linter/src/main/java/org/apache/royale/linter/rules/MaxParametersRule.java

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//  contributor license agreements.  See the NOTICE file distributed with
//  this work for additional information regarding copyright ownership.
//  The ASF licenses this file to You under the Apache License, Version 2.0
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//      http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.royale.linter.rules;

import java.util.Collection;
import java.util.HashMap;
import java.util.Map;

import org.apache.royale.compiler.problems.CompilerProblem;
import org.apache.royale.compiler.problems.ICompilerProblem;
import org.apache.royale.compiler.tree.ASTNodeID;
import org.apache.royale.compiler.tree.as.IFunctionNode;
import org.apache.royale.linter.LinterRule;
import org.apache.royale.linter.NodeVisitor;
import org.apache.royale.linter.TokenQuery;

/**
 * Checks the number of function parameters.
 */
public class MaxParametersRule extends LinterRule {
	@Override
	public Map<ASTNodeID, NodeVisitor> getNodeVisitors() {
		Map<ASTNodeID, NodeVisitor> result = new HashMap<>();
		result.put(ASTNodeID.FunctionID, (node, tokenQuery, problems) -> {
			checkFunctionNode((IFunctionNode) node, tokenQuery, problems);
		});
		return result;
	}

	public int maximum = 6;

	private void checkFunctionNode(IFunctionNode functionNode, TokenQuery tokenQuery, Collection<ICompilerProblem> problems) {
		if (functionNode.getParameterNodes().length <= maximum) {
			return;
		}
		problems.add(new MaxParametersLinterProblem(functionNode, maximum));
	}

	public static class MaxParametersLinterProblem extends CompilerProblem {
		public static final String DESCRIPTION = "Function '${functionName}' has ${params} parameters, but expected no more than ${maxParams} parameters";

		public MaxParametersLinterProblem(IFunctionNode node, int maxParams)
		{
			super(node.getParametersContainerNode());
			this.maxParams = maxParams;
			params = node.getParameterNodes().length;
			functionName = node.getName();
		}

		public String functionName;
		public int params;
		public int maxParams;
	}
}