tvl-depot/src/libexpr/common-opts.cc
Eelco Dolstra ac1e8f40d4 * Use a symbol table to represent identifiers and attribute names
efficiently.  The symbol table ensures that there is only one copy
  of each symbol, thus allowing symbols to be compared efficiently
  using a pointer equality test.
2010-04-13 12:25:42 +00:00

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C++

#include "common-opts.hh"
#include "../libmain/shared.hh"
#include "util.hh"
#include "parser.hh"
namespace nix {
bool parseOptionArg(const string & arg, Strings::iterator & i,
const Strings::iterator & argsEnd, EvalState & state,
Bindings & autoArgs)
{
if (arg != "--arg" && arg != "--argstr") return false;
UsageError error(format("`%1%' requires two arguments") % arg);
if (i == argsEnd) throw error;
string name = *i++;
if (i == argsEnd) throw error;
string value = *i++;
Value & v(autoArgs[state.symbols.create(name)]);
if (arg == "--arg")
state.mkThunk_( v, parseExprFromString(state, value, absPath(".")));
else
mkString(v, value);
return true;
}
}