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* Mode --parse-only' to parse the input (on stdin, -'), and print

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out the AST as an ATerm.
* Mode `--eval-only' to parse and evaluate the input, and print the
  resulting normal form as an ATerm.

Neither of these modes require store/DB write permission.
This commit is contained in:
Eelco Dolstra 2004-10-26 16:59:36 +00:00
parent 37d7abd694
commit ee401afad8
1 changed files with 28 additions and 8 deletions
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36
src/nix-instantiate/main.cc
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@ -15,17 +15,17 @@ void printHelp()
}
static Expr evalStdin(EvalState & state)
static Expr evalStdin(EvalState & state, bool parseOnly)
{
startNest(nest, lvlTalkative, format("evaluating standard input"));
string s, s2;
while (getline(cin, s2)) s += s2 + "\n";
Expr e = parseExprFromString(state, s, absPath("."));
return evalExpr(state, e);
return parseOnly ? e : evalExpr(state, e);
}
static void printNixExpr(EvalState & state, Expr e)
static void printDrvPaths(EvalState & state, Expr e)
{
ATMatcher m;
ATermList es;
@ -45,14 +45,14 @@ static void printNixExpr(EvalState & state, Expr e)
ATermMap drvMap;
queryAllAttrs(e, drvMap);
for (ATermIterator i(drvMap.keys()); i; ++i)
printNixExpr(state, evalExpr(state, drvMap.get(*i)));
printDrvPaths(state, evalExpr(state, drvMap.get(*i)));
return;
}
}
if (atMatch(m, e) >> "List" >> es) {
for (ATermIterator i(es); i; ++i)
printNixExpr(state, evalExpr(state, *i));
printDrvPaths(state, evalExpr(state, *i));
return;
}
@ -60,11 +60,22 @@ static void printNixExpr(EvalState & state, Expr e)
}
static void printResult(EvalState & state, Expr e, bool evalOnly)
{
if (evalOnly)
cout << format("%1%\n") % e;
else
printDrvPaths(state, e);
}
void run(Strings args)
{
EvalState state;
Strings files;
bool readStdin = false;
bool evalOnly = false;
bool parseOnly = false;
for (Strings::iterator it = args.begin();
it != args.end(); )
@ -73,6 +84,14 @@ void run(Strings args)
if (arg == "-")
readStdin = true;
else if (arg == "--eval-only") {
readOnlyMode = true;
evalOnly = true;
}
else if (arg == "--parse-only") {
readOnlyMode = true;
parseOnly = evalOnly = true;
}
else if (arg[0] == '-')
throw UsageError(format("unknown flag `%1%`") % arg);
else
@ -82,15 +101,16 @@ void run(Strings args)
openDB();
if (readStdin) {
Expr e = evalStdin(state);
printNixExpr(state, e);
Expr e = evalStdin(state, parseOnly);
printResult(state, e, evalOnly);
}
for (Strings::iterator it = files.begin();
it != files.end(); it++)
{
Expr e = evalFile(state, absPath(*it));
printNixExpr(state, e);
/* !!! parseOnly ignored */
printResult(state, e, evalOnly);
}
printEvalStats(state);