Add exceptions to sample lang.

2 files changed, 79 insertions, 75 deletions

diff --git a/JPratt/src/main/java/bjc/pratt/blocks/ChainParseBlock.java b/JPratt/src/main/java/bjc/pratt/blocks/ChainParseBlock.java
new file mode 100644
index 0000000..1758c17
--- /dev/null
+++ b/JPratt/src/main/java/bjc/pratt/blocks/ChainParseBlock.java
@@ -0,0 +1,79 @@
+package bjc.pratt.blocks;
+
+import java.util.Set;
+
+import bjc.pratt.ParseBlock;
+import bjc.pratt.ParserContext;
+import bjc.pratt.Token;
+import bjc.utils.data.ITree;
+import bjc.utils.data.Tree;
+import bjc.utils.parserutils.ParserException;
+
+/**
+ * A {@link ParseBlock} for a series of parse blocks, linked by a set of tokens.
+ * 
+ * Roughly analogous to Perl 6s list associative operators.
+ * 
+ * @author bjculkin
+ * 
+ * @param <K>
+ *                The token key type.
+ * 
+ * @param <V>
+ *                The token value type.
+ * 
+ * @param <C>
+ *                The parser state type.
+ *
+ */
+public class ChainParseBlock<K, V, C> implements ParseBlock<K, V, C> {
+	private ParseBlock<K, V, C> iner;
+
+	private Set<K> indicators;
+
+	private Token<K, V> trm;
+
+	/**
+	 * Create a new chain parser block.
+	 * 
+	 * @param inner
+	 *                The block for the chains interior.
+	 * 
+	 * @param chainIndicators
+	 *                The set of markers that indicate continuing the chain
+	 * 
+	 * @param term
+	 *                The node in the AST for the expression.
+	 */
+	public ChainParseBlock(ParseBlock<K, V, C> inner, Set<K> chainIndicators, Token<K, V> term) {
+		iner = inner;
+		indicators = chainIndicators;
+		trm = term;
+	}
+
+	@Override
+	public ITree<Token<K, V>> parse(ParserContext<K, V, C> ctx) throws ParserException {
+		ITree<Token<K, V>> expression = iner.parse(ctx);
+
+		Token<K, V> currentToken = ctx.tokens.current();
+		if (indicators.contains(currentToken.getKey())) {
+			ITree<Token<K, V>> res = new Tree<>(trm);
+			res.addChild(expression);
+
+			while (indicators.contains(currentToken.getKey())) {
+				res.addChild(new Tree<>(currentToken));
+				ctx.tokens.next();
+
+				ITree<Token<K, V>> innerExpression = iner.parse(ctx);
+				res.addChild(innerExpression);
+
+				currentToken = ctx.tokens.current();
+			}
+
+			return res;
+		}
+
+		return expression;
+	}
+
+}
diff --git a/JPratt/src/main/java/bjc/pratt/commands/BlockNonInitialCommand.java b/JPratt/src/main/java/bjc/pratt/commands/BlockNonInitialCommand.java
deleted file mode 100644
index c361c73..0000000
--- a/JPratt/src/main/java/bjc/pratt/commands/BlockNonInitialCommand.java
+++ /dev/null
@@ -1,75 +0,0 @@
-package bjc.pratt.commands;
-
-import bjc.pratt.NonInitialCommand;
-import bjc.pratt.ParseBlock;
-import bjc.pratt.ParserContext;
-import bjc.pratt.Token;
-import bjc.utils.data.ITree;
-import bjc.utils.data.Tree;
-import bjc.utils.parserutils.ParserException;
-
-/**
- * A non-initial command that delegates all of the work to a {@link ParseBlock}
- *
- * @author bjculkin
- *
- * @param <K>
- *                The token key type.
- *
- * @param <V>
- *                The token value type.
- *
- * @param <C>
- *                The parser state type.
- */
-public class BlockNonInitialCommand<K, V, C> extends NonInitialCommand<K, V, C> {
-	private final ParseBlock<K, V, C> innr;
-
-	private final int	lftBind;
-	private final int	nxtBind;
-
-	private final Token<K, V> trm;
-
-	/**
-	 * Create a new non-initial command that delegates to a parse block.
-	 *
-	 * @param inner
-	 *                The parse block to delegate to.
-	 *
-	 * @param leftBind
-	 *                The left binding power (precedence).
-	 *
-	 * @param rightBind
-	 *                The right binding power (associativity control).
-	 *
-	 * @param term
-	 *                The token to use as the node in the AST.
-	 */
-	public BlockNonInitialCommand(final ParseBlock<K, V, C> inner, final int leftBind, final int rightBind,
-			final Token<K, V> term) {
-		innr = inner;
-
-		lftBind = leftBind;
-		nxtBind = rightBind;
-
-		trm = term;
-	}
-
-	@Override
-	public ITree<Token<K, V>> denote(final ITree<Token<K, V>> operand, final Token<K, V> operator,
-			final ParserContext<K, V, C> ctx) throws ParserException {
-		final ITree<Token<K, V>> expression = innr.parse(ctx);
-
-		return new Tree<>(trm, expression);
-	}
-
-	@Override
-	public int leftBinding() {
-		return lftBind;
-	}
-
-	@Override
-	public int nextBinding() {
-		return nxtBind;
-	}
-}
\ No newline at end of file