Class: Array

Inherits:
Object show all
Defined in:
lib/strokedb/core_ext/blank.rb,
lib/strokedb/sync/diff/array.rb,
lib/strokedb/util/serialization.rb

Overview

:nodoc:

Constant Summary collapse

SDATPTAGS = 
{
  '-' => PATCH_MINUS,
  '+' => PATCH_PLUS,
  '!' => PATCH_DIFF
}.freeze

Instance Method Summary collapse

Instance Method Details

#stroke_diff(to) ⇒ Object 



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# File 'lib/strokedb/sync/diff/array.rb', line 8

def stroke_diff(to)
  return super(to) unless to.is_a?(Array)
  return nil if self == to
  
  # sdiff:  +   -   !   = 
  lcs_sdiff = ::Diff::LCS.sdiff(self, to)
  patchset = lcs_sdiff.inject([]) do |patchset, change|
    a = SDATPTAGS[change.action]
    if a == PATCH_DIFF
      patchset << [a, change.new_position, change.old_element.stroke_diff(change.new_element)]
    elsif a == PATCH_MINUS
      patchset << [a, change.new_position]
    elsif a == PATCH_PLUS
      patchset << [a, change.new_position, change.new_element]
    end
    patchset
  end
  patchset.empty? ? nil : patchset
end

#stroke_merge(patch1, patch2) ⇒ Object 



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# File 'lib/strokedb/sync/diff/array.rb', line 38

def stroke_merge(patch1, patch2)
  unless patch1 && patch2
    return _stroke_automerged(stroke_patch(patch1 || patch2))
  end
  
  patch1 = patch1.dup
  patch2 = patch2.dup
  
  c1 = patch1.shift
  c2 = patch2.shift
  
  offset1 = 0
  offset2 = 0
  result = self.dup
  result1 = nil
  result2 = nil
  
  while c1 && c2
    while c1 && (p1 = c1[1] + offset1) && (p2 = c2[1] + offset2) && p1 < p2
      offset2 += _stroke_elementary_patch(result, p1, c1)
      c1 = patch1.shift
    end
    
    if p1 == p2
      raise "TODO conflict resolution!"
      
      c1 = patch1.shift
    end
    
    while c1 && c2 && (p1 = c1[1] + offset1) && (p2 = c2[1] + offset2) && p2 < p1
      offset1 += _stroke_elementary_patch(result, p2, c2)
      c2 = patch2.shift
    end
  end

  # Tail (one of two) 
  while c1
    offset2 += _stroke_elementary_patch(result, c1[1] + offset1, c1)
    c1 = patch1.shift
  end
  while c2
    offset1 += _stroke_elementary_patch(result, c2[1] + offset2, c2)
    c2 = patch2.shift
  end
  result ? _stroke_automerged(result) : _stroke_conflicted(result1, result2)
end

#stroke_patch(patch) ⇒ Object 



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# File 'lib/strokedb/sync/diff/array.rb', line 28

def stroke_patch(patch)
  return self unless patch
  return patch[1] if patch[0] == PATCH_REPLACE
  res = self.dup
  patch.each do |change|
    _stroke_elementary_patch(res, change[1], change)
  end
  res
end

#to_raw ⇒ Object 



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# File 'lib/strokedb/util/serialization.rb', line 4

def to_raw
  map do |v|
    v.respond_to?(:to_raw) ? v.to_raw : v
  end
end