Class: PdfInfo::Metadata

Inherits:
Object
  • Object
show all
Defined in:
lib/pdf_info.rb

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(path) ⇒ Metadata

Returns a new instance of Metadata.



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# File 'lib/pdf_info.rb', line 19

def initialize(path)
  @stdout = []
  Open3.popen2e(Settings.binaries.pdfinfo, path) do |_stdin, stdout, wait|
    stdout.each_line do |line|
      @stdout.push(force_utf8_encoding(line))
    end
    @exit_status = wait.value
  end
  init_error unless @exit_status.success?
end

Class Method Details

.read(file_or_path) ⇒ Object 



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# File 'lib/pdf_info.rb', line 11

def self.read(file_or_path)
  if file_or_path.is_a? String
    new(file_or_path)
  else
    new(file_or_path.path)
  end
end

Instance Method Details

#[](key) ⇒ Object 



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# File 'lib/pdf_info.rb', line 30

def [](key)
  @internal_hash ||= parse_result
  @internal_hash[key]
rescue => e
  raise PdfInfo::MetadataReadError.new(-1, e.message)
end

#convert_pts_to_inches(dimension) ⇒ Object (private) 



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# File 'lib/pdf_info.rb', line 64

def convert_pts_to_inches(dimension)
  dimension / 72.0
end

#encrypted? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/pdf_info.rb', line 37

def encrypted?
  self['Encrypted'] != 'no'
end

#file_size ⇒ Object 



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# File 'lib/pdf_info.rb', line 58

def file_size
  self['File size'].scan(/\d+/).first.to_i
end

#force_utf8_encoding(str) ⇒ Object (private) 



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# File 'lib/pdf_info.rb', line 72

def force_utf8_encoding(str)
  return str if str.valid_encoding?

  reencoded_str = str.encode(Encoding::UTF_16, invalid: :replace, undef: :replace, replace: '')
  reencoded_str.encode!(Encoding::UTF_8)
end

#init_error ⇒ Object (private)

Raises:



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# File 'lib/pdf_info.rb', line 68

def init_error
  raise PdfInfo::MetadataReadError.new(@exit_status.exitstatus, @stdout.join('\n'))
end

#page_size ⇒ Object 



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# File 'lib/pdf_info.rb', line 45

def page_size
  width, height = self['Page size'].scan(/\d+/).map(&:to_i)
  { width:, height: }
end

#page_size_inches ⇒ Object 



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# File 'lib/pdf_info.rb', line 50

def page_size_inches
  in_pts = page_size
  {
    height: convert_pts_to_inches(in_pts[:height]),
    width: convert_pts_to_inches(in_pts[:width])
  }
end

#pages ⇒ Object 



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# File 'lib/pdf_info.rb', line 41

def pages
  self['Pages'].to_i
end

#parse_result ⇒ Object (private) 



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# File 'lib/pdf_info.rb', line 79

def parse_result
  @stdout.each_with_object({}) do |line, out|
    key, value = line.split(/:\s+/)
    out[key.strip] = value.try(:strip)
  end
end