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* Don't use ATerms for the abstract syntax trees anymore. Not

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finished yet.
This commit is contained in:
Eelco Dolstra 2010-04-12 18:30:11 +00:00
parent ed711f73bc
commit 4d6ad5be17
19 changed files with 693 additions and 579 deletions
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15
src/libexpr/Makefile.am
View file

@ -8,15 +8,15 @@ libexpr_la_SOURCES = \
pkginclude_HEADERS = \ pkginclude_HEADERS = \
nixexpr.hh eval.hh parser.hh lexer-tab.hh parser-tab.hh \ nixexpr.hh eval.hh parser.hh lexer-tab.hh parser-tab.hh \
get-drvs.hh attr-path.hh value-to-xml.hh common-opts.hh \ get-drvs.hh attr-path.hh value-to-xml.hh common-opts.hh \
names.hh nixexpr-ast.hh names.hh
libexpr_la_LIBADD = ../libutil/libutil.la ../libstore/libstore.la \ libexpr_la_LIBADD = ../libutil/libutil.la ../libstore/libstore.la \
../boost/format/libformat.la ../boost/format/libformat.la
BUILT_SOURCES = nixexpr-ast.cc nixexpr-ast.hh \ BUILT_SOURCES = \
parser-tab.hh lexer-tab.hh parser-tab.cc lexer-tab.cc parser-tab.hh lexer-tab.hh parser-tab.cc lexer-tab.cc
EXTRA_DIST = lexer.l parser.y nixexpr-ast.def nixexpr-ast.cc EXTRA_DIST = lexer.l parser.y
AM_CXXFLAGS = \ AM_CXXFLAGS = \
-I$(srcdir)/.. ${aterm_include} \ -I$(srcdir)/.. ${aterm_include} \
@ -34,15 +34,6 @@ lexer-tab.cc lexer-tab.hh: lexer.l
$(flex) --outfile lexer-tab.cc --header-file=lexer-tab.hh $(srcdir)/lexer.l $(flex) --outfile lexer-tab.cc --header-file=lexer-tab.hh $(srcdir)/lexer.l
# ATerm helper function generation.
nixexpr-ast.cc nixexpr-ast.hh: ../aterm-helper.pl nixexpr-ast.def
$(perl) $(srcdir)/../aterm-helper.pl nixexpr-ast.hh nixexpr-ast.cc < $(srcdir)/nixexpr-ast.def
CLEANFILES =
# SDF stuff (not built by default). # SDF stuff (not built by default).
nix.tbl: nix.sdf nix.tbl: nix.sdf
sdf2table -m Nix -s -i nix.sdf -o nix.tbl sdf2table -m Nix -s -i nix.sdf -o nix.tbl

5
src/libexpr/attr-path.cc
View file

@ -1,5 +1,4 @@
#include "attr-path.hh" #include "attr-path.hh"
#include "nixexpr-ast.hh"
#include "util.hh" #include "util.hh"
@ -7,7 +6,7 @@ namespace nix {
void findAlongAttrPath(EvalState & state, const string & attrPath, void findAlongAttrPath(EvalState & state, const string & attrPath,
const Bindings & autoArgs, Expr e, Value & v) const Bindings & autoArgs, Expr * e, Value & v)
{ {
Strings tokens = tokenizeString(attrPath, "."); Strings tokens = tokenizeString(attrPath, ".");
@ -46,7 +45,7 @@ void findAlongAttrPath(EvalState & state, const string & attrPath,
format("the expression selected by the selection path `%1%' should be an attribute set but is %2%") format("the expression selected by the selection path `%1%' should be an attribute set but is %2%")
% curPath % showType(v)); % curPath % showType(v));
Bindings::iterator a = v.attrs->find(toATerm(attr)); Bindings::iterator a = v.attrs->find(attr);
if (a == v.attrs->end()) if (a == v.attrs->end())
throw Error(format("attribute `%1%' in selection path `%2%' not found") % attr % curPath); throw Error(format("attribute `%1%' in selection path `%2%' not found") % attr % curPath);
v = a->second; v = a->second;

2
src/libexpr/attr-path.hh
View file

@ -11,7 +11,7 @@ namespace nix {
void findAlongAttrPath(EvalState & state, const string & attrPath, void findAlongAttrPath(EvalState & state, const string & attrPath,
const Bindings & autoArgs, Expr e, Value & v); const Bindings & autoArgs, Expr * e, Value & v);
} }

4
src/libexpr/common-opts.cc
View file

@ -20,10 +20,10 @@ bool parseOptionArg(const string & arg, Strings::iterator & i,
if (i == argsEnd) throw error; if (i == argsEnd) throw error;
string value = *i++; string value = *i++;
Value & v(autoArgs[toATerm(name)]); Value & v(autoArgs[name]);
if (arg == "--arg") if (arg == "--arg")
state.mkThunk_(v, parseExprFromString(state, value, absPath("."))); state.mkThunk_(v, parseExprFromString(value, absPath(".")));
else else
mkString(v, value); mkString(v, value);

22
src/libexpr/eval-test.cc
View file

@ -2,8 +2,8 @@
#include "parser.hh" #include "parser.hh"
#include "hash.hh" #include "hash.hh"
#include "util.hh" #include "util.hh"
#include "nixexpr-ast.hh"
#include <iostream>
#include <cstdlib> #include <cstdlib>
#include <cstring> #include <cstring>
@ -12,8 +12,8 @@ using namespace nix;
void doTest(EvalState & state, string s) void doTest(EvalState & state, string s)
{ {
Expr e = parseExprFromString(state, s, absPath(".")); Expr * e = parseExprFromString(s, absPath("."));
printMsg(lvlError, format(">>>>> %1%") % e); std::cerr << ">>>>> " << *e << std::endl;
Value v; Value v;
state.eval(e, v); state.eval(e, v);
state.strictForceValue(v); state.strictForceValue(v);
@ -24,8 +24,10 @@ void doTest(EvalState & state, string s)
void run(Strings args) void run(Strings args)
{ {
EvalState state; EvalState state;
printMsg(lvlError, format("size of value: %1% bytes") % sizeof(Value)); printMsg(lvlError, format("size of value: %1% bytes") % sizeof(Value));
printMsg(lvlError, format("size of int AST node: %1% bytes") % sizeof(ExprInt));
printMsg(lvlError, format("size of attrset AST node: %1% bytes") % sizeof(ExprAttrs));
doTest(state, "123"); doTest(state, "123");
doTest(state, "{ x = 1; y = 2; }"); doTest(state, "{ x = 1; y = 2; }");
@ -53,7 +55,7 @@ void run(Strings args)
doTest(state, "let id = x: x; in [1 2] == [(id 1) (id 2)]"); doTest(state, "let id = x: x; in [1 2] == [(id 1) (id 2)]");
doTest(state, "let id = x: x; in [1 2] == [(id 1) (id 3)]"); doTest(state, "let id = x: x; in [1 2] == [(id 1) (id 3)]");
doTest(state, "[1 2] == [3 (let x = x; in x)]"); doTest(state, "[1 2] == [3 (let x = x; in x)]");
doTest(state, "{ x = 1; y.z = 2; } == { y = { z = 2; }; x = 1; }"); //doTest(state, "{ x = 1; y.z = 2; } == { y = { z = 2; }; x = 1; }");
doTest(state, "{ x = 1; y = 2; } == { x = 2; }"); doTest(state, "{ x = 1; y = 2; } == { x = 2; }");
doTest(state, "{ x = [ 1 2 ]; } == { x = [ 1 ] ++ [ 2 ]; }"); doTest(state, "{ x = [ 1 2 ]; } == { x = [ 1 ] ++ [ 2 ]; }");
doTest(state, "1 != 1"); doTest(state, "1 != 1");
@ -63,23 +65,23 @@ void run(Strings args)
doTest(state, "__head [ 1 2 3 ]"); doTest(state, "__head [ 1 2 3 ]");
doTest(state, "__add 1 2"); doTest(state, "__add 1 2");
doTest(state, "null"); doTest(state, "null");
doTest(state, "null"); //doTest(state, "\"foo\"");
doTest(state, "\"foo\""); //doTest(state, "let s = \"bar\"; in \"foo${s}\"");
doTest(state, "let s = \"bar\"; in \"foo${s}\"");
doTest(state, "if true then 1 else 2"); doTest(state, "if true then 1 else 2");
doTest(state, "if false then 1 else 2"); doTest(state, "if false then 1 else 2");
doTest(state, "if false || true then 1 else 2"); doTest(state, "if false || true then 1 else 2");
doTest(state, "let x = x; in if true || x then 1 else 2"); doTest(state, "let x = x; in if true || x then 1 else 2");
doTest(state, "http://nixos.org/");
doTest(state, "/etc/passwd"); doTest(state, "/etc/passwd");
//doTest(state, "import ./foo.nix"); //doTest(state, "import ./foo.nix");
doTest(state, "map (x: __add 1 x) [ 1 2 3 ]"); doTest(state, "map (x: __add 1 x) [ 1 2 3 ]");
doTest(state, "map (builtins.add 1) [ 1 2 3 ]"); doTest(state, "map (builtins.add 1) [ 1 2 3 ]");
doTest(state, "builtins.hasAttr \"x\" { x = 1; }"); //doTest(state, "builtins.hasAttr \"x\" { x = 1; }");
doTest(state, "let x = 1; as = rec { inherit x; y = as.x; }; in as.y"); doTest(state, "let x = 1; as = rec { inherit x; y = as.x; }; in as.y");
doTest(state, "let as = { x = 1; }; bs = rec { inherit (as) x; y = x; }; in bs.y"); doTest(state, "let as = { x = 1; }; bs = rec { inherit (as) x; y = x; }; in bs.y");
doTest(state, "let as = rec { inherit (y) x; y = { x = 1; }; }; in as.x"); doTest(state, "let as = rec { inherit (y) x; y = { x = 1; }; }; in as.x");
doTest(state, "builtins.toXML 123"); doTest(state, "builtins.toXML 123");
doTest(state, "builtins.toXML { a.b = \"x\" + \"y\"; c = [ 1 2 ] ++ [ 3 4 ]; }"); //doTest(state, "builtins.toXML { a.b = \"x\" + \"y\"; c = [ 1 2 ] ++ [ 3 4 ]; }");
state.printStats(); state.printStats();
} }

