From f54d49e38b15c30a8b2cef8d85a8f69b1edbf3c5 Mon Sep 17 00:00:00 2001
From: Nadrieril
Date: Tue, 17 Dec 2019 14:22:08 +0000
Subject: Remove unused syntax::context module

---
 dhall/src/syntax/core/context.rs | 80 ----------------------------------------
 dhall/src/syntax/core/mod.rs     |  1 -
 dhall/src/syntax/mod.rs          |  1 -
 3 files changed, 82 deletions(-)
 delete mode 100644 dhall/src/syntax/core/context.rs

(limited to 'dhall/src/syntax')

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::*;
-- 
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