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Add splitVersion primop.

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Fixes #1868.
This commit is contained in:
Shea Levy 2018-02-13 18:28:27 -05:00
parent 3fe9767dd3
commit b095c06139
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6 changed files with 37 additions and 1 deletions
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21
src/libexpr/primops.cc
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@ -1961,6 +1961,26 @@ static void prim_compareVersions(EvalState & state, const Pos & pos, Value * * a
}
static void prim_splitVersion(EvalState & state, const Pos & pos, Value * * args, Value & v)
{
string version = state.forceStringNoCtx(*args[0], pos);
auto iter = version.cbegin();
Strings components;
while (iter != version.cend()) {
auto component = nextComponent(iter, version.cend());
if (component.empty())
break;
components.emplace_back(std::move(component));
}
state.mkList(v, components.size());
unsigned int n = 0;
for (auto & component : components) {
auto listElem = v.listElems()[n++] = state.allocValue();
mkString(*listElem, std::move(component));
}
}
/*************************************************************
* Networking
*************************************************************/
@ -2196,6 +2216,7 @@ void EvalState::createBaseEnv()
// Versions
addPrimOp("__parseDrvName", 1, prim_parseDrvName);
addPrimOp("__compareVersions", 2, prim_compareVersions);
addPrimOp("__splitVersion", 1, prim_splitVersion);
// Derivations
addPrimOp("derivationStrict", 1, prim_derivationStrict);