Class: Namo

Inherits:
Object
  • Object
show all
Includes:
Enumerable
Defined in:
lib/Namo/Row.rb,
lib/namo.rb,
lib/Namo/VERSION.rb,
lib/Namo/Formulae.rb,
lib/Namo/Collection.rb,
lib/Namo/Enumerable.rb,
lib/Namo/NegatedDimension.rb

Overview

Namo/NegatedDimension.rb Namo::NegatedDimension

Direct Known Subclasses

Collection

Defined Under Namespace

Modules: Enumerable Classes: Collection, Formulae, NegatedDimension, Row

Constant Summary collapse

VERSION = 
'0.21.0'

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from Enumerable

#drop, #drop_while, #each, #first, #group_by, #last, #partition, #reject, #select, #sort_by, #take, #take_while, #uniq

Instance Attribute Details

#data ⇒ Object

Returns the value of attribute data.



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# File 'lib/namo.rb', line 15

def data
  @data
end

#formulae ⇒ Object

Returns the value of attribute formulae.



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# File 'lib/namo.rb', line 16

def formulae
  @formulae
end

#name ⇒ Object

Returns the value of attribute name.



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# File 'lib/namo.rb', line 17

def name
  @name
end

Instance Method Details

#&(other) ⇒ Object 



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# File 'lib/namo.rb', line 103

def &(other)
  raise_unless_namo(other)
  raise_unless_matching_data_dimensions(other)
  self.class.new(@data & other.data, formulae: @formulae.dup)
end

#*(other, &block) ⇒ Object 



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# File 'lib/namo.rb', line 121

def *(other, &block)
  raise_unless_namo(other)
  raise_unless_shared_data_dimensions(other)
  raise_unless_data_formula_exclusivity(other)
  shared = data_dimensions & other.data_dimensions
  combined_data = []
  @data.each do |left_row|
    matched = other.data.select{|right_row| shared.all?{|dim| left_row[dim] == right_row[dim]}}
    if block
      candidates = other.class.new(matched, formulae: other.formulae.dup)
      chosen = block.call(Row.new(left_row, @formulae, self), candidates)
      chosen.data.each{|right_row| combined_data << left_row.merge(right_row)}
    else
      matched.each{|right_row| combined_data << left_row.merge(right_row)}
    end
  end
  self.class.new(combined_data, formulae: other.formulae.merge(@formulae))
end

#**(other, &block) ⇒ Object 



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# File 'lib/namo.rb', line 140

def **(other, &block)
  raise_unless_namo(other)
  raise_unless_disjoint_data_dimensions(other)
  raise_unless_data_formula_exclusivity(other)
  combined_data = []
  @data.each do |left_row|
    if block
      candidates = other.class.new(other.data, formulae: other.formulae.dup)
      chosen = block.call(Row.new(left_row, @formulae, self), candidates)
      chosen.data.each{|right_row| combined_data << left_row.merge(right_row)}
    else
      other.data.each{|right_row| combined_data << left_row.merge(right_row)}
    end
  end
  self.class.new(combined_data, formulae: other.formulae.merge(@formulae))
end

#+(other) ⇒ Object 



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# File 'lib/namo.rb', line 91

def +(other)
  raise_unless_namo(other)
  raise_unless_matching_data_dimensions(other)
  self.class.new(@data + other.data, formulae: other.formulae.merge(@formulae))
end

#-(other) ⇒ Object 



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# File 'lib/namo.rb', line 97

def -(other)
  raise_unless_namo(other)
  raise_unless_matching_data_dimensions(other)
  self.class.new(@data - other.data, formulae: @formulae.dup)
end

#/(other) ⇒ Object 



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# File 'lib/namo.rb', line 157

def /(other)
  raise_unless_namo(other)
  kept = data_dimensions - other.data_dimensions
  projected = @data.map do |row|
    kept.each_with_object({}){|dim, hash| hash[dim] = row[dim]}
  end
  self.class.new(projected.uniq, formulae: @formulae.dup)
end

#<(other) ⇒ Object 



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# File 'lib/namo.rb', line 187

def <(other)
  raise_unless_namo(other)
  raise_unless_matching_data_dimensions(other)
  proper_subset_of_rows?(other)
end

#<=(other) ⇒ Object 



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# File 'lib/namo.rb', line 193

def <=(other)
  raise_unless_namo(other)
  raise_unless_matching_data_dimensions(other)
  subset_of_rows?(other)
end

