1 files changed, 267 insertions, 0 deletions

diff --git a/cli/lsp/jsr.rs b/cli/lsp/jsr.rs
index 27db4b0c8..52d48c115 100644
--- a/cli/lsp/jsr.rs
+++ b/cli/lsp/jsr.rs
@@ -1,20 +1,287 @@
 // Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
 
 use crate::args::jsr_api_url;
+use crate::args::jsr_url;
 use crate::file_fetcher::FileFetcher;
+use crate::jsr::partial_jsr_package_version_info_from_slice;
 use crate::jsr::JsrFetchResolver;
 use dashmap::DashMap;
+use deno_cache_dir::HttpCache;
 use deno_core::anyhow::anyhow;
 use deno_core::error::AnyError;
 use deno_core::serde_json;
+use deno_graph::packages::JsrPackageInfo;
+use deno_graph::packages::JsrPackageInfoVersion;
+use deno_graph::packages::JsrPackageVersionInfo;
+use deno_graph::ModuleSpecifier;
 use deno_runtime::deno_permissions::PermissionsContainer;
+use deno_semver::jsr::JsrPackageReqReference;
 use deno_semver::package::PackageNv;
+use deno_semver::package::PackageReq;
 use deno_semver::Version;
 use serde::Deserialize;
+use std::borrow::Cow;
+use std::collections::HashMap;
 use std::sync::Arc;
 
+use super::config::Config;
+use super::config::ConfigData;
 use super::search::PackageSearchApi;
 
