1817ce7c0b
* Use fixed-size arrays for bootstrap datoms, not vecs.
* Wide-ranging cleanup.
This commit:
- Deletes some dead code.
- Marks some functions only used by tests as cfg(test).
- Adds pub(crate) to a bunch of functions.
- Cleans up a few other nits.
99 lines
3.8 KiB
Rust
99 lines
3.8 KiB
Rust
// Copyright 2016 Mozilla
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//
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not use
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// this file except in compliance with the License. You may obtain a copy of the
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// License at http://www.apache.org/licenses/LICENSE-2.0
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// Unless required by applicable law or agreed to in writing, software distributed
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// under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
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// CONDITIONS OF ANY KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations under the License.
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#![allow(dead_code)]
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//! Types used only within the transactor. These should not be exposed outside of this crate.
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use std::collections::HashMap;
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use std::rc::Rc;
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use mentat_core::KnownEntid;
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use mentat_core::util::Either;
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use errors;
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use errors::ErrorKind;
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use types::{
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AVMap,
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AVPair,
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Entid,
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TypedValue,
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};
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use mentat_tx::entities::{
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OpType,
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TempId,
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};
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#[derive(Clone, Debug, Eq, Hash, Ord, PartialOrd, PartialEq)]
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pub enum Term<E, V> {
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AddOrRetract(OpType, E, Entid, V),
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}
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use self::Either::*;
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pub type KnownEntidOr<T> = Either<KnownEntid, T>;
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pub type TypedValueOr<T> = Either<TypedValue, T>;
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pub type TempIdHandle = Rc<TempId>;
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pub type TempIdMap = HashMap<TempIdHandle, KnownEntid>;
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pub type LookupRef = Rc<AVPair>;
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/// Internal representation of an entid on its way to resolution. We either have the simple case (a
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/// numeric entid), a lookup-ref that still needs to be resolved (an atomized [a v] pair), or a temp
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/// ID that needs to be upserted or allocated (an atomized tempid).
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#[derive(Clone,Debug,Eq,Hash,Ord,PartialOrd,PartialEq)]
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pub enum LookupRefOrTempId {
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LookupRef(LookupRef),
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TempId(TempIdHandle)
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}
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pub type TermWithTempIdsAndLookupRefs = Term<KnownEntidOr<LookupRefOrTempId>, TypedValueOr<LookupRefOrTempId>>;
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pub type TermWithTempIds = Term<KnownEntidOr<TempIdHandle>, TypedValueOr<TempIdHandle>>;
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pub type TermWithoutTempIds = Term<KnownEntid, TypedValue>;
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pub type Population = Vec<TermWithTempIds>;
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impl TermWithTempIds {
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// These have no tempids by definition, and just need to be unwrapped. This operation might
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// also be called "lowering" or "level lowering", but the concept of "unwrapping" is common in
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// Rust and seems appropriate here.
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pub(crate) fn unwrap(self) -> TermWithoutTempIds {
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match self {
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Term::AddOrRetract(op, Left(n), a, Left(v)) => Term::AddOrRetract(op, n, a, v),
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_ => unreachable!(),
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}
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}
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}
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/// Given a `KnownEntidOr` or a `TypedValueOr`, replace any internal `LookupRef` with the entid from
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/// the given map. Fail if any `LookupRef` cannot be replaced.
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///
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/// `lift` allows to specify how the entid found is mapped into the output type. (This could
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/// also be an `Into` or `From` requirement.)
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///
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/// The reason for this awkward expression is that we're parameterizing over the _type constructor_
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/// (`EntidOr` or `TypedValueOr`), which is not trivial to express in Rust. This only works because
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/// they're both the same `Result<...>` type with different parameterizations.
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pub fn replace_lookup_ref<T, U>(lookup_map: &AVMap, desired_or: Either<T, LookupRefOrTempId>, lift: U) -> errors::Result<Either<T, TempIdHandle>> where U: FnOnce(Entid) -> T {
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match desired_or {
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Left(desired) => Ok(Left(desired)), // N.b., must unwrap here -- the ::Left types are different!
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Right(other) => {
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match other {
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LookupRefOrTempId::TempId(t) => Ok(Right(t)),
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LookupRefOrTempId::LookupRef(av) => lookup_map.get(&*av)
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.map(|x| lift(*x)).map(Left)
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// XXX TODO: fix this error kind!
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.ok_or_else(|| ErrorKind::UnrecognizedIdent(format!("couldn't lookup [a v]: {:?}", (*av).clone())).into()),
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}
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}
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}
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}
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