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Show position info in attribute selection errors

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This commit is contained in:
Eelco Dolstra 2014-04-04 22:52:14 +02:00
parent 4c5faad994
commit 8e5fbf4d73
3 changed files with 14 additions and 13 deletions
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14
src/libexpr/eval.cc
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@ -736,7 +736,7 @@ unsigned long nrLookups = 0;
void ExprSelect::eval(EvalState & state, Env & env, Value & v)
{
Value vTmp;
Pos * pos = 0;
Pos * pos2 = 0;
Value * vAttrs = &vTmp;
e->eval(state, env, vTmp);
@ -756,21 +756,21 @@ void ExprSelect::eval(EvalState & state, Env & env, Value & v)
return;
}
} else {
state.forceAttrs(*vAttrs);
state.forceAttrs(*vAttrs, pos);
if ((j = vAttrs->attrs->find(name)) == vAttrs->attrs->end())
throwEvalError("attribute `%1%' missing", showAttrPath(attrPath));
throwEvalError("attribute `%1%' missing, at %2%", showAttrPath(attrPath), pos);
}
vAttrs = j->value;
pos = j->pos;
if (state.countCalls && pos) state.attrSelects[*pos]++;
pos2 = j->pos;
if (state.countCalls && pos2) state.attrSelects[*pos2]++;
}
state.forceValue(*vAttrs);
} catch (Error & e) {
if (pos && pos->file != state.sDerivationNix)
if (pos2 && pos2->file != state.sDerivationNix)
addErrorPrefix(e, "while evaluating the attribute `%1%' at %2%:\n",
showAttrPath(attrPath), *pos);
showAttrPath(attrPath), *pos2);
throw;
}

5
src/libexpr/nixexpr.hh
View file

@ -149,10 +149,11 @@ struct ExprVar : Expr
struct ExprSelect : Expr
{
Pos pos;
Expr * e, * def;
AttrPath attrPath;
ExprSelect(Expr * e, const AttrPath & attrPath, Expr * def) : e(e), def(def), attrPath(attrPath) { };
ExprSelect(Expr * e, const Symbol & name) : e(e), def(0) { attrPath.push_back(AttrName(name)); };
ExprSelect(const Pos & pos, Expr * e, const AttrPath & attrPath, Expr * def) : pos(pos), e(e), def(def), attrPath(attrPath) { };
ExprSelect(const Pos & pos, Expr * e, const Symbol & name) : pos(pos), e(e), def(0) { attrPath.push_back(AttrName(name)); };
COMMON_METHODS
};

8
src/libexpr/parser.y
View file

@ -361,9 +361,9 @@ expr_app
expr_select
: expr_simple '.' attrpath
{ $$ = new ExprSelect($1, *$3, 0); }
{ $$ = new ExprSelect(CUR_POS, $1, *$3, 0); }
| expr_simple '.' attrpath OR_KW expr_select
{ $$ = new ExprSelect($1, *$3, $5); }
{ $$ = new ExprSelect(CUR_POS, $1, *$3, $5); }
| /* Backwards compatibility: because Nixpkgs has a rarely used
function named ‘or’, allow stuff like ‘map or [...]’. */
expr_simple OR_KW
@ -403,7 +403,7 @@ expr_simple
/* Let expressions `let {..., body = ...}' are just desugared
into `(rec {..., body = ...}).body'. */
| LET '{' binds '}'
{ $3->recursive = true; $$ = new ExprSelect($3, data->symbols.create("body")); }
{ $3->recursive = true; $$ = new ExprSelect(noPos, $3, data->symbols.create("body")); }
| REC '{' binds '}'
{ $3->recursive = true; $$ = $3; }
| '{' binds '}'
@ -458,7 +458,7 @@ binds
foreach (AttrPath::iterator, i, *$6) {
if ($$->attrs.find(i->symbol) != $$->attrs.end())
dupAttr(i->symbol, makeCurPos(@6, data), $$->attrs[i->symbol].pos);
$$->attrs[i->symbol] = ExprAttrs::AttrDef(new ExprSelect($4, i->symbol), makeCurPos(@6, data));
$$->attrs[i->symbol] = ExprAttrs::AttrDef(new ExprSelect(CUR_POS, $4, i->symbol), makeCurPos(@6, data));
}
}
| { $$ = new ExprAttrs; }