Polished up work on AST-based dice

1 files changed, 47 insertions, 0 deletions

diff --git a/BJC-Utils2/src/main/java/bjc/utils/dice/ast/DiceASTFreezer.java b/BJC-Utils2/src/main/java/bjc/utils/dice/ast/DiceASTFreezer.java
new file mode 100644
index 0000000..04cc99b
--- /dev/null
+++ b/BJC-Utils2/src/main/java/bjc/utils/dice/ast/DiceASTFreezer.java
@@ -0,0 +1,47 @@
+package bjc.utils.dice.ast;
+
+import java.util.Map;
+
+import bjc.utils.parserutils.AST;
+
+public class DiceASTFreezer {
+	public static AST<IDiceASTNode> freezeAST(AST<IDiceASTNode> tree,
+			Map<String, AST<IDiceASTNode>> env) {
+		return tree.collapse((nod) -> {
+			if (nod instanceof VariableDiceNode) {
+				return expandNode((VariableDiceNode) nod, env);
+			} else {
+				// Type is specified here so compiler can know the type
+				// we're using
+				return new AST<IDiceASTNode>(nod);
+			}
+		} , (op) -> (left, right) -> {
+			return new AST<IDiceASTNode>(op, left, right);
+		} , (r) -> r);
+	}
+
+	public static AST<IDiceASTNode> freezeAST(DiceASTExpression tree,
+			Map<String, DiceASTExpression> env) {
+		return tree.getAst().collapse((nod) -> {
+			if (nod instanceof VariableDiceNode) {
+				return expandNode2((VariableDiceNode) nod, env);
+			} else {
+				// Type is specified here so compiler can know the type
+				// we're using
+				return new AST<IDiceASTNode>(nod);
+			}
+		} , (op) -> (left, right) -> {
+			return new AST<IDiceASTNode>(op, left, right);
+		} , (r) -> r);
+	}
+
+	private static AST<IDiceASTNode> expandNode(VariableDiceNode vnode,
+			Map<String, AST<IDiceASTNode>> env) {
+		return env.get(vnode.getVariable());
+	}
+
+	private static AST<IDiceASTNode> expandNode2(VariableDiceNode vnode,
+			Map<String, DiceASTExpression> env) {
+		return env.get(vnode.getVariable()).getAst();
+	}
+}