Github user jgrzebyta commented on a diff in the pull request:
https://github.com/apache/any23/pull/42#discussion_r127026645
--- Diff:
utils/src/main/java/org/apache/any23/extractor/yaml/YAMLValidator.java ---
@@ -0,0 +1,105 @@
+/*
+ * Copyright 2017 The Apache Software Foundation.
+ *
+ * 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 org.apache.any23.extractor.yaml;
+
+import com.google.common.collect.Iterables;
+import java.io.BufferedInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.Scanner;
+import java.util.regex.Pattern;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.yaml.snakeyaml.Yaml;
+
+/**
+ * Utility class provides static methods for YAML validation.
+ *
+ * @author Jacek Grzebyta (grzebyta.dev [at] gmail.com)
+ */
+public class YAMLValidator {
+
+ private static final Logger log =
LoggerFactory.getLogger(YAMLValidator.class);
+
+ private static final Pattern YAML_PATTERN =
Pattern.compile("^%YAML.*", Pattern.CASE_INSENSITIVE);
+
+ /**
+ * Detects if is contains valid YAML content.
+ * <p>
+ * In the first instance it checks if there is "%YAML" head. If not
check
+ * using the brute force method by parsing input stream with yaml
parser.
+ * </p>
+ * <p>
+ * NB. Only "false" results are trusted. Even if result is "true" you
cannot
+ * be sure that InputStream contains YAML intentional context because
+ * comma-separated-values are pars-able by YAML parser as well.
+ * </p>
+ *
+ * @param is {@link InputStream}
+ * @return
+ * @throws IOException
+ */
+ public static boolean isYAML(InputStream is) throws IOException {
+ if (is == null) {
+ return false;
+ }
+
+ if (!is.markSupported()) {
--- End diff --
I have checked in the source and `markSupported()` method olny contains
`return true` or `return false`.
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