Class: TimeCursor::Elements

Inherits:
Array
  • Object
show all
Defined in:
lib/time_cursor/elements.rb

Constant Summary collapse

DATE_ALIAS = 
{
  'sun'=>'0', 'mon'=>'1', 'tue'=>'2', 'wed'=>'3',  'thr'=>'4',  'fri'=>'5', 'sat'=>'6',
  'jan'=>'1', 'feb'=>'2', 'mar'=>'3', 'apr'=>'4',  'may'=>'5',  'jun'=>'6',
  'jul'=>'7', 'aug'=>'8', 'sep'=>'9', 'oct'=>'10', 'nov'=>'11', 'dec'=>'12',
}
RE_ALL = 
%r|\A\*(/1)?\Z|
RE_WILD = 
%r|\A\*(/(\d+))?\Z|
RE_LIST = 
%r|\A(\d+)(-(\d+)(/(\d+))?)?\Z|

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.build(target, range = nil) ⇒ Object 



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# File 'lib/time_cursor/elements.rb', line 15

def self.build( target, range = nil )
  case  target
  when  Array
    target  =  target.join(',')

  when  Symbol
    target  =  target.to_s

  end

  case  target
  when  NilClass
    Elements.new( [] )

  when  Range
    Elements.new( target.to_a )

  when  Numeric
    Elements.new( [target] )

  when  String
    factors  =  DATE_ALIAS.inject( target.downcase ) do |s, (k, v)| s.gsub( k, v ) end
    items  =  factors.split(',').map do |factor|
      if  m = RE_ALL.match( factor )
        []
      elsif  m = RE_WILD.match( factor )
        if  range.nil?
          raise  ArgumentError, "disallow wildcard without range : '#{target}'"
        end
        from  =  range.first
        to    =  range.last
        step  =  ( m[2] || 1 ).to_i
        expand( from, to, step, range )
      elsif  m = RE_LIST.match( factor )
        from  =  ( m[1] ).to_i
        to    =  ( m[3] || m[1] ).to_i
        step  =  ( m[5] || 1 ).to_i
        expand( from, to, step, range )
      else
        raise  ArgumentError, "format invalid : '#{target}'"
      end
    end
    Elements.new( items.flatten.sort.uniq )

  else
    raise  ArgumentError, "type invalid : '#{target}'"

  end
end

.expand(from, to, step, range) ⇒ Object 



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# File 'lib/time_cursor/elements.rb', line 65

def self.expand( from, to, step, range )
  result  =  []
  cur  =  from
  if  from <= to
    loop do
      result  <<  cur
      cur  +=  step
      break    if  cur > to
    end
  else
    loop do
      result  <<  cur
      cur  +=  step
      break    if  cur > range.last
    end
    cur  =  range.first
    loop do
      result  <<  cur
      cur  +=  step
      break    if  cur > to
    end
  end
  result
end

Instance Method Details

#correspond?(item) ⇒ Boolean 



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# File 'lib/time_cursor/elements.rb', line 104

def correspond?( item )
  self.empty?  ||  self.include?( item )
end

#left(item) ⇒ Object 



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# File 'lib/time_cursor/elements.rb', line 97

def left( item )
  (self.size-1).downto(0) do |i|
    return  self[i]    if  self[i] < item
  end
  nil
end

#right(item) ⇒ Object 



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# File 'lib/time_cursor/elements.rb', line 90

def right( item )
  0.upto(self.size-1) do |i|
    return  self[i]    if  item < self[i]
  end
  nil
end