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Split mentat_core TypedValue code into separate files for clarity.

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This commit is contained in:
Richard Newman 2018-04-16 12:54:36 -07:00
parent a74a2deffc
commit 1818e0b98e
4 changed files with 739 additions and 653 deletions
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675
core/src/lib.rs
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@ -27,16 +27,8 @@ mod cache;
use std::collections::{
BTreeMap,
BTreeSet,
};
use std::fmt;
use std::rc::Rc;
use enum_set::EnumSet;
use self::ordered_float::OrderedFloat;
pub use uuid::Uuid;
pub use chrono::{
@ -57,651 +49,28 @@ pub use cache::{
};
/// Core types defining a Mentat knowledge base.
/// Represents one entid in the entid space.
///
/// Per https://www.sqlite.org/datatype3.html (see also http://stackoverflow.com/a/8499544), SQLite
/// stores signed integers up to 64 bits in size. Since u32 is not appropriate for our use case, we
/// use i64 rather than manually truncating u64 to u63 and casting to i64 throughout the codebase.
pub type Entid = i64;
/// An entid that's either already in the store, or newly allocated to a tempid.
/// TODO: we'd like to link this in some way to the lifetime of a particular PartitionMap.
#[derive(Clone, Copy, Debug, Hash, Eq, PartialEq, Ord, PartialOrd)]
pub struct KnownEntid(pub Entid);
impl From<KnownEntid> for Entid {
fn from(k: KnownEntid) -> Entid {
k.0
}
}
impl From<KnownEntid> for TypedValue {
fn from(k: KnownEntid) -> TypedValue {
TypedValue::Ref(k.0)
}
}
/// The attribute of each Mentat assertion has a :db/valueType constraining the value to a
/// particular set. Mentat recognizes the following :db/valueType values.
#[derive(Clone, Copy, Debug, Eq, Hash, Ord, PartialOrd, PartialEq)]
#[repr(u32)]
pub enum ValueType {
Ref,
Boolean,
Instant,
Long,
Double,
String,
Keyword,
Uuid,
}
pub type ValueTypeTag = i32;
impl ValueType {
pub fn all_enums() -> EnumSet<ValueType> {
// TODO: lazy_static.
let mut s = EnumSet::new();
s.insert(ValueType::Ref);
s.insert(ValueType::Boolean);
s.insert(ValueType::Instant);
s.insert(ValueType::Long);
s.insert(ValueType::Double);
s.insert(ValueType::String);
s.insert(ValueType::Keyword);
s.insert(ValueType::Uuid);
s
}
}
impl enum_set::CLike for ValueType {
fn to_u32(&self) -> u32 {
*self as u32
}
unsafe fn from_u32(v: u32) -> ValueType {
std::mem::transmute(v)
}
}
impl ValueType {
pub fn into_keyword(self) -> NamespacedKeyword {
NamespacedKeyword::new("db.type", match self {
ValueType::Ref => "ref",
ValueType::Boolean => "boolean",
ValueType::Instant => "instant",
ValueType::Long => "long",
ValueType::Double => "double",
ValueType::String => "string",
ValueType::Keyword => "keyword",
ValueType::Uuid => "uuid",
})
}
pub fn into_typed_value(self) -> TypedValue {
TypedValue::typed_ns_keyword("db.type", match self {
ValueType::Ref => "ref",
ValueType::Boolean => "boolean",
ValueType::Instant => "instant",
ValueType::Long => "long",
ValueType::Double => "double",
ValueType::String => "string",
ValueType::Keyword => "keyword",
ValueType::Uuid => "uuid",
})
}
pub fn into_edn_value(self) -> edn::Value {
match self {
ValueType::Ref => values::DB_TYPE_REF.clone(),
ValueType::Boolean => values::DB_TYPE_BOOLEAN.clone(),
ValueType::Instant => values::DB_TYPE_INSTANT.clone(),
ValueType::Long => values::DB_TYPE_LONG.clone(),
ValueType::Double => values::DB_TYPE_DOUBLE.clone(),
ValueType::String => values::DB_TYPE_STRING.clone(),
ValueType::Keyword => values::DB_TYPE_KEYWORD.clone(),
ValueType::Uuid => values::DB_TYPE_UUID.clone(),
}
}
}
impl fmt::Display for ValueType {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{}", match *self {
ValueType::Ref => ":db.type/ref",
ValueType::Boolean => ":db.type/boolean",
ValueType::Instant => ":db.type/instant",
ValueType::Long => ":db.type/long",
ValueType::Double => ":db.type/double",
ValueType::String => ":db.type/string",
ValueType::Keyword => ":db.type/keyword",
ValueType::Uuid => ":db.type/uuid",
})
}
}
/// Represents a Mentat value in a particular value set.
// TODO: expand to include :db.type/uri. https://github.com/mozilla/mentat/issues/201
// TODO: JSON data type? https://github.com/mozilla/mentat/issues/31
// TODO: BigInt? Bytes?
#[derive(Clone,Debug,Eq,Hash,Ord,PartialOrd,PartialEq,Serialize,Deserialize)]
pub enum TypedValue {
Ref(Entid),
Boolean(bool),
Long(i64),
Double(OrderedFloat<f64>),
Instant(DateTime<Utc>), // Use `into()` to ensure truncation.
// TODO: &str throughout?
String(Rc<String>),
Keyword(Rc<NamespacedKeyword>),
Uuid(Uuid), // It's only 128 bits, so this should be acceptable to clone.
