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/********************* */
/*! \file term_context_stack.h
** \verbatim
** Top contributors (to current version):
** Andrew Reynolds
** This file is part of the CVC4 project.
** Copyright (c) 2009-2020 by the authors listed in the file AUTHORS
** in the top-level source directory) and their institutional affiliations.
** All rights reserved. See the file COPYING in the top-level source
** directory for licensing information.\endverbatim
**
** \brief Term context
**/
#include "cvc4_private.h"
#ifndef CVC4__EXPR__TERM_CONTEXT_STACK_H
#define CVC4__EXPR__TERM_CONTEXT_STACK_H
#include "expr/term_context_node.h"
namespace CVC4 {
/**
* A stack for term-context-sensitive terms. Its main advantage is that
* it does not rely on explicit construction of TCtxNode for efficiency.
*/
class TCtxStack
{
public:
TCtxStack(const TermContext* tctx);
virtual ~TCtxStack() {}
/** Push t to the stack */
void pushInitial(Node t);
/**
* Push all children of t to the stack, where tval is the term context hash
* of t. */
void pushChildren(Node t, uint32_t tval);
/**
* Push the child of t with the given index to the stack, where tval is
* the term context hash of t.
*/
void pushChild(Node t, uint32_t tval, size_t index);
/**
* Push the operator of t to the stack, where tval is the term context has
* of t.
*/
void pushOp(Node t, uint32_t tval);
/** Push t to the stack with term context hash tval. */
void push(Node t, uint32_t tval);
/** Pop a term from the context */
void pop();
/** Clear the stack */
void clear();
/** Return the size of the stack */
size_t size() const;
/** Return true if the stack is empty */
bool empty() const;
/** Get the current stack element */
std::pair<Node, uint32_t> getCurrent() const;
/** Get the current stack element, node version */
TCtxNode getCurrentNode() const;
private:
/** The stack */
std::vector<std::pair<Node, uint32_t>> d_stack;
/** The term context */
const TermContext* d_tctx;
};
} // namespace CVC4
#endif /* CVC4__EXPR__TERM_CONTEXT_STACK_H */
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