Add LineNumberingWriter

java/src/cljd/lang/LineNumberingWriter.java

@@ -0,0 +1,54 @@
+package cljd.lang;
+
+import java.io.FilterWriter;
+import java.io.IOException;
+import java.io.Writer;
+
+public class LineNumberingWriter extends FilterWriter {
+
+  private int line = 1;
+  private int column = 0;
+
+    public LineNumberingWriter(Writer out) {
+        super(out);
+    }
+
+    @Override
+    public void write(int c) throws IOException {
+        super.write(c);
+        if (c == '\n') {
+            line++;
+            column = 0;
+        } else column++;
+    }
+
+    @Override
+    public void write(char[] cbuf, int off, int len) throws IOException {
+        super.write(cbuf, off, len);
+        for (int i = off; i < off + len; i++) {
+            if (cbuf[i] == '\n') {
+                line++;
+                column = 0;
+            } else column++;
+        }
+    }
+
+    @Override
+    public void write(String str, int off, int len) throws IOException {
+        super.write(str, off, len);
+        for (int i = off; i < off + len; i++) {
+            if (str.charAt(i) == '\n') {
+                line++;
+                column = 0;
+            } else column++;
+        }
+    }
+
+    public int getLine() {
+        return line;
+    }
+
+    public int getColumn() {
+        return line;
+    }
+}