Struct FeatureBuilder

pub struct FeatureBuilder<'a> { /* private fields */ }

A structure that allows client code to add additional features to the compilation.

Implementations

impl<'a> FeatureBuilder<'a>

pub fn language_systems(&self) -> impl Iterator<Item = LanguageSystem> + 'a

An iterator over the default language systems registered in the FEA

pub fn gdef(&self) -> Option<&GdefBuilder>

If the FEA text contained an explicit GDEF table block, return its contents

pub fn add_lig_carets( &mut self, lig_carets: BTreeMap<GlyphId16, Vec<CaretValue>>, )

Add caret positions for the GDEF LigCaretList table

pub fn add_lookup<T: LookupSubtableBuilder>( &mut self, lookup: PendingLookup<T>, ) -> LookupId

Add a lookup to the lookup list.

The LookupId that is returned can then be included in features (i.e, passed to add_feature.)

pub fn add_to_default_language_systems( &mut self, feature_tag: Tag, lookups: &[LookupId], )

Add lookups to every default language system.

Convenience method for recurring pattern.

pub fn add_feature(&mut self, key: FeatureKey, lookups: Vec<LookupId>)

Create a new feature, registered for a particular language system.

The caller must call this method once for each language system under which a feature is to be registered.

pub fn add_feature_variations( &mut self, features: Vec<Tag>, conditions: Vec<(ConditionSet, Vec<LookupId>)>, )

Add feature variations.

The variations will be added to each feature in tags.

For each feature tag:

• if any FeatureRecords exist with that tag, the variations will be added to them.
• if none exist, a new feature will be registered for the default language systems, and the variations will be added to these features.