452 lines
18 KiB
Rust
452 lines
18 KiB
Rust
use std::borrow::Cow;
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use std::cmp::Ordering;
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use std::fmt::Debug;
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use std::hash::{Hash, Hasher};
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use std::vec::Vec;
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pub use std::collections::BTreeSet as Set;
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pub use std::collections::BTreeMap as Map;
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pub mod float;
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pub mod signed_integer;
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pub use float::Float;
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pub use float::Double;
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pub use signed_integer::SignedInteger;
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/// The kinds of `Value` from the specification.
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#[derive(Debug, Clone, PartialEq, Eq, Hash, PartialOrd, Ord)]
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pub enum ValueClass {
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Atomic(AtomClass),
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Compound(CompoundClass),
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Embedded,
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}
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/// The kinds of `Atom` from the specification.
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#[derive(Debug, Clone, PartialEq, Eq, Hash, PartialOrd, Ord)]
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pub enum AtomClass {
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Boolean,
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Float,
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Double,
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SignedInteger,
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String,
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ByteString,
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Symbol,
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}
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/// The kinds of `Compound` from the specification.
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#[derive(Debug, Clone, PartialEq, Eq, Hash, PartialOrd, Ord)]
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pub enum CompoundClass {
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Record,
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Sequence,
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Set,
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Dictionary,
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}
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pub trait Domain: Debug + Eq + Hash + Ord + Clone {}
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#[derive(Debug)]
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pub struct OutOfRange;
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pub trait Value<D: Domain>: Debug {
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fn value_class(&self) -> ValueClass;
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fn as_boolean(&self) -> Option<bool> { None }
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fn as_float(&self) -> Option<f32> { None }
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fn as_double(&self) -> Option<f64> { None }
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fn is_signed_integer(&self) -> bool { false }
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fn as_signed_integer(&self) -> Option<Cow<'_, SignedInteger>> { None }
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fn as_string(&self) -> Option<Cow<'_, str>> { None }
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fn as_bytestring(&self) -> Option<Cow<'_, [u8]>> { None }
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fn as_symbol(&self) -> Option<Cow<'_, str>> { None }
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fn is_record(&self) -> bool { false }
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fn label(&self) -> Option<&dyn Value<D>> { None }
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fn is_sequence(&self) -> bool { false }
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fn len(&self) -> Option<usize> { None }
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fn index(&self, _i: usize) -> &dyn Value<D> { panic!("Not a sequence") }
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fn iter(&self) -> Option<Box<dyn Iterator<Item = &dyn Value<D>> + '_>> { None }
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fn is_set(&self) -> bool { false }
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fn has(&self, _v: &dyn Value<D>) -> bool { false }
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fn is_dictionary(&self) -> bool { false }
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fn get<'v>(&'v self, _k: &'v dyn Value<D>) -> Option<&'v dyn Value<D>> { None }
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fn entries(&self) -> Option<Box<dyn Iterator<Item = (&dyn Value<D>, &dyn Value<D>)> + '_>> { None }
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fn is_embedded(&self) -> bool { false }
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fn embedded(&self) -> Option<Cow<'_, D>> { None }
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fn annotations(&self) -> Option<&[Box<dyn Value<D>>]> { None }
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}
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pub fn value<D: Domain, V: Value<D>>(v: &V) -> &dyn Value<D> {
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v
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}
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impl<'a, D: Domain, V: Value<D> + ?Sized> Value<D> for &'a V {
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fn value_class(&self) -> ValueClass { (*self).value_class() }
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fn as_boolean(&self) -> Option<bool> { (*self).as_boolean() }
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fn as_float(&self) -> Option<f32> { (*self).as_float() }
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fn as_double(&self) -> Option<f64> { (*self).as_double() }
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fn is_signed_integer(&self) -> bool { (*self).is_signed_integer() }
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fn as_signed_integer(&self) -> Option<Cow<'_, SignedInteger>> { (*self).as_signed_integer() }
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fn as_string(&self) -> Option<Cow<'_, str>> { (*self).as_string() }
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fn as_bytestring(&self) -> Option<Cow<'_, [u8]>> { (*self).as_bytestring() }
