Class MergedSignatureSource

The classes a package version declares and the relations between them (superclasses, slot types, virtual, union) -- LibraryExports.s4Classes, a flat name list, has nowhere to hang this; version defaults to the newest.

The package OWNING class className (S3: LibraryExports.s3Classes; S4: LibraryExports.s4Classes; S3 wins ties). With a version, every candidate package is scanned at it instead of using the cached reverse index.

release any held file handles

for a base package, the R versions it was part of core (ascending); undefined otherwise

Declared dependencies (Depends, Imports, ...) of a package version, with version qualifiers; version defaults to the newest.

how often the package was downloaded when the database was built, the popularity SigDbPkgMeta records

The rich view of a single named function, decoding only it (unlike functions); version defaults to the newest.

Rich per-function view (signatures and call graphs) of a package version; version defaults to the newest.

whether the source can resolve the package at all

whether the source actually carries the given version of a package (not just the package itself)

whether the package is an R-core / base package (its versions are the R releases it shipped with)

whether a version is a current CRAN release (i.e. not in the package's noncran/removed set)

the newest version of a package by release date (falling back to the recorded latest, then SemVer order)

The export view of a package version; version defaults to the database's newest if omitted.

every package name this source can resolve

The packages exporting name, ordered by downloads (descending, ties by name); answered without a reverse index, since a name the database never stores is rejected outright and only blobs that may hold it are decoded.

The release date of a package version, undefined if unknown. Omitted, version defaults to the newest release by recorded date (unlike the queries above, which default to the package's recorded latest).

every known release of a package (version + date), ascending by R-version order

the repository a version came from, undefined in bundles that record none

Transitive callees of a function within one package version, expanding the stored local call graphs; version defaults to the newest.