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-rw-r--r--dhall/src/semantics/resolve/cache.rs687
-rw-r--r--dhall/src/semantics/resolve/mod.rs2
-rw-r--r--dhall/src/semantics/resolve/resolve.rs26
3 files changed, 707 insertions, 8 deletions
diff --git a/dhall/src/semantics/resolve/cache.rs b/dhall/src/semantics/resolve/cache.rs
new file mode 100644
index 0000000..b725bf3
--- /dev/null
+++ b/dhall/src/semantics/resolve/cache.rs
@@ -0,0 +1,687 @@
+use std::env;
+use std::io::Write;
+use std::path::{Path, PathBuf};
+
+use crate::error::{CacheError, Error, ErrorKind};
+use crate::parse::parse_binary_file;
+use crate::semantics::{Import, TypedHir};
+use crate::syntax::Hash;
+use crate::syntax::{binary, Expr};
+use crate::Parsed;
+use std::env::VarError;
+use std::ffi::OsStr;
+use std::fs::File;
+
+#[cfg(unix)]
+const ALTERNATE_ENV_VAR: &str = "HOME";
+
+#[cfg(windows)]
+const ALTERNATE_ENV_VAR: &str = "LOCALAPPDATA";
+
+fn alternate_env_var_cache_dir(
+ provider: impl Fn(&str) -> Result<String, VarError>,
+) -> Option<PathBuf> {
+ provider(ALTERNATE_ENV_VAR)
+ .map(PathBuf::from)
+ .map(|env_dir| env_dir.join(".cache").join("dhall"))
+ .ok()
+}
+
+fn env_var_cache_dir(
+ provider: impl Fn(&str) -> Result<String, VarError>,
+) -> Option<PathBuf> {
+ provider("XDG_CACHE_HOME")
+ .map(PathBuf::from)
+ .map(|cache_home| cache_home.join("dhall"))
+ .ok()
+}
+
+fn load_cache_dir(
+ provider: impl Fn(&str) -> Result<String, VarError> + Copy,
+) -> Result<PathBuf, CacheError> {
+ env_var_cache_dir(provider)
+ .or_else(|| alternate_env_var_cache_dir(provider))
+ .ok_or(CacheError::MissingConfiguration)
+}
+
+#[derive(Debug, PartialEq)]
+pub struct Cache {
+ cache_dir: Option<PathBuf>,
+}
+
+impl Cache {
+ fn new_with_provider(
+ provider: impl Fn(&str) -> Result<String, VarError> + Copy,
+ ) -> Cache {
+ // Should warn that we can't initialize cache on error
+ let cache_dir = load_cache_dir(provider).and_then(|path| {
+ if !path.exists() {
+ std::fs::create_dir_all(path.as_path())
+ .map(|_| path)
+ .map_err(|e| CacheError::InitialisationError { cause: e })
+ } else {
+ Ok(path)
+ }
+ });
+ Cache {
+ cache_dir: cache_dir.ok(),
+ }
+ }
+
+ pub fn new() -> Cache {
+ Cache::new_with_provider(|name| env::var(OsStr::new(name)))
+ }
+}
+
+impl Cache {
+ fn cache_file(&self, import: &Import) -> Option<PathBuf> {
+ self.cache_dir
+ .as_ref()
+ .and_then(|cache_dir| {
+ import.hash.as_ref().map(|hash| (cache_dir, hash))
+ })
+ .map(|(cache_dir, hash)| cache_dir.join(cache_filename(hash)))
+ }
+
+ fn search_cache_file(&self, import: &Import) -> Option<PathBuf> {
+ self.cache_file(import)
+ .filter(|cache_file| cache_file.exists())
+ }
+
+ fn search_cache(&self, import: &Import) -> Option<Result<Parsed, Error>> {
+ self.search_cache_file(import)
+ .map(|cache_file| parse_binary_file(cache_file.as_path()))
+ }
+
