CSC/ECE 517 Fall 2015/oss M1501 GSN

To Report CSS errors to the devtools, both stored and live. CSS errors are reported to the Firefox developer tools in this project.

Important Notes

A few important notes to help the reviewer:

• Tests are not applicable to this project.
• Ruby style guide is not applicable to this project.
• Edge cases are not applicable to this project.
• There is no UI testing applicable to this project.
• The work that we have done is exactly as per the initial steps provided by the Mozilla team.

Introduction

Servo<ref>https://en.wikipedia.org/wiki/Servo_(layout_engine)</ref> is an experimental web browser layout engine. It is developed by Mozilla and written in Rust.It provides an API for hosting the engine within other software. The Servo browser currently provides developer tools to inspect DOM, execute JavaScript remotely.

Rust

Rust<ref>https://en.wikipedia.org/wiki/Rust_(programming_language)</ref> is a programming language developed by Mozilla. It is used to design concurrent and safe systems.

Environment Setup<ref>https://github.com/servo/servo</ref>

Pre-requisites

On Debian-based Linuxes:

sudo apt-get install curl freeglut3-dev\
    libfreetype6-dev libgl1-mesa-dri libglib2.0-dev xorg-dev \
    gperf g++ cmake python-virtualenv python-pip \
    libssl-dev libbz2-dev libosmesa6-dev libxmu6 libxmu-dev libglu1-mesa-dev

On Fedora:

sudo dnf install curl freeglut-devel libtool gcc-c++ libXi-devel \
    freetype-devel mesa-libGL-devel glib2-devel libX11-devel libXrandr-devel gperf \
    fontconfig-devel cabextract ttmkfdir python python-virtualenv python-pip expat-devel \
    rpm-build openssl-devel cmake bzip2-devel libXcursor-devel libXmu-devel mesa-libOSMesa

Cloning servo

git clone https://github.com/servo/servo

Building Servo

cd servo
./mach build --dev
./mach run tests/html/about-mozilla.html

Project Description<ref>https://github.com/servo/servo/wiki/CSS-parse-error-reporting</ref>

We will be adding the capability of exposing CSS errors to Servo. We will be using Firefox remote developer tools to inspect and debug the code in Servo.

Program Flow

• Ensure that Servo can compile and run the given tests.
• Choose a website that is compatible with Servo and attach the remote developer tools to it.

Initial steps

• Build Servo
• Attach remote developer tools
• Making initial changes and build Servo
• Generate CSS error messages
• Process error messages and retrieve cached messages
• Integrate and build again

Subsequent steps

• Generate messages which communicate the errors to the script thread.
• Process the messages and provide support for caching them and sending them to the devtools server if it exists.
• Provide the functionality to retrieve the cached CSS error messages whenever requested.

Design Pattern Used

Model view controller design pattern and Interpreter design pattern is used in this project.

References

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