467
src/libexpr/eval.cc
View file

@ -4,7 +4,6 @@
#include "util.hh" #include "util.hh"
#include "store-api.hh" #include "store-api.hh"
#include "derivations.hh" #include "derivations.hh"
#include "nixexpr-ast.hh"
#include "globals.hh" #include "globals.hh"
#include <cstring> #include <cstring>
@ -45,7 +44,7 @@ std::ostream & operator << (std::ostream & str, Value & v)
case tAttrs: case tAttrs:
str << "{ "; str << "{ ";
foreach (Bindings::iterator, i, *v.attrs) foreach (Bindings::iterator, i, *v.attrs)
str << aterm2String(i->first) << " = " << i->second << "; "; str << i->first << " = " << i->second << "; ";
str << "}"; str << "}";
break; break;
case tList: case tList:
@ -96,8 +95,6 @@ EvalState::EvalState() : baseEnv(allocEnv())
nrValues = nrEnvs = nrEvaluated = recursionDepth = maxRecursionDepth = 0; nrValues = nrEnvs = nrEvaluated = recursionDepth = maxRecursionDepth = 0;
deepestStack = (char *) -1; deepestStack = (char *) -1;
initNixExprHelpers();
createBaseEnv(); createBaseEnv();
allowUnsafeEquality = getEnv("NIX_NO_UNSAFE_EQ", "") == ""; allowUnsafeEquality = getEnv("NIX_NO_UNSAFE_EQ", "") == "";
@ -112,9 +109,9 @@ EvalState::~EvalState()
void EvalState::addConstant(const string & name, Value & v) void EvalState::addConstant(const string & name, Value & v)
{ {
baseEnv.bindings[toATerm(name)] = v; baseEnv.bindings[name] = v;
string name2 = string(name, 0, 2) == "__" ? string(name, 2) : name; string name2 = string(name, 0, 2) == "__" ? string(name, 2) : name;
(*baseEnv.bindings[toATerm("builtins")].attrs)[toATerm(name2)] = v; (*baseEnv.bindings["builtins"].attrs)[name2] = v;
nrValues += 2; nrValues += 2;
} }
@ -126,9 +123,9 @@ void EvalState::addPrimOp(const string & name,
v.type = tPrimOp; v.type = tPrimOp;
v.primOp.arity = arity; v.primOp.arity = arity;
v.primOp.fun = primOp; v.primOp.fun = primOp;
baseEnv.bindings[toATerm(name)] = v; baseEnv.bindings[name] = v;
string name2 = string(name, 0, 2) == "__" ? string(name, 2) : name; string name2 = string(name, 0, 2) == "__" ? string(name, 2) : name;
(*baseEnv.bindings[toATerm("builtins")].attrs)[toATerm(name2)] = v; (*baseEnv.bindings["builtins"].attrs)[name2] = v;
nrValues += 2; nrValues += 2;
} }
@ -212,12 +209,12 @@ void mkPath(Value & v, const char * s)
} }
static Value * lookupWith(Env * env, Sym name) static Value * lookupWith(Env * env, const Sym & name)
{ {
if (!env) return 0; if (!env) return 0;
Value * v = lookupWith(env->up, name); Value * v = lookupWith(env->up, name);
if (v) return v; if (v) return v;
Bindings::iterator i = env->bindings.find(sWith); Bindings::iterator i = env->bindings.find("<with>");
if (i == env->bindings.end()) return 0; if (i == env->bindings.end()) return 0;
Bindings::iterator j = i->second.attrs->find(name); Bindings::iterator j = i->second.attrs->find(name);
if (j != i->second.attrs->end()) return &j->second; if (j != i->second.attrs->end()) return &j->second;
@ -225,7 +222,7 @@ static Value * lookupWith(Env * env, Sym name)
} }
static Value * lookupVar(Env * env, Sym name) static Value * lookupVar(Env * env, const Sym & name)
{ {
/* First look for a regular variable binding for `name'. */ /* First look for a regular variable binding for `name'. */
for (Env * env2 = env; env2; env2 = env2->up) { for (Env * env2 = env; env2; env2 = env2->up) {
@ -251,7 +248,7 @@ static Value * lookupVar(Env * env, Sym name)
} }
#endif #endif
throwEvalError("undefined variable `%1%'", aterm2String(name)); throwEvalError("undefined variable `%1%'", name);
} }
@ -284,7 +281,7 @@ void EvalState::mkAttrs(Value & v)
} }
void EvalState::mkThunk_(Value & v, Expr expr) void EvalState::mkThunk_(Value & v, Expr * expr)
{ {
mkThunk(v, baseEnv, expr); mkThunk(v, baseEnv, expr);
} }
@ -302,11 +299,11 @@ void EvalState::evalFile(const Path & path, Value & v)
{ {
startNest(nest, lvlTalkative, format("evaluating file `%1%'") % path); startNest(nest, lvlTalkative, format("evaluating file `%1%'") % path);
Expr e = parseTrees.get(toATerm(path)); Expr * e = parseTrees[path];
if (!e) { if (!e) {
e = parseExprFromFile(*this, path); e = parseExprFromFile(path);
parseTrees.set(toATerm(path), e); parseTrees[path] = e;
} }
try { try {
@ -334,7 +331,7 @@ struct RecursionCounter
}; };
void EvalState::eval(Env & env, Expr e, Value & v) void EvalState::eval(Env & env, Expr * e, Value & v)
{ {
/* When changing this function, make sure that you don't cause a /* When changing this function, make sure that you don't cause a
(large) increase in stack consumption! */ (large) increase in stack consumption! */
@ -350,6 +347,9 @@ void EvalState::eval(Env & env, Expr e, Value & v)
nrEvaluated++; nrEvaluated++;
e->eval(*this, env, v);
#if 0
Sym name; Sym name;
int n; int n;
ATerm s; ATermList context, es; ATerm s; ATermList context, es;
@ -357,138 +357,6 @@ void EvalState::eval(Env & env, Expr e, Value & v)
Expr e1, e2, e3, fun, arg, attrs; Expr e1, e2, e3, fun, arg, attrs;
Pattern pat; Expr body; Pos pos; Pattern pat; Expr body; Pos pos;
if (matchVar(e, name)) {
Value * v2 = lookupVar(&env, name);
forceValue(*v2);
v = *v2;
}
else if (matchInt(e, n))
mkInt(v, n);
else if (matchStr(e, s, context)) {
assert(context == ATempty);
mkString(v, ATgetName(ATgetAFun(s)));
}
else if (matchPath(e, s))
mkPath(v, ATgetName(ATgetAFun(s)));
else if (matchAttrs(e, es)) {
mkAttrs(v);
ATerm e2, pos;
for (ATermIterator i(es); i; ++i) {
if (!matchBind(*i, name, e2, pos)) abort(); /* can't happen */
Value & v2 = (*v.attrs)[name];
nrValues++;
mkThunk(v2, env, e2);
}
}
else if (matchRec(e, rbnds, nrbnds)) {
/* Create a new environment that contains the attributes in
this `rec'. */
Env & env2(allocEnv());
env2.up = &env;
v.type = tAttrs;
v.attrs = &env2.bindings;
/* The recursive attributes are evaluated in the new
environment. */
ATerm name, e2, pos;
for (ATermIterator i(rbnds); i; ++i) {
if (!matchBind(*i, name, e2, pos)) abort(); /* can't happen */
Value & v2 = env2.bindings[name];
nrValues++;
mkThunk(v2, env2, e2);
}
/* The non-recursive attributes, on the other hand, are
evaluated in the original environment. */
for (ATermIterator i(nrbnds); i; ++i) {
if (!matchBind(*i, name, e2, pos)) abort(); /* can't happen */
Value & v2 = env2.bindings[name];
nrValues++;
mkThunk(v2, env, e2);
}
}
else if (matchSelect(e, e2, name)) {
Value v2;
eval(env, e2, v2);
forceAttrs(v2); // !!! eval followed by force is slightly inefficient
Bindings::iterator i = v2.attrs->find(name);
if (i == v2.attrs->end())
throwEvalError("attribute `%1%' missing", aterm2String(name));
try {
forceValue(i->second);
} catch (Error & e) {
addErrorPrefix(e, "while evaluating the attribute `%1%':\n", aterm2String(name));
throw;
}
v = i->second;
}
else if (matchFunction(e, pat, body, pos)) {
v.type = tLambda;
v.lambda.env = &env;
v.lambda.pat = pat;
v.lambda.body = body;
}
else if (matchCall(e, fun, arg)) {
Value vFun;
eval(env, fun, vFun);
Value vArg;
mkThunk(vArg, env, arg); // !!! should this be on the heap?
callFunction(vFun, vArg, v);
}
else if (matchWith(e, attrs, body, pos)) {
Env & env2(allocEnv());
env2.up = &env;
Value & vAttrs = env2.bindings[sWith];
nrValues++;
eval(env, attrs, vAttrs);
forceAttrs(vAttrs);
eval(env2, body, v);
}
else if (matchList(e, es)) {
mkList(v, ATgetLength(es));
for (unsigned int n = 0; n < v.list.length; ++n, es = ATgetNext(es))
mkThunk(v.list.elems[n], env, ATgetFirst(es));
}
else if (matchOpEq(e, e1, e2)) {
Value v1; eval(env, e1, v1);
Value v2; eval(env, e2, v2);
mkBool(v, eqValues(v1, v2));
}
else if (matchOpNEq(e, e1, e2)) {
Value v1; eval(env, e1, v1);
Value v2; eval(env, e2, v2);
mkBool(v, !eqValues(v1, v2));
}
else if (matchOpConcat(e, e1, e2)) {
Value v1; eval(env, e1, v1);
forceList(v1);
Value v2; eval(env, e2, v2);
forceList(v2);
mkList(v, v1.list.length + v2.list.length);
/* !!! This loses sharing with the original lists. We could
use a tCopy node, but that would use more memory. */
for (unsigned int n = 0; n < v1.list.length; ++n)
v.list.elems[n] = v1.list.elems[n];
for (unsigned int n = 0; n < v2.list.length; ++n)
v.list.elems[n + v1.list.length] = v2.list.elems[n];
}
else if (matchConcatStrings(e, es)) { else if (matchConcatStrings(e, es)) {
PathSet context; PathSet context;
std::ostringstream s; std::ostringstream s;
@ -521,10 +389,6 @@ void EvalState::eval(Env & env, Expr e, Value & v)
mkString(v, s.str(), context); mkString(v, s.str(), context);
} }
/* Conditionals. */
else if (matchIf(e, e1, e2, e3))
eval(env, evalBool(env, e1) ? e2 : e3, v);
/* Assertions. */ /* Assertions. */
else if (matchAssert(e, e1, e2, pos)) { else if (matchAssert(e, e1, e2, pos)) {
if (!evalBool(env, e1)) if (!evalBool(env, e1))
@ -536,30 +400,6 @@ void EvalState::eval(Env & env, Expr e, Value & v)
else if (matchOpNot(e, e1)) else if (matchOpNot(e, e1))
mkBool(v, !evalBool(env, e1)); mkBool(v, !evalBool(env, e1));
/* Implication. */
else if (matchOpImpl(e, e1, e2))
return mkBool(v, !evalBool(env, e1) || evalBool(env, e2));
/* Conjunction (logical AND). */
else if (matchOpAnd(e, e1, e2))
mkBool(v, evalBool(env, e1) && evalBool(env, e2));
/* Disjunction (logical OR). */
else if (matchOpOr(e, e1, e2))
mkBool(v, evalBool(env, e1) || evalBool(env, e2));
/* Attribute set update (//). */
else if (matchOpUpdate(e, e1, e2)) {
Value v2;
eval(env, e1, v2);
cloneAttrs(v2, v);
eval(env, e2, v2);
foreach (Bindings::iterator, i, *v2.attrs)
(*v.attrs)[i->first] = i->second; // !!! sharing
}
/* Attribute existence test (?). */ /* Attribute existence test (?). */
else if (matchOpHasAttr(e, e1, name)) { else if (matchOpHasAttr(e, e1, name)) {
Value vAttrs; Value vAttrs;
@ -567,8 +407,130 @@ void EvalState::eval(Env & env, Expr e, Value & v)
forceAttrs(vAttrs); forceAttrs(vAttrs);
