14776866710

Committed 01 May 2025 02:13PM UTC coverage: 77.956% (+0.3%) from 77.611%

Build # 14776866710

Build Type

Pull #227

github

Committed by

web-flow

Commit Message

Merge 57ddd5b7b into 3008f5ee2

Pull Request Pull Request #227: Remove obsolete code

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/lambda/src/expressions.rs

use crate::name::Name;
use astraea::tree::{BlobDigest, HashedValue, ReferenceIndex, Value, ValueDeserializationError};
use astraea::{
    storage::{LoadValue, StoreError, StoreValue},
    tree::ValueBlob,
};
use serde::{Deserialize, Serialize};
use std::fmt::Display;
use std::future::Future;
use std::hash::Hash;
use std::{
    collections::{BTreeMap, BTreeSet},
    pin::Pin,
    sync::Arc,
};

pub trait PrintExpression {
    fn print(&self, writer: &mut dyn std::fmt::Write, level: usize) -> std::fmt::Result;
}

#[derive(Debug, PartialEq, Eq, Ord, PartialOrd, Hash, Clone, Serialize, Deserialize)]
pub enum Expression<E, V>
where
    E: Clone + Display + PrintExpression,
    V: Clone + Display,
{
    Literal(V),
    Apply { callee: E, argument: E },
    ReadVariable(Name),
    Lambda { parameter_name: Name, body: E },
    Construct(Vec<E>),
}

impl<E, V> PrintExpression for Expression<E, V>
where
    E: Clone + Display + PrintExpression,
    V: Clone + Display,
{
    fn print(&self, writer: &mut dyn std::fmt::Write, level: usize) -> std::fmt::Result {
        match self {
            Expression::Literal(literal_value) => {
                write!(writer, "literal({})", literal_value)
            }
            Expression::Apply { callee, argument } => {
                callee.print(writer, level)?;
                write!(writer, "(")?;
                argument.print(writer, level)?;
                write!(writer, ")")
            }
            Expression::ReadVariable(name) => {
                write!(writer, "{}", &name.key)
            }
            Expression::Lambda {
                parameter_name,
                body,
            } => {
                write!(writer, "({}) =>\n", parameter_name)?;
                let indented = level + 1;
                for _ in 0..(indented * 2) {
                    write!(writer, " ")?;
                }
                body.print(writer, indented)
            }
            Expression::Construct(arguments) => {
                write!(writer, "construct(")?;
                for argument in arguments {
                    argument.print(writer, level)?;
                    write!(writer, ", ")?;
                }
                write!(writer, ")")
            }
        }
    }
}

impl<E, V> Expression<E, V>
where
    E: Clone + Display + PrintExpression,
    V: Clone + Display,
{
    pub fn make_literal(value: V) -> Self {
        Expression::Literal(value)
    }

    pub fn make_apply(callee: E, argument: E) -> Self {
        Expression::Apply { callee, argument }
    }

    pub fn make_lambda(parameter_name: Name, body: E) -> Self {
        Expression::Lambda {
            parameter_name,
            body,
        }
    }

    pub fn make_construct(arguments: Vec<E>) -> Self {
        Expression::Construct(arguments)
    }

    pub async fn map_child_expressions<
        't,
        Expr: Clone + Display + PrintExpression,
        V2: Clone + Display,
        Error,
        F,
        G,
    >(
        &self,
        transform_expression: &'t F,
        transform_value: &'t G,
    ) -> Result<Expression<Expr, V2>, Error>
    where
        F: Fn(&E) -> Pin<Box<dyn Future<Output = Result<Expr, Error>> + 't>>,
        G: Fn(&V) -> Pin<Box<dyn Future<Output = Result<V2, Error>> + 't>>,
    {
        match self {
            Expression::Literal(value) => Ok(Expression::Literal(transform_value(value).await?)),
            Expression::Apply { callee, argument } => Ok(Expression::Apply {
                callee: transform_expression(callee).await?,
                argument: transform_expression(argument).await?,
            }),
            Expression::ReadVariable(name) => Ok(Expression::ReadVariable(name.clone())),
            Expression::Lambda {
                parameter_name,
                body,
            } => Ok(Expression::Lambda {
                parameter_name: parameter_name.clone(),
                body: transform_expression(body).await?,
            }),
            Expression::Construct(items) => {
                let mut transformed_items = Vec::new();
                for item in items.iter() {
                    transformed_items.push(transform_expression(item).await?);
                }
                Ok(Expression::Construct(transformed_items))
            }
        }
    }
}

impl<E, V> Display for Expression<E, V>
where
    E: Clone + Display + PrintExpression,
    V: Clone + Display,
{
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        self.print(f, 0)
    }
}

