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Add a toJSON primop

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This commit is contained in:
Eelco Dolstra 2013-11-19 00:03:11 +01:00
parent 285df765b9
commit 77c13cdf56
10 changed files with 179 additions and 24 deletions
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14
src/libexpr/primops.cc
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@ -5,6 +5,7 @@
#include "util.hh"
#include "archive.hh"
#include "value-to-xml.hh"
#include "value-to-json.hh"
#include "names.hh"
#include "eval-inline.hh"
@ -647,6 +648,18 @@ static void prim_toXML(EvalState & state, Value * * args, Value & v)
}
/* Convert the argument (which can be any Nix expression) to a JSON
string. Not all Nix expressions can be sensibly or completely
represented (e.g., functions). */
static void prim_toJSON(EvalState & state, Value * * args, Value & v)
{
std::ostringstream out;
PathSet context;
printValueAsJSON(state, true, *args[0], out, context);
mkString(v, out.str(), context);
}
/* Store a string in the Nix store as a source file that can be used
as an input by derivations. */
static void prim_toFile(EvalState & state, Value * * args, Value & v)
@ -1259,6 +1272,7 @@ void EvalState::createBaseEnv()
// Creating files
addPrimOp("__toXML", 1, prim_toXML);
addPrimOp("__toJSON", 1, prim_toJSON);
addPrimOp("__toFile", 2, prim_toFile);
addPrimOp("__filterSource", 2, prim_filterSource);