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refact: Extract scopedImport

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This commit is contained in:
Robert Hensing 2024-10-30 00:57:35 +01:00
parent 63f9159953
commit 5f691206ba
1 changed files with 35 additions and 23 deletions
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58
src/libexpr/primops.cc
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@ -178,6 +178,38 @@ static void mkOutputString(
o.second.path(*state.store, Derivation::nameFromPath(drvPath), o.first));
}
/**
* Import a Nix file with an alternate base scope, as `builtins.scopedImport` does.
*
* @param state The evaluation state.
* @param pos The position of the import call.
* @param path The path to the file to import.
* @param vScope The base scope to use for the import.
* @param v Return value
*/
static void scopedImport(EvalState & state, const PosIdx pos, SourcePath & path, Value * vScope, Value & v) {
state.forceAttrs(*vScope, pos, "while evaluating the first argument passed to builtins.scopedImport");
Env * env = &state.allocEnv(vScope->attrs()->size());
env->up = &state.baseEnv;
auto staticEnv = std::make_shared<StaticEnv>(nullptr, state.staticBaseEnv.get(), vScope->attrs()->size());
unsigned int displ = 0;
for (auto & attr : *vScope->attrs()) {
staticEnv->vars.emplace_back(attr.name, displ);
env->values[displ++] = attr.value;
}
// No need to call staticEnv.sort(), because
// args[0]->attrs is already sorted.
printTalkative("evaluating file '%1%'", path);
Expr * e = state.parseExprFromFile(resolveExprPath(path), staticEnv);
e->eval(state, *env, v);
}
/* Load and evaluate an expression from path specified by the
argument. */
static void import(EvalState & state, const PosIdx pos, Value & vPath, Value * vScope, Value & v)
@ -226,30 +258,10 @@ static void import(EvalState & state, const PosIdx pos, Value & vPath, Value * v
}
else {
if (!vScope)
if (vScope)
scopedImport(state, pos, path, vScope, v);
else
state.evalFile(path, v);
else {
state.forceAttrs(*vScope, pos, "while evaluating the first argument passed to builtins.scopedImport");
Env * env = &state.allocEnv(vScope->attrs()->size());
env->up = &state.baseEnv;
auto staticEnv = std::make_shared<StaticEnv>(nullptr, state.staticBaseEnv.get(), vScope->attrs()->size());
unsigned int displ = 0;
for (auto & attr : *vScope->attrs()) {
staticEnv->vars.emplace_back(attr.name, displ);
env->values[displ++] = attr.value;
}
// No need to call staticEnv.sort(), because
// args[0]->attrs is already sorted.
printTalkative("evaluating file '%1%'", path);
Expr * e = state.parseExprFromFile(resolveExprPath(path), staticEnv);
e->eval(state, *env, v);
}
}
}