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