Class: XPathSimplify

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

Class Method Summary collapse

Class Method Details

.append_previous(xp, i) ⇒ Object 



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# File 'lib/xpath-simplify.rb', line 61

def self.append_previous(xp, i)
  if i>1
    begin
    xp[i] = xp[i].gsub(' and //'," and #{xp[i-2]}//")
    xp[i] = xp[i].gsub(' or //'," or #{xp[i-2]}//")
    rescue
      # Do Nothing
   end
  end
  return xp[i]
end

.bracket_increment(arr, i) ⇒ Object 



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# File 'lib/xpath-simplify.rb', line 51

def self.bracket_increment(arr, i)
  counter = 0
  while i < arr.length do
    if arr[i] === '((' then counter += 1
    elsif arr[i] === '))' then if counter == 0 then return i; else counter -=1; end
    else i+=1; end
  end
  return arr.length
end

.convert(arr, f_attach, f_text) ⇒ Object 



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# File 'lib/xpath-simplify.rb', line 10

def self.convert (arr, f_attach, f_text)
  xp = Array.new
  i = 0
  f_attach = "//*" unless f_attach
  begin
  while i < arr.length do
    case arr[i]
    when '(('    then i += 1; xp[i] = convert(arr[i..arr.length], false, f_text); xp[i] = append_previous(xp, i); i = bracket_increment(arr,i)
    when '))'    then return xp.join('')
    when '->'    then i += 1; xp[i] = "[#{arr[i]}]"
    when '>>'    then i += 1; f_attach = xp[i-1]
    when '&&'    then if f_text then @f_and = true; return xp.join(''); else i += 1; xp[i] = " and #{convert(arr[i..arr.length], false, false)}"; i+=1; end
    when '||'    then if f_text then @f_or = true; return xp.join(''); else i += 1; xp[i] = " or #{convert(arr[i..arr.length], false, false)}"; i+=1; end
    when '::'    then if f_text then return xp.join(''); else i+=2; xp[i] = "#{f_attach}[contains(text(),'#{arr[i-1]}#{convert(arr[i..arr.length], f_attach, true)}')]"; i = text_increment(arr,i); end
    else              if f_text then xp[i] = " #{arr[i]}"
      else
        case arr[i]
        when /^#.+/                                                           then xp[i] = "#{f_attach}[@id='#{arr[i][1..-1]}']";
        when /^\..+/                                                          then xp[i] = "#{f_attach}[contains(@class,'#{arr[i][1..-1]}')]";
        when 'li', 'ul', 'a', 'span', 'button', 'input', 'label', 'textarea'  then xp[i] = "//#{arr[i]}"
        when /^\/.+/, /^http.*/, /^mailto.*/                                  then xp[i] = "#{f_attach}[contains(@href,'#{arr[i]}')]";
        else i+=1;                                                                 xp[i] = "#{f_attach}[contains(text(),'#{arr[i-1]}#{convert(arr[i..arr.length], f_attach, true)}')]"; i = text_increment(arr,i); end
      end
    end
    if    @f_and then @f_and = false
    elsif @f_or  then @f_or = false
    else  i += 1 end
  end
  rescue then return xp.join('')
  end
  return xp.join('')
end

.simplify(str) ⇒ Object 



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

def self.simplify (str)
  arr = str.split(/ /)
  @f_and = false
  @f_or = false
  xp = convert(arr, false, false)
  return xp
end

.text_increment(arr, i) ⇒ Object 



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# File 'lib/xpath-simplify.rb', line 43

def self.text_increment(arr, i)
  while i < arr.length do
    if arr[i] === '::' || arr[i] === '&&' || arr[i] === '||' || arr[i] === '((' || arr[i] === '))' || arr[i] === '->' || arr[i] === '>>'  then return i
    else i+=1 end
  end
  return arr.length
end