* Removed processBinding, instead we now apply toString to all

derivation attributes to flatten them into strings.  This is
  possible since string can nowadays be wrapped in contexts that
  describe the derivations/sources referenced by the evaluation of the
  string.
This commit is contained in:
Eelco Dolstra 2006-08-28 13:31:06 +00:00
parent 8a6080eb14
commit 1fca76870b
2 changed files with 139 additions and 139 deletions

View file

@ -321,7 +321,7 @@ Expr evalExpr2(EvalState & state, Expr e)
/* Normal forms. */
if (sym == symStr ||
sym == symPath ||
sym == symSubPath ||
sym == symSubPath || /* !!! evaluate */
sym == symUri ||
sym == symNull ||
sym == symInt ||

View file

@ -69,6 +69,84 @@ static Expr primImport(EvalState & state, const ATermVector & args)
}
void toString(EvalState & state, Expr e,
ATermList & context, string & result)
{
e = evalExpr(state, e);
ATerm s;
ATermList es;
int n;
Expr e2;
while (matchContext(e, es, e2)) {
e = e2;
for (ATermIterator i(es); i; ++i)
context = ATinsert(context, *i);
}
/* Note that `false' is represented as an empty string for shell
scripting convenience, just like `null'. */
if (matchStr(e, s)) result += aterm2String(s);
else if (matchUri(e, s)) result += aterm2String(s);
else if (e == eTrue) result += "1";
else if (e == eFalse) ;
else if (matchInt(e, n)) result += int2String(n);
else if (matchNull(e)) ;
else if (matchAttrs(e, es)) {
Expr a = queryAttr(e, "type");
if (a && evalString(state, a) == "derivation") {
Expr a2 = queryAttr(e, "outPath");
if (!a2) throw EvalError("output path missing");
result += evalPath(state, a2);
context = ATinsert(context, e);
}
else throw TypeError("cannot convert an attribute set to a string");
}
else if (matchPath(e, s)) {
Path path(canonPath(aterm2String(s)));
if (!isStorePath(path)) {
if (isDerivation(path))
throw EvalError(format("file names are not allowed to end in `%1%'")
% drvExtension);
Path dstPath;
if (state.srcToStore[path] != "")
dstPath = state.srcToStore[path];
else {
dstPath = addToStore(path);
state.srcToStore[path] = dstPath;
printMsg(lvlChatty, format("copied source `%1%' -> `%2%'")
% path % dstPath);
}
path = dstPath;
}
result += path;
context = ATinsert(context, makePath(toATerm(path)));
}
else if (matchList(e, es)) {
bool first = true;
for (ATermIterator i(es); i; ++i) {
if (!first) result += " "; else first = false;
toString(state, *i, context, result);
}
}
else throw TypeError(format("%1% is not allowed as a derivation argument") % showType(e));
}
/* Returns the hash of a derivation modulo fixed-output
subderivations. A fixed-output derivation is a derivation with one
output (`out') for which an expected hash and hash algorithm are
@ -124,119 +202,6 @@ static Hash hashDerivationModulo(EvalState & state, Derivation drv)
}
static void processBinding(EvalState & state, Expr e, Derivation & drv,
Strings & ss)
{
e = evalExpr(state, e);
ATerm s;
ATermList es;
int n;
Expr e1, e2;
if (matchContext(e, es, e2)) {
e = e2;
for (ATermIterator i(es); i; ++i) {
Strings dummy;
processBinding(state, *i, drv, dummy);
}
}
if (matchStr(e, s)) ss.push_back(aterm2String(s));
else if (matchUri(e, s)) ss.push_back(aterm2String(s));
else if (e == eTrue) ss.push_back("1");
else if (e == eFalse) ss.push_back("");
else if (matchInt(e, n)) ss.push_back(int2String(n));
else if (matchAttrs(e, es)) {
Expr a = queryAttr(e, "type");
if (a && evalString(state, a) == "derivation") {
a = queryAttr(e, "drvPath");
if (!a) throw EvalError("derivation name missing");
Path drvPath = evalPath(state, a);
a = queryAttr(e, "outPath");
if (!a) throw EvalError("output path missing");
/* !!! supports only single output path */
Path outPath = evalPath(state, a);
drv.inputDrvs[drvPath] = singleton<StringSet>("out");
ss.push_back(outPath);
}
else throw TypeError("attribute sets in derivations must be derivations");
}
else if (matchPath(e, s)) {
Path srcPath(canonPath(aterm2String(s)));
if (isStorePath(srcPath)) {
printMsg(lvlChatty, format("using store path `%1%' as source")
% srcPath);
drv.inputSrcs.insert(srcPath);
ss.push_back(srcPath);
}
else {
if (isDerivation(srcPath))
throw EvalError(format("file names are not allowed to end in `%1%'")
% drvExtension);
Path dstPath;
if (state.srcToStore[srcPath] != "")
dstPath = state.srcToStore[srcPath];
else {
dstPath = addToStore(srcPath);
