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package bjc.dicelang.v2;
import bjc.utils.funcdata.FunctionalList;
import bjc.utils.funcdata.IList;
import bjc.utils.esodata.SingleTape;
import bjc.utils.esodata.Tape;
public class StreamEngine {
private DiceLangEngine eng;
private Tape<IList<String>> streams;
private IList<String> currStream;
public StreamEngine(DiceLangEngine engine) {
eng = engine;
}
private void init() {
streams = new SingleTape<>();
currStream = new FunctionalList<>();
streams.insertBefore(currStream);
}
public boolean doStreams(String[] toks, IList<String> dest) {
init();
for(String tk : toks) {
if(tk.startsWith("{@S")) {
if(!processCommand(tk)) return false;
} else {
currStream.add(tk);
}
}
for(String tk : currStream) {
dest.add(tk);
}
return true;
}
private boolean processCommand(String tk) {
char[] comms = null;
if(tk.length() > 5) {
comms = tk.substring(3, tk.length() - 1).toCharArray();
} else {
comms = new char[1];
comms[0] = tk.charAt(3);
}
for(char comm : comms) {
switch(comm) {
case '+':
streams.insertAfter(new FunctionalList<>());
break;
case '>':
if(!streams.right()) {
System.out.println("\tERROR: Attempted to switch to non-existent stream");
return false;
}
currStream = streams.item();
break;
case '<':
if(!streams.left()) {
System.out.println("\tERROR: Attempted to switch to non-existent stream");
return false;
}
currStream = streams.item();
break;
case '-':
if(streams.size() == 1) {
System.out.println("\tERROR: Cannot delete last stream");
return false;
} else {
streams.remove();
currStream = streams.item();
}
break;
default:
System.out.println("\tERROR: Unknown stream control command: " + tk);
return false;
}
}
return true;
}
}
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