}
impl TypedValue {
/// Returns true if the provided type is `Some` and matches this value's type, or if the
/// provided type is `None`.
#[inline]
pub fn is_congruent_with<T: Into<Option<ValueType>>>(&self, t: T) -> bool {
t.into().map_or(true, |x| self.matches_type(x))
}
#[inline]
pub fn matches_type(&self, t: ValueType) -> bool {
self.value_type() == t
}
pub fn value_type(&self) -> ValueType {
match self {
&TypedValue::Ref(_) => ValueType::Ref,
&TypedValue::Boolean(_) => ValueType::Boolean,
&TypedValue::Long(_) => ValueType::Long,
&TypedValue::Instant(_) => ValueType::Instant,
&TypedValue::Double(_) => ValueType::Double,
&TypedValue::String(_) => ValueType::String,
&TypedValue::Keyword(_) => ValueType::Keyword,
&TypedValue::Uuid(_) => ValueType::Uuid,
}
}
/// Construct a new `TypedValue::Keyword` instance by cloning the provided
/// values and wrapping them in a new `Rc`. This is expensive, so this might
/// be best limited to tests.
pub fn typed_ns_keyword(ns: &str, name: &str) -> TypedValue {
TypedValue::Keyword(Rc::new(NamespacedKeyword::new(ns, name)))
}
/// Construct a new `TypedValue::String` instance by cloning the provided
/// value and wrapping it in a new `Rc`. This is expensive, so this might
/// be best limited to tests.
pub fn typed_string(s: &str) -> TypedValue {
TypedValue::String(Rc::new(s.to_string()))
}
pub fn current_instant() -> TypedValue {
Utc::now().into()
}
/// Construct a new `TypedValue::Instant` instance from the provided
/// microsecond timestamp.
pub fn instant(micros: i64) -> TypedValue {
DateTime::<Utc>::from_micros(micros).into()
}
}
trait MicrosecondPrecision {
/// Truncate the provided `DateTime` to microsecond precision.
fn microsecond_precision(self) -> Self;
}
impl MicrosecondPrecision for DateTime<Utc> {
fn microsecond_precision(self) -> DateTime<Utc> {
let nanoseconds = self.nanosecond();
if nanoseconds % 1000 == 0 {
return self;
}
let microseconds = nanoseconds / 1000;
let truncated = microseconds * 1000;
self.with_nanosecond(truncated).expect("valid timestamp")
}
}
/// Return the current time as a UTC `DateTime` instance with microsecond precision.
pub fn now() -> DateTime<Utc> {
Utc::now().microsecond_precision()
}
// We don't do From<i64> or From<Entid> 'cos it's ambiguous.
impl From<bool> for TypedValue {
fn from(value: bool) -> TypedValue {
TypedValue::Boolean(value)
}
}
/// Truncate the provided `DateTime` to microsecond precision, and return the corresponding
/// `TypedValue::Instant`.
impl From<DateTime<Utc>> for TypedValue {
fn from(value: DateTime<Utc>) -> TypedValue {
TypedValue::Instant(value.microsecond_precision())
}
}
impl From<Uuid> for TypedValue {
fn from(value: Uuid) -> TypedValue {
TypedValue::Uuid(value)
}
}
impl<'a> From<&'a str> for TypedValue {
fn from(value: &'a str) -> TypedValue {
TypedValue::String(Rc::new(value.to_string()))
}
}
impl From<String> for TypedValue {
fn from(value: String) -> TypedValue {
TypedValue::String(Rc::new(value))
}
}
impl From<NamespacedKeyword> for TypedValue {
fn from(value: NamespacedKeyword) -> TypedValue {
TypedValue::Keyword(Rc::new(value))
}
}
impl From<u32> for TypedValue {
fn from(value: u32) -> TypedValue {
TypedValue::Long(value as i64)
}
}
impl From<i32> for TypedValue {
fn from(value: i32) -> TypedValue {
TypedValue::Long(value as i64)
}
}
impl From<f64> for TypedValue {
fn from(value: f64) -> TypedValue {
TypedValue::Double(OrderedFloat(value))
}
}
impl TypedValue {
pub fn into_known_entid(self) -> Option<KnownEntid> {
match self {
TypedValue::Ref(v) => Some(KnownEntid(v)),
_ => None,
}
}
pub fn into_entid(self) -> Option<Entid> {
match self {
TypedValue::Ref(v) => Some(v),
_ => None,
}
}
pub fn into_kw(self) -> Option<Rc<NamespacedKeyword>> {
match self {
TypedValue::Keyword(v) => Some(v),
_ => None,
}
}
pub fn into_boolean(self) -> Option<bool> {
match self {
TypedValue::Boolean(v) => Some(v),
_ => None,
}
}
pub fn into_long(self) -> Option<i64> {
match self {
TypedValue::Long(v) => Some(v),
_ => None,
}
}
pub fn into_double(self) -> Option<f64> {
match self {
TypedValue::Double(v) => Some(v.into_inner()),
_ => None,
}
}
pub fn into_instant(self) -> Option<DateTime<Utc>> {
match self {
TypedValue::Instant(v) => Some(v),
_ => None,
}
}
pub fn into_timestamp(self) -> Option<i64> {
match self {
TypedValue::Instant(v) => Some(v.timestamp()),
_ => None,
}
}
pub fn into_string(self) -> Option<Rc<String>> {
match self {
TypedValue::String(v) => Some(v),
_ => None,
}
}
pub fn into_uuid(self) -> Option<Uuid> {
match self {
TypedValue::Uuid(v) => Some(v),
_ => None,
}
}
pub fn into_uuid_string(self) -> Option<String> {
match self {
TypedValue::Uuid(v) => Some(v.hyphenated().to_string()),
_ => None,
}
}
}
/// Type safe representation of the possible return values from SQLite's `typeof`
#[derive(Clone, Copy, Debug, Eq, Hash, Ord, PartialOrd, PartialEq)]
pub enum SQLTypeAffinity {
Null, // "null"
Integer, // "integer"
Real, // "real"
Text, // "text"
Blob, // "blob"
}
// Put this here rather than in `db` simply because it's widely needed.
