Move Pratt Parser to new project

1 files changed, 75 insertions, 0 deletions

diff --git a/JPratt/src/main/java/bjc/utils/parserutils/pratt/commands/PreTernaryCommand.java b/JPratt/src/main/java/bjc/utils/parserutils/pratt/commands/PreTernaryCommand.java
new file mode 100644
index 0000000..42d1a6e
--- /dev/null
+++ b/JPratt/src/main/java/bjc/utils/parserutils/pratt/commands/PreTernaryCommand.java
@@ -0,0 +1,75 @@
+package bjc.utils.parserutils.pratt.commands;
+
+import bjc.utils.data.ITree;
+import bjc.utils.data.Tree;
+import bjc.utils.parserutils.ParserException;
+import bjc.utils.parserutils.pratt.ParseBlock;
+import bjc.utils.parserutils.pratt.ParserContext;
+import bjc.utils.parserutils.pratt.Token;
+
+/**
+ * A prefix ternary operator, like an if/then/else group.
+ * 
+ * @author bjculkin
+ *
+ * @param <K>
+ *                The key type of the tokens.
+ * 
+ * @param <V>
+ *                The value type of the tokens.
+ * 
+ * @param <C>
+ *                The state type of the parser.
+ */
+public class PreTernaryCommand<K, V, C> extends AbstractInitialCommand<K, V, C> {
+	private Token<K, V> term;
+
+	private ParseBlock<K, V, C> condBlock;
+
+	private ParseBlock<K, V, C>	opblock1;
+	private ParseBlock<K, V, C>	opblock2;
+
+	/**
+	 * Create a new ternary statement.
+	 * 
+	 * @param cond
+	 *                The block for handling the condition.
+	 * 
+	 * @param op1
+	 *                The block for handling the first operator.
+	 * 
+	 * @param op2
+	 *                The block for handling the second operator.
+	 * 
+	 * @param term
+	 *                The token to use as the node for the AST.
+	 */
+	public PreTernaryCommand(ParseBlock<K, V, C> cond, ParseBlock<K, V, C> op1, ParseBlock<K, V, C> op2,
+			Token<K, V> term) {
+		super();
+
+		if (cond == null)
+			throw new NullPointerException("Cond block must not be null");
+		else if (op1 == null)
+			throw new NullPointerException("Op block #1 must not be null");
+		else if (op2 == null) throw new NullPointerException("Op block #2 must not be null");
+
+		this.condBlock = cond;
+		this.opblock1 = op1;
+		this.opblock2 = op2;
+
+		this.term = term;
+	}
+
+	@Override
+	protected ITree<Token<K, V>> intNullDenotation(Token<K, V> operator, ParserContext<K, V, C> ctx)
+			throws ParserException {
+		ITree<Token<K, V>> cond = condBlock.parse(ctx);
+
+		ITree<Token<K, V>> op1 = opblock1.parse(ctx);
+
+		ITree<Token<K, V>> op2 = opblock2.parse(ctx);
+
+		return new Tree<>(term, cond, op1, op2);
+	}
+}
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