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package bjc.utils.ioutils.format.directives;
import bjc.esodata.*;
import bjc.utils.ioutils.format.*;
/**
* Implement the * directive.
*
* @author student
*
*/
public class GotoDirective implements Directive {
@Override
public Edict compile(CompileContext compCTX) {
CLParameters params = compCTX.decr.parameters;
CLModifiers mods = compCTX.decr.modifiers;
CLValue numVal = CLValue.nil();
GotoEdict.Mode mode;
if (mods.colonMod) {
mode = GotoEdict.Mode.BACKWARD;
if (params.length() >= 1) {
params.mapIndices("numargs");
numVal = params.resolveKey("numargs");
}
} else if (mods.atMod) {
mode = GotoEdict.Mode.INDEX;
if (params.length() >= 1) {
params.mapIndices("argidx");
numVal = params.resolveKey("argidx");
}
} else {
mode = GotoEdict.Mode.FORWARD;
if (params.length() >= 1) {
params.mapIndices("numargs");
numVal = params.resolveKey("numargs");
}
}
return new GotoEdict(mode, numVal);
}
}
class GotoEdict implements Edict {
public static enum Mode {
FORWARD, BACKWARD, INDEX
}
private Mode mode;
private CLValue numVal;
public GotoEdict(Mode mode, CLValue numVal) {
this.mode = mode;
this.numVal = numVal;
}
@Override
public void format(FormatContext formCTX) {
Tape<Object> items = formCTX.items;
int num;
switch (mode) {
case FORWARD:
num = numVal.asInt(items, "number of arguments forward", "*", 1);
items.right(num);
break;
case BACKWARD:
num = numVal.asInt(items, "number of arguments backward", "*", 1);
items.left(num);
break;
case INDEX:
num = numVal.asInt(items, "argument index", "*", 0);
items.seekTo(num);
break;
default:
throw new IllegalArgumentException("Unsupported goto mode " + mode);
}
}
}
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