#[derive(Debug, PartialEq, Eq, Ord, PartialOrd, Hash, Clone)]
pub struct DeepExpression(pub Expression<Arc<DeepExpression>, BlobDigest>);

impl PrintExpression for DeepExpression {
    fn print(&self, writer: &mut dyn std::fmt::Write, level: usize) -> std::fmt::Result {
        self.0.print(writer, level)
    }
}

impl PrintExpression for Arc<DeepExpression> {
    fn print(&self, writer: &mut dyn std::fmt::Write, level: usize) -> std::fmt::Result {
        self.0.print(writer, level)
    }
}

impl Display for DeepExpression {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        write!(f, "{}", self.0)
    }
}

pub type ShallowExpression = Expression<BlobDigest, BlobDigest>;

impl PrintExpression for BlobDigest {
    fn print(&self, writer: &mut dyn std::fmt::Write, _level: usize) -> std::fmt::Result {
        write!(writer, "{}", self)
    }
}

pub type ReferenceExpression = Expression<ReferenceIndex, ReferenceIndex>;

impl PrintExpression for ReferenceIndex {
    fn print(&self, writer: &mut dyn std::fmt::Write, _level: usize) -> std::fmt::Result {
        write!(writer, "{}", self)
    }
}

pub fn to_reference_expression(
    expression: &ShallowExpression,
) -> (ReferenceExpression, Vec<BlobDigest>) {
    match expression {
        Expression::Literal(value) => (
            ReferenceExpression::Literal(ReferenceIndex(0)),
            vec![*value],
        ),
        Expression::Apply { callee, argument } => (
            ReferenceExpression::Apply {
                callee: ReferenceIndex(0),
                argument: ReferenceIndex(1),
            },
            // TODO: deduplicate?
            vec![*callee, *argument],
        ),
        Expression::ReadVariable(name) => (ReferenceExpression::ReadVariable(name.clone()), vec![]),
        Expression::Lambda {
            parameter_name,
            body,
        } => (
            ReferenceExpression::Lambda {
                parameter_name: parameter_name.clone(),
                body: ReferenceIndex(0),
            },
            vec![*body],
        ),
        Expression::Construct(items) => (
            ReferenceExpression::Construct(
                (0..items.len())
                    .map(|index| ReferenceIndex(index as u64))
                    .collect(),
            ),
            // TODO: deduplicate?
            items.clone(),
        ),
    }
}

pub async fn deserialize_shallow(value: &Value) -> Result<ShallowExpression, ()> {
    let reference_expression: ReferenceExpression = postcard::from_bytes(value.blob().as_slice())
        .unwrap(/*TODO*/);
    reference_expression
        .map_child_expressions(
            &|child: &ReferenceIndex| -> Pin<Box<dyn Future<Output = Result<BlobDigest, ()>>>> {
                let child = value.references()[child.0 as usize].clone();
                Box::pin(async move { Ok(child) })
            },
            &|child: &ReferenceIndex| -> Pin<Box<dyn Future<Output = Result<BlobDigest, ()>>>> {
                let child = value.references()[child.0 as usize].clone();
                Box::pin(async move { Ok(child) })
            },
        )
        .await
}

pub async fn deserialize_recursively(
    root: &BlobDigest,
    load_value: &(dyn LoadValue + Sync),
) -> Result<DeepExpression, ()> {
    let root_loaded = load_value.load_value(root).await.unwrap(/*TODO*/).hash().unwrap(/*TODO*/);
    let shallow = deserialize_shallow(&root_loaded.value()).await?;
    let deep = shallow
        .map_child_expressions(
            &|child: &BlobDigest| -> Pin<Box<dyn Future<Output = Result<Arc<DeepExpression>, ()>>>> {
                let child = child.clone();
                Box::pin(async move { deserialize_recursively(&child, load_value)
                    .await
                    .map(|success| Arc::new(success)) })
            },
            &|child: &BlobDigest| -> Pin<Box<dyn Future<Output = Result<BlobDigest, ()>>>> {
                let child = child.clone();
                Box::pin(async move { Ok(child) })
            },
        )
        .await?;
    Ok(DeepExpression(deep))
}

pub fn expression_to_value(expression: &ShallowExpression) -> Value {
    let (reference_expression, references) = to_reference_expression(expression);
    let blob = postcard::to_allocvec(&reference_expression).unwrap(/*TODO*/);
    Value::new(
        ValueBlob::try_from(bytes::Bytes::from_owner(blob)).unwrap(/*TODO*/),
        references,
    )
}

pub async fn serialize_shallow(
    expression: &ShallowExpression,
    storage: &(dyn StoreValue + Sync),
) -> std::result::Result<BlobDigest, StoreError> {
    let value = expression_to_value(expression);
    storage
        .store_value(&HashedValue::from(Arc::new(value)))
        .await
}

