Class: FuzzyMatch::Rule::Grouping

Inherits:
FuzzyMatch::Rule show all
Defined in:
lib/fuzzy_match/rule/grouping.rb

Overview

“Record linkage typically involves two main steps: grouping and scoring…” en.wikipedia.org/wiki/Record_linkage

Groupings effectively divide up the haystack into groups that match a pattern

A grouping (formerly known as a blocking) comes into effect when a str matches. Then the needle must also match the grouping’s regexp.

Instance Attribute Summary collapse

Attributes inherited from FuzzyMatch::Rule

#regexp

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from FuzzyMatch::Rule

#==, #initialize

Constructor Details

This class inherits a constructor from FuzzyMatch::Rule

Instance Attribute Details

#chain ⇒ Object

Returns the value of attribute chain.



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# File 'lib/fuzzy_match/rule/grouping.rb', line 31

def chain
  @chain
end

Class Method Details

.make(regexps) ⇒ Object 



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# File 'lib/fuzzy_match/rule/grouping.rb', line 13

def make(regexps)
  case regexps
  when ::Regexp
    new regexps
  when ::Array
    chain = regexps.flatten.map { |regexp| new regexp }
    if chain.length == 1
      chain[0] # not really a chain after all
    else
      chain.each { |grouping| grouping.chain = chain }
      chain
    end
  else
    raise ArgumentError, "[fuzzy_match] Groupings should be specified as single regexps or an array of regexps (got #{regexps.inspect})"
  end
end

Instance Method Details

#inspect ⇒ Object 



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# File 'lib/fuzzy_match/rule/grouping.rb', line 33

def inspect
  memo = []
  memo << "#{regexp.inspect}"
  if chain
    memo << "(#{chain.find_index(self)} of #{chain.length})"
  end
  memo.join ' '
end

#xjoin?(needle, straw) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/fuzzy_match/rule/grouping.rb', line 50

def xjoin?(needle, straw)
  if primary?
    join?(needle, straw) and subs.none? { |sub| sub.match?(straw) } # maybe xmatch here?
  else
    join?(needle, straw) and primary.match?(straw)
  end
end

#xmatch?(record) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/fuzzy_match/rule/grouping.rb', line 42

def xmatch?(record)
  if primary?
    match?(record) and subs.none? { |sub| sub.match?(record) }
  else
    match?(record) and primary.match?(record)
  end
end