Class: CombinePDF::PDF

Inherits:
Object
  • Object
show all
Defined in:
lib/combine_pdf/combine_pdf_pdf.rb,
lib/combine_pdf/combine_pdf_pdf.rb

Overview

:nodoc: all

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(*args) ⇒ PDF

Returns a new instance of PDF.



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# File 'lib/combine_pdf/combine_pdf_pdf.rb', line 32

def initialize (*args)
  # default before setting
  @objects = []
  @version = 0 
  @info = {}
  if args[0].is_a? PDFParser
    @objects = args[0].parse
    @version = args[0].version if args[0].version.is_a? Float
    @info = args[0].info_object || {}
  elsif args[0].is_a? Array
    # object initialization
    @objects = args[0]
    @version = args[1] if args[1].is_a? Float
  elsif args[0].is_a? Hash
    @objects = args
  end
  # connecting references with original objects
  serialize_objects_and_references
  # general globals
  @string_output = :literal
  @need_to_rebuild_resources = false
  @set_start_id = 1
  @info[:Producer] = "Ruby CombinePDF Library by Boaz Segev"
  @info.delete :CreationDate
  @info.delete :ModDate
  warn "finished to initialize PDF object."
end

Instance Attribute Details

#info ⇒ Object (readonly)

Returns the value of attribute info.



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# File 'lib/combine_pdf/combine_pdf_pdf.rb', line 29

def info
  @info
end

#objects ⇒ Object (readonly)

Returns the value of attribute objects.



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# File 'lib/combine_pdf/combine_pdf_pdf.rb', line 29

def objects
  @objects
end

#string_output ⇒ Object

Returns the value of attribute string_output.



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# File 'lib/combine_pdf/combine_pdf_pdf.rb', line 30

def string_output
  @string_output
end

#version ⇒ Object

Returns the value of attribute version.



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# File 'lib/combine_pdf/combine_pdf_pdf.rb', line 31

def version
  @version
end

Instance Method Details

#<<(obj) ⇒ Object

this function adds pages or CombinePDF objects at the end of the file (merge) for example:

pdf = CombinePDF.new "first_file.pdf"

pdf << CombinePDF.new "second_file.pdf"

pdf.save "both_files_merged.pdf"



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# File 'lib/combine_pdf/combine_pdf_pdf.rb', line 171

def << (obj)
  #########
  ## how should we add data to PDF?
  ## and how to handles imported pages?
  case
   when (obj.is_a?(PDF))
    @version = [@version, obj.version].max

    obj.renumber_object_ids @set_start_id + @objects.length

    @objects.push(*obj.objects)
    # rebuild_catalog
    @need_to_rebuild_resources = true
   when (obj.is_a?(Hash) && obj[:Type] == :Page), (obj.is_a?(Array) && (obj.reject {|i| i.is_a?(Hash) && i[:Type] == :Page}).empty?)
     # set obj paramater to array if it's only one page
     obj = [obj] if obj.is_a?(Hash)
    # add page(s) to objects
    @objects.push(*obj)
    # add page dependencies to objects
    add_referenced(obj)
    # add page(s) to Catalog(s)
    rebuild_catalog obj
    @need_to_rebuild_resources = true
  when (obj.is_a?(Hash) && obj[:indirect_reference_id] && obj[:referenced_object].nil?)
    #only let top level indirect objects into the PDF tree.
    @objects << obj
    @need_to_rebuild_resources = true
  else
    warn "Shouldn't add objects to the file if they are not top-level indirect PDF objects."
  end
end

#add_referenced(object) ⇒ Object 



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# File 'lib/combine_pdf/combine_pdf_pdf.rb', line 291

def add_referenced(object)
  # add references but not root
  case 
  when object.is_a?(Array)
    object.each {|it| add_referenced(it)}
  when object.is_a?(Hash)
    if object[:is_reference_only] && object[:referenced_object]
      unless @objects.include? object[:referenced_object]
        @objects << object[:referenced_object]
        object[:referenced_object].each do |k, v|
          add_referenced(v) unless k == :Parent
        end           
      end
    else
      object.each do |k, v|
        add_referenced(v) unless k == :Parent 
      end
    end
  end
end

#all_indirect_object ⇒ Object 



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# File 'lib/combine_pdf/combine_pdf_pdf.rb', line 279

def all_indirect_object
  [].tap {|out| @objects.each {|obj| out << obj if (obj.is_a?(Hash) && obj[:is_reference_only].nil?) } }
end

#all_pages ⇒ Object

this function returns all the Page objects - regardless of order and even if not cataloged could be used for finding “lost” pages… but actually rather useless.