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fn as_symbol(&self) -> Option<Cow<'_, str>> { (*self).as_symbol() }
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fn is_record(&self) -> bool { (*self).is_record() }
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fn label(&self) -> Option<&dyn Value<D>> { (*self).label() }
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fn is_sequence(&self) -> bool { (*self).is_sequence() }
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fn len(&self) -> Option<usize> { (*self).len() }
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fn index(&self, i: usize) -> &dyn Value<D> { (*self).index(i) }
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fn is_set(&self) -> bool { (*self).is_set() }
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fn has(&self, v: &dyn Value<D>) -> bool { (*self).has(v) }
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fn is_dictionary(&self) -> bool { (*self).is_dictionary() }
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fn get<'v>(&'v self, k: &'v dyn Value<D>) -> Option<&'v dyn Value<D>> { (*self).get(k) }
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fn entries(&self) -> Option<Box<dyn Iterator<Item = (&dyn Value<D>, &dyn Value<D>)> + '_>> { (*self).entries() }
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fn is_embedded(&self) -> bool { (*self).is_embedded() }
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fn embedded(&self) -> Option<Cow<'_, D>> { (*self).embedded() }
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fn annotations(&self) -> Option<&[Box<dyn Value<D>>]> { (*self).annotations() }
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}
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impl<D: Domain> Value<D> for Box<dyn Value<D>> {
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fn value_class(&self) -> ValueClass { self.as_ref().value_class() }
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fn as_boolean(&self) -> Option<bool> { self.as_ref().as_boolean() }
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fn as_float(&self) -> Option<f32> { self.as_ref().as_float() }
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fn as_double(&self) -> Option<f64> { self.as_ref().as_double() }
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fn is_signed_integer(&self) -> bool { self.as_ref().is_signed_integer() }
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fn as_signed_integer(&self) -> Option<Cow<'_, SignedInteger>> { self.as_ref().as_signed_integer() }
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fn as_string(&self) -> Option<Cow<'_, str>> { self.as_ref().as_string() }
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fn as_bytestring(&self) -> Option<Cow<'_, [u8]>> { self.as_ref().as_bytestring() }
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fn as_symbol(&self) -> Option<Cow<'_, str>> { self.as_ref().as_symbol() }
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fn is_record(&self) -> bool { self.as_ref().is_record() }
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fn label(&self) -> Option<&dyn Value<D>> { self.as_ref().label() }
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fn is_sequence(&self) -> bool { self.as_ref().is_sequence() }
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fn len(&self) -> Option<usize> { self.as_ref().len() }
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fn index(&self, i: usize) -> &dyn Value<D> { self.as_ref().index(i) }
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fn is_set(&self) -> bool { self.as_ref().is_set() }
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fn has(&self, v: &dyn Value<D>) -> bool { self.as_ref().has(v) }
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fn is_dictionary(&self) -> bool { self.as_ref().is_dictionary() }
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fn get<'v>(&'v self, k: &'v dyn Value<D>) -> Option<&'v dyn Value<D>> { self.as_ref().get(k) }
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fn entries(&self) -> Option<Box<dyn Iterator<Item = (&dyn Value<D>, &dyn Value<D>)> + '_>> { self.as_ref().entries() }
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fn is_embedded(&self) -> bool { self.as_ref().is_embedded() }
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fn embedded(&self) -> Option<Cow<'_, D>> { self.as_ref().embedded() }
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fn annotations(&self) -> Option<&[Box<dyn Value<D>>]> { self.as_ref().annotations() }
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}
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impl<'a, D: Domain> Hash for dyn Value<D> + 'a {
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fn hash<H: Hasher>(&self, state: &mut H) {
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match self.value_class() {
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ValueClass::Atomic(a) => match a {
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AtomClass::Boolean => self.as_boolean().unwrap().hash(state),
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AtomClass::Float => self.as_float().unwrap().to_bits().hash(state),
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AtomClass::Double => self.as_double().unwrap().to_bits().hash(state),
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AtomClass::SignedInteger => self.as_signed_integer().unwrap().hash(state),
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AtomClass::String => self.as_string().unwrap().hash(state),
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AtomClass::ByteString => self.as_bytestring().unwrap().hash(state),
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AtomClass::Symbol => self.as_symbol().unwrap().hash(state),
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}
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ValueClass::Compound(c) => match c {
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CompoundClass::Sequence |
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CompoundClass::Set => {
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state.write_usize(self.len().unwrap());
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for v in self.iter().unwrap() { v.hash(state) }
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}
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CompoundClass::Record => {
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self.label().unwrap().hash(state);
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state.write_usize(self.len().unwrap());
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for v in self.iter().unwrap() { v.hash(state) }
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}
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CompoundClass::Dictionary => {
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state.write_usize(self.len().unwrap());
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for (k, v) in self.entries().unwrap() {
