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# frozen_string_literal: true
require "convert"
# Columnar conversion.
class Convert::Columnar < Convert
class << self
# Converts from YAML to Columnar format. This *always* converts to multiple
# files.
def from_yaml_to_columnar(from: nil, to: nil)
from_yaml(to_yaml_path(from))
.to_columnar(destination: to_data_path(to))
end
end
# Convert the data to multiple text files.
def to_columnar(options = {})
root = options[:destination] or require_destination!
@root = must_be_directory!(root)
@data = @loader.container.sort_by(&:simplified).map(&:to_h)
column_file("content_type") do |type|
[type["content-type"], Array(type["extensions"]).join(" ")]
.flatten.join(" ").strip
end
required_file("encoding")
option_file("pext", "preferred-extension")
option_file("docs")
bool_file("flags", "obsolete", "registered", "signature", "provisional")
dict_file("xrefs")
dict_file("friendly")
option_file("use_instead", "use-instead")
bin_file("spri", "sort-priority")
end
def bin_file(name, field = name)
File.binwrite(File.join(@root, "mime.#{name}.column"), @data.map { |type| type[field] }.pack("C*"))
end
def column_file(name, &block)
File.open(File.join(@root, "mime.#{name}.column"), "wb") do |f|
f.puts @data.map(&block)
end
end
def bool_file(name, *fields)
fields = [name] if fields.empty?
column_file(name) do |type|
fields.map { |field|
type[field] ? 1 : 0
}.join(" ")
end
end
def required_file(name, field = name)
column_file(name) { |type| type[field] }
end
def option_file(name, field = name)
column_file(name) { |type| opt(type[field]) }
end
def array_file(name, field = name)
column_file(name) { |type| arr(type[field]) }
end
def dict_file(name, field = name)
column_file(name) { |type| dict(type[field]) }
end
def opt(value)
value || "-"
end
def arr(value)
Array(opt(value)).join("|")
end
def dict(value)
if value
value.sort.map { |k, v|
[k, Array(v).compact.join("^")].join("^")
}.join("|")
else
"-"
end
end
end
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