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# File 'lib/combine_pdf/combine_pdf_pdf.rb', line 206

def all_pages
  #########
  ## Only return the page item, but make sure all references are connected so that
  ## referenced items and be reached through the connections.
  [].tap {|out|  each_object {|obj| out << obj  if obj.is_a?(Hash) && obj[:Type] == :Page }  }
end

#compare_reference_values(obj, ref) ⇒ Object

the function rerturns true if the reference belongs to the object



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# File 'lib/combine_pdf/combine_pdf_pdf.rb', line 410

def compare_reference_values(obj, ref)
  if obj[:referenced_object] && ref[:referenced_object]
    return (obj[:referenced_object][:indirect_reference_id] == ref[:referenced_object][:indirect_reference_id] && obj[:referenced_object][:indirect_generation_number] == ref[:referenced_object][:indirect_generation_number])
  elsif ref[:referenced_object]
    return (obj[:indirect_reference_id] == ref[:referenced_object][:indirect_reference_id] && obj[:indirect_generation_number] == ref[:referenced_object][:indirect_generation_number])
  elsif obj[:referenced_object]
    return (obj[:referenced_object][:indirect_reference_id] == ref[:indirect_reference_id] && obj[:referenced_object][:indirect_generation_number] == ref[:indirect_generation_number])
  else
    return (obj[:indirect_reference_id] == ref[:indirect_reference_id] && obj[:indirect_generation_number] == ref[:indirect_generation_number])
  end
end

#each_object(&block) ⇒ Object

run block of code on evey object (Hash)



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# File 'lib/combine_pdf/combine_pdf_pdf.rb', line 406

def each_object(&block)
  PDFOperations._each_object(@objects, &block)
end

#pages(catalogs = nil) ⇒ Object

this method returns all the pages cataloged in the catalog.

if no catalog is passed, it seeks the existing catalog(s) and searches for any registered Page objects.

This method also adds the << operator to each page instance, so that content can be injected to the pages, as described above.

(page objects are Hash class objects. the << operator is added to the specific instances without changing the class)



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# File 'lib/combine_pdf/combine_pdf_pdf.rb', line 126

def pages(catalogs = nil)
  page_list = []
  if catalogs == nil
    catalogs = @objects.select {|obj| obj.is_a?(Hash) && obj[:Type] == :Catalog}
    catalogs ||= []
  end
  case 
  when catalogs.is_a?(Array)
    catalogs.each {|c| page_list.push *(pages(c)) unless c.nil?}
  when catalogs.is_a?(Hash)
    if catalogs[:is_reference_only]
      catalogs[:referenced_object] = pages(PDFOperations.get_refernced_object @objects, catalogs) unless catalogs[:referenced_object]
      if catalogs[:referenced_object]
        page_list.push *( pages(catalogs[:referenced_object]) )
      else
        warn "couldn't follow reference!!! #{catalogs} not found!"
      end
    else
      case catalogs[:Type]
      when :Page
        holder = self
        catalogs.define_singleton_method("<<".to_sym) do |obj|
          obj = PDFOperations.copy_and_secure_for_injection obj
          PDFOperations.inject_to_page self, obj
          holder.add_referenced obj
        end
        page_list << catalogs
      when :Pages
        page_list.push *(pages(catalogs[:Kids])) unless catalogs[:Kids].nil?
      when :Catalog
        page_list.push *(pages(catalogs[:Pages])) unless catalogs[:Pages].nil?
      end
    end
  end
  page_list
end

#rebuild_catalog(*with_pages) ⇒ Object 



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# File 'lib/combine_pdf/combine_pdf_pdf.rb', line 311

def rebuild_catalog(*with_pages)
  ##########################
  ## Test-Run - How is that done?
  warn "Re-Building Catalog"

  # # build page list v.1 Slow but WORKS
  # # Benchmark testing value: 26.708394
  # old_catalogs = @objects.select {|obj| obj.is_a?(Hash) && obj[:Type] == :Catalog}
  # old_catalogs ||= []
  # page_list = []
  # PDFOperations._each_object(old_catalogs,false) { |p| page_list << p if p.is_a?(Hash) && p[:Type] == :Page }

  # build page list v.2
  # Benchmark testing value: 0.215114
  page_list = pages

  # add pages to catalog, if requested
  page_list.push(*with_pages) unless with_pages.empty?

  # build new Pages object
  pages_object = {Type: :Pages, Count: page_list.length, Kids: page_list.map {|p| {referenced_object: p, is_reference_only: true} } }

  # build new Catalog object
  catalog_object = {Type: :Catalog, Pages: {referenced_object: pages_object, is_reference_only: true} }

  # point old Pages pointers to new Pages object
  ## first point known pages objects - enough?
  pages.each {|p| p[:Parent] = { referenced_object: pages_object, is_reference_only: true} }
  ## or should we, go over structure? (fails)
  # each_object {|obj| obj[:Parent][:referenced_object] = pages_object if obj.is_a?(Hash) && obj[:Parent].is_a?(Hash) && obj[:Parent][:referenced_object] && obj[:Parent][:referenced_object][:Type] == :Pages}

  # remove old catalog and pages objects
  @objects.reject! {|obj| obj.is_a?(Hash) && (obj[:Type] == :Catalog || obj[:Type] == :Pages) }

  # inject new catalog and pages objects
  @objects << pages_object
  @objects << catalog_object

  catalog_object
end

#rebuild_catalog_and_objects ⇒ Object

this is an alternative to the rebuild_catalog catalog method this method is used by the to_pdf method, for streamlining the PDF output. there is no point is calling the method before preparing the output.



