpp_ty = ty.cpp_type().unwrap_or_default();
format!(
"[&]() -> {} {{ try {{ {}; }} catch(const slint::private_api::ReturnWrapper<{}> &w) {{ return w.value; }} }}()",
cpp_ty,
return_compile_expression(expr, ctx, Some(&ty)),
cpp_ty
)
}
} else {
compile_expression(expr, ctx)
}
}
/// Like compile expression, but prepended with `return` if not void.
/// ret_type is the expecting type that should be returned with that return statement
fn return_compile_expression(
expr: &llr::Expression,
ctx: &EvaluationContext,
ret_type: Option<&Type>,
) -> String {
let e = compile_expression(expr, ctx);
if ret_type == Some(&Type::Void) || ret_type == Some(&Type::Invalid) {
e
} else {
let ty = expr.ty(ctx);
if ty == Type::Invalid && ret_type.is_some() {
// e is unreachable so it probably throws. But we still need to return something to avoid a warning
format!("{}; return {{}}", e)
} else if ty == Type::Invalid || ty == Type::Void {
e
} else {
format!("return {}", e)
}
}
}
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