class TagList < Array
def initialize(*args)
add(*args)
end
# Add tags to the tag_list. Duplicate or blank tags will be ignored.
#
# tag_list.add("Fun", "Happy")
#
# Use the <tt>:parse</tt> option to add an unparsed tag string.
#
# tag_list.add("Fun, Happy", :parse => true)
def add(*names)
extract_and_apply_options!(names)
concat(names)
clean!
self
end
# Remove specific tags from the tag_list.
#
# tag_list.remove("Sad", "Lonely")
#
# Like #add, the <tt>:parse</tt> option can be used to remove multiple tags in a string.
#
# tag_list.remove("Sad, Lonely", :parse => true)
def remove(*names)
extract_and_apply_options!(names)
delete_if { |name| names.include?(name) }
self
end
# Transform the tag_list into a tag string suitable for edting in a form.
# The tags are joined with <tt>TagList.delimiter</tt> and quoted if necessary.
#
# tag_list = TagList.new("Round", "Square,Cube")
# tag_list.to_s # 'Round, "Square,Cube"'
def to_s
clean!
map do |name|
name.include?(delimiter) ? "\"#{name}\"" : name
end.join(delimiter.ends_with?(" ") ? delimiter : "#{delimiter} ")
end
private
# Remove whitespace, duplicates, and blanks.
def clean!
reject!(&:blank?)
map!(&:strip)
uniq!
end
def extract_and_apply_options!(args)
options = args.last.is_a?(Hash) ? args.pop : {}
options.assert_valid_keys :parse
if options[:parse]
args.map! { |a| self.class.from(a) }
end
args.flatten!
end
class << self
# Returns a new TagList using the given tag string.
#
# tag_list = TagList.from("One , Two, Three")
# tag_list # ["One", "Two", "Three"]
def from(string)
returning new do |tag_list|
string = string.to_s.dup
# Parse the quoted tags
string.gsub!(/"(.*?)"\s*#{delimiter}?\s*/) { tag_list << $1; "" }
string.gsub!(/'(.*?)'\s*#{delimiter}?\s*/) { tag_list << $1; "" }
tag_list.add(string.split(delimiter))
end
end
def delimeter
', '
end
end
def delimeter
', '
end
end