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# File 'lib/combine_pdf/combine_pdf_pdf.rb', line 354

def rebuild_catalog_and_objects
  catalog = rebuild_catalog
  @objects = []
  @objects << catalog
  add_referenced catalog
  renumber_object_ids
  catalog
end

#rebuild_resources ⇒ Object

disabled, don’t use. simpley returns true.



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# File 'lib/combine_pdf/combine_pdf_pdf.rb', line 364

def rebuild_resources

  warn "Resources re-building disabled as it isn't worth the price in peformance as of yet."

  return true

  warn "Re-Building Resources"
  @need_to_rebuild_resources = false
  # what are resources?
  # anything at the top level of the file exept catalogs, page lists (Pages) and pages...
  not_resources = [:Catalog, :Pages, :Page]
  # get old resources list
  old_resources = @objects.select {|obj| obj.is_a?(Hash) && !not_resources.include?(obj[:Type])}
  # collect all unique resources while ignoring double values and resetting references
  # also ignore inner values (canot use PRIVATE_HASH_KEYS because of stream and other issues)
  ignore_keys = [:indirect_reference_id, :indirect_generation_number, :is_reference_only, :referenced_object]
  new_resources = []
  all_references = references
  old_resources.each do |old_r|
    add = true
    new_resources.each do |new_r|
      # ## v.1.0 - slower
      # if (old_r.reject {|k,v| ignore_keys.include?(k) }) == (new_r.reject {|k,v| ignore_keys.include?(k)})
      #  all_references.each {|ref| ref[:referenced_object] = new_r if ref[:referenced_object].object_id == old_r.object_id }  # fails, but doesn't assume all references are connected: compare_reference_values(old_r, ref) }
      #  add = false
      # end
      ## v.1.1 - faster, doesn't build two hashes (but iterates one)
      if ( [].tap {|out| old_r.each {|k,v| out << true unless ((!ignore_keys.include?(k)) && new_r[k] == v) } } .empty?)
        all_references.each {|ref| ref[:referenced_object] = new_r if ref[:referenced_object].object_id == old_r.object_id }  # fails, but doesn't assume all references are connected: compare_reference_values(old_r, ref) }
        add = false
      end
    end
    new_resources << old_r if add
  end
  # remove old resources
  @objects.reject! {|obj| old_resources.include?(obj)}
  # insert new resources
  @objects.push *new_resources
  # rebuild stream lengths?
end

#references(indirect_reference_id = nil, indirect_generation_number = nil) ⇒ Object 



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# File 'lib/combine_pdf/combine_pdf_pdf.rb', line 265

def references(indirect_reference_id = nil, indirect_generation_number = nil)
  ref = {indirect_reference_id: indirect_reference_id, indirect_generation_number: indirect_generation_number}
  out = []
  each_object do |obj|
    if obj[:is_reference_only]
      if (indirect_reference_id == nil && indirect_generation_number == nil)
        out << obj 
      elsif compare_reference_values(ref, obj)
        out << obj 
      end
    end
  end
  out
end

#renumber_object_ids(start = nil) ⇒ Object 



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# File 'lib/combine_pdf/combine_pdf_pdf.rb', line 253

def renumber_object_ids(start = nil)
  warn "Resetting Object Reference IDs"
  @set_start_id ||= start
  start = @set_start_id
  history = {}
  all_indirect_object.each do |obj|
    obj[:indirect_reference_id] = start
    start += 1
  end
  warn "Finished serializing IDs"
end

#save(file_name) ⇒ Object

Seve the PDF to file.

file_name

is a string or path object for the output.

Notice! if the file exists, it WILL be overwritten.



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# File 'lib/combine_pdf/combine_pdf_pdf.rb', line 114

def save(file_name)
  IO.binwrite file_name, to_pdf
end

#serialize_objects_and_references(object = nil) ⇒ Object 



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# File 'lib/combine_pdf/combine_pdf_pdf.rb', line 212

def serialize_objects_and_references(object = nil)
  warn "connecting objects with their references (serialize_objects_and_references)."

