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# frozen_string_literal: true
require "mime/type/columnar"
# MIME::Types::Columnar is used to extend a MIME::Types container to load data
# by columns instead of from JSON or YAML. Column loads of MIME types loaded
# through the columnar store are synchronized with a Mutex.
#
# MIME::Types::Columnar is not intended to be used directly, but will be added
# to an instance of MIME::Types when it is loaded with
# MIME::Types::Loader#load_columnar.
module MIME::Types::Columnar
LOAD_MUTEX = Mutex.new # :nodoc:
def self.extended(obj) # :nodoc:
super
obj.instance_variable_set(:@__mime_data__, [])
obj.instance_variable_set(:@__files__, Set.new)
end
# Load the first column data file (type and extensions).
def load_base_data(path) # :nodoc:
@__root__ = path
each_file_line("content_type", false) do |line|
line = line.split
content_type = line.shift
extensions = line
# content_type, *extensions = line.split
type = MIME::Type::Columnar.new(self, content_type, extensions)
@__mime_data__ << type
add(type)
end
self
end
private
def each_file_line(name, lookup = true)
LOAD_MUTEX.synchronize do
next if @__files__.include?(name)
i = -1
column = File.join(@__root__, "mime.#{name}.column")
IO.readlines(column, encoding: "UTF-8").each do |line|
line.chomp!
if lookup
(type = @__mime_data__[i += 1]) || next
yield type, line
else
yield line
end
end
@__files__ << name
end
end
def load_encoding
each_file_line("encoding") do |type, line|
pool ||= {}
type.instance_variable_set(:@encoding, (pool[line] ||= line))
end
end
def load_docs
each_file_line("docs") do |type, line|
type.instance_variable_set(:@docs, opt(line))
end
end
def load_preferred_extension
each_file_line("pext") do |type, line|
type.instance_variable_set(:@preferred_extension, opt(line))
end
end
def load_flags
each_file_line("flags") do |type, line|
line = line.split
type.instance_variable_set(:@obsolete, flag(line.shift))
type.instance_variable_set(:@registered, flag(line.shift))
type.instance_variable_set(:@signature, flag(line.shift))
type.instance_variable_set(:@provisional, flag(line.shift))
end
end
def load_xrefs
each_file_line("xrefs") { |type, line|
type.instance_variable_set(:@xrefs, dict(line, array: true))
}
end
def load_friendly
each_file_line("friendly") { |type, line|
type.instance_variable_set(:@friendly, dict(line))
}
end
def load_use_instead
each_file_line("use_instead") do |type, line|
type.instance_variable_set(:@use_instead, opt(line))
end
end
def dict(line, array: false)
if line == "-"
{}
else
line.split("|").each_with_object({}) { |l, h|
k, v = l.split("^")
v = nil if v.empty?
h[k] = array ? Array(v) : v
}
end
end
def arr(line)
if line == "-"
[]
else
line.split("|").flatten.compact.uniq
end
end
def opt(line)
line unless line == "-"
end
def flag(line)
line == "1"
end
end
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