@benedictstrube/ui-mapbox/expression/expression-parser.ios.js

Interactive, thoroughly customizable maps powered by vector tiles and OpenGL.

export class ExpressionParser {
    static parseJson(json) {
        const filterStr = NSString.stringWithString(JSON.stringify(json));
        const filterData = filterStr.dataUsingEncoding(NSUTF8StringEncoding);
        const filterJson = NSJSONSerialization.JSONObjectWithDataOptionsError(filterData, 1);
        const predicateFilter = NSPredicate.predicateWithMGLJSONObject(filterJson);
        return predicateFilter;
    }
    static toJson(filter) {
        if (!filter) {
            return null;
        }
        if (!(filter instanceof NSPredicate)) {
            throw new Error('Filter must be a NSPredicate.');
        }
        const expressionObj = filter.mgl_jsonExpressionObject;
        const data = NSJSONSerialization.dataWithJSONObjectOptionsError(expressionObj, 0);
        const expression = NSString.alloc().initWithDataEncoding(data, NSUTF8StringEncoding);
        return JSON.parse(expression);
    }
}
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