Class: Fontisan::Audit::Extractors::OpenTypeLayout

Inherits:
Base
  • Object
show all
Defined in:
lib/fontisan/audit/extractors/opentype_layout.rb

Overview

OpenType layout summary: union of GSUB + GPOS scripts and features, plus a per-script breakdown preserving which feature belongs to which script under which table.

Returned fields:

opentype_layout: Models::Audit::OpenTypeLayout, or nil for
               Type 1

Owned here (MECE split from Aggregations, which is UCD-only).

Instance Method Summary collapse

Instance Method Details

#extract(context) ⇒ Object 



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# File 'lib/fontisan/audit/extractors/opentype_layout.rb', line 16

def extract(context)
  font = context.font
  return { opentype_layout: nil } unless sfnt?(font)

  gsub_scripts = scripts_in(font, Constants::GSUB_TAG)
  gpos_scripts = scripts_in(font, Constants::GPOS_TAG)
  all_scripts = (gsub_scripts + gpos_scripts).uniq.sort

  by_script = all_scripts.map do |tag|
    Models::Audit::ScriptFeatures.new(
      script: tag,
      gsub_features: features_for(font, Constants::GSUB_TAG, tag),
      gpos_features: features_for(font, Constants::GPOS_TAG, tag),
    )
  end

  { opentype_layout: Models::Audit::OpenTypeLayout.new(
    scripts: all_scripts,
    features: aggregate_features(by_script),
    by_script: by_script,
    has_gsub: font.has_table?(Constants::GSUB_TAG),
    has_gpos: font.has_table?(Constants::GPOS_TAG),
  ) }
end