pub trait SQLValueType {
fn value_type_tag(&self) -> ValueTypeTag;
fn accommodates_integer(&self, int: i64) -> bool;
/// Return a pair of the ValueTypeTag for this value type, and the SQLTypeAffinity required
/// to distinguish it from any other types that share the same tag.
///
/// Background: The tag alone is not enough to determine the type of a value, since multiple
/// ValueTypes may share the same tag (for example, ValueType::Long and ValueType::Double).
/// However, each ValueType can be determined by checking both the tag and the type's affinity.
fn sql_representation(&self) -> (ValueTypeTag, Option<SQLTypeAffinity>);
}
impl SQLValueType for ValueType {
fn sql_representation(&self) -> (ValueTypeTag, Option<SQLTypeAffinity>) {
match *self {
ValueType::Ref => (0, None),
ValueType::Boolean => (1, None),
ValueType::Instant => (4, None),
// SQLite distinguishes integral from decimal types, allowing long and double to share a tag.
ValueType::Long => (5, Some(SQLTypeAffinity::Integer)),
ValueType::Double => (5, Some(SQLTypeAffinity::Real)),
ValueType::String => (10, None),
ValueType::Uuid => (11, None),
ValueType::Keyword => (13, None),
}
}
#[inline]
fn value_type_tag(&self) -> ValueTypeTag {
self.sql_representation().0
}
/// Returns true if the provided integer is in the SQLite value space of this type. For
/// example, `1` is how we encode `true`.
///
/// ```
/// use mentat_core::{ValueType, SQLValueType};
/// assert!(!ValueType::Instant.accommodates_integer(1493399581314));
/// assert!(!ValueType::Instant.accommodates_integer(1493399581314000));
/// assert!(ValueType::Boolean.accommodates_integer(1));
/// assert!(!ValueType::Boolean.accommodates_integer(-1));
/// assert!(!ValueType::Boolean.accommodates_integer(10));
/// assert!(!ValueType::String.accommodates_integer(10));
/// ```
fn accommodates_integer(&self, int: i64) -> bool {
use ValueType::*;
match *self {
Instant => false, // Always use #inst.
Long | Double => true,
Ref => int >= 0,
Boolean => (int == 0) || (int == 1),
ValueType::String => false,
Keyword => false,
Uuid => false,
}
}
}
trait EnumSetExtensions<T: enum_set::CLike + Clone> {
/// Return a set containing both `x` and `y`.
fn of_both(x: T, y: T) -> EnumSet<T>;
/// Return a clone of `self` with `y` added.
fn with(&self, y: T) -> EnumSet<T>;
}
impl<T: enum_set::CLike + Clone> EnumSetExtensions<T> for EnumSet<T> {
/// Return a set containing both `x` and `y`.
fn of_both(x: T, y: T) -> Self {
let mut o = EnumSet::new();
o.insert(x);
o.insert(y);
o
}
/// Return a clone of `self` with `y` added.
fn with(&self, y: T) -> EnumSet<T> {
let mut o = self.clone();
o.insert(y);
o
}
}
#[derive(Clone, Copy, Debug, Eq, PartialEq)]
pub struct ValueTypeSet(pub EnumSet<ValueType>);
impl Default for ValueTypeSet {
fn default() -> ValueTypeSet {
ValueTypeSet::any()
}
}
impl ValueTypeSet {
pub fn any() -> ValueTypeSet {
ValueTypeSet(ValueType::all_enums())
}
pub fn none() -> ValueTypeSet {
ValueTypeSet(EnumSet::new())
}
/// Return a set containing only `t`.
pub fn of_one(t: ValueType) -> ValueTypeSet {
let mut s = EnumSet::new();
s.insert(t);
ValueTypeSet(s)
}
/// Return a set containing `Double` and `Long`.
pub fn of_numeric_types() -> ValueTypeSet {
ValueTypeSet(EnumSet::of_both(ValueType::Double, ValueType::Long))
}
/// Return a set containing `Double`, `Long`, and `Instant`.
pub fn of_numeric_and_instant_types() -> ValueTypeSet {
let mut s = EnumSet::new();
s.insert(ValueType::Double);
s.insert(ValueType::Long);
s.insert(ValueType::Instant);
ValueTypeSet(s)
}
/// Return a set containing `Ref` and `Keyword`.
pub fn of_keywords() -> ValueTypeSet {
ValueTypeSet(EnumSet::of_both(ValueType::Ref, ValueType::Keyword))
}
/// Return a set containing `Ref` and `Long`.
