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package org.rosuda.REngine;
/** interface defining delegate methods used by {@link REngine} to forward input callbacks from R. */
public interface REngineInputInterface {
/** called when R enters the read stage of the event loop.
* <p> Important: implementations should never use a direct return! That will cause a tigh-spinning event loop. Implementation must wait for input asynchronously (e.g., declare synchonized RReadConsole and use wait()) and return only when a complete line is available for processing.
* @param eng calling engine
* @param prompt prompt to display in the console
* @param addToHistory flag indicating whether the input is transient (<code>false</code>) or to be recorded in the command history (<code>true</code>).
* @return string to be processed as console input
*/
public String RReadConsole(REngine eng, String prompt, int addToHistory);
}
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