All files / src/datatypes logic.coffee

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module.exports.ThreeValuedLogic = class ThreeValuedLogic
  @and: (val...) ->
    if false in val then false
    else if null in val then null
    else true
 
  @or: (val...) ->
    if true in val then true
    else if null in val then null
    else false
 
  @xor: (val...) ->
    if null in val then null
    else val.reduce (a,b) -> (!a ^ !b) is 1
 
  @not: (val) ->
    if val? then return not val else return null