pub async fn serialize_recursively(
    expression: &DeepExpression,
    storage: &(dyn StoreValue + Sync),
) -> std::result::Result<BlobDigest, StoreError> {
    let shallow_expression: ShallowExpression = expression
        .0
        .map_child_expressions(&|child: &Arc<DeepExpression>| -> Pin<
            Box<dyn Future<Output = Result<BlobDigest, StoreError>>>,
        > {
            let child = child.clone();
            Box::pin(async move {
                serialize_recursively(&child, storage)
                    .await
            })
        },&|child: &BlobDigest| -> Pin<
        Box<dyn Future<Output = Result<BlobDigest, StoreError>>>,
        > {
            let child = child.clone();
            Box::pin(async move {
                Ok(child)
            })
        })
        .await?;
    serialize_shallow(&shallow_expression, storage).await
}

#[derive(Debug)]
pub struct Closure {
    parameter_name: Name,
    body: Arc<DeepExpression>,
    captured_variables: BTreeMap<Name, BlobDigest>,
}

#[derive(Debug, Serialize, Deserialize)]
pub struct ClosureBlob {
    parameter_name: Name,
    captured_variables: BTreeMap<Name, ReferenceIndex>,
}

impl ClosureBlob {
    pub fn new(parameter_name: Name, captured_variables: BTreeMap<Name, ReferenceIndex>) -> Self {
        Self {
            parameter_name,
            captured_variables,
        }
    }
}

impl Closure {
    pub fn new(
        parameter_name: Name,
        body: Arc<DeepExpression>,
        captured_variables: BTreeMap<Name, BlobDigest>,
    ) -> Self {
        Self {
            parameter_name,
            body,
            captured_variables,
        }
    }

    pub async fn serialize(
        &self,
        store_value: &(dyn StoreValue + Sync),
    ) -> Result<BlobDigest, StoreError> {
        let mut references = vec![serialize_recursively(&self.body, store_value).await?];
        let mut captured_variables = BTreeMap::new();
        for (name, reference) in self.captured_variables.iter() {
            let index = ReferenceIndex(references.len() as u64);
            captured_variables.insert(name.clone(), index);
            references.push(reference.clone());
        }
        let closure_blob = ClosureBlob::new(self.parameter_name.clone(), captured_variables);
        let closure_blob_bytes = postcard::to_allocvec(&closure_blob).unwrap(/*TODO*/);
        store_value
            .store_value(&HashedValue::from(Arc::new(Value::new(
                ValueBlob::try_from(bytes::Bytes::from_owner(closure_blob_bytes)).unwrap(/*TODO*/),
                references,
            ))))
            .await
    }

    pub async fn deserialize(
        root: &BlobDigest,
        load_value: &(dyn LoadValue + Sync),
    ) -> Result<Closure, ValueDeserializationError> {
        let loaded_root = match load_value.load_value(root).await {
            Some(success) => success,
            None => return Err(ValueDeserializationError::BlobUnavailable(root.clone())),
        };
        let root_value = loaded_root.hash().unwrap(/*TODO*/).value().clone();
        let closure_blob: ClosureBlob = match postcard::from_bytes(&root_value.blob().as_slice()) {
            Ok(success) => success,
            Err(error) => return Err(ValueDeserializationError::Postcard(error)),
        };
        let body_reference = &root_value.references()[0];
        let body = deserialize_recursively(body_reference, load_value).await.unwrap(/*TODO*/);
        let mut captured_variables = BTreeMap::new();
        for (name, index) in closure_blob.captured_variables {
            let reference = &root_value.references()[index.0 as usize];
            captured_variables.insert(name, reference.clone());
        }
        Ok(Closure::new(
            closure_blob.parameter_name,
            Arc::new(body),
            captured_variables,
        ))
    }
}

async fn call_method(
    parameter_name: &Name,
    captured_variables: &BTreeMap<Name, BlobDigest>,
    body: &DeepExpression,
    argument: &BlobDigest,
    load_value: &(dyn LoadValue + Sync),
    store_value: &(dyn StoreValue + Sync),
    read_variable: &Arc<ReadVariable>,
) -> std::result::Result<BlobDigest, StoreError> {
    let read_variable_in_body: Arc<ReadVariable> = Arc::new({
        let parameter_name = parameter_name.clone();
        let argument = argument.clone();
        let captured_variables = captured_variables.clone();
        let read_variable = read_variable.clone();
        move |name: &Name| -> Pin<Box<dyn core::future::Future<Output = BlobDigest> + Send>> {
            if name == &parameter_name {
                let argument = argument.clone();
                Box::pin(core::future::ready(argument))
            } else if let Some(found) = captured_variables.get(name) {
                Box::pin(core::future::ready(found.clone()))
            } else {
                read_variable(name)
            }
        }
    });
    Box::pin(evaluate(
        &body,
        load_value,
        store_value,
        &read_variable_in_body,
    ))
    .await
}

