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Fold dynamic binds handling into addAttr 

Since addAttr has to iterate through the AttrPath we pass it, it makes
more sense to just iterate through the AttrNames in addAttr instead. As
an added bonus, this allows attrsets where two dynamic attribute paths
have the same static leading part (see added test case for an example
that failed previously).

Signed-off-by: Shea Levy <shea@shealevy.com>
This commit is contained in:
Shea Levy 2013-12-31 17:57:10 -05:00
parent 18fefacf7d
commit 6f3a51809a
3 changed files with 37 additions and 55 deletions
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90
src/libexpr/parser.y
View File

@ -89,31 +89,47 @@ static void dupAttr(Symbol attr, const Pos & pos, const Pos & prevPos)
}
static void addAttr(ExprAttrs * attrs, AttrPath & attrPath,
static void addAttr(ExprAttrs * attrs, AttrNames & attrNames,
Expr * e, const Pos & pos)
{
unsigned int n = 0;
foreach (AttrPath::const_iterator, i, attrPath) {
n++;
ExprAttrs::AttrDefs::iterator j = attrs->attrs.find(*i);
if (j != attrs->attrs.end()) {
if (!j->second.inherited) {
ExprAttrs * attrs2 = dynamic_cast<ExprAttrs *>(j->second.e);
if (!attrs2 || n == attrPath.size()) dupAttr(attrPath, pos, j->second.pos);
attrs = attrs2;
} else
dupAttr(attrPath, pos, j->second.pos);
} else {
if (n == attrPath.size())
attrs->attrs[*i] = ExprAttrs::AttrDef(e, pos);
else {
AttrPath path;
AttrNames::iterator i;
// All attrpaths have at least one attr
assert(!attrNames.empty());
for (i = attrNames.begin(); i + 1 < attrNames.end(); i++) {
if (i->symbol.set()) {
path.push_back(i->symbol);
ExprAttrs::AttrDefs::iterator j = attrs->attrs.find(i->symbol);
if (j != attrs->attrs.end()) {
if (!j->second.inherited) {
ExprAttrs * attrs2 = dynamic_cast<ExprAttrs *>(j->second.e);
if (!attrs2) dupAttr(path, pos, j->second.pos);
attrs = attrs2;
} else
dupAttr(path, pos, j->second.pos);
} else {
path.clear();
ExprAttrs * nested = new ExprAttrs;
attrs->attrs[*i] = ExprAttrs::AttrDef(nested, pos);
attrs->attrs[i->symbol] = ExprAttrs::AttrDef(nested, pos);
attrs = nested;
}
} else {
ExprAttrs *nested = new ExprAttrs;
attrs->dynamicAttrs.push_back(ExprAttrs::DynamicAttrDef(i->expr, nested, pos));
attrs = nested;
}
}
e->setName(attrPath.back());
if (i->symbol.set()) {
ExprAttrs::AttrDefs::iterator j = attrs->attrs.find(i->symbol);
if (j != attrs->attrs.end()) {
dupAttr(path, pos, j->second.pos);
} else {
attrs->attrs[i->symbol] = ExprAttrs::AttrDef(e, pos);
e->setName(i->symbol);
}
} else {
attrs->dynamicAttrs.push_back(ExprAttrs::DynamicAttrDef(i->expr, e, pos));
}
}
@ -522,43 +538,7 @@ ind_string_parts
;
binds
: binds attrpath '=' expr ';'
{
ExprAttrs *curAttrs = $1;
AttrPath path;
vector<AttrName>::iterator i;
// All attrpaths have at least one attr
assert(!$2->empty());
for (i = $2->begin(); i + 1 < $2->end(); i++) {
if (i->symbol.set()) {
path.push_back(i->symbol);
} else {
ExprAttrs *temp;
if (!path.empty()) {
temp = curAttrs;
curAttrs = new ExprAttrs;
addAttr(temp, path, curAttrs, makeCurPos(@2, data));
}
path.clear();
temp = curAttrs;
curAttrs = new ExprAttrs;
temp->dynamicAttrs.push_back(ExprAttrs::DynamicAttrDef(i->expr, curAttrs, makeCurPos(@2, data)));
}
}
if (i->symbol.set()) {
path.push_back(i->symbol);
addAttr(curAttrs, path, $4, makeCurPos(@2, data));
} else {
if (!path.empty()) {
ExprAttrs *temp = curAttrs;
curAttrs = new ExprAttrs;
addAttr(temp, path, curAttrs, makeCurPos(@2, data));
}
curAttrs->dynamicAttrs.push_back(ExprAttrs::DynamicAttrDef(i->expr, $4, makeCurPos(@2, data)));
}
$$ = $1;
}
: binds attrpath '=' expr ';' { $$ = $1; addAttr($$, *$2, $4, makeCurPos(@2, data)); }
| binds INHERIT attrs ';'
{ $$ = $1;
foreach (AttrPath::iterator, i, *$3) {

1
tests/lang/eval-okay-dynamic-attrs-2.exp Normal file
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@ -0,0 +1 @@
true

1
tests/lang/eval-okay-dynamic-attrs-2.nix Normal file
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@ -0,0 +1 @@
{ a."${"b"}" = true; a."${"c"}" = false; }.a.b