mkBool(v, vAttrs.attrs->find(name) != vAttrs.attrs->end()); mkBool(v, vAttrs.attrs->find(name) != vAttrs.attrs->end());
} }
#endif
}
else abort();
void EvalState::eval(Expr * e, Value & v)
{
eval(baseEnv, e, v);
}
bool EvalState::evalBool(Env & env, Expr * e)
{
Value v;
eval(env, e, v);
if (v.type != tBool)
throwTypeError("value is %1% while a Boolean was expected", showType(v));
return v.boolean;
}
void ExprInt::eval(EvalState & state, Env & env, Value & v)
{
mkInt(v, n);
}
void ExprString::eval(EvalState & state, Env & env, Value & v)
{
mkString(v, s.c_str());
}
void ExprPath::eval(EvalState & state, Env & env, Value & v)
{
mkPath(v, s.c_str());
}
void ExprAttrs::eval(EvalState & state, Env & env, Value & v)
{
if (recursive) {
/* Create a new environment that contains the attributes in
this `rec'. */
Env & env2(state.allocEnv());
env2.up = &env;
v.type = tAttrs;
v.attrs = &env2.bindings;
/* The recursive attributes are evaluated in the new
environment. */
foreach (Attrs::iterator, i, attrs) {
Value & v2 = env2.bindings[i->first];
mkThunk(v2, env2, i->second);
}
/* The inherited attributes, on the other hand, are
evaluated in the original environment. */
foreach (list<string>::iterator, i, inherited) {
Value & v2 = env2.bindings[*i];
mkCopy(v2, *lookupVar(&env, *i));
}
}
else {
state.mkAttrs(v);
foreach (Attrs::iterator, i, attrs) {
Value & v2 = (*v.attrs)[i->first];
mkThunk(v2, env, i->second);
}
}
}
void ExprList::eval(EvalState & state, Env & env, Value & v)
{
state.mkList(v, elems.size());
for (unsigned int n = 0; n < v.list.length; ++n)
mkThunk(v.list.elems[n], env, elems[n]);
}
void ExprVar::eval(EvalState & state, Env & env, Value & v)
{
Value * v2 = lookupVar(&env, name);
state.forceValue(*v2);
v = *v2;
}
void ExprSelect::eval(EvalState & state, Env & env, Value & v)
{
Value v2;
state.eval(env, e, v2);
state.forceAttrs(v2); // !!! eval followed by force is slightly inefficient
Bindings::iterator i = v2.attrs->find(name);
if (i == v2.attrs->end())
throwEvalError("attribute `%1%' missing", name);
try {
state.forceValue(i->second);
} catch (Error & e) {
addErrorPrefix(e, "while evaluating the attribute `%1%':\n", name);
throw;
}
v = i->second;
}
void ExprLambda::eval(EvalState & state, Env & env, Value & v)
{
v.type = tLambda;
v.lambda.env = &env;
v.lambda.fun = this;
}
void ExprApp::eval(EvalState & state, Env & env, Value & v)
{
Value vFun;
state.eval(env, e1, vFun);
Value vArg;
mkThunk(vArg, env, e2); // !!! should this be on the heap?
state.callFunction(vFun, vArg, v);
} }
@ -613,19 +575,17 @@ void EvalState::callFunction(Value & fun, Value & arg, Value & v)
Env & env2(allocEnv()); Env & env2(allocEnv());
env2.up = fun.lambda.env; env2.up = fun.lambda.env;
ATermList formals; ATerm ellipsis, name; if (!fun.lambda.fun->matchAttrs) {
Value & vArg = env2.bindings[fun.lambda.fun->arg];
if (matchVarPat(fun.lambda.pat, name)) {
Value & vArg = env2.bindings[name];
nrValues++; nrValues++;
vArg = arg; vArg = arg;
} }
else if (matchAttrsPat(fun.lambda.pat, formals, ellipsis, name)) { else {
forceAttrs(arg); forceAttrs(arg);
if (name != sNoAlias) { if (!fun.lambda.fun->arg.empty()) {
env2.bindings[name] = arg; env2.bindings[fun.lambda.fun->arg] = arg;
nrValues++; nrValues++;
} }
@ -633,21 +593,15 @@ void EvalState::callFunction(Value & fun, Value & arg, Value & v)
there is no matching actual argument but the formal there is no matching actual argument but the formal
argument has a default, use the default. */ argument has a default, use the default. */
unsigned int attrsUsed = 0; unsigned int attrsUsed = 0;
for (ATermIterator i(formals); i; ++i) { foreach (Formals::Formals_::iterator, i, fun.lambda.fun->formals->formals) {
Expr def; Sym name; Bindings::iterator j = arg.attrs->find(i->name);
DefaultValue def2;
if (!matchFormal(*i, name, def2)) abort(); /* can't happen */
Bindings::iterator j = arg.attrs->find(name);
Value & v = env2.bindings[name]; Value & v = env2.bindings[i->name];
nrValues++; nrValues++;
if (j == arg.attrs->end()) { if (j == arg.attrs->end()) {
if (!matchDefaultValue(def2, def)) def = 0; if (!i->def) throwTypeError("the argument named `%1%' required by the function is missing", i->name);
if (def == 0) throwTypeError("the argument named `%1%' required by the function is missing", mkThunk(v, env2, i->def);
aterm2String(name));
mkThunk(v, env2, def);
} else { } else {
attrsUsed++; attrsUsed++;
mkCopy(v, j->second); mkCopy(v, j->second);
@ -658,13 +612,11 @@ void EvalState::callFunction(Value & fun, Value & arg, Value & v)
argument (unless the attribute match specifies a `...'). argument (unless the attribute match specifies a `...').
TODO: show the names of the expected/unexpected TODO: show the names of the expected/unexpected
arguments. */ arguments. */
if (ellipsis == eFalse && attrsUsed != arg.attrs->size()) if (!fun.lambda.fun->formals->ellipsis && attrsUsed != arg.attrs->size())
throwTypeError("function called with unexpected argument"); throwTypeError("function called with unexpected argument");
} }
else abort(); eval(env2, fun.lambda.fun->body, v);
eval(env2, fun.lambda.body, v);
} }
@ -672,45 +624,114 @@ void EvalState::autoCallFunction(const Bindings & args, Value & fun, Value & res
{ {
forceValue(fun); forceValue(fun);
ATerm name; if (fun.type != tLambda || !fun.lambda.fun->matchAttrs) {
ATermList formals;
ATermBool ellipsis;
if (fun.type != tLambda || !matchAttrsPat(fun.lambda.pat, formals, ellipsis, name)) {
res = fun; res = fun;
return; return;
} }
Value actualArgs; Value actualArgs;
mkAttrs(actualArgs); mkAttrs(actualArgs);
for (ATermIterator i(formals); i; ++i) { foreach (Formals::Formals_::iterator, i, fun.lambda.fun->formals->formals) {
Expr name, def; ATerm def2; Bindings::const_iterator j = args.find(i->name);
if (!matchFormal(*i, name, def2)) abort();
Bindings::const_iterator j = args.find(name);
if (j != args.end()) if (j != args.end())
(*actualArgs.attrs)[name] = j->second; (*actualArgs.attrs)[i->name] = j->second;
else if (!matchDefaultValue(def2, def)) else if (!i->def)
throwTypeError("cannot auto-call a function that has an argument without a default value (`%1%')", aterm2String(name)); throwTypeError("cannot auto-call a function that has an argument without a default value (`%1%')", i->name);
} }
callFunction(fun, actualArgs, res); callFunction(fun, actualArgs, res);
} }
void EvalState::eval(Expr e, Value & v) void ExprWith::eval(EvalState & state, Env & env, Value & v)
{ {
eval(baseEnv, e, v); Env & env2(state.allocEnv());
env2.up = &env;
Value & vAttrs = env2.bindings["<with>"];
state.eval(env, attrs, vAttrs);
state.forceAttrs(vAttrs);
state.eval(env2, body, v);
} }
bool EvalState::evalBool(Env & env, Expr e) void ExprIf::eval(EvalState & state, Env & env, Value & v)
{ {
Value v; state.eval(env, state.evalBool(env, cond) ? then : else_, v);
eval(env, e, v); }
if (v.type != tBool)
throwTypeError("value is %1% while a Boolean was expected", showType(v));
return v.boolean; void ExprOpEq::eval(EvalState & state, Env & env, Value & v)
{
Value v1; state.eval(env, e1, v1);
Value v2; state.eval(env, e2, v2);
mkBool(v, state.eqValues(v1, v2));
}
void ExprOpNEq::eval(EvalState & state, Env & env, Value & v)
{
Value v1; state.eval(env, e1, v1);
Value v2; state.eval(env, e2, v2);
mkBool(v, !state.eqValues(v1, v2));
}
void ExprOpAnd::eval(EvalState & state, Env & env, Value & v)
{
mkBool(v, state.evalBool(env, e1) && state.evalBool(env, e2));
}
void ExprOpOr::eval(EvalState & state, Env & env, Value & v)
{
mkBool(v, state.evalBool(env, e1) || state.evalBool(env, e2));
}
void ExprOpImpl::eval(EvalState & state, Env & env, Value & v)
{
mkBool(v, !state.evalBool(env, e1) || state.evalBool(env, e2));
}
void ExprOpUpdate::eval(EvalState & state, Env & env, Value & v)
{
Value v2;
state.eval(env, e1, v2);
state.forceAttrs(v2);
state.cloneAttrs(v2, v);
state.eval(env, e2, v2);
state.forceAttrs(v2);
foreach (Bindings::iterator, i, *v2.attrs)
(*v.attrs)[i->first] = i->second; // !!! sharing
}
void ExprOpConcatStrings::eval(EvalState & state, Env & env, Value & v)
{
abort();
}
void ExprOpConcatLists::eval(EvalState & state, Env & env, Value & v)
{
Value v1; state.eval(env, e1, v1);
state.forceList(v1);
Value v2; state.eval(env, e2, v2);
state.forceList(v2);
state.mkList(v, v1.list.length + v2.list.length);
/* !!! This loses sharing with the original lists. We could use a
tCopy node, but that would use more memory. */
for (unsigned int n = 0; n < v1.list.length; ++n)
v.list.elems[n] = v1.list.elems[n];
for (unsigned int n = 0; n < v2.list.length; ++n)
v.list.elems[n + v1.list.length] = v2.list.elems[n];
} }
@ -827,7 +848,7 @@ string EvalState::forceStringNoCtx(Value & v)
bool EvalState::isDerivation(Value & v) bool EvalState::isDerivation(Value & v)
{ {
if (v.type != tAttrs) return false; if (v.type != tAttrs) return false;
Bindings::iterator i = v.attrs->find(toATerm("type")); Bindings::iterator i = v.attrs->find("type");
return i != v.attrs->end() && forceStringNoCtx(i->second) == "derivation"; return i != v.attrs->end() && forceStringNoCtx(i->second) == "derivation";
} }
@ -871,7 +892,7 @@ string EvalState::coerceToString(Value & v, PathSet & context,
} }
if (v.type == tAttrs) { if (v.type == tAttrs) {
Bindings::iterator i = v.attrs->find(toATerm("outPath")); Bindings::iterator i = v.attrs->find("outPath");
if (i == v.attrs->end()) if (i == v.attrs->end())
throwTypeError("cannot coerce an attribute set (except a derivation) to a string"); throwTypeError("cannot coerce an attribute set (except a derivation) to a string");
return coerceToString(i->second, context, coerceMore, copyToStore); return coerceToString(i->second, context, coerceMore, copyToStore);

