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primops: Move functions to primops/json.cc

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Moved builtins: fromJSON, toJSON

Change-Id: I3ae74a42bd036203b24b39fbd6b346f56d3812f3
This commit is contained in:
Tom Hubrecht 2024-05-30 10:12:17 +02:00
parent c3ffa21778
commit a93af3f92f
3 changed files with 66 additions and 51 deletions
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1
src/libexpr/meson.build
View file

@ -98,6 +98,7 @@ libexpr_sources = files(
'primops/fetchTree.cc',
'primops/fromTOML.cc',
'primops/import.cc',
'primops/json.cc',
'primops/list.cc',
'primops/path.cc',
'primops/string.cc',

51
src/libexpr/primops.cc
View file

@ -291,57 +291,6 @@ static RegisterPrimOp primop_toXML({
.fun = prim_toXML,
});
/* 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, const PosIdx pos, Value * * args, Value & v)
{
std::ostringstream out;
NixStringContext context;
printValueAsJSON(state, true, *args[0], pos, out, context);
v.mkString(out.str(), context);
}
static RegisterPrimOp primop_toJSON({
.name = "__toJSON",
.args = {"e"},
.doc = R"(
Return a string containing a JSON representation of *e*. Strings,
integers, floats, booleans, nulls and lists are mapped to their JSON
equivalents. Sets (except derivations) are represented as objects.
Derivations are translated to a JSON string containing the
derivation’s output path. Paths are copied to the store and
represented as a JSON string of the resulting store path.
)",
.fun = prim_toJSON,
});
/* Parse a JSON string to a value. */
static void prim_fromJSON(EvalState & state, const PosIdx pos, Value * * args, Value & v)
{
auto s = state.forceStringNoCtx(*args[0], pos, "while evaluating the first argument passed to builtins.fromJSON");
try {
parseJSON(state, s, v);
} catch (JSONParseError &e) {
e.addTrace(state.positions[pos], "while decoding a JSON string");
throw;
}
}
static RegisterPrimOp primop_fromJSON({
.name = "__fromJSON",
.args = {"e"},
.doc = R"(
Convert a JSON string to a Nix value. For example,
```nix
builtins.fromJSON ''{"x": [1, 2, 3], "y": null}''
```
returns the value `{ x = [ 1 2 3 ]; y = null; }`.
)",
.fun = prim_fromJSON,
});
/* Store a string in the Nix store as a source file that can be used
as an input by derivations. */

65
src/libexpr/primops/json.cc Normal file
View file

@ -0,0 +1,65 @@
#include "json-to-value.hh"
#include "primops.hh"
#include "value-to-json.hh"
namespace nix {
/**
* builtins.fromJSON
*/
static void prim_fromJSON(EvalState & state, const PosIdx pos, Value ** args, Value & v)
{
auto s = state.forceStringNoCtx(
*args[0], pos, "while evaluating the first argument passed to builtins.fromJSON"
);
try {
parseJSON(state, s, v);
} catch (JSONParseError & e) {
e.addTrace(state.positions[pos], "while decoding a JSON string");
throw;
}
}
static RegisterPrimOp primop_fromJSON({
.name = "__fromJSON",
.args = {"e"},
.doc = R"(
Convert a JSON string to a Nix value. For example,
```nix
builtins.fromJSON ''{"x": [1, 2, 3], "y": null}''
```
returns the value `{ x = [ 1 2 3 ]; y = null; }`.
)",
.fun = prim_fromJSON,
});
/**
* builtins.toJSON
*/
static void prim_toJSON(EvalState & state, const PosIdx pos, Value ** args, Value & v)
{
std::ostringstream out;
NixStringContext context;
printValueAsJSON(state, true, *args[0], pos, out, context);
v.mkString(out.str(), context);
}
static RegisterPrimOp primop_toJSON({
.name = "__toJSON",
.args = {"e"},
.doc = R"(
Return a string containing a JSON representation of *e*. Strings,
integers, floats, booleans, nulls and lists are mapped to their JSON
equivalents. Sets (except derivations) are represented as objects.
Derivations are translated to a JSON string containing the
derivation’s output path. Paths are copied to the store and
represented as a JSON string of the resulting store path.
)",
.fun = prim_toJSON,
});
}