pub type ReadVariable =
    dyn Fn(&Name) -> Pin<Box<dyn core::future::Future<Output = BlobDigest> + Send>> + Send + Sync;

fn find_captured_names(expression: &DeepExpression) -> BTreeSet<Name> {
    match &expression.0 {
        Expression::Literal(_blob_digest) => BTreeSet::new(),
        Expression::Apply { callee, argument } => {
            let mut result = find_captured_names(callee);
            result.append(&mut find_captured_names(argument));
            result
        }
        Expression::ReadVariable(name) => BTreeSet::from([name.clone()]),
        Expression::Lambda {
            parameter_name,
            body,
        } => {
            let mut result = find_captured_names(body);
            result.remove(&parameter_name);
            result
        }
        Expression::Construct(arguments) => {
            let mut result = BTreeSet::new();
            for argument in arguments {
                result.append(&mut find_captured_names(argument));
            }
            result
        }
    }
}

pub async fn evaluate(
    expression: &DeepExpression,
    load_value: &(dyn LoadValue + Sync),
    store_value: &(dyn StoreValue + Sync),
    read_variable: &Arc<ReadVariable>,
) -> std::result::Result<BlobDigest, StoreError> {
    match &expression.0 {
        Expression::Literal(literal_value) => Ok(literal_value.clone()),
        Expression::Apply { callee, argument } => {
            let evaluated_callee =
                Box::pin(evaluate(callee, load_value, store_value, read_variable)).await?;
            let evaluated_argument =
                Box::pin(evaluate(argument, load_value, store_value, read_variable)).await?;
            let closure = match Closure::deserialize(&evaluated_callee, load_value).await {
                Ok(success) => success,
                Err(_) => todo!(),
            };
            call_method(
                &closure.parameter_name,
                &closure.captured_variables,
                &closure.body,
                &evaluated_argument,
                load_value,
                store_value,
                read_variable,
            )
            .await
        }
        Expression::ReadVariable(name) => Ok(read_variable(&name).await),
        Expression::Lambda {
            parameter_name,
            body,
        } => {
            let mut captured_variables = BTreeMap::new();
            for captured_name in find_captured_names(body).into_iter() {
                let captured_value = read_variable(&captured_name).await;
                captured_variables.insert(captured_name, captured_value);
            }
            let closure = Closure::new(parameter_name.clone(), body.clone(), captured_variables);
            let serialized = closure.serialize(store_value).await?;
            Ok(serialized)
        }
        Expression::Construct(arguments) => {
            let mut evaluated_arguments = Vec::new();
            for argument in arguments {
                let evaluated_argument =
                    Box::pin(evaluate(argument, load_value, store_value, read_variable)).await?;
                evaluated_arguments.push(evaluated_argument);
            }
            Ok(HashedValue::from(Arc::new(Value::new(
                ValueBlob::empty(),
                evaluated_arguments,
            )))
            .digest()
            .clone())
        }
    }
}

