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Ruby Temporal Expressions

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README.md

RUNT -- Ruby Temporal Expressions

  • Runt is a Ruby implementation of select temporal patterns by Martin Fowler described in this paper.

  • Temporal expressions allow a developer to define patterns of date recurrence using set expressions.

INSTALL

  • gem install runt

QUICK START

require 'date'
require 'runt'

include Runt

a_monday = Date.new(2013,5,13)                  # Monday, May 13 - has "day-level" precision
a_wednesday = DateTime.new(2013,5,15,8,45)      # Wednesday, May 15 at 8:45am - has "minute-level" precision

monday_expr = DIWeek.new(Mon)                   # Matches any Monday
monday_expr.include?(a_monday)                  # => true 
monday_expr.include?(a_wednesday)               # => false 

wednesday_expr = DIWeek.new(Wed)                # Matches any Wednesday
wednesday_expr.include?(a_monday)               # => false 
wednesday_expr.include?(a_wednesday)            # => true 

#
# Use an "OR" between two expressions
#
mon_or_wed_expr = monday_expr | wednesday_expr  # Matches any Monday OR any Wednesday
mon_or_wed_expr.include?(a_monday)              # => true
mon_or_wed_expr.include?(a_wednesday)           # => true

daily_8_to_11_expr =REDay.new(8,00,11,00,false) # Matches from 8am to 11am on ANY date. 
                                                # The 'false' argument says not to auto-match 
                                                # expressions of lesser precision.

at_9 = DateTime.new(2013,5,12,9,0)              # Sunday, May 12 at 9:00am
daily_8_to_11_expr.include?(at_9)               # => true 
#
# On the next line, the given Date instance is "promoted" to the minute-level precision 
# required by the temporal expression so the time component defaults to 00:00
#
daily_8_to_11_expr.include?(a_monday)           # => false 

#
# Use an "AND" between two expressions to match
#
#   (Monday OR Wednesday) AND (8am to 11am)
#
mon_or_wed_8_to_11_expr = mon_or_wed_expr & daily_8_to_11_expr

mon_or_wed_8_to_11_expr.include?(a_monday)      # => false - 00:00 is not between 8:00 and 11:00
mon_or_wed_8_to_11_expr.include?(at_9)          # => false - on Sunday
mon_or_wed_8_to_11_expr.include?(a_wednesday)   # => true - a Wednesday at 8:45

Tutorials

Etc...

Author: Matthew Lipper mlipper@gmail.com

Requires: Tested with J/Ruby 1.8.7, 1.9.3 and Ruby 2.0.x

License: Released under the MIT License (see LICENSE.txt).

Warranty

This software is provided "as is" and without any express or implied warranties, including, without limitation, the implied warranties of merchantibility and fitness for a particular purpose.

Copyright © 2002-2013 DCL Logo

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