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package org.zwobble.couscous.ast;
import org.zwobble.couscous.types.Type;
import org.zwobble.couscous.ast.visitors.ExpressionNodeMapper;
import org.zwobble.couscous.ast.visitors.NodeTransformer;
import org.zwobble.couscous.util.ExtraIterables;
import static org.zwobble.couscous.ast.ExpressionStatementNode.expressionStatement;
import static org.zwobble.couscous.ast.VariableReferenceNode.reference;
public class AssignmentNode implements ExpressionNode {
public static StatementNode assignStatement(AssignableExpressionNode target, ExpressionNode value) {
return expressionStatement(assign(target, value));
}
public static AssignmentNode assign(AssignableExpressionNode target, ExpressionNode value) {
return new AssignmentNode(target, value);
}
public static StatementNode assignStatement(VariableNode target, ExpressionNode value) {
return expressionStatement(assign(target, value));
}
public static AssignmentNode assign(VariableNode target, ExpressionNode value) {
return new AssignmentNode(reference(target), value);
}
private final AssignableExpressionNode target;
private final ExpressionNode value;
private AssignmentNode(AssignableExpressionNode target, ExpressionNode value) {
this.target = target;
this.value = value;
}
public AssignableExpressionNode getTarget() {
return target;
}
public ExpressionNode getValue() {
return value;
}
@Override
public <T> T accept(ExpressionNodeMapper<T> visitor) {
return visitor.visit(this);
}
@Override
public Iterable<Node> childNodes() {
return ExtraIterables.of(value, target);
}
@Override
public ExpressionNode transform(NodeTransformer transformer) {
return new AssignmentNode(
(AssignableExpressionNode) transformer.transformExpression(target),
transformer.transformExpression(value));
}
@Override
public Type getType() {
return value.getType();
}
@Override
public String toString() {
return "AssignmentNode(target=" + target + ", value=" + value + ")";
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((target == null) ? 0 : target.hashCode());
result = prime * result + ((value == null) ? 0 : value.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
AssignmentNode other = (AssignmentNode) obj;
if (target == null) {
if (other.target != null)
return false;
} else if (!target.equals(other.target))
return false;
if (value == null) {
if (other.value != null)
return false;
} else if (!value.equals(other.value))
return false;
return true;
}
}
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