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* More XML output. `--strict' to strictly evaluate attribute sets and 

so on.
* Removed `--print-args', it's subsumed by `--eval-only --xml'.
This commit is contained in:
Eelco Dolstra 2006-08-16 21:59:53 +00:00
parent 18e4ac0fc6
commit 22ba63df16
2 changed files with 91 additions and 46 deletions
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9
src/nix-instantiate/help.txt
View File

@ -18,3 +18,12 @@ Options:
--attr / -A PATH: select an attribute from the top-level expression
--add-root: add garbage collector roots for the result
For --eval-only / --parse-only:
--xml: print an XML representation of the abstract syntax tree
For --eval-only:
--strict: compute attributes and list elements, rather than being
lazy

128
src/nix-instantiate/main.cc
View File

@ -42,13 +42,14 @@ static XMLAttrs singletonAttrs(const string & name, const string & value)
}
static void printTermAsXML(EvalState & state, Expr e, XMLWriter & doc)
static void printTermAsXML(Expr e, XMLWriter & doc)
{
XMLAttrs attrs;
ATerm s;
int i;
ATermList as;
ATermList as, formals;
ATerm body, pos;
if (matchStr(e, s))
doc.writeEmptyElement("string", singletonAttrs("value", aterm2String(s)));
@ -62,7 +63,13 @@ static void printTermAsXML(EvalState & state, Expr e, XMLWriter & doc)
doc.writeEmptyElement("null");
else if (matchInt(e, i))
doc.writeEmptyElement("int",singletonAttrs("value", (format("%1%") % i).str()));
doc.writeEmptyElement("int", singletonAttrs("value", (format("%1%") % i).str()));
else if (e == eTrue)
doc.writeEmptyElement("bool", singletonAttrs("value", "true"));
else if (e == eFalse)
doc.writeEmptyElement("bool", singletonAttrs("value", "false"));
else if (matchAttrs(e, as)) {
XMLOpenElement _(doc, "attrs");
@ -70,57 +77,44 @@ static void printTermAsXML(EvalState & state, Expr e, XMLWriter & doc)
queryAllAttrs(e, attrs);
for (ATermMap::const_iterator i = attrs.begin(); i != attrs.end(); ++i) {
XMLOpenElement _(doc, "attr", singletonAttrs("name", aterm2String(i->key)));
printTermAsXML(state, i->value, doc);
printTermAsXML(i->value, doc);
}
}
else if (matchFunction(e, formals, body, pos)) {
XMLOpenElement _(doc, "function");
for (ATermIterator i(formals); i; ++i) {
Expr name; ValidValues valids; ATerm dummy;
if (!matchFormal(*i, name, valids, dummy)) abort();
XMLOpenElement _(doc, "arg", singletonAttrs("name", aterm2String(name)));
ATermList valids2;
if (matchValidValues(valids, valids2)) {
for (ATermIterator j(valids2); j; ++j) {
XMLOpenElement _(doc, "value");
printTermAsXML(*j, doc);
}
}
}
}
else
doc.writeEmptyElement("unknown");
doc.writeEmptyElement("unevaluated");
}
static void printResult(EvalState & state, Expr e,
bool evalOnly, bool printArgs, bool xmlOutput,
const ATermMap & autoArgs)
bool evalOnly, bool xmlOutput, const ATermMap & autoArgs)
{
if (evalOnly)
if (xmlOutput) {
XMLWriter doc(true, cout);
XMLOpenElement root(doc, "expr");
printTermAsXML(state, e, doc);
printTermAsXML(e, doc);
} else
cout << format("%1%\n") % e;
else if (printArgs) {
XMLWriter doc(true, cout);
XMLOpenElement root(doc, "args");
ATermList formals;
ATerm body, pos;
if (matchFunction(e, formals, body, pos)) {
for (ATermIterator i(formals); i; ++i) {
Expr name; ValidValues valids; ATerm dummy;
if (!matchFormal(*i, name, valids, dummy)) abort();
XMLAttrs attrs;
attrs["name"] = aterm2String(name);
XMLOpenElement elem(doc, "arg", attrs);
ATermList valids2;
if (matchValidValues(valids, valids2)) {
for (ATermIterator j(valids2); j; ++j) {
Expr e = evalExpr(state, *j);
XMLAttrs attrs;
attrs["value"] = showValue(e);
XMLOpenElement elem(doc, "value", attrs);
}
}
}
} else
printMsg(lvlError, "warning: expression does not evaluate to a function");
}
else {
DrvInfos drvs;
getDerivations(state, e, "", autoArgs, drvs);
@ -138,6 +132,49 @@ static void printResult(EvalState & state, Expr e,
}
Expr strictEval(EvalState & state, Expr e)
{
e = evalExpr(state, e);
ATermList as;
if (matchAttrs(e, as)) {
ATermList as2 = ATempty;
for (ATermIterator i(as); i; ++i) {
ATerm name; Expr e; ATerm pos;
if (!matchBind(*i, name, e, pos)) abort(); /* can't happen */
as2 = ATinsert(as2, makeBind(name, strictEval(state, e), pos));
}
return makeAttrs(ATreverse(as2));
}
ATermList formals;
ATerm body, pos;
if (matchFunction(e, formals, body, pos)) {
ATermList formals2 = ATempty;
for (ATermIterator i(formals); i; ++i) {
Expr name; ValidValues valids; ATerm dummy;
if (!matchFormal(*i, name, valids, dummy)) abort();
ATermList valids2;
if (matchValidValues(valids, valids2)) {
ATermList valids3 = ATempty;
for (ATermIterator j(valids2); j; ++j)
valids3 = ATinsert(valids3, strictEval(state, *j));
valids = makeValidValues(ATreverse(valids3));
}
formals2 = ATinsert(formals2, makeFormal(name, valids, dummy));
}
return makeFunction(ATreverse(formals2), body, pos);
}
return e;
}
void run(Strings args)
{
EvalState state;
@ -145,8 +182,8 @@ void run(Strings args)
bool readStdin = false;
bool evalOnly = false;
bool parseOnly = false;
bool printArgs = false;
bool xmlOutput = false;
bool strict = false;
string attrPath;
ATermMap autoArgs(128);
@ -165,10 +202,6 @@ void run(Strings args)
readOnlyMode = true;
parseOnly = evalOnly = true;
}
else if (arg == "--print-args") {
readOnlyMode = true;
printArgs = true;
}
else if (arg == "--attr" || arg == "-A") {
if (i == args.end())
throw UsageError("`--attr' requires an argument");
@ -192,6 +225,8 @@ void run(Strings args)
indirectRoot = true;
else if (arg == "--xml")
xmlOutput = true;
else if (arg == "--strict")
strict = true;
else if (arg[0] == '-')
throw UsageError(format("unknown flag `%1%'") % arg);
else
@ -203,7 +238,7 @@ void run(Strings args)
if (readStdin) {
Expr e = findAlongAttrPath(state, attrPath, parseStdin(state));
if (!parseOnly) e = evalExpr(state, e);
printResult(state, e, evalOnly, printArgs, xmlOutput, autoArgs);
printResult(state, e, evalOnly, xmlOutput, autoArgs);
}
for (Strings::iterator i = files.begin();
@ -213,7 +248,8 @@ void run(Strings args)
Expr e = findAlongAttrPath(state, attrPath,
parseExprFromFile(state, path));
if (!parseOnly) e = evalExpr(state, e);
printResult(state, e, evalOnly, printArgs, xmlOutput, autoArgs);
if (strict) e = strictEval(state, e);
printResult(state, e, evalOnly, xmlOutput, autoArgs);
}
printEvalStats(state);