diff options
Diffstat (limited to 'dhall/src/syntax/core')
-rw-r--r-- | dhall/src/syntax/core/context.rs | 80 | ||||
-rw-r--r-- | dhall/src/syntax/core/expr.rs | 377 | ||||
-rw-r--r-- | dhall/src/syntax/core/import.rs | 130 | ||||
-rw-r--r-- | dhall/src/syntax/core/label.rs | 34 | ||||
-rw-r--r-- | dhall/src/syntax/core/map.rs | 394 | ||||
-rw-r--r-- | dhall/src/syntax/core/mod.rs | 13 | ||||
-rw-r--r-- | dhall/src/syntax/core/span.rs | 81 | ||||
-rw-r--r-- | dhall/src/syntax/core/text.rs | 181 | ||||
-rw-r--r-- | dhall/src/syntax/core/visitor.rs | 360 |
9 files changed, 0 insertions, 1650 deletions
diff --git a/dhall/src/syntax/core/context.rs b/dhall/src/syntax/core/context.rs deleted file mode 100644 index 6844baa..0000000 --- a/dhall/src/syntax/core/context.rs +++ /dev/null @@ -1,80 +0,0 @@ -use std::cmp::Eq; -use std::collections::HashMap; -use std::hash::Hash; - -/// A `(Context a)` associates `Text` labels with values of type `a` -/// -/// The `Context` is used for type-checking when `(a = Expr)` -/// -/// * You create a `Context` using `empty` and `insert` -/// * You transform a `Context` using `fmap` -/// * You consume a `Context` using `lookup` and `toList` -/// -/// The difference between a `Context` and a `Map` is that a `Context` lets you -/// have multiple ordered occurrences of the same key and you can query for the -/// `n`th occurrence of a given key. -/// -#[derive(Debug, Clone)] -pub struct Context<K: Eq + Hash, T>(HashMap<K, Vec<T>>); - -impl<K: Hash + Eq + Clone, T> Context<K, T> { - /// An empty context with no key-value pairs - pub fn new() -> Self { - Context(HashMap::new()) - } - - /// Look up a key by name and index - /// - /// ```c - /// lookup _ _ empty = Nothing - /// lookup k 0 (insert k v c) = Just v - /// lookup k n (insert k v c) = lookup k (n - 1) c -- 1 <= n - /// lookup k n (insert j v c) = lookup k n c -- k /= j - /// ``` - pub fn lookup<'a>(&'a self, k: &K, n: usize) -> Option<&'a T> { - self.0.get(k).and_then(|v| { - if n < v.len() { - v.get(v.len() - 1 - n) - } else { - None - } - }) - } - - pub fn map<U, F: Fn(&K, &T) -> U>(&self, f: F) -> Context<K, U> { - Context( - self.0 - .iter() - .map(|(k, vs)| { - ((*k).clone(), vs.iter().map(|v| f(k, v)).collect()) - }) - .collect(), - ) - } - - pub fn lookup_all<'a>(&'a self, k: &K) -> impl Iterator<Item = &T> { - self.0.get(k).into_iter().flat_map(|v| v.iter()) - } - - pub fn iter(&self) -> impl Iterator<Item = (&K, &T)> { - self.0 - .iter() - .flat_map(|(k, vs)| vs.iter().map(move |v| (k, v))) - } - - pub fn iter_keys(&self) -> impl Iterator<Item = (&K, &Vec<T>)> { - self.0.iter() - } -} - -impl<K: Hash + Eq + Clone, T: Clone> Context<K, T> { - /// Add a key-value pair to the `Context` - pub fn insert(&self, k: K, v: T) -> Self { - let mut ctx = (*self).clone(); - { - let m = ctx.0.entry(k).or_insert_with(Vec::new); - m.push(v); - } - ctx - } -} diff --git a/dhall/src/syntax/core/expr.rs b/dhall/src/syntax/core/expr.rs deleted file mode 100644 index 5b9f401..0000000 --- a/dhall/src/syntax/core/expr.rs +++ /dev/null @@ -1,377 +0,0 @@ -use crate::syntax::map::{DupTreeMap, DupTreeSet}; -use crate::syntax::visitor::{self, ExprFMutVisitor, ExprFVisitor}; -use crate::syntax::*; - -pub type Integer = isize; -pub type Natural = usize; -pub type Double = NaiveDouble; - -pub fn trivial_result<T>(x: Result<T, !>) -> T { - match x { - Ok(x) => x, - Err(e) => e, - } -} - -/// Double with bitwise equality -#[derive(Debug, Copy, Clone)] -pub struct NaiveDouble(f64); - -impl PartialEq for NaiveDouble { - fn eq(&self, other: &Self) -> bool { - self.0.to_bits() == other.0.to_bits() - } -} - -impl Eq for NaiveDouble {} - -impl std::hash::Hash for NaiveDouble { - fn hash<H>(&self, state: &mut H) - where - H: std::hash::Hasher, - { - self.0.to_bits().hash(state) - } -} - -impl From<f64> for NaiveDouble { - fn from(x: f64) -> Self { - NaiveDouble(x) - } -} - -impl From<NaiveDouble> for f64 { - fn from(x: NaiveDouble) -> f64 { - x.0 - } -} - -/// Constants for a pure type system -#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)] -pub enum Const { - Type, - Kind, - Sort, -} - -/// Bound variable -/// -/// The `Label` field is the variable's name (i.e. \"`x`\"). -/// The `Int` field is a DeBruijn index. -/// See dhall-lang/standard/semantics.md for details -#[derive(Debug, Clone, PartialEq, Eq, Hash)] -pub struct V<Label>(pub Label, pub usize); - -// This is only for the specific `Label` type, not generic -impl From<Label> for V<Label> { - fn from(x: Label) -> V<Label> { - V(x, 0) - } -} -impl<'a> From<&'a Label> for V<Label> { - fn from(x: &'a Label) -> V<Label> { - V(x.clone(), 0) - } -} - -// Definition order must match precedence order for -// pretty-printing to work correctly -#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)] -pub enum BinOp { - /// `x ? y` - ImportAlt, - /// `x || y` - BoolOr, - /// `x + y` - NaturalPlus, - /// `x ++ y` - TextAppend, - /// `x # y` - ListAppend, - /// `x && y` - BoolAnd, - /// `x ∧ y` - RecursiveRecordMerge, - /// `x ⫽ y` - RightBiasedRecordMerge, - /// `x ⩓ y` - RecursiveRecordTypeMerge, - /// `x * y` - NaturalTimes, - /// `x == y` - BoolEQ, - /// `x != y` - BoolNE, - /// x === y - Equivalence, -} - -/// Built-ins -#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)] -pub enum Builtin { - Bool, - Natural, - Integer, - Double, - Text, - List, - Optional, - OptionalNone, - NaturalBuild, - NaturalFold, - NaturalIsZero, - NaturalEven, - NaturalOdd, - NaturalToInteger, - NaturalShow, - NaturalSubtract, - IntegerToDouble, - IntegerShow, - DoubleShow, - ListBuild, - ListFold, - ListLength, - ListHead, - ListLast, - ListIndexed, - ListReverse, - OptionalFold, - OptionalBuild, - TextShow, -} - -// Each node carries an annotation. -#[derive(Debug, Clone)] -pub struct Expr<Embed>(Box<(RawExpr<Embed>, Span)>); - -pub type RawExpr<Embed> = ExprF<Expr<Embed>, Embed>; - -impl<Embed: PartialEq> std::cmp::PartialEq for Expr<Embed> { - fn eq(&self, other: &Self) -> bool { - self.0.as_ref().0 == other.0.as_ref().0 - } -} - -impl<Embed: Eq> std::cmp::Eq for Expr<Embed> {} - -impl<Embed: std::hash::Hash> std::hash::Hash for Expr<Embed> { - fn hash<H>(&self, state: &mut H) - where - H: std::hash::Hasher, - { - (self.0).0.hash(state) - } -} - -/// Syntax tree for expressions -// Having the recursion out of the enum definition enables writing -// much more generic code and improves pattern-matching behind -// smart pointers. -#[derive(Debug, Clone, PartialEq, Eq, Hash)] -pub enum ExprF<SubExpr, Embed> { - Const(Const), - /// `x` - /// `x@n` - Var(V<Label>), - /// `λ(x : A) -> b` - Lam(Label, SubExpr, SubExpr), - /// `A -> B` - /// `∀(x : A) -> B` - Pi(Label, SubExpr, SubExpr), - /// `f a` - App(SubExpr, SubExpr), - /// `let x = r in e` - /// `let x : t = r in e` - Let(Label, Option<SubExpr>, SubExpr, SubExpr), - /// `x : t` - Annot(SubExpr, SubExpr), - /// `assert : t` - Assert(SubExpr), - /// Built-in values - Builtin(Builtin), - // Binary operations - BinOp(BinOp, SubExpr, SubExpr), - /// `True` - BoolLit(bool), - /// `if x then y else z` - BoolIf(SubExpr, SubExpr, SubExpr), - /// `1` - NaturalLit(Natural), - /// `+2` - IntegerLit(Integer), - /// `3.24` - DoubleLit(Double), - /// `"Some ${interpolated} text"` - TextLit(InterpolatedText<SubExpr>), - /// `[] : t` - EmptyListLit(SubExpr), - /// `[x, y, z]` - NEListLit(Vec<SubExpr>), - /// `Some e` - SomeLit(SubExpr), - /// `{ k1 : t1, k2 : t1 }` - RecordType(DupTreeMap<Label, SubExpr>), - /// `{ k1 = v1, k2 = v2 }` - RecordLit(DupTreeMap<Label, SubExpr>), - /// `< k1 : t1, k2 >` - UnionType(DupTreeMap<Label, Option<SubExpr>>), - /// `merge x y : t` - Merge(SubExpr, SubExpr, Option<SubExpr>), - /// `toMap x : t` - ToMap(SubExpr, Option<SubExpr>), - /// `e.x` - Field(SubExpr, Label), - /// `e.{ x, y, z }` - Projection(SubExpr, DupTreeSet<Label>), - /// `e.(t)` - ProjectionByExpr(SubExpr, SubExpr), - /// `./some/path` - Import(Import<SubExpr>), - /// Embeds the result of resolving an import - Embed(Embed), -} - -impl<SE, E> ExprF<SE, E> { - pub fn traverse_ref_with_special_handling_of_binders<'a, SE2, Err>( - &'a self, - visit_subexpr: impl FnMut(&'a SE) -> Result<SE2, Err>, - visit_under_binder: impl FnOnce(&'a Label, &'a SE) -> Result<SE2, Err>, - ) -> Result<ExprF<SE2, E>, Err> - where - E: Clone, - { - visitor::TraverseRefWithBindersVisitor { - visit_subexpr, - visit_under_binder, - } - .visit(self) - } - - fn traverse_ref<'a, SE2, Err>( - &'a self, - visit_subexpr: impl FnMut(&'a SE) -> Result<SE2, Err>, - ) -> Result<ExprF<SE2, E>, Err> - where - E: Clone, - { - visitor::TraverseRefVisitor { visit_subexpr }.visit(self) - } - - fn traverse_mut<'a, Err>( - &'a mut self, - visit_subexpr: impl FnMut(&'a mut SE) -> Result<(), Err>, - ) -> Result<(), Err> { - visitor::TraverseMutVisitor { visit_subexpr }.visit(self) - } - - pub fn map_ref_with_special_handling_of_binders<'a, SE2>( - &'a self, - mut map_subexpr: impl FnMut(&'a SE) -> SE2, - mut map_under_binder: impl FnMut(&'a Label, &'a SE) -> SE2, - ) -> ExprF<SE2, E> - where - E: Clone, - { - trivial_result(self.traverse_ref_with_special_handling_of_binders( - |x| Ok(map_subexpr(x)), - |l, x| Ok(map_under_binder(l, x)), - )) - } - - pub fn map_ref<'a, SE2>( - &'a self, - mut map_subexpr: impl FnMut(&'a SE) -> SE2, - ) -> ExprF<SE2, E> - where - E: Clone, - { - trivial_result(self.traverse_ref(|x| Ok(map_subexpr(x)))) - } - - pub fn map_mut<'a>(&'a mut self, mut map_subexpr: impl FnMut(&'a mut SE)) { - trivial_result(self.traverse_mut(|x| Ok(map_subexpr(x)))) - } -} - -impl<E> Expr<E> { - pub fn as_ref(&self) -> &RawExpr<E> { - &self.0.as_ref().0 - } - pub fn as_mut(&mut self) -> &mut RawExpr<E> { - &mut self.0.as_mut().0 - } - pub fn span(&self) -> Span { - self.0.as_ref().1.clone() - } - - pub fn new(x: RawExpr<E>, n: Span) -> Self { - Expr(Box::new((x, n))) - } - - pub fn rewrap<E2>(&self, x: RawExpr<E2>) -> Expr<E2> { - Expr(Box::new((x, (self.0).1.clone()))) - } - - pub