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//! The ReQL data types
use ql2::proto::{Term, Datum,
Term_TermType as TermType,
Datum_DatumType as DatumType,
Datum_AssocPair as DatumPair};
use serde_json::value::{Value, ToJson};
use protobuf::repeated::RepeatedField;
pub trait FromJson {
fn from_json<T: ToJson>(t: T) -> Term {
// Datum
let mut datum = Datum::new();
match t.to_json() {
Ok(val) => {
match val {
Value::String(val) => {
datum.set_field_type(DatumType::R_STR);
datum.set_r_str(val);
}
Value::Bool(val) => {
datum.set_field_type(DatumType::R_BOOL);
datum.set_r_bool(val);
}
Value::Number(val) => {
match val.as_f64() {
Some(val) => {
datum.set_field_type(DatumType::R_NUM);
datum.set_r_num(val);
}
None => {
// @TODO: handle this at compile time
unreachable!();
}
}
}
Value::Array(val) => {
datum.set_field_type(DatumType::R_ARRAY);
let args: Vec<Datum> = val.iter()
.map(|a| Term::from_json(a).take_datum())
.collect();
let arr = RepeatedField::from_vec(args);
datum.set_r_array(arr);
}
Value::Object(val) => {
datum.set_field_type(DatumType::R_OBJECT);
let args: Vec<DatumPair> = val.into_iter()
.map(|(name, arg)| {
let mut obj = DatumPair::new();
obj.set_key(name.into());
obj.set_val(Term::from_json(arg).take_datum());
obj
})
.collect();
let obj = RepeatedField::from_vec(args);
datum.set_r_object(obj);
}
Value::Null => {
datum.set_field_type(DatumType::R_NULL);
}
}
}
Err(_) => {
// @TODO handle this at compile time
unreachable!();
}
}
// Term
let mut term = Term::new();
term.set_field_type(TermType::DATUM);
term.set_datum(datum);
term
}
}
impl FromJson for Term { }