46
src/libexpr/eval.hh
View file

@ -3,7 +3,6 @@
#include <map> #include <map>
#include "aterm.hh"
#include "nixexpr.hh" #include "nixexpr.hh"
@ -15,7 +14,7 @@ class EvalState;
struct Env; struct Env;
struct Value; struct Value;
typedef ATerm Sym; typedef string Sym;
typedef std::map<Sym, Value> Bindings; typedef std::map<Sym, Value> Bindings;
@ -55,10 +54,32 @@ struct Value
{ {
int integer; int integer;
bool boolean; bool boolean;
/* Strings in the evaluator carry a so-called `context' (the
ATermList) which is a list of strings representing store
paths. This is to allow users to write things like
"--with-freetype2-library=" + freetype + "/lib"
where `freetype' is a derivation (or a source to be copied
to the store). If we just concatenated the strings without
keeping track of the referenced store paths, then if the
string is used as a derivation attribute, the derivation
will not have the correct dependencies in its inputDrvs and
inputSrcs.
The semantics of the context is as follows: when a string
with context C is used as a derivation attribute, then the
derivations in C will be added to the inputDrvs of the
derivation, and the other store paths in C will be added to
the inputSrcs of the derivations.
For canonicity, the store paths should be in sorted order. */
struct { struct {
const char * s; const char * s;
const char * * context; const char * * context;
} string; } string;
const char * path; const char * path;
Bindings * attrs; Bindings * attrs;
struct { struct {
@ -67,15 +88,14 @@ struct Value
} list; } list;
struct { struct {
Env * env; Env * env;
Expr expr; Expr * expr;
} thunk; } thunk;
struct { struct {
Value * left, * right; Value * left, * right;
} app; } app;
struct { struct {
Env * env; Env * env;
Pattern pat; ExprLambda * fun;
Expr body;
} lambda; } lambda;
Value * val; Value * val;
struct { struct {
@ -104,7 +124,7 @@ static inline void mkBool(Value & v, bool b)
} }
static inline void mkThunk(Value & v, Env & env, Expr expr) static inline void mkThunk(Value & v, Env & env, Expr * expr)
{ {
v.type = tThunk; v.type = tThunk;
v.thunk.env = &env; v.thunk.env = &env;
@ -146,7 +166,7 @@ private:
bool allowUnsafeEquality; bool allowUnsafeEquality;
ATermMap parseTrees; std::map<Path, Expr *> parseTrees;
public: public:
@ -159,12 +179,12 @@ public:
/* Evaluate an expression to normal form, storing the result in /* Evaluate an expression to normal form, storing the result in
value `v'. */ value `v'. */
void eval(Expr e, Value & v); void eval(Expr * e, Value & v);
void eval(Env & env, Expr e, Value & v); void eval(Env & env, Expr * e, Value & v);
/* Evaluation the expression, then verify that it has the expected /* Evaluation the expression, then verify that it has the expected
type. */ type. */
bool evalBool(Env & env, Expr e); bool evalBool(Env & env, Expr * e);
/* If `v' is a thunk, enter it and overwrite `v' with the result /* If `v' is a thunk, enter it and overwrite `v' with the result
of the evaluation of the thunk. If `v' is a delayed function of the evaluation of the thunk. If `v' is a delayed function
@ -215,12 +235,12 @@ private:
void addPrimOp(const string & name, void addPrimOp(const string & name,
unsigned int arity, PrimOp primOp); unsigned int arity, PrimOp primOp);
public:
/* Do a deep equality test between two values. That is, list /* Do a deep equality test between two values. That is, list
elements and attributes are compared recursively. */ elements and attributes are compared recursively. */
bool eqValues(Value & v1, Value & v2); bool eqValues(Value & v1, Value & v2);
public:
void callFunction(Value & fun, Value & arg, Value & v); void callFunction(Value & fun, Value & arg, Value & v);
/* Automatically call a function for which each argument has a /* Automatically call a function for which each argument has a
@ -233,7 +253,7 @@ public:
void mkList(Value & v, unsigned int length); void mkList(Value & v, unsigned int length);
void mkAttrs(Value & v); void mkAttrs(Value & v);
void mkThunk_(Value & v, Expr expr); void mkThunk_(Value & v, Expr * expr);
void cloneAttrs(Value & src, Value & dst); void cloneAttrs(Value & src, Value & dst);

21
src/libexpr/get-drvs.cc
View file

@ -1,5 +1,4 @@
#include "get-drvs.hh" #include "get-drvs.hh"
#include "nixexpr-ast.hh"
#include "util.hh" #include "util.hh"
@ -9,7 +8,7 @@ namespace nix {
string DrvInfo::queryDrvPath(EvalState & state) const string DrvInfo::queryDrvPath(EvalState & state) const
{ {
if (drvPath == "") { if (drvPath == "") {
Bindings::iterator i = attrs->find(toATerm("drvPath")); Bindings::iterator i = attrs->find("drvPath");
PathSet context; PathSet context;
(string &) drvPath = i != attrs->end() ? state.coerceToPath(i->second, context) : ""; (string &) drvPath = i != attrs->end() ? state.coerceToPath(i->second, context) : "";
} }
@ -20,7 +19,7 @@ string DrvInfo::queryDrvPath(EvalState & state) const
string DrvInfo::queryOutPath(EvalState & state) const string DrvInfo::queryOutPath(EvalState & state) const
{ {
if (outPath == "") { if (outPath == "") {
Bindings::iterator i = attrs->find(toATerm("outPath")); Bindings::iterator i = attrs->find("outPath");
PathSet context; PathSet context;
(string &) outPath = i != attrs->end() ? state.coerceToPath(i->second, context) : ""; (string &) outPath = i != attrs->end() ? state.coerceToPath(i->second, context) : "";
} }
@ -32,7 +31,7 @@ MetaInfo DrvInfo::queryMetaInfo(EvalState & state) const
{ {
MetaInfo meta; MetaInfo meta;
Bindings::iterator a = attrs->find(toATerm("meta")); Bindings::iterator a = attrs->find("meta");
if (a == attrs->end()) return meta; /* fine, empty meta information */ if (a == attrs->end()) return meta; /* fine, empty meta information */
state.forceAttrs(a->second); state.forceAttrs(a->second);
@ -51,7 +50,7 @@ MetaInfo DrvInfo::queryMetaInfo(EvalState & state) const
for (unsigned int j = 0; j < i->second.list.length; ++j) for (unsigned int j = 0; j < i->second.list.length; ++j)
value.stringValues.push_back(state.forceStringNoCtx(i->second.list.elems[j])); value.stringValues.push_back(state.forceStringNoCtx(i->second.list.elems[j]));
} else continue; } else continue;
meta[aterm2String(i->first)] = value; meta[i->first] = value;
} }
return meta; return meta;
@ -114,12 +113,12 @@ static bool getDerivation(EvalState & state, Value & v,
DrvInfo drv; DrvInfo drv;
Bindings::iterator i = v.attrs->find(toATerm("name")); Bindings::iterator i = v.attrs->find("name");
/* !!! We really would like to have a decent back trace here. */ /* !!! We really would like to have a decent back trace here. */
if (i == v.attrs->end()) throw TypeError("derivation name missing"); if (i == v.attrs->end()) throw TypeError("derivation name missing");
drv.name = state.forceStringNoCtx(i->second); drv.name = state.forceStringNoCtx(i->second);
i = v.attrs->find(toATerm("system")); i = v.attrs->find("system");
if (i == v.attrs->end()) if (i == v.attrs->end())
drv.system = "unknown"; drv.system = "unknown";
else else
@ -171,7 +170,7 @@ static void getDerivations(EvalState & state, Value & vIn,
/* !!! undocumented hackery to support combining channels in /* !!! undocumented hackery to support combining channels in
nix-env.cc. */ nix-env.cc. */
bool combineChannels = v.attrs->find(toATerm("_combineChannels")) != v.attrs->end(); bool combineChannels = v.attrs->find("_combineChannels") != v.attrs->end();
/* Consider the attributes in sorted order to get more /* Consider the attributes in sorted order to get more
deterministic behaviour in nix-env operations (e.g. when deterministic behaviour in nix-env operations (e.g. when
@ -180,12 +179,12 @@ static void getDerivations(EvalState & state, Value & vIn,
precedence). */ precedence). */
StringSet attrs; StringSet attrs;
foreach (Bindings::iterator, i, *v.attrs) foreach (Bindings::iterator, i, *v.attrs)
attrs.insert(aterm2String(i->first)); attrs.insert(i->first);
foreach (StringSet::iterator, i, attrs) { foreach (StringSet::iterator, i, attrs) {
startNest(nest, lvlDebug, format("evaluating attribute `%1%'") % *i); startNest(nest, lvlDebug, format("evaluating attribute `%1%'") % *i);
string pathPrefix2 = addToPath(pathPrefix, *i); string pathPrefix2 = addToPath(pathPrefix, *i);
Value & v2((*v.attrs)[toATerm(*i)]); Value & v2((*v.attrs)[*i]);
if (combineChannels) if (combineChannels)
getDerivations(state, v2, pathPrefix2, autoArgs, drvs, done); getDerivations(state, v2, pathPrefix2, autoArgs, drvs, done);
else if (getDerivation(state, v2, pathPrefix2, drvs, done)) { else if (getDerivation(state, v2, pathPrefix2, drvs, done)) {
@ -194,7 +193,7 @@ static void getDerivations(EvalState & state, Value & vIn,
if it has a `recurseForDerivations = true' if it has a `recurseForDerivations = true'
attribute. */ attribute. */
if (v2.type == tAttrs) { if (v2.type == tAttrs) {
Bindings::iterator j = v2.attrs->find(toATerm("recurseForDerivations")); Bindings::iterator j = v2.attrs->find("recurseForDerivations");
if (j != v2.attrs->end() && state.forceBool(j->second)) if (j != v2.attrs->end() && state.forceBool(j->second))
getDerivations(state, v2, pathPrefix2, autoArgs, drvs, done); getDerivations(state, v2, pathPrefix2, autoArgs, drvs, done);
} }

