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.
106 lines
3.2 KiB
Rust
106 lines
3.2 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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//! This module defines core types that support the transaction processor.
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extern crate edn;
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use std::collections::BTreeMap;
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use std::fmt;
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use self::edn::symbols::NamespacedKeyword;
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/// A tempid, either an external tempid given in a transaction (usually as an `edn::Value::Text`),
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/// or an internal tempid allocated by Mentat itself.
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#[derive(Clone, Debug, Eq, Hash, Ord, PartialOrd, PartialEq)]
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pub enum TempId {
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External(String),
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Internal(i64),
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Tx, // Special identifier used to refer to the current transaction.
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}
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impl TempId {
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pub fn into_external(self) -> Option<String> {
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match self {
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TempId::External(s) => Some(s),
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TempId::Tx |
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TempId::Internal(_) => None,
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}
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}
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}
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impl fmt::Display for TempId {
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fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
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match self {
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&TempId::External(ref s) => write!(f, "{}", s),
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&TempId::Internal(x) => write!(f, "<tempid {}>", x),
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&TempId::Tx => write!(f, "<Tx>"),
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}
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}
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}
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#[derive(Clone, Debug, Eq, Hash, Ord, PartialOrd, PartialEq)]
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pub enum Entid {
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Entid(i64),
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Ident(NamespacedKeyword),
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}
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impl Entid {
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pub fn unreversed(&self) -> Option<Entid> {
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match self {
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&Entid::Entid(_) => None,
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&Entid::Ident(ref a) => a.unreversed().map(Entid::Ident),
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}
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}
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}
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#[derive(Clone, Debug, Eq, Hash, Ord, PartialOrd, PartialEq)]
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pub struct LookupRef {
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pub a: Entid,
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// In theory we could allow nested lookup-refs. In practice this would require us to process
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// lookup-refs in multiple phases, like how we resolve tempids, which isn't worth the effort.
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pub v: edn::Value, // An atom.
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}
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pub type MapNotation = BTreeMap<Entid, AtomOrLookupRefOrVectorOrMapNotation>;
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#[derive(Clone, Debug, Eq, Hash, Ord, PartialOrd, PartialEq)]
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pub enum AtomOrLookupRefOrVectorOrMapNotation {
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Atom(edn::ValueAndSpan),
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LookupRef(LookupRef),
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Vector(Vec<AtomOrLookupRefOrVectorOrMapNotation>),
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MapNotation(MapNotation),
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}
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#[derive(Clone, Debug, Eq, Hash, Ord, PartialOrd, PartialEq)]
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pub enum EntidOrLookupRefOrTempId {
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Entid(Entid),
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LookupRef(LookupRef),
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TempId(TempId),
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}
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#[derive(Clone, Copy, Debug, Eq, Hash, Ord, PartialOrd, PartialEq)]
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pub enum OpType {
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Add,
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Retract,
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}
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#[derive(Clone, Debug, Eq, Hash, Ord, PartialOrd, PartialEq)]
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pub enum Entity {
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// Like [:db/add|:db/retract e a v].
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AddOrRetract {
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op: OpType,
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e: EntidOrLookupRefOrTempId,
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a: Entid,
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v: AtomOrLookupRefOrVectorOrMapNotation,
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},
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// Like {:db/id "tempid" a1 v1 a2 v2}.
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MapNotation(MapNotation),
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}
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