+ // Side effect since we don't use the result
+ fn delete_cache(&self, import: &Import) {
+ self.search_cache_file(import)
+ .map(|cache_file| std::fs::remove_file(cache_file.as_path()));
+ }
+
+ // Side effect since we don't use the result
+ fn save_expr(&self, import: &Import, expr: &Expr) {
+ self.cache_file(import)
+ .map(|cache_file| save_expr(cache_file.as_path(), expr));
+ }
+
+ pub fn caching_import<F, R>(
+ &self,
+ import: &Import,
+ fetcher: F,
+ mut resolver: R,
+ ) -> Result<TypedHir, Error>
+ where
+ F: FnOnce() -> Result<Parsed, Error>,
+ R: FnMut(Parsed) -> Result<TypedHir, Error>,
+ {
+ // Lookup the cache
+ self.search_cache(import)
+ // On cache found
+ .and_then(|cache_result| {
+ // Try to resolve the cache imported content
+ match cache_result.and_then(|parsed| resolver(parsed)).and_then(
+ |typed_hir| {
+ check_hash(import.hash.as_ref().unwrap(), typed_hir)
+ },
+ ) {
+ // Cache content is invalid (can't be parsed / can't be resolved / content sha invalid )
+ Err(_) => {
+ // Delete cache file since it's invalid
+ self.delete_cache(import);
+ // Result as there were no cache
+ None
+ }
+ // Cache valid
+ r => Some(r),
+ }
+ })
+ .unwrap_or_else(|| {
+ // Fetch and resolve as provided
+ let imported = fetcher().and_then(resolver);
+ // Save in cache the result if ok
+ let _ = imported.as_ref().map(|(hir, _)| {
+ self.save_expr(import, &hir.to_expr_noopts())
+ });
+ imported
+ })
+ }
+}
+
+fn save_expr(file_path: &Path, expr: &Expr) -> Result<(), Error> {
+ File::create(file_path)?.write_all(binary::encode(expr)?.as_slice())?;
+ Ok(())
+}
+
+fn check_hash(hash: &Hash, typed_hir: TypedHir) -> Result<TypedHir, Error> {
+ if hash.as_ref()[..] != typed_hir.0.to_expr_alpha().hash()?[..] {
+ Err(Error::new(ErrorKind::Cache(CacheError::CacheHashInvalid)))
+ } else {
+ Ok(typed_hir)
+ }
+}
+
+fn cache_filename<A: AsRef<[u8]>>(v: A) -> String {
+ format!("1220{}", hex::encode(v.as_ref()))
+}
+
+impl AsRef<[u8]> for Hash {
+ fn as_ref(&self) -> &[u8] {
+ match self {
+ Hash::SHA256(sha) => sha.as_slice(),
+ }
+ }
+}
+
+#[cfg(test)]
+mod test {
+ use super::*;
+ use crate::semantics::parse::parse_str;
+ use crate::syntax::{
+ parse_expr, ExprKind, ImportMode, ImportTarget, NumKind, Span,
+ };
+ use rand::distributions::Alphanumeric;
+ use rand::Rng;
+ use std::env::temp_dir;
+
+ #[cfg(unix)]
+ #[test]
+ fn alternate_env_var_cache_dir_should_result_unix_folder_path() {
+ let actual =
+ alternate_env_var_cache_dir(|_| Ok("/home/user".to_string()));
+ assert_eq!(actual, Some(PathBuf::from("/home/user/.cache/dhall")));
+ }
+
+ #[test]
+ fn alternate_env_var_cache_dir_should_result_none_on_missing_var() {
+ let actual = alternate_env_var_cache_dir(|_| Err(VarError::NotPresent));
+ assert_eq!(actual, None);
+ }
+
+ #[test]
+ fn env_var_cache_dir_should_result_xdg_cache_home() {
+ let actual = env_var_cache_dir(|_| {
