Class: Envo::ListVal

Inherits:
Object
  • Object
show all
Defined in:
lib/envo/val/list_val.rb

Direct Known Subclasses

PathListVal

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(ar) ⇒ ListVal

Returns a new instance of ListVal.



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# File 'lib/envo/val/list_val.rb', line 3

def initialize(ar)
  @ar = ar
end

Instance Attribute Details

#ar ⇒ Object (readonly)

Returns the value of attribute ar.



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# File 'lib/envo/val/list_val.rb', line 6

def ar
  @ar
end

Instance Method Details

#accept_assign?(other) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/envo/val/list_val.rb', line 88

def accept_assign?(other)
  other.list?
end

#accept_item?(item) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/envo/val/list_val.rb', line 100

def accept_item?(item)
  true
end

#clean! ⇒ Object 



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# File 'lib/envo/val/list_val.rb', line 34

def clean!
  uniq!
end

#delete(elem) ⇒ Object 



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# File 'lib/envo/val/list_val.rb', line 25

def delete(elem)
  @ar.delete(elem)
end

#delete_at(index) ⇒ Object 



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# File 'lib/envo/val/list_val.rb', line 28

def delete_at(index)
  @ar.delete_at(index)
end

#insert(elem, pos = nil) ⇒ Object 



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# File 'lib/envo/val/list_val.rb', line 8

def insert(elem, pos = nil)
  # assume unique elements
  old_index = @ar.index(elem)
  new_index = case pos
    when :front then 0
    when :back then -1
    else old_index
  end

  return @ar << elem if !new_index
  return @ar if new_index == old_index
  return @ar.insert(new_index, elem) if !old_index

  # we need to reorder
  @ar.delete_at(old_index)
  @ar.insert(new_index, elem)
end

#invalid_description ⇒ Object 



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# File 'lib/envo/val/list_val.rb', line 91

def invalid_description
  @ar.empty? ? "empty list" : nil
end

#list? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/envo/val/list_val.rb', line 94

def list?
  true
end

#pp_attribs(elem) ⇒ Object 



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# File 'lib/envo/val/list_val.rb', line 70

def pp_attribs(elem)
  @ar.count(elem) > 1 ? 'D' : ' '
end

#pretty_print(ctx) ⇒ Object 



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# File 'lib/envo/val/list_val.rb', line 73

def pretty_print(ctx)
  ctx.puts "["
  @ar.each_with_index do |v, i|
    str = pp_attribs(v) + ' '
    str += "#{i}:".ljust(4)
    str += v
    ctx.puts str
  end
  ctx.puts ']'
end

#shift(elem, dir) ⇒ Object 



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# File 'lib/envo/val/list_val.rb', line 37

def shift(elem, dir)
  i = @ar.index(elem)
  return nil if i == nil
  shift_at(i, dir)
end

#shift_at(i, dir) ⇒ Object 



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# File 'lib/envo/val/list_val.rb', line 42

def shift_at(i, dir)
  return nil if i>@ar.size

  if dir == :front
    return i if i == 0
    elem = ar[i]
    @ar.delete_at i
    @ar.unshift(elem)
    0
  elsif dir == :back
    return i if i == (@ar.size-1)
    elem = ar[i]
    @ar.delete_at i
    @ar << elem
    @ar.size-1
  elsif dir == :up
    return i if i == 0
    @ar[i-1], @ar[i] = @ar[i], @ar[i-1]
    i - 1
  elsif dir == :down
    return i if i == (@ar.size-1)
    @ar[i+1], @ar[i] = @ar[i], @ar[i+1]
    i + 1
  else
    -1
  end
end

#to_list ⇒ Object 



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# File 'lib/envo/val/list_val.rb', line 97

def to_list
  return self
end

#to_s ⇒ Object 



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# File 'lib/envo/val/list_val.rb', line 103

def to_s
  raise StandardError.new "list can't be converted to String"
end

#type ⇒ Object

casts



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# File 'lib/envo/val/list_val.rb', line 85

def type
  :list
end

#uniq! ⇒ Object 



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# File 'lib/envo/val/list_val.rb', line 31

def uniq!
  @ar.uniq!
end