pub fn of_longs() -> ValueTypeSet {
ValueTypeSet(EnumSet::of_both(ValueType::Ref, ValueType::Long))
}
}
impl ValueTypeSet {
pub fn insert(&mut self, vt: ValueType) -> bool {
self.0.insert(vt)
}
pub fn len(&self) -> usize {
self.0.len()
}
/// Returns a set containing all the types in this set and `other`.
pub fn union(&self, other: &ValueTypeSet) -> ValueTypeSet {
ValueTypeSet(self.0.union(other.0))
}
pub fn intersection(&self, other: &ValueTypeSet) -> ValueTypeSet {
ValueTypeSet(self.0.intersection(other.0))
}
/// Returns the set difference between `self` and `other`, which is the
/// set of items in `self` that are not in `other`.
pub fn difference(&self, other: &ValueTypeSet) -> ValueTypeSet {
ValueTypeSet(self.0 - other.0)
}
/// Return an arbitrary type that's part of this set.
/// For a set containing a single type, this will be that type.
pub fn exemplar(&self) -> Option<ValueType> {
self.0.iter().next()
}
pub fn is_subset(&self, other: &ValueTypeSet) -> bool {
self.0.is_subset(&other.0)
}
/// Returns true if `self` and `other` contain no items in common.
pub fn is_disjoint(&self, other: &ValueTypeSet) -> bool {
self.0.is_disjoint(&other.0)
}
pub fn contains(&self, vt: ValueType) -> bool {
self.0.contains(&vt)
}
pub fn is_empty(&self) -> bool {
self.0.is_empty()
}
pub fn is_unit(&self) -> bool {
self.0.len() == 1
}
pub fn iter(&self) -> ::enum_set::Iter<ValueType> {
self.0.iter()
}
}
impl From<ValueType> for ValueTypeSet {
fn from(t: ValueType) -> Self {
ValueTypeSet::of_one(t)
}
}
impl ValueTypeSet {
pub fn is_only_numeric(&self) -> bool {
self.is_subset(&ValueTypeSet::of_numeric_types())
}
}
impl IntoIterator for ValueTypeSet {
type Item = ValueType;
type IntoIter = ::enum_set::Iter<ValueType>;
fn into_iter(self) -> Self::IntoIter {
self.0.into_iter()
}
}
impl ::std::iter::FromIterator<ValueType> for ValueTypeSet {
fn from_iter<I: IntoIterator<Item = ValueType>>(iterator: I) -> Self {
let mut ret = Self::none();
ret.0.extend(iterator);
ret
}
}
impl ::std::iter::Extend<ValueType> for ValueTypeSet {
fn extend<I: IntoIterator<Item = ValueType>>(&mut self, iter: I) {
for element in iter {
self.0.insert(element);
}
}
}
/// We have an enum of types, `ValueType`. It can be collected into a set, `ValueTypeSet`. Each type
/// is associated with a type tag, which is how a type is represented in, e.g., SQL storage. Types
/// can share type tags, because backing SQL storage is able to differentiate between some types
/// (e.g., longs and doubles), and so distinct tags aren't necessary. That association is defined by
/// `SQLValueType`. That trait similarly extends to `ValueTypeSet`, which maps a collection of types
/// into a collection of tags.
pub trait SQLValueTypeSet {
fn value_type_tags(&self) -> BTreeSet<ValueTypeTag>;
fn has_unique_type_tag(&self) -> bool;
fn unique_type_tag(&self) -> Option<ValueTypeTag>;
}
impl SQLValueTypeSet for ValueTypeSet {
// This is inefficient, but it'll do for now.
fn value_type_tags(&self) -> BTreeSet<ValueTypeTag> {
let mut out = BTreeSet::new();
for t in self.0.iter() {
out.insert(t.value_type_tag());
}
out
}
fn unique_type_tag(&self) -> Option<ValueTypeTag> {
if self.is_unit() || self.has_unique_type_tag() {
self.exemplar().map(|t| t.value_type_tag())
} else {
None
}
}
fn has_unique_type_tag(&self) -> bool {
if self.is_unit() {
return true;
}
let mut acc = BTreeSet::new();
for t in self.0.iter() {
if acc.insert(t.value_type_tag()) && acc.len() > 1 {
// We inserted a second or subsequent value.
return false;
}
}
!acc.is_empty()
}
}
#[test]
fn test_typed_value() {
assert!(TypedValue::Boolean(false).is_congruent_with(None));
assert!(TypedValue::Boolean(false).is_congruent_with(ValueType::Boolean));
assert!(!TypedValue::typed_string("foo").is_congruent_with(ValueType::Boolean));
assert!(TypedValue::typed_string("foo").is_congruent_with(ValueType::String));
assert!(TypedValue::typed_string("foo").is_congruent_with(None));
}
mod types;
mod value_type_set;
mod sql_types;
pub use types::{
Entid,
KnownEntid,
TypedValue,
ValueType,
ValueTypeTag,
now,
};
pub use value_type_set::{
ValueTypeSet,
};
pub use sql_types::{
SQLTypeAffinity,
SQLValueType,
SQLValueTypeSet,
};
/// Bit flags used in `flags0` column in temporary tables created during search,
/// such as the `search_results`, `inexact_searches` and `exact_searches` tables.

