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class TagList < Array
cattr_accessor :delimiter
self.delimiter = ','
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
# Toggle the presence of the given tags.
# If a tag is already in the list it is removed, otherwise it is added.
def toggle(*names)
extract_and_apply_options!(names)
names.each do |name|
include?(name) ? delete(name) : push(name)
end
clean!
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(source)
tag_list = new
case source
when Array
tag_list.add(source)
else
string = source.to_s.dup
# Parse the quoted tags
[
/\s*#{delimiter}\s*(['"])(.*?)\1\s*/,
/^\s*(['"])(.*?)\1\s*#{delimiter}?/
].each do |re|
string.gsub!(re) { tag_list << $2; "" }
end
tag_list.add(string.split(delimiter))
end
tag_list
end
end
end
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