diff options
| -rw-r--r-- | src/libexpr/eval.cc | 20 | ||||
| -rw-r--r-- | src/libexpr/nixexpr.cc | 21 | ||||
| -rw-r--r-- | src/libexpr/nixexpr.hh | 13 | ||||
| -rw-r--r-- | src/libexpr/parser.y | 142 |
4 files changed, 68 insertions, 128 deletions
diff --git a/src/libexpr/eval.cc b/src/libexpr/eval.cc index cd3edecaa738..3d8ee9934016 100644 --- a/src/libexpr/eval.cc +++ b/src/libexpr/eval.cc @@ -129,6 +129,18 @@ string showType(const Value & v) } +Symbol getName(const AttrName & name, EvalState & state, Env & env) { + if (name.symbol.set()) { + return name.symbol; + } else { + Value nameValue; + name.expr->eval(state, env, nameValue); + state.forceStringNoCtx(nameValue); + return state.symbols.create(nameValue.string.s); + } +} + + EvalState::EvalState() : sWith(symbols.create("<with>")) , sOutPath(symbols.create("outPath")) @@ -683,17 +695,18 @@ void ExprSelect::eval(EvalState & state, Env & env, Value & v) foreach (AttrPath::const_iterator, i, attrPath) { nrLookups++; Bindings::iterator j; + Symbol name = getName(*i, state, env); if (def) { state.forceValue(*vAttrs); if (vAttrs->type != tAttrs || - (j = vAttrs->attrs->find(*i)) == vAttrs->attrs->end()) + (j = vAttrs->attrs->find(name)) == vAttrs->attrs->end()) { def->eval(state, env, v); return; } } else { state.forceAttrs(*vAttrs); - if ((j = vAttrs->attrs->find(*i)) == vAttrs->attrs->end()) + if ((j = vAttrs->attrs->find(name)) == vAttrs->attrs->end()) throwEvalError("attribute `%1%' missing", showAttrPath(attrPath)); } vAttrs = j->value; @@ -724,8 +737,9 @@ void ExprOpHasAttr::eval(EvalState & state, Env & env, Value & v) foreach (AttrPath::const_iterator, i, attrPath) { state.forceValue(*vAttrs); Bindings::iterator j; + Symbol name = getName(*i, state, env); if (vAttrs->type != tAttrs || - (j = vAttrs->attrs->find(*i)) == vAttrs->attrs->end()) + (j = vAttrs->attrs->find(name)) == vAttrs->attrs->end()) { mkBool(v, false); return; diff --git a/src/libexpr/nixexpr.cc b/src/libexpr/nixexpr.cc index a7ce58c4d9d9..9f0bc2630ddc 100644 --- a/src/libexpr/nixexpr.cc +++ b/src/libexpr/nixexpr.cc @@ -155,12 +155,19 @@ std::ostream & operator << (std::ostream & str, const Pos & pos) string showAttrPath(const AttrPath & attrPath) { - string s; + std::ostringstream out; + bool first = true; foreach (AttrPath::const_iterator, i, attrPath) { - if (!s.empty()) s += '.'; - s += *i; + if (!first) + out << '.'; + else + first = false; + if (i->symbol.set()) + out << i->symbol; + else + out << "\"${" << *i->expr << "}\""; } - return s; + return out.str(); } @@ -220,11 +227,17 @@ void ExprSelect::bindVars(const StaticEnv & env) { e->bindVars(env); if (def) def->bindVars(env); + foreach (AttrPath::iterator, i, attrPath) + if (!i->symbol.set()) + i->expr->bindVars(env); } void ExprOpHasAttr::bindVars(const StaticEnv & env) { e->bindVars(env); + foreach (AttrPath::iterator, i, attrPath) + if (!i->symbol.set()) + i->expr->bindVars(env); } void ExprAttrs::bindVars(const StaticEnv & env) diff --git a/src/libexpr/nixexpr.hh b/src/libexpr/nixexpr.hh index 92c2ca8dc56e..bc6993477c48 100644 --- a/src/libexpr/nixexpr.hh +++ b/src/libexpr/nixexpr.hh @@ -50,10 +50,19 @@ struct Env; struct Value; struct EvalState; struct StaticEnv; +struct Expr; /* An attribute path is a sequence of attribute names. */ -typedef vector<Symbol> AttrPath; +struct AttrName +{ + Symbol symbol; + Expr *expr; + AttrName(const Symbol & s) : symbol(s) {}; + AttrName(Expr *e) : expr(e) {}; +}; + +typedef std::vector<AttrName> AttrPath; string showAttrPath(const AttrPath & attrPath); @@ -138,7 +147,7 @@ struct