139
core/src/sql_types.rs Normal file
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@ -0,0 +1,139 @@
// Copyright 2018 Mozilla
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not use
// this file except in compliance with the License. You may obtain a copy of the
// License at http://www.apache.org/licenses/LICENSE-2.0
// Unless required by applicable law or agreed to in writing, software distributed
// under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
// CONDITIONS OF ANY KIND, either express or implied. See the License for the
// specific language governing permissions and limitations under the License.
use std::collections::{
BTreeSet,
};
use types::{
ValueType,
ValueTypeTag,
};
use value_type_set::{
ValueTypeSet,
};
/// Type safe representation of the possible return values from SQLite's `typeof`
#[derive(Clone, Copy, Debug, Eq, Hash, Ord, PartialOrd, PartialEq)]
pub enum SQLTypeAffinity {
Null, // "null"
Integer, // "integer"
Real, // "real"
Text, // "text"
Blob, // "blob"
}
// Put this here rather than in `db` simply because it's widely needed.
pub trait SQLValueType {
fn value_type_tag(&self) -> ValueTypeTag;
fn accommodates_integer(&self, int: i64) -> bool;
/// Return a pair of the ValueTypeTag for this value type, and the SQLTypeAffinity required
/// to distinguish it from any other types that share the same tag.
///
/// Background: The tag alone is not enough to determine the type of a value, since multiple
/// ValueTypes may share the same tag (for example, ValueType::Long and ValueType::Double).
/// However, each ValueType can be determined by checking both the tag and the type's affinity.
fn sql_representation(&self) -> (ValueTypeTag, Option<SQLTypeAffinity>);
}
impl SQLValueType for ValueType {
fn sql_representation(&self) -> (ValueTypeTag, Option<SQLTypeAffinity>) {
match *self {
ValueType::Ref => (0, None),
ValueType::Boolean => (1, None),
ValueType::Instant => (4, None),
// SQLite distinguishes integral from decimal types, allowing long and double to share a tag.
ValueType::Long => (5, Some(SQLTypeAffinity::Integer)),
ValueType::Double => (5, Some(SQLTypeAffinity::Real)),
ValueType::String => (10, None),
ValueType::Uuid => (11, None),
ValueType::Keyword => (13, None),
}
}
#[inline]
fn value_type_tag(&self) -> ValueTypeTag {
self.sql_representation().0
}
/// Returns true if the provided integer is in the SQLite value space of this type. For
/// example, `1` is how we encode `true`.
///
/// ```
/// use mentat_core::{ValueType, SQLValueType};
/// assert!(!ValueType::Instant.accommodates_integer(1493399581314));
/// assert!(!ValueType::Instant.accommodates_integer(1493399581314000));
/// assert!(ValueType::Boolean.accommodates_integer(1));
/// assert!(!ValueType::Boolean.accommodates_integer(-1));
/// assert!(!ValueType::Boolean.accommodates_integer(10));
/// assert!(!ValueType::String.accommodates_integer(10));
/// ```
fn accommodates_integer(&self, int: i64) -> bool {
use ValueType::*;
match *self {
Instant => false, // Always use #inst.
Long | Double => true,
Ref => int >= 0,
Boolean => (int == 0) || (int == 1),
ValueType::String => false,
Keyword => false,
Uuid => false,
}
}
}
/// We have an enum of types, `ValueType`. It can be collected into a set, `ValueTypeSet`. Each type
/// is associated with a type tag, which is how a type is represented in, e.g., SQL storage. Types
/// can share type tags, because backing SQL storage is able to differentiate between some types
/// (e.g., longs and doubles), and so distinct tags aren't necessary. That association is defined by
/// `SQLValueType`. That trait similarly extends to `ValueTypeSet`, which maps a collection of types
/// into a collection of tags.
pub trait SQLValueTypeSet {
fn value_type_tags(&self) -> BTreeSet<ValueTypeTag>;
fn has_unique_type_tag(&self) -> bool;
fn unique_type_tag(&self) -> Option<ValueTypeTag>;
}
impl SQLValueTypeSet for ValueTypeSet {
// This is inefficient, but it'll do for now.
fn value_type_tags(&self) -> BTreeSet<ValueTypeTag> {
let mut out = BTreeSet::new();
for t in self.0.iter() {
out.insert(t.value_type_tag());
}
out
}
fn unique_type_tag(&self) -> Option<ValueTypeTag> {
if self.is_unit() || self.has_unique_type_tag() {
self.exemplar().map(|t| t.value_type_tag())
} else {
None
}
}
fn has_unique_type_tag(&self) -> bool {
if self.is_unit() {
return true;
}
let mut acc = BTreeSet::new();
for t in self.0.iter() {
if acc.insert(t.value_type_tag()) && acc.len() > 1 {
// We inserted a second or subsequent value.
return false;
}
}
!acc.is_empty()
}
}

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// Copyright 2018 Mozilla
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not use
// this file except in compliance with the License. You may obtain a copy of the
// License at http://www.apache.org/licenses/LICENSE-2.0
// Unless required by applicable law or agreed to in writing, software distributed
// under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
// CONDITIONS OF ANY KIND, either express or implied. See the License for the
// specific language governing permissions and limitations under the License.
use std::fmt;
use std::rc::Rc;
use ::enum_set::EnumSet;
use ::ordered_float::OrderedFloat;
use ::uuid::Uuid;
use ::chrono::{
DateTime,
Timelike, // For truncation.
};
use ::edn::{
self,
FromMicros,
NamespacedKeyword,
Utc,
};
use values;
/// Represents one entid in the entid space.
