package com.strobel.decompiler.patterns;
import com.strobel.core.VerifyArgument;
import com.strobel.decompiler.languages.java.ast.AssignmentExpression;
import com.strobel.decompiler.languages.java.ast.AssignmentOperatorType;
import com.strobel.decompiler.languages.java.ast.Expression;
import java.util.ArrayDeque;
public class AssignmentChain extends Pattern {
private final INode _valuePattern;
private final INode _targetPattern;
public AssignmentChain(final INode targetPattern, final INode valuePattern) {
_targetPattern = VerifyArgument.notNull(targetPattern, "targetPattern");
_valuePattern = VerifyArgument.notNull(valuePattern, "valuePattern");
}
public final INode getTargetPattern() {
return _targetPattern;
}
public final INode getValuePattern() {
return _valuePattern;
}
@Override
public boolean matches(final INode other, final Match match) {
if (other instanceof AssignmentExpression) {
final ArrayDeque<AssignmentExpression> assignments = new ArrayDeque<>();
INode current = other;
final int checkPoint = match.getCheckPoint();
while (current instanceof AssignmentExpression &&
((AssignmentExpression) current).getOperator() == AssignmentOperatorType.ASSIGN) {
final AssignmentExpression assignment = (AssignmentExpression) current;
final Expression target = assignment.getLeft();
if (!_targetPattern.matches(target, match)) {
assignments.clear();
match.restoreCheckPoint(checkPoint);
break;
}
assignments.addLast(assignment);
current = assignment.getRight();
}
if (assignments.isEmpty() || !_valuePattern.matches(assignments.getLast().getRight(), match)) {
match.restoreCheckPoint(checkPoint);
return false;
}
return true;
}
return false;
}
}