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/********************* */
/** symbol_table.h
** Original author: cconway
** Major contributors: dejan, mdeters
** Minor contributors (to current version): none
** This file is part of the CVC4 prototype.
** Copyright (c) 2009, 2010 The Analysis of Computer Systems Group (ACSys)
** Courant Institute of Mathematical Sciences
** New York University
** See the file COPYING in the top-level source directory for licensing
** information.
**
** A symbol table for the parsers' use.
**/
#include "cvc4parser_private.h"
#ifndef __CVC4__PARSER__SYMBOL_TABLE_H
#define __CVC4__PARSER__SYMBOL_TABLE_H
#include <string>
#include <stack>
#include <ext/hash_map>
#include "util/Assert.h"
namespace CVC4 {
namespace parser {
struct StringHashFunction {
size_t operator()(const std::string& str) const {
return __gnu_cxx::hash<const char*>()(str.c_str());
}
};
/**
* Generic symbol table for looking up variables by name.
*/
template <class ObjectType>
class SymbolTable {
private:
/** The name to expression bindings */
typedef __gnu_cxx::hash_map<std::string, ObjectType, StringHashFunction>
LookupTable;
/** The table iterator */
typedef typename LookupTable::iterator table_iterator;
/** The table iterator */
typedef typename LookupTable::const_iterator const_table_iterator;
/** Bindings for the names */
LookupTable d_nameBindings;
public:
/**
* Bind the name of the variable to the given expression. If the variable
* has been bind before, this will redefine it until its undefined.
*/
void bindName(const std::string& name, const ObjectType& obj) throw () {
d_nameBindings[name] = obj;
Assert(isBound(name), "Expected name to be bound!");
}
/**
* Unbinds the last binding of the name to the expression.
*/
void unbindName(const std::string& name) throw () {
table_iterator find = d_nameBindings.find(name);
if(find != d_nameBindings.end()) {
/*
find->second.pop();
if(find->second.empty()) {
*/
d_nameBindings.erase(find);
/* }*/
}
}
/**
* Returns the last binding expression of the name.
* Requires the name to have a binding in the table.
*/
ObjectType getObject(const std::string& name) throw () {
table_iterator find = d_nameBindings.find(name);
Assert(find != d_nameBindings.end());
return find->second; /*.top()*/
}
/**
* Returns true is name is bound to an expression.
*/
bool isBound(const std::string& name) const throw () {
const_table_iterator find = d_nameBindings.find(name);
return (find != d_nameBindings.end());
}
};
}/* CVC4::parser namespace */
}/* CVC4 namespace */
#endif /* __CVC4__PARSER__SYMBOL_TABLE_H */
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