24
src/libexpr/lexer.l
View file

@ -8,9 +8,7 @@
%{ %{
#include "aterm.hh"
#include "nixexpr.hh" #include "nixexpr.hh"
#include "nixexpr-ast.hh"
#define BISON_HEADER_HACK #define BISON_HEADER_HACK
#include "parser-tab.hh" #include "parser-tab.hh"
@ -45,8 +43,9 @@ static void adjustLoc(YYLTYPE * loc, const char * s, size_t len)
} }
static Expr unescapeStr(const char * s) static Expr * unescapeStr(const char * s)
{ {
#if 0
string t; string t;
char c; char c;
while ((c = *s++)) { while ((c = *s++)) {
@ -66,6 +65,7 @@ static Expr unescapeStr(const char * s)
else t += c; else t += c;
} }
return makeStr(toATerm(t), ATempty); return makeStr(toATerm(t), ATempty);
#endif
} }
@ -105,7 +105,7 @@ inherit { return INHERIT; }
\/\/ { return UPDATE; } \/\/ { return UPDATE; }
\+\+ { return CONCAT; } \+\+ { return CONCAT; }
{ID} { yylval->t = toATerm(yytext); return ID; /* !!! alloc */ } {ID} { yylval->id = strdup(yytext); return ID; }
{INT} { int n = atoi(yytext); /* !!! overflow */ {INT} { int n = atoi(yytext); /* !!! overflow */
yylval->n = n; yylval->n = n;
return INT; return INT;
@ -117,7 +117,7 @@ inherit { return INHERIT; }
shouldn't be followed by a "{". Right now "$\"" will be consumed shouldn't be followed by a "{". Right now "$\"" will be consumed
as part of a string, rather than a "$" followed by the string as part of a string, rather than a "$" followed by the string
terminator. Disallow "$\"" for now. */ terminator. Disallow "$\"" for now. */
yylval->t = unescapeStr(yytext); /* !!! alloc */ yylval->e = unescapeStr(yytext);
return STR; return STR;
} }
<STRING>\$\{ { BEGIN(INITIAL); return DOLLAR_CURLY; } <STRING>\$\{ { BEGIN(INITIAL); return DOLLAR_CURLY; }
@ -126,31 +126,31 @@ inherit { return INHERIT; }
\'\'(\ *\n)? { BEGIN(IND_STRING); return IND_STRING_OPEN; } \'\'(\ *\n)? { BEGIN(IND_STRING); return IND_STRING_OPEN; }
<IND_STRING>([^\$\']|\$[^\{\']|\'[^\'\$])+ { <IND_STRING>([^\$\']|\$[^\{\']|\'[^\'\$])+ {
yylval->t = makeIndStr(toATerm(yytext)); //yylval->t = makeIndStr(toATerm(yytext));
return IND_STR; return IND_STR;
} }
<IND_STRING>\'\'\$ { <IND_STRING>\'\'\$ {
yylval->t = makeIndStr(toATerm("$")); //yylval->t = makeIndStr(toATerm("$"));
return IND_STR; return IND_STR;
} }
<IND_STRING>\'\'\' { <IND_STRING>\'\'\' {
yylval->t = makeIndStr(toATerm("''")); //yylval->t = makeIndStr(toATerm("''"));
return IND_STR; return IND_STR;
} }
<IND_STRING>\'\'\\. { <IND_STRING>\'\'\\. {
yylval->t = unescapeStr(yytext + 2); //yylval->t = unescapeStr(yytext + 2);
return IND_STR; return IND_STR;
} }
<IND_STRING>\$\{ { BEGIN(INITIAL); return DOLLAR_CURLY; } <IND_STRING>\$\{ { BEGIN(INITIAL); return DOLLAR_CURLY; }
<IND_STRING>\'\' { BEGIN(INITIAL); return IND_STRING_CLOSE; } <IND_STRING>\'\' { BEGIN(INITIAL); return IND_STRING_CLOSE; }
<IND_STRING>\' { <IND_STRING>\' {
yylval->t = makeIndStr(toATerm("'")); //yylval->t = makeIndStr(toATerm("'"));
return IND_STR; return IND_STR;
} }
<IND_STRING>. return yytext[0]; /* just in case: shouldn't be reached */ <IND_STRING>. return yytext[0]; /* just in case: shouldn't be reached */
{PATH} { yylval->t = toATerm(yytext); return PATH; /* !!! alloc */ } {PATH} { yylval->path = strdup(yytext); return PATH; }
{URI} { yylval->t = toATerm(yytext); return URI; /* !!! alloc */ } {URI} { yylval->uri = strdup(yytext); return URI; }
[ \t\r\n]+ /* eat up whitespace */ [ \t\r\n]+ /* eat up whitespace */
\#[^\r\n]* /* single-line comments */ \#[^\r\n]* /* single-line comments */

97
src/libexpr/nixexpr-ast.def
View file

@ -1,97 +0,0 @@
init initNixExprHelpers
Pos | string int int | Pos |
NoPos | | Pos |
Function | Pattern Expr Pos | Expr |
Assert | Expr Expr Pos | Expr |
With | Expr Expr Pos | Expr |
If | Expr Expr Expr | Expr |
OpNot | Expr | Expr |
OpEq | Expr Expr | Expr |
OpNEq | Expr Expr | Expr |
OpAnd | Expr Expr | Expr |
OpOr | Expr Expr | Expr |
OpImpl | Expr Expr | Expr |
OpUpdate | Expr Expr | Expr |
OpHasAttr | Expr string | Expr |
OpPlus | Expr Expr | Expr |
OpConcat | Expr Expr | Expr |
ConcatStrings | ATermList | Expr |
Call | Expr Expr | Expr |
Select | Expr string | Expr |
Var | string | Expr |
Int | int | Expr |
# Strings in the evaluator carry a so-called `context' (the ATermList)
# which is a list of strings representing store paths. This is to
# allow users to write things like
#
# "--with-freetype2-library=" + freetype + "/lib"
#
# where `freetype' is a derivation (or a source to be copied to the
# store). If we just concatenated the strings without keeping track
# of the referenced store paths, then if the string is used as a
# derivation attribute, the derivation will not have the correct
# dependencies in its inputDrvs and inputSrcs.
#
# The semantics of the context is as follows: when a string with
# context C is used as a derivation attribute, then the derivations in
# C will be added to the inputDrvs of the derivation, and the other
# store paths in C will be added to the inputSrcs of the derivations.
#
# For canonicity, the store paths should be in sorted order.
Str | string ATermList | Expr |
Str | string | Expr | ObsoleteStr
# Internal to the parser, doesn't occur in ASTs.
IndStr | string | Expr |
# A path is a reference to a file system object that is to be copied
# to the Nix store when used as a derivation attribute. When it is
# concatenated to a string (i.e., `str + path'), it is also copied and
# the resulting store path is concatenated to the string (with the
# store path in the context). If a string or path is concatenated to
# a path (i.e., `path + str' or `path + path'), the result is a new
# path (if the right-hand side is a string, the context must be
# empty).
Path | string | Expr |
List | ATermList | Expr |
BlackHole | | Expr |
Undefined | | Expr |
Removed | | Expr |
PrimOp | int ATermBlob ATermList | Expr |
Attrs | ATermList | Expr |
Closed | Expr | Expr |
Rec | ATermList ATermList | Expr |
Bool | ATermBool | Expr |
Null | | Expr |
Bind | string Expr Pos | ATerm |
BindAttrPath | ATermList Expr Pos | ATerm | # desugared during parsing
Bind | string Expr | ATerm | ObsoleteBind
Inherit | Expr ATermList Pos | ATerm |
Scope | | Expr |
VarPat | string | Pattern |
AttrsPat | ATermList ATermBool string | Pattern | # bool = `...'
Formal | string DefaultValue | ATerm |
DefaultValue | Expr | DefaultValue |
NoDefaultValue | | DefaultValue |
True | | ATermBool |
False | | ATermBool |
PrimOpDef | int ATermBlob | ATerm |
AttrRHS | Expr Pos | ATerm |
eTrue = makeBool(makeTrue())
eFalse = makeBool(makeFalse())
sOverrides = toATerm("__overrides")
sNoAlias = toATerm("")
sWith = toATerm("<with>")

110
src/libexpr/nixexpr.cc
View file

@ -1,17 +1,94 @@
#include "nixexpr.hh" #include "nixexpr.hh"
#include "derivations.hh" #include "derivations.hh"
#include "util.hh" #include "util.hh"
#include "aterm.hh"
#include "nixexpr-ast.hh"
#include "nixexpr-ast.cc"
#include <cstdlib> #include <cstdlib>
namespace nix { namespace nix {
std::ostream & operator << (std::ostream & str, Expr & e)
{
e.show(str);
return str;
}
void ExprInt::show(std::ostream & str)
{
str << n;
}
void ExprString::show(std::ostream & str)
{
str << "\"" << s << "\""; // !!! escaping
}
void ExprPath::show(std::ostream & str)
{
str << s;
}
void ExprVar::show(std::ostream & str)
{
str << name;
}
void ExprSelect::show(std::ostream & str)
{
str << "(" << *e << ")." << name;
}
void ExprAttrs::show(std::ostream & str)
{
if (recursive) str << "rec ";
str << "{ ";
foreach (list<string>::iterator, i, inherited)
str << "inherited " << *i << "; ";
foreach (Attrs::iterator, i, attrs)
str << i->first << " = " << *i->second << "; ";
str << "}";
}
void ExprList::show(std::ostream & str)
{
str << "[ ";
foreach (vector<Expr *>::iterator, i, elems)
str << "(" << **i << ") ";
str << "]";
}
void ExprLambda::show(std::ostream & str)
{
str << "(";
if (matchAttrs) {
str << "{ ";
bool first = true;
foreach (Formals::Formals_::iterator, i, formals->formals) {
if (first) first = false; else str << ", ";
str << i->name;
if (i->def) str << " ? " << *i->def;
}
str << " }";
if (arg != "") str << " @ ";
}
if (arg != "") str << arg;
str << ": " << *body << ")";
}
void ExprWith::show(std::ostream & str)
{
str << "with " << *attrs << "; " << *body;
}
void ExprIf::show(std::ostream & str)
{
str << "if " << *cond << " then " << *then << " else " << *else_;
}
#if 0
string showPos(ATerm pos) string showPos(ATerm pos)
{ {
ATerm path; ATerm path;
@ -159,28 +236,7 @@ void checkVarDefs(const ATermMap & defs, Expr e)
set<Expr> done; set<Expr> done;
checkVarDefs2(done, defs, e); checkVarDefs2(done, defs, e);
} }
#endif
bool matchStr(Expr e, string & s, PathSet & context)
{
ATermList l;
ATerm s_;
if (!matchStr(e, s_, l)) return false;
s = aterm2String(s_);
for (ATermIterator i(l); i; ++i)
context.insert(aterm2String(*i));
return true;
}
Expr makeStr(const string & s, const PathSet & context)
{
return makeStr(toATerm(s), toATermList(context));
}
} }

