From e5d9aee00b0c775df1d8e2d8819aeb80dffa73c2 Mon Sep 17 00:00:00 2001
From: Nadrieril
Date: Fri, 1 Mar 2019 17:28:19 +0100
Subject: Split abnf_to_pest and dhall into their own crates

---
 src/context.rs | 51 ---------------------------------------------------
 1 file changed, 51 deletions(-)
 delete mode 100644 src/context.rs

(limited to 'src/context.rs')

diff --git a/src/context.rs b/src/context.rs
deleted file mode 100644
index c2e1913..0000000
--- a/src/context.rs
+++ /dev/null
@@ -1,51 +0,0 @@
-use std::collections::HashMap;
-
-/// A `(Context a)` associates `Text` labels with values of type `a`
-///
-/// The `Context` is used for type-checking when `(a = Expr X)`
-///
-/// * 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<'i, T>(HashMap<&'i str, Vec<T>>);
-
-impl<'i, T> Context<'i, 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: &str, n: usize) -> Option<&'a T> {
-        self.0.get(k).and_then(|v| v.get(v.len() - 1 - n))
-    }
-
-    pub fn map<U, F: Fn(&T) -> U>(&self, f: F) -> Context<'i, U> {
-        Context(self.0.iter().map(|(k, v)| (*k, v.iter().map(&f).collect())).collect())
-    }
-}
-
-impl<'i, T: Clone> Context<'i, T> {
-    /// Add a key-value pair to the `Context`
-    pub fn insert(&self, k: &'i str, v: T) -> Self {
-        let mut ctx = (*self).clone();
-        {
-            let m = ctx.0.entry(k).or_insert_with(Vec::new);
-            m.push(v);
-        }
-        ctx
-    }
-}
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