[1.0.0-beta2] Add font/codepoint icon extractor

It is hard and heavy to extract icons from a proper font file (woff, ttf...).

Yes, but codepoints files are a mess -sometimes CSV, sometimes JSON, sometimes XML... no standardized structure) and not always available.

Maybe it is possible to extract the icon list using a lib (or a subset of a lib to avoid a dependency) like https://github.com/dompdf/php-font-lib

If we focus on only WOFF 2 for now, because all DS seems to propose this format, it may be simpler:

• Bootstrap 5: bootstrap-icons.woff & bootstrap-icons.woff2
• Font awesome: fa-brands-400.ttf fa-regular-400.woff2 fa-v4compatibility.ttf fa-brands-400.woff2 fa-solid-900.ttf fa v4compatibility.woff2 fa-regular-400.ttf fa-solid-900.woff2
• Feather: ???
• Material Symbols: https://fonts.gstatic.com/s/materialsymbolsoutlined/v207/{hash}.woff2

I have added a first draft of Woff2Extractor, inspired from https://github.com/teicee/php-woff-converter

https://git.drupalcode.org/project/ui_icons/-/merge_requests/20

What do you think?

So sorry, https://github.com/teicee/php-woff-converter was loading woff1 files, not woff2 files.

If we continue with Woff1, we an test with Bootstrap 5 & also Icomoon

Ok, we start with Woff1

but once Woff2 is ready, replace Material symbols example SVG icon pack by a Woff2 one, and add Material icons

So, Woff is a wrapper around TrueType, OpenType, and Open Font Format.

So let's start with a TTF extractor and test with FontAwesome which has a TrueType version: https://fontawesome.com/v6/download

Once this one works, we can add an interface:

interface FontIconExtractorInterface extends IconExtractorInterface {

  public function parseTable(array $table): array;

}

So, Woff1Extractor::discoverIcons() can call TtfExtractor::parseTable() once the wrapper is scanned and the glyph table discovered.

I would prefer to not include classes to maintain for ttf/woff support when there is tested library like dompdf/php-font-lib.

The font Extractor should include metadata alternatives to discover icons with json, codepoints and yml:

• Bootstrap icons font: woff file and/or bootstrap.json
• Font Awesome: TTF file and/or metadata icons.json or better icons.yml (included with FontAwesome for the web)
• Feather: json file generated in npm package
• Material: codepoints file included with font, CDN font to load css matching doc, see variablefon

I will push a proposition of font extractor that support ttf/woff with dompdf/php-font-lib and json/codepoints/yml definition files.

We can do a ui_icons_fonts sub-module, and move it to the drupal/ui_icons_fonts module before tagging the first RC