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A C/C++ implementation of a Sass compiler
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b64 Code: Fixes VC warnings.
m4 Use autoreconf -i and add gitkeep to m4 to make automake happy
posix Add project files for Visual Studio Community 2013
res Fix build for mingw and dll linking
script Clean up and improve autotools build
support Switch to the new organization URLs.
test JMA - Moved node tests into test folder. Deleted extraneous Libsass T…
utf8 Replaces native utf8 handling with UTF8-CPP library
win Implement all output styles
.editorconfig Fix EditorConfig Makefile selector
.gitattributes Add gitattributes for line ending normalization
.gitignore Implement all output styles
.travis.yml Removes redundant builds in travis-ci config
COPYING Move read me and license out of the source
INSTALL we dont follow those install rules
LICENSE Move read me and license out of the source
Makefile Implement all output styles Implement all output styles README: Updates compiler versions.
appveyor.yml CI: Improves AppVeyor build performance.
ast.cpp Implement all output styles
ast.hpp Fix bug introduced in #913
ast_def_macros.hpp Refactor header include guards
ast_factory.hpp Correctly bubble keyfrome directives
ast_fwd_decl.hpp Prepare for output refactoring
backtrace.hpp Refactor header include guards
base64vlq.cpp Revert "Merge pull request #236 from nschonni/move-to-src"
base64vlq.hpp Refactor header include guards
bind.cpp Prepare for output refactoring
bind.hpp Code: Fixes VC warnings.
cencode.c [BUGFIX] Add fix for source-maps (Fix-Up PR #591)
color_names.hpp Refactor header include guards Remove hard-coded version from autotools build
constants.cpp Add support for -ms-calc
constants.hpp Add support for -ms-calc
context.cpp Merge pull request #866 from alprs/fix_comments-stacktrace
context.hpp Implement all output styles
contextualize.cpp Implement all output styles
contextualize.hpp Implement all output styles
copy_c_str.cpp Revert "Merge pull request #236 from nschonni/move-to-src"
copy_c_str.hpp Refactor header include guards
cssize.cpp Implement all output styles
cssize.hpp Implement all output styles
debug.hpp Refactor header include guards
debugger.hpp Implement all output styles
emitter.cpp Implement all output styles
emitter.hpp Implement all output styles
environment.hpp Refactor header include guards
error_handling.cpp Improve parsing of quoted string with interpolations
error_handling.hpp Refactor header include guards
eval.cpp Implement all output styles
eval.hpp Implement all output styles
expand.cpp Implement all output styles
expand.hpp Implement all output styles
extconf.rb Restructuring the library to work as a more
extend.cpp Implement all output styles
extend.hpp Code: Fixes VC warnings.
file.cpp Pass "keep comments" flag to improve error message line numbers
file.hpp Code: Fixes VC warnings.
functions.cpp Code: Fixes VC warnings.
functions.hpp Code: Fixes VC warnings.
inspect.cpp Code: Fixes VC warnings.
inspect.hpp Implement all output styles
json.cpp Windows: Add guard for snprintf.
json.hpp Adds json library by Joseph A. Adams
kwd_arg_macros.hpp Refactor header include guards
libsass.spec Add RPM spec file
mapping.hpp Refactor header include guards
memory_manager.hpp Refactor header include guards
node.cpp Fix DEBUG compile mode
node.hpp Fix DEBUG compile mode
operation.hpp Correctly bubble keyfrome directives
output.cpp Implement all output styles
output.hpp Implement all output styles
parser.cpp Code: Fixes VC warnings.
parser.hpp Implement all output styles
paths.hpp Refactor header include guards
position.cpp Implement all output styles
position.hpp Implement all output styles
prelexer.cpp Implement all output styles
prelexer.hpp Implement all output styles
remove_placeholders.cpp Implement improved source-mapping
remove_placeholders.hpp Code: Fixes VC warnings.
sass.cpp Implement all output styles
sass.h Prepare for output refactoring
sass2scss.cpp Add @charset support to sass2scss
sass2scss.h Refactor header include guards
sass_context.cpp Code: Fixes VC warnings.
sass_context.h Remove the non-standard image-url function
sass_functions.cpp Code: Fixes VC warnings.
sass_functions.h Refactor header include guards
sass_interface.cpp Code: Fixes VC warnings.
sass_interface.h Remove the non-standard image-url function
sass_util.cpp Prepare for output refactoring
sass_util.hpp Refactor header include guards
sass_values.cpp Code: Fixes VC warnings.
sass_values.h Correct typo in comment
source_map.cpp Implement all output styles
source_map.hpp Code: Fixes VC warnings.
subset_map.hpp Prepare for output refactoring
to_c.cpp Refactor C Interface to hide implementation details
to_c.hpp Refactor header include guards
to_string.cpp Implement all output styles
to_string.hpp Code: Fixes VC warnings.
units.cpp Implement all output styles
units.hpp Implement all output styles
utf8.h Replaces native utf8 handling with UTF8-CPP library
utf8_string.cpp Refactor header include guards
utf8_string.hpp Refactor header include guards
util.cpp Implement all output styles
util.hpp Implement all output styles Remove hard-coded version from autotools build


by Aaron Leung (@akhleung) and Hampton Catlin (@hcatlin)

Linux CI Windows CI Bountysource Coverage Status

Libsass is just a library, but if you want to RUN libsass, then go to or or find your local implementer.

LibSass requires GCC 4.6+ or Clang/LLVM. If your OS is older, this version may not compile.

On Windows, you need MinGW with GCC 4.6+ or VS 2013 Update 4+. It is also possible to build LibSass with Clang/LLVM on Windows.


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.


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!


Since libsass is a pure library, tests are run through the SassSpec project using the SassC driver.

To run tests against libsass while developing, you can run ./script/spec. This will clone SassC and Sass-Spec under the project folder and then run the Sass-Spec test suite. You may want to update the clones to ensure you have the latest version.

Library Usage

While libsass is a library primarily written in C++, it provides a simple C interface which should be used by most implementers. Libsass does not do much on its own without an implementer. This can be a command line tool, like sassc or a binding to your favorite programing language.

If you want to build or interface with libsass, we recommend to check out the wiki pages about building libsass and the C-API documentation.

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 Natalie Weizenbaum (@nex3) and Chris Eppstein (@chriseppstein).

For more information about Sass itself, please visit

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.

sass2scss was originally written by Marcel Greter [@mgreter] and he happily agreed to have it merged into the project.

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