+ Ok("/home/user/custom/path/for/cache".to_string())
+ });
+ assert_eq!(
+ actual,
+ Some(PathBuf::from("/home/user/custom/path/for/cache/dhall"))
+ );
+ }
+
+ #[test]
+ fn env_var_cache_dir_should_result_none_on_missing_var() {
+ let actual = env_var_cache_dir(|_| Err(VarError::NotPresent));
+ assert_eq!(actual, None);
+ }
+
+ #[test]
+ fn load_cache_dir_should_result_xdg_cache_first() {
+ let actual = load_cache_dir(|var| match var {
+ "XDG_CACHE_HOME" => Ok("/home/user/custom".to_string()),
+ _ => Err(VarError::NotPresent),
+ });
+ assert_eq!(actual.unwrap(), PathBuf::from("/home/user/custom/dhall"));
+ }
+
+ #[cfg(unix)]
+ #[test]
+ fn load_cache_dir_should_result_alternate() {
+ let actual = load_cache_dir(|var| match var {
+ ALTERNATE_ENV_VAR => Ok("/home/user".to_string()),
+ _ => Err(VarError::NotPresent),
+ });
+ assert_eq!(actual.unwrap(), PathBuf::from("/home/user/.cache/dhall"));
+ }
+
+ #[test]
+ fn load_cache_dir_should_result_none() {
+ let actual = load_cache_dir(|_| Err(VarError::NotPresent));
+ assert!(matches!(
+ actual.unwrap_err(),
+ CacheError::MissingConfiguration
+ ));
+ }
+
+ #[test]
+ fn new_with_provider_should_create_cache_folder() {
+ let test_id = rand::thread_rng()
+ .sample_iter(Alphanumeric)
+ .take(36)
+ .collect::<String>();
+ let dir = temp_dir().join(test_id);
+
+ std::fs::create_dir_all(dir.as_path()).unwrap();
+
+ let actual = Cache::new_with_provider(|_| {
+ Ok(dir.clone().to_str().map(String::from).unwrap())
+ });
+ assert_eq!(
+ actual,
+ Cache {
+ cache_dir: Some(dir.join("dhall"))
+ }
+ );
+ assert!(dir.join("dhall").exists());
+ std::fs::remove_dir_all(dir.as_path()).unwrap();
+ }
+
+ #[test]
+ fn new_with_provider_should_return_cache_for_existing_folder() {
+ let test_id = rand::thread_rng()
+ .sample_iter(Alphanumeric)
+ .take(36)
+ .collect::<String>();
+ let dir = temp_dir().join(test_id);
+
+ std::fs::create_dir_all(dir.as_path()).unwrap();
+ File::create(dir.join("dhall")).unwrap();
+
+ assert!(dir.join("dhall").exists());
+
+ let actual = Cache::new_with_provider(|_| {
+ Ok(dir.clone().to_str().map(String::from).unwrap())
+ });
+ assert_eq!(
+ actual,
+ Cache {
+ cache_dir: Some(dir.join("dhall"))
+ }
+ );
+ std::fs::remove_dir_all(dir.as_path()).unwrap();
+ }
+
+ #[test]
+ fn caching_import_should_load_cache() -> Result<(), Error> {
+ let test_id = rand::thread_rng()
+ .sample_iter(Alphanumeric)
+ .take(36)
+ .collect::<String>();
+ let dir = temp_dir().join(test_id);
+
+ std::fs::create_dir_all(dir.as_path())?;
+
+ let cache = Cache::new_with_provider(|_| {
+ Ok(dir.clone().to_str().map(String::from).unwrap())
+ });
+
+ // Create cache file
+ let expr =
+ Expr::new(ExprKind::Num(NumKind::Natural(1)), Span::Artificial);
+ File::create(dir.join("dhall").join("1220d60d8415e36e86dae7f42933d3b0c4fe3ca238f057fba206c7e9fbf5d784fe15"))?