1	use crate::name::Name;
2	use astraea::tree::{BlobDigest, HashedValue, ReferenceIndex, Value, ValueDeserializationError};
3	use astraea::{
4	storage::{LoadValue, StoreError, StoreValue},
5	tree::ValueBlob,
6	};
7	use serde::{Deserialize, Serialize};
8	use std::fmt::Display;
9	use std::future::Future;
10	use std::hash::Hash;
11	use std::{
12	collections::{BTreeMap, BTreeSet},
13	pin::Pin,
14	sync::Arc,
15	};
16
17	pub trait PrintExpression {
18	fn print(&self, writer: &mut dyn std::fmt::Write, level: usize) -> std::fmt::Result;
19	}
20
21	#[derive(Debug, PartialEq, Eq, Ord, PartialOrd, Hash, Clone, Serialize, Deserialize)]
22	pub enum Expression<E, V>
23	where
24	E: Clone + Display + PrintExpression,
25	V: Clone + Display,
26	{
27	Literal(V),
28	Apply { callee: E, argument: E },
29	ReadVariable(Name),
30	Lambda { parameter_name: Name, body: E },
31	Construct(Vec<E>),
32	}
33
34	impl<E, V> PrintExpression for Expression<E, V>
35	where
36	E: Clone + Display + PrintExpression,
37	V: Clone + Display,
38	{
39	fn print(&self, writer: &mut dyn std::fmt::Write, level: usize) -> std::fmt::Result {	31✔
40	match self {	31✔
41	Expression::Literal(literal_value) => {	5✔
42	write!(writer, "literal({})", literal_value)	5✔
43	}
44	Expression::Apply { callee, argument } => {	3✔
45	callee.print(writer, level)?;	3✔
46	write!(writer, "(")?;	3✔
47	argument.print(writer, level)?;	3✔
48	write!(writer, ")")	3✔
49	}
50	Expression::ReadVariable(name) => {	9✔
51	write!(writer, "{}", &name.key)	9✔
52	}
NEW 53	Expression::Lambda {	×
54	parameter_name,	12✔
55	body,	12✔
56	} => {	12✔
57	write!(writer, "({}) =>\n", parameter_name)?;	12✔
58	let indented = level + 1;	12✔
59	for _ in 0..(indented * 2) {	12✔
60	write!(writer, " ")?;	30✔
61	}
62	body.print(writer, indented)	12✔
63	}
64	Expression::Construct(arguments) => {	2✔
65	write!(writer, "construct(")?;	2✔
66	for argument in arguments {	8✔
67	argument.print(writer, level)?;	3✔
68	write!(writer, ", ")?;	3✔
69	}
70	write!(writer, ")")	2✔
71	}
72	}
73	}
74	}
75
76	impl<E, V> Expression<E, V>
77	where
78	E: Clone + Display + PrintExpression,
79	V: Clone + Display,
80	{
81	pub fn make_literal(value: V) -> Self {	10✔
82	Expression::Literal(value)	10✔
83	}
84
85	pub fn make_apply(callee: E, argument: E) -> Self {	10✔
86	Expression::Apply { callee, argument }
87	}
88
89	pub fn make_lambda(parameter_name: Name, body: E) -> Self {	18✔
90	Expression::Lambda {
91	parameter_name,
92	body,
93	}
94	}
95
96	pub fn make_construct(arguments: Vec<E>) -> Self {	2✔
97	Expression::Construct(arguments)	2✔
98	}
99
100	pub async fn map_child_expressions<	25✔
101	't,
102	Expr: Clone + Display + PrintExpression,
103	V2: Clone + Display,
104	Error,
105	F,
106	G,
107	>(
108	&self,
109	transform_expression: &'t F,
110	transform_value: &'t G,
111	) -> Result<Expression<Expr, V2>, Error>
112	where
113	F: Fn(&E) -> Pin<Box<dyn Future<Output = Result<Expr, Error>> + 't>>,
114	G: Fn(&V) -> Pin<Box<dyn Future<Output = Result<V2, Error>> + 't>>,
115	{
116	match self {	25✔
117	Expression::Literal(value) => Ok(Expression::Literal(transform_value(value).await?)),	16✔
118	Expression::Apply { callee, argument } => Ok(Expression::Apply {	3✔
119	callee: transform_expression(callee).await?,	3✔
120	argument: transform_expression(argument).await?,	3✔
121	}),
NEW 122	Expression::ReadVariable(name) => Ok(Expression::ReadVariable(name.clone())),	×
NEW 123	Expression::Lambda {	×
124	parameter_name,	3✔
125	body,	3✔
126	} => Ok(Expression::Lambda {	3✔
127	parameter_name: parameter_name.clone(),	3✔
128	body: transform_expression(body).await?,	3✔
129	}),
130	Expression::Construct(items) => {	3✔
131	let mut transformed_items = Vec::new();	3✔
132	for item in items.iter() {	9✔
133	transformed_items.push(transform_expression(item).await?);	6✔
134	}
135	Ok(Expression::Construct(transformed_items))	3✔
136	}
137	}
138	}
139	}
140
141	impl<E, V> Display for Expression<E, V>
142	where
143	E: Clone + Display + PrintExpression,
144	V: Clone + Display,
145	{
146	fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {	6✔
147	self.print(f, 0)	6✔
148	}
149	}
150
151	#[derive(Debug, PartialEq, Eq, Ord, PartialOrd, Hash, Clone)]
