From 5e246adccf986af9dd032d6e8645ddd5d2a577d4 Mon Sep 17 00:00:00 2001
From: bculkin2442 <bjculkin@mix.wvu.edu>
Date: Fri, 24 Feb 2017 04:15:20 -0500
Subject: Work on unary operators

Specifically, the coercive operator for allowing mixing floats and ints
---
 dice-lang/src/bjc/dicelang/v2/Evaluator.java | 24 ++++++++++++++++++++++--
 1 file changed, 22 insertions(+), 2 deletions(-)

(limited to 'dice-lang/src/bjc/dicelang/v2/Evaluator.java')

diff --git a/dice-lang/src/bjc/dicelang/v2/Evaluator.java b/dice-lang/src/bjc/dicelang/v2/Evaluator.java
index 72d7779..969b2d5 100644
--- a/dice-lang/src/bjc/dicelang/v2/Evaluator.java
+++ b/dice-lang/src/bjc/dicelang/v2/Evaluator.java
@@ -158,6 +158,13 @@ public class Evaluator {
 
 	private TopDownTransformResult pickEvaluationType(Node nd) {
 		switch(nd.type) {
+			case UNARYOP:
+				switch(nd.operatorType) {
+					case COERCE:
+						return TopDownTransformResult.PULLUP;
+					default:
+						return TopDownTransformResult.PUSHDOWN;
+				}
 			default:
 				return TopDownTransformResult.PUSHDOWN;
 		}
@@ -166,8 +173,7 @@ public class Evaluator {
 	private ITree<Node> evaluateNode(ITree<Node> ast, Context ctx) {
 		switch(ast.getHead().type) {
 			case UNARYOP:
-				System.out.println("\tEVALUATOR ERROR: Unary operator evaluation isn't supported yet");
-				return new Tree<>(FAIL(ast));
+				return evaluateUnaryOp(ast, ctx);
 			case BINOP:
 				return evaluateBinaryOp(ast, ctx);
 			case TOKREF:
@@ -180,6 +186,20 @@ public class Evaluator {
 		}
 	}
 
+	private ITree<Node> evaluateUnaryOp(ITree<Node> ast, Context ctx) {
+		switch(ast.getHead().operatorType) {
+			case COERCE:
+				if(ast.getChildrenCount() != 1) {
+					Errors.inst.printError(EK_EVAL_NOTUNARY, ast.getChildrenCount());
+					return new Tree<>(FAIL(AST));
+				}
+				break;
+			default:
+				Errors.inst.printError(EK_EVAL_INVUNARY, ast.getHead().operatorType.toString());
+				return new Tree<>(FAIL(ast));
+		}
+	}
+
 	private ITree<Node> evaluateBinaryOp(ITree<Node> ast, Context ctx) {
 		Token.Type binOp = ast.getHead().operatorType;
 
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