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-rw-r--r--src/libexpr/eval.cc19
-rw-r--r--src/libexpr/lexer.l1
-rw-r--r--src/libexpr/nixexpr.cc2
-rw-r--r--src/libexpr/nixexpr.hh6
-rw-r--r--src/libexpr/parser.y36
5 files changed, 43 insertions, 21 deletions
diff --git a/src/libexpr/eval.cc b/src/libexpr/eval.cc
index 4d3a369aa..acf5d7a8a 100644
--- a/src/libexpr/eval.cc
+++ b/src/libexpr/eval.cc
@@ -632,7 +632,6 @@ void ExprVar::eval(EvalState & state, Env & env, Value & v)
unsigned long nrLookups = 0;
-unsigned long nrLookupSize = 0;
void ExprSelect::eval(EvalState & state, Env & env, Value & v)
{
@@ -646,11 +645,20 @@ void ExprSelect::eval(EvalState & state, Env & env, Value & v)
foreach (AttrPath::const_iterator, i, attrPath) {
nrLookups++;
- state.forceAttrs(*vAttrs);
- nrLookupSize += vAttrs->attrs->size();
Bindings::iterator j;
- if ((j = vAttrs->attrs->find(*i)) == vAttrs->attrs->end())
- throwEvalError("attribute `%1%' missing", showAttrPath(attrPath));
+ if (def) {
+ state.forceValue(*vAttrs);
+ if (vAttrs->type != tAttrs ||
+ (j = vAttrs->attrs->find(*i)) == vAttrs->attrs->end())
+ {
+ state.eval(env, def, v);
+ return;
+ }
+ } else {
+ state.forceAttrs(*vAttrs);
+ if ((j = vAttrs->attrs->find(*i)) == vAttrs->attrs->end())
+ throwEvalError("attribute `%1%' missing", showAttrPath(attrPath));
+ }
vAttrs = j->value;
pos = j->pos;
}
@@ -1270,7 +1278,6 @@ void EvalState::printStats()
printMsg(v, format(" number of thunks: %1%") % nrThunks);
printMsg(v, format(" number of thunks avoided: %1%") % nrAvoided);
printMsg(v, format(" number of attr lookups: %1%") % nrLookups);
- printMsg(v, format(" attr lookup size: %1%") % nrLookupSize);
}
diff --git a/src/libexpr/lexer.l b/src/libexpr/lexer.l
index 5b27e2582..330c2bd54 100644
--- a/src/libexpr/lexer.l
+++ b/src/libexpr/lexer.l
@@ -96,6 +96,7 @@ let { return LET; }
in { return IN; }
rec { return REC; }
inherit { return INHERIT; }
+or { return OR_KW; }
\.\.\. { return ELLIPSIS; }
\=\= { return EQ; }
diff --git a/src/libexpr/nixexpr.cc b/src/libexpr/nixexpr.cc
index 2632d9f3f..c52a41391 100644
--- a/src/libexpr/nixexpr.cc
+++ b/src/libexpr/nixexpr.cc
@@ -44,6 +44,7 @@ void ExprVar::show(std::ostream & str)
void ExprSelect::show(std::ostream & str)
{
str << "(" << *e << ")." << showAttrPath(attrPath);
+ if (def) str << " or " << *def;
}
void ExprOpHasAttr::show(std::ostream & str)
@@ -211,6 +212,7 @@ void ExprVar::bindVars(const StaticEnv & env)
void ExprSelect::bindVars(const StaticEnv & env)
{
e->bindVars(env);
+ if (def) def->bindVars(env);
}
void ExprOpHasAttr::bindVars(const StaticEnv & env)
diff --git a/src/libexpr/nixexpr.hh b/src/libexpr/nixexpr.hh
index 725e30c6f..166289b29 100644
--- a/src/libexpr/nixexpr.hh
+++ b/src/libexpr/nixexpr.hh
@@ -121,10 +121,10 @@ struct ExprVar : Expr
struct ExprSelect : Expr
{
- Expr * e;
+ Expr * e, * def;
AttrPath attrPath;
- ExprSelect(Expr * e, const AttrPath & attrPath) : e(e), attrPath(attrPath) { };
- ExprSelect(Expr * e, const Symbol & name) : e(e) { attrPath.push_back(name); };
