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A C implementation of a Sass compiler

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Libsass

by Aaron Leung and Hampton Catlin (@hcatlin)

Build Status

http://github.com/hcatlin/libsass

Libsass is just a library, but if you want to RUN libsass, then go to http://github.com/hcatlin/sassc or http://github.com/hcatlin/sassruby or find your local implementer.

About

Libsass is a C/C++ port of the Sass CSS precompiler. The original version was written in Ruby, but this version is meant for efficiency and portability.

This library strives to be light, simple, and easy to build and integrate with a variety of platforms and languages.

Developing

As you may have noticed, the libsass repo itself has no executables and no tests. Oh noes! How can you develop???

Well, luckily, SassC is the official binary wrapper for libsass and is always kept in sync. SassC uses a git submodule to include libsass. When developing libsass, its best to actually check out SassC and develop in that directory with the SassC spec and tests there.

We even run Travis tests for SassC!

Tests

Since libsass is a pure library, tests are run through the http://github.com/hcatlin/sass-spec project using the http://github.com/hcatlin/sasc driver.

To run tests against libsass while developing, please ensure you have the latest version of the above projects cloned, and then define the following environment variables:

export SASS_SPEC_PATH=/path/sass-spec export SASS_SASSC_PATH=/path/sassc export SASS_LIBSASS_PATH=~/path/libsass

Obviously, update them to your local environment. Then, its just a matter of running...

make test

Usage

While libsass is primarily implemented in C++, it provides a simple C interface that is defined in [sass_inteface.h]. Its usage is pretty straight forward.

First, you create a sass context struct. We use these objects to define different execution parameters for the library. There are three different context types.

sass_context        // string-in-string-out compilation
sass_file_context   // file-based compilation
sass_folder_context // full-folder multi-file 

Each of the context's have slightly different behavior and are implemented seperately. This does add extra work to implementing a wrapper library, but we felt that a mixed-use context object provides for too much implicit logic. What if you set "input_string" AND "input_file"... what do we do? This would introduce bugs into wrapper libraries that would be difficult to debug.

We anticipate that most adapters in most languages will define their own logic for how to separate these use cases based on the language. For instance, the original Ruby interface has a combined interface, but is backed by three different processes.

To generate a context, use one of the following methods.

sass_new_context()
sass_new_file_context()
sass_new_folder_context()

Again, please see the sass_interface.h for more information.

And, to get even more information, then please see the implementations in SassC and SassC-Ruby.

About Sass

Sass is a CSS pre-processor language to add on exciting, new, awesome features to CSS. Sass was the first language of its kind and by far the most mature and up to date codebase.

Sass was originally created by the co-creator of this library, Hampton Catlin (@hcatlin). The extension and continuing evolution of the language has all been the result of years of work by Nathan Weizenbaum (@nex3) and Chris Eppstein (@chriseppstein).

For more information about Sass itself, please visit http://sass-lang.com

Contribution Agreement

Any contribution to the project are seen as copyright assigned to Hampton Catlin, a human on the planet earth. Your contribution warrants that you have the right to assign copyright on your work. The intention here is to ensure that the project remains totally free (liberal, like).

Our MIT license is designed to be as simple, and liberal as possible.

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A C implementation of a Sass compiler

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