Writing a PGN parser.

src/main/java/net/skytreader/kode/chesstemplar/utils/NotationParser.java

@@ -47,6 +47,11 @@ public class NotationParser{
         Pattern.compile(CASTLING_REGEX),
         Pattern.compile(CHECK_REGEX)
     };
+
+    private class Movement{
+        public Point origin;
+        public Point destination;
+    }
 
     /**
     Returns true if the given string is valid chess algebraic notation.
@@ -62,11 +67,11 @@ public static boolean isValid(String s){
         return isValid;
     }
 
-    public static Point parse(String s){
+    public static Point parse(String s) throws InvalidStateException{
         if(isValid(s)){
             return null;
         } else{
-            throw InvalidStateException("Invalid algebraic notation: " + s);
+            throw new InvalidStateException("Invalid algebraic notation: " + s);
         }
     }
 

src/main/java/net/skytreader/kode/chesstemplar/utils/PGN.java

@@ -0,0 +1,30 @@
+package net.skytreader.kode.chesstemplar.utils;
+
+import java.io.BufferedReader;
+import java.io.FileInputStream;
+import java.io.InputStreamReader;
+import java.io.IOException;
+
+import java.util.HashMap;
+import java.util.regex.Pattern;
+
+public class PGN{
+    private HashMap<String, String> metadata;
+    private String gamefeed;
+
+    protected static final Pattern METADATA_PATTERN = Pattern.compile("\\[.+\\]");
+    protected static final Pattern METADATA_CAPTURE_PATTERN = Pattern.compile("\\[(.+)\\s+[\"\'](.+)[\"\']\\]");
+
+    public PGN(String filename) throws IOException{
+        BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(filename)));
+        try{
+            String line = br.readLine().trim();
+
+            while(line != null && PGN.METADATA_PATTERN.matcher(line).matches()){
+                line = br.readLine().trim();
+            }
+        } finally{
+            br.close();
+        }
+    }
+}

src/test/java/net/skytreader/kode/chesstemplar/utils/PGNTest.java

@@ -0,0 +1,41 @@
+package net.skytreader.kode.chesstemplar.utils;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.util.regex.Matcher;
+
+public class PGNTest{
+
+    @Test
+    public void testMetadataPattern(){
+        String[] metadata = {
+            "[Event \"Local Event\"]",
+			"[Site \"Local Site\"]",
+			"[Date \"2017.08.01\"]",
+			"[Round \"1\"]",
+			"[White \"chad\"]",
+			"[Black \"PyChess.py\"]",
+			"[Result \"0-1\"]",
+			"[ECO \"B23\"]",
+			"[TimeControl \"300+0\"]",
+			"[Time \"21:49:00\"]",
+			"[WhiteClock \"0:00:43.901\"]",
+			"[BlackClock \"0:04:54.370\"]",
+			"[PlyCount \"50\"]"
+        };
+
+        for(int i = 0; i < metadata.length; i++){
+            Assert.assertTrue(PGN.METADATA_PATTERN.matcher(metadata[i]).matches());
+        }
+    }
+
+    @Test
+    public void testMetadataCapturePattern(){
+        String test = "[Event \"Local Event\"]";
+        Matcher m = PGN.METADATA_CAPTURE_PATTERN.matcher(test);
+        Assert.assertTrue(m.matches());
+        Assert.assertEquals("Event", m.group(1));
+        Assert.assertEquals("Local Event", m.group(2));
+    }
+}