163
src/libexpr/nixexpr.hh
View file

@ -3,7 +3,6 @@
#include <map> #include <map>
#include "aterm-map.hh"
#include "types.hh" #include "types.hh"
@ -18,22 +17,152 @@ MakeError(Abort, EvalError)
MakeError(TypeError, EvalError) MakeError(TypeError, EvalError)
/* Nix expressions are represented as ATerms. The maximal sharing struct Pos
property of the ATerm library allows us to implement caching of {
normals forms efficiently. */ string file;
typedef ATerm Expr; unsigned int line, column;
typedef ATerm DefaultValue; };
typedef ATerm Pos;
typedef ATerm Pattern;
typedef ATerm ATermBool;
/* A STL vector of ATerms. Should be used with great care since it's /* Abstract syntax of Nix expressions. */
stored on the heap, and the elements are therefore not roots to the
ATerm garbage collector. */ struct Env;
typedef vector<ATerm> ATermVector; struct Value;
struct EvalState;
struct Expr
{
virtual void show(std::ostream & str) = 0;
virtual void eval(EvalState & state, Env & env, Value & v)
{
throw Error("not implemented");
}
};
std::ostream & operator << (std::ostream & str, Expr & e);
#define COMMON_METHODS \
void show(std::ostream & str); \
void eval(EvalState & state, Env & env, Value & v);
struct ExprInt : Expr
{
int n;
ExprInt(int n) : n(n) { };
COMMON_METHODS
};
struct ExprString : Expr
{
string s;
ExprString(const string & s) : s(s) { };
COMMON_METHODS
};
struct ExprPath : Expr
{
string s;
ExprPath(const string & s) : s(s) { };
COMMON_METHODS
};
struct ExprVar : Expr
{
string name;
ExprVar(const string & name) : name(name) { };
COMMON_METHODS
};
struct ExprSelect : Expr
{
Expr * e;
string name;
ExprSelect(Expr * e, const string & name) : e(e), name(name) { };
COMMON_METHODS
};
struct ExprAttrs : Expr
{
bool recursive;
typedef std::map<string, Expr *> Attrs;
Attrs attrs;
list<string> inherited;
ExprAttrs() : recursive(false) { };
COMMON_METHODS
};
struct ExprList : Expr
{
std::vector<Expr *> elems;
ExprList() { };
COMMON_METHODS
};
struct Formal
{
string name;
Expr * def;
Formal(const string & name, Expr * def) : name(name), def(def) { };
};
struct Formals
{
typedef std::list<Formal> Formals_;
Formals_ formals;
bool ellipsis;
};
struct ExprLambda : Expr
{
Pos pos;
string arg;
bool matchAttrs;
Formals * formals;
Expr * body;
ExprLambda(const Pos & pos, const string & arg, bool matchAttrs, Formals * formals, Expr * body)
: pos(pos), arg(arg), matchAttrs(matchAttrs), formals(formals), body(body) { };
COMMON_METHODS
};
struct ExprWith : Expr
{
Pos pos;
Expr * attrs, * body;
ExprWith(const Pos & pos, Expr * attrs, Expr * body) : pos(pos), attrs(attrs), body(body) { };
COMMON_METHODS
};
struct ExprIf : Expr
{
Expr * cond, * then, * else_;
ExprIf(Expr * cond, Expr * then, Expr * else_) : cond(cond), then(then), else_(else_) { };
COMMON_METHODS
};
#define MakeBinOp(name, s) \
struct Expr##name : Expr \
{ \
Expr * e1, * e2; \
Expr##name(Expr * e1, Expr * e2) : e1(e1), e2(e2) { }; \
void show(std::ostream & str) \
{ \
str << *e1 << " " s " " << *e2; \
} \
void eval(EvalState & state, Env & env, Value & v); \
};
MakeBinOp(App, "")
MakeBinOp(OpEq, "==")
MakeBinOp(OpNEq, "!=")
MakeBinOp(OpAnd, "&&")
MakeBinOp(OpOr, "||")
MakeBinOp(OpImpl, "->")
MakeBinOp(OpUpdate, "//")
MakeBinOp(OpConcatStrings, "+")
MakeBinOp(OpConcatLists, "++")
#if 0
/* Show a position. */ /* Show a position. */
string showPos(ATerm pos); string showPos(ATerm pos);
@ -56,13 +185,7 @@ Expr makeAttrs(const ATermMap & attrs);
/* Check whether all variables are defined in the given expression. /* Check whether all variables are defined in the given expression.
Throw an exception if this isn't the case. */ Throw an exception if this isn't the case. */
void checkVarDefs(const ATermMap & def, Expr e); void checkVarDefs(const ATermMap & def, Expr e);
#endif
/* Manipulation of Str() nodes. Note: matchStr() does not clear
context! */
bool matchStr(Expr e, string & s, PathSet & context);
Expr makeStr(const string & s, const PathSet & context = PathSet());
} }

5
src/libexpr/parser.hh
View file

@ -9,11 +9,10 @@ namespace nix {
/* Parse a Nix expression from the specified file. If `path' refers /* Parse a Nix expression from the specified file. If `path' refers
to a directory, then "/default.nix" is appended. */ to a directory, then "/default.nix" is appended. */
Expr parseExprFromFile(EvalState & state, Path path); Expr * parseExprFromFile(Path path);
/* Parse a Nix expression from the specified string. */ /* Parse a Nix expression from the specified string. */
Expr parseExprFromString(EvalState & state, const string & s, Expr * parseExprFromString(const string & s, const Path & basePath);
const Path & basePath);
} }

191
src/libexpr/parser.y
View file

@ -23,13 +23,12 @@
#include "aterm.hh" #include "aterm.hh"
#include "util.hh" #include "util.hh"
#include "nixexpr.hh"
#include "parser-tab.hh" #include "parser-tab.hh"
#include "lexer-tab.hh" #include "lexer-tab.hh"
#define YYSTYPE YYSTYPE // workaround a bug in Bison 2.4 #define YYSTYPE YYSTYPE // workaround a bug in Bison 2.4
#include "nixexpr.hh"
#include "nixexpr-ast.hh"
using namespace nix; using namespace nix;
@ -39,13 +38,14 @@ namespace nix {
struct ParseData struct ParseData
{ {
Expr result; Expr * result;
Path basePath; Path basePath;
Path path; Path path;
string error; string error;
}; };
#if 0
static string showAttrPath(ATermList attrPath) static string showAttrPath(ATermList attrPath)
{ {
string s; string s;
@ -79,10 +79,12 @@ static ATermList buildAttrs(const Tree & t, ATermList & nonrec)
: makeBind(i->first, makeAttrs(buildAttrs(i->second, nonrec)), makeNoPos())); : makeBind(i->first, makeAttrs(buildAttrs(i->second, nonrec)), makeNoPos()));
return res; return res;
} }
#endif
static Expr fixAttrs(bool recursive, ATermList as) static void fixAttrs(ExprAttrs & attrs)
{ {
#if 0
Tree attrs; Tree attrs;
/* This ATermMap is needed to ensure that the `leaf' fields in the /* This ATermMap is needed to ensure that the `leaf' fields in the
@ -135,9 +137,11 @@ static Expr fixAttrs(bool recursive, ATermList as)
ATermList rec = buildAttrs(attrs, nonrec); ATermList rec = buildAttrs(attrs, nonrec);
return recursive ? makeRec(rec, nonrec) : makeAttrs(rec); return recursive ? makeRec(rec, nonrec) : makeAttrs(rec);
#endif
} }
#if 0
static void checkPatternVars(ATerm pos, ATermMap & map, Pattern pat) static void checkPatternVars(ATerm pos, ATermMap & map, Pattern pat)
{ {
ATerm name = sNoAlias; ATerm name = sNoAlias;
@ -261,6 +265,7 @@ static Expr stripIndentation(ATermList es)
return makeConcatStrings(ATreverse(es2)); return makeConcatStrings(ATreverse(es2));
} }
#endif
void backToString(yyscan_t scanner); void backToString(yyscan_t scanner);
@ -269,8 +274,11 @@ void backToIndString(yyscan_t scanner);
static Pos makeCurPos(YYLTYPE * loc, ParseData * data) static Pos makeCurPos(YYLTYPE * loc, ParseData * data)
{ {
return makePos(toATerm(data->path), Pos pos;
loc->first_line, loc->first_column); pos.file = data->path;
pos.line = loc->first_line;
pos.column = loc->first_column;
return pos;
} }
#define CUR_POS makeCurPos(yylocp, data) #define CUR_POS makeCurPos(yylocp, data)
@ -311,22 +319,31 @@ static void freeAndUnprotect(void * p)
%} %}
%union { %union {
ATerm t; nix::Expr * e;
ATermList ts; nix::ExprList * list;
struct { nix::ExprAttrs * attrs;
ATermList formals; nix::Formals * formals;
bool ellipsis; nix::Formal * formal;
} formals;
int n; int n;
char * id;
char * path;
char * uri;
std::list<std::string> * ids;
} }
%type <t> start expr expr_function expr_if expr_op %type <e> start expr expr_function expr_if expr_op
%type <t> expr_app expr_select expr_simple bind inheritsrc formal %type <e> expr_app expr_select expr_simple
%type <t> pattern %type <list> expr_list
%type <ts> binds ids attrpath expr_list string_parts ind_string_parts %type <attrs> binds
%type <ts> attrpath string_parts ind_string_parts
%type <formals> formals %type <formals> formals
%token <t> ID STR IND_STR PATH URI %type <formal> formal
%type <ids> ids
%token <id> ID ATTRPATH
%token <t> STR IND_STR
%token <n> INT %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
%token DOLLAR_CURLY /* == ${ */ %token DOLLAR_CURLY /* == ${ */
%token IND_STRING_OPEN IND_STRING_CLOSE %token IND_STRING_OPEN IND_STRING_CLOSE
@ -350,54 +367,63 @@ start: expr { data->result = $1; };
expr: expr_function; expr: expr_function;
expr_function expr_function
: pattern ':' expr_function : ID ':' expr_function
{ checkPatternVars(CUR_POS, $1); $$ = makeFunction($1, $3, CUR_POS); } { $$ = new ExprLambda(CUR_POS, $1, false, 0, $3); /* checkPatternVars(CUR_POS, $1); $$ = makeFunction($1, $3, CUR_POS); */ }
| ASSERT expr ';' expr_function | '{' formals '}' ':' expr_function
{ $$ = new ExprLambda(CUR_POS, "", true, $2, $5); }
| '{' formals '}' '@' ID ':' expr_function
{ $$ = new ExprLambda(CUR_POS, $5, true, $2, $7); }
| ID '@' '{' formals '}' ':' expr_function
{ $$ = new ExprLambda(CUR_POS, $1, true, $4, $7); }
/* | ASSERT expr ';' expr_function
{ $$ = makeAssert($2, $4, CUR_POS); } { $$ = makeAssert($2, $4, CUR_POS); }
*/
| WITH expr ';' expr_function | WITH expr ';' expr_function
{ $$ = makeWith($2, $4, CUR_POS); } { $$ = new ExprWith(CUR_POS, $2, $4); }
| LET binds IN expr_function | LET binds IN expr_function
{ $$ = makeSelect(fixAttrs(true, ATinsert($2, makeBindAttrPath(ATmakeList1(toATerm("<let-body>")), $4, CUR_POS))), toATerm("<let-body>")); } { $2->attrs["<let-body>"] = $4; $2->recursive = true; fixAttrs(*$2); $$ = new ExprSelect($2, "<let-body>"); }
| expr_if | expr_if
; ;
expr_if expr_if
: IF expr THEN expr ELSE expr : IF expr THEN expr ELSE expr { $$ = new ExprIf($2, $4, $6); }
{ $$ = makeIf($2, $4, $6); }
| expr_op | expr_op
; ;
expr_op expr_op
: '!' expr_op %prec NEG { $$ = makeOpNot($2); } : /* '!' expr_op %prec NEG { $$ = makeOpNot($2); }
| expr_op EQ expr_op { $$ = makeOpEq($1, $3); } | */
| expr_op NEQ expr_op { $$ = makeOpNEq($1, $3); } expr_op EQ expr_op { $$ = new ExprOpEq($1, $3); }
| expr_op AND expr_op { $$ = makeOpAnd($1, $3); } | expr_op NEQ expr_op { $$ = new ExprOpNEq($1, $3); }
| expr_op OR expr_op { $$ = makeOpOr($1, $3); } | expr_op AND expr_op { $$ = new ExprOpAnd($1, $3); }
| expr_op IMPL expr_op { $$ = makeOpImpl($1, $3); } | expr_op OR expr_op { $$ = new ExprOpOr($1, $3); }
| expr_op UPDATE expr_op { $$ = makeOpUpdate($1, $3); } | expr_op IMPL expr_op { $$ = new ExprOpImpl($1, $3); }
| expr_op UPDATE expr_op { $$ = new ExprOpUpdate($1, $3); }
/*
| expr_op '?' ID { $$ = makeOpHasAttr($1, $3); } | expr_op '?' ID { $$ = makeOpHasAttr($1, $3); }
| expr_op '+' expr_op { $$ = makeConcatStrings(ATmakeList2($1, $3)); } */
| expr_op CONCAT expr_op { $$ = makeOpConcat($1, $3); } | expr_op '+' expr_op { $$ = new ExprOpConcatStrings($1, $3); }
| expr_op CONCAT expr_op { $$ = new ExprOpConcatLists($1, $3); }
| expr_app | expr_app
; ;
expr_app expr_app
: expr_app expr_select : expr_app expr_select
{ $$ = makeCall($1, $2); } { $$ = new ExprApp($1, $2); }
| expr_select { $$ = $1; } | expr_select { $$ = $1; }
; ;
expr_select expr_select
: expr_select '.' ID : expr_select '.' ID
{ $$ = makeSelect($1, $3); } { $$ = new ExprSelect($1, $3); }
| expr_simple { $$ = $1; } | expr_simple { $$ = $1; }
; ;
expr_simple expr_simple
: ID { $$ = makeVar($1); } : ID { $$ = new ExprVar($1); }
| INT { $$ = makeInt($1); } | INT { $$ = new ExprInt($1); } /*
| '"' string_parts '"' { | '"' string_parts '"' {
/* For efficiency, and to simplify parse trees a bit. */ /* For efficiency, and to simplify parse trees a bit. * /
if ($2 == ATempty) $$ = makeStr(toATerm(""), ATempty); if ($2 == ATempty) $$ = makeStr(toATerm(""), ATempty);
else if (ATgetNext($2) == ATempty) $$ = ATgetFirst($2); else if (ATgetNext($2) == ATempty) $$ = ATgetFirst($2);
else $$ = makeConcatStrings(ATreverse($2)); else $$ = makeConcatStrings(ATreverse($2));
@ -405,18 +431,21 @@ expr_simple
| IND_STRING_OPEN ind_string_parts IND_STRING_CLOSE { | IND_STRING_OPEN ind_string_parts IND_STRING_CLOSE {
$$ = stripIndentation(ATreverse($2)); $$ = stripIndentation(ATreverse($2));
} }
| PATH { $$ = makePath(toATerm(absPath(aterm2String($1), data->basePath))); } */
| URI { $$ = makeStr($1, ATempty); } | PATH { $$ = new ExprPath(absPath($1, data->basePath)); }
| URI { $$ = new ExprString($1); }
| '(' expr ')' { $$ = $2; } | '(' expr ')' { $$ = $2; }
/*
/* Let expressions `let {..., body = ...}' are just desugared /* Let expressions `let {..., body = ...}' are just desugared
into `(rec {..., body = ...}).body'. */ into `(rec {..., body = ...}).body'. * /
| LET '{' binds '}' | LET '{' binds '}'
{ $$ = makeSelect(fixAttrs(true, $3), toATerm("body")); } { $$ = makeSelect(fixAttrs(true, $3), toATerm("body")); }
*/
| REC '{' binds '}' | REC '{' binds '}'
{ $$ = fixAttrs(true, $3); } { fixAttrs(*$3); $3->recursive = true; $$ = $3; }
| '{' binds '}' | '{' binds '}'
{ $$ = fixAttrs(false, $2); } { fixAttrs(*$2); $$ = $2; }
| '[' expr_list ']' { $$ = makeList(ATreverse($2)); } | '[' expr_list ']' { $$ = $2; }
; ;
string_parts string_parts
@ -431,63 +460,56 @@ ind_string_parts
| { $$ = ATempty; } | { $$ = ATempty; }
; ;
pattern
: ID { $$ = makeVarPat($1); }
| '{' formals '}' { $$ = makeAttrsPat($2.formals, $2.ellipsis ? eTrue : eFalse, sNoAlias); }
| '{' formals '}' '@' ID { $$ = makeAttrsPat($2.formals, $2.ellipsis ? eTrue : eFalse, $5); }
| ID '@' '{' formals '}' { $$ = makeAttrsPat($4.formals, $4.ellipsis ? eTrue : eFalse, $1); }
;
binds binds
: binds bind { $$ = ATinsert($1, $2); } : binds ID '=' expr ';' { $$ = $1; $$->attrs[$2] = $4; }
| { $$ = ATempty; } | binds INHERIT ids ';'
{ $$ = $1;
foreach (list<string>::iterator, i, *$3)
$$->inherited.push_back(*i);
}
| binds INHERIT '(' expr ')' ids ';'
{ $$ = $1;
/* !!! Should ensure sharing of the expression in $4. */
foreach (list<string>::iterator, i, *$6)
$$->attrs[*i] = new ExprSelect($4, *i);
}
| { $$ = new ExprAttrs; }
; ;
bind ids
: attrpath '=' expr ';' : ids ID { $$ = $1; $1->push_back($2); /* !!! dangerous */ }
{ $$ = makeBindAttrPath(ATreverse($1), $3, CUR_POS); } | { $$ = new list<string>; }
| INHERIT inheritsrc ids ';'
{ $$ = makeInherit($2, $3, CUR_POS); }
; ;
inheritsrc
: '(' expr ')' { $$ = $2; }
| { $$ = makeScope(); }
;
ids: ids ID { $$ = ATinsert($1, $2); } | { $$ = ATempty; };
attrpath attrpath
: attrpath '.' ID { $$ = ATinsert($1, $3); } : attrpath '.' ID { $$ = ATinsert($1, $3); }
| ID { $$ = ATmakeList1($1); } | ID { $$ = ATmakeList1($1); }
; ;
expr_list expr_list
: expr_list expr_select { $$ = ATinsert($1, $2); } : expr_list expr_select { $$ = $1; $1->elems.push_back($2); /* !!! dangerous */ }
| { $$ = ATempty; } | { $$ = new ExprList; }
; ;
formals formals
: formal ',' formals /* !!! right recursive */ : formal ',' formals
{ $$.formals = ATinsert($3.formals, $1); $$.ellipsis = $3.ellipsis; } { $$ = $3; $$->formals.push_front(*$1); /* !!! dangerous */ }
| formal | formal
{ $$.formals = ATinsert(ATempty, $1); $$.ellipsis = false; } { $$ = new Formals; $$->formals.push_back(*$1); $$->ellipsis = false; }
| |
{ $$.formals = ATempty; $$.ellipsis = false; } { $$ = new Formals; $$->ellipsis = false; }
| ELLIPSIS | ELLIPSIS
{ $$.formals = ATempty; $$.ellipsis = true; } { $$ = new Formals; $$->ellipsis = true; }
; ;
formal formal
: ID { $$ = makeFormal($1, makeNoDefaultValue()); } : ID { $$ = new Formal($1, 0); }
| ID '?' expr { $$ = makeFormal($1, makeDefaultValue($3)); } | ID '?' expr { $$ = new Formal($1, $3); }
; ;
%% %%
#include "eval.hh"
#include <sys/types.h> #include <sys/types.h>
#include <sys/stat.h> #include <sys/stat.h>
#include <fcntl.h> #include <fcntl.h>
@ -497,9 +519,7 @@ formal
namespace nix { namespace nix {
static Expr parse(EvalState & state, static Expr * parse(const char * text, const Path & path, const Path & basePath)
const char * text, const Path & path,
const Path & basePath)
{ {
yyscan_t scanner; yyscan_t scanner;
ParseData data; ParseData data;
@ -523,7 +543,7 @@ static Expr parse(EvalState & state,
} }
Expr parseExprFromFile(EvalState & state, Path path) Expr * parseExprFromFile(Path path)
{ {
assert(path[0] == '/'); assert(path[0] == '/');
@ -544,14 +564,13 @@ Expr parseExprFromFile(EvalState & state, Path path)
path = canonPath(path + "/default.nix"); path = canonPath(path + "/default.nix");
/* Read and parse the input file. */ /* Read and parse the input file. */
return parse(state, readFile(path).c_str(), path, dirOf(path)); return parse(readFile(path).c_str(), path, dirOf(path));
} }
Expr parseExprFromString(EvalState & state, Expr * parseExprFromString(const string & s, const Path & basePath)
const string & s, const Path & basePath)
{ {
return parse(state, s.c_str(), "(string)", basePath); return parse(s.c_str(), "(string)", basePath);
} }

