Changelog

version 0.4.0 – August 09 2013

Warning: this release has some breaking changes. If you the old selector expression syntax (eg. Bootstrap 2.3) then it’s recommended to use 0.3.9.

Add support for ; as argument delimiter
Add support for passing arguments by name to mixin
Remove old selector expression syntax ("hello")
Remove ability to skip arguments by repeating delimiter
Add built in functions: sin, cos, tan, asin, acos, atan, pow, pi, mod, sqrt, extract
Fix bug where @arguments was not getting values from ...
Selector interpolation works inside of brackets in selector
Fix bug when resolving mixin that has same name as enclosing class
Duplicate properties are now removed from output

Fixes compile issue with latest version of bootstrap
Support nested interpolations
Support interpolations inside of selectors
Variables can be inside of a @media declaration — Matt Labrum
transparent is recognized as a color — Nikolay Yordanov
Add unit, red, green, blue, constrast functions — Lucas Green, Peter Knight, kaystrobach

Overhauled PHP API. See documentation. The old interface is still available, just deprecated and no longer documented.
Performance optimizations, 25% speed up on average.
Imports can be inside of mixins.
Import urls can contain expressions.
Various bug fixes.

Added support for @media bubbling, you can now nest media blocks anywhere, and inside of each other.
Added a option to enable the preservation of /**/ comments. setPreserveComments
Changed default output formatter to match lessjs
Change internal structure of numbers and strings, you will have to update your registered functions.
Disabled color compression, fixed a bug in sorting of properties that prevent your from overwriting same named properties.
Fixed alpha(opacity=) bug. Better support for IE style colors in filter() values.
Better fallback for expressions that can’t be evaluated.
Misc bug fixes, enhanced test coverage significantly (now using travisci)

Importing done before evaluating to allow referencing mixins imported from other files before they are defined.
Fixed spin function to wrap hue around 0-360
Resulting unit of math expressions matches less.js in all cases
Division operator handled more like less.js (using property name, see division section of Expressions)
Mixins look up variables in their lexical scope when being mixed (instead of the target scope)
Expressions in variables evaluated in referenced scope instead of declared scope
Infinite loop detection for new evaluation model
Improved error messages for compile time errors
Expressions can be placed in @media queries
Default arguments appear in @arguments
Tweaked output of color functions to match less.js
Misc Bug fixes

New extension function interface without subclassing
Support for @arguments special variable
Added built in functions alpha, fade, mix, percentage
Color keywords are translated to their rgb version when used in expressions and functions
Misc bug fixes

reimplemented core parsing techniques, 50% speed up
all css selectors should be functional
support for @charset @font-face
& operator for nesting chained blocks
! operator for inserting important property
exposed function api: http://github.com/leafo/lessphp/commit/2fb4296a6a7287ea53e99b73858bfd5a44834cad
much better number, color, and string parsing support

rewrote command line tool, plessc, with more logical argument parsing and proper exit codes
separate blocks of the same name will now merge instead of overwriting each over
fixed a bug with any type of mixin not searching outside the scope
updated this webpage

blocks that start with @ are treated as abstract blocks and are not printed out
all blocks/mixins can now take argument lists (with default args) and be treated as functions
fixed bug with nested blocks inside of a mixin printing the name of the mixin
added the ability to specify import directory for @import
the correct import directory is figured out automatically when you compile from file path
fixed bug with @import and comments in imported file

setting variables to themselves in equations works how you expect
parentheses are supported in arithmetic
all variables and arithmetic do lazy evaluation, variables are set to the equation and not the value
code no longer throws php notices

Performance enhancements (50% faster compile for average case)
Accepts more native css properties and values (still some trouble with more advanced css3 stuff)
Better string support in general
Comments will no longer be interpreted from within strings