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k.hash(state);
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v.hash(state);
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}
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}
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}
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ValueClass::Embedded => self.embedded().unwrap().hash(state),
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}
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}
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}
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fn iters_eq<'a, D: Domain>(
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mut i1: Box<dyn Iterator<Item = &dyn Value<D>> + 'a>,
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mut i2: Box<dyn Iterator<Item = &dyn Value<D>> + 'a>,
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) -> bool {
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loop {
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match i1.next() {
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None => return i2.next().is_none(),
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Some(v1) => match i2.next() {
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None => return false,
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Some(v2) => if v1 != v2 { return false; },
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}
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}
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}
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}
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impl<'a, D: Domain> PartialEq for dyn Value<D> + 'a {
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fn eq(&self, other: &Self) -> bool {
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let cls = self.value_class();
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if cls != other.value_class() { return false; }
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match cls {
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ValueClass::Atomic(a) => match a {
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AtomClass::Boolean =>
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self.as_boolean().unwrap() == other.as_boolean().unwrap(),
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AtomClass::Float =>
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Float(self.as_float().unwrap()) == Float(other.as_float().unwrap()),
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AtomClass::Double =>
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Double(self.as_double().unwrap()) == Double(other.as_double().unwrap()),
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AtomClass::SignedInteger =>
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self.as_signed_integer().unwrap() == other.as_signed_integer().unwrap(),
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AtomClass::String =>
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self.as_string().unwrap() == other.as_string().unwrap(),
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AtomClass::ByteString =>
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self.as_bytestring().unwrap() == other.as_bytestring().unwrap(),
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AtomClass::Symbol =>
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self.as_symbol().unwrap() == other.as_symbol().unwrap(),
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}
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ValueClass::Compound(c) => match c {
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CompoundClass::Record => {
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if self.label().unwrap() != other.label().unwrap() { return false; }
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iters_eq(self.iter().unwrap(), other.iter().unwrap())
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}
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CompoundClass::Sequence => {
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iters_eq(self.iter().unwrap(), other.iter().unwrap())
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}
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CompoundClass::Set => {
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let s1 = self.iter().unwrap().collect::<Set<_>>();
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let s2 = other.iter().unwrap().collect::<Set<_>>();
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s1 == s2
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}
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CompoundClass::Dictionary => {
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let d1 = self.entries().unwrap().collect::<Map<_, _>>();
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let d2 = other.entries().unwrap().collect::<Map<_, _>>();
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d1 == d2
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}
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}
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ValueClass::Embedded => self.embedded().unwrap() == other.embedded().unwrap(),
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}
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}
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}
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impl<'a, D: Domain> Ord for dyn Value<D> + 'a {
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fn cmp(&self, other: &Self) -> Ordering {
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let cls = self.value_class();
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match cls.cmp(&other.value_class()) {
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Ordering::Less => Ordering::Less,
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Ordering::Greater => Ordering::Greater,
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Ordering::Equal => match cls {
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ValueClass::Atomic(a) => match a {
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AtomClass::Boolean =>
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self.as_boolean().cmp(&other.as_boolean()),
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AtomClass::Float =>
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Float(self.as_float().unwrap()).cmp(&Float(other.as_float().unwrap())),
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AtomClass::Double =>
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Double(self.as_double().unwrap()).cmp(&Double(other.as_double().unwrap())),
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AtomClass::SignedInteger =>
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self.as_signed_integer().cmp(&other.as_signed_integer()),
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AtomClass::String =>
