class FFI::LibraryPath

def self.wrap(value)
  # We allow instances of LibraryPath to pass through transparently:
  return value if value.is_a?(self)
  # We special case a library named 'c' to be the standard C library:
  return Library::LIBC if value == 'c'
  # If provided a relative file name we convert it into a library path:
  if value && File.basename(value) == value
    return self.new(value)
  end
  # Otherwise, we assume it's a full path to a library:
  return value
end

def full_name
  # If the abi_number is given, we format it specifically according to platform rules:
  if abi_number
    if Platform.windows?
      "#{Platform::LIBPREFIX}#{name}-#{abi_number}.#{Platform::LIBSUFFIX}"
    elsif Platform.mac?
      "#{Platform::LIBPREFIX}#{name}.#{abi_number}.#{Platform::LIBSUFFIX}"
    else # Linux? BSD? etc.
      "#{Platform::LIBPREFIX}#{name}.#{Platform::LIBSUFFIX}.#{abi_number}"
    end
  else
    # Otherwise we just add prefix and suffix:
    lib = name
    # Add library prefix if missing
    lib = Platform::LIBPREFIX + lib unless lib =~ /^#{Platform::LIBPREFIX}/
    # Add library extension if missing
    r = Platform.windows? || Platform.mac? ? "\\.#{Platform::LIBSUFFIX}$" : "\\.so($|\\.[1234567890]+)"
    lib += ".#{Platform::LIBSUFFIX}" unless lib =~ /#{r}/
    lib
  end
end

def initialize(name, abi_number: nil, root: nil)
  @name = name
  @abi_number = abi_number
  @root = root
end

def to_s
  if root
    # If the root path is given, we generate the full path:
    File.join(root, full_name)
  else
    full_name
  end
end