/*
* Copyright 2014 The Closure Compiler Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.javascript.jscomp.lint;
import com.google.javascript.jscomp.AbstractCompiler;
import com.google.javascript.jscomp.CompilerPass;
import com.google.javascript.jscomp.DiagnosticType;
import com.google.javascript.jscomp.NodeTraversal;
import com.google.javascript.jscomp.NodeTraversal.AbstractPostOrderCallback;
import com.google.javascript.jscomp.NodeUtil;
import com.google.javascript.rhino.JSDocInfo;
import com.google.javascript.rhino.Node;
import java.util.HashSet;
import java.util.Set;
/**
* Check for duplicate values in enums.
*/
public final class CheckEnums extends AbstractPostOrderCallback implements CompilerPass {
public static final DiagnosticType DUPLICATE_ENUM_VALUE = DiagnosticType.warning(
"JSC_DUPLICATE_ENUM_VALUE",
"The value {0} is duplicated in this enum.");
private final AbstractCompiler compiler;
public CheckEnums(AbstractCompiler compiler) {
this.compiler = compiler;
}
@Override
public void process(Node externs, Node root) {
NodeTraversal.traverse(compiler, root, this);
}
@Override
public void visit(NodeTraversal t, Node n, Node parent) {
if (n.isObjectLit()) {
JSDocInfo jsdoc = NodeUtil.getBestJSDocInfo(n);
if (jsdoc != null && jsdoc.hasEnumParameterType()) {
checkDuplicateEnumValues(t, n);
}
}
}
private void checkDuplicateEnumValues(NodeTraversal t, Node n) {
Set<String> values = new HashSet<>();
for (Node child : n.children()) {
Node valueNode = child.getFirstChild();
String value;
if (valueNode.isString()) {
value = valueNode.getString();
} else if (valueNode.isNumber()) {
value = Double.toString(valueNode.getDouble());
} else {
return;
}
if (values.contains(value)) {
t.report(valueNode, DUPLICATE_ENUM_VALUE, value);
} else {
values.add(value);
}
}
}
}