Update Pratt Parser

1 files changed, 47 insertions, 0 deletions

diff --git a/BJC-Utils2/src/main/java/bjc/utils/parserutils/pratt/commands/TernaryCommand.java b/BJC-Utils2/src/main/java/bjc/utils/parserutils/pratt/commands/TernaryCommand.java
new file mode 100644
index 0000000..c3204b9
--- /dev/null
+++ b/BJC-Utils2/src/main/java/bjc/utils/parserutils/pratt/commands/TernaryCommand.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;
+
+public class TernaryCommand<K, V, C> extends BinaryPostCommand<K, V, C> {
+	private K term;
+
+	private int innerExp;
+
+	private Token<K, V> mark;
+
+	private boolean nonassoc;
+
+	public TernaryCommand(int leftPower, K terminator, Token<K, V> marker, boolean isNonassoc) {
+		super(leftPower);
+
+		term = terminator;
+		mark = marker;
+		nonassoc = isNonassoc;
+	}
+
+	@SuppressWarnings("unchecked")
+	@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>> inner = ctx.parse.parseExpression(innerExp, ctx.tokens, ctx.state, false);
+
+		ctx.tokens.expect(term);
+
+		ITree<Token<K, V>> outer = ctx.parse.parseExpression(1 + leftBinding(), ctx.tokens, ctx.state, false);
+
+		return new Tree<>(mark, inner, operand, outer);
+	}
+
+	@Override
+	public int nextBinding() {
+		if (nonassoc) {
+			return leftBinding() - 1;
+		} else {
+			return leftBinding();
+		}
+	}
+}
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