Class: Cronex::Parser

Inherits:
Object
  • Object
show all
Defined in:
lib/cronex/parser.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(expression, options = {}) ⇒ Parser

Returns a new instance of Parser.



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# File 'lib/cronex/parser.rb', line 15

def initialize(expression, options = {})
  @expression = expression
  @options = options
end

Instance Attribute Details

#expression ⇒ Object

Returns the value of attribute expression.



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# File 'lib/cronex/parser.rb', line 13

def expression
  @expression
end

#options ⇒ Object

Returns the value of attribute options.



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# File 'lib/cronex/parser.rb', line 13

def options
  @options
end

Instance Method Details

#normalize(expression_parts, options = {}) ⇒ Object 



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# File 'lib/cronex/parser.rb', line 60

def normalize(expression_parts, options = {})
  parts = expression_parts.dup

  # convert ? to * only for DOM and DOW
  parts[3].gsub!('?', '*')
  parts[5].gsub!('?', '*')

  # Convert 0/, 1/ to */
  parts[0].gsub!('0/', '*/') if parts[0].start_with?('0/') # seconds
  parts[1].gsub!('0/', '*/') if parts[1].start_with?('0/') # minutes
  parts[2].gsub!('0/', '*/') if parts[2].start_with?('0/') # hours
  parts[3].gsub!('1/', '*/') if parts[3].start_with?('1/') # day of month
  parts[4].gsub!('1/', '*/') if parts[4].start_with?('1/') # month
  parts[5].gsub!('1/', '*/') if parts[5].start_with?('1/') # day of week

  # convert */1 to *
  parts = parts.map { |part| part == '*/1' ? '*' : part }

  # convert SUN-SAT format to 0-6 format
  DAY_NUM.each { |day, i| i += 1 if !options[:zero_based_dow]; parts[5].gsub!(day, i.to_s) }

  # convert JAN-DEC format to 1-12 format
  MONTH_NUM.each { |month, i| parts[4].gsub!(month, i.to_s) }

  # convert 0 second to (empty)
  parts[0] = '' if parts[0] == '0'

  # convert 0 DOW to 7 so that 0 for Sunday in zeroBasedDayOfWeek is valid
  parts[5] = '7' if (!options || options[:zero_based_dow]) && parts[5] == '0' # ; p parts
  parts
end

#parse(exp = expression) ⇒ Object 



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# File 'lib/cronex/parser.rb', line 20

def parse(exp = expression)
  parsed_parts = Array.new(7, '')

  fail ExpressionError, 'Error: Expression null or empty' unless Cronex::Utils.present?(exp)
  parts = sanitize(exp).split(' ')
  len = parts.size

  if len < 5
    fail ExpressionError, "Error: Expression only has #{len} parts. At least 5 parts are required"
  elsif len == 5
    # 5 part CRON so shift array past seconds element
    parsed_parts.insert(1, *parts)
  elsif len == 6
    # if last element ends with 4 digits, a year element has been supplied and no seconds element
    if parts.last.match(/\d{4}$/)
      parsed_parts.insert(1, *parts)
    else
      parsed_parts.insert(0, *parts)
    end
  elsif len == 7
    parsed_parts = parts
  else
    fail ExpressionError, "Error: Expression has too many parts (#{len}). Expression must not have more than 7 parts"
  end

  parsed_parts = parsed_parts.take(7) # ; p parsed_parts
  normalize(parsed_parts, options)
end

#sanitize(exp = expression) ⇒ Object 



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# File 'lib/cronex/parser.rb', line 49

def sanitize(exp = expression)
  # remove extra spaces
  exp = exp.strip.gsub(/\s+/, ' ').upcase
  # convert non-standard day names (e.g. THURS, TUES) to 3-letter names
  DAY_DAY.each do |day, longname|
    matched = exp.scan(/\W*(#{day}\w*)/).flatten.uniq
    matched.each { |m| exp.gsub!(m, day) if longname.include?(m) }
  end
  exp
end