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Add an 'include' keyword

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Inclusion is like importing, except that all variables that in scope
at the 'include' site are in scope of the included file.

Thus, if ./foo.nix contains 'x', then

  let x = 1; in include ./foo.nix

evaluates to 1.

(Note that 'include' has to be a keyword, not a builtin function,
because inclusion takes place within a specific scope. I.e. 'include
./foo.nix' would not be equivalent to 'let f = include; in ... f
./foo.nix ...'.)
This commit is contained in:
Eelco Dolstra 2018-03-02 17:12:54 +01:00
parent 939cf4cceb
commit 64ea7cc437
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GPG key ID: 8170B4726D7198DE
10 changed files with 75 additions and 4 deletions
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15
src/libexpr/nixexpr.hh
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@ -86,9 +86,9 @@ struct Expr
std::ostream & operator << (std::ostream & str, Expr & e);
#define COMMON_METHODS \
void show(std::ostream & str); \
void eval(EvalState & state, Env & env, Value & v); \
void bindVars(const StaticEnv & env);
void show(std::ostream & str) override; \
void eval(EvalState & state, Env & env, Value & v) override; \
void bindVars(const StaticEnv & env) override;
struct ExprInt : Expr
{
@ -326,6 +326,15 @@ struct ExprPos : Expr
COMMON_METHODS
};
struct ExprInclude : Expr
{
Pos pos;
Expr * path;
StaticEnv * staticEnv;
ExprInclude(const Pos & pos, Expr * path) : pos(pos), path(path) { };
COMMON_METHODS
};
/* Static environments are used to map variable names onto (level,
displacement) pairs used to obtain the value of the variable at