@visactor/vchart/esm/core/expression-function.js

charts lib based @visactor/VGrammar

export class ExpressionFunction {
    static instance() {
        return ExpressionFunction.instance_ || (ExpressionFunction.instance_ = new ExpressionFunction), 
        ExpressionFunction.instance_;
    }
    constructor() {
        this.functions = {};
    }
    registerFunction(name, fun) {
        name && fun && (this.functions[name] = fun);
    }
    unregisterFunction(name) {
        name && delete this.functions[name];
    }
    getFunction(name) {
        return this.functions[name] || null;
    }
    getFunctionNameList() {
        return Object.keys(this.functions);
    }
}
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