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import_map.rs
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import_map.rs
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use indexmap::IndexMap;
use path_slash::PathBufExt;
use relative_path::RelativePath;
use serde::Deserialize;
use std::{collections::HashMap, path::Path};
type SpecifierHashMap = HashMap<String, String>;
type SpecifierMap = IndexMap<String, String>;
#[derive(Clone, Debug, Deserialize)]
#[serde(deny_unknown_fields)]
pub struct ImportHashMap {
#[serde(default)]
pub imports: SpecifierHashMap,
#[serde(default)]
pub scopes: HashMap<String, SpecifierHashMap>,
}
impl Default for ImportHashMap {
fn default() -> Self {
ImportHashMap {
imports: HashMap::new(),
scopes: HashMap::new(),
}
}
}
#[derive(Clone, Debug, Eq, PartialEq)]
pub struct ImportMap {
pub imports: SpecifierMap,
pub scopes: IndexMap<String, SpecifierMap>,
}
impl ImportMap {
pub fn from_hashmap(map: ImportHashMap) -> Self {
let mut imports: SpecifierMap = IndexMap::new();
let mut scopes = IndexMap::new();
for (k, v) in map.imports.iter() {
if k.eq("@/") || k.eq("~/") {
imports.insert(
k.into(),
RelativePath::new(v)
.normalize()
.to_path(Path::new("/"))
.to_slash()
.unwrap()
.into(),
);
} else {
imports.insert(k.into(), v.into());
}
}
for (k, v) in map.scopes.iter() {
let mut map: SpecifierMap = IndexMap::new();
for (k, v) in v.iter() {
if k.eq("@/") || k.eq("~/") {
imports.insert(
k.into(),
RelativePath::new(v)
.normalize()
.to_path(Path::new("/"))
.to_slash()
.unwrap()
.into(),
);
} else {
map.insert(k.into(), v.into());
}
}
scopes.insert(k.into(), map);
}
ImportMap { imports, scopes }
}
pub fn resolve(&self, specifier: &str, url: &str) -> String {
for (prefix, scope_imports) in self.scopes.iter() {
if prefix.ends_with("/") && specifier.starts_with(prefix) {
match scope_imports.get(url) {
Some(alias) => {
return alias.to_owned();
}
_ => {}
};
for (k, alias) in scope_imports.iter() {
if k.ends_with("/") && url.starts_with(k) {
let mut alias = alias.to_owned();
alias.push_str(url[k.len()..].into());
return alias;
}
}
}
}
match self.imports.get(url) {
Some(alias) => {
return alias.to_owned();
}
_ => {}
};
for (k, alias) in self.imports.iter() {
if k.ends_with("/") && url.starts_with(k) {
let mut alias = alias.to_owned();
alias.push_str(url[k.len()..].into());
return alias;
}
}
url.into()
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn resolve_import_maps() {
let mut imports: SpecifierHashMap = HashMap::new();
let mut scopes: HashMap<String, SpecifierHashMap> = HashMap::new();
let mut scope_imports: SpecifierHashMap = HashMap::new();
imports.insert("@/".into(), "./".into());
imports.insert("~/".into(), "./".into());
imports.insert("react".into(), "https://esm.sh/react".into());
imports.insert("react-dom/".into(), "https://esm.sh/react-dom/".into());
imports.insert(
"https://deno.land/x/aleph/".into(),
"http://localhost:2020/".into(),
);
scope_imports.insert("react".into(), "https://esm.sh/react@16.4.0".into());
scopes.insert("/scope/".into(), scope_imports);
let import_map = ImportMap::from_hashmap(ImportHashMap { imports, scopes });
assert_eq!(
import_map.resolve("/pages/index.tsx", "@/components/logo.tsx"),
"/components/logo.tsx"
);
assert_eq!(
import_map.resolve("/pages/index.tsx", "~/components/logo.tsx"),
"/components/logo.tsx"
);
assert_eq!(
import_map.resolve("/app.tsx", "react"),
"https://esm.sh/react"
);
assert_eq!(
import_map.resolve("/app.tsx", "https://deno.land/x/aleph/mod.ts"),
"http://localhost:2020/mod.ts"
);
assert_eq!(
import_map.resolve("/framework/react/renderer.ts", "react-dom/server"),
"https://esm.sh/react-dom/server"
);
assert_eq!(
import_map.resolve("/scope/react-dom", "react"),
"https://esm.sh/react@16.4.0"
);
}
}