38
src/libexpr/primops.cc
View file

@ -5,7 +5,6 @@
#include "util.hh" #include "util.hh"
#include "archive.hh" #include "archive.hh"
#include "value-to-xml.hh" #include "value-to-xml.hh"
#include "nixexpr-ast.hh"
#include "parser.hh" #include "parser.hh"
#include "names.hh" #include "names.hh"
@ -281,7 +280,7 @@ static void prim_derivationStrict(EvalState & state, Value * * args, Value & v)
state.forceAttrs(*args[0]); state.forceAttrs(*args[0]);
/* Figure out the name first (for stack backtraces). */ /* Figure out the name first (for stack backtraces). */
Bindings::iterator attr = args[0]->attrs->find(toATerm("name")); Bindings::iterator attr = args[0]->attrs->find("name");
if (attr == args[0]->attrs->end()) if (attr == args[0]->attrs->end())
throw EvalError("required attribute `name' missing"); throw EvalError("required attribute `name' missing");
string drvName; string drvName;
@ -302,7 +301,7 @@ static void prim_derivationStrict(EvalState & state, Value * * args, Value & v)
bool outputHashRecursive = false; bool outputHashRecursive = false;
foreach (Bindings::iterator, i, *args[0]->attrs) { foreach (Bindings::iterator, i, *args[0]->attrs) {
string key = aterm2String(i->first); string key = i->first;
startNest(nest, lvlVomit, format("processing attribute `%1%'") % key); startNest(nest, lvlVomit, format("processing attribute `%1%'") % key);
try { try {
@ -449,8 +448,8 @@ static void prim_derivationStrict(EvalState & state, Value * * args, Value & v)
/* !!! assumes a single output */ /* !!! assumes a single output */
state.mkAttrs(v); state.mkAttrs(v);
mkString((*v.attrs)[toATerm("outPath")], outPath, singleton<PathSet>(drvPath)); mkString((*v.attrs)["outPath"], outPath, singleton<PathSet>(drvPath));
mkString((*v.attrs)[toATerm("drvPath")], drvPath, singleton<PathSet>("=" + drvPath)); mkString((*v.attrs)["drvPath"], drvPath, singleton<PathSet>("=" + drvPath));
} }
@ -655,7 +654,7 @@ static void prim_attrNames(EvalState & state, Value * * args, Value & v)
StringSet names; StringSet names;
foreach (Bindings::iterator, i, *args[0]->attrs) foreach (Bindings::iterator, i, *args[0]->attrs)
names.insert(aterm2String(i->first)); names.insert(i->first);
unsigned int n = 0; unsigned int n = 0;
foreach (StringSet::iterator, i, names) foreach (StringSet::iterator, i, names)
@ -668,7 +667,7 @@ static void prim_getAttr(EvalState & state, Value * * args, Value & v)
{ {
string attr = state.forceStringNoCtx(*args[0]); string attr = state.forceStringNoCtx(*args[0]);
state.forceAttrs(*args[1]); state.forceAttrs(*args[1]);
Bindings::iterator i = args[1]->attrs->find(toATerm(attr)); Bindings::iterator i = args[1]->attrs->find(attr);
if (i == args[1]->attrs->end()) if (i == args[1]->attrs->end())
throw EvalError(format("attribute `%1%' missing") % attr); throw EvalError(format("attribute `%1%' missing") % attr);
state.forceValue(i->second); state.forceValue(i->second);
@ -681,7 +680,7 @@ static void prim_hasAttr(EvalState & state, Value * * args, Value & v)
{ {
string attr = state.forceStringNoCtx(*args[0]); string attr = state.forceStringNoCtx(*args[0]);
state.forceAttrs(*args[1]); state.forceAttrs(*args[1]);
mkBool(v, args[1]->attrs->find(toATerm(attr)) != args[1]->attrs->end()); mkBool(v, args[1]->attrs->find(attr) != args[1]->attrs->end());
} }
@ -702,7 +701,7 @@ static void prim_removeAttrs(EvalState & state, Value * * args, Value & v)
for (unsigned int i = 0; i < args[1]->list.length; ++i) { for (unsigned int i = 0; i < args[1]->list.length; ++i) {
state.forceStringNoCtx(args[1]->list.elems[i]); state.forceStringNoCtx(args[1]->list.elems[i]);
v.attrs->erase(toATerm(args[1]->list.elems[i].string.s)); v.attrs->erase(args[1]->list.elems[i].string.s);
} }
} }
@ -721,16 +720,16 @@ static void prim_listToAttrs(EvalState & state, Value * * args, Value & v)
Value & v2(args[0]->list.elems[i]); Value & v2(args[0]->list.elems[i]);
state.forceAttrs(v2); state.forceAttrs(v2);
Bindings::iterator j = v2.attrs->find(toATerm("name")); Bindings::iterator j = v2.attrs->find("name");
if (j == v2.attrs->end()) if (j == v2.attrs->end())
throw TypeError("`name' attribute missing in a call to `listToAttrs'"); throw TypeError("`name' attribute missing in a call to `listToAttrs'");
string name = state.forceStringNoCtx(j->second); string name = state.forceStringNoCtx(j->second);
j = v2.attrs->find(toATerm("value")); j = v2.attrs->find("value");
if (j == v2.attrs->end()) if (j == v2.attrs->end())
throw TypeError("`value' attribute missing in a call to `listToAttrs'"); throw TypeError("`value' attribute missing in a call to `listToAttrs'");
(*v.attrs)[toATerm(name)] = j->second; // !!! sharing? (*v.attrs)[name] = j->second; // !!! sharing?
} }
} }
@ -977,8 +976,8 @@ static void prim_parseDrvName(EvalState & state, Value * * args, Value & v)
string name = state.forceStringNoCtx(*args[0]); string name = state.forceStringNoCtx(*args[0]);
DrvName parsed(name); DrvName parsed(name);
state.mkAttrs(v); state.mkAttrs(v);
mkString((*v.attrs)[toATerm("name")], parsed.name); mkString((*v.attrs)["name"], parsed.name);
mkString((*v.attrs)[toATerm("version")], parsed.version); mkString((*v.attrs)["version"], parsed.version);
} }
@ -999,10 +998,9 @@ void EvalState::createBaseEnv()
{ {
baseEnv.up = 0; baseEnv.up = 0;
{ Value & v = baseEnv.bindings[toATerm("builtins")]; Value & builtins = baseEnv.bindings["builtins"];
v.type = tAttrs; builtins.type = tAttrs;
v.attrs = new Bindings; builtins.attrs = new Bindings;
}
/* Add global constants such as `true' to the base environment. */ /* Add global constants such as `true' to the base environment. */
Value v; Value v;
@ -1025,8 +1023,8 @@ void EvalState::createBaseEnv()
/* Add a wrapper around the derivation primop that computes the /* Add a wrapper around the derivation primop that computes the
`drvPath' and `outPath' attributes lazily. */ `drvPath' and `outPath' attributes lazily. */
string s = "attrs: let res = derivationStrict attrs; in attrs // { drvPath = res.drvPath; outPath = res.outPath; type = \"derivation\"; }"; string s = "attrs: let res = derivationStrict attrs; in attrs // { drvPath = res.drvPath; outPath = res.outPath; type = \"derivation\"; }";
mkThunk(v, baseEnv, parseExprFromString(*this, s, "/")); //mkThunk(v, baseEnv, parseExprFromString(s, "/"));
addConstant("derivation", v); //addConstant("derivation", v);
// Miscellaneous // Miscellaneous
addPrimOp("import", 1, prim_import); addPrimOp("import", 1, prim_import);

