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package bjc.utils.dice.ast;
import java.util.Map;
import bjc.utils.parserutils.AST;
/**
* Freeze references in a dice AST, replacing variable references with what
* the variables refer to
*
* @author ben
*
*/
public class DiceASTFreezer {
/**
* Expand a reference
*
* @param vnode
* The node containing the reference to expand
* @param env
* The enviroment to expand against
* @return The expanded reference
*/
private static AST<IDiceASTNode> expandNode(VariableDiceNode vnode,
Map<String, AST<IDiceASTNode>> env) {
return env.get(vnode.getVariable());
}
/**
* Expand a reference
*
* @param vnode
* The node containing the reference to expand
* @param env
* The enviroment to expand against
* @return The expanded reference
*/
private static AST<IDiceASTNode> expandNode2(VariableDiceNode vnode,
Map<String, DiceASTExpression> env) {
return env.get(vnode.getVariable()).getAst();
}
/**
* Freeze the references in an AST
*
* @param tree
* The tree to freeze references in
* @param env
* The enviroment to get reference values from
* @return The tree with references frozen
*/
@SuppressWarnings("unused")
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);
}
/**
* Freeze the references in an expression backed by an AST
*
* @param tree
* The tree-backed expression to freeze references in
* @param env
* The enviroment to get reference values from
* @return The tree with references frozen
*/
@SuppressWarnings("unused")
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);
}
}
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