#==(other) ⇒ Object 



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# File 'lib/namo.rb', line 166

def ==(other)
  return false unless other.is_a?(Namo)
  row_multiset == other.row_multiset
end

#===(other) ⇒ Object 



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# File 'lib/namo.rb', line 171

def ===(other)
  return false unless other.is_a?(Namo)
  dimensions.sort == other.dimensions.sort &&
    @formulae.keys.sort == other.formulae.keys.sort
end

#>(other) ⇒ Object 



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# File 'lib/namo.rb', line 199

def >(other)
  raise_unless_namo(other)
  raise_unless_matching_data_dimensions(other)
  other.proper_subset_of_rows?(self)
end

#>=(other) ⇒ Object 



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# File 'lib/namo.rb', line 205

def >=(other)
  raise_unless_namo(other)
  raise_unless_matching_data_dimensions(other)
  other.subset_of_rows?(self)
end

#[](*names, **selections) ⇒ Object 



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# File 'lib/namo.rb', line 55

def [](*names, **selections)
  rows = selections.any? ? select{|row| row.match?(selections)} : entries
  negated, positive = names.partition{|n| n.is_a?(NegatedDimension)}
  if negated.any? && positive.any?
    raise ArgumentError, "cannot mix projection and contraction in a single call"
  end
  projected = (
    if negated.any?
      excluded = negated.map(&:name)
      kept = data_dimensions - excluded
      rows.map do |row|
        kept.each_with_object({}){|name, hash| hash[name] = row[name]}
      end
    elsif positive.any?
      rows.map do |row|
        positive.each_with_object({}){|name, hash| hash[name] = row[name]}
      end
    else
      rows.map(&:to_h)
    end
  )
  carried = positive.any? ? @formulae.reject{|name, _| positive.include?(name)} : @formulae.dup
  self.class.new(projected, formulae: carried)
end

#[]=(name, value) ⇒ Object 



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# File 'lib/namo.rb', line 80

def []=(name, value)
  case value
  when Proc
    @data.each{|row| row.delete(name)} if @data.first&.key?(name)
    @formulae[name] = value
  else
    @formulae.delete(name)
    @data.each{|row| row[name] = value}
  end
end

#^(other) ⇒ Object 



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# File 'lib/namo.rb', line 115

def ^(other)
  raise_unless_namo(other)
  raise_unless_matching_data_dimensions(other)
  self.class.new((@data - other.data) + (other.data - @data), formulae: other.formulae.merge(@formulae))
end

#coordinates(*dims) ⇒ Object 



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

def coordinates(*dims)
  if dims.empty?
    values.transform_values(&:uniq)
  elsif dims.length == 1
    values(dims.first).uniq
  else
    dims.each_with_object({}){|dim, hash| hash[dim] = values(dim).uniq}
  end
end

#data_dimensions ⇒ Object 



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# File 'lib/namo.rb', line 23

def data_dimensions
  @data.first&.keys || []
end

#derived_dimensions ⇒ Object 



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# File 'lib/namo.rb', line 27

def derived_dimensions
  @formulae.keys
end

#dimensions ⇒ Object 



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

def dimensions
  data_dimensions + derived_dimensions
end

#eql?(other) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/namo.rb', line 177

def eql?(other)
  self.class == other.class &&
    row_multiset == other.row_multiset &&
    @formulae.keys.sort == other.formulae.keys.sort
end

#hash ⇒ Object 



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# File 'lib/namo.rb', line 183

def hash
  [self.class, row_multiset, @formulae.keys.sort].hash
end

#to_a ⇒ Object 



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# File 'lib/namo.rb', line 211

def to_a
  @data.map do |row|
    row.keys.each_with_object({}) do |key, hash|
      hash[key] = row[key]
    end
  end
end

#to_h ⇒ Object 



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# File 'lib/namo.rb', line 51

def to_h
  values
end

#values(*dims) ⇒ Object 



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# File 'lib/namo.rb', line 31

def values(*dims)
  if dims.empty?
    materialisable_dimensions.each_with_object({}){|dim, hash| hash[dim] = values_for(dim)}
  elsif dims.length == 1
    values_for(dims.first)
  else
    dims.each_with_object({}){|dim, hash| hash[dim] = values_for(dim)}
  end
end

#|(other) ⇒ Object 



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# File 'lib/namo.rb', line 109

def |(other)
  raise_unless_namo(other)
  raise_unless_matching_data_dimensions(other)
  self.class.new((@data | other.data), formulae: other.formulae.merge(@formulae))
end