maplibre-gl/src/symbol/transform_text.ts

BSD licensed community fork of mapbox-gl, a WebGL interactive maps library

import {rtlWorkerPlugin} from '../source/rtl_text_plugin_worker.ts';
import {applyArabicShaping} from './arabic_shaping.ts';

import type {SymbolStyleLayer} from '../style/style_layer/symbol_style_layer.ts';
import type {Feature} from '@maplibre/maplibre-gl-style-spec';
import {type Formatted} from '@maplibre/maplibre-gl-style-spec';

function transformTextInternal(text: string, layer: SymbolStyleLayer, feature: Feature) {
    const transform = layer.layout.get('text-transform').evaluate(feature, {});
    if (transform === 'uppercase') {
        text = text.toLocaleUpperCase();
    } else if (transform === 'lowercase') {
        text = text.toLocaleLowerCase();
    }

    return (rtlWorkerPlugin.applyArabicShaping ?? applyArabicShaping)(text);
}

export function transformText(text: Formatted, layer: SymbolStyleLayer, feature: Feature): Formatted {
    for (const section of text.sections) {
        section.text = transformTextInternal(section.text, layer, feature);
    }
    return text;
}