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self.as_string().cmp(&other.as_string()),
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AtomClass::ByteString =>
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self.as_bytestring().cmp(&other.as_bytestring()),
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AtomClass::Symbol =>
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self.as_symbol().cmp(&other.as_symbol()),
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},
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ValueClass::Compound(c) => match c {
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_ => todo!(),
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},
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ValueClass::Embedded =>
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self.embedded().cmp(&other.embedded()),
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}
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}
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}
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}
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impl<'a, D: Domain> Eq for dyn Value<D> + 'a {}
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impl<'a, D: Domain> PartialOrd for dyn Value<D> + 'a {
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fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
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Some(self.cmp(other))
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}
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}
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#[derive(Debug, Clone, PartialEq, Eq, Hash, PartialOrd, Ord)]
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pub enum NoValue {}
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impl Domain for NoValue {}
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impl<D: Domain> Value<D> for NoValue {
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fn value_class(&self) -> ValueClass { unreachable!() }
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}
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impl<D: Domain> Value<D> for bool {
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fn value_class(&self) -> ValueClass { ValueClass::Atomic(AtomClass::Boolean) }
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fn as_boolean(&self) -> Option<bool> { Some(*self) }
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}
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impl<D: Domain> Value<D> for u64 {
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fn value_class(&self) -> ValueClass { ValueClass::Atomic(AtomClass::SignedInteger) }
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fn as_signed_integer(&self) -> Option<Cow<'_, SignedInteger>> {
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Some(Cow::Owned((*self).into()))
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}
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}
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impl<D: Domain> Value<D> for Float {
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fn value_class(&self) -> ValueClass { ValueClass::Atomic(AtomClass::Float) }
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fn as_float(&self) -> Option<f32> { Some(self.0) }
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fn as_double(&self) -> Option<f64> { Some(self.0 as f64) }
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}
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impl<D: Domain> Value<D> for str {
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fn value_class(&self) -> ValueClass { ValueClass::Atomic(AtomClass::String) }
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fn as_string(&self) -> Option<Cow<'_, str>> { Some(Cow::Borrowed(self)) }
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}
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impl<D: Domain> Value<D> for String {
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fn value_class(&self) -> ValueClass { ValueClass::Atomic(AtomClass::String) }
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fn as_string(&self) -> Option<Cow<'_, str>> { Some(Cow::Borrowed(self)) }
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}
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impl<D: Domain, V: Value<D>> Value<D> for Vec<V> {
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fn value_class(&self) -> ValueClass { ValueClass::Compound(CompoundClass::Sequence) }
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fn is_sequence(&self) -> bool { true }
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fn len(&self) -> Option<usize> { Some(self.len()) }
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fn index(&self, i: usize) -> &dyn Value<D> { &self[i] }
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fn iter(&self) -> Option<Box<dyn Iterator<Item = &dyn Value<D>> + '_>> {
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Some(Box::new(self[..].iter().map(value)))
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}
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}
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impl<D: Domain, V: Value<D>> Value<D> for [V] {
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fn value_class(&self) -> ValueClass { ValueClass::Compound(CompoundClass::Sequence) }
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fn is_sequence(&self) -> bool { true }
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fn len(&self) -> Option<usize> { Some(self.len()) }
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fn index(&self, i: usize) -> &dyn Value<D> { &self[i] }
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fn iter(&self) -> Option<Box<dyn Iterator<Item = &dyn Value<D>> + '_>> {
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Some(Box::new(self[..].iter().map(value)))
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}
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}
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impl<D: Domain> Value<D> for Set<Box<dyn Value<D>>> {
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fn value_class(&self) -> ValueClass { ValueClass::Compound(CompoundClass::Set) }
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fn is_set(&self) -> bool { true }
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fn len(&self) -> Option<usize> { Some(self.len()) }
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fn has(&self, v: &dyn Value<D>) -> bool { self.contains(v) }
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fn iter(&self) -> Option<Box<dyn Iterator<Item = &dyn Value<D>> + '_>> {
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Some(Box::new(self.iter().map(value)))
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}
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}
