forked from lix-project/lix
99 lines
2.5 KiB
C++
99 lines
2.5 KiB
C++
#ifndef __NIXEXPR_H
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#define __NIXEXPR_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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/* Nix 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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typedef ATerm Pos;
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/* Mappings from ATerms to ATerms. This is just a wrapper around
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ATerm tables. */
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class ATermMap
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{
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private:
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unsigned int maxLoadPct;
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ATermTable table;
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public:
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ATermMap(unsigned int initialSize = 64, unsigned int maxLoadPct = 75);
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ATermMap(const ATermMap & map);
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~ATermMap();
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ATermMap & ATermMap::operator = (const ATermMap & map);
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void set(ATerm key, ATerm value);
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void set(const string & key, ATerm value);
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ATerm get(ATerm key) const;
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ATerm get(const string & key) const;
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void remove(ATerm key);
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void remove(const string & key);
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ATermList keys() const;
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void add(const ATermMap & map);
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void reset();
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private:
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void add(const ATermMap & map, ATermList & keys);
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void free();
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void copy(const ATermMap & map);
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};
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/* A STL vector of ATerms. Should be used with great care since it's
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stored on the heap, and the elements are therefore not roots to the
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ATerm garbage collector. */
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typedef vector<ATerm> ATermVector;
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/* Show a position. */
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string showPos(ATerm pos);
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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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void queryAllAttrs(Expr e, ATermMap & attrs, bool withPos = false);
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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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Expr queryAttr(Expr e, const string & name, ATerm & pos);
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/* Create an attribute set expression from an Attrs value. */
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Expr makeAttrs(const ATermMap & attrs);
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/* Perform a set of substitutions on an expression. */
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Expr substitute(const ATermMap & subs, Expr e);
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/* Check whether all variables are defined in the given expression.
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Throw an exception if this isn't the case. */
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void checkVarDefs(const ATermMap & def, Expr e);
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/* Create an expression representing a boolean. */
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Expr makeBool(bool b);
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#endif /* !__NIXEXPR_H */
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