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authorNadrieril2019-12-17 14:22:08 +0000
committerNadrieril2019-12-19 21:34:07 +0000
commitf54d49e38b15c30a8b2cef8d85a8f69b1edbf3c5 (patch)
tree681eb06ec9b3e3061d1dfaed4de327f2de4b8061
parent91ef0cf697d56c91a8d15937aa4669dc221cd6c1 (diff)
Remove unused syntax::context module
Diffstat (limited to '')
-rw-r--r--dhall/src/syntax/core/context.rs80
-rw-r--r--dhall/src/syntax/core/mod.rs1
-rw-r--r--dhall/src/syntax/mod.rs1
3 files changed, 0 insertions, 82 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/mod.rs b/dhall/src/syntax/core/mod.rs
index 66bf229..1950154 100644
--- a/dhall/src/syntax/core/mod.rs
+++ b/dhall/src/syntax/core/mod.rs
@@ -8,6 +8,5 @@ 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/mod.rs b/dhall/src/syntax/mod.rs
index a82e827..6efa9cd 100644
--- a/dhall/src/syntax/mod.rs
+++ b/dhall/src/syntax/mod.rs
@@ -6,7 +6,6 @@
)]
mod core;
-pub use crate::syntax::core::context;
pub use crate::syntax::core::visitor;
pub use crate::syntax::core::*;
pub use crate::syntax::text::parser::*;