Class: Runt::TExpr

Inherits:
Object
  • Object
show all
Defined in:
lib/runt/temporalexpression.rb

Overview

FKA: TemporalExpression

Base class for all TExpr classes that has proved itself usefull enough to avoid O’s Razor, but that may wind up as a module.

‘TExpr’ is short for ‘TemporalExpression’ and are inspired by the recurring event pattern[http://martinfowler.com/apsupp/recurring.pdf] described by Martin Fowler. Essentially, they provide a pattern language for specifying recurring events using set expressions.

See also [tutorial_te.rdoc]

Direct Known Subclasses

Collection, DIMonth, DIWeek, Diff, REDay, REWeek, REYear, RSpec, Spec, WIMonth

Instance Method Summary collapse

Instance Method Details

#&(expr) ⇒ Object 



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# File 'lib/runt/temporalexpression.rb', line 60

def & (expr)
  self.and(expr){|adjusted| adjusted }
end

#-(expr) ⇒ Object 



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# File 'lib/runt/temporalexpression.rb', line 64

def - (expr)
  self.minus(expr){|adjusted| adjusted }
end

#and(arg) ⇒ Object 



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# File 'lib/runt/temporalexpression.rb', line 42

def and (arg)

  if self.kind_of?(Intersect)
    self.add(arg)
  else
    yield Intersect.new.add(self).add(arg)
  end

end

#include?(date_expr) ⇒ Boolean

Returns true or false depending on whether this TExpr includes the supplied date expression.

Returns:

  • (Boolean) 


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# File 'lib/runt/temporalexpression.rb', line 29

def include?(date_expr); false end

#minus(arg) {|Diff.new(self,arg)| ... } ⇒ Object

Yields:

  • (Diff.new(self,arg)) 


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# File 'lib/runt/temporalexpression.rb', line 52

def minus (arg)
    yield Diff.new(self,arg)
end

#or(arg) ⇒ Object 



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# File 'lib/runt/temporalexpression.rb', line 32

def or (arg)

  if self.kind_of?(Union)
    self.add(arg)
  else
    yield Union.new.add(self).add(arg)
  end

end

#to_s ⇒ Object 



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# File 'lib/runt/temporalexpression.rb', line 30

def to_s; "TExpr" end

#|(expr) ⇒ Object 



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# File 'lib/runt/temporalexpression.rb', line 56

def | (expr)
  self.or(expr){|adjusted| adjusted }
end