152	pub struct DeepExpression(pub Expression<Arc<DeepExpression>, BlobDigest>);
153
154	impl PrintExpression for DeepExpression {
155	fn print(&self, writer: &mut dyn std::fmt::Write, level: usize) -> std::fmt::Result {	1✔
156	self.0.print(writer, level)	1✔
157	}
158	}
159
160	impl PrintExpression for Arc<DeepExpression> {
161	fn print(&self, writer: &mut dyn std::fmt::Write, level: usize) -> std::fmt::Result {	21✔
162	self.0.print(writer, level)	21✔
163	}
164	}
165
166	impl Display for DeepExpression {
167	fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {	6✔
168	write!(f, "{}", self.0)	6✔
169	}
170	}
171
172	pub type ShallowExpression = Expression<BlobDigest, BlobDigest>;
173
174	impl PrintExpression for BlobDigest {
NEW 175	fn print(&self, writer: &mut dyn std::fmt::Write, _level: usize) -> std::fmt::Result {	×
NEW 176	write!(writer, "{}", self)	×
177	}
178	}
179
180	pub type ReferenceExpression = Expression<ReferenceIndex, ReferenceIndex>;
181
182	impl PrintExpression for ReferenceIndex {
NEW 183	fn print(&self, writer: &mut dyn std::fmt::Write, _level: usize) -> std::fmt::Result {	×
NEW 184	write!(writer, "{}", self)	×
185	}
186	}
187
188	pub fn to_reference_expression(	9✔
189	expression: &ShallowExpression,
190	) -> (ReferenceExpression, Vec<BlobDigest>) {
191	match expression {	9✔
192	Expression::Literal(value) => (	6✔
193	ReferenceExpression::Literal(ReferenceIndex(0)),	6✔
194	vec![*value],	6✔
195	),
196	Expression::Apply { callee, argument } => (	1✔
197	ReferenceExpression::Apply {	1✔
198	callee: ReferenceIndex(0),	1✔
199	argument: ReferenceIndex(1),	1✔
200	},
201	// TODO: deduplicate?
202	vec![callee, argument],	1✔
203	),
NEW 204	Expression::ReadVariable(name) => (ReferenceExpression::ReadVariable(name.clone()), vec![]),	×
205	Expression::Lambda {
206	parameter_name,	1✔
207	body,	1✔
208	} => (	1✔
209	ReferenceExpression::Lambda {	1✔
210	parameter_name: parameter_name.clone(),	1✔
211	body: ReferenceIndex(0),	1✔
212	},
213	vec![*body],	1✔
214	),
215	Expression::Construct(items) => (	1✔
216	ReferenceExpression::Construct(	1✔
217	(0..items.len())	1✔
218	.map(\|index\| ReferenceIndex(index as u64))	4✔
219	.collect(),	1✔
220	),
221	// TODO: deduplicate?
222	items.clone(),	1✔
223	),
224	}
225	}
226
227	pub async fn deserialize_shallow(value: &Value) -> Result<ShallowExpression, ()> {	16✔
228	let reference_expression: ReferenceExpression = postcard::from_bytes(value.blob().as_slice())	8✔
229	.unwrap(/TODO/);
230	reference_expression	8✔
231	.map_child_expressions(
232	&\|child: &ReferenceIndex\| -> Pin<Box<dyn Future<Output = Result<BlobDigest, ()>>>> {	13✔
233	let child = value.references()[child.0 as usize].clone();	5✔
234	Box::pin(async move { Ok(child) })	15✔
235	},
236	&\|child: &ReferenceIndex\| -> Pin<Box<dyn Future<Output = Result<BlobDigest, ()>>>> {	13✔
237	let child = value.references()[child.0 as usize].clone();	5✔
238	Box::pin(async move { Ok(child) })	15✔
239	},
240	)
241	.await	8✔
242	}
243
244	pub async fn deserialize_recursively(	8✔
245	root: &BlobDigest,
246	load_value: &(dyn LoadValue + Sync),
247	) -> Result<DeepExpression, ()> {
248	let root_loaded = load_value.load_value(root).await.unwrap(/TODO/).hash().unwrap(/TODO/);	24✔
249	let shallow = deserialize_shallow(&root_loaded.value()).await?;	16✔
250	let deep = shallow	8✔
251	.map_child_expressions(
252	&\|child: &BlobDigest\| -> Pin<Box<dyn Future<Output = Result<Arc<DeepExpression>, ()>>>> {	5✔
253	let child = child.clone();	5✔
254	Box::pin(async move { deserialize_recursively(&child, load_value)	10✔
255	.await	5✔
256	.map(\|success\| Arc::new(success)) })	15✔
257	},
258	&\|child: &BlobDigest\| -> Pin<Box<dyn Future<Output = Result<BlobDigest, ()>>>> {	5✔
259	let child = child.clone();	5✔
260	Box::pin(async move { Ok(child) })	15✔
261	},
262	)
NEW 263	.await?;	×
264	Ok(DeepExpression(deep))
265	}
266
267	pub fn expression_to_value(expression: &ShallowExpression) -> Value {	9✔
268	let (reference_expression, references) = to_reference_expression(expression);	9✔
269	let blob = postcard::to_allocvec(&reference_expression).unwrap(/TODO/);	9✔
270	Value::new(
