servo/components/devtools/actors/inspector/css_properties.rs

/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at https://mozilla.org/MPL/2.0/. */

//! This actor holds a database of available css properties, their supported values and
//! alternative names

use std::collections::HashMap;

use devtools_traits::CssDatabaseProperty;
use malloc_size_of_derive::MallocSizeOf;
use serde::Serialize;
use serde_json::{Map, Value};

use crate::StreamId;
use crate::actor::{Actor, ActorError, ActorRegistry};
use crate::protocol::ClientRequest;

#[derive(MallocSizeOf)]
pub(crate) struct CssPropertiesActor {
    name: String,
    properties: HashMap<String, CssDatabaseProperty>,
}

#[derive(Serialize)]
struct GetCssDatabaseReply<'a> {
    from: String,
    properties: &'a HashMap<String, CssDatabaseProperty>,
}

impl Actor for CssPropertiesActor {
    fn name(&self) -> String {
        self.name.clone()
    }

    /// The css properties actor can handle the following messages:
    ///
    /// - `getCSSDatabase`: Returns a big list of every supported css property so that the
    ///   inspector can show the available options
    fn handle_message(
        &self,
        request: ClientRequest,
        _registry: &ActorRegistry,
        msg_type: &str,
        _msg: &Map<String, Value>,
        _id: StreamId,
    ) -> Result<(), ActorError> {
        match msg_type {
            "getCSSDatabase" => request.reply_final(&GetCssDatabaseReply {
                from: self.name(),
                properties: &self.properties,
            })?,
            _ => return Err(ActorError::UnrecognizedPacketType),
        };
        Ok(())
    }
}

impl CssPropertiesActor {
    pub fn register(
        registry: &ActorRegistry,
        properties: HashMap<String, CssDatabaseProperty>,
    ) -> String {
        let name = registry.new_name::<Self>();
        let actor = Self {
            name: name.clone(),
            properties,
        };
        registry.register::<Self>(actor);
        name
    }
}