Class: RDF::Literal::Double
- Inherits:
-
Numeric
- Object
- RDF::Literal
- Numeric
- RDF::Literal::Double
- Defined in:
- lib/rdf/model/literal/double.rb
Overview
An floating point number literal.
Constant Summary collapse
- DATATYPE =
RDF::URI("http://www.w3.org/2001/XMLSchema#double")
- GRAMMAR =
/^(?:NaN|\-?INF|[+\-]?(?:\d+(:?\.\d*)?|\.\d+)(?:[eE][\+\-]?\d+)?)$/.freeze
- PI =
Approximation of the mathematical constant π
From the XQuery function math:pi.
Double.new(Math::PI)
Constants inherited from RDF::Literal
FALSE, TRUE, XSD_STRING, ZERO
Instance Attribute Summary
Attributes inherited from RDF::Literal
#datatype, #direction, #language
Instance Method Summary collapse
-
#<=>(other) ⇒ Integer
Compares this literal to
other
for sorting purposes. -
#==(other) ⇒ Boolean
Returns
true
if this literal is equal toother
. -
#abs ⇒ RDF::Literal
Returns the absolute value of
self
. -
#canonicalize! ⇒ RDF::Literal
Converts this literal into its canonical lexical representation.
-
#ceil ⇒ RDF::Literal::Integer
Returns the smallest integer greater than or equal to
self
. -
#finite? ⇒ Boolean
Returns
true
if the value is a valid IEEE floating point number (it is not infinite, andnan?
isfalse
). -
#floor ⇒ RDF::Literal::Integer
Returns the largest integer less than or equal to
self
. -
#infinite? ⇒ Integer
Returns
nil
,-1
, or+1
depending on whether the value is finite,-INF
, or+INF
. -
#initialize(value, datatype: nil, lexical: nil, **options) ⇒ Double
constructor
A new instance of Double.
-
#nan? ⇒ Boolean
Returns
true
if the value is an invalid IEEE floating point number. -
#nonzero? ⇒ Boolean
Returns
self
if the value is not zero,nil
otherwise. -
#round ⇒ RDF::Literal::Double
Returns the number with no fractional part that is closest to the argument.
-
#to_s ⇒ String
Returns the value as a string.
-
#zero? ⇒ Boolean
Returns
true
if the value is zero.
Methods inherited from Numeric
#%, #*, #**, #+, #+@, #-, #-@, #/, #acos, #asin, #atan, #atan2, #cos, #exp, #exp10, #log, #log10, #sin, #sqrt, #tan, #to_d, #to_f, #to_i, #to_r
Methods inherited from RDF::Literal
#compatible?, #comperable_datatype2?, #comperable_datatype?, #datatype?, #direction?, #english?, #eql?, #escape, #hash, #humanize, #inspect, #language?, #literal?, #method_missing, #object, #plain?, #respond_to_missing?, #simple?, #squish, #squish!, #valid?, #validate!, #value, #value_hash
Methods included from Term
#compatible?, #eql?, #escape, #term?, #terms, #to_base, #to_term
Methods included from Value
#anonymous?, #canonicalize, #constant?, #graph?, #inspect, #inspect!, #invalid?, #iri?, #list?, #literal?, #node?, #resource?, #start_with?, #statement?, #term?, #to_nquads, #to_ntriples, #to_rdf, #to_term, #type_error, #uri?, #valid?, #validate!, #variable?
Constructor Details
#initialize(value, datatype: nil, lexical: nil, **options) ⇒ Double
Returns a new instance of Double.
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# File 'lib/rdf/model/literal/double.rb', line 20 def initialize(value, datatype: nil, lexical: nil, **) @datatype = RDF::URI(datatype || self.class.const_get(:DATATYPE)) @string = lexical || (value if value.is_a?(String)) @object = case when value.is_a?(::String) then case value.upcase when '+INF' then 1/0.0 when 'INF' then 1/0.0 when '-INF' then -1/0.0 when 'NAN' then 0/0.0 else Float(value.sub(/\.[eE]/, '.0E')) rescue nil end when value.is_a?(::Float) then value when value.respond_to?(:to_f) then value.to_f else 0.0 # FIXME end end |
Dynamic Method Handling
This class handles dynamic methods through the method_missing method in the class RDF::Literal
Instance Method Details
#<=>(other) ⇒ Integer
Compares this literal to other
for sorting purposes.