+ .write_all(binary::encode(&expr)?.as_ref())?;
+
+ let import = Import {
+ mode: ImportMode::Code,
+ location: ImportTarget::Missing,
+ hash: Some(Hash::SHA256(hex::decode("d60d8415e36e86dae7f42933d3b0c4fe3ca238f057fba206c7e9fbf5d784fe15").unwrap())),
+ };
+
+ let mut resolve_counter = 0;
+
+ let result = cache.caching_import(
+ &import,
+ || panic!("Should not fetch import"),
+ |parsed| {
+ resolve_counter += 1;
+ let result = parsed.resolve()?.typecheck()?;
+ Ok((result.normalize().to_hir(), result.ty))
+ },
+ );
+
+ assert!(result.is_ok());
+ assert_eq!(resolve_counter, 1);
+
+ std::fs::remove_dir_all(dir.as_path()).unwrap();
+ Ok(())
+ }
+
+ #[test]
+ fn caching_import_should_skip_cache_if_missing_cache_folder(
+ ) -> Result<(), Error> {
+ let cache = Cache::new_with_provider(|_| Err(VarError::NotPresent));
+
+ let import = Import {
+ mode: ImportMode::Code,
+ location: ImportTarget::Missing,
+ hash: Some(Hash::SHA256(hex::decode("d60d8415e36e86dae7f42933d3b0c4fe3ca238f057fba206c7e9fbf5d784fe15").unwrap())),
+ };
+
+ let mut resolve_counter = 0;
+ let mut fetcher_counter = 0;
+
+ let result = cache.caching_import(
+ &import,
+ || {
+ fetcher_counter += 1;
+ parse_str("1")
+ },
+ |parsed| {
+ resolve_counter += 1;
+ let result = parsed.resolve()?.typecheck()?;
+ Ok((result.normalize().to_hir(), result.ty))
+ },
+ );
+
+ assert!(result.is_ok(), "caching_import Should be valid");
+ assert_eq!(resolve_counter, 1);
+ assert_eq!(fetcher_counter, 1);
+ Ok(())
+ }
+
+ #[test]
+ fn caching_import_should_skip_cache_on_no_hash_import() -> Result<(), Error>
+ {
+ let cache = Cache::new_with_provider(|_| Err(VarError::NotPresent));
+
+ let import = Import {
+ mode: ImportMode::Code,
+ location: ImportTarget::Missing,
+ hash: None,
+ };
+
+ let mut resolve_counter = 0;
+ let mut fetcher_counter = 0;
+
+ let result = cache.caching_import(
+ &import,
+ || {
+ fetcher_counter += 1;
+ parse_str("1")
+ },
+ |parsed| {
+ resolve_counter += 1;
+ let result = parsed.resolve()?.typecheck()?;
+ Ok((result.normalize().to_hir(), result.ty))
+ },
+ );
+
+ assert!(result.is_ok(), "caching_import Should be valid");
+ assert_eq!(resolve_counter, 1);
+ assert_eq!(fetcher_counter, 1);
+ Ok(())
+ }
+
+ #[test]
+ fn caching_import_should_fetch_import_if_no_cache() -> Result<(), Error> {
+ let test_id = rand::thread_rng()
+ .sample_iter(Alphanumeric)
+ .take(36)
+ .collect::<String>();
+ let dir = temp_dir().join(test_id);
+
+ std::fs::create_dir_all(dir.as_path())?;
+
+ let cache = Cache::new_with_provider(|_| {
+ Ok(dir.clone().to_str().map(String::from).unwrap())
+ });
+
+ let import = Import {
+ mode: ImportMode::Code,
+ location: ImportTarget::Missing,
+ hash: Some(Hash::SHA256(hex::decode("d60d8415e36e86dae7f42933d3b0c4fe3ca238f057fba206c7e9fbf5d784fe15").unwrap())),
+ };
+
+ let mut fetcher_counter = 0;
+ let mut resolve_counter = 0;
+
+ let result = cache.caching_import(
+ &import,
+ || {
+ fetcher_counter += 1;
+ parse_str("1")
+ },
+ |parsed| {
+ resolve_counter += 1;
+ let result = parsed.resolve()?.typecheck()?;
+ Ok((result.normalize().to_hir(), result.ty))
+ },
+ );
+
+ assert!(result.is_ok(), "caching_import Should be valid");
+ assert_eq!(resolve_counter, 1);
+ assert_eq!(fetcher_counter, 1);
+
+ std::fs::remove_dir_all(dir.as_path()).unwrap();
+ Ok(())
+ }
+
+ #[test]
+ fn caching_import_should_fetch_import_on_cache_parsed_error(
+ ) -> Result<(), Error> {
+ let test_id = rand::thread_rng()
+ .sample_iter(Alphanumeric)
+ .take(36)
+ .collect::<String>();
+ let dir = temp_dir().join(test_id);
+
+ std::fs::create_dir_all(dir.as_path())?;
+
+ let cache = Cache::new_with_provider(|_| {
+ Ok(dir.clone().to_str().map(String::from).unwrap())
+ });
+
+ File::create(dir.join("dhall").join("1220d60d8415e36e86dae7f42933d3b0c4fe3ca238f057fba206c7e9fbf5d784fe15"))?
