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/*
* rewriter.h
*
* Created on: Dec 13, 2010
* Author: dejan
*/
#pragma once
#include "expr/node.h"
#include "expr/attribute.h"
namespace CVC4 {
namespace theory {
enum RewriteStatus {
REWRITE_DONE,
REWRITE_AGAIN,
REWRITE_AGAIN_FULL
};
/**
* Instances of this class serve as response codes from
* Theory::preRewrite() and Theory::postRewrite(). Instances of
* derived classes RewriteComplete(n), RewriteAgain(n), and
* FullRewriteNeeded(n) should be used, giving self-documenting
* rewrite behavior.
*/
struct RewriteResponse {
const RewriteStatus status;
const Node node;
RewriteResponse(RewriteStatus status, Node node) : status(status), node(node) {}
};
class Rewriter {
/** Returns the appropriate cache for a node */
static Node getPreRewriteCache(theory::TheoryId theoryId, TNode node);
/** Returns the appropriate cache for a node */
static Node getPostRewriteCache(theory::TheoryId theoryId, TNode node);
/** Sets the appropriate cache for a node */
static void setPreRewriteCache(theory::TheoryId theoryId, TNode node, TNode cache);
/** Sets the appropriate cache for a node */
static void setPostRewriteCache(theory::TheoryId theoryId, TNode node, TNode cache);
public:
/** Calls the pre rewrite for the given theory */
static RewriteResponse callPreRewrite(theory::TheoryId theoryId, TNode node);
/** Calls the post rewrite for the given theory */
static RewriteResponse callPostRewrite(theory::TheoryId theoryId, TNode node);
/**
* Rewrites the node using theoryOf to determine which rewriter to use on the node.
*/
static Node rewrite(Node node);
/**
* Rewrites the node using the given theory rewriter.
*/
static Node rewriteTo(theory::TheoryId theoryId, Node node);
/**
* Should be called before the rewriter get's used for the first time.
*/
static void init();
/**
* Should be called to clean up any state.
*/
static void shutdown();
};
} // Namesapce theory
} // Namespace CVC4
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