state.srcToStore[srcPath] = dstPath;
printMsg(lvlChatty, format("copied source `%1%' -> `%2%'")
% srcPath % dstPath);
}
drv.inputSrcs.insert(dstPath);
ss.push_back(dstPath);
}
}
else if (matchList(e, es)) {
for (ATermIterator i(es); i; ++i) {
startNest(nest, lvlVomit, format("processing list element"));
processBinding(state, evalExpr(state, *i), drv, ss);
}
}
else if (matchNull(e)) ss.push_back("");
else if (matchSubPath(e, e1, e2)) {
static bool warn = false;
if (!warn) {
printMsg(lvlError, "warning: the subpath operator (~) is deprecated, use string concatenation (+) instead");
warn = true;
}
Strings ss2;
processBinding(state, evalExpr(state, e1), drv, ss2);
if (ss2.size() != 1)
throw TypeError("left-hand side of `~' operator cannot be a list");
e2 = evalExpr(state, e2);
if (!(matchStr(e2, s) || matchPath(e2, s)))
throw TypeError("right-hand side of `~' operator must be a path or string");
ss.push_back(canonPath(ss2.front() + "/" + aterm2String(s)));
}
else throw TypeError(format("%1% is not allowed as a derivation argument") % showType(e));
}
static string concatStrings(const Strings & ss)
{
string s;
bool first = true;
for (Strings::const_iterator i = ss.begin(); i != ss.end(); ++i) {
if (!first) s += " "; else first = false;
s += *i;
}
return s;
}
/* Construct (as a unobservable side effect) a Nix derivation
expression that performs the derivation described by the argument
set. Returns the original set extended with the following
@ -274,9 +239,67 @@ static Expr primDerivationStrict(EvalState & state, const ATermVector & args)
if (!matchAttrRHS(rhs, value, pos)) abort();
startNest(nest, lvlVomit, format("processing attribute `%1%'") % key);
Strings ss;
try {
processBinding(state, value, drv, ss);
ATermList context = ATempty;
/* The `args' attribute is special: it supplies the
command-line arguments to the builder. */
if (key == "args") {
ATermList es;
value = evalExpr(state, value);
if (!matchList(value, es)) throw Error(format("`args' should be a list %1%") % value);
for (ATermIterator i(es); i; ++i) {
string s;
toString(state, *i, context, s);
drv.args.push_back(s);
}
}
/* All other attributes are passed to the builder through
the environment. */
else {
string s;
toString(state, value, context, s);
drv.env[key] = s;
if (key == "builder") drv.builder = s;
else if (key == "system") drv.platform = s;
else if (key == "name") drvName = s;
else if (key == "outputHash") outputHash = s;
else if (key == "outputHashAlgo") outputHashAlgo = s;
else if (key == "outputHashMode") {
if (s == "recursive") outputHashRecursive = true;
else if (s == "flat") outputHashRecursive = false;
else throw EvalError(format("invalid value `%1%' for `outputHashMode' attribute") % s);
}
}
/* Everything in the context of the expression should be
added as dependencies of the resulting derivation. */
for (ATermIterator i(context); i; ++i) {
ATerm s;
ATermList as;
if (matchPath(*i, s)) {
assert(isStorePath(aterm2String(s)));
drv.inputSrcs.insert(aterm2String(s));
}
else if (matchAttrs(*i, as)) {
Expr a = queryAttr(*i, "type");
assert(a && evalString(state, a) == "derivation");
Expr a2 = queryAttr(*i, "drvPath");
if (!a2) throw EvalError("derivation path missing");
drv.inputDrvs[evalPath(state, a2)] = singleton<StringSet>("out");
}
else abort();
}
} catch (Error & e) {
e.addPrefix(format("while processing the derivation attribute `%1%' at %2%:\n")
% key % showPos(pos));
@ -285,29 +308,6 @@ static Expr primDerivationStrict(EvalState & state, const ATermVector & args)
throw;
}
/* The `args' attribute is special: it supplies the
command-line arguments to the builder. */
if (key == "args") {
for (Strings::iterator i = ss.begin(); i != ss.end(); ++i)
drv.args.push_back(*i);
}
/* All other attributes are passed to the builder through the
environment. */
else {
string s = concatStrings(ss);
drv.env[key] = s;
if (key == "builder") drv.builder = s;
else if (key == "system") drv.platform = s;
else if (key == "name") drvName = s;
else if (key == "outputHash") outputHash = s;
else if (key == "outputHashAlgo") outputHashAlgo = s;
else if (key == "outputHashMode") {
if (s == "recursive") outputHashRecursive = true;
else if (s == "flat") outputHashRecursive = false;
else throw EvalError(format("invalid value `%1%' for `outputHashMode' attribute") % s);
}
}
}
/* Do we have all required attributes? */