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string2Int(): Return std::optional

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This commit is contained in:
Eelco Dolstra 2021-01-08 12:22:21 +01:00
parent 29a445840a
commit 6548b89cc4
17 changed files with 82 additions and 69 deletions
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14
src/libexpr/attr-path.cc
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@ -52,9 +52,7 @@ std::pair<Value *, Pos> findAlongAttrPath(EvalState & state, const string & attr
for (auto & attr : tokens) {
/* Is i an index (integer) or a normal attribute name? */
enum { apAttr, apIndex } apType = apAttr;
unsigned int attrIndex;
if (string2Int(attr, attrIndex)) apType = apIndex;
auto attrIndex = string2Int<unsigned int>(attr);
/* Evaluate the expression. */
Value * vNew = state.allocValue();
@ -65,7 +63,7 @@ std::pair<Value *, Pos> findAlongAttrPath(EvalState & state, const string & attr
/* It should evaluate to either a set or an expression,
according to what is specified in the attrPath. */
if (apType == apAttr) {
if (!attrIndex) {
if (v->type() != nAttrs)
throw TypeError(
@ -82,17 +80,17 @@ std::pair<Value *, Pos> findAlongAttrPath(EvalState & state, const string & attr
pos = *a->pos;
}
else if (apType == apIndex) {
else {
if (!v->isList())
throw TypeError(
"the expression selected by the selection path '%1%' should be a list but is %2%",
attrPath,
showType(*v));
if (attrIndex >= v->listSize())
throw AttrPathNotFound("list index %1% in selection path '%2%' is out of range", attrIndex, attrPath);
if (*attrIndex >= v->listSize())
throw AttrPathNotFound("list index %1% in selection path '%2%' is out of range", *attrIndex, attrPath);
v = v->listElems()[attrIndex];
v = v->listElems()[*attrIndex];
pos = noPos;
}