servo/components/script/dom/console.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 http://mozilla.org/MPL/2.0/. */

use devtools_traits::{ConsoleMessage, LogLevel, ScriptToDevtoolsControlMsg};
use dom::bindings::global::GlobalRef;
use dom::bindings::str::DOMString;

// https://developer.mozilla.org/en-US/docs/Web/API/Console
pub struct Console(());

impl Console {
    fn send_to_devtools(global: GlobalRef, level: LogLevel, message: DOMString) {
        if let Some(chan) = global.as_global_scope().devtools_chan() {
            let console_message = prepare_message(level, message);
            let worker_id = if let GlobalRef::Worker(worker) = global {
                Some(worker.get_worker_id())
            } else {
                None
            };
            let devtools_message = ScriptToDevtoolsControlMsg::ConsoleAPI(
                global.pipeline_id(),
                console_message,
                worker_id);
            chan.send(devtools_message).unwrap();
        }
    }
}

impl Console {
    // https://developer.mozilla.org/en-US/docs/Web/API/Console/log
    pub fn Log(global: GlobalRef, messages: Vec<DOMString>) {
        for message in messages {
            println!("{}", message);
            Self::send_to_devtools(global, LogLevel::Log, message);
        }
    }

    // https://developer.mozilla.org/en-US/docs/Web/API/Console
    pub fn Debug(global: GlobalRef, messages: Vec<DOMString>) {
        for message in messages {
            println!("{}", message);
            Self::send_to_devtools(global, LogLevel::Debug, message);
        }
    }

    // https://developer.mozilla.org/en-US/docs/Web/API/Console/info
    pub fn Info(global: GlobalRef, messages: Vec<DOMString>) {
        for message in messages {
            println!("{}", message);
            Self::send_to_devtools(global, LogLevel::Info, message);
        }
    }

    // https://developer.mozilla.org/en-US/docs/Web/API/Console/warn
    pub fn Warn(global: GlobalRef, messages: Vec<DOMString>) {
        for message in messages {
            println!("{}", message);
            Self::send_to_devtools(global, LogLevel::Warn, message);
        }
    }

    // https://developer.mozilla.org/en-US/docs/Web/API/Console/error
    pub fn Error(global: GlobalRef, messages: Vec<DOMString>) {
        for message in messages {
            println!("{}", message);
            Self::send_to_devtools(global, LogLevel::Error, message);
        }
    }

    // https://developer.mozilla.org/en-US/docs/Web/API/Console/assert
    pub fn Assert(global: GlobalRef, condition: bool, message: Option<DOMString>) {
        if !condition {
            let message = message.unwrap_or_else(|| DOMString::from("no message"));
            println!("Assertion failed: {}", message);
            Self::send_to_devtools(global, LogLevel::Error, message);
        }
    }

    // https://developer.mozilla.org/en-US/docs/Web/API/Console/time
    pub fn Time(global: GlobalRef, label: DOMString) {
        if let Ok(()) = global.as_global_scope().time(label.clone()) {
            let message = DOMString::from(format!("{}: timer started", label));
            println!("{}", message);
            Self::send_to_devtools(global, LogLevel::Log, message);
        }
    }

    // https://developer.mozilla.org/en-US/docs/Web/API/Console/timeEnd
    pub fn TimeEnd(global: GlobalRef, label: DOMString) {
        if let Ok(delta) = global.as_global_scope().time_end(&label) {
            let message = DOMString::from(
                format!("{}: {}ms", label, delta)
            );
            println!("{}", message);
            Self::send_to_devtools(global, LogLevel::Log, message);
        };
    }
}

fn prepare_message(log_level: LogLevel, message: DOMString) -> ConsoleMessage {
    // TODO: Sending fake values for filename, lineNumber and columnNumber in LogMessage; adjust later
    ConsoleMessage {
        message: String::from(message),
        logLevel: log_level,
        filename: "test".to_owned(),
        lineNumber: 1,
        columnNumber: 1,
    }
}