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#ifndef __FIXEXPR_H
#define __FIXEXPR_H
#include <map>
#include <aterm2.h>
#include "util.hh"
/* Fix expressions are represented as ATerms. The maximal sharing
property of the ATerm library allows us to implement caching of
normals forms efficiently. */
typedef ATerm Expr;
/* Generic bottomup traversal over ATerms. The traversal first
recursively descends into subterms, and then applies the given term
function to the resulting term. */
struct TermFun
{
virtual ATerm operator () (ATerm e) = 0;
};
ATerm bottomupRewrite(TermFun & f, ATerm e);
/* Query all attributes in an attribute set expression. The
expression must be in normal form. */
typedef map<string, Expr> Attrs;
void queryAllAttrs(Expr e, Attrs & attrs);
/* Query a specific attribute from an attribute set expression. The
expression must be in normal form. */
Expr queryAttr(Expr e, const string & name);
/* Create an attribute set expression from an Attrs value. */
Expr makeAttrs(const Attrs & attrs);
/* Perform a set of substitutions on an expression. */
typedef map<string, Expr> Subs;
ATerm substitute(Subs & subs, ATerm e);
#endif /* !__FIXEXPR_H */
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