Class: TSV::Traverser

Inherits:
Object
  • Object
show all
Defined in:
lib/rbbt/tsv/manipulate.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(key_field, fields, new_key_field, new_fields, type, uniq) ⇒ Traverser

Returns a new instance of Traverser.



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# File 'lib/rbbt/tsv/manipulate.rb', line 60

def initialize(key_field, fields, new_key_field, new_fields, type, uniq)
  @new_key_field = TSV.identify_field(key_field, fields, new_key_field)

  raise "Key field #{ new_key_field } not found" if @new_key_field.nil?
  @new_fields = case new_fields
                when nil
                  case 
                  when @new_key_field == :key
                    :all
                  when fields.nil?
                    - @new_key_field
                  else 
                    new = (0..fields.length - 1).to_a
                    new.delete_at(@new_key_field)
                    new.unshift :key
                    new
                  end
                when Array
                  new_fields.collect do |field|
                    TSV.identify_field(key_field, fields, field)
                  end
                when String, Symbol
                  [TSV.identify_field(key_field, fields, new_fields)]
                else
                  raise "Unknown format for new_fields (should be nil, Array or String): #{new_fields.inspect}"
                end

  @new_key_field_name = case 
                        when @new_key_field == :key
                          key_field
                        else
                          fields[@new_key_field] if Array === fields
                        end

  if Array === fields
    @new_field_names = case
                       when fields.nil?
                         nil
                       when Array === @new_fields
                         @new_field_names = @new_fields.collect do |field|
                           case 
                           when field == :key
                             key_field
                           else
                             fields[field]
                           end
                         end
                       when @new_fields == :all
                         fields
                       when (Fixnum === @new_fields and @new_fields <= 0)
                         new = fields.dup
                         new.delete_at(- @new_fields)
                         new.unshift key_field
                         new
                       end
  end

  case
  when (@new_key_field == :key and (@new_fields == :all or fields.nil? or @new_fields == (0..fields.length - 1).to_a))
    self.instance_eval do alias process process_null end
  when @new_key_field == :key 
    if type == :double
      if Fixnum === @new_fields and @new_fields <= 0
        self.instance_eval do alias process process_subset_all_but_double end
      else
        self.instance_eval do alias process process_subset_double end
      end
    else
      if Fixnum === @new_fields and @new_fields <= 0
        self.instance_eval do alias process process_subset_all_but_list end
      else
        self.instance_eval do alias process process_subset_list end
      end
    end
  else
    case type 
    when :double
      if uniq
        self.instance_eval do alias process process_reorder_double_uniq end
      else
        self.instance_eval do alias process process_reorder_double end
      end
    when :flat
      self.instance_eval do alias process process_reorder_flat end
    else
      self.instance_eval do alias process process_reorder_list end
    end
  end
end

Instance Attribute Details

#new_field_names ⇒ Object

Returns the value of attribute new_field_names.



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# File 'lib/rbbt/tsv/manipulate.rb', line 8

def new_field_names
  @new_field_names
end

#new_fields ⇒ Object

Returns the value of attribute new_fields.



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# File 'lib/rbbt/tsv/manipulate.rb', line 8

def new_fields
  @new_fields
end

#new_key_field ⇒ Object

Returns the value of attribute new_key_field.



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# File 'lib/rbbt/tsv/manipulate.rb', line 8

def new_key_field
  @new_key_field
end

#new_key_field_name ⇒ Object

Returns the value of attribute new_key_field_name.



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# File 'lib/rbbt/tsv/manipulate.rb', line 8

def new_key_field_name
  @new_key_field_name
end

#type ⇒ Object

Returns the value of attribute type.



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# File 'lib/rbbt/tsv/manipulate.rb', line 8

def type
  @type
end

#uniq ⇒ Object

Returns the value of attribute uniq.



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# File 'lib/rbbt/tsv/manipulate.rb', line 8

def uniq
  @uniq
end

Instance Method Details

#process_null(key, values) ⇒ Object 



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# File 'lib/rbbt/tsv/manipulate.rb', line 10

def process_null(key, values)
  [[key], values]
end

#process_reorder_double(key, values) ⇒ Object 



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# File 'lib/rbbt/tsv/manipulate.rb', line 46

def process_reorder_double(key, values)
  [ values[@new_key_field], 
    @new_fields.collect{|field| field == :key ?  
      [key] : values[field] }
  ]
end

#process_reorder_double_uniq(key, values) ⇒ Object 



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# File 'lib/rbbt/tsv/manipulate.rb', line 29

def process_reorder_double_uniq(key, values)
  [ values[@new_key_field].uniq, 
    @new_fields.collect{|field| field == :key ?  
      [key] : values[field] }
  ]
end

#process_reorder_flat(key, values) ⇒ Object 



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# File 'lib/rbbt/tsv/manipulate.rb', line 53

def process_reorder_flat(key, values)
  [ values,
    @new_fields.collect{|field| field == :key ?  
      [key] : values[field] }.flatten
  ]
end

#process_reorder_list(key, values) ⇒ Object 



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# File 'lib/rbbt/tsv/manipulate.rb', line 24

def process_reorder_list(key, values)
  [ [values[@new_key_field]], 
    @new_fields.collect{|field| field == :key ?  key : values[field] }]
end

#process_subset_all_but_double(key, values) ⇒ Object 



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# File 'lib/rbbt/tsv/manipulate.rb', line 40

def process_subset_all_but_double(key, values)
  new = values.dup
  new.delete_at(0 - @new_fields)
  [[key], new]
end

#process_subset_all_but_list(key, values) ⇒ Object 



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# File 'lib/rbbt/tsv/manipulate.rb', line 18

def process_subset_all_but_list(key, values)
  new = values.dup
  new.delete_at(0 - @new_fields)
  [key, new]
end

#process_subset_double(key, values) ⇒ Object 



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# File 'lib/rbbt/tsv/manipulate.rb', line 36

def process_subset_double(key, values)
  [[key], @new_fields.collect{|field| field == :key ?  [key] : values[field] }]
end

#process_subset_list(key, values) ⇒ Object 



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# File 'lib/rbbt/tsv/manipulate.rb', line 14

def process_subset_list(key, values)
  [key, @new_fields.collect{|field| field == :key ?  key : values[field] }]
end