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// Copyright 2018 The Bazel Authors. All rights reserved.
//
// 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.devtools.build.android.resources;
import static java.util.stream.Collectors.joining;
import com.google.common.collect.ImmutableSet;
import java.util.function.Predicate;
import java.util.regex.Pattern;
import java.util.stream.Stream;
/** Validates resource identifiers and packages for java identifier validity. */
public class JavaIdentifierValidator {
private JavaIdentifierValidator() {}
/** Thrown when a resource filed is not a valida java identifier. */
public static class InvalidJavaIdentifier extends RuntimeException {
/** Creates a new exception. */
public InvalidJavaIdentifier(String message) {
super(message);
}
}
/**
* Validates a resource identifier for java correctness.
*
* @param identifier an identifier derived from an android resource.
* @param additionalInformation optional information about the identifier.
* @return The identifier if valid.
* @throws InvalidJavaIdentifier if the identifier is invalid.
*/
public static String validate(String identifier, Object... additionalInformation) {
if (VALID_JAVA_IDENTIFIER.test(identifier)) {
return identifier;
}
throw new InvalidJavaIdentifier(
String.format(
"%s is an invalid java identifier %s.",
identifier,
Stream.of(additionalInformation).map(Object::toString).collect(joining(" "))));
}
private static final ImmutableSet<String> JAVA_RESERVED =
ImmutableSet.of(
"abstract",
"assert",
"boolean",
"break",
"byte",
"case",
"catch",
"char",
"class",
"const",
"continue",
"default",
"double",
"do",
"else",
"enum",
"extends",
"false",
"final",
"finally",
"float",
"for",
"goto",
"if",
"implements",
"import",
"instanceof",
"int",
"interface",
"long",
"native",
"new",
"null",
"package",
"private",
"protected",
"public",
"return",
"short",
"static",
"strictfp",
"super",
"switch",
"synchronized",
"this",
"throw",
"throws",
"transient",
"true",
"try",
"void",
"volatile",
"while");
private static final Predicate<String> VALID_JAVA_IDENTIFIER =
((Predicate<String>) JAVA_RESERVED::contains)
.negate()
.and(Pattern.compile("^([a-zA-Z_$][a-zA-Z\\d_$]*)$").asPredicate());
}
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