add solutions for hw6:Base

java/wspp/WordScanner.java

@@ -0,0 +1,56 @@
+package wspp;
+
+import java.io.*;
+import java.nio.charset.StandardCharsets;
+
+public class WordScanner {
+    private BufferedReader br;
+    private String line = null;
+    private int pos = 0;
+
+    public WordScanner(String fileName) throws IOException {
+        br = new BufferedReader(new InputStreamReader(
+            new FileInputStream(fileName), StandardCharsets.UTF_8));
+    }
+
+    private boolean hasNextLine() throws IOException {
+        if (line != null && pos < line.length()) return true;
+        line = br.readLine();
+        pos = 0;
+        return line != null;
+    }
+
+    private boolean isWordChar(char c) {
+        return Character.isLetter(c) || c == '\'' || 
+               Character.getType(c) == Character.DASH_PUNCTUATION;
+    }
+
+    public boolean hasNextWord() throws IOException {
+        while (hasNextLine()) {
+            while (pos < line.length() && !isWordChar(line.charAt(pos))) {
+                pos++;
+            }
+            if (pos < line.length()) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    public String nextWord() {
+        while (pos < line.length() && !isWordChar(line.charAt(pos))) {
+            pos++;
+        }
+
+        int start = pos;
+        while (pos < line.length() && isWordChar(line.charAt(pos))) {
+            pos++;
+        }
+
+        return line.substring(start, pos).toLowerCase();
+    }
+
+    public void close() throws IOException {
+        br.close();
+    }
+}