org.snapscript.tree.YieldStatement Maven / Gradle / Ivy
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Dynamic scripting for the JVM
package org.snapscript.tree;
import org.snapscript.core.Compilation;
import org.snapscript.core.Context;
import org.snapscript.core.Evaluation;
import org.snapscript.core.Module;
import org.snapscript.core.Path;
import org.snapscript.core.Result;
import org.snapscript.core.Scope;
import org.snapscript.core.Statement;
import org.snapscript.core.Value;
import org.snapscript.core.error.ErrorHandler;
import org.snapscript.core.trace.Trace;
import org.snapscript.core.trace.TraceInterceptor;
import org.snapscript.core.trace.TraceStatement;
import org.snapscript.parse.StringToken;
public class YieldStatement implements Compilation {
private final Statement control;
public YieldStatement(StringToken token){
this(null, token);
}
public YieldStatement(Evaluation evaluation){
this(evaluation, null);
}
public YieldStatement(Evaluation evaluation, StringToken token){
this.control = new CompileResult(evaluation);
}
@Override
public Statement compile(Module module, Path path, int line) throws Exception {
Context context = module.getContext();
ErrorHandler handler = context.getHandler();
TraceInterceptor interceptor = context.getInterceptor();
Trace trace = Trace.getNormal(module, path, line);
return new TraceStatement(interceptor, handler, control, trace);
}
private static class CompileResult extends Statement {
private final Evaluation evaluation;
private final Result result;
public CompileResult(Evaluation evaluation){
this.result = Result.getYield();
this.evaluation = evaluation;
}
@Override
public Result compile(Scope scope) throws Exception {
if(evaluation != null) {
evaluation.compile(scope);
}
return result;
}
@Override
public Result execute(Scope scope) throws Exception {
if(evaluation != null) {
Value value = evaluation.evaluate(scope, null);
Object object = value.getValue();
return Result.getYield(object);
}
return result;
}
}
}