mirror of
https://github.com/servo/servo.git
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f19b2f6e84
Adds a global preference observer that is notified whenever any preference value is updated. This is used to support runtime configuration of WebXR automated testing, which is a prerequisite for running multiple WPT tests in a single browser session. Testing: Ran `./mach test-wpt /webxr --product=servodriver` Fixes: #38647 --------- Signed-off-by: Josh Matthews <josh@joshmatthews.net>
67 lines
2.3 KiB
Rust
67 lines
2.3 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
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use proc_macro2::TokenStream;
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use quote::quote;
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use syn::{Data, Fields};
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use synstructure::decl_derive;
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decl_derive!([ServoPreferences] => servo_preferences_derive);
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/// A derive macro that adds string-based getter and setter for each field of this struct
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/// (enums and other types are not supported). Each field must be able to be convertable
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/// (with `into()`) into a `PrefValue`.
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fn servo_preferences_derive(input: synstructure::Structure) -> TokenStream {
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let ast = input.ast();
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let Data::Struct(ref data) = ast.data else {
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unimplemented!();
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};
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let Fields::Named(ref named_fields) = data.fields else {
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unimplemented!()
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};
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let mut get_match_cases = quote!();
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for field in named_fields.named.iter() {
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let name = field.ident.as_ref().unwrap();
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get_match_cases.extend(quote!(stringify!(#name) => self.#name.clone().into(),))
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}
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let mut set_match_cases = quote!();
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for field in named_fields.named.iter() {
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let name = field.ident.as_ref().unwrap();
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set_match_cases.extend(quote!(stringify!(#name) => self.#name = value.try_into().unwrap(),))
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}
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let mut comparisons = quote!();
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for field in named_fields.named.iter() {
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let name = field.ident.as_ref().unwrap();
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comparisons.extend(quote!(if self.#name != other.#name { changes.push((stringify!(#name), self.#name.clone().into(),)) }))
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}
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let structure_name = &ast.ident;
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quote! {
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impl #structure_name {
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pub fn get_value(&self, name: &str) -> PrefValue {
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match name {
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#get_match_cases
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_ => { panic!("Unknown preference: {:?}", name); }
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}
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}
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pub fn set_value(&mut self, name: &str, value: PrefValue) {
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match name {
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#set_match_cases
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_ => { panic!("Unknown preference: {:?}", name); }
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}
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}
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pub fn diff(&self, other: &Self) -> Vec<(&'static str, PrefValue)> {
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let mut changes = vec![];
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#comparisons
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changes
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}
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}
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}
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}
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