class TaskJuggler::LogicalFunction

The LogicalFunction is a specialization of the LogicalOperation. It models a function call in a LogicalExpression.

Attributes

arguments[RW]

name[RW]

Public Class Methods

new(opnd) click to toggle source

Create a new LogicalFunction. opnd is the name of the function.

# File lib/taskjuggler/LogicalFunction.rb, line 44
def initialize(opnd)
  if opnd[-1] == ?_
    # Function names with a trailing _ are like their counterparts without
    # the _. But during evaluation the property and the scope properties
    # will be switched.
    @name = opnd[0..-2]
    @invertProperties = true
  else
    @name = opnd
    @invertProperties = false
  end
  @arguments = []
end

Public Instance Methods

eval(expr) click to toggle source

Evaluate the function by calling it with the arguments.

# File lib/taskjuggler/LogicalFunction.rb, line 76
def eval(expr)
  # Call the function and return the result.
  send(name, expr, @arguments)
end

setArgumentsAndCheck(args) click to toggle source

Register the arguments of the function and check if the name is a known function and the number of arguments match this function. If not, return an [ id, message ] error. Otherwise nil.

# File lib/taskjuggler/LogicalFunction.rb, line 61
def setArgumentsAndCheck(args)
  unless @@functions.include?(@name)
    return [ 'unknown_function',
             "Unknown function #{@name} used in logical expression." ]
  end
  if @@functions[@name] != args.length
    return [ 'wrong_no_func_arguments',
             "Wrong number of arguments for function #{@name}. Got " +
             "#{args.length} instead of #{@@functions[@name]}." ]
  end
  @arguments = args
  nil
end

to_s() click to toggle source

Return a textual expression of the function call.

# File lib/taskjuggler/LogicalFunction.rb, line 82
def to_s
  "#{@name}(#{@arguments.join(', ')})"
end