+/// Keep in sync with `JsrFetchResolver`!
+#[derive(Debug)]
+pub struct JsrCacheResolver {
+  nv_by_req: DashMap<PackageReq, Option<PackageNv>>,
+  /// The `module_graph` fields of the version infos should be forcibly absent.
+  /// It can be large and we don't want to store it.
+  info_by_nv: DashMap<PackageNv, Option<Arc<JsrPackageVersionInfo>>>,
+  info_by_name: DashMap<String, Option<Arc<JsrPackageInfo>>>,
+  workspace_scope_by_name: HashMap<String, ModuleSpecifier>,
+  cache: Arc<dyn HttpCache>,
+}
+
+impl JsrCacheResolver {
+  pub fn new(
+    cache: Arc<dyn HttpCache>,
+    config_data: Option<&ConfigData>,
+    config: &Config,
+  ) -> Self {
+    let nv_by_req = DashMap::new();
+    let info_by_nv = DashMap::new();
+    let info_by_name = DashMap::new();
+    let mut workspace_scope_by_name = HashMap::new();
+    if let Some(config_data) = config_data {
+      let config_data_by_scope = config.tree.data_by_scope();
+      for member_scope in config_data.workspace_members.as_ref() {
+        let Some(member_data) = config_data_by_scope.get(member_scope) else {
+          continue;
+        };
+        let Some(package_config) = member_data.package_config.as_ref() else {
+          continue;
+        };
+        info_by_name.insert(
+          package_config.nv.name.clone(),
+          Some(Arc::new(JsrPackageInfo {
+            versions: [(
+              package_config.nv.version.clone(),
+              JsrPackageInfoVersion { yanked: false },
+            )]
+            .into_iter()
+            .collect(),
+          })),
+        );
+        info_by_nv.insert(
+          package_config.nv.clone(),
+          Some(Arc::new(JsrPackageVersionInfo {
+            exports: package_config.exports.clone(),
+            module_graph_1: None,
+            module_graph_2: None,
+            manifest: Default::default(),
+          })),
+        );
+        workspace_scope_by_name
+          .insert(package_config.nv.name.clone(), member_scope.clone());
+      }
+    }
+    if let Some(lockfile) = config_data.and_then(|d| d.lockfile.as_ref()) {
+      for (req_url, nv_url) in &lockfile.lock().content.packages.specifiers {
+        let Some(req) = req_url.strip_prefix("jsr:") else {
+          continue;
+        };
+        let Some(nv) = nv_url.strip_prefix("jsr:") else {
+          continue;
+        };
+        let Ok(req) = PackageReq::from_str(req) else {
+          continue;
+        };
+        let Ok(nv) = PackageNv::from_str(nv) else {
+          continue;
+        };
+        nv_by_req.insert(req, Some(nv));
+      }
+    }
+    Self {
+      nv_by_req,
+      info_by_nv,
+      info_by_name,
+      workspace_scope_by_name,
+      cache: cache.clone(),
+    }
+  }
+
+  pub fn req_to_nv(&self, req: &PackageReq) -> Option<PackageNv> {
+    if let Some(nv) = self.nv_by_req.get(req) {
+      return nv.value().clone();
+    }
+    let maybe_get_nv = || {
+      let name = req.name.clone();
+      let package_info = self.package_info(&name)?;
+      // Find the first matching version of the package which is cached.
+      let mut versions = package_info.versions.keys().collect::<Vec<_>>();
+      versions.sort();
+      let version = versions
+        .into_iter()
+        .rev()
+        .find(|v| {
+          if req.version_req.tag().is_some() || !req.version_req.matches(v) {
+            return false;
+          }
+          let nv = PackageNv {
+            name: name.clone(),
+            version: (*v).clone(),
+          };
+          self.package_version_info(&nv).is_some()
+        })
+        .cloned()?;
+      Some(PackageNv { name, version })
+    };
+    let nv = maybe_get_nv();
+    self.nv_by_req.insert(req.clone(), nv.clone());
+    nv
+  }
+
+  pub fn jsr_to_resource_url(
+    &self,
+    req_ref: &JsrPackageReqReference,
+  ) -> Option<ModuleSpecifier> {
+    let req = req_ref.req().clone();
+    let maybe_nv = self.req_to_nv(&req);
+    let nv = maybe_nv.as_ref()?;
+    let info = self.package_version_info(nv)?;
+    let path = info.export(&normalize_export_name(req_ref.sub_path()))?;
+    if let Some(workspace_scope) = self.workspace_scope_by_name.get(&nv.name) {
+      workspace_scope.join(path).ok()
+    } else {
+      jsr_url()
+        .join(&format!("{}/{}/{}", &nv.name, &nv.version, &path))
+        .ok()
+    }
+  }
+
+  pub fn lookup_export_for_path(
+    &self,
+    nv: &PackageNv,
+    path: &str,
+  ) -> Option<String> {
+    let info = self.package_version_info(nv)?;
+    let path = path.strip_prefix("./").unwrap_or(path);
+    let mut sloppy_fallback = None;
+    for (export, path_) in info.exports() {
+      let path_ = path_.strip_prefix("./").unwrap_or(path_);
+      if path_ == path {
+        return Some(export.strip_prefix("./").unwrap_or(export).to_string());
+      }
+      // TSC in some cases will suggest a `.js` import path for a `.d.ts` source
+      // file.
+      if sloppy_fallback.is_none() {
+        let path = path
+          .strip_suffix(".js")
+          .or_else(|| path.strip_suffix(".mjs"))
+          .or_else(|| path.strip_suffix(".cjs"))
+          .unwrap_or(path);
+        let path_ = path_
+          .strip_suffix(".d.ts")
+          .or_else(|| path_.strip_suffix(".d.mts"))
+          .or_else(|| path_.strip_suffix(".d.cts"))
+          .unwrap_or(path_);
+        if path_ == path {
+          sloppy_fallback =
+            Some(export.strip_prefix("./").unwrap_or(export).to_string());
+        }
+      }
+    }
+    sloppy_fallback
+  }
+
+  pub fn lookup_req_for_nv(&self, nv: &PackageNv) -> Option<PackageReq> {
+    for entry in self.nv_by_req.iter() {
+      let Some(nv_) = entry.value() else {
+        continue;
+      };
+      if nv_ == nv {
+        return Some(entry.key().clone());
+      }
+    }
+    None
+  }
+
+  pub fn package_info(&self, name: &str) -> Option<Arc<JsrPackageInfo>> {
+    if let Some(info) = self.info_by_name.get(name) {
+      return info.value().clone();
+    }
+    let read_cached_package_info = || {
+      let meta_url = jsr_url().join(&format!("{}/meta.json", name)).ok()?;
+      let meta_bytes = read_cached_url(&meta_url, &self.cache)?;
+      serde_json::from_slice::<JsrPackageInfo>(&meta_bytes).ok()
+    };
+    let info = read_cached_package_info().map(Arc::new);
+    self.info_by_name.insert(name.to_string(), info.clone());
+    info
+  }
+
+  pub fn package_version_info(
+    &self,
+    nv: &PackageNv,
+  ) -> Option<Arc<JsrPackageVersionInfo>> {
+    if let Some(info) = self.info_by_nv.get(nv) {
+      return info.value().clone();
+    }
+    let read_cached_package_version_info = || {
+      let meta_url = jsr_url()
+        .join(&format!("{}/{}_meta.json", &nv.name, &nv.version))
+        .ok()?;
+      let meta_bytes = read_cached_url(&meta_url, &self.cache)?;
+      partial_jsr_package_version_info_from_slice(&meta_bytes).ok()
+    };
+    let info = read_cached_package_version_info().map(Arc::new);
+    self.info_by_nv.insert(nv.clone(), info.clone());
+    info
+  }
+
+  pub fn did_cache(&self) {
+    self.nv_by_req.retain(|_, nv| nv.is_some());
+    self.info_by_nv.retain(|_, info| info.is_some());
+    self.info_by_name.retain(|_, info| info.is_some());
+  }
+}
+
+fn read_cached_url(
+  url: &ModuleSpecifier,
+  cache: &Arc<dyn HttpCache>,
+) -> Option<Vec<u8>> {
+  cache
+    .read_file_bytes(
+      &cache.cache_item_key(url).ok()?,
+      None,
+      deno_cache_dir::GlobalToLocalCopy::Disallow,
+    )
+    .ok()?
+}
+
+// TODO(nayeemrmn): This is duplicated from a private function in deno_graph
+// 0.65.1. Make it public or cleanup otherwise.
+fn normalize_export_name(sub_path: Option<&str>) -> Cow<str> {
+  let Some(sub_path) = sub_path else {
+    return Cow::Borrowed(".");
+  };
+  if sub_path.is_empty() || matches!(sub_path, "/" | ".") {
+    Cow::Borrowed(".")
+  } else {
+    let sub_path = if sub_path.starts_with('/') {
+      Cow::Owned(format!(".{}", sub_path))
+    } else if !sub_path.starts_with("./") {
+      Cow::Owned(format!("./{}", sub_path))
+    } else {
+      Cow::Borrowed(sub_path)
+    };
+    if let Some(prefix) = sub_path.strip_suffix('/') {
+      Cow::Owned(prefix.to_string())
+    } else {
+      sub_path
+    }
+  }
+}
+
 #[derive(Debug)]
 pub struct CliJsrSearchApi {
   file_fetcher: Arc<FileFetcher>,