///
/// Per https://www.sqlite.org/datatype3.html (see also http://stackoverflow.com/a/8499544), SQLite
/// stores signed integers up to 64 bits in size. Since u32 is not appropriate for our use case, we
/// use i64 rather than manually truncating u64 to u63 and casting to i64 throughout the codebase.
pub type Entid = i64;
/// An entid that's either already in the store, or newly allocated to a tempid.
/// TODO: we'd like to link this in some way to the lifetime of a particular PartitionMap.
#[derive(Clone, Copy, Debug, Hash, Eq, PartialEq, Ord, PartialOrd)]
pub struct KnownEntid(pub Entid);
impl From<KnownEntid> for Entid {
fn from(k: KnownEntid) -> Entid {
k.0
}
}
impl From<KnownEntid> for TypedValue {
fn from(k: KnownEntid) -> TypedValue {
TypedValue::Ref(k.0)
}
}
/// The attribute of each Mentat assertion has a :db/valueType constraining the value to a
/// particular set. Mentat recognizes the following :db/valueType values.
#[derive(Clone, Copy, Debug, Eq, Hash, Ord, PartialOrd, PartialEq)]
#[repr(u32)]
pub enum ValueType {
Ref,
Boolean,
Instant,
Long,
Double,
String,
Keyword,
Uuid,
}
pub type ValueTypeTag = i32;
impl ValueType {
pub fn all_enums() -> EnumSet<ValueType> {
// TODO: lazy_static.
let mut s = EnumSet::new();
s.insert(ValueType::Ref);
s.insert(ValueType::Boolean);
s.insert(ValueType::Instant);
s.insert(ValueType::Long);
s.insert(ValueType::Double);
s.insert(ValueType::String);
s.insert(ValueType::Keyword);
s.insert(ValueType::Uuid);
s
}
}
impl ::enum_set::CLike for ValueType {
fn to_u32(&self) -> u32 {
*self as u32
}
unsafe fn from_u32(v: u32) -> ValueType {
::std::mem::transmute(v)
}
}
impl ValueType {
pub fn into_keyword(self) -> NamespacedKeyword {
NamespacedKeyword::new("db.type", match self {
ValueType::Ref => "ref",
ValueType::Boolean => "boolean",
ValueType::Instant => "instant",
ValueType::Long => "long",
ValueType::Double => "double",
ValueType::String => "string",
ValueType::Keyword => "keyword",
ValueType::Uuid => "uuid",
})
}
pub fn into_typed_value(self) -> TypedValue {
TypedValue::typed_ns_keyword("db.type", match self {
ValueType::Ref => "ref",
ValueType::Boolean => "boolean",
ValueType::Instant => "instant",
ValueType::Long => "long",
ValueType::Double => "double",
ValueType::String => "string",
ValueType::Keyword => "keyword",
ValueType::Uuid => "uuid",
})
}
pub fn into_edn_value(self) -> edn::Value {
match self {
ValueType::Ref => values::DB_TYPE_REF.clone(),
ValueType::Boolean => values::DB_TYPE_BOOLEAN.clone(),
ValueType::Instant => values::DB_TYPE_INSTANT.clone(),
ValueType::Long => values::DB_TYPE_LONG.clone(),
ValueType::Double => values::DB_TYPE_DOUBLE.clone(),
ValueType::String => values::DB_TYPE_STRING.clone(),
ValueType::Keyword => values::DB_TYPE_KEYWORD.clone(),
ValueType::Uuid => values::DB_TYPE_UUID.clone(),
}
}
}
impl fmt::Display for ValueType {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{}", match *self {
ValueType::Ref => ":db.type/ref",
ValueType::Boolean => ":db.type/boolean",
ValueType::Instant => ":db.type/instant",
ValueType::Long => ":db.type/long",
ValueType::Double => ":db.type/double",
ValueType::String => ":db.type/string",
ValueType::Keyword => ":db.type/keyword",
ValueType::Uuid => ":db.type/uuid",
})
}
}
/// Represents a value that can be stored in a Mentat store.
// TODO: expand to include :db.type/uri. https://github.com/mozilla/mentat/issues/201
// TODO: JSON data type? https://github.com/mozilla/mentat/issues/31
// TODO: BigInt? Bytes?
#[derive(Clone, Debug, Eq, Hash, Ord, PartialOrd, PartialEq, Serialize, Deserialize)]
pub enum TypedValue {
Ref(Entid),
Boolean(bool),
Long(i64),
Double(OrderedFloat<f64>),
Instant(DateTime<Utc>), // Use `into()` to ensure truncation.
// TODO: &str throughout?
String(Rc<String>),
Keyword(Rc<NamespacedKeyword>),
Uuid(Uuid), // It's only 128 bits, so this should be acceptable to clone.
}
impl TypedValue {
/// Returns true if the provided type is `Some` and matches this value's type, or if the
/// provided type is `None`.
