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# frozen_string_literal: true
module PDF
module Core
# PDF object repository
#
# @api private
class ObjectStore
include Enumerable
# Minimum PDF version
# @return [Float]
attr_reader :min_version
# @param opts [Hash]
# @option opts :info [Hash] Documnt info dict
# @option opts :print_scaling [:none, nil] (nil) Print scaling viewer
# option
def initialize(opts = {})
@objects = {}
@identifiers = []
@info ||= ref(opts[:info] || {}).identifier
@root ||= ref(Type: :Catalog).identifier
if opts[:print_scaling] == :none
root.data[:ViewerPreferences] = { PrintScaling: :None }
end
if pages.nil?
root.data[:Pages] = ref(Type: :Pages, Count: 0, Kids: [])
end
end
# Wrap an object into a reference.
#
# @param data [Hash, Array, Numeric, String, Symbol, Date, Time, nil]
# object data
# @return [Reference]
def ref(data)
push(size + 1, data)
end
# Document info dict reference
#
# @return [Reference]
def info
@objects[@info]
end
# Document root dict reference
#
# @return [Reference]
def root
@objects[@root]
end
# Document pages reference
#
# @return [Reference]
def pages
root.data[:Pages]
end
# Number of pages in the document
#
# @return [Integer]
def page_count
pages.data[:Count]
end
# Adds the given reference to the store and returns the reference object.
# If the object provided is not a PDF::Core::Reference, one is created
# from the arguments provided.
#
# @overload push(reference)
# @param reference [Reference]
# @return [reference]
# @overload push(id, data)
# @param id [Integer] reference identifier
# @param data [Hash, Array, Numeric, String, Symbol, Date, Time, nil]
# object data
# @return [Reference] - the added reference
def push(*args)
reference =
if args.first.is_a?(PDF::Core::Reference)
args.first
else
PDF::Core::Reference.new(*args)
end
@objects[reference.identifier] = reference
@identifiers << reference.identifier
reference
end
alias << push
# Iterate over document object references.
#
# @yieldparam ref [Reference]
# @return [void]
def each
@identifiers.each do |id|
yield(@objects[id])
end
end
# Get object reference by its identifier.
#
# @param id [Integer] object identifier
# @return [Reference]
def [](id)
@objects[id]
end
# Number of object references in the document.
#
# @return [Integer]
def size
@identifiers.size
end
alias length size
# Get page reference identifier by page number.Pages are indexed starting
# at 1 (**not 0**).
#
# @example
# !!!ruby
# object_id_for_page(1)
# #=> 5
# object_id_for_page(10)
# #=> 87
# object_id_for_page(-11)
# #=> 17
#
# @param page [Integer] page number
# @return [Integer] page object identifier
def object_id_for_page(page)
page -= 1 if page.positive?
flat_page_ids = get_page_objects(pages).flatten
flat_page_ids[page]
end
private
# returns an array with the object IDs for all pages
def get_page_objects(pages)
pages.data[:Kids].map(&:identifier)
end
end
end
end
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