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* Implemented derivations.

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This commit is contained in:
Eelco Dolstra 2010-03-31 15:38:03 +00:00
parent 5187678913
commit 3d94be61ea
6 changed files with 183 additions and 192 deletions
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41
src/libexpr/eval.cc
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@ -261,6 +261,14 @@ void EvalState::mkAttrs(Value & v)
}
void EvalState::cloneAttrs(Value & src, Value & dst)
{
mkAttrs(dst);
foreach (Bindings::iterator, i, *src.attrs)
(*dst.attrs)[i->first] = i->second; // !!! sharing?
}
void EvalState::evalFile(const Path & path, Value & v)
{
startNest(nest, lvlTalkative, format("evaluating file `%1%'") % path);
@ -488,17 +496,14 @@ void EvalState::eval(Env & env, Expr e, Value & v)
/* Attribute set update (//). */
else if (matchOpUpdate(e, e1, e2)) {
mkAttrs(v);
Value v2;
eval(env, e1, v2);
cloneAttrs(v2, v);
eval(env, e2, v2);
foreach (Bindings::iterator, i, *v2.attrs)
(*v.attrs)[i->first] = i->second;
eval(env, e1, v2);
foreach (Bindings::iterator, i, *v2.attrs)
if (v.attrs->find(i->first) == v.attrs->end())
(*v.attrs)[i->first] = i->second;
(*v.attrs)[i->first] = i->second; // !!! sharing
}
/* Attribute existence test (?). */
@ -673,6 +678,15 @@ int EvalState::forceInt(Value & v)
}
bool EvalState::forceBool(Value & v)
{
forceValue(v);
if (v.type != tBool)
throw TypeError(format("value is %1% while a Boolean was expected") % showType(v));
return v.boolean;
}
void EvalState::forceAttrs(Value & v)
{
forceValue(v);
@ -697,15 +711,22 @@ void EvalState::forceFunction(Value & v)
}
string EvalState::forceStringNoCtx(Value & v)
string EvalState::forceString(Value & v)
{
forceValue(v);
if (v.type != tString)
throw TypeError(format("value is %1% while a string was expected") % showType(v));
return string(v.string.s);
}
string EvalState::forceStringNoCtx(Value & v)
{
string s = forceString(v);
if (v.string.context)
throw EvalError(format("the string `%1%' is not allowed to refer to a store path (such as `%2%')")
% v.string.s % v.string.context[0]);
return string(v.string.s);
return s;
}