fn traverse_resolve_mut<Err, F1>( - &mut self, - f: &mut F1, - ) -> Result<(), Err> - where - E: Clone, - F1: FnMut(Import<Expr<E>>) -> Result<E, Err>, - { - match self.as_mut() { - ExprF::BinOp(BinOp::ImportAlt, l, r) => { - let garbage_expr = ExprF::BoolLit(false); - let new_self = if l.traverse_resolve_mut(f).is_ok() { - l - } else { - r.traverse_resolve_mut(f)?; - r - }; - *self.as_mut() = - std::mem::replace(new_self.as_mut(), garbage_expr); - } - _ => { - self.as_mut().traverse_mut(|e| e.traverse_resolve_mut(f))?; - if let ExprF::Import(import) = self.as_mut() { - let garbage_import = Import { - mode: ImportMode::Code, - location: ImportLocation::Missing, - hash: None, - }; - // Move out of &mut import - let import = std::mem::replace(import, garbage_import); - *self.as_mut() = ExprF::Embed(f(import)?); - } - } - } - Ok(()) - } -} - -/// Add an isize to an usize -/// Returns `None` on over/underflow -fn add_ui(u: usize, i: isize) -> Option<usize> { - Some(if i < 0 { - u.checked_sub(i.checked_neg()? as usize)? - } else { - u.checked_add(i as usize)? - }) -} - -impl<Label: PartialEq + Clone> V<Label> { - pub fn shift(&self, delta: isize, var: &V<Label>) -> Option<Self> { - let V(x, n) = var; - let V(y, m) = self; - Some(if x == y && n <= m { - V(y.clone(), add_ui(*m, delta)?) - } else { - V(y.clone(), *m) - }) - } - - pub fn over_binder(&self, x: &Label) -> Option<Self> { - self.shift(-1, &V(x.clone(), 0)) - } -} diff --git a/dhall/src/syntax/core/import.rs b/dhall/src/syntax/core/import.rs deleted file mode 100644 index da3e99b..0000000 --- a/dhall/src/syntax/core/import.rs +++ /dev/null @@ -1,130 +0,0 @@ -/// The beginning of a file path which anchors subsequent path components -#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)] -pub enum FilePrefix { - /// Absolute path - Absolute, - /// Path relative to . - Here, - /// Path relative to .. - Parent, - /// Path relative to ~ - Home, -} - -#[derive(Debug, Clone, PartialEq, Eq, Hash)] -pub struct FilePath { - pub file_path: Vec<String>, -} - -/// The location of import (i.e. local vs. remote vs. environment) -#[derive(Debug, Clone, PartialEq, Eq, Hash)] -pub enum ImportLocation<SubExpr> { - Local(FilePrefix, FilePath), - Remote(URL<SubExpr>), - Env(String), - Missing, -} - -#[derive(Debug, Clone, PartialEq, Eq, Hash)] -pub struct URL<SubExpr> { - pub scheme: Scheme, - pub authority: String, - pub path: FilePath, - pub query: Option<String>, - pub headers: Option<SubExpr>, -} - -#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)] -pub enum Scheme { - HTTP, - HTTPS, -} - -/// How to interpret the import's contents (i.e. as Dhall code or raw text) -#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)] -pub enum ImportMode { - Code, - RawText, - Location, -} - -#[derive(Debug, Clone, PartialEq, Eq, Hash)] -pub enum Hash { - SHA256(Vec<u8>), -} - -/// Reference to an external resource -#[derive(Debug, Clone, PartialEq, Eq, Hash)] -pub struct Import<SubExpr> { - pub mode: ImportMode, - pub location: ImportLocation<SubExpr>, - pub hash: Option<Hash>, -} - -impl<SE> URL<SE> { - pub fn traverse_ref<'a, Err, SE2>( - &'a self, - f: impl FnOnce(&'a SE) -> Result<SE2, Err>, - ) -> Result<URL<SE2>, Err> { - let headers = self.headers.as_ref().map(f).transpose()?; - Ok(URL { - scheme: self.scheme, - authority: self.authority.clone(), - path: self.path.clone(), - query: self.query.clone(), - headers, - }) - } - pub fn traverse_mut<'a, Err>( - &'a mut self, - f: impl FnOnce(&'a mut SE) -> Result<(), Err>, - ) -> Result<(), Err> { - if let Some(header) = &mut self.headers { - f(header)?; - } - Ok(()) - } -} - -impl<SE> ImportLocation<SE> { - pub fn traverse_ref<'a, Err, SE2>( - &'a self, - f: impl FnOnce(&'a SE) -> Result<SE2, Err>, - ) -> Result<ImportLocation<SE2>, Err> { - use ImportLocation::*; - Ok(match self { - Local(prefix, path) => Local(*prefix, path.clone()), - Remote(url) => Remote(url.traverse_ref(f)?), - Env(env) => Env(env.clone()), - Missing => Missing, - }) - } - pub fn traverse_mut<'a, Err>( - &'a mut self, - f: impl FnOnce(&'a mut SE) -> Result<(), Err>, - ) -> Result<(), Err> { - if let ImportLocation::Remote(url) = self { - url.traverse_mut(f)?; - } - Ok(()) - } -} - -impl<SE> Import<SE> { - pub fn traverse_ref<'a, Err, SE2>( - &'a self, - f: impl FnOnce(&'a SE) -> Result<SE2, Err>, - ) -> Result<Import<SE2>, Err> { - Ok(Import { - mode: self.mode, - location: self.location.traverse_ref(f)?, - hash: self.hash.clone(), - }) - } - pub fn traverse_mut<'a, Err>( - &'a mut self, - f: impl FnOnce(&'a mut SE) -> Result<(), Err>, - ) -> Result<(), Err> { - self.location.traverse_mut(f) - } -} diff --git a/dhall/src/syntax/core/label.rs b/dhall/src/syntax/core/label.rs deleted file mode 100644 index 43c3f53..0000000 --- a/dhall/src/syntax/core/label.rs +++ /dev/null @@ -1,34 +0,0 @@ -use std::rc::Rc; - -// The type for labels throughout the AST -// It owns the data because otherwise lifetimes would make