diff options
Diffstat (limited to 'src/luarocks/core/manif.lua')
| -rw-r--r-- | src/luarocks/core/manif.lua | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/src/luarocks/core/manif.lua b/src/luarocks/core/manif.lua new file mode 100644 index 0000000..3925f63 --- /dev/null +++ b/src/luarocks/core/manif.lua @@ -0,0 +1,114 @@ + +--- Core functions for querying manifest files. +local manif = {} + +local persist = require("luarocks.core.persist") +local cfg = require("luarocks.core.cfg") +local dir = require("luarocks.core.dir") +local util = require("luarocks.core.util") +local vers = require("luarocks.core.vers") +local path = require("luarocks.core.path") +local require = nil +-------------------------------------------------------------------------------- + +-- Table with repository identifiers as keys and tables mapping +-- Lua versions to cached loaded manifests as values. +local manifest_cache = {} + +--- Cache a loaded manifest. +-- @param repo_url string: The repository identifier. +-- @param lua_version string: Lua version in "5.x" format, defaults to installed version. +-- @param manifest table: the manifest to be cached. +function manif.cache_manifest(repo_url, lua_version, manifest) + lua_version = lua_version or cfg.lua_version + manifest_cache[repo_url] = manifest_cache[repo_url] or {} + manifest_cache[repo_url][lua_version] = manifest +end + +--- Attempt to get cached loaded manifest. +-- @param repo_url string: The repository identifier. +-- @param lua_version string: Lua version in "5.x" format, defaults to installed version. +-- @return table or nil: loaded manifest or nil if cache is empty. +function manif.get_cached_manifest(repo_url, lua_version) + lua_version = lua_version or cfg.lua_version + return manifest_cache[repo_url] and manifest_cache[repo_url][lua_version] +end + +--- Back-end function that actually loads the manifest +-- and stores it in the manifest cache. +-- @param file string: The local filename of the manifest file. +-- @param repo_url string: The repository identifier. +-- @param lua_version string: Lua version in "5.x" format, defaults to installed version. +-- @return table or (nil, string, string): the manifest or nil, +-- error message and error code ("open", "load", "run"). +function manif.manifest_loader(file, repo_url, lua_version) + local manifest, err, errcode = persist.load_into_table(file) + if not manifest then + return nil, "Failed loading manifest for "..repo_url..": "..err, errcode + end + manif.cache_manifest(repo_url, lua_version, manifest) + return manifest, err, errcode +end + +--- Load a local manifest describing a repository. +-- This is used by the luarocks.loader only. +-- @param repo_url string: URL or pathname for the repository. +-- @return table or (nil, string, string): A table representing the manifest, +-- or nil followed by an error message and an error code, see manifest_loader. +function manif.fast_load_local_manifest(repo_url) + assert(type(repo_url) == "string") + + local cached_manifest = manif.get_cached_manifest(repo_url) + if cached_manifest then + return cached_manifest + end + + local pathname = dir.path(repo_url, "manifest") + return manif.manifest_loader(pathname, repo_url, nil, true) +end + +function manif.load_rocks_tree_manifests(deps_mode) + local trees = {} + path.map_trees(deps_mode, function(tree) + local manifest, err = manif.fast_load_local_manifest(path.rocks_dir(tree)) + if manifest then + table.insert(trees, {tree=tree, manifest=manifest}) + end + end) + return trees +end + +function manif.scan_dependencies(name, version, tree_manifests, dest) + if dest[name] then + return + end + dest[name] = version + + for _, tree in ipairs(tree_manifests) do + local manifest = tree.manifest + + local pkgdeps + if manifest.dependencies and manifest.dependencies[name] then + pkgdeps = manifest.dependencies[name][version] + end + if pkgdeps then + for _, dep in ipairs(pkgdeps) do + local pkg, constraints = dep.name, dep.constraints + + for _, t in ipairs(tree_manifests) do + local entries = t.manifest.repository[pkg] + if entries then + for ver, _ in util.sortedpairs(entries, vers.compare_versions) do + if (not constraints) or vers.match_constraints(vers.parse_version(ver), constraints) then + manif.scan_dependencies(pkg, ver, tree_manifests, dest) + end + end + end + end + end + return + end + end +end + +return manif |