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/// Implementation of Value serialisation *to* JSON.
///
/// This can not be implemented through standard serde-derive methods,
/// as there is internal Nix logic that must happen within the
/// serialisation methods.
use super::{CoercionKind, Value};
use crate::errors::{CatchableErrorKind, ErrorKind};
use crate::generators::{self, GenCo};
use crate::NixContext;
use bstr::ByteSlice;
use serde_json::value::to_value;
use serde_json::Value as Json; // name clash with *our* `Value`
use serde_json::{Map, Number};
impl Value {
/// Transforms the structure into a JSON
/// and accumulate all encountered context in the second's element
/// of the return type.
pub async fn into_contextful_json(
self,
co: &GenCo,
) -> Result<Result<(Json, NixContext), CatchableErrorKind>, ErrorKind> {
let self_forced = generators::request_force(co, self).await;
let mut context = NixContext::new();
let value = match self_forced {
Value::Null => Json::Null,
Value::Bool(b) => Json::Bool(b),
Value::Integer(i) => Json::Number(Number::from(i)),
Value::Float(f) => to_value(f)?,
Value::String(s) => {
context.mimic(&s);
Json::String(s.to_str()?.to_owned())
}
Value::Path(p) => {
let imported = generators::request_path_import(co, *p).await;
let path = imported.to_string_lossy().to_string();
context = context.append(crate::NixContextElement::Plain(path.clone()));
Json::String(path)
}
Value::List(l) => {
let mut out = vec![];
for val in l.into_iter() {
match generators::request_to_json(co, val).await {
Ok((v, ctx)) => {
context.extend(ctx.into_iter());
out.push(v)
}
Err(cek) => return Ok(Err(cek)),
}
}
Json::Array(out)
}
Value::Attrs(attrs) => {
// Attribute sets with a callable `__toString` attribute
// serialise to the string-coerced version of the result of
// calling that.
if attrs.select("__toString").is_some() {
let span = generators::request_span(co).await;
match Value::Attrs(attrs)
.coerce_to_string_(
co,
CoercionKind {
strong: false,
import_paths: false,
},
span,
)
.await?
{
Value::Catchable(cek) => return Ok(Err(*cek)),
Value::String(s) => {
// We need a fresh context here because `__toString` will discard
// everything.
let mut fresh = NixContext::new();
fresh.mimic(&s);
return Ok(Ok((Json::String(s.to_str()?.to_owned()), fresh)));
}
_ => panic!("Value::coerce_to_string_() returned a non-string!"),
}
}
// Attribute sets with an `outPath` attribute
// serialise to a JSON serialisation of that inner
// value (regardless of what it is!).
if let Some(out_path) = attrs.select("outPath") {
return Ok(generators::request_to_json(co, out_path.clone()).await);
}
let mut out = Map::with_capacity(attrs.len());
for (name, value) in attrs.into_iter_sorted() {
out.insert(
name.to_str()?.to_owned(),
match generators::request_to_json(co, value).await {
Ok((v, ctx)) => {
context.extend(ctx.into_iter());
v
}
Err(cek) => return Ok(Err(cek)),
},
);
}
Json::Object(out)
}
Value::Catchable(c) => return Ok(Err(*c)),
val @ Value::Closure(_)
| val @ Value::Thunk(_)
| val @ Value::Builtin(_)
| val @ Value::AttrNotFound
| val @ Value::Blueprint(_)
| val @ Value::DeferredUpvalue(_)
| val @ Value::UnresolvedPath(_)
| val @ Value::Json(..)
| val @ Value::FinaliseRequest(_) => {
return Err(ErrorKind::NotSerialisableToJson(val.type_of()))
}
};
Ok(Ok((value, context)))
}
/// Generator version of the above, which wraps responses in
/// [`Value::Json`].
pub(crate) async fn into_contextful_json_generator(
self,
co: GenCo,
) -> Result<Value, ErrorKind> {
match self.into_contextful_json(&co).await? {
Err(cek) => Ok(Value::from(cek)),
Ok((json, ctx)) => Ok(Value::Json(Box::new((json, ctx)))),
}
}
/// Transforms the structure into a JSON
/// All the accumulated context is ignored, use [`into_contextful_json`]
/// to obtain the resulting context of the JSON object.
pub async fn into_json(
self,
co: &GenCo,
) -> Result<Result<Json, CatchableErrorKind>, ErrorKind> {
Ok(self.into_contextful_json(co).await?.map(|(json, _)| json))
}
}
|
