##
# We manage a set of attributes. Each attribute has a symbol name and a bit
# value.
class RDoc::Markup::Attributes
##
# The special attribute type. See RDoc::Markup#add_special
attr_reader :special
##
# Creates a new attributes set.
def initialize
@special = 1
@name_to_bitmap = [
[:_SPECIAL_, @special],
]
@next_bitmap = @special << 1
end
##
# Returns a unique bit for +name+
def bitmap_for name
bitmap = @name_to_bitmap.assoc name
unless bitmap then
bitmap = @next_bitmap
@next_bitmap <<= 1
@name_to_bitmap << [name, bitmap]
else
bitmap = bitmap.last
end
bitmap
end
##
# Returns a string representation of +bitmap+
def as_string bitmap
return 'none' if bitmap.zero?
res = []
@name_to_bitmap.each do |name, bit|
res << name if (bitmap & bit) != 0
end
res.join ','
end
##
# yields each attribute name in +bitmap+
def each_name_of bitmap
return enum_for __method__, bitmap unless block_given?
@name_to_bitmap.each do |name, bit|
next if bit == @special
yield name.to_s if (bitmap & bit) != 0
end
end
end
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