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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 FilePath {
pub file_path: Vec<String>,
}
/// The location of import (i.e. local vs. remote vs. environment)
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub enum ImportLocation<SubExpr> {
Local(FilePrefix, FilePath),
Remote(URL<SubExpr>),
Env(String),
Missing,
}
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub struct URL<SubExpr> {
pub scheme: Scheme,
pub authority: String,
pub path: FilePath,
pub query: Option<String>,
pub headers: Option<SubExpr>,
}
#[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,
Location,
}
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub enum Hash {
SHA256(Vec<u8>),
}
/// Reference to an external resource
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub struct Import<SubExpr> {
pub mode: ImportMode,
pub location: ImportLocation<SubExpr>,
pub hash: Option<Hash>,
}
impl<SE> URL<SE> {
pub fn traverse_ref<'a, Err, SE2>(
&'a self,
f: impl FnOnce(&'a SE) -> Result<SE2, Err>,
) -> Result<URL<SE2>, Err> {
let headers = self.headers.as_ref().map(f).transpose()?;
Ok(URL {
scheme: self.scheme,
authority: self.authority.clone(),
path: self.path.clone(),
query: self.query.clone(),
headers,
})
}
pub fn traverse_mut<'a, Err>(
&'a mut self,
f: impl FnOnce(&'a mut SE) -> Result<(), Err>,
) -> Result<(), Err> {
if let Some(header) = &mut self.headers {
f(header)?;
}
Ok(())
}
}
impl<SE> ImportLocation<SE> {
pub fn traverse_ref<'a, Err, SE2>(
&'a self,
f: impl FnOnce(&'a SE) -> Result<SE2, Err>,
) -> Result<ImportLocation<SE2>, Err> {
use ImportLocation::*;
Ok(match self {
Local(prefix, path) => Local(*prefix, path.clone()),
Remote(url) => Remote(url.traverse_ref(f)?),
Env(env) => Env(env.clone()),
Missing => Missing,
})
}
pub fn traverse_mut<'a, Err>(
&'a mut self,
f: impl FnOnce(&'a mut SE) -> Result<(), Err>,
) -> Result<(), Err> {
if let ImportLocation::Remote(url) = self {
url.traverse_mut(f)?;
}
Ok(())
}
}
impl<SE> Import<SE> {
pub fn traverse_ref<'a, Err, SE2>(
&'a self,
f: impl FnOnce(&'a SE) -> Result<SE2, Err>,
) -> Result<Import<SE2>, Err> {
Ok(Import {
mode: self.mode,
location: self.location.traverse_ref(f)?,
hash: self.hash.clone(),
})
}
pub fn traverse_mut<'a, Err>(
&'a mut self,
f: impl FnOnce(&'a mut SE) -> Result<(), Err>,
) -> Result<(), Err> {
self.location.traverse_mut(f)
}
}
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