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use std::collections::HashMap;
use std::path::{Path, PathBuf};
use crate::error::{Error, ImportError};
use crate::phase::{Normalized, NormalizedSubExpr, Parsed, Resolved};
type Import = dhall_syntax::Import<NormalizedSubExpr>;
/// A root from which to resolve relative imports.
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum ImportRoot {
LocalDir(PathBuf),
}
type ImportCache = HashMap<Import, Normalized>;
pub type ImportStack = Vec<Import>;
fn resolve_import(
import: &Import,
root: &ImportRoot,
import_cache: &mut ImportCache,
import_stack: &ImportStack,
) -> Result<Normalized, ImportError> {
use self::ImportRoot::*;
use dhall_syntax::FilePrefix::*;
use dhall_syntax::ImportLocation::*;
let cwd = match root {
LocalDir(cwd) => cwd,
};
match &import.location {
Local(prefix, path) => {
let path: PathBuf = path.iter().cloned().collect();
let path = match prefix {
// TODO: fail gracefully
Parent => cwd.parent().unwrap().join(path),
Here => cwd.join(path),
_ => unimplemented!("{:?}", import),
};
Ok(load_import(&path, import_cache, import_stack).map_err(|e| {
ImportError::Recursive(import.clone(), Box::new(e))
})?)
}
_ => unimplemented!("{:?}", import),
}
}
fn load_import(
f: &Path,
import_cache: &mut ImportCache,
import_stack: &ImportStack,
) -> Result<Normalized, Error> {
Ok(
do_resolve_expr(Parsed::parse_file(f)?, import_cache, import_stack)?
.typecheck()?
.normalize(),
)
}
fn do_resolve_expr(
Parsed(expr, root): Parsed,
import_cache: &mut ImportCache,
import_stack: &ImportStack,
) -> Result<Resolved, ImportError> {
let resolve = |import: &Import| -> Result<Normalized, ImportError> {
if import_stack.contains(import) {
return Err(ImportError::ImportCycle(
import_stack.clone(),
import.clone(),
));
}
match import_cache.get(import) {
Some(expr) => Ok(expr.clone()),
None => {
// Copy the import stack and push the current import
let mut import_stack = import_stack.clone();
import_stack.push(import.clone());
// Resolve the import recursively
let expr =
resolve_import(import, &root, import_cache, &import_stack)?;
// Add the import to the cache
import_cache.insert(import.clone(), expr.clone());
Ok(expr)
}
}
};
let expr = expr.traverse_resolve(resolve)?;
Ok(Resolved(expr))
}
pub fn resolve(e: Parsed) -> Result<Resolved, ImportError> {
do_resolve_expr(e, &mut HashMap::new(), &Vec::new())
}
pub fn skip_resolve_expr(
Parsed(expr, _root): Parsed,
) -> Result<Resolved, ImportError> {
let resolve = |import: &Import| -> Result<Normalized, ImportError> {
Err(ImportError::UnexpectedImport(import.clone()))
};
let expr = expr.traverse_resolve(resolve)?;
Ok(Resolved(expr))
}
#[cfg(test)]
#[rustfmt::skip]
mod spec_tests {
macro_rules! import_success {
($name:ident, $path:expr) => {
make_spec_test!(Import, Success, $name, &("../dhall-lang/tests/import/success/".to_owned() + $path));
};
}
// macro_rules! import_failure {
// ($name:ident, $path:expr) => {
// make_spec_test!(Import, Failure, $name, &("../dhall-lang/tests/import/failure/".to_owned() + $path));
// };
// }
// import_success!(success_alternativeEnvNatural, "alternativeEnvNatural");
// import_success!(success_alternativeEnvSimple, "alternativeEnvSimple");
// import_success!(success_alternativeHashMismatch, "alternativeHashMismatch");
// import_success!(success_alternativeNatural, "alternativeNatural");
// import_success!(success_alternativeParseError, "alternativeParseError");
// import_success!(success_alternativeTypeError, "alternativeTypeError");
// import_success!(success_asLocation, "asLocation");
// import_success!(success_asText, "asText");
// import_success!(success_customHeaders, "customHeaders");
import_success!(success_fieldOrder, "fieldOrder");
// note: this one needs special setup with env variables
// import_success!(success_hashFromCache, "hashFromCache");
// import_success!(success_headerForwarding, "headerForwarding");
// import_success!(success_nestedHash, "nestedHash");
// import_success!(success_noHeaderForwarding, "noHeaderForwarding");
// import_failure!(failure_alternativeEnv, "alternativeEnv");
// import_failure!(failure_alternativeEnvMissing, "alternativeEnvMissing");
// import_failure!(failure_cycle, "cycle");
// import_failure!(failure_hashMismatch, "hashMismatch");
// import_failure!(failure_missing, "missing");
// import_failure!(failure_referentiallyInsane, "referentiallyInsane");
}
|