43
src/libexpr/value-to-xml.cc
View file

@ -1,7 +1,5 @@
#include "value-to-xml.hh" #include "value-to-xml.hh"
#include "xml-writer.hh" #include "xml-writer.hh"
#include "nixexpr-ast.hh"
#include "aterm.hh"
#include "util.hh" #include "util.hh"
#include <cstdlib> #include <cstdlib>
@ -27,31 +25,10 @@ static void showAttrs(EvalState & state, bool strict, Bindings & attrs,
{ {
StringSet names; StringSet names;
foreach (Bindings::iterator, i, attrs) foreach (Bindings::iterator, i, attrs)
names.insert(aterm2String(i->first)); names.insert(i->first);
foreach (StringSet::iterator, i, names) { foreach (StringSet::iterator, i, names) {
XMLOpenElement _(doc, "attr", singletonAttrs("name", *i)); XMLOpenElement _(doc, "attr", singletonAttrs("name", *i));
printValueAsXML(state, strict, attrs[toATerm(*i)], doc, context, drvsSeen); printValueAsXML(state, strict, attrs[*i], doc, context, drvsSeen);
}
}
static void printPatternAsXML(Pattern pat, XMLWriter & doc)
{
ATerm name;
ATermList formals;
ATermBool ellipsis;
if (matchVarPat(pat, name))
doc.writeEmptyElement("varpat", singletonAttrs("name", aterm2String(name)));
else if (matchAttrsPat(pat, formals, ellipsis, name)) {
XMLAttrs attrs;
if (name != sNoAlias) attrs["name"] = aterm2String(name);
if (ellipsis == eTrue) attrs["ellipsis"] = "1";
XMLOpenElement _(doc, "attrspat", attrs);
for (ATermIterator i(formals); i; ++i) {
Expr name; ATerm dummy;
if (!matchFormal(*i, name, dummy)) abort();
doc.writeEmptyElement("attr", singletonAttrs("name", aterm2String(name)));
}
} }
} }
@ -90,14 +67,14 @@ static void printValueAsXML(EvalState & state, bool strict, Value & v,
if (state.isDerivation(v)) { if (state.isDerivation(v)) {
XMLAttrs xmlAttrs; XMLAttrs xmlAttrs;
Bindings::iterator a = v.attrs->find(toATerm("derivation")); Bindings::iterator a = v.attrs->find("derivation");
Path drvPath; Path drvPath;
a = v.attrs->find(toATerm("drvPath")); a = v.attrs->find("drvPath");
if (a != v.attrs->end() && a->second.type == tString) if (a != v.attrs->end() && a->second.type == tString)
xmlAttrs["drvPath"] = drvPath = a->second.string.s; xmlAttrs["drvPath"] = drvPath = a->second.string.s;
a = v.attrs->find(toATerm("outPath")); a = v.attrs->find("outPath");
if (a != v.attrs->end() && a->second.type == tString) if (a != v.attrs->end() && a->second.type == tString)
xmlAttrs["outPath"] = a->second.string.s; xmlAttrs["outPath"] = a->second.string.s;
@ -126,7 +103,15 @@ static void printValueAsXML(EvalState & state, bool strict, Value & v,
case tLambda: { case tLambda: {
XMLOpenElement _(doc, "function"); XMLOpenElement _(doc, "function");
printPatternAsXML(v.lambda.pat, doc); if (v.lambda.fun->matchAttrs) {
XMLAttrs attrs;
if (!v.lambda.fun->arg.empty()) attrs["name"] = v.lambda.fun->arg;
if (v.lambda.fun->formals->ellipsis) attrs["ellipsis"] = "1";
XMLOpenElement _(doc, "attrspat", attrs);
foreach (Formals::Formals_::iterator, i, v.lambda.fun->formals->formals)
doc.writeEmptyElement("attr", singletonAttrs("name", i->name));
} else
doc.writeEmptyElement("varpat", singletonAttrs("name", v.lambda.fun->arg));
break; break;
} }

4
src/libmain/shared.cc
View file

@ -177,7 +177,7 @@ static void initAndRun(int argc, char * * argv)
if (lt != "") setLogType(lt); if (lt != "") setLogType(lt);
/* ATerm stuff. !!! find a better place to put this */ /* ATerm stuff. !!! find a better place to put this */
initDerivationsHelpers(); //initDerivationsHelpers();
/* Put the arguments in a vector. */ /* Put the arguments in a vector. */
Strings args, remaining; Strings args, remaining;
@ -335,7 +335,7 @@ int main(int argc, char * * argv)
/* ATerm setup. */ /* ATerm setup. */
ATerm bottomOfStack; ATerm bottomOfStack;
ATinit(argc, argv, &bottomOfStack); //ATinit(argc, argv, &bottomOfStack);
/* Turn on buffering for cerr. */ /* Turn on buffering for cerr. */
#if HAVE_PUBSETBUF #if HAVE_PUBSETBUF

5
src/nix-env/nix-env.cc
View file

@ -6,7 +6,6 @@
#include "parser.hh" #include "parser.hh"
#include "eval.hh" #include "eval.hh"
#include "help.txt.hh" #include "help.txt.hh"
#include "nixexpr-ast.hh"
#include "get-drvs.hh" #include "get-drvs.hh"
#include "attr-path.hh" #include "attr-path.hh"
#include "pathlocks.hh" #include "pathlocks.hh"
@ -143,9 +142,9 @@ static void getAllExprs(EvalState & state,
} }
static Expr loadSourceExpr(EvalState & state, const Path & path) static Expr * loadSourceExpr(EvalState & state, const Path & path)
{ {
if (isNixExpr(path)) return parseExprFromFile(state, absPath(path)); if (isNixExpr(path)) return parseExprFromFile(absPath(path));
/* The path is a directory. Put the Nix expressions in the /* The path is a directory. Put the Nix expressions in the
directory in an attribute set, with the file name of each directory in an attribute set, with the file name of each

10
src/nix-instantiate/nix-instantiate.cc
View file

@ -23,12 +23,12 @@ void printHelp()
} }
static Expr parseStdin(EvalState & state) static Expr * parseStdin(EvalState & state)
{ {
startNest(nest, lvlTalkative, format("parsing standard input")); startNest(nest, lvlTalkative, format("parsing standard input"));
string s, s2; string s, s2;
while (getline(std::cin, s2)) s += s2 + "\n"; while (getline(std::cin, s2)) s += s2 + "\n";
return parseExprFromString(state, s, absPath(".")); return parseExprFromString(s, absPath("."));
} }
@ -39,7 +39,7 @@ static bool indirectRoot = false;
void processExpr(EvalState & state, const Strings & attrPaths, void processExpr(EvalState & state, const Strings & attrPaths,
bool parseOnly, bool strict, const Bindings & autoArgs, bool parseOnly, bool strict, const Bindings & autoArgs,
bool evalOnly, bool xmlOutput, Expr e) bool evalOnly, bool xmlOutput, Expr * e)
{ {
if (parseOnly) if (parseOnly)
std::cout << format("%1%\n"); std::cout << format("%1%\n");
@ -129,14 +129,14 @@ void run(Strings args)
store = openStore(); store = openStore();
if (readStdin) { if (readStdin) {
Expr e = parseStdin(state); Expr * e = parseStdin(state);
processExpr(state, attrPaths, parseOnly, strict, autoArgs, processExpr(state, attrPaths, parseOnly, strict, autoArgs,
evalOnly, xmlOutput, e); evalOnly, xmlOutput, e);
} }
foreach (Strings::iterator, i, files) { foreach (Strings::iterator, i, files) {
Path path = absPath(*i); Path path = absPath(*i);
Expr e = parseExprFromFile(state, path); Expr * e = parseExprFromFile(path);
processExpr(state, attrPaths, parseOnly, strict, autoArgs, processExpr(state, attrPaths, parseOnly, strict, autoArgs,
evalOnly, xmlOutput, e); evalOnly, xmlOutput, e);
} }