ExprSelect : Expr 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(name); }; + ExprSelect(Expr * e, const Symbol & name) : e(e), def(0) { attrPath.push_back(AttrName(name)); }; COMMON_METHODS }; diff --git a/src/libexpr/parser.y b/src/libexpr/parser.y index 3bee3b010cf6..28972cf72416 100644 --- a/src/libexpr/parser.y +++ b/src/libexpr/parser.y @@ -39,15 +39,6 @@ namespace nix { { }; }; - struct AttrName - { - Symbol symbol; - Expr *expr; - AttrName(const Symbol & s) : symbol(s) {}; - AttrName(Expr *e) : expr(e) {}; - }; - - typedef std::vector<AttrName> AttrNames; } #define YY_DECL int yylex \ @@ -83,32 +74,28 @@ static void dupAttr(const AttrPath & attrPath, const Pos & pos, const Pos & prev static void dupAttr(Symbol attr, const Pos & pos, const Pos & prevPos) { - AttrPath attrPath; attrPath.push_back(attr); throw ParseError(format("attribute `%1%' at %2% already defined at %3%") - % showAttrPath(attrPath) % pos % prevPos); + % attr % pos % prevPos); } -static void addAttr(ExprAttrs * attrs, AttrNames & attrNames, +static void addAttr(ExprAttrs * attrs, AttrPath & attrPath, Expr * e, const Pos & pos) { - AttrPath path; - AttrNames::iterator i; + AttrPath::iterator i; // All attrpaths have at least one attr - assert(!attrNames.empty()); - for (i = attrNames.begin(); i + 1 < attrNames.end(); i++) { + assert(!attrPath.empty()); + for (i = attrPath.begin(); i + 1 < attrPath.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); + if (!attrs2) dupAttr(attrPath, pos, j->second.pos); attrs = attrs2; } else - dupAttr(path, pos, j->second.pos); + dupAttr(attrPath, pos, j->second.pos); } else { - path.clear(); ExprAttrs * nested = new ExprAttrs; attrs->attrs[i->symbol] = ExprAttrs::AttrDef(nested, pos); attrs = nested; @@ -122,7 +109,7 @@ static void addAttr(ExprAttrs * attrs, AttrNames & attrNames, if (i->symbol.set()) { ExprAttrs::AttrDefs::iterator j = attrs->attrs.find(i->symbol); if (j != attrs->attrs.end()) { - dupAttr(path, pos, j->second.pos); + dupAttr(attrPath, pos, j->second.pos); } else { attrs->attrs[i->symbol] = ExprAttrs::AttrDef(e, pos); e->setName(i->symbol); @@ -268,8 +255,7 @@ void yyerror(YYLTYPE * loc, yyscan_t scanner, ParseData * data, const char * err char * id; // !!! -> Symbol char * path; char * uri; - std::vector<nix::AttrName> * attrpath; - std::vector<nix::Symbol> * attrlist; + std::vector<nix::AttrName> * attrNames; std::vector<nix::Expr *> * string_parts; } @@ -279,8 +265,7 @@ void yyerror(YYLTYPE * loc, yyscan_t scanner, ParseData * data, const char * err %type <attrs> binds %type <formals> formals %type <formal> formal -%type <attrpath> attrpath -%type <attrlist> attrs +%type <attrNames> attrs attrpath %type <string_parts> string_parts_interpolated ind_string_parts %type <e> string_parts string_attr %type <id> attr @@ -354,39 +339,7 @@ expr_op | expr_op OR expr_op { $$ = new ExprOpOr($1, $3); } | expr_op IMPL expr_op { $$ = new ExprOpImpl($1, $3); } | expr_op UPDATE expr_op { $$ = new ExprOpUpdate($1, $3); } - | expr_op '?' attrpath - { AttrPath path; - vector<AttrName>::iterator i; - $$ = $1; - // All attrpaths have at least one attr - assert(!