Move Pratt Parser to new project

1 files changed, 56 insertions, 0 deletions

diff --git a/JPratt/src/main/java/bjc/utils/parserutils/pratt/tokens/StringTokenStream.java b/JPratt/src/main/java/bjc/utils/parserutils/pratt/tokens/StringTokenStream.java
new file mode 100644
index 0000000..75e86c4
--- /dev/null
+++ b/JPratt/src/main/java/bjc/utils/parserutils/pratt/tokens/StringTokenStream.java
@@ -0,0 +1,56 @@
+package bjc.utils.parserutils.pratt.tokens;
+
+import java.util.Iterator;
+
+import bjc.utils.parserutils.pratt.Token;
+import bjc.utils.parserutils.pratt.TokenStream;
+
+import static bjc.utils.parserutils.pratt.tokens.StringToken.litToken;
+
+/**
+ * Simple implementation of token stream for strings.
+ * 
+ * The terminal token here is represented by a token with type and value
+ * '(end)'.
+ * 
+ * @author EVE
+ *
+ */
+public class StringTokenStream extends TokenStream<String, String> {
+	private Iterator<Token<String, String>> iter;
+
+	private Token<String, String> curr;
+
+	/**
+	 * Create a new token stream from a iterator.
+	 * 
+	 * @param itr
+	 *                The iterator to use.
+	 * 
+	 */
+	public StringTokenStream(Iterator<Token<String, String>> itr) {
+		iter = itr;
+
+	}
+
+	@Override
+	public Token<String, String> current() {
+		return curr;
+	}
+
+	@Override
+	public Token<String, String> next() {
+		if (iter.hasNext()) {
+			curr = iter.next();
+		} else {
+			curr = litToken("(end)");
+		}
+
+		return curr;
+	}
+
+	@Override
+	public boolean hasNext() {
+		return iter.hasNext();
+	}
+}