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|
module Gem
# Gem::StubSpecification reads the stub: line from the gemspec
# This prevents us having to eval the entire gemspec in order to
# find out certain information.
class StubSpecification < BasicSpecification
# :nodoc:
PREFIX = "# stub: "
OPEN_MODE = # :nodoc:
if Object.const_defined? :Encoding then
'r:UTF-8:-'
else
'r'
end
# :nodoc:
class StubLine
attr_reader :parts
def initialize(data)
@parts = data[PREFIX.length..-1].split(" ")
end
def name
@parts[0]
end
def version
Gem::Version.new @parts[1]
end
def platform
Gem::Platform.new @parts[2]
end
def require_paths
@parts[3..-1].join(" ").split("\0")
end
end
def initialize(filename)
self.filename = filename
@data = nil
@spec = nil
end
##
# Name of the gem
def name
@name ||= data.name
end
##
# Version of the gem
def version
@version ||= data.version
end
##
# Platform of the gem
def platform
@platform ||= data.platform
end
##
# Require paths of the gem
def require_paths
@require_paths ||= data.require_paths
end
##
# The full Gem::Specification for this gem, loaded from evalling its gemspec
def to_spec
@spec ||= Gem::Specification.load(filename)
end
##
# True when this gem has been activated
def activated?
loaded = Gem.loaded_specs[name]
loaded && loaded.version == version
end
##
# Is this StubSpecification valid? i.e. have we found a stub line, OR does
# the filename contain a valid gemspec?
def valid?
data
end
private
##
# If the gemspec contains a stubline, returns a StubLine instance. Otherwise
# returns the full Gem::Specification.
def data
unless @data
open filename, OPEN_MODE do |file|
begin
file.readline # discard encoding line
stubline = file.readline.chomp
@data = StubLine.new(stubline) if stubline.start_with?(PREFIX)
rescue EOFError
end
end
end
@data ||= to_spec
end
end
end
|
