CSC/ECE 517 Fall 2016/M1653 Implement HTML form validation

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Implementation of HTML5 form validation in servo

Servo is a modern high performance web browser developed by Mozilla with Samsung porting it on android and arm processors. The source code is written in the rust programming language, which is a new developed system level programming language. The major advantage of rust language is that it is thread-safe<ref>https://www.rust-lang.org/en-US/</ref>. This project implements html form validation on servo browser.

Introduction

The HTML5is a markup language used for content organizing and showing on the World Wide Web<ref>https://en.wikipedia.org/wiki/HTML5</ref>. It defines set of specification which users needs to follow to make web pages HTML5 compliant. In HTML 5 there is a major type of element which is form element. When user trying to submit their form, the system should be able to check the validation status of this form and decide whether accept this form or reject the request. HTML provides such mechanism. Using this mechanism will allow the system to check whether the contents of forms are validated before it is allowed to submit. Servo currently implements validation check for some of the form element types. The objective of this project is to define and implement validation check function and implement validate step for these HTML5 form elements.

Servo

Servo is an open source prototype web browser layout engine that is being developed by Mozilla Research. Its source code can be found here. Current browser engines are mostly based on single-threaded model. Motivation behind building servo web browser is to build a highly parallel and reliable environment, where different components (such as rendering, layout, HTML parsing, image decoding, etc.) can be handled by fine-grained, isolated tasks.

Rust

Rust is an open source systems programming language developed by Mozilla. Rust is a language suited for creating a highly concurrent and safe systems. In performance and syntax, rust is similar to C++ but semantically it is very different. Rust emphasis is on speed, safety and control of memory layout.

Project Description

  • The project begin with installing and compiling the servo browser. For different Operating systems the dependencies are different. We installed it on Ubuntu 14.04 using the following commands.


On Debian-based Linuxes: 

   sudo apt-get install curl freeglut3-dev \
   libfreetype6-dev libgl1-mesa-dri libglib2.0-dev xorg-dev \
   msttcorefonts gperf g++ cmake python-virtualenv \
   libssl-dev libglfw-dev
  • We then forked the repository and cloned it on our computers and then compiled and ran the servo browser.
   git clone https://github.com/servo/servo
   cd servo
   ./mach build --dev
   ./mach run tests/html/about-mozilla.html
  • While building the servo as shown above we were getting GLSL 1.50 is not supported error. We investigated this issue and found that there was an open issue 13515. We found that the error was because the rendering was done with Nvidia graphics card and so we changed it to the intel graphics card by ./mach run tests/html/about-mozilla.html -c and were able to run the browser. We even updated the open thread so that other people can take advantage of that.


Design Patterns & OO Practices

We were not supposed to change the design apart from adding a new behaviour/ability for HTML Element. We tried to follow good OO practices throughout the development process. We always tried to follow the DRY principle in order to avoid repetition of code. Servo has it's own coding standards which are checked by running following command.

./mach test-tidy

Using the above code there were a few issues generated and we have fixed all the issues.

References

<references /> 1. https://doc.rust-lang.org/stable/book/
2. https://en.wikipedia.org/wiki/Rust_(programming_language)
3. https://en.wikipedia.org/wiki/Servo_(layout_engine)
4. https://github.com/servo/servo/wiki/Form-validation-student-project
5. https://doc.rust-lang.org/book/
6. http://wiki.expertiza.ncsu.edu/index.php/CSC/ECE_517_Spring_2016/Mozilla_Implement_HTML5_form_validation

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