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* Make `import' work.

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This commit is contained in:
Eelco Dolstra 2010-03-30 09:22:33 +00:00
parent 31428c3a06
commit d78a05ab40
4 changed files with 141 additions and 62 deletions
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38
src/libexpr/eval.hh
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@ -58,6 +58,7 @@ struct Value
const char * s;
const char * * context;
} string;
const char * path;
Bindings * attrs;
struct {
unsigned int length;
@ -107,6 +108,13 @@ static inline void mkString(Value & v, const char * s)
}
static inline void mkPath(Value & v, const char * s)
{
v.type = tPath;
v.path = s;
}
typedef std::map<Path, PathSet> DrvRoots;
typedef std::map<Path, Hash> DrvHashes;
@ -134,6 +142,10 @@ struct EvalState
EvalState();
/* Evaluate an expression read from the given file to normal
form. */
void evalFile(const Path & path, Value & v);
/* Evaluate an expression to normal form, storing the result in
value `v'. */
void eval(Expr e, Value & v);
@ -157,6 +169,18 @@ struct EvalState
void forceAttrs(Value & v);
void forceList(Value & v);
/* String coercion. Converts strings, paths and derivations to a
string. If `coerceMore' is set, also converts nulls, integers,
booleans and lists to a string. If `copyToStore' is set,
referenced paths are copied to the Nix store as a side effect.q */
string coerceToString(Value & v, PathSet & context,
bool coerceMore = false, bool copyToStore = true);
/* Path coercion. Converts strings, paths and derivations to a
path. The result is guaranteed to be a canonicalised, absolute
path. Nothing is copied to the store. */
Path coerceToPath(Value & v, PathSet & context);
private:
/* The base environment, containing the builtin functions and
@ -182,9 +206,6 @@ private:
/* Evaluate an expression to normal form. */
Expr evalExpr(EvalState & state, Expr e);
/* Evaluate an expression read from the given file to normal form. */
Expr evalFile(EvalState & state, const Path & path);
/* Evaluate an expression, and recursively evaluate list elements and
attributes. If `canonicalise' is true, we remove things like
position information and make sure that attribute sets are in
@ -202,17 +223,6 @@ ATermList evalList(EvalState & state, Expr e);
a list). */
ATermList flattenList(EvalState & state, Expr e);
/* String coercion. Converts strings, paths and derivations to a
string. If `coerceMore' is set, also converts nulls, integers,
booleans and lists to a string. */
string coerceToString(EvalState & state, Expr e, PathSet & context,
bool coerceMore = false, bool copyToStore = true);
/* Path coercion. Converts strings, paths and derivations to a path.
The result is guaranteed to be an canonicalised, absolute path.
Nothing is copied to the store. */
Path coerceToPath(EvalState & state, Expr e, PathSet & context);
/* Automatically call a function for which each argument has a default
value or has a binding in the `args' map. Note: result is a call,
not a normal form; it should be evaluated by calling evalExpr(). */