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/// 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 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,
}
impl IntoIterator for File {
type Item = String;
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()
}
}
/// The location of import (i.e. local vs. remote vs. environment)
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub enum ImportLocation {
Local(FilePrefix, File),
Remote(URL),
Env(String),
Missing,
}
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub struct URL {
pub scheme: Scheme,
pub authority: String,
pub path: File,
pub query: Option<String>,
pub headers: Option<Box<ImportHashed>>,
}
#[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,
}
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub enum Hash {
SHA256(Vec<u8>),
}
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub struct ImportHashed {
pub location: ImportLocation,
pub hash: Option<Hash>,
}
/// Reference to an external resource
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub struct Import {
pub mode: ImportMode,
pub location_hashed: ImportHashed,
}
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();
loop {
let component = dir_components.next();
match component.as_ref() {
// ───────────────────
// canonicalize(ε) = ε
None => break,
// canonicalize(directory₀) = directory₁
// ───────────────────────────────────────
// canonicalize(directory₀/.) = directory₁
Some(c) if c == "." => continue,
Some(c) if c == ".." => match dir_components.next() {
// canonicalize(directory₀) = ε
// ────────────────────────────
// canonicalize(directory₀/..) = /..
None => components.push("..".to_string()),
// canonicalize(directory₀) = directory₁/..
// ──────────────────────────────────────────────
// canonicalize(directory₀/..) = directory₁/../..
Some(ref c) if c == ".." => {
components.push("..".to_string());
components.push("..".to_string());
},
// canonicalize(directory₀) = directory₁/component
// ─────────────────────────────────────────────── ; If "component" is not
// canonicalize(directory₀/..) = directory₁ ; ".."
Some(_) => continue,
},
// canonicalize(directory₀) = directory₁
// ───────────────────────────────────────────────────────── ; If no other
// canonicalize(directory₀/component) = directory₁/component ; rule matches
Some(c) => components.push(c.clone()),
}
}
Directory { components: components }
}
}
impl Canonicalize for File {
fn canonicalize(&self) -> File {
File { directory: self.directory.canonicalize(), file: self.file.clone() }
}
}
impl Canonicalize for ImportLocation {
fn canonicalize(&self) -> ImportLocation {
match self {
ImportLocation::Local(prefix, file) => ImportLocation::Local(*prefix, file.canonicalize()),
ImportLocation::Remote(url) => ImportLocation::Remote(URL {
scheme: url.scheme,
authority: url.authority.clone(),
path: url.path.canonicalize(),
query: url.query.clone(),
headers: url.headers.clone().map(|boxed_hash| Box::new(boxed_hash.canonicalize())),
}),
ImportLocation::Env(name) => ImportLocation::Env(name.to_string()),
ImportLocation::Missing => ImportLocation::Missing,
}
}
}
impl Canonicalize for ImportHashed {
fn canonicalize(&self) -> ImportHashed {
ImportHashed { hash: self.hash.clone(), location: self.location.canonicalize() }
}
}
impl Canonicalize for Import {
fn canonicalize(&self) -> Import {
Import { mode: self.mode, location_hashed: self.location_hashed.canonicalize() }
}
}
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