getLigatures top-level property

List Function(dynamic feature, dynamic script, dynamic language) getLigatures

Implementation

Substitution.prototype.getLigatures = function(feature, script, language) {
    const ligatures = [];
    const lookupTables = this.getLookupTables(script, language, feature, 4);
    for (let idx = 0; idx < lookupTables.length; idx++) {
        const subtables = lookupTables[idx].subtables;
        for (let i = 0; i < subtables.length; i++) {
            const subtable = subtables[i];
            const glyphs = this.expandCoverage(subtable.coverage);
            const ligatureSets = subtable.ligatureSets;
            for (let j = 0; j < glyphs.length; j++) {
                const startGlyph = glyphs[j];
                const ligSet = ligatureSets[j];
                for (let k = 0; k < ligSet.length; k++) {
                    const lig = ligSet[k];
                    ligatures.push({
                        sub: [startGlyph].concat(lig.components),
                        by: lig.ligGlyph
                    });
                }
            }
        }
    }
    return ligatures;
};