#[inline]
pub fn is_congruent_with<T: Into<Option<ValueType>>>(&self, t: T) -> bool {
t.into().map_or(true, |x| self.matches_type(x))
}
#[inline]
pub fn matches_type(&self, t: ValueType) -> bool {
self.value_type() == t
}
pub fn value_type(&self) -> ValueType {
match self {
&TypedValue::Ref(_) => ValueType::Ref,
&TypedValue::Boolean(_) => ValueType::Boolean,
&TypedValue::Long(_) => ValueType::Long,
&TypedValue::Instant(_) => ValueType::Instant,
&TypedValue::Double(_) => ValueType::Double,
&TypedValue::String(_) => ValueType::String,
&TypedValue::Keyword(_) => ValueType::Keyword,
&TypedValue::Uuid(_) => ValueType::Uuid,
}
}
/// Construct a new `TypedValue::Keyword` instance by cloning the provided
/// values and wrapping them in a new `Rc`. This is expensive, so this might
/// be best limited to tests.
pub fn typed_ns_keyword(ns: &str, name: &str) -> TypedValue {
TypedValue::Keyword(Rc::new(NamespacedKeyword::new(ns, name)))
}
/// Construct a new `TypedValue::String` instance by cloning the provided
/// value and wrapping it in a new `Rc`. This is expensive, so this might
/// be best limited to tests.
pub fn typed_string(s: &str) -> TypedValue {
TypedValue::String(Rc::new(s.to_string()))
}
pub fn current_instant() -> TypedValue {
Utc::now().into()
}
/// Construct a new `TypedValue::Instant` instance from the provided
/// microsecond timestamp.
pub fn instant(micros: i64) -> TypedValue {
DateTime::<Utc>::from_micros(micros).into()
}
}
trait MicrosecondPrecision {
/// Truncate the provided `DateTime` to microsecond precision.
fn microsecond_precision(self) -> Self;
}
impl MicrosecondPrecision for DateTime<Utc> {
fn microsecond_precision(self) -> DateTime<Utc> {
let nanoseconds = self.nanosecond();
if nanoseconds % 1000 == 0 {
return self;
}
let microseconds = nanoseconds / 1000;
let truncated = microseconds * 1000;
self.with_nanosecond(truncated).expect("valid timestamp")
}
}
/// Return the current time as a UTC `DateTime` instance with microsecond precision.
pub fn now() -> DateTime<Utc> {
Utc::now().microsecond_precision()
}
// We don't do From<i64> or From<Entid> 'cos it's ambiguous.
impl From<bool> for TypedValue {
fn from(value: bool) -> TypedValue {
TypedValue::Boolean(value)
}
}
/// Truncate the provided `DateTime` to microsecond precision, and return the corresponding
/// `TypedValue::Instant`.
impl From<DateTime<Utc>> for TypedValue {
fn from(value: DateTime<Utc>) -> TypedValue {
TypedValue::Instant(value.microsecond_precision())
}
}
impl From<Uuid> for TypedValue {
fn from(value: Uuid) -> TypedValue {
TypedValue::Uuid(value)
}
}
impl<'a> From<&'a str> for TypedValue {
fn from(value: &'a str) -> TypedValue {
TypedValue::String(Rc::new(value.to_string()))
}
}
impl From<String> for TypedValue {
fn from(value: String) -> TypedValue {
TypedValue::String(Rc::new(value))
}
}
impl From<NamespacedKeyword> for TypedValue {
fn from(value: NamespacedKeyword) -> TypedValue {
TypedValue::Keyword(Rc::new(value))
}
}
impl From<u32> for TypedValue {
fn from(value: u32) -> TypedValue {
TypedValue::Long(value as i64)
}
}
impl From<i32> for TypedValue {
fn from(value: i32) -> TypedValue {
TypedValue::Long(value as i64)
}
}
impl From<f64> for TypedValue {
fn from(value: f64) -> TypedValue {
TypedValue::Double(OrderedFloat(value))
}
}
impl TypedValue {
pub fn into_known_entid(self) -> Option<KnownEntid> {
match self {
TypedValue::Ref(v) => Some(KnownEntid(v)),
_ => None,
}
}
pub fn into_entid(self) -> Option<Entid> {
match self {
TypedValue::Ref(v) => Some(v),
_ => None,
}
}
pub fn into_kw(self) -> Option<Rc<NamespacedKeyword>> {
match self {
TypedValue::Keyword(v) => Some(v),
_ => None,
}
}
pub fn into_boolean(self) -> Option<bool> {
match self {
TypedValue::Boolean(v) => Some(v),
_ => None,
}
}
pub fn into_long(self) -> Option<i64> {
match self {
TypedValue::Long(v) => Some(v),
_ => None,
}
}
pub fn into_double(self) -> Option<f64> {
match self {
TypedValue::Double(v) => Some(v.into_inner()),
_ => None,
}
}
pub fn into_instant(self) -> Option<DateTime<Utc>> {
match self {
TypedValue::Instant(v) => Some(v),
_ => None,
}
}
pub fn into_timestamp(self) -> Option<i64> {
match self {
TypedValue::Instant(v) => Some(v.timestamp()),
_ => None,
}
}
pub fn into_string(self) -> Option<Rc<String>> {
match self {
TypedValue::String(v) => Some(v),
_ => None,
}
}
pub fn into_uuid(self) -> Option<Uuid> {
match self {
TypedValue::Uuid(v) => Some(v),
_ => None,
}
}
pub fn into_uuid_string(self) -> Option<String> {
match self {
TypedValue::Uuid(v) => Some(v.hyphenated().to_string()),
_ => None,
}
}
}
#[test]
fn test_typed_value() {
assert!(TypedValue::Boolean(false).is_congruent_with(None));
assert!(TypedValue::Boolean(false).is_congruent_with(ValueType::Boolean));
assert!(!TypedValue::typed_string("foo").is_congruent_with(ValueType::Boolean));
assert!(TypedValue::typed_string("foo").is_congruent_with(ValueType::String));
assert!(TypedValue::typed_string("foo").is_congruent_with(None));
}

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// Copyright 2018 Mozilla
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not use
// this file except in compliance with the License. You may obtain a copy of the
// License at http://www.apache.org/licenses/LICENSE-2.0
// Unless required by applicable law or agreed to in writing, software distributed
// under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
// CONDITIONS OF ANY KIND, either express or implied. See the License for the
// specific language governing permissions and limitations under the License.
