Add builtin function ‘fromJSON’

Fixes #294.

1 files changed, 13 insertions, 0 deletions

diff --git a/src/libexpr/json-to-value.hh b/src/libexpr/json-to-value.hh
new file mode 100644
index 000000000..33f35b16c
--- /dev/null
+++ b/src/libexpr/json-to-value.hh
@@ -0,0 +1,13 @@
+#pragma once
+
+#include "eval.hh"
+
+#include <string>
+
+namespace nix {
+
+MakeError(JSONParseError, EvalError)
+
+void parseJSON(EvalState & state, const string & s, Value & v);
+
+}