Module: CmpFS::Compare::Text::Internal_

Defined in:
lib/cmpfs/compare/text/internal_.rb

Class Method Summary collapse

Class Method Details

.compare_text_(lhs, rhs, options) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/cmpfs/compare/text/internal_.rb', line 102

def self.compare_text_ lhs, rhs, options

  lhs_type  = self.determine_param_type_ lhs
  rhs_type  = self.determine_param_type_ rhs

  raise ArgumentError, "lhs is of unsupported type '#{lhs.class}'" unless lhs_type
  raise ArgumentError, "rhs is of unsupported type '#{rhs.class}'" unless rhs_type

  if lhs_type == rhs_type

    case lhs_type
    when :io

      return self.compare_text_streams_ lhs, rhs, options
    when :path

      return self.compare_text_files_ lhs, rhs, options
    end
  else

    case lhs_type
    when :io

      if :path == rhs_type

        File.open(rhs, 'r') do |rhs_f|

          return self.compare_text_streams_ lhs, rhs_f, options
        end
      end
    when :path

      if :path == lhs_type

        File.open(lhs, 'r') do |lhs_f|

          return self.compare_text_streams_ lhs_f, rhs, options
        end
      end
    end
  end

  warn "#{__method__}: incompatible types (#{lhs.type}, #{rhs.type})"

  nil
end

.compare_text_files_(lhs_path, rhs_path, options) ⇒ Object 



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# File 'lib/cmpfs/compare/text/internal_.rb', line 60

def self.compare_text_files_ lhs_path, rhs_path, options

  File.open(lhs_path, 'r') do |lhs_stm|

    File.open(rhs_path, 'r') do |rhs_stm|

      self.compare_text_streams_ lhs_stm, rhs_stm, options.merge(no_rewind: true)
    end
  end
end

.compare_text_streams_(lhs_stm, rhs_stm, options) ⇒ Object 



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# File 'lib/cmpfs/compare/text/internal_.rb', line 71

def self.compare_text_streams_ lhs_stm, rhs_stm, options

  lhs_en  = lhs_stm.each_line
  rhs_en  = rhs_stm.each_line

  unless options[:no_rewind]

    lhs_en.rewind if lhs_stm.respond_to?(:rewind)
    rhs_en.rewind if rhs_stm.respond_to?(:rewind)
  end

  lhs_ix  = 0
  rhs_ix  = 0

  loop do

    lhs_ln, lhs_nr  = self.next_line_or_nil_ lhs_en, options
    rhs_ln, rhs_nr  = self.next_line_or_nil_ rhs_en, options

    if lhs_ln != rhs_ln

      return false
    else

      return true if lhs_ln.nil?
    end
  end

  return true
end

.determine_param_type_(p) ⇒ Object 



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# File 'lib/cmpfs/compare/text/internal_.rb', line 12

def self.determine_param_type_ p

  case p
  when ::IO, ::StringIO

    return :io
  when ::String

    return :path
  else

    return :path if p.respond_to?(:to_str)

    return nil
  end
end

.next_line_or_nil_(en, options) ⇒ Object 



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# File 'lib/cmpfs/compare/text/internal_.rb', line 29

def self.next_line_or_nil_ en, options

  skipping_blanks = options[:skip_blank_lines]
  trimming_lines  = options[:trim_lines]

  num_read = 0

  begin

    loop do

      line = en.next

      num_read += 1

      line = line.strip if trimming_lines

      if line.empty? && skipping_blanks

        next
      end

      return [ line, num_read ]
    end
  rescue StopIteration

  end

  return [ nil, num_read ]
end