[LIB-9] Set of entities for PGN parsing and formatting

[chesshog.git] / chesshog-format / src / main / java / org / hedgecode / chess / pgn / PGNUtils.java

diff --git a/chesshog-format/src/main/java/org/hedgecode/chess/pgn/PGNUtils.java b/chesshog-format/src/main/java/org/hedgecode/chess/pgn/PGNUtils.java
new file mode 100644 (file)
index 0000000..822c31f
--- /dev/null
+++ b/chesshog-format/src/main/java/org/hedgecode/chess/pgn/PGNUtils.java
@@ -0,0 +1,81 @@
+/*
+ * Copyright (c) 2018-2020. Developed by Hedgecode.
+ *
+ * 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.hedgecode.chess.pgn;
+
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+/**
+ * PGNUtils
+ *
+ * @author Dmitry Samoshin aka gotty
+ */
+public final class PGNUtils {
+
+    private static final char BACKSLASH = '\\';
+    private static final String SHIELD_REGEX = "\\\\";
+
+    private static final String CRLF = "\\r?\\n";
+    private static final String SPACE = " ";
+
+    public static String match(String source, String regex) {
+        Matcher matcher = Pattern.compile(
+                regex,
+                Pattern.MULTILINE
+        ).matcher(source);
+        if (matcher.find()) {
+            return matcher.groupCount() > 0
+                    ? matcher.group(1)
+                    : matcher.group();
+        }
+        return null;
+    }
+
+    public static boolean isPgn(String source) {
+        return match(
+                source,
+                PGNConstants.PGN_DETECT_REGEX
+        ) != null;
+    }
+
+    public static String shield(String source, char[] shields) {
+        for (char shield : shields) {
+            if (source.indexOf(shield) >= 0) {
+                String regexShield =
+                        shield == BACKSLASH
+                                ? SHIELD_REGEX
+                                : String.valueOf(shield);
+                source = source.replaceAll(
+                        String.format("([%s])", regexShield),
+                        SHIELD_REGEX.concat("$1")
+                );
+            }
+        }
+        return source;
+    }
+
+    public static String stripCrlf(String pgn) {
+        return pgn.replaceAll(CRLF, SPACE);
+    }
+
+    private PGNUtils() {
+        throw new AssertionError(
+                String.format("No %s instances!", getClass().getName())
+        );
+    }
+
+}