recursive imports impossible -#[derive(Debug, Clone, PartialEq, Eq, Hash, PartialOrd, Ord)] -pub struct Label(Rc<str>); - -impl From<String> for Label { - fn from(s: String) -> Self { - let s: &str = &s; - Label(s.into()) - } -} - -impl<'a> From<&'a str> for Label { - fn from(s: &'a str) -> Self { - Label(Rc::from(s)) - } -} - -impl From<&Label> for String { - fn from(x: &Label) -> String { - x.0.as_ref().to_owned() - } -} - -impl Label { - pub fn from_str(s: &str) -> Label { - Label(s.into()) - } - pub fn as_ref(&self) -> &str { - self.0.as_ref() - } -} diff --git a/dhall/src/syntax/core/map.rs b/dhall/src/syntax/core/map.rs deleted file mode 100644 index c4c6126..0000000 --- a/dhall/src/syntax/core/map.rs +++ /dev/null @@ -1,394 +0,0 @@ -/// A sorted map that allows multiple values for each key. -pub use dup_tree_map::DupTreeMap; -pub use dup_tree_set::DupTreeSet; - -mod one_or_more { - use either::Either; - use std::{iter, slice, vec}; - - #[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)] - pub enum OneOrMore<T> { - One(T), - More(Vec<T>), - } - - pub type Iter<'a, T> = Either<slice::Iter<'a, T>, iter::Once<&'a T>>; - pub type IterMut<'a, T> = - Either<slice::IterMut<'a, T>, iter::Once<&'a mut T>>; - pub type IntoIter<T> = Either<vec::IntoIter<T>, iter::Once<T>>; - - impl<T> OneOrMore<T> { - pub fn new(x: T) -> Self { - OneOrMore::One(x) - } - - pub fn push(&mut self, x: T) { - take_mut::take(self, |sef| match sef { - OneOrMore::More(mut vec) => { - vec.push(x); - OneOrMore::More(vec) - } - OneOrMore::One(one) => OneOrMore::More(vec![one, x]), - }) - } - - pub fn iter(&self) -> Iter<'_, T> { - match self { - OneOrMore::More(vec) => Either::Left(vec.iter()), - OneOrMore::One(x) => Either::Right(iter::once(x)), - } - } - - pub fn iter_mut(&mut self) -> IterMut<'_, T> { - match self { - OneOrMore::More(vec) => Either::Left(vec.iter_mut()), - OneOrMore::One(x) => Either::Right(iter::once(x)), - } - } - } - - impl<T> IntoIterator for OneOrMore<T> { - type Item = T; - type IntoIter = IntoIter<T>; - - fn into_iter(self) -> Self::IntoIter { - match self { - OneOrMore::More(vec) => Either::Left(vec.into_iter()), - OneOrMore::One(x) => Either::Right(iter::once(x)), - } - } - } -} - -mod dup_tree_map { - use super::one_or_more; - use super::one_or_more::OneOrMore; - use std::collections::{btree_map, BTreeMap}; - use std::iter; - - #[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)] - pub struct DupTreeMap<K, V> { - map: BTreeMap<K, OneOrMore<V>>, - size: usize, - } - - pub type IterInternalIntermediate<'a, K, V> = - iter::Zip<iter::Repeat<&'a K>, one_or_more::Iter<'a, V>>; - pub type IterInternal<'a, K, V> = iter::FlatMap< - btree_map::Iter<'a, K, OneOrMore<V>>, - IterInternalIntermediate<'a, K, V>, - for<'b> fn( - (&'b K, &'b OneOrMore<V>), - ) -> IterInternalIntermediate<'b, K, V>, - >; - pub struct Iter<'a, K, V> { - iter: IterInternal<'a, K, V>, - size: usize, - } - pub type IterMutInternalIntermediate<'a, K, V> = - iter::Zip<iter::Repeat<&'a K>, one_or_more::IterMut<'a, V>>; - pub type IterMutInternal<'a, K, V> = iter::FlatMap< - btree_map::IterMut<'a, K, OneOrMore<V>>, - IterMutInternalIntermediate<'a, K, V>, - for<'b> fn( - (&'b K, &'b mut OneOrMore<V>), - ) -> IterMutInternalIntermediate<'b, K, V>, - >; - pub struct IterMut<'a, K, V> { - iter: IterMutInternal<'a, K, V>, - size: usize, - } - pub type IntoIterInternalIntermediate<K, V> = - iter::Zip<iter::Repeat<K>, one_or_more::IntoIter<V>>; - pub type IntoIterInternal<K, V> = iter::FlatMap< - btree_map::IntoIter<K, OneOrMore<V>>, - IntoIterInternalIntermediate<K, V>, - fn((K, OneOrMore<V>)) -> IntoIterInternalIntermediate<K, V>, - >; - pub struct IntoIter<K: Clone, V> { - iter: IntoIterInternal<K, V>, - size: usize, - } - - impl<K, V> DupTreeMap<K, V> { - pub fn new() -> Self - where - K: Ord, - { - DupTreeMap { - map: BTreeMap::new(), - size: 0, - } - } - - pub fn insert(&mut self, key: K, value: V) - where - K: Ord, - { - use std::collections::btree_map::Entry; - match self.map.entry(key) { - Entry::Vacant(e) => { - e.insert(OneOrMore::new(value)); - } - Entry::Occupied(mut e) => e.get_mut().push(value), - } - self.size += 1; - } - - pub fn len(&self) -> usize { - self.size - } - pub fn is_empty(&self) -> bool { - self.size == 0 - } - - pub fn iter(&self) -> Iter<'_, K, V> - where - K: Ord, - { - fn foo<'a, K, V>( - (k, oom): (&'a K, &'a OneOrMore<V>), - ) -> IterInternalIntermediate<'a, K, V> { - iter::repeat(k).zip(oom.iter()) - } - Iter { - iter: self.map.iter().flat_map(foo), - size: self.size, - } - } - - pub fn iter_mut(&mut self) -> IterMut<'_, K, V> - where - K: Ord, - { - fn foo<'a, K, V>( - (k, oom): (&'a K, &'a mut OneOrMore<V>), - ) -> IterMutInternalIntermediate<'a, K, V> { - iter::repeat(k).zip(oom.iter_mut()) - } - IterMut { - iter: self.map.iter_mut().flat_map(foo), - size: self.size, - } - } - } - - impl<K, V> Default for DupTreeMap<K, V> - where - K: Ord, - { - fn default() -> Self { - Self::new() - } - } - - impl<K, V> IntoIterator for DupTreeMap<K, V> - where - K: Ord + Clone, - { - type Item = (K, V); - type IntoIter = IntoIter<K, V>; - - fn into_iter(self) -> Self::IntoIter { - fn foo<K, V>( - (k, oom): (K, OneOrMore<V>), - ) -> IntoIterInternalIntermediate<K, V> - where - K: Clone, - { - iter::repeat(k).zip(oom.into_iter()) - } - IntoIter { - iter: self.map.into_iter().flat_map(foo), - size: self.size, - } - } - } - - impl<'a, K, V> IntoIterator for &'a DupTreeMap<K, V> - where - K: Ord, - { - type Item = (&'a K, &'a V); - type IntoIter = Iter<'a, K, V>; - - fn into_iter(self) -> Self::IntoIter { - self.iter() - } - } - - impl<'a, K, V> IntoIterator for &'a mut DupTreeMap<K, V> - where - K: Ord, - { - type Item = (&'a K, &'a mut V); - type IntoIter = IterMut<'a, K, V>; - - fn into_iter(self) -> Self::IntoIter { - self.iter_mut() - } - } - - impl<K, V> iter::FromIterator<(K, V)> for DupTreeMap<K, V> - where - K: Ord, - { - fn from_iter<T>(iter: T) -> Self - where - T: IntoIterator<Item = (K, V)>, - { - let mut map = DupTreeMap::new(); - for (k, v) in iter { - map.insert(k, v); - } - map - } - } - - impl<'a, K, V> Iterator for Iter<'a, K, V> { - type Item = (&'a K, &'a V); - - fn next(&mut self) -> Option<Self::Item> { - let next = self.iter.next(); - if next.is_some() { - self.size -= 1; - } - next - } - - fn size_hint(&self) -> (usize, Option<usize>) { - (self.size, Some(self.size)) - } - } - - impl<'a, K, V> Iterator for IterMut<'a, K, V> { - type Item = (&'a K, &'a mut V); - - fn next(&mut self) -> Option<Self::Item> { - let next = self.iter.next(); - if next.is_some() { - self.size -= 1; - } - next - } - - fn size_hint(&self) -> (usize, Option<usize>) { - (self.size, Some(self.size)) - } - } - - impl<K, V> Iterator for IntoIter<K, V> - where - K: Clone, - { - type Item = (K, V); - - fn next(&mut self) -> Option<Self::Item> { - let next = self.iter.next(); - if next.is_some() { - self.size -= 1; - } - next - } - - fn size_hint(&self) -> (usize, Option<usize>) { - (self.size, Some(self.size)) - } - } - - // unsafe impl<K, V> iter::TrustedLen for IntoIter<K, V> {} -} - -mod dup_tree_set { - use super::DupTreeMap; - use std::iter; - - #[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)] - pub struct DupTreeSet<K> { - map: DupTreeMap<K, ()>, - } - - pub type Iter<'a, K> = iter::Map< - super::dup_tree_map::Iter<'a, K, ()>, - for<'b> fn((&'b K, &'b ())) -> &'b K, - >; - pub type IntoIter<K> = - iter::Map<super::dup_tree_map::IntoIter<K, ()>, fn((K, ())) -> K>; - - impl<K> DupTreeSet<K> { - pub fn new() -> Self - where - K: Ord, - { - DupTreeSet { - map: DupTreeMap::new(), - } - } - - pub fn len(&self) -> usize { - self.map.len() - } - pub fn is_empty(&self) -> bool { - self.map.is_empty() - } - - pub fn iter(&self) -> Iter<'_, K> - where - K: Ord, - { - fn foo<'a, K>((k, ()): (&'a K, &'a ())) -> &'a K { - k - } - self.map.iter().map(foo) - } - } - - impl<K> Default for DupTreeSet<K> - where - K: Ord, - { - fn default() -> Self { - Self::new() - } - } - - impl<K> IntoIterator for DupTreeSet<K> - where - K: Ord + Clone, - { - type Item = K; - type IntoIter = IntoIter<K>; - - fn into_iter(self) -> Self::IntoIter { - fn foo<K>((k, ()): (K, ())) -> K { - k - } - self.map.into_iter().map(foo) - } - } - - impl<'a, K> IntoIterator for &'a DupTreeSet<K> - where - K: Ord, - { - type Item = &'a K; - type IntoIter = Iter<'a, K>; - - fn into_iter(self) -> Self::IntoIter { - self.iter() - } - } - - impl<K> iter::FromIterator<K> for DupTreeSet<K> - where - K: Ord, - { - fn from_iter<T>(iter: T) -> Self - where - T: IntoIterator<Item = K>, - { - let map = iter.into_iter().map(|k| (k, ())).collect(); - DupTreeSet { map } - } - } -} diff --git a/dhall/src/syntax/core/mod.rs b/dhall/src/syntax/core/mod.rs deleted file mode 100644 index 66bf229..0000000 --- a/dhall/src/syntax/core/mod.rs +++ /dev/null @@ -1,13 +0,0 @@ -mod expr; -pub use expr::*; -mod import; -pub use import::*; -mod label; -pub use label::*; -mod span; -pub use span::*; -mod text; -pub use text::*; -pub mod context; -pub mod map; -pub mod visitor; diff --git a/dhall/src/syntax/core/span.rs b/dhall/src/syntax/core/span.rs deleted file mode 100644 index f9c7008..0000000 --- a/dhall/src/syntax/core/span.rs +++ /dev/null @@ -1,81 +0,0 @@ -use std::rc::Rc; - -/// A location in the source text -#[derive(Debug, Clone)] -pub struct ParsedSpan { - input: Rc<str>, - /// # Safety - /// - /// Must be a valid character boundary index into `input`. - start: usize, - /// # Safety - /// - /// Must be a valid character boundary index into `input`. - end: usize, -} - -#[derive(Debug, Clone)] -pub enum Span { - /// A location in the source text - Parsed(ParsedSpan), - /// For expressions obtained from decoding binary - Decoded, - /// For expressions constructed during normalization/typecheck - Artificial, -} - -impl Span { - pub(crate) fn make(input: Rc<str>, sp: pest::Span) -> Self { - Span::Parsed(ParsedSpan { - input, - start: sp.start(), - end: sp.end(), - }) - } - - /// Takes the union of the two spans, i.e. the range of input covered by the two spans plus any - /// input between them. Assumes that the spans come from the same input. Fails if one of the - /// spans does not point to an input location. - pub fn union(&self, other: &Span) -> Self { - use std::cmp::{max, min}; - use Span::*; - match (self, other) { - (Parsed(x), Parsed(y)) if Rc::ptr_eq(&x.input, &y.input) => { - Parsed(ParsedSpan { - input: x.input.clone(), - start: min(x.start, y.start), - end: max(x.end, y.end), - }) - } - _ => panic!