271	ValueBlob::try_from(bytes::Bytes::from_owner(blob)).unwrap(/TODO/),	9✔
272	references,	9✔
273	)
274	}
275
276	pub async fn serialize_shallow(	9✔
277	expression: &ShallowExpression,
278	storage: &(dyn StoreValue + Sync),
279	) -> std::result::Result<BlobDigest, StoreError> {
280	let value = expression_to_value(expression);	9✔
281	storage	9✔
282	.store_value(&HashedValue::from(Arc::new(value)))	9✔
283	.await	9✔
284	}
285
286	pub async fn serialize_recursively(	9✔
287	expression: &DeepExpression,
288	storage: &(dyn StoreValue + Sync),
289	) -> std::result::Result<BlobDigest, StoreError> {
290	let shallow_expression: ShallowExpression = expression	18✔
291	.0	9✔
292	.map_child_expressions(&\|child: &Arc<DeepExpression>\| -> Pin<	9✔
293	Box<dyn Future<Output = Result<BlobDigest, StoreError>>>,
294	> {	5✔
295	let child = child.clone();	5✔
296	Box::pin(async move {	10✔
297	serialize_recursively(&child, storage)	5✔
298	.await	5✔
299	})
300	},&\|child: &BlobDigest\| -> Pin<	14✔
301	Box<dyn Future<Output = Result<BlobDigest, StoreError>>>,
302	> {	6✔
303	let child = child.clone();	6✔
304	Box::pin(async move {	12✔
305	Ok(child)	6✔
306	})
307	})
308	.await?;	9✔
309	serialize_shallow(&shallow_expression, storage).await
310	}
311
312	#[derive(Debug)]
313	pub struct Closure {
314	parameter_name: Name,
315	body: Arc<DeepExpression>,
316	captured_variables: BTreeMap<Name, BlobDigest>,
317	}
318
319	#[derive(Debug, Serialize, Deserialize)]
320	pub struct ClosureBlob {
321	parameter_name: Name,
322	captured_variables: BTreeMap<Name, ReferenceIndex>,
323	}
324
325	impl ClosureBlob {
326	pub fn new(parameter_name: Name, captured_variables: BTreeMap<Name, ReferenceIndex>) -> Self {	3✔
327	Self {
328	parameter_name,
329	captured_variables,
330	}
331	}
332	}
333
334	impl Closure {
335	pub fn new(	5✔
336	parameter_name: Name,
337	body: Arc<DeepExpression>,
338	captured_variables: BTreeMap<Name, BlobDigest>,
339	) -> Self {
340	Self {
341	parameter_name,
342	body,
343	captured_variables,
344	}
345	}
346
347	pub async fn serialize(	3✔
348	&self,
349	store_value: &(dyn StoreValue + Sync),
350	) -> Result<BlobDigest, StoreError> {
351	let mut references = vec![serialize_recursively(&self.body, store_value).await?];	6✔
352	let mut captured_variables = BTreeMap::new();
NEW 353	for (name, reference) in self.captured_variables.iter() {	×
354	let index = ReferenceIndex(references.len() as u64);
355	captured_variables.insert(name.clone(), index);
356	references.push(reference.clone());
357	}
358	let closure_blob = ClosureBlob::new(self.parameter_name.clone(), captured_variables);
359	let closure_blob_bytes = postcard::to_allocvec(&closure_blob).unwrap(/TODO/);
360	store_value
361	.store_value(&HashedValue::from(Arc::new(Value::new(
362	ValueBlob::try_from(bytes::Bytes::from_owner(closure_blob_bytes)).unwrap(/TODO/),
363	references,
364	))))
365	.await
366	}
367
368	pub async fn deserialize(	2✔
369	root: &BlobDigest,
370	load_value: &(dyn LoadValue + Sync),
371	) -> Result<Closure, ValueDeserializationError> {
372	let loaded_root = match load_value.load_value(root).await {	4✔
373	Some(success) => success,	2✔
NEW 374	None => return Err(ValueDeserializationError::BlobUnavailable(root.clone())),	×
375	};
376	let root_value = loaded_root.hash().unwrap(/TODO/).value().clone();	2✔
377	let closure_blob: ClosureBlob = match postcard::from_bytes(&root_value.blob().as_slice()) {	4✔
378	Ok(success) => success,
NEW 379	Err(error) => return Err(ValueDeserializationError::Postcard(error)),	×
380	};
381	let body_reference = &root_value.references()[0];
382	let body = deserialize_recursively(body_reference, load_value).await.unwrap(/TODO/);	4✔
383	let mut captured_variables = BTreeMap::new();	2✔
384	for (name, index) in closure_blob.captured_variables {	2✔
385	let reference = &root_value.references()[index.0 as usize];
386	captured_variables.insert(name, reference.clone());
387	}
388	Ok(Closure::new(	2✔
389	closure_blob.parameter_name,	2✔
390	Arc::new(body),	2✔
391	captured_variables,	2✔
392	))
393	}
394	}
395
396	async fn call_method(	2✔
397	parameter_name: &Name,
398	captured_variables: &BTreeMap<Name, BlobDigest>,
399	body: &DeepExpression,
