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* Update autoCallFunction() and findAlongAttrPath().

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This commit is contained in:
Eelco Dolstra 2010-04-07 15:47:06 +00:00
parent 9a64454faa
commit af2a372bb0
10 changed files with 120 additions and 188 deletions
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64
src/libexpr/eval.cc
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@ -260,6 +260,12 @@ void EvalState::mkAttrs(Value & v)
}
void EvalState::mkThunk_(Value & v, Expr expr)
{
mkThunk(v, baseEnv, expr);
}
void EvalState::cloneAttrs(Value & src, Value & dst)
{
mkAttrs(dst);
@ -625,6 +631,37 @@ void EvalState::callFunction(Value & fun, Value & arg, Value & v)
}
void EvalState::autoCallFunction(const Bindings & args, Value & fun, Value & res)
{
forceValue(fun);
ATerm name;
ATermList formals;
ATermBool ellipsis;
if (fun.type != tLambda || !matchAttrsPat(fun.lambda.pat, formals, ellipsis, name)) {
res = fun;
return;
}
Value actualArgs;
mkAttrs(actualArgs);
for (ATermIterator i(formals); i; ++i) {
Expr name, def; ATerm def2;
if (!matchFormal(*i, name, def2)) abort();
Bindings::const_iterator j = args.find(name);
if (j != args.end())
(*actualArgs.attrs)[name] = j->second;
else if (!matchDefaultValue(def2, def))
throw TypeError(format("cannot auto-call a function that has an argument without a default value (`%1% ')")
% aterm2String(name));
}
callFunction(fun, actualArgs, res);
}
void EvalState::eval(Expr e, Value & v)
{
eval(baseEnv, e, v);
@ -1058,33 +1095,6 @@ ATermList flattenList(EvalState & state, Expr e)
}
Expr autoCallFunction(Expr e, const ATermMap & args)
{
Pattern pat;
ATerm body, pos, name;
ATermList formals;
ATermBool ellipsis;
if (matchFunction(e, pat, body, pos) && matchAttrsPat(pat, formals, ellipsis, name)) {
ATermMap actualArgs(ATgetLength(formals));
for (ATermIterator i(formals); i; ++i) {
Expr name, def, value; ATerm def2;
if (!matchFormal(*i, name, def2)) abort();
if ((value = args.get(name)))
actualArgs.set(name, makeAttrRHS(value, makeNoPos()));
else if (!matchDefaultValue(def2, def))
throw TypeError(format("cannot auto-call a function that has an argument without a default value (`%1%')")
% aterm2String(name));
}
e = makeCall(e, makeAttrs(actualArgs));
}
return e;
}
/* Evaluation of various language constructs. These have been taken
out of evalExpr2 to reduce stack space usage. (GCC is really dumb
about stack space: it just adds up all the local variables and