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d7efd76394
concatenation and string coercion. This was a big mess (see
e.g. NIX-67). Contexts are now folded into strings, so that they
don't cause evaluation errors when they're not expected. The
semantics of paths has been clarified (see nixexpr-ast.def).
toString() and coerceToString() have been merged.
Semantic change: paths are now copied to the store when they're in a
concatenation (and in most other situations - that's the
formalisation of the meaning of a path). So
"foo " + ./bla
evaluates to "foo /nix/store/hash...-bla", not "foo
/path/to/current-dir/bla". This prevents accidental impurities, and
is more consistent with the treatment of derivation outputs, e.g.,
`"foo " + bla' where `bla' is a derivation. (Here `bla' would be
replaced by the output path of `bla'.)
96 lines
2.7 KiB
C++
96 lines
2.7 KiB
C++
#ifndef __EVAL_H
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#define __EVAL_H
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#include <map>
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#include "aterm.hh"
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#include "nixexpr.hh"
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namespace nix {
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class Hash;
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typedef std::map<Path, PathSet> DrvRoots;
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typedef std::map<Path, Hash> DrvHashes;
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/* Cache for calls to addToStore(); maps source paths to the store
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paths. */
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typedef std::map<Path, Path> SrcToStore;
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struct EvalState;
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/* Note: using a ATermVector is safe here, since when we call a primop
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we also have an ATermList on the stack. */
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typedef Expr (* PrimOp) (EvalState &, const ATermVector & args);
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struct EvalState
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{
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ATermMap normalForms;
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ATermMap primOps;
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DrvRoots drvRoots;
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DrvHashes drvHashes; /* normalised derivation hashes */
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SrcToStore srcToStore;
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unsigned int nrEvaluated;
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unsigned int nrCached;
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EvalState();
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void addPrimOps();
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void addPrimOp(const string & name,
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unsigned int arity, PrimOp primOp);
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};
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/* Evaluate an expression to normal form. */
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Expr evalExpr(EvalState & state, Expr e);
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/* Evaluate an expression read from the given file to normal form. */
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Expr evalFile(EvalState & state, const Path & path);
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/* Evaluate an expression, and recursively evaluate list elements and
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attributes. If `canonicalise' is true, we remove things like
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position information and make sure that attribute sets are in
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sorded order. */
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Expr strictEvalExpr(EvalState & state, Expr e,
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bool canonicalise = false);
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/* Specific results. */
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string evalString(EvalState & state, Expr e, PathSet & context);
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string evalStringNoCtx(EvalState & state, Expr e);
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int evalInt(EvalState & state, Expr e);
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bool evalBool(EvalState & state, Expr e);
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ATermList evalList(EvalState & state, Expr e);
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/* Flatten nested lists into a single list (or expand a singleton into
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a list). */
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ATermList flattenList(EvalState & state, Expr e);
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/* String coercion. Converts strings, paths and derivations to a
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string. If `coerceMore' is set, also converts nulls, integers,
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booleans and lists to a string. */
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string coerceToString(EvalState & state, Expr e, PathSet & context,
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bool coerceMore = false, bool copyToStore = true);
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/* Path coercion. Converts strings, paths and derivations to a path.
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The result is guaranteed to be an canonicalised, absolute path.
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Nothing is copied to the store. */
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Path coerceToPath(EvalState & state, Expr e, PathSet & context);
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/* Automatically call a function for which each argument has a default
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value or has a binding in the `args' map. Note: result is a call,
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not a normal form; it should be evaluated by calling evalExpr(). */
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Expr autoCallFunction(Expr e, const ATermMap & args);
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/* Print statistics. */
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void printEvalStats(EvalState & state);
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}
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#endif /* !__EVAL_H */
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