Class: ChemScanner::ChemDraw::CdxReader

Inherits:
Object
  • Object
show all
Defined in:
lib/chem_scanner/chem_draw/cdx_reader.rb

Overview

Class which traverse the tree in CDX binary files

Constant Summary collapse

HEADER_STRING_LEN = 
8
HEADER_STRING = 
"VjCD0100"
HEADER_LENGTH = 
28
TAG_OBJECT = 
0x8000

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(file, is_path) ⇒ CdxReader

Returns a new instance of CdxReader.



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# File 'lib/chem_scanner/chem_draw/cdx_reader.rb', line 14

def initialize(file, is_path)
  @ids = []
  @depth = 0

  @bin = is_path ? IO.binread(file) : file

  if @bin[0, HEADER_STRING_LEN] == HEADER_STRING
    @iter = HEADER_LENGTH
    @valid = true
  else
    @valid = false
  end
end

Instance Attribute Details

#bin ⇒ Object (readonly)

Returns the value of attribute bin.



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# File 'lib/chem_scanner/chem_draw/cdx_reader.rb', line 12

def bin
  @bin
end

#cur_tag ⇒ Object (readonly)

Returns the value of attribute cur_tag.



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# File 'lib/chem_scanner/chem_draw/cdx_reader.rb', line 12

def cur_tag
  @cur_tag
end

#depth ⇒ Object (readonly)

Returns the value of attribute depth.



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# File 'lib/chem_scanner/chem_draw/cdx_reader.rb', line 12

def depth
  @depth
end

#iter ⇒ Object (readonly)

Returns the value of attribute iter.



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# File 'lib/chem_scanner/chem_draw/cdx_reader.rb', line 12

def iter
  @iter
end

#len ⇒ Object (readonly)

Returns the value of attribute len.



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# File 'lib/chem_scanner/chem_draw/cdx_reader.rb', line 12

def len
  @len
end

#valid ⇒ Object (readonly)

Returns the value of attribute valid.



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# File 'lib/chem_scanner/chem_draw/cdx_reader.rb', line 12

def valid
  @valid
end

Instance Method Details

#current_id ⇒ Object 



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# File 'lib/chem_scanner/chem_draw/cdx_reader.rb', line 78

def current_id
  @ids.last
end

#data ⇒ Object 



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# File 'lib/chem_scanner/chem_draw/cdx_reader.rb', line 82

def data
  @buf.dup
end

#end? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/chem_scanner/chem_draw/cdx_reader.rb', line 28

def end?
  @iter > @bin.size
end

#ignore_object ⇒ Object

rubocop:enable Metrics/PerceivedComplexity



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# File 'lib/chem_scanner/chem_draw/cdx_reader.rb', line 74

def ignore_object
  read_next(true, @depth - 1)
end

#read(objects_only = false, target_depth = -2)) ⇒ Object

rubocop:disable Metrics/PerceivedComplexity



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# File 'lib/chem_scanner/chem_draw/cdx_reader.rb', line 38

def read(objects_only = false, target_depth = -2)
  while @iter <= @bin.size
    tag = read_int16

    return -1 if tag.nil?

    if tag.zero?
      if @depth.zero?
        @iter = @bin.size
        return 0
      end
      @depth -= 1
      @ids.pop

      return 0 if target_depth.negative? || @depth == target_depth
    elsif (tag & TAG_OBJECT).nonzero?
      @ids.push(read_int32)
      @depth += 1

      return tag if target_depth.negative? || @depth - 1 == target_depth
    else
      @len = read_int16
      unless objects_only
        @buf = @bin[@iter, @len]
        @iter += @len

        return tag
      end

      @iter += @len
    end
  end
  0
end

#read_next(objects_only = false, target_depth = -2)) ⇒ Object 



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# File 'lib/chem_scanner/chem_draw/cdx_reader.rb', line 32

def read_next(objects_only = false, target_depth = -2)
  @cur_tag = read(objects_only, target_depth)
  @cur_tag
end