Function parseBlock

docs/app/js/sanddance-app.js:147018–147030

(block, marktype, params, scope)

    return params;
}
function parseBlock(block, marktype, params, scope) {
    const channels = {}, fields = {};
    for(const name in block)if (block[name] != null) // skip any null entries
    channels[name] = parse$1(expr(block[name]), scope, params, fields);
    return {
        $expr: {
            marktype,
            channels
        },
        $fields: Object.keys(fields),
        $output: Object.keys(block)
    };
}
function expr(enc) {
    return (0, _vegaUtil.isArray)(enc) ? rule(enc) : entry$1(enc);
}