+ .write_all("Invalid content".as_bytes())?;
+
+ let import = Import {
+ mode: ImportMode::Code,
+ location: ImportTarget::Missing,
+ hash: Some(Hash::SHA256(hex::decode("d60d8415e36e86dae7f42933d3b0c4fe3ca238f057fba206c7e9fbf5d784fe15").unwrap())),
+ };
+
+ let mut fetcher_counter = 0;
+ let mut resolve_counter = 0;
+
+ let result = cache.caching_import(
+ &import,
+ || {
+ fetcher_counter += 1;
+ parse_str("1")
+ },
+ |parsed| {
+ resolve_counter += 1;
+ let result = parsed.resolve()?.typecheck()?;
+ Ok((result.normalize().to_hir(), result.ty))
+ },
+ );
+
+ assert!(result.is_ok(), "caching_import Should be valid");
+ assert_eq!(fetcher_counter, 1, "Should fetch since cache is invalid");
+ assert_eq!(
+ resolve_counter, 1,
+ "Should resolve only 1 time because cache can't be parsed"
+ );
+
+ std::fs::remove_dir_all(dir.as_path()).unwrap();
+ Ok(())
+ }
+
+ #[test]
+ fn caching_import_should_fetch_import_on_cache_resolve_error(
+ ) -> Result<(), Error> {
+ let test_id = rand::thread_rng()
+ .sample_iter(Alphanumeric)
+ .take(36)
+ .collect::<String>();
+ let dir = temp_dir().join(test_id);
+
+ std::fs::create_dir_all(dir.as_path())?;
+
+ let cache = Cache::new_with_provider(|_| {
+ Ok(dir.clone().to_str().map(String::from).unwrap())
+ });
+
+ let expr =
+ Expr::new(ExprKind::Num(NumKind::Natural(2)), Span::Artificial);
+ File::create(dir.join("dhall").join("1220d60d8415e36e86dae7f42933d3b0c4fe3ca238f057fba206c7e9fbf5d784fe15"))?
+ .write_all(binary::encode(&expr)?.as_slice())?;
+
+ let import = Import {
+ mode: ImportMode::Code,
+ location: ImportTarget::Missing,
+ hash: Some(Hash::SHA256(hex::decode("d60d8415e36e86dae7f42933d3b0c4fe3ca238f057fba206c7e9fbf5d784fe15").unwrap())),
+ };
+
+ let mut fetcher_counter = 0;
+ let mut resolve_counter = 0;
+
+ let result = cache.caching_import(
+ &import,
+ || {
+ fetcher_counter += 1;
+ parse_str("1")
+ },
+ |parsed| {
+ resolve_counter += 1;
+ match resolve_counter {
+ 1 => Err(Error::new(ErrorKind::Cache(
+ CacheError::CacheHashInvalid,
+ ))),
+ _ => {
+ let result = parsed.resolve()?.typecheck()?;
+ Ok((result.normalize().to_hir(), result.ty))
+ }
+ }
+ },
+ );
+
+ assert!(result.is_ok(), "caching_import Should be valid");
+ assert_eq!(fetcher_counter, 1, "Should fetch since cache is invalid");
+ assert_eq!(
+ resolve_counter, 2,
+ "Should resolve 2 time (one for cache that fail, one for fetch)"
+ );
+
+ std::fs::remove_dir_all(dir.as_path()).unwrap();
+ Ok(())
+ }
+
+ #[test]
+ fn caching_import_should_fetch_import_on_invalid_hash_cache_content(
+ ) -> Result<(), Error> {
+ let test_id = rand::thread_rng()
+ .sample_iter(Alphanumeric)
+ .take(36)
+ .collect::<String>();
+ let dir = temp_dir().join(test_id);
+
+ std::fs::create_dir_all(dir.as_path())?;
+
+ let cache = Cache::new_with_provider(|_| {
+ Ok(dir.clone().to_str().map(String::from).unwrap())
+ });
+
+ let expr =
+ Expr::new(ExprKind::Num(NumKind::Natural(2)), Span::Artificial);
+ File::create(dir.join("dhall").join("1220d60d8415e36e86dae7f42933d3b0c4fe3ca238f057fba206c7e9fbf5d784fe15"))?