$3->empty()); - for (i = $3->begin(); i + 1 != $3->end(); i++) { - if (i->symbol.set()) { - path.push_back(i->symbol); - } else { - if (!path.empty()) { - $$ = new ExprSelect($$, path, new ExprAttrs()); - path.clear(); - } - $$ = new ExprIf( - new ExprOpAnd( - new ExprApp(new ExprBuiltin(data->symbols.create("isAttrs")), $$), - new ExprApp(new ExprApp(new ExprBuiltin(data->symbols.create("hasAttr")), i->expr), $$)), - new ExprApp(new ExprApp(new ExprBuiltin(data->symbols.create("getAttr")), i->expr), $$), - new ExprAttrs()); - } - } - if (i->symbol.set()) { - path.push_back(i->symbol); - $$ = new ExprOpHasAttr($$, path); - } else { - if (!path.empty()) - $$ = new ExprSelect($$, path, new ExprAttrs()); - $$ = new ExprOpAnd( - new ExprApp(new ExprBuiltin(data->symbols.create("isAttrs")), $$), - new ExprApp(new ExprApp(new ExprBuiltin(data->symbols.create("hasAttr")), i->expr), $$)); - } - } + | expr_op '?' attrpath { $$ = new ExprOpHasAttr($1, *$3); } | expr_op '+' expr_op { vector<Expr *> * l = new vector<Expr *>; l->push_back($1); @@ -408,58 +361,9 @@ expr_app expr_select : expr_simple '.' attrpath - { AttrPath path; - $$ = $1; - foreach (vector<AttrName>::iterator, i, *$3) { - if (i->symbol.set()) { - path.push_back(i->symbol); - } else { - if (!path.empty()) { - $$ = new ExprSelect($$, path, 0); - path.clear(); - } - $$ = new ExprApp(new ExprApp(new ExprBuiltin(data->symbols.create("getAttr")), i->expr), $$); - } - } - if (!path.empty()) - $$ = new ExprSelect($$, path, 0); - } + { $$ = new ExprSelect($1, *$3, 0); } | expr_simple '.' attrpath OR_KW expr_select - { AttrPath path; - vector<AttrName>::iterator i; - $$ = $1; - // All attrpaths have at least one attr - assert(!$3->empty()); - for (i = $3->begin(); i + 1 != $3->end(); i++) { - if (i->symbol.set()) { - path.push_back(i->symbol); - } else { - if (!path.empty()) { - $$ = new ExprSelect($$, path, new ExprAttrs()); - path.clear(); - } - $$ = new ExprIf( - new ExprOpAnd( - new ExprApp(new ExprBuiltin(data->symbols.create("isAttrs")), $$), - new ExprApp(new ExprApp(new ExprBuiltin(data->symbols.create("hasAttr")), i->expr), $$)), - new ExprApp(new ExprApp(new ExprBuiltin(data->symbols.create("getAttr")), i->expr), $$), - new ExprAttrs()); - } - } - if (i->symbol.set()) { - path.push_back(i->symbol); - $$ = new ExprSelect($$, path, $5); - } else { - if (!path.empty()) - $$ = new ExprSelect($$, path, new ExprAttrs()); - $$ = new ExprIf( - new ExprOpAnd( - new ExprApp(new ExprBuiltin(data->symbols.create("isAttrs")), $$), - new ExprApp(new ExprApp(new ExprBuiltin(data->symbols.create("hasAttr")), i->expr), $$)), - new ExprApp(new ExprApp(new ExprBuiltin(data->symbols.create("getAttr")), i->expr), $$), - $5); - } - } + { $$ = 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 @@ -542,37 +446,37 @@ binds | binds INHERIT attrs ';' { $$ = $1; foreach (AttrPath::iterator, i, *$3) { - if ($$->attrs.find(*i) != $$->attrs.end()) - dupAttr(*i, makeCurPos(@3, data), $$->attrs[*i].pos); + if ($$->attrs.find(i->symbol) != $$->attrs.end()) + dupAttr(i->symbol, makeCurPos(@3, data), $$->attrs[i->symbol].pos); Pos pos = makeCurPos(@3, data); - $$->attrs[*i] = ExprAttrs::AttrDef(new ExprVar(CUR_POS, *i), pos, true); + $$->attrs[i->symbol] = ExprAttrs::AttrDef(new ExprVar(CUR_POS, i->symbol), pos, true); } } | binds INHERIT '(' expr ')' attrs ';' { $$ = $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)); + 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)); } } | { $$ = new ExprAttrs; } ; attrs - : attrs attr { $$ = $1; $1->push_back(data->symbols.create($2)); /* !!! dangerous */ } + : attrs attr { $$ = $1; $1->push_back(AttrName(data->symbols.create($2))); } | attrs string_attr { $$ = $1; ExprString *str = dynamic_cast<ExprString *>($2); if (str) { - $$->push_back(str->s); + $$->push_back(AttrName(str->s)); delete str; } else throw ParseError(format("dynamic attributes not allowed in inherit at %1%") % makeCurPos(@2, data)); } - | { $$ = new vector<Symbol>; } + | { $$ = new AttrPath; } ; attrpath |