From 0f6565687e03968abd2e508fa8183f50f04f1cc7 Mon Sep 17 00:00:00 2001
From: bjculkin <bjculkin@mix.wvu.edu>
Date: Fri, 24 Mar 2017 16:21:07 -0400
Subject: Update Pratt Parser

---
 .../parserutils/pratt/commands/ChainCommand.java   | 47 ++++++++++++++++++++++
 1 file changed, 47 insertions(+)
 create mode 100644 BJC-Utils2/src/main/java/bjc/utils/parserutils/pratt/commands/ChainCommand.java

(limited to 'BJC-Utils2/src/main/java/bjc/utils/parserutils/pratt/commands/ChainCommand.java')

diff --git a/BJC-Utils2/src/main/java/bjc/utils/parserutils/pratt/commands/ChainCommand.java b/BJC-Utils2/src/main/java/bjc/utils/parserutils/pratt/commands/ChainCommand.java
new file mode 100644
index 0000000..aa85f75
--- /dev/null
+++ b/BJC-Utils2/src/main/java/bjc/utils/parserutils/pratt/commands/ChainCommand.java
@@ -0,0 +1,47 @@
+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.ParserContext;
+import bjc.utils.parserutils.pratt.Token;
+
+import java.util.Set;
+
+public class ChainCommand<K, V, C> extends BinaryPostCommand<K, V, C> {
+	private Set<K> chainWith;
+
+	private Token<K, V> chain;
+
+	public ChainCommand(int leftPower, Set<K> chainSet, Token<K, V> chainMarker) {
+		super(leftPower);
+
+		chainWith = chainSet;
+		chain = chainMarker;
+	}
+
+	@Override
+	public ITree<Token<K, V>> denote(ITree<Token<K, V>> operand, Token<K, V> operator,
+			ParserContext<K, V, C> ctx) throws ParserException {
+		ITree<Token<K, V>> tree = ctx.parse.parseExpression(1 + leftBinding(), ctx.tokens, ctx.state, false);
+
+		ITree<Token<K, V>> res = new Tree<>(operator, operand, tree);
+
+		if (chainWith.contains(ctx.tokens.current().getKey())) {
+			Token<K, V> tok = ctx.tokens.current();
+			ctx.tokens.next();
+
+			ITree<Token<K, V>> other = denote(tree, tok,
+					new ParserContext<>(ctx.tokens, ctx.parse, ctx.state));
+
+			return new Tree<>(chain, res, other);
+		} else {
+			return res;
+		}
+	}
+
+	@Override
+	public int nextBinding() {
+		return leftBinding() - 1;
+	}
+}
\ No newline at end of file
-- 
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