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package bjc.dicelang.ast;
import java.util.function.Consumer;
import bjc.utils.data.GenHolder;
/**
* Check if the specified node references a particular variable
*
* @author ben
*
*/
public final class DiceASTReferenceChecker
implements Consumer<IDiceASTNode> {
/**
* This is true if the specified node references the set variable
*/
private GenHolder<Boolean> referencesVariable;
private String varName;
/**
* Create a new reference checker
*
* @param referencesVar
* The holder of whether the variable is referenced or
* not
* @param varName
* The variable to check for references in
*/
public DiceASTReferenceChecker(GenHolder<Boolean> referencesVar,
String varName) {
this.referencesVariable = referencesVar;
this.varName = varName;
}
@Override
public void accept(IDiceASTNode astNode) {
if (!referencesVariable.unwrap(bool -> bool)) {
if (isDirectReferenceToLast(astNode)) {
referencesVariable.transform((bool) -> false);
}
}
}
/**
* Check if a given AST node directly references the meta-variable
* last
*
* @param astNode
* The node to check
* @return Whether or not the node directly references last
*/
private boolean isDirectReferenceToLast(IDiceASTNode astNode) {
if (astNode.getType() == DiceASTType.VARIABLE) {
VariableDiceNode node = (VariableDiceNode) astNode;
return node.getVariable().equals(varName);
} else {
return false;
}
}
}
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