400	argument: &BlobDigest,
401	load_value: &(dyn LoadValue + Sync),
402	store_value: &(dyn StoreValue + Sync),
403	read_variable: &Arc<ReadVariable>,
404	) -> std::result::Result<BlobDigest, StoreError> {
405	let read_variable_in_body: Arc<ReadVariable> = Arc::new({	2✔
406	let parameter_name = parameter_name.clone();	2✔
407	let argument = argument.clone();	2✔
408	let captured_variables = captured_variables.clone();	2✔
409	let read_variable = read_variable.clone();	2✔
410	move \|name: &Name\| -> Pin<Box<dyn core::future::Future<Output = BlobDigest> + Send>> {	2✔
NEW 411	if name == &parameter_name {	×
NEW 412	let argument = argument.clone();	×
NEW 413	Box::pin(core::future::ready(argument))	×
NEW 414	} else if let Some(found) = captured_variables.get(name) {	×
415	Box::pin(core::future::ready(found.clone()))
416	} else {
NEW 417	read_variable(name)	×
418	}
419	}
420	});
421	Box::pin(evaluate(	2✔
422	&body,	2✔
423	load_value,	2✔
424	store_value,	2✔
425	&read_variable_in_body,	2✔
426	))
427	.await	2✔
428	}
429
430	pub type ReadVariable =
431	dyn Fn(&Name) -> Pin<Box<dyn core::future::Future<Output = BlobDigest> + Send>> + Send + Sync;
432
433	fn find_captured_names(expression: &DeepExpression) -> BTreeSet<Name> {	6✔
434	match &expression.0 {	6✔
435	Expression::Literal(_blob_digest) => BTreeSet::new(),	4✔
NEW 436	Expression::Apply { callee, argument } => {	×
NEW 437	let mut result = find_captured_names(callee);	×
NEW 438	result.append(&mut find_captured_names(argument));	×
NEW 439	result	×
440	}
NEW 441	Expression::ReadVariable(name) => BTreeSet::from([name.clone()]),	×
442	Expression::Lambda {
443	parameter_name,	1✔
444	body,	1✔
445	} => {	1✔
446	let mut result = find_captured_names(body);	1✔
447	result.remove(&parameter_name);	1✔
448	result	1✔
449	}
450	Expression::Construct(arguments) => {	1✔
451	let mut result = BTreeSet::new();	1✔
452	for argument in arguments {	5✔
453	result.append(&mut find_captured_names(argument));
454	}
455	result	1✔
456	}
457	}
458	}
459
460	pub async fn evaluate(	12✔
461	expression: &DeepExpression,
462	load_value: &(dyn LoadValue + Sync),
463	store_value: &(dyn StoreValue + Sync),
464	read_variable: &Arc<ReadVariable>,
465	) -> std::result::Result<BlobDigest, StoreError> {
466	match &expression.0 {	12✔
467	Expression::Literal(literal_value) => Ok(literal_value.clone()),	6✔
468	Expression::Apply { callee, argument } => {	2✔
469	let evaluated_callee =	2✔
470	Box::pin(evaluate(callee, load_value, store_value, read_variable)).await?;	2✔
471	let evaluated_argument =	2✔
NEW 472	Box::pin(evaluate(argument, load_value, store_value, read_variable)).await?;	×
473	let closure = match Closure::deserialize(&evaluated_callee, load_value).await {	2✔
474	Ok(success) => success,	2✔
475	Err(_) => todo!(),
476	};
477	call_method(
478	&closure.parameter_name,	2✔
479	&closure.captured_variables,	2✔
480	&closure.body,	2✔
481	&evaluated_argument,	2✔
482	load_value,	2✔
483	store_value,	2✔
484	read_variable,	2✔
485	)
486	.await	2✔
487	}
NEW 488	Expression::ReadVariable(name) => Ok(read_variable(&name).await),	×
489	Expression::Lambda {
490	parameter_name,	3✔
491	body,	3✔
492	} => {	3✔
493	let mut captured_variables = BTreeMap::new();	3✔
494	for captured_name in find_captured_names(body).into_iter() {	3✔
495	let captured_value = read_variable(&captured_name).await;	×
496	captured_variables.insert(captured_name, captured_value);
497	}
498	let closure = Closure::new(parameter_name.clone(), body.clone(), captured_variables);	3✔
499	let serialized = closure.serialize(store_value).await?;	3✔
500	Ok(serialized)
501	}
502	Expression::Construct(arguments) => {	1✔
503	let mut evaluated_arguments = Vec::new();	1✔
504	for argument in arguments {	5✔
505	let evaluated_argument =	2✔
506	Box::pin(evaluate(argument, load_value, store_value, read_variable)).await?;	2✔
507	evaluated_arguments.push(evaluated_argument);
508	}
509	Ok(HashedValue::from(Arc::new(Value::new(	1✔
510	ValueBlob::empty(),	1✔
511	evaluated_arguments,	1✔
512	)))
513	.digest()	1✔
514	.clone())	1✔
515	}
516	}
517	}

TyRoXx / NonlocalityOS / 14776866710

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