( - "Tried to union incompatible spans: {:?} and {:?}", - self, other - ), - } - } - - /// Merges two spans assumed to point to a similar thing. If only one of them points to an - /// input location, use that one. - pub fn merge(&self, other: &Span) -> Self { - use Span::*; - match (self, other) { - (Parsed(x), _) | (_, Parsed(x)) => Parsed(x.clone()), - (Artificial, _) | (_, Artificial) => Artificial, - (Decoded, Decoded) => Decoded, - } - } - - pub fn error(&self, message: impl Into<String>) -> String { - use pest::error::{Error, ErrorVariant}; - use pest::Span; - let message: String = message.into(); - let span = match self { - self::Span::Parsed(span) => span, - _ => return format!("[unknown location] {}", message), - }; - let span = Span::new(&*span.input, span.start, span.end).unwrap(); - let err: ErrorVariant<!> = ErrorVariant::CustomError { message }; - let err = Error::new_from_span(err, span); - format!("{}", err) - } -} diff --git a/dhall/src/syntax/core/text.rs b/dhall/src/syntax/core/text.rs deleted file mode 100644 index fb390ee..0000000 --- a/dhall/src/syntax/core/text.rs +++ /dev/null @@ -1,181 +0,0 @@ -use std::iter::FromIterator; - -#[derive(Debug, Clone, PartialEq, Eq, Hash)] -pub struct InterpolatedText<SubExpr> { - head: String, - tail: Vec<(SubExpr, String)>, -} - -impl<SubExpr> From<(String, Vec<(SubExpr, String)>)> - for InterpolatedText<SubExpr> -{ - fn from(x: (String, Vec<(SubExpr, String)>)) -> Self { - InterpolatedText { - head: x.0, - tail: x.1, - } - } -} - -impl<SubExpr> From<String> for InterpolatedText<SubExpr> { - fn from(s: String) -> Self { - InterpolatedText { - head: s, - tail: vec![], - } - } -} - -#[derive(Debug, Clone, PartialEq, Eq)] -pub enum InterpolatedTextContents<SubExpr> { - Text(String), - Expr(SubExpr), -} - -impl<SubExpr> InterpolatedTextContents<SubExpr> { - pub fn is_empty(&self) -> bool { - use InterpolatedTextContents::{Expr, Text}; - match self { - Expr(_) => false, - Text(s) => s.is_empty(), - } - } - - pub fn traverse_ref<'a, SubExpr2, E, F>( - &'a self, - mut f: F, - ) -> Result<InterpolatedTextContents<SubExpr2>, E> - where - F: FnMut(&'a SubExpr) -> Result<SubExpr2, E>, - { - use InterpolatedTextContents::{Expr, Text}; - Ok(match self { - Expr(e) => Expr(f(e)?), - Text(s) => Text(s.clone()), - }) - } - pub fn traverse_mut<'a, E, F>(&'a mut self, mut f: F) -> Result<(), E> - where - F: FnMut(&'a mut SubExpr) -> Result<(), E>, - { - use InterpolatedTextContents::Expr; - if let Expr(e) = self { - f(e)?; - } - Ok(()) - } - pub fn map_ref<'a, SubExpr2, F>( - &'a self, - mut f: F, - ) -> InterpolatedTextContents<SubExpr2> - where - F: FnMut(&'a SubExpr) -> SubExpr2, - { - use InterpolatedTextContents::{Expr, Text}; - match self { - Expr(e) => Expr(f(e)), - Text(s) => Text(s.clone()), - } - } - pub fn map_mut<'a, F>(&'a mut self, mut f: F) - where - F: FnMut(&'a mut SubExpr), - { - use InterpolatedTextContents::Expr; - if let Expr(e) = self { - f(e); - } - } -} - -impl<SubExpr> InterpolatedText<SubExpr> { - pub fn len(&self) -> usize { - 1 + 2 * self.tail.len() - } - - pub fn head(&self) -> &str { - &self.head - } - - pub fn head_mut(&mut self) -> &mut String { - &mut self.head - } - - pub fn is_empty(&self) -> bool { - self.head.is_empty() && self.tail.is_empty() - } - - pub fn traverse_ref<'a, SubExpr2, E, F>( - &'a self, - mut f: F, - ) -> Result<InterpolatedText<SubExpr2>, E> - where - F: FnMut(&'a SubExpr) -> Result<SubExpr2, E>, - { - Ok(InterpolatedText { - head: self.head.clone(), - tail: self - .tail - .iter() - .map(|(e, s)| Ok((f(e)?, s.clone()))) - .collect::<Result<_, _>>()?, - }) - } - - pub fn traverse_mut<'a, E, F>(&'a mut self, mut f: F) -> Result<(), E> - where - F: FnMut(&'a mut SubExpr) -> Result<(), E>, - { - for (e, _) in &mut self.tail { - f(e)? - } - Ok(()) - } - - pub fn iter<'a>( - &'a self, - ) -> impl Iterator<Item = InterpolatedTextContents<&'a SubExpr>> + 'a { - use std::iter::once; - use InterpolatedTextContents::{Expr, Text}; - let exprs = self.tail.iter().map(|(e, _)| Expr(e)); - let texts = self.tail.iter().map(|(_, s)| Text(s.clone())); - once(Text(self.head.clone())).chain(itertools::interleave(exprs, texts)) - } - - pub fn into_iter( - self, - ) -> impl Iterator<Item = InterpolatedTextContents<SubExpr>> { - use std::iter::once; - use InterpolatedTextContents::{Expr, Text}; - once(Text(self.head)).chain( - self.tail - .into_iter() - .flat_map(|(e, s)| once(Expr(e)).chain(once(Text(s)))), - ) - } -} - -impl<SubExpr> FromIterator<InterpolatedTextContents<SubExpr>> - for InterpolatedText<SubExpr> -{ - fn from_iter<T>(iter: T) -> Self - where - T: IntoIterator<Item = InterpolatedTextContents<SubExpr>>, - { - let mut res = InterpolatedText { - head: String::new(), - tail: Vec::new(), - }; - let mut crnt_str = &mut res.head; - for x in iter.into_iter() { - match x { - InterpolatedTextContents::Text(s) => crnt_str.push_str(&s), - InterpolatedTextContents::Expr(e) => { - res.tail.push((e, String::new())); - crnt_str = &mut res.tail.last_mut().unwrap().1; - } - } - } - res - } -} diff --git a/dhall/src/syntax/core/visitor.rs b/dhall/src/syntax/core/visitor.rs deleted file mode 100644 index b76d037..0000000 --- a/dhall/src/syntax/core/visitor.rs +++ /dev/null @@ -1,360 +0,0 @@ -use crate::syntax::*; -use std::iter::FromIterator; - -/// A visitor trait that can be used to traverse `ExprF`s. We need this pattern so that Rust lets -/// us have as much mutability as we can. -/// For example, `traverse_ref_with_special_handling_of_binders` cannot be made using only -/// `traverse_ref`, because `traverse_ref` takes a `FnMut` so we would need to pass multiple -/// mutable reverences to this argument to `traverse_ref`. But Rust's ownership system is all about -/// preventing exactly this ! So we have to be more clever. The visitor pattern allows us to have -/// only one mutable thing the whole time: the visitor itself. The visitor can then carry around -/// multiple closures or just one, and Rust is ok with either. See for example TraverseRefVisitor. -pub trait ExprFVisitor<'a, SE1, SE2, E1, E2>: Sized { - type Error; - - fn visit_subexpr(&mut self, subexpr: &'a SE1) -> Result<SE2, Self::Error>; - fn visit_embed(self, embed: &'a E1) -> Result<E2, Self::Error>; - - fn visit_subexpr_under_binder( - mut self, - _label: &'a Label, - subexpr: &'a SE1, - ) -> Result<SE2, Self::Error> { - self.visit_subexpr(subexpr) - } - - fn visit( - self, - input: &'a ExprF<SE1, E1>, - ) -> Result<ExprF<SE2, E2>, Self::Error> { - visit_ref(self, input) - } -} - -/// Like `ExprFVisitor`, but by mutable reference -pub trait ExprFMutVisitor<'a, SE, E>: Sized { - type Error; - - fn visit_subexpr(&mut self, subexpr: &'a mut SE) - -> Result<(), Self::Error>; - fn visit_embed(self, _embed: &'a mut E) -> Result<(), Self::Error> { - Ok(()) - } - - fn visit_subexpr_under_binder( - mut self, - _label: &'a mut Label, - subexpr: &'a mut SE, - ) -> Result<(), Self::Error> { - self.visit_subexpr(subexpr) - } - - fn visit(self, input: &'a mut ExprF<SE, E>) -> Result<(), Self::Error> { - visit_mut(self, input) - } -} - -fn visit_ref<'a, V, SE1, SE2, E1, E2>( - mut v: V, - input: &'a ExprF<SE1, E1>, -) -> Result<ExprF<SE2, E2>, V::Error> -where - V: ExprFVisitor<'a, SE1, SE2, E1, E2>, -{ - fn vec<'a, T, U, Err, F: FnMut(&'a T) -> Result<U, Err>>( - x: &'a [T], - f: F, - ) -> Result<Vec<U>, Err> { - x.iter().map(f).collect() - } - fn opt<'a, T, U, Err, F: FnOnce(&'a T) -> Result<U, Err>>( - x: &'a Option<T>, - f: F, - ) -> Result<Option<U>, Err> { - Ok(match x { - Some(x) => Some(f(x)?), - None => None, - }) - } - fn dupmap<'a, V, SE1, SE2, E1, E2, T>( - x: impl IntoIterator<Item = (&'a Label, &'a SE1)>, - mut v: V, - ) -> Result<T, V::Error> - where - SE1: 'a, - T: FromIterator<(Label, SE2)>, - V: ExprFVisitor<'a, SE1, SE2, E1, E2>, - { - x.into_iter() - .map(|(k, x)| Ok((k.clone(), v.visit_subexpr(x)?))) - .collect() - } - fn optdupmap<'a, V, SE1, SE2, E1, E2, T>( - x: impl IntoIterator<Item = (&'a Label, &'a Option<SE1>)>, - mut v: V, - ) -> Result<T, V::Error> - where - SE1: 'a, - T: FromIterator<(Label, Option<SE2>)>, - V: ExprFVisitor<'a, SE1, SE2, E1, E2>, - { - x.into_iter() - .map(|(k, x)| { - Ok(( - k.clone(), - match x { - Some(x) => Some(v.visit_subexpr(x)?), - None => None, - }, - )) - }) - .collect() - } - - use crate::syntax::ExprF::*; - Ok(match input { - Var(v) => Var(v.clone()), - Lam(l, t, e) => { - let t = v.visit_subexpr(t)?; - let e = v.visit_subexpr_under_binder(l, e)?; - Lam(l.clone(), t, e) - } - Pi(l, t, e) => { - let t = v.visit_subexpr(t)?; - let e = v.visit_subexpr_under_binder(l, e)?; - Pi(l.clone(), t, e) - } - Let(l, t, a, e) => { - let t = opt(t, &mut |e| v.visit_subexpr(e))?; - let a = v.visit_subexpr(a)?; - let e = v.visit_subexpr_under_binder(l, e)?; - Let(l.clone(), t, a, e) - } - App(f, a) => App(v.visit_subexpr(f)?, v.visit_subexpr(a)?), - Annot(x, t) => Annot(v.visit_subexpr(x)?, v.visit_subexpr(t)?), - Const(k) => Const(*k), - Builtin(v) => Builtin(*v), - BoolLit(b) => BoolLit(*b), - NaturalLit(n) => NaturalLit(*n), - IntegerLit(n) => IntegerLit(*n), - DoubleLit(n) => DoubleLit(*n), - TextLit(t) => TextLit(t.traverse_ref(|e| v.visit_subexpr(e))?), - BinOp(o, x, y) => BinOp(*o, v.visit_subexpr(x)?, v.visit_subexpr(y)?), - BoolIf(b, t, f) => BoolIf( - v.visit_subexpr(b)?, - v.visit_subexpr(t)?, - v.visit_subexpr(f)?, - ), - EmptyListLit(t) => EmptyListLit(v.visit_subexpr(t)?), - NEListLit(es) => NEListLit(vec(es, |e| v.visit_subexpr(e))?), - SomeLit(e) => SomeLit(v.visit_subexpr(e)?), - RecordType(kts) => RecordType(dupmap(kts, v)?), - RecordLit(kvs) => RecordLit(dupmap(kvs, v)?), - UnionType(kts) => UnionType(optdupmap(kts, v)?), - Merge(x, y, t) => Merge( - v.visit_subexpr(x)?, - v.visit_subexpr(y)?, - opt(t, |e| v.visit_subexpr(e))?, - ), - ToMap(x, t) => { - ToMap(v.visit_subexpr(x)?, opt(t, |e| v.visit_subexpr(e))?) - } - Field(e, l) => Field(v.visit_subexpr(e)?, l.clone()), - Projection(e, ls) => Projection(v.visit_subexpr(e)?, ls.clone()), - ProjectionByExpr(e, x) => { - ProjectionByExpr(v.visit_subexpr(e)?, v.visit_subexpr(x)?) - } - Assert(e) => Assert(v.visit_subexpr(e)?), - Import(i) => Import(i.traverse_ref(|e| v.visit_subexpr(e))?), - Embed(a) => Embed(v.visit_embed(a)?), - }) -} - -fn visit_mut<'a, V, SE, E>( - mut v: V, - input: &'a mut ExprF<SE, E>, -) -> Result<(), V::Error> -where - V: ExprFMutVisitor<'a, SE, E>, -{ - fn vec<'a, V, SE, E>(v: &mut V, x: &'a mut Vec<SE>) -> Result<(), V::Error> - where - V: ExprFMutVisitor<'a, SE, E>, - { - for x in x { - v.visit_subexpr(x)?; - } - Ok(()) - } - fn opt<'a, V, SE, E>( - v: &mut V, - x: &'a mut Option<SE>, - ) -> Result<(), V::Error> - where - V: ExprFMutVisitor<'a, SE, E>, - { - if let Some(x) = x { - v.visit_subexpr(x)?; - } - Ok(()) - } - fn dupmap<'a, V, SE, E>( - mut v: V, - x: impl IntoIterator<Item = (&'a Label, &'a mut SE)>, - ) -> Result<(), V::Error> - where - SE: 'a, - V: ExprFMutVisitor<'a, SE, E>, - { - for (_, x) in x { - v.visit_subexpr(x)?; - } - Ok(()) - } - fn optdupmap<'a, V, SE, E>( - mut v: V, - x: impl IntoIterator<Item = (&'a Label, &'a mut Option<SE>)>, - ) -> Result<(), V::Error> - where - SE: 'a, - V: ExprFMutVisitor<'a, SE, E>, - { - for (_, x) in x { - opt(&mut v, x)?; - } - Ok(()) - } - - use crate::syntax::ExprF::*; - match input { - Var(_) | Const(_) | Builtin(_) | BoolLit(_) | NaturalLit(_) - | IntegerLit(_) | DoubleLit(_) => {} - Lam(l, t, e) => { - v.visit_subexpr(t)?; - v.visit_subexpr_under_binder(l, e)?; - } - Pi(l, t, e) => { - v.visit_subexpr(t)?; - v.visit_subexpr_under_binder(l, e)?; - } - Let(l, t, a, e) => { - opt(&mut v, t)?; - v.visit_subexpr(a)?; - v.visit_subexpr_under_binder(l, e)?; - } - App(f, a) => { - v.visit_subexpr(f)?; - v.visit_subexpr(a)?; - } - Annot(x, t) => { - v.visit_subexpr(x)?; - v.visit_subexpr(t)?; - } - TextLit(t) => t.traverse_mut(|e| v.visit_subexpr(e))?, - BinOp(_, x, y) => { - v.visit_subexpr(x)?; - v.visit_subexpr(y)?; - } - BoolIf(b, t, f) => { - v.visit_subexpr(b)?; - v.visit_subexpr(t)?; - v.visit_subexpr(f)?; - } - EmptyListLit(t) => v.visit_subexpr(t)?, - NEListLit(es) => vec(&mut v, es)?, - SomeLit(e) => v.visit_subexpr(e)?, - RecordType(kts) => dupmap(v, kts)?, - RecordLit(kvs) => dupmap(v, kvs)?, - UnionType(kts) => optdupmap(v, kts)?, - Merge(x, y, t) => { - v.visit_subexpr(x)?; - v.visit_subexpr(y)?; - opt(&mut v, t)?; - } - ToMap(x, t) => { - v.visit_subexpr(x)?; - opt(&mut v, t)?; - } - Field(e, _) => v.visit_subexpr(e)?, - Projection(e, _) => v.visit_subexpr(e)?, - ProjectionByExpr(e, x) => { - v.visit_subexpr(e)?; - v.visit_subexpr(x)?; - } - Assert(e) => v.visit_subexpr(e)?, - Import(i) => i.traverse_mut(|e| v.visit_subexpr(e))?, - Embed(a) => v.visit_embed(a)?, - } - Ok(()) -} - -pub struct TraverseRefWithBindersVisitor<F1, F2> { - pub visit_subexpr: F1, - pub visit_under_binder: F2, -} - -impl<'a, SE, E, SE2, Err, F1, F2> ExprFVisitor<'a, SE, SE2, E, E> - for TraverseRefWithBindersVisitor<F1, F2> -where - SE: 'a, - E: 'a + Clone, - F1: FnMut(&'a SE) -> Result<SE2, Err>, - F2: FnOnce(&'a Label, &'a SE) -> Result<SE2, Err>, -{ - type Error = Err; - - fn visit_subexpr(&mut self, subexpr: &'a SE) -> Result<SE2, Self::Error> { - (self.visit_subexpr)(subexpr) - } - fn visit_subexpr_under_binder( - self, - label: &'a Label, - subexpr: &'a SE, - ) -> Result<SE2, Self::Error> { - (self.visit_under_binder)(label, subexpr) - } - fn visit_embed(self, embed: &'a E) -> Result<E, Self::Error> { - Ok(embed.clone()) - } -} - -pub struct TraverseRefVisitor<F1> { - pub visit_subexpr: F1, -} - -impl<'a, SE, E, SE2, Err, F1> ExprFVisitor<'a, SE, SE2, E, E> - for TraverseRefVisitor<F1> -where - SE: 'a, - E: 'a + Clone, - F1: FnMut(&'a SE) -> Result<SE2, Err>, -{ - type Error = Err; - - fn visit_subexpr(&mut self, subexpr: &'a SE) -> Result<SE2, Self::Error> { - (self.visit_subexpr)(subexpr) - } - fn visit_embed(self, embed: &'a E) -> Result<E, Self::Error> { - Ok(embed.clone()) - } -} - -pub struct TraverseMutVisitor<F1> { - pub visit_subexpr: F1, -} - -impl<'a, SE, E, Err, F1> ExprFMutVisitor<'a, SE, E> for TraverseMutVisitor<F1> -where - SE: 'a, - E: 'a, - F1: FnMut(&'a mut SE) -> Result<(), Err>, -{ - type Error = Err; - - fn visit_subexpr( - &mut self, - subexpr: &'a mut SE, - ) -> Result<(), Self::Error> { - (self.visit_subexpr)(subexpr) - } -} |