+ 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(name); };
COMMON_METHODS
};
diff --git a/src/libexpr/parser.y b/src/libexpr/parser.y
index 49bd7bfa5..ec194a516 100644
--- a/src/libexpr/parser.y
+++ b/src/libexpr/parser.y
@@ -237,7 +237,7 @@ void yyerror(YYLTYPE * loc, yyscan_t scanner, ParseData * data, const char * err
char * id; // !!! -> Symbol
char * path;
char * uri;
- std::vector<nix::Symbol> * ids;
+ std::vector<nix::Symbol> * attrNames;
std::vector<nix::Expr *> * string_parts;
}
@@ -247,14 +247,15 @@ void yyerror(YYLTYPE * loc, yyscan_t scanner, ParseData * data, const char * err
%type <attrs> binds
%type <formals> formals
%type <formal> formal
-%type <ids> ids attrpath
+%type <attrNames> attrs attrpath
%type <string_parts> string_parts ind_string_parts
+%type <id> attr
%token <id> ID ATTRPATH
%token <e> STR IND_STR
%token <n> INT
%token <path> PATH
%token <uri> URI
-%token IF THEN ELSE ASSERT WITH LET IN REC INHERIT EQ NEQ AND OR IMPL
+%token IF THEN ELSE ASSERT WITH LET IN REC INHERIT EQ NEQ AND OR IMPL OR_KW
%token DOLLAR_CURLY /* == ${ */
%token IND_STRING_OPEN IND_STRING_CLOSE
%token ELLIPSIS
@@ -326,7 +327,13 @@ expr_app
expr_select
: expr_simple '.' attrpath
- { $$ = new ExprSelect($1, *$3); }
+ { $$ = new ExprSelect($1, *$3, 0); }
+ | expr_simple '.' attrpath OR_KW expr_select
+ { $$ = new ExprSelect($1, *$3, $5); }
+ | /* Backwards compatibility: because Nixpkgs has a rarely used
+ function named ‘or’, allow stuff like ‘map or [...]’. */
+ expr_simple OR_KW
+ { $$ = new ExprApp($1, new ExprVar(data->symbols.create("or"))); }
| expr_simple { $$ = $1; }
;
@@ -370,7 +377,7 @@ ind_string_parts
binds
: binds attrpath '=' expr ';' { $$ = $1; addAttr($$, *$2, $4, makeCurPos(@2, data)); }
- | binds INHERIT ids ';'
+ | binds INHERIT attrs ';'
{ $$ = $1;
foreach (AttrPath::iterator, i, *$3) {
if ($$->attrs.find(*i) != $$->attrs.end())
@@ -379,26 +386,31 @@ binds
$$->attrs[*i] = ExprAttrs::AttrDef(*i, pos);
}
}
- | binds INHERIT '(' expr ')' ids ';'
+ | binds INHERIT '(' expr ')' attrs ';'
{ $$ = $1;
/* !!! Should ensure sharing of the expression in $4. */
foreach (vector<Symbol>::iterator, i, *$6) {
if ($$->attrs.find(*i) != $$->attrs.end())
dupAttr(*i, makeCurPos(@6, data), $$->attrs[*i].pos);
$$->attrs[*i] = ExprAttrs::AttrDef(new ExprSelect($4, *i), makeCurPos(@6, data));
- }}
-
+ }
+ }
| { $$ = new ExprAttrs; }
;
-ids
- : ids ID { $$ = $1; $1->push_back(data->symbols.create($2)); /* !!! dangerous */ }
+attrs
+ : attrs attr { $$ = $1; $1->push_back(data->symbols.create($2)); /* !!! dangerous */ }
| { $$ = new vector<Symbol>; }
;
attrpath
- : attrpath '.' ID { $$ = $1; $1->push_back(data->symbols.create($3)); }
- | ID { $$ = new vector<Symbol>; $$->push_back(data->symbols.create($1)); }
+ : attrpath '.' attr { $$ = $1; $1->push_back(data->symbols.create($3)); }
+ | attr { $$ = new vector<Symbol>; $$->push_back(data->symbols.create($1)); }
+ ;
+
+attr
+ : ID { $$ = $1; }
+ | OR_KW { $$ = "or"; }
;
expr_list
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-22 20:19:12 +0000