use ::enum_set::{
EnumSet,
};
use ::types::{
ValueType,
};
trait EnumSetExtensions<T: ::enum_set::CLike + Clone> {
/// Return a set containing both `x` and `y`.
fn of_both(x: T, y: T) -> EnumSet<T>;
/// Return a clone of `self` with `y` added.
fn with(&self, y: T) -> EnumSet<T>;
}
impl<T: ::enum_set::CLike + Clone> EnumSetExtensions<T> for EnumSet<T> {
/// Return a set containing both `x` and `y`.
fn of_both(x: T, y: T) -> Self {
let mut o = EnumSet::new();
o.insert(x);
o.insert(y);
o
}
/// Return a clone of `self` with `y` added.
fn with(&self, y: T) -> EnumSet<T> {
let mut o = self.clone();
o.insert(y);
o
}
}
#[derive(Clone, Copy, Debug, Eq, PartialEq)]
pub struct ValueTypeSet(pub EnumSet<ValueType>);
impl Default for ValueTypeSet {
fn default() -> ValueTypeSet {
ValueTypeSet::any()
}
}
impl ValueTypeSet {
pub fn any() -> ValueTypeSet {
ValueTypeSet(ValueType::all_enums())
}
pub fn none() -> ValueTypeSet {
ValueTypeSet(EnumSet::new())
}
/// Return a set containing only `t`.
pub fn of_one(t: ValueType) -> ValueTypeSet {
let mut s = EnumSet::new();
s.insert(t);
ValueTypeSet(s)
}
/// Return a set containing `Double` and `Long`.
pub fn of_numeric_types() -> ValueTypeSet {
ValueTypeSet(EnumSet::of_both(ValueType::Double, ValueType::Long))
}
/// Return a set containing `Double`, `Long`, and `Instant`.
pub fn of_numeric_and_instant_types() -> ValueTypeSet {
let mut s = EnumSet::new();
s.insert(ValueType::Double);
s.insert(ValueType::Long);
s.insert(ValueType::Instant);
ValueTypeSet(s)
}
/// Return a set containing `Ref` and `Keyword`.
pub fn of_keywords() -> ValueTypeSet {
ValueTypeSet(EnumSet::of_both(ValueType::Ref, ValueType::Keyword))
}
/// Return a set containing `Ref` and `Long`.
pub fn of_longs() -> ValueTypeSet {
ValueTypeSet(EnumSet::of_both(ValueType::Ref, ValueType::Long))
}
}
impl ValueTypeSet {
pub fn insert(&mut self, vt: ValueType) -> bool {
self.0.insert(vt)
}
pub fn len(&self) -> usize {
self.0.len()
}
/// Returns a set containing all the types in this set and `other`.
pub fn union(&self, other: &ValueTypeSet) -> ValueTypeSet {
ValueTypeSet(self.0.union(other.0))
}
pub fn intersection(&self, other: &ValueTypeSet) -> ValueTypeSet {
ValueTypeSet(self.0.intersection(other.0))
}
/// Returns the set difference between `self` and `other`, which is the
/// set of items in `self` that are not in `other`.
pub fn difference(&self, other: &ValueTypeSet) -> ValueTypeSet {
ValueTypeSet(self.0 - other.0)
}
/// Return an arbitrary type that's part of this set.
/// For a set containing a single type, this will be that type.
pub fn exemplar(&self) -> Option<ValueType> {
self.0.iter().next()
}
pub fn is_subset(&self, other: &ValueTypeSet) -> bool {
self.0.is_subset(&other.0)
}
/// Returns true if `self` and `other` contain no items in common.
pub fn is_disjoint(&self, other: &ValueTypeSet) -> bool {
self.0.is_disjoint(&other.0)
}
pub fn contains(&self, vt: ValueType) -> bool {
self.0.contains(&vt)
}
pub fn is_empty(&self) -> bool {
self.0.is_empty()
}
pub fn is_unit(&self) -> bool {
self.0.len() == 1
}
pub fn iter(&self) -> ::enum_set::Iter<ValueType> {
self.0.iter()
}
}
impl From<ValueType> for ValueTypeSet {
fn from(t: ValueType) -> Self {
ValueTypeSet::of_one(t)
}
}
impl ValueTypeSet {
pub fn is_only_numeric(&self) -> bool {
self.is_subset(&ValueTypeSet::of_numeric_types())
}
}
impl IntoIterator for ValueTypeSet {
type Item = ValueType;
type IntoIter = ::enum_set::Iter<ValueType>;
fn into_iter(self) -> Self::IntoIter {
self.0.into_iter()
}
}
impl ::std::iter::FromIterator<ValueType> for ValueTypeSet {
fn from_iter<I: IntoIterator<Item = ValueType>>(iterator: I) -> Self {
let mut ret = Self::none();
ret.0.extend(iterator);
ret
}
}
impl ::std::iter::Extend<ValueType> for ValueTypeSet {
fn extend<I: IntoIterator<Item = ValueType>>(&mut self, iter: I) {
for element in iter {
self.0.insert(element);
}
}
}