This is a lexer bringing the language Eiffel to Pygments. Pygments is a Python library for syntax highlighting of a wide variety of programming languages. For Pygments to know how to highlight which part of a piece of code, it relies on special files to analyze the code structure: a lexer. So this is a lexer for Eiffel, making it usable with Pygments syntax highlighting.
For more information on Pygments have a look at http://pygments.org/
For you to use the eiffel lexer, you have to add it to your Pygments installation. For doing so have a look at http://pygments.org/docs/lexerdevelopment/#adding-and-testing-a-new-lexer
When the lexer has been added, Pygments will do the rest.
Have fun using it! Please be aware this lexer is a very basic implementation based on regular expressions and my limited knowledge of the language Eiffel. So if you have anything to improve make sure to contribute to this project.