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impl<D: Domain, V: Value<D>> Value<D> for Map<Box<dyn Value<D>>, V> {
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fn value_class(&self) -> ValueClass { ValueClass::Compound(CompoundClass::Dictionary) }
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fn is_dictionary(&self) -> bool { true }
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fn len(&self) -> Option<usize> { Some(self.len()) }
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fn has(&self, v: &dyn Value<D>) -> bool { self.contains_key(v) }
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fn get<'v>(&'v self, k: &'v dyn Value<D>) -> Option<&'v dyn Value<D>> {
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match Map::get(self, k) {
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Some(v) => Some(v),
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None => None,
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}
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}
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fn entries(&self) -> Option<Box<dyn Iterator<Item = (&dyn Value<D>, &dyn Value<D>)> + '_>> {
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Some(Box::new(self.iter().map(|(k,v)| (value(k), value(v)))))
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}
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}
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#[derive(Debug, Clone, PartialEq, Eq, Hash, PartialOrd, Ord)]
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pub struct Record<V>(Vec<V> /* at least one element, for the label */);
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impl<D: Domain, V: Value<D>> Value<D> for Record<V> {
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fn value_class(&self) -> ValueClass { ValueClass::Compound(CompoundClass::Record) }
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fn is_record(&self) -> bool { true }
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fn label(&self) -> Option<&dyn Value<D>> { Some(&self.0[0]) }
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fn len(&self) -> Option<usize> { Some(self.0.len() - 1) }
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fn index(&self, i: usize) -> &dyn Value<D> { &self.0[i + 1] }
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}
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#[derive(Debug)]
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pub struct Annotations<D: Domain, V: Value<D>>(V, Vec<Box<dyn Value<D>>>);
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impl<D: Domain, V: Value<D>> Annotations<D, V> {
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pub fn value(&self) -> &dyn Value<D> {
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&self.0
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}
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}
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impl<D: Domain, V: Value<D>> Value<D> for Annotations<D, V> {
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fn value_class(&self) -> ValueClass { self.value().value_class() }
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fn as_boolean(&self) -> Option<bool> { self.value().as_boolean() }
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fn as_float(&self) -> Option<f32> { self.value().as_float() }
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fn as_double(&self) -> Option<f64> { self.value().as_double() }
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fn is_signed_integer(&self) -> bool { self.value().is_signed_integer() }
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fn as_signed_integer(&self) -> Option<Cow<'_, SignedInteger>> { self.value().as_signed_integer() }
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fn as_string(&self) -> Option<Cow<'_, str>> { self.value().as_string() }
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fn as_bytestring(&self) -> Option<Cow<'_, [u8]>> { self.value().as_bytestring() }
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fn as_symbol(&self) -> Option<Cow<'_, str>> { self.value().as_symbol() }
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fn is_record(&self) -> bool { self.value().is_record() }
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fn label(&self) -> Option<&dyn Value<D>> { self.value().label() }
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fn is_sequence(&self) -> bool { self.value().is_sequence() }
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fn len(&self) -> Option<usize> { self.value().len() }
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fn index(&self, i: usize) -> &dyn Value<D> { self.value().index(i) }
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fn is_set(&self) -> bool { self.value().is_set() }
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fn has(&self, v: &dyn Value<D>) -> bool { self.value().has(v) }
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fn is_dictionary(&self) -> bool { self.value().is_dictionary() }
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fn get<'v>(&'v self, k: &'v dyn Value<D>) -> Option<&'v dyn Value<D>> { self.value().get(k) }
|
|
fn entries(&self) -> Option<Box<dyn Iterator<Item = (&dyn Value<D>, &dyn Value<D>)> + '_>> { self.value().entries() }
|
|
fn is_embedded(&self) -> bool { self.value().is_embedded() }
|
|
fn embedded(&self) -> Option<Cow<'_, D>> { self.value().embedded() }
|
|
fn annotations(&self) -> Option<&[Box<dyn Value<D>>]> { Some(&self.1) }
|
|
}
|
|
|
|
impl<D: Domain, V: Value<D>> PartialEq for Annotations<D, V> {
|
|
fn eq(&self, other: &Self) -> bool {
|
|
self.value().eq(&other.value())
|
|
}
|
|
}
|
|
|
|
impl<D: Domain, V: Value<D>> Eq for Annotations<D, V> {}
|
|
|
|
impl<D: Domain, V: Value<D>> Hash for Annotations<D, V> {
|
|
fn hash<H: Hasher>(&self, state: &mut H) {
|
|
self.value().hash(state);
|
|
}
|
|
}
|
|
|
|
impl<D: Domain, V: Value<D>> PartialOrd for Annotations<D, V> {
|
|
fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
|
|
Some(self.cmp(other))
|
|
}
|
|
}
|
|
|
|
impl<D: Domain, V: Value<D>> Ord for Annotations<D, V> {
|
|
fn cmp(&self, other: &Self) -> Ordering {
|
|
self.value().cmp(&other.value())
|
|
}
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod demo {
|
|
use crate::*;
|
|
|
|
#[test] fn a() {
|
|
let mut v: Map<Box<dyn Value<NoValue>>, String> = Map::new();
|
|
v.insert(Box::new("abc"), "def".to_owned());
|
|
v.insert(Box::new(123), "xyz".to_owned());
|
|
v.insert(Box::new(vec![1, 2, 3]), "www".to_owned());
|
|
let w: &dyn Value<NoValue> = &v;
|
|
println!("GETw abc {:?}", w.get(&"abc"));
|
|
println!("GETw 123 {:?}", w.get(&123));
|
|
println!("GETw qqq {:?}", w.get(&"qqq"));
|
|
println!("GETv abc {:?}", v.get(value(&"abc")));
|
|
println!("GETv 123 {:?}", v.get(value(&123)));
|
|
println!("GETv qqq {:?}", v.get(value(&"qqq")));
|
|
for (kk, vv) in w.entries().unwrap() {
|
|
println!("{:?} {:?} ==> {:?} {:?}", kk.value_class(), kk, vv.value_class(), vv);
|
|
}
|
|
}
|
|
}
|