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# File 'lib/rdf/model/literal/double.rb', line 97 def <=>(other) case other when ::Numeric to_f <=> other when RDF::Literal::Decimal to_f <=> other.to_d when RDF::Literal::Double to_f <=> other.to_f else super end end |
#==(other) ⇒ Boolean
Returns true
if this literal is equal to other
.
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# File 'lib/rdf/model/literal/double.rb', line 82 def ==(other) if valid? && infinite? && other.respond_to?(:infinite?) && other.infinite? infinite? == other.infinite? # JRuby INF comparisons differ from MRI else super end end |
#abs ⇒ RDF::Literal
Returns the absolute value of self
.
From the XQuery function fn:abs.
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# File 'lib/rdf/model/literal/double.rb', line 197 def abs (f = to_f) && f > 0 ? self : self.class.new(f.abs) end |
#canonicalize! ⇒ RDF::Literal
Converts this literal into its canonical lexical representation.
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# File 'lib/rdf/model/literal/double.rb', line 50 def canonicalize! # Can't use simple %f transformation due to special requirements from # N3 tests in representation @string = case when @object.nil? then 'NaN' when @object.nan? then 'NaN' when @object.infinite? then @object.to_s[0...-'inity'.length].upcase when @object.zero? then '0.0E0' else i, f, e = ('%.15E' % @object.to_f).split(/[\.E]/) f.sub!(/0*$/, '') # remove any trailing zeroes f = '0' if f.empty? # ...but there must be a digit to the right of the decimal point e.sub!(/^(?:\+|(\-))?0+(\d+)$/, '\1\2') # remove the optional leading '+' sign and any extra leading zeroes "#{i}.#{f}E#{e}" end @object = case @string when 'NaN' then 0/0.0 when 'INF' then 1/0.0 when '-INF' then -1/0.0 else Float(@string) end self end |
#ceil ⇒ RDF::Literal::Integer
Returns the smallest integer greater than or equal to self
.
From the XQuery function fn:ceil.
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# File 'lib/rdf/model/literal/double.rb', line 167 def ceil RDF::Literal::Integer.new(to_f.ceil) end |
#finite? ⇒ Boolean
Returns true
if the value is a valid IEEE floating point number (it is not infinite, and nan?
is false
).
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# File 'lib/rdf/model/literal/double.rb', line 134 def finite? to_f.finite? end |
#floor ⇒ RDF::Literal::Integer
Returns the largest integer less than or equal to self
.
From the XQuery function fn:floor.
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# File 'lib/rdf/model/literal/double.rb', line 185 def floor RDF::Literal::Integer.new(to_f.floor) end |
#infinite? ⇒ Integer
Returns nil
, -1
, or +1
depending on whether the value is finite, -INF
, or +INF
.
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# File 'lib/rdf/model/literal/double.rb', line 149 def infinite? to_f.infinite? end |
#nan? ⇒ Boolean
Returns true
if the value is an invalid IEEE floating point number.
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# File 'lib/rdf/model/literal/double.rb', line 119 def nan? to_f.nan? end |
#nonzero? ⇒ Boolean
Returns self
if the value is not zero, nil
otherwise.
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# File 'lib/rdf/model/literal/double.rb', line 226 def nonzero? to_f.nonzero? ? self : nil end |
#round ⇒ RDF::Literal::Double
Returns the number with no fractional part that is closest to the argument. If there are two such numbers, then the one that is closest to positive infinity is returned. An error is raised if arg is not a numeric value.
From the XQuery function fn:round.
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# File 'lib/rdf/model/literal/double.rb', line 208 def round self.class.new(to_d.round(half: (to_d < 0 ? :down : :up))) end |
#to_s ⇒ String
Returns the value as a string.
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# File 'lib/rdf/model/literal/double.rb', line 234 def to_s @string || case when @object.nan? then 'NaN' when @object.infinite? then @object.to_s[0...-'inity'.length].upcase else @object.to_s end end |
#zero? ⇒ Boolean
Returns true
if the value is zero.
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# File 'lib/rdf/model/literal/double.rb', line 217 def zero? to_f.zero? end |