  # # Version 3.5 injects indirect objects if they arn't dictionaries.
  # # benchmark 1000.times was 3.568246 sec for pdf = CombinePDF.new "/Users/2Be/Desktop/מוצגים/20121002\ הודעת\ הערעור.pdf" }
  # # puts Benchmark.measure { 1000.times {pdf.serialize_objects_and_references} }
  # # ######### Intreduces a BUG with catalogging pages... why? I don't know... mybey doesn't catch all.
  # each_object do |obj|
  #  obj.each do |k, v|
  #    if v.is_a?(Hash) && v[:is_reference_only]
  #      v[:referenced_object] = PDFOperations.get_refernced_object @objects, v
  #      raise "couldn't connect references" unless v[:referenced_object]
  #      obj[k] = v[:referenced_object][:indirect_without_dictionary] if v[:referenced_object][:indirect_without_dictionary]
  #    end
  #  end
  # end

  # Version 4
  # benchmark 1000.times was 0.980651 sec for:
  # pdf = CombinePDF.new "/Users/2Be/Desktop/מוצגים/20121002\ הודעת\ הערעור.pdf"
  # puts Benchmark.measure { 1000.times {pdf.serialize_objects_and_references} }
  objects_reference_hash = {}
  @objects.each {|o| objects_reference_hash[ [o[:indirect_reference_id], o[:indirect_generation_number] ] ] = o }
  each_object do |obj|
    if obj[:is_reference_only]
      obj[:referenced_object] = objects_reference_hash[ [obj[:indirect_reference_id], obj[:indirect_generation_number] ]   ]
      warn "couldn't connect a reference!!! could be a null object, Silent error!!!" unless obj[:referenced_object]
    end
  end

  # # Version 3
  # # benchmark 1000.times was 3.568246 sec for pdf = CombinePDF.new "/Users/2Be/Desktop/מוצגים/20121002\ הודעת\ הערעור.pdf" }
  # # puts Benchmark.measure { 1000.times {pdf.serialize_objects_and_references} }
  # each_object do |obj|
  #  if obj[:is_reference_only]
  #    obj[:referenced_object] = PDFOperations.get_refernced_object @objects, obj
  #    warn "couldn't connect a reference!!! could be a null object, Silent error!!!" unless obj[:referenced_object]
  #  end
  # end

end

#sort_objects_by_id ⇒ Object 



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# File 'lib/combine_pdf/combine_pdf_pdf.rb', line 282

def sort_objects_by_id
  @objects.sort! do |a,b|
    if a.is_a?(Hash) && a[:indirect_reference_id] && a[:is_reference_only].nil? && b.is_a?(Hash) && b[:indirect_reference_id] && b[:is_reference_only].nil?
      return a[:indirect_reference_id] <=> b[:indirect_reference_id]
    end
    0
  end
end

#to_pdf ⇒ Object

Formats the data to PDF formats and returns a binary string that represents the PDF file content.

This method is used by the save(file_name) method to save the content to a file.

use this to export the PDF file without saving to disk (such as sending through HTTP ect’).



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# File 'lib/combine_pdf/combine_pdf_pdf.rb', line 65

def to_pdf
  #reset version if not specified
  @version = 1.3 if @version == 0
  #set creation date for merged file
  @info[:CreationDate] = Time.now.strftime "D:%Y%m%d%H%M%S%:::z'00"
  #rebuild resources if needed
  if @need_to_rebuild_resources
    rebuild_resources
  end
  catalog = rebuild_catalog_and_objects #rebuild_catalog

  warn "Formatting PDF output"

  out = []
  xref = []
  indirect_object_count = 1 #the first object is the null object
  #write head (version and binanry-code)
  out << "%PDF-#{@version.to_s}\n%\x00\x00\x00\x00".force_encoding(Encoding::ASCII_8BIT)

  #collect objects and set xref table locations
  loc = 0
  out.each {|line| loc += line.bytes.length + 1}
  @objects.each do |o|
    indirect_object_count += 1
    xref << loc
    out << PDFOperations._object_to_pdf(o)
    loc += out.last.length + 1
  end
  warn "Building XREF"
  xref_location = 0
  out.each { |line| xref_location += line.bytes.length + 1}
  out << "xref\n\r0 #{(indirect_object_count).to_s}\n\r0000000000 65535 f \n\r"
  xref.each {|offset| out << ( out.pop + ("%010d 00000 n \n\r" % offset) ) }
  out << out.pop + "trailer"
  out << "<<\n/Root #{false || "#{catalog[:indirect_reference_id]} #{catalog[:indirect_generation_number]} R"}"
  out << "/Size #{indirect_object_count.to_s}"
  if @info.is_a?(Hash)
    PRIVATE_HASH_KEYS.each {|key| @info.delete key} # make sure the dictionary is rendered inline, without stream
    out << "/Info #{PDFOperations._object_to_pdf @info}"
  end
  out << ">>\nstartxref\n#{xref_location.to_s}\n%%EOF"
  out.join("\n").force_encoding(Encoding::ASCII_8BIT)
end