class Bundler::CompactIndexClient::Cache

# File bundler/compact_index_client/cache.rb, line 10
def initialize(directory)
  @directory = Pathname.new(directory).expand_path
  info_roots.each {|dir| mkdir(dir) }
  mkdir(info_etag_root)
end

# File bundler/compact_index_client/cache.rb, line 57
def checksums
  lines(versions_path).each_with_object({}) do |line, checksums|
    parse_version_checksum(line, checksums)
  end
end

# File bundler/compact_index_client/cache.rb, line 63
def dependencies(name)
  lines(info_path(name)).map do |line|
    parse_gem(line)
  end
end

# File bundler/compact_index_client/cache.rb, line 79
def info_etag_path(name)
  name = name.to_s
  info_etag_root.join("#{name}-#{SharedHelpers.digest(:MD5).hexdigest(name).downcase}")
end

# File bundler/compact_index_client/cache.rb, line 69
def info_path(name)
  name = name.to_s
  if /[^a-z0-9_-]/.match?(name)
    name += "-#{SharedHelpers.digest(:MD5).hexdigest(name).downcase}"
    info_roots.last.join(name)
  else
    info_roots.first.join(name)
  end
end

# File bundler/compact_index_client/cache.rb, line 16
def names
  lines(names_path)
end

# File bundler/compact_index_client/cache.rb, line 24
def names_etag_path
  directory.join("names.etag")
end

# File bundler/compact_index_client/cache.rb, line 20
def names_path
  directory.join("names")
end

# File bundler/compact_index_client/cache.rb, line 28
def versions
  versions_by_name = Hash.new {|hash, key| hash[key] = [] }
  info_checksums_by_name = {}

  lines(versions_path).each do |line|
    name, versions_string, info_checksum = line.split(" ", 3)
    info_checksums_by_name[name] = info_checksum || ""
    versions_string.split(",") do |version|
      delete = version.delete_prefix!("-")
      version = version.split("-", 2).unshift(name)
      if delete
        versions_by_name[name].delete(version)
      else
        versions_by_name[name] << version
      end
    end
  end

  [versions_by_name, info_checksums_by_name]
end

# File bundler/compact_index_client/cache.rb, line 53
def versions_etag_path
  directory.join("versions.etag")
end

# File bundler/compact_index_client/cache.rb, line 49
def versions_path
  directory.join("versions")
end

# File bundler/compact_index_client/cache.rb, line 125
def info_etag_root
  directory.join("info-etags")
end

# File bundler/compact_index_client/cache.rb, line 118
def info_roots
  [
    directory.join("info"),
    directory.join("info-special-characters"),
  ]
end

# File bundler/compact_index_client/cache.rb, line 92
def lines(path)
  return [] unless path.file?
  lines = SharedHelpers.filesystem_access(path, :read, &:read).split("\n")
  header = lines.index("---")
  header ? lines[header + 1..-1] : lines
end

# File bundler/compact_index_client/cache.rb, line 86
def mkdir(dir)
  SharedHelpers.filesystem_access(dir) do
    FileUtils.mkdir_p(dir)
  end
end

# File bundler/compact_index_client/cache.rb, line 99
def parse_gem(line)
  @dependency_parser ||= GemParser.new
  @dependency_parser.parse(line)
end

# File bundler/compact_index_client/cache.rb, line 106
def parse_version_checksum(line, checksums)
  line.freeze # allows slicing into the string to not allocate a copy of the line
  name_end = line.index(" ")
  checksum_start = line.index(" ", name_end + 1) + 1
  checksum_end = line.size - checksum_start
  # freeze name since it is used as a hash key
  # pre-freezing means a frozen copy isn't created
  name = line[0, name_end].freeze
  checksum = line[checksum_start, checksum_end]
  checksums[name] = checksum
end