# FEZ — Font Engineering made eaZy
*I wear a fez now. Fezzes are cool.*
The FEZ language is implemented via a Python library, `fontFeatures`. This format improves over Adobe FEA (`.fea`) in several important ways, and compiles to FEA or to raw GPOS/GSUB binary tables.
## FEZ Quickstart
Class definition is a time consuming element of writing FEA code. FEZ allows regular expressions to be used to define classes; each glyph name in the font is tested against the regular expression, and the glyphs added:
```
DefineClass @sc = /\.sc$/;
```
Ran as:
```sh
fez2fea tests/LibertinusSans-Regular.otf test.fez
```
Results in:
```fea
@sc = [parenleft.sc parenright.sc bracketleft.sc bracketright.sc ...];
```
Simple replacement can be done as easily as:
```
DefineClass @sc = /\.sc$/;
DefineClass @sc_able = @sc~sc;
Feature smcp {
Substitute @sc_able -> @sc;
};
```
Quite complex classes can be built. All the glyphs which have a smallcap and alternate form:
```
DefineClass @sc_and_alt_able = /.*/ and hasglyph(/$/ .alt) and hasglyph(/$/ .sc);
```
Returning:
```fea
@sc_and_alt_able = [h y germandbls];
```
FEZ can even do substitutions impossible in FEA. For example:
```
DefineClass @digits = U+0031=>U+0039; # this is range(U+0031, U+0039) inclusive
DefineClass @encircled = U+2474=>U+247C;
# Un-CJK parenthesize
Feature ss01 {
Substitute @encircled -> parenleft @digits parenright;
};
```
Gives us:
```fea
feature ss01 {
lookup Routine_1 {
sub uni2474 by parenleft one parenright;
sub uni2475 by parenleft two parenright;
sub uni2476 by parenleft three parenright;
sub uni2477 by parenleft four parenright;
sub uni2478 by parenleft five parenright;
sub uni2479 by parenleft six parenright;
sub uni247A by parenleft seven parenright;
sub uni247B by parenleft eight parenright;
sub uni247C by parenleft nine parenright;
} Routine_1;
} ss01;
```
FEZ can do much more; see the [standard verbs documentation](https://fez.readthedocs.io/en/latest/syntax.html#standard-verbs) and the [optional plugins](https://fez.readthedocs.io/en/latest/optionalverbs.html). Writing your own plugins is as simple as [defining its grammar, verb, and adding a class with an `action()` method](https://fez.readthedocs.io/en/latest/plugins.html).
## Contributors
See the [CONTRIBUTORS.txt](CONTRIBUTORS.txt) file for the full list of contributors. Major contributions are described below:
* FEZ was originally written by Simon Cozens
* Fred Brennan contributed a new parser and documentation updates
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