72 lines
1.6 KiB
C++
72 lines
1.6 KiB
C++
#ifndef __NIXEXPR_H
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#define __NIXEXPR_H
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#include <map>
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#include "aterm-map.hh"
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#include "types.hh"
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namespace nix {
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MakeError(EvalError, Error)
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MakeError(ParseError, Error)
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MakeError(AssertionError, EvalError)
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MakeError(ThrownError, AssertionError)
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MakeError(Abort, EvalError)
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MakeError(TypeError, EvalError)
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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 DefaultValue;
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typedef ATerm Pos;
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typedef ATerm Pattern;
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typedef ATerm ATermBool;
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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 ~TermFun() { }
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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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/* Create an attribute set expression from an Attrs value. */
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Expr makeAttrs(const ATermMap & attrs);
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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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/* Manipulation of Str() nodes. Note: matchStr() does not clear
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context! */
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bool matchStr(Expr e, string & s, PathSet & context);
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Expr makeStr(const string & s, const PathSet & context = PathSet());
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}
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#endif /* !__NIXEXPR_H */
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