From e73f822b6972e8fa2e72b56ff5378b91bea1a5e6 Mon Sep 17 00:00:00 2001
From: Fintan Halpenny
Date: Mon, 2 Sep 2019 21:17:00 +0100
Subject: Remove the notion of Directory and have File be the vector of
 components

---
 dhall_syntax/src/core/import.rs | 49 +++++++++++------------------------------
 dhall_syntax/src/parser.rs      | 23 +++++--------------
 2 files changed, 19 insertions(+), 53 deletions(-)

(limited to 'dhall_syntax/src')

diff --git a/dhall_syntax/src/core/import.rs b/dhall_syntax/src/core/import.rs
index 82bb7ff..4aad70d 100644
--- a/dhall_syntax/src/core/import.rs
+++ b/dhall_syntax/src/core/import.rs
@@ -11,24 +11,9 @@ pub enum FilePrefix {
     Home,
 }
 
-#[derive(Debug, Clone, PartialEq, Eq, Hash)]
-pub struct Directory {
-    pub components: Vec<String>,
-}
-
-impl IntoIterator for Directory {
-    type Item = String;
-    type IntoIter = ::std::vec::IntoIter<Self::Item>;
-
-    fn into_iter(self) -> Self::IntoIter {
-        self.components.into_iter()
-    }
-}
-
 #[derive(Debug, Clone, PartialEq, Eq, Hash)]
 pub struct File {
-    pub directory: Directory,
-    pub file: String,
+    pub file_path: Vec<String>,
 }
 
 impl IntoIterator for File {
@@ -36,9 +21,7 @@ impl IntoIterator for File {
     type IntoIter = ::std::vec::IntoIter<Self::Item>;
 
     fn into_iter(self) -> Self::IntoIter {
-        let mut paths = self.directory.components;
-        paths.push(self.file);
-        paths.into_iter()
+        self.file_path.into_iter()
     }
 }
 
@@ -97,13 +80,13 @@ pub trait Canonicalize {
     fn canonicalize(&self) -> Self;
 }
 
-impl Canonicalize for Directory {
-    fn canonicalize(&self) -> Directory {
-        let mut components = Vec::new();
-        let mut dir_components = self.clone().into_iter();
+impl Canonicalize for File {
+    fn canonicalize(&self) -> File {
+        let mut file_path = Vec::new();
+        let mut file_path_components = self.clone().into_iter();
 
         loop {
-           let component = dir_components.next();
+           let component = file_path_components.next();
            match component.as_ref() {
                // ───────────────────
                // canonicalize(ε) = ε
@@ -114,18 +97,18 @@ impl Canonicalize for Directory {
                // canonicalize(directory₀/.) = directory₁
                Some(c) if c == "." => continue,
 
-               Some(c) if c == ".." => match dir_components.next() {
+               Some(c) if c == ".." => match file_path_components.next() {
                    // canonicalize(directory₀) = ε
                    // ────────────────────────────
                    // canonicalize(directory₀/..) = /..
-                   None => components.push("..".to_string()),
+                   None => file_path.push("..".to_string()),
 
                    // canonicalize(directory₀) = directory₁/..
                    // ──────────────────────────────────────────────
                    // canonicalize(directory₀/..) = directory₁/../..
                    Some(ref c) if c == ".." => {
-                       components.push("..".to_string());
-                       components.push("..".to_string());
+                       file_path.push("..".to_string());
+                       file_path.push("..".to_string());
                    },
 
                    // canonicalize(directory₀) = directory₁/component
@@ -137,17 +120,11 @@ impl Canonicalize for Directory {
                // canonicalize(directory₀) = directory₁
                // ─────────────────────────────────────────────────────────  ; If no other
                // canonicalize(directory₀/component) = directory₁/component  ; rule matches
-               Some(c) => components.push(c.clone()),
+               Some(c) => file_path.push(c.clone()),
            }
         }
 
-        Directory { components: components }
-    }
-}
-
-impl Canonicalize for File {
-    fn canonicalize(&self) -> File {
-        File { directory: self.directory.canonicalize(), file: self.file.clone() }
+        File { file_path }
     }
 }
 
diff --git a/dhall_syntax/src/parser.rs b/dhall_syntax/src/parser.rs
index a2495ee..71d0936 100644
--- a/dhall_syntax/src/parser.rs
+++ b/dhall_syntax/src/parser.rs
@@ -147,14 +147,6 @@ fn debug_pair(pair: Pair<Rule>) -> String {
     s
 }
 
-fn to_file(path: Vec<String>) -> Result<File, String> {
-    let mut path = path;
-    let file_name: Option<String> = path.pop();
-    let file = file_name.ok_or("Empty file path was provided")?;
-    let directory = Directory { components: path };
-    Ok(File { directory: directory, file: file })
-}
-
 macro_rules! make_parser {
     (@pattern, rule, $name:ident) => (Rule::$name);
     (@pattern, token_rule, $name:ident) => (Rule::$name);
@@ -638,22 +630,20 @@ make_parser! {
     });
 
     rule!(http_raw<URL>; children!(
-        [scheme(sch), authority(auth), path(p)] => {
-            let file = to_file(p)?;
+        [scheme(sch), authority(auth), path(file_path)] => {
             URL {
                 scheme: sch,
                 authority: auth,
-                path: file,
+                path: File { file_path },
                 query: None,
                 headers: None,
             }
         },
-        [scheme(sch), authority(auth), path(p), query(q)] => {
-            let file = to_file(p)?;
+        [scheme(sch), authority(auth), path(file_path), query(q)] => {
             URL {
                 scheme: sch,
                 authority: auth,
-                path: file,
+                path: File { file_path },
                 query: Some(q),
                 headers: None,
             }
@@ -709,9 +699,8 @@ make_parser! {
         [http(url)] => {
             ImportLocation::Remote(url)
         },
-        [local((prefix, p))] => {
-            let file = to_file(p)?;
-            ImportLocation::Local(prefix, file)
+        [local((prefix, file_path))] => {
+            ImportLocation::Local(prefix, File { file_path })
         },
     ));
 
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