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use std::fmt;
use url::Url;
#[derive(Debug, Clone, PartialEq)]
/// Resolved module specifier
pub struct ModuleSpecifier(Url);
impl ModuleSpecifier {
pub fn to_url(&self) -> Url {
self.0.clone()
}
/// Resolves module using this algorithm:
/// https://html.spec.whatwg.org/multipage/webappapis.html#resolve-a-module-specifier
pub fn resolve(
specifier: &str,
base: &str,
) -> Result<ModuleSpecifier, url::ParseError> {
// 1. Apply the URL parser to specifier. If the result is not failure, return
// the result.
// let specifier = parse_local_or_remote(specifier)?.to_string();
if let Ok(url) = Url::parse(specifier) {
return Ok(ModuleSpecifier(url));
}
// 2. If specifier does not start with the character U+002F SOLIDUS (/), the
// two-character sequence U+002E FULL STOP, U+002F SOLIDUS (./), or the
// three-character sequence U+002E FULL STOP, U+002E FULL STOP, U+002F
// SOLIDUS (../), return failure.
if !specifier.starts_with('/')
&& !specifier.starts_with("./")
&& !specifier.starts_with("../")
{
// TODO This is (probably) not the correct error to return here.
// TODO: This error is very not-user-friendly
return Err(url::ParseError::RelativeUrlWithCannotBeABaseBase);
}
// 3. Return the result of applying the URL parser to specifier with base URL
// as the base URL.
let base_url = Url::parse(base)?;
let u = base_url.join(&specifier)?;
Ok(ModuleSpecifier(u))
}
/// Takes a string representing a path or URL to a module, but of the type
/// passed through the command-line interface for the main module. This is
/// slightly different than specifiers used in import statements: "foo.js" for
/// example is allowed here, whereas in import statements a leading "./" is
/// required ("./foo.js"). This function is aware of the current working
/// directory and returns an absolute URL.
pub fn resolve_root(
root_specifier: &str,
) -> Result<ModuleSpecifier, url::ParseError> {
if let Ok(url) = Url::parse(root_specifier) {
Ok(ModuleSpecifier(url))
} else {
let cwd = std::env::current_dir().unwrap();
let base = Url::from_directory_path(cwd).unwrap();
let url = base.join(root_specifier)?;
Ok(ModuleSpecifier(url))
}
}
}
impl fmt::Display for ModuleSpecifier {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
self.0.fmt(f)
}
}
impl From<Url> for ModuleSpecifier {
fn from(url: Url) -> Self {
ModuleSpecifier(url)
}
}
impl PartialEq<String> for ModuleSpecifier {
fn eq(&self, other: &String) -> bool {
&self.to_string() == other
}
}