Class: XPathSimplify

Inherits:
Object
  • Object
show all
Defined in:
lib/xpath-simplify.rb

Class Method Summary collapse

Class Method Details

.assemble(arr) ⇒ Object 



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# File 'lib/xpath-simplify.rb', line 8

def self.assemble(arr)
  return "//*[contains(normalize-space(),'#{arr.join(' ')}')]" if check_only_text(arr)
  arr.each_with_index do |a,i|
    case a
    when '((', '))', '->', '>>', '&&', '||', '::'                         then next
    when /^#.+/                                                           then arr[i] = "//*[@id='#{arr[i][1..-1]}']";
    when /^\..+/                                                          then arr[i] = "//*[contains(@class,'#{arr[i][1..-1]}')]";
    when /\/[^\/].+/, /^http.*/, /^mailto.*/                              then arr[i] = "//*[contains(@href,'#{arr[i]}')]";
    else                                                                       next
    end
  end
  arr = combine_words(arr)
  arr.each_with_index do |a,i|
    case a
    when 'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'li', 'ul', 'a', 'span', 'button', 'input', 'label', 'textarea', 'tr', 'td', 'div' then arr[i] = "//#{arr[i]}";
    else                                                                       next
    end
  end
  arr = evaluate_array(arr, true)
  return arr.join('')
end

.check_only_text(arr) ⇒ Object 



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# File 'lib/xpath-simplify.rb', line 30

def self.check_only_text(arr)
  arr.each do |a|
    case a
    when '((', '))', '->', '>>', '&&', '||', '::'                       then return false
    else                                                                     next
    end
  end
  case arr[0]
  when '((', '))', '->', '>>', '&&', '||', '::', /^#.+/, /^\..+/        then return false
  when 'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'li', 'ul', 'a', 'span', 'button', 'input', 'label', 'textarea', 'tr', 'td', 'div' then return false
  when /\/[^\/].+/, /^http.*/, /^mailto.*/                              then return false
  else                                                                       return true
  end
end

.combine_words(arr) ⇒ Object 



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# File 'lib/xpath-simplify.rb', line 45

def self.combine_words(arr)
  f_text = -1
  arr.each_with_index do |a,i|
    case a
    when '((', '))', '->', '>>', '&&', '||'                               then next
    when /^\/\/\*.+/                                                      then next
    when '::'
      if f_text != -1
        arr[f_text] = arr[f_text][0..-2].to_s + "')]"
        f_text = -1
        arr[i] = nil
      else
        f_text = i
        arr[i] = "//*[contains(normalize-space(),'"
      end
    else
      if f_text != -1
        arr[f_text] = arr[f_text].to_s + arr[i].to_s + ' '
        arr[i] = nil
      else
        next
      end
    end
  end
  if f_text != -1 then arr[f_text] = arr[f_text][0..-2].to_s + "')]"; end;
  return arr.compact
end

.evaluate_and(arr, i, flag = false) ⇒ Object 



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# File 'lib/xpath-simplify.rb', line 146

def self.evaluate_and(arr,i,flag = false)
  if flag then arr[i] = "#{arr[i-1]} + //*#{arr[i+1][3..-1]}"
  else         arr[i] = "#{arr[i-1][0..-2]} and #{arr[i+1][4..-1]}"
  end
  arr[i-1] = nil
  arr[i+1] = nil
  return arr
end

.evaluate_array(arr, toplevel = false) ⇒ Object 



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# File 'lib/xpath-simplify.rb', line 73

def self.evaluate_array(arr,toplevel = false)
  arr = arr.compact
  arr.each_with_index do |a,i|
    case a
    when nil     then next
    when '(('
      targ = 0
      arr[(i+1)..arr.length].each_with_index do |b,j|
        if b == '))'
          targ = i+j+1
          break
        end
      end
      arr[i]=nil
      arr[targ]=nil
      temp = evaluate_array(arr[i+1..targ])
      for j in (0...temp.length) do
        arr[i+j] = temp[j];
      end
      for j in (i+temp.length)..(targ) do
        arr[j] = nil
      end
    when '))'    then return arr
    else              next
    end
  end

  arr = arr.compact
  arr.each_with_index do |a,i|
    case a
    when '->'    then arr = evaluate_index(arr,i)
    else         next
    end
  end

  arr = arr.compact
  arr.each_with_index do |a,i|
    case a
    when '>>'    then arr = evaluate_attach(arr,i)
    else         next
    end
  end

  arr = arr.compact
  arr.each_with_index do |a,i|
    case a
    when '&&'    then arr = evaluate_and(arr,i,toplevel)
    when '||'    then arr = evaluate_or(arr,i,toplevel)
    else         next
    end
  end

  return arr
end

.evaluate_attach(arr, i) ⇒ Object 



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# File 'lib/xpath-simplify.rb', line 139

def self.evaluate_attach(arr,i)
  arr[i] = "#{arr[i-1]}#{arr[i+1][3..-1]}"
  arr[i-1] = nil
  arr[i+1] = nil
  return arr
end

.evaluate_index(arr, i) ⇒ Object 



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# File 'lib/xpath-simplify.rb', line 128

def self.evaluate_index(arr,i)
  case arr[i+1].to_s
  when 'enabled'  then arr[i] = "#{arr[i-1]}[not (@disabled)]"
  when 'disabled' then arr[i] = "#{arr[i-1]}[(@disabled)]"
  else                 arr[i] = "#{arr[i-1]}[#{arr[i+1]}]"
  end
  arr[i-1] = nil
  arr[i+1] = nil
  return arr
end

.evaluate_or(arr, i, flag = false) ⇒ Object 



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# File 'lib/xpath-simplify.rb', line 155

def self.evaluate_or(arr,i,flag = false)
  if flag then arr[i] = "#{arr[i-1]} | //*#{arr[i+1][3..-1]}"
  else         arr[i] = "#{arr[i-1][0..-2]} or #{arr[i+1][4..-1]}"
  end
  arr[i-1] = nil
  arr[i+1] = nil
  return arr
end

.simplify(str) ⇒ Object 



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# File 'lib/xpath-simplify.rb', line 2

def self.simplify (str)
  arr = str.split(/ /)
  xp = assemble(arr)
  return xp
end