+ .write_all(binary::encode(&expr)?.as_slice())?;
+
+ let import = Import {
+ mode: ImportMode::Code,
+ location: ImportTarget::Missing,
+ hash: Some(Hash::SHA256(hex::decode("d60d8415e36e86dae7f42933d3b0c4fe3ca238f057fba206c7e9fbf5d784fe15").unwrap())),
+ };
+
+ let mut fetcher_counter = 0;
+ let mut resolve_counter = 0;
+
+ let result = cache.caching_import(
+ &import,
+ || {
+ fetcher_counter += 1;
+ parse_str("1")
+ },
+ |parsed| {
+ resolve_counter += 1;
+ let result = parsed.resolve()?.typecheck()?;
+ Ok((result.normalize().to_hir(), result.ty))
+ },
+ );
+
+ assert!(result.is_ok(), "caching_import Should be valid");
+ assert_eq!(fetcher_counter, 1, "Should fetch since cache is invalid");
+ assert_eq!(
+ resolve_counter, 2,
+ "Should resolve 2 time (one for cache, one for fetch)"
+ );
+
+ std::fs::remove_dir_all(dir.as_path()).unwrap();
+ Ok(())
+ }
+
+ #[test]
+ fn caching_import_should_save_import_if_missing() -> Result<(), Error> {
+ let test_id = rand::thread_rng()
+ .sample_iter(Alphanumeric)
+ .take(36)
+ .collect::<String>();
+ let dir = temp_dir().join(test_id);
+
+ std::fs::create_dir_all(dir.as_path())?;
+
+ let cache = Cache::new_with_provider(|_| {
+ Ok(dir.clone().to_str().map(String::from).unwrap())
+ });
+ let import = Import {
+ mode: ImportMode::Code,
+ location: ImportTarget::Missing,
+ hash: Some(Hash::SHA256(hex::decode("d60d8415e36e86dae7f42933d3b0c4fe3ca238f057fba206c7e9fbf5d784fe15").unwrap())),
+ };
+
+ let mut fetcher_counter = 0;
+ let mut resolve_counter = 0;
+
+ let result = cache.caching_import(
+ &import,
+ || {
+ fetcher_counter += 1;
+ parse_str("1")
+ },
+ |parsed| {
+ resolve_counter += 1;
+ let result = parsed.resolve()?.typecheck()?;
+ Ok((result.normalize().to_hir(), result.ty))
+ },
+ );
+
+ assert!(result.is_ok(), "caching_import Should be valid");
+ assert_eq!(fetcher_counter, 1, "Should fetch since cache is mising");
+ assert_eq!(resolve_counter, 1, "Should resolve 1 time");
+
+ let cache_file = dir.join("dhall").join("1220d60d8415e36e86dae7f42933d3b0c4fe3ca238f057fba206c7e9fbf5d784fe15");
+ assert!(cache_file.exists());
+
+ std::fs::remove_dir_all(dir.as_path()).unwrap();
+ Ok(())
+ }
+
+ #[test]
+ fn cache_filename_should_result_for_hash() {
+ let hash =
+ Hash::SHA256(parse_expr("1").unwrap().hash().unwrap().into_vec());
+ assert_eq!("1220d60d8415e36e86dae7f42933d3b0c4fe3ca238f057fba206c7e9fbf5d784fe15".to_string(), cache_filename(hash));
+ }
+
+ #[test]
+ fn check_hash_should_be_ok_for_same_hash() -> Result<(), Error> {
+ let typed = parse_str("1")?.resolve()?.typecheck()?;
+ let hash = Hash::SHA256(parse_expr("1")?.hash()?.into_vec());
+
+ let expected = (typed.normalize().to_hir(), typed.ty);
+ let actual = check_hash(&hash, expected.clone());
+ assert_eq!(actual.unwrap(), expected);
+ Ok(())
+ }
+
+ #[test]
+ fn check_hash_should_be_ok_for_unmatching_hash() -> Result<(), Error> {
+ let typed = parse_str("1")?.resolve()?.typecheck()?;
+ let hash = Hash::SHA256(parse_expr("2")?.hash()?.into_vec());
+
