slint/sixtyfps_compiler/passes/remove_unused_properties.rs

/* LICENSE BEGIN
    This file is part of the SixtyFPS Project -- https://sixtyfps.io
    Copyright (c) 2021 Olivier Goffart <olivier.goffart@sixtyfps.io>
    Copyright (c) 2021 Simon Hausmann <simon.hausmann@sixtyfps.io>

    SPDX-License-Identifier: GPL-3.0-only
    This file is also available under commercial licensing terms.
    Please contact info@sixtyfps.io for more information.
LICENSE END */
//! Remove the properties which are not used

use crate::object_tree::Component;
use std::collections::HashSet;

pub fn remove_unused_properties(component: &Component) {
    fn recurse_remove_unused_properties(component: &Component) {
        crate::object_tree::recurse_elem_including_sub_components_no_borrow(
            component,
            &(),
            &mut |elem, _| {
                let mut to_remove = HashSet::new();
                for (prop, decl) in &elem.borrow().property_declarations {
                    if !decl.expose_in_public_api
                        && !elem.borrow().named_references.is_referenced(prop)
                        && !elem
                            .borrow()
                            .property_analysis
                            .borrow()
                            .get(prop)
                            .map_or(false, |v| v.is_used())
                    {
                        to_remove.insert(prop.to_owned());
                    }
                }
                let mut elem = elem.borrow_mut();
                for x in &to_remove {
                    elem.property_declarations.remove(x);
                    elem.property_analysis.borrow_mut().remove(x);
                    elem.bindings.remove(x);
                }
            },
        );

        for global in &component.used_types.borrow().globals {
            recurse_remove_unused_properties(global);
        }
    }
    recurse_remove_unused_properties(component)
}