class MongoInspiredCompare

Public Class Methods

compare( val, criterion ) click to toggle source

Takes a value and a comparitor and returns true or false

Basic Comparisons ↑

> MongoInspiredCompare.compare( 5, 5 )

> true ↑

> MongoInspiredCompare.compare( 5, 6 )

> false ↑

Basic Operators ↑

> MongoInspiredCompare.compare( 5, {“$gte”=>5} )

> true ↑

> MongoInspiredCompare.compare( 5, {“$lt”=>5} )

> false ↑

> MongoInspiredCompare.compare( 5, {“$in”=>[1, 2, 3, 4, 5]} ) /Users/daviddo/Documents/mongo_inspired_compare/lib/mongo_inspired_compare.rb:13: warning: constant ::Fixnum is deprecated

> true ↑

> MongoInspiredCompare.compare( 5, {“$nin”=>[1, 2, 3, 4, 5]} )

> false ↑

Nesting ↑

> MongoInspiredCompare.compare( 5, {“$in”=>[{“$lt”=>5}, {“$gte”=>5}]} )

> true ↑

And/or Operators ↑

> MongoInspiredCompare.compare( 5, {“$or”=>[{“$lt”=>5}, {“$gte”=>5}]} )

> true ↑

> MongoInspiredCompare.compare( 5, {“$and”=>[{“$lt”=>5}, {“$gte”=>5}]} )

> false ↑

Invariance ↑

> MongoInspiredCompare.compare( “5”, {“$gte”=>5} )

> true ↑

> MongoInspiredCompare.compare( “5x”, {“$gte”=>5} )

> false ↑

# File lib/mongo_inspired_compare.rb, line 49
def self.compare( val, criterion )
  
  if criterion.class != Hash
    val == criterion
  else
    # v might look like { "$gte" => 12, "$lt" => 1 }
    criterion.all? do |oper,v2|
      if (v2.class == Float or v2.class == Integer or v2.class == Fixnum) and val.class == String
        num_val = numerical(val)
      else
        num_val = val
      end
    
      if oper == "$in" # "$in" => [">4000", {"$gt" => -100 }]
        v2.any? {|v3| compare( val, v3)}
      elsif oper == "$nin" # "$in" => [">4000", {"$gt" => -100 }]
        !v2.any? {|v3| compare( val, v3)}
      elsif num_val == nil
        false
      elsif oper == "$gte"
        num_val >= v2
      elsif oper == "$gt"
        num_val > v2
      elsif oper == "$lte"
        num_val <= v2
      elsif oper == "$lt"
        num_val < v2
      else
        raise "Error: unknown operator #{ oper }"
      end
    end
  end
end
compare_object( obj, filter ) click to toggle source 
# File lib/mongo_inspired_compare.rb, line 84
def self.compare_object( obj, filter )
  filter.all? do |k,v|
    if k == "$and"
      v.all? {|e| compare_object(obj, e)}
    elsif k == "$or"
      v.any? {|e| compare_object(obj, e)}
    else
      compare( obj[k], v)
    end
  end
end

Private Class Methods

numerical( str ) click to toggle source 
# File lib/mongo_inspired_compare.rb, line 97
def self.numerical( str )
  (str and str.strip =~ /^[\-\d\.]+$/) ? str.to_f : nil
end