Class: FortranSequential::Record

Inherits:
Object
  • Object
show all
Defined in:
ext/fortio/lib/fortio/fortran_sequential.rb

Instance Method Summary collapse

Constructor Details

#initialize(data = "", endian = "little", fmt = nil) ⇒ Record

Returns a new instance of Record.



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# File 'ext/fortio/lib/fortio/fortran_sequential.rb', line 93

def initialize (data="", endian="little", fmt=nil)
  @io = StringIO.new(data)
  @fmt = fmt
  @endian = endian
end

Instance Method Details

#empty? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'ext/fortio/lib/fortio/fortran_sequential.rb', line 103

def empty?
  return @io.eof?
end

#read(*fmts) ⇒ Object 



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# File 'ext/fortio/lib/fortio/fortran_sequential.rb', line 111

def read (*fmts)
  out = []
  while not fmts.empty?
    case fmt = fmts.shift
    when String
      list = []
      specs = fmt.scan(/(?:\d+|)(?:a\[\d+\]|\w)/)
      while not specs.empty?
        case specs.shift
        when /(\d+)?a\[(\d+)\]/
          ($1||1).to_i.times do 
            list.push(*@io.read($2.to_i).unpack("a#{$2}"))
          end
        when /(\d+)?a/
          ($1||1).to_i.times do 
            list.push(*@io.read(1).unpack("a"))
          end
        when /(\d+)?([dDEG])/
          ($1||1).to_i.times do 
            list.push(*@io.read(8).unpack(@fmt[$2]))
          end
        when /(\d+)?([lNVefFg])/
          ($1||1).to_i.times do 
            list.push(*@io.read(4).unpack(@fmt[$2]))
          end
        when /(\d+)?([nsv])/
          ($1||1).to_i.times do 
            list.push(*@io.read(2).unpack(@fmt[$2]))
          end
        else
          raise "invalid format for FortranSequential::Record#read"
        end
      end
      if list.size == 1
        out.push(list.first)
      else
        out.push(list)
      end
    when Integer
      n, tmpl = fmt, fmts.shift
      n.times do 
        out.push(tmpl.template.load_binary(@io))
      end
    when CArray
      tmpl = fmt
      if ENDIAN == @endian
        out.push(tmpl.template.load_binary(@io))
      else
        out.push(tmpl.template.load_binary(@io).swap_bytes!)
      end
    when CA::Struct
      if ENDIAN == @endian
        out.push(CScalar.new(fmt.class).load_binary(@io)[0])
      else
        out.push(CScalar.new(fmt.class).load_binary(@io).swap_bytes![0])
      end
    when Class
      if fmt < CA::Struct
        if ENDIAN == @endian
          out.push(CScalar.new(fmt).load_binary(@io)[0])
        else
          out.push(CScalar.new(fmt).load_binary(@io).swap_bytes![0])
        end
      else
        raise "invlaid argument (format string or CArray)"
      end
    else
      raise "invlaid argument (format string or CArray)"
    end 
  end
  if out.size == 1
    return out.first
  else
    return out
  end
end

#rest? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'ext/fortio/lib/fortio/fortran_sequential.rb', line 107

def rest?
  return (not @io.eof?)
end

#to_s ⇒ Object 



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# File 'ext/fortio/lib/fortio/fortran_sequential.rb', line 99

def to_s
  return @io.string
end

#write(*fmts) ⇒ Object 



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# File 'ext/fortio/lib/fortio/fortran_sequential.rb', line 188

def write (*fmts)
  while fmt = fmts.shift
    if fmt.is_a?(String)
      argv = fmts.shift
      unless argv.is_a?(Array)
        raise "argv should be array"
      end
      argv = argv.clone
    end
    case fmt
    when String
      specs = fmt.scan(/(?:\d+|)(?:a\[\d+\]|\w)/)
      while not specs.empty?
        case specs.shift
        when /(\d+)?a\[(\d+)\]/
          ($1||1).to_i.times do 
            @io.write [argv.shift].pack("a#{$2}")
          end
        when /(\d+)?([adDEGefFglNVnsv])/ 
          ($1||1).to_i.times do 
            @io.write [argv.shift].pack(@fmt[$2])
          end
        else
          raise "invalid format for FortranSequential::Record#write"
        end
      end
    when CArray
      if ENDIAN == @endian
        fmt.dump_binary(@io)
      else
        fmt.swap_bytes.dump_binary(@io)
      end
    when CA::Struct
      if RUBY_VERSION.to_f >= 1.9
        if ENDIAN == @endian
          @io.write fmt.encode.force_encoding("ASCII-8BIT")
        else
          @io.write fmt.swap_bytes.encode.force_encoding("ASCII-8BIT")
        end
      else
        if ENDIAN == @endian
          @io.write fmt.encode
        else
          @io.write fmt.swap_bytes.encode
        end
      end
    else
      raise "invlaid argument (format string or CArray)"
    end 
  end
end