Class: Bmg::Operator::Rxmatch

Inherits:
Object
  • Object
show all
Includes:
Unary
Defined in:
lib/bmg/operator/rxmatch.rb

Overview

Rxmatch operator.

Filters operand’s tuples to those whose attributes match a given string or regular expression.

Constant Summary collapse

DEFAULT_OPTIONS = 
{
  case_sensitive: false
}

Constants included from Algebra

Algebra::METHODS

Instance Attribute Summary

Attributes included from Unary

#operand, #type

Instance Method Summary collapse

Methods included from Unary

#_visit, #operands

Methods included from Bmg::Operator

#inspect, #to_s

Methods included from Relation

#debug, #delete, empty, #empty?, #insert, new, #one, #one_or_nil, #to_json, #update, #visit, #ys_by_x

Methods included from Algebra

#allbut, #autosummarize, #autowrap, #constants, #extend, #group, #image, #matching, #page, #project, #rename, #restrict, #rxmatch, #spied, #union, #unspied

Constructor Details

#initialize(type, operand, attrs, matcher, options) ⇒ Rxmatch

Returns a new instance of Rxmatch.



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# File 'lib/bmg/operator/rxmatch.rb', line 16

def initialize(type, operand, attrs, matcher, options)
  @type = type
  @operand = operand
  @attrs = attrs
  @matcher = matcher
  @options = DEFAULT_OPTIONS.merge(options)
end

Instance Method Details

#each ⇒ Object 



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# File 'lib/bmg/operator/rxmatch.rb', line 34

def each
  @operand.each do |tuple|
    against = attrs.map{|a| tuple[a] }.join(" ")
    matcher = self.matcher
    unless case_sensitive?
      against = against.downcase
      matcher = matcher.downcase if matcher.is_a?(String)
    end
    yield(tuple) if against.match(matcher)
  end
end

#to_ast ⇒ Object 



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# File 'lib/bmg/operator/rxmatch.rb', line 46

def to_ast
  [ :rxmatch, operand.to_ast, attrs.dup, matcher, options.dup ]
end