+ let expected = (typed.normalize().to_hir(), typed.ty);
+ let actual = check_hash(&hash, expected);
+ assert!(actual.is_err());
+ Ok(())
+ }
+}
diff --git a/dhall/src/semantics/resolve/mod.rs b/dhall/src/semantics/resolve/mod.rs
index 33b477e..b79cf65 100644
--- a/dhall/src/semantics/resolve/mod.rs
+++ b/dhall/src/semantics/resolve/mod.rs
@@ -1,6 +1,8 @@
+pub mod cache;
pub mod env;
pub mod hir;
pub mod resolve;
+pub use cache::*;
pub use env::*;
pub use hir::*;
pub use resolve::*;
diff --git a/dhall/src/semantics/resolve/resolve.rs b/dhall/src/semantics/resolve/resolve.rs
index e96f16b..3b72b9e 100644
--- a/dhall/src/semantics/resolve/resolve.rs
+++ b/dhall/src/semantics/resolve/resolve.rs
@@ -9,7 +9,7 @@ use crate::builtins::Builtin;
use crate::error::ErrorBuilder;
use crate::error::{Error, ImportError};
use crate::operations::{BinOp, OpKind};
-use crate::semantics::{mkerr, Hir, HirKind, ImportEnv, NameEnv, Type};
+use crate::semantics::{mkerr, Cache, Hir, HirKind, ImportEnv, NameEnv, Type};
use crate::syntax;
use crate::syntax::{
Expr, ExprKind, FilePath, FilePrefix, Hash, ImportMode, ImportTarget, Span,
@@ -209,6 +209,7 @@ fn make_aslocation_uniontype() -> Expr {
fn resolve_one_import(
env: &mut ImportEnv,
+ cache: &Cache,
import: &Import,
location: &ImportLocation,
span: Span,
@@ -217,10 +218,16 @@ fn resolve_one_import(
let location = location.chain(&import.location, do_sanity_check)?;
env.handle_import(location.clone(), |env| match import.mode {
ImportMode::Code => {
- let parsed = location.fetch_dhall()?;
- let typed = resolve_with_env(env, parsed)?.typecheck()?;
- let hir = typed.normalize().to_hir();
- let ty = typed.ty().clone();
+ let (hir, ty) = cache.caching_import(
+ import,
+ || location.fetch_dhall(),
+ |parsed| {
+ let typed =
+ resolve_with_env(env, cache, parsed)?.typecheck()?;
+ let hir = typed.normalize().to_hir();
+ Ok((hir, typed.ty))
+ },
+ )?;
match &import.hash {
Some(Hash::SHA256(hash)) => {
let actual_hash = hir.to_expr_alpha().hash()?;
@@ -346,19 +353,23 @@ fn traverse_resolve_expr(
fn resolve_with_env(
env: &mut ImportEnv,
+ cache: &Cache,
parsed: Parsed,
) -> Result<Resolved, Error> {
let Parsed(expr, location) = parsed;
let resolved = traverse_resolve_expr(
&mut NameEnv::new(),
&expr,
- &mut |import, span| resolve_one_import(env, &import, &location, span),
+ &mut |import, span| {
+ resolve_one_import(env, cache, &import, &location, span)
+ },
)?;
Ok(Resolved(resolved))
}
pub fn resolve(parsed: Parsed) -> Result<Resolved, Error> {
- resolve_with_env(&mut ImportEnv::new(), parsed)
+ let cache = Cache::new();
+ resolve_with_env(&mut ImportEnv::new(), &cache, parsed)
}
pub fn skip_resolve_expr(expr: &Expr) -> Result<Hir, Error> {
@@ -387,7 +398,6 @@ impl Canonicalize for FilePath {
// ───────────────────────────────────────
// canonicalize(directory₀/.) = directory₁
"." => continue,
-
".." => match file_path.last() {
// canonicalize(directory₀) = ε
// ────────────────────────────
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-27 06:29:48 +0000