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import * as AATFeatureMap from './AATFeatureMap';
import * as Script from '../layout/Script';
import AATMorxProcessor from './AATMorxProcessor';
export default class AATLayoutEngine {
constructor(font) {
this.font = font;
this.morxProcessor = new AATMorxProcessor(font);
this.fallbackPosition = false;
}
substitute(glyphRun) {
// AAT expects the glyphs to be in visual order prior to morx processing,
// so reverse the glyphs if the script is right-to-left.
if (glyphRun.direction === 'rtl') {
glyphRun.glyphs.reverse();
}
this.morxProcessor.process(glyphRun.glyphs, AATFeatureMap.mapOTToAAT(glyphRun.features));
}
getAvailableFeatures(script, language) {
return AATFeatureMap.mapAATToOT(this.morxProcessor.getSupportedFeatures());
}
stringsForGlyph(gid) {
let glyphStrings = this.morxProcessor.generateInputs(gid);
let result = new Set;
for (let glyphs of glyphStrings) {
this._addStrings(glyphs, 0, result, '');
}
return result;
}
_addStrings(glyphs, index, strings, string) {
let codePoints = this.font._cmapProcessor.codePointsForGlyph(glyphs[index]);
for (let codePoint of codePoints) {
let s = string + String.fromCodePoint(codePoint);
if (index < glyphs.length - 1) {
this._addStrings(glyphs, index + 1, strings, s);
} else {
strings.add(s);
}
}
}
}