Function getExpression

docs/app/js/sanddance-app.js:146536–146541

* Resolve an expression reference.

(_, ctx, params)

/**
 * Resolve an expression reference.
 */ function getExpression(_, ctx, params) {
    if (_.$params) // parse expression parameters
    ctx.parseParameters(_.$params, params);
    const k = "e:" + _.$expr.code + "_" + _.$name;
    return ctx.fn[k] || (ctx.fn[k] = (0, _vegaUtil.accessor)(ctx.parameterExpression(_.$expr), _.$fields, _.$name));
}
/**
 * Resolve a key accessor reference.
 */ function getKey(_, ctx) {