Module: Puppet::Pops::Utils

Included in:
Evaluator::CompareOperator, Evaluator::EvaluatorImpl
Defined in:
lib/puppet/pops/utils.rb

Class Method Summary collapse

Class Method Details

.is_absolute?(name) ⇒ Boolean

is the name absolute (i.e. starts with ::)


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# File 'lib/puppet/pops/utils.rb', line 107

def self.is_absolute? name
  name.start_with? "::".freeze
end

.is_numeric?(o) ⇒ Boolean

Can the given o be converted to numeric? (or is numeric already) Accepts a leading '::' Returns a boolean if the value is numeric If testing if value can be converted it is more efficient to call #to_n or #to_n_with_radix directly and check if value is nil.


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# File 'lib/puppet/pops/utils.rb', line 9

def self.is_numeric?(o)
  case o
  when Numeric
    true
  else
    !!Patterns::NUMERIC.match(relativize_name(o.to_s))
  end
end

.match_to_fp(match) ⇒ Object

Convert a match from Patterns::NUMERIC to floating point value if possible


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# File 'lib/puppet/pops/utils.rb', line 20

def self.match_to_fp(match)
  if match[5].to_s.length > 0
    # Use default radix (default is decimal == 10) for floats
    # Do not convert a value that is 0 raised to 10^somevalue to float - the value is always 0
    # i.e. 0000.0e1, 0e1, 0.0000e1
    if Integer(match[4]) == 0 && match[5] =~ /\A\.?0*[eE].*\z/
      nil
    else
      fp_value = Float(match[2])
      if fp_value != Float::INFINITY
        match[1] == '-' ? -fp_value : fp_value
      else
        nil
      end
    end
  end
end

.name_to_segments(name) ⇒ Object


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# File 'lib/puppet/pops/utils.rb', line 111

def self.name_to_segments name
  name.split("::".freeze)
end

.relativize_name(name) ⇒ Object


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# File 'lib/puppet/pops/utils.rb', line 115

def self.relativize_name name
  is_absolute?(name) ? name[2..-1] : name
end

.to_n(o) ⇒ Object

To Numeric (or already numeric) Returns nil if value is not numeric, else an Integer or Float. A String may have an optional sign.

A leading '::' is accepted (and ignored)


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# File 'lib/puppet/pops/utils.rb', line 84

def self.to_n o
  begin
    case o
    when String
      match = Patterns::NUMERIC.match(relativize_name(o))
      if !match
        nil
      elsif match[5].to_s.length > 0
        match_to_fp(match)
      else
        match[1] == '-' ? -Integer(match[2]) : Integer(match[2])
      end
    when Numeric
      o
    else
      nil
    end
  rescue ArgumentError
    nil
  end
end

.to_n_with_radix(o) ⇒ Array<Number, Integer>?

To Numeric with radix, or nil if not a number. If the value is already Numeric it is returned verbatim with a radix of 10.


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# File 'lib/puppet/pops/utils.rb', line 45

def self.to_n_with_radix o
  begin
    case o
    when String
      match = Patterns::NUMERIC.match(relativize_name(o))
      if !match
        nil
      elsif match[5].to_s.length > 0
        fp_value = match_to_fp(match)
        fp_value.nil? ? nil : [fp_value, 10]
      else
        # Set radix (default is decimal == 10)
        radix = 10
        if match[3].to_s.length > 0
          radix = 16
        elsif match[4].to_s.length > 1 && match[4][0,1] == '0'
          radix = 8
        end
        # Ruby 1.8.7 does not have a second argument to Kernel method that creates an
        # integer from a string, it relies on the prefix 0x, 0X, 0 (and unsupported in puppet binary 'b')
        # We have the correct string here, match[2] is safe to parse without passing on radix
        match[1] == '-' ? [-Integer(match[2]), radix] : [Integer(match[2]), radix]
      end
    when Numeric
      # Impossible to calculate radix, assume decimal
      [o, 10]
    else
      nil
    end
  rescue ArgumentError
    nil
  end
end