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package bjc.dicelang.ast;
import java.util.Map;
import java.util.function.Consumer;
import bjc.dicelang.ast.nodes.DiceASTType;
import bjc.dicelang.ast.nodes.IDiceASTNode;
import bjc.dicelang.ast.nodes.VariableDiceNode;
import bjc.utils.data.IHolder;
/**
* Check if the specified node references a particular variable
*
* @author ben
*
*/
public final class DiceASTDefinedChecker
implements Consumer<IDiceASTNode> {
/**
* This is true if the specified node references the set variable
*/
private IHolder<Boolean> referencesVariable;
private Map<String, DiceASTExpression> enviroment;
/**
* Create a new reference checker
*
* @param referencesVar
* The holder of whether the variable is referenced or not
* @param env
* The enviroment to check undefinedness against
*/
public DiceASTDefinedChecker(IHolder<Boolean> referencesVar,
Map<String, DiceASTExpression> env) {
this.referencesVariable = referencesVar;
this.enviroment = env;
}
@Override
public void accept(IDiceASTNode astNode) {
referencesVariable.transform((bool) -> checkUndefined(astNode));
}
/**
* Check if a given AST node references an undefined variable
*
* @param astNode
* The node to check
* @return Whether or not the node directly the variable
*/
private boolean checkUndefined(IDiceASTNode astNode) {
if (astNode.getType() == DiceASTType.VARIABLE) {
VariableDiceNode node = (VariableDiceNode) astNode;
return !enviroment.containsKey(node.getVariable());
} else {
return false;
}
}
}
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