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mod.rs
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mod.rs
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//! Prisma Response IR (Intermediate Representation).
//!
//! This module takes care of processing query execution results
//! and transforming them into a different AST.
//!
//! This IR is meant for general processing and storage.
//! It can also be easily serialized.
//!
//! Note: The code itself can be considered WIP. It is clear when reading the code that there are missing abstractions
//! and a restructure might be necessary (good example is the default value handling sprinkled all over the place).
mod internal;
mod ir_serializer;
mod response;
use crate::QueryValue;
use indexmap::IndexMap;
use prisma_models::PrismaValue;
use serde::ser::{Serialize, SerializeMap, SerializeSeq, Serializer};
use std::{collections::HashMap, fmt, sync::Arc};
pub use ir_serializer::*;
pub use response::*;
/// A `key -> value` map to an IR item
pub type Map = IndexMap<String, Item>;
#[derive(Clone, PartialEq)]
pub struct List {
inner: Vec<Item>,
}
impl fmt::Debug for List {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
self.inner.fmt(f)
}
}
impl List {
pub fn len(&self) -> usize {
self.inner.len()
}
pub fn is_empty(&self) -> bool {
self.len() == 0
}
pub fn index_by(self, keys: &[String]) -> Vec<(HashMap<String, QueryValue>, Map)> {
let mut map: Vec<(HashMap<String, QueryValue>, Map)> = Vec::with_capacity(self.len());
for item in self.into_iter() {
let inner = item.into_map().unwrap();
let key: HashMap<String, QueryValue> = keys
.iter()
.map(|key| (key.clone(), inner.get(key).unwrap().clone().into_value().unwrap()))
.map(|(key, val)| (key, QueryValue::from(val)))
.collect();
map.push((key, inner));
}
map
}
}
impl From<Vec<Item>> for List {
fn from(inner: Vec<Item>) -> Self {
Self { inner }
}
}
impl IntoIterator for List {
type Item = Item;
type IntoIter = std::vec::IntoIter<Self::Item>;
fn into_iter(self) -> Self::IntoIter {
self.inner.into_iter()
}
}
impl<'a> IntoIterator for &'a List {
type Item = &'a Item;
type IntoIter = std::slice::Iter<'a, Item>;
fn into_iter(self) -> Self::IntoIter {
self.inner.iter()
}
}
/// Convenience type wrapper for Arc<Item>.
pub type ItemRef = Arc<Item>;
/// An IR item that either expands to a subtype or leaf-record.
#[derive(Debug, Clone, PartialEq)]
pub enum Item {
Map(Map),
List(List),
Value(PrismaValue),
Json(serde_json::Value),
/// Wrapper type to allow multiple parent records
/// to claim the same item without copying data
/// (serialization can then choose how to copy if necessary).
Ref(ItemRef),
}
impl Item {
pub fn null() -> Self {
Self::Value(PrismaValue::Null)
}
pub fn list(inner: Vec<Item>) -> Self {
Self::List(List::from(inner))
}
pub fn as_map(&self) -> Option<&Map> {
match self {
Self::Map(m) => Some(m),
Self::Ref(r) => r.as_map(),
_ => None,
}
}
pub fn into_map(self) -> Option<Map> {
match self {
Self::Map(m) => Some(m),
Self::Ref(r) => Arc::try_unwrap(r).ok().and_then(|r| r.into_map()),
_ => None,
}
}
pub fn into_value(self) -> Option<PrismaValue> {
match self {
Self::Value(pv) => Some(pv),
Self::Ref(r) => Arc::try_unwrap(r).ok().and_then(|r| r.into_value()),
Self::List(list) => {
let mut values = vec![];
for item in list {
if let Some(pv) = item.into_value() {
values.push(pv)
} else {
return None;
}
}
Some(PrismaValue::List(values))
}
_ => None,
}
}
pub fn into_list(self) -> Option<List> {
match self {
Self::List(l) => Some(l),
Self::Ref(r) => Arc::try_unwrap(r).ok().and_then(|r| r.into_list()),
_ => None,
}
}
}
impl Serialize for Item {
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where
S: Serializer,
{
match self {
Self::Map(m) => {
let mut map = serializer.serialize_map(Some(m.len()))?;
for (k, v) in m {
map.serialize_entry(k, v)?;
}
map.end()
}
Self::List(l) => {
let mut seq = serializer.serialize_seq(Some(l.len()))?;
for e in l {
seq.serialize_element(e)?;
}
seq.end()
}
Self::Value(pv) => pv.serialize(serializer),
Self::Json(value) => value.serialize(serializer),
Self::Ref(item_ref) => item_ref.serialize(serializer),
}
}
}