Class: String

Inherits:
Object
  • Object
show all
Defined in:
lib/3rdparty/aelexer/string.rb

Direct Known Subclasses

Ruvi::BufferLine

Instance Method Summary collapse

Instance Method Details

#balance_backward(re, pair_open, pair_close, balance = 0, &block) ⇒ Object

return types match.…. Array = [x, y] position mismatch.. Fixnum = balance



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# File 'lib/3rdparty/aelexer/string.rb', line 19

def balance_backward(re, pair_open, pair_close, balance=0, &block)
  s = self
  y = 0
  while s
    $logger.debug(2) { "str=#{s.inspect}   bal=#{balance}" }
    x = s.size
    s.split(re).reverse_each do |token|
      x -= token.size
      case token
      when pair_close
        balance += 1
      when pair_open
        balance -= 1
        return balance if balance < 0
        return [x, y] if balance == 0
      end
    end
    return balance unless block_given?
    y -= 1
    s = block.call(y)
  end # loop
  balance
end

#balance_forward(re, pair_open, pair_close, balance = 0, &block) ⇒ Object

return types match.…. Array = [x, y] position mismatch.. Fixnum = balance



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# File 'lib/3rdparty/aelexer/string.rb', line 60

def balance_forward(re, pair_open, pair_close, balance=0, &block)
  s = self
  y = 0
  while s
    $logger.debug(2) { "str=#{s.inspect}   bal=#{balance}" }
    x = 0
    # TODO: split is inefficient.. use scan
    s.split(re).each do |token|
      case token
      when pair_open
        balance += 1
      when pair_close
        balance -= 1
        return balance if balance < 0
        return [x, y] if balance == 0
      end
      x += token.size
    end
    return balance unless block_given?
    y += 1
    s = block.call(y)
  end # loop
  balance
end

#expand_tabs(tabsize) ⇒ Object 



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# File 'lib/3rdparty/aelexer/string.rb', line 84

def expand_tabs(tabsize)
  res = ""
  self.split(/(\t)/).each do |txt|
    if txt == "\t"
      n = tabsize - (res.size % tabsize)
      res << ("\t" * n)
    else
      res << txt
    end
  end
  res
end

#match_bracket(position, &block) ⇒ Object 



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# File 'lib/3rdparty/aelexer/string.rb', line 96

def match_bracket(position, &block)
  pairs = [%w|( )|, %w|[ ]|, %w|< >|, %w|{ }|]
  
  str_right = self[position, self.size-position]   
  re_right = Regexp.new(
    '\A[^' +
    pairs.flatten.map{|i|Regexp.escape(i)}.join +
    ']*([' +
    pairs.transpose[1].map{|i|Regexp.escape(i)}.join +
    '])'
  )
  match_right = str_right.match(re_right)
  bal_right = match_right ? 1 : 0
  
  str_left = self[0, position]
  re_left = Regexp.new(
    '([' +
    pairs.transpose[0].map{|i|Regexp.escape(i)}.join +
    '])[^' +
    pairs.flatten.map{|i|Regexp.escape(i)}.join +
    ']*\z'
  )
  match_left = str_left.match(re_left)
  bal_left = match_left ? 1 : 0
  
  $logger.debug(2) { "#{str_left.inspect} (#{bal_left} - " + 
    "#{bal_right}) #{str_right.inspect}"}

  # determine what to search for
  symb_left = nil
  symb_right = nil
  pair_n_left = nil
  pair_n_right = nil
  if match_right
    symb_right = match_right[1]
    pair_n_right = pairs.transpose[1].index(symb_right)
  end
  if match_left
    symb_left = match_left[1]
    pair_n_left = pairs.transpose[0].index(symb_left)
  end
  pair_n = pair_n_right || pair_n_left
  pair = nil
  pair = pairs[pair_n] if pair_n
  $logger.debug(2) { "input=\"#{str_left}  #{str_right}\"  " + 
    "left=#{symb_left.inspect} " +
    "right=#{symb_right.inspect} " +
    "pair=#{pair.inspect}" }
    
  # look for matching close parentesis
  re_reset = Regexp.new(
    '[' +
    pairs.flatten.map{|i|Regexp.escape(i)}.join +
    ']'
  )
  if str_right.match(re_reset)
    $logger.debug(2) { "reseting left balance" }
    bal_left = 0
  end
  pair1 = pair
  unless pair1
=begin
    re = Regexp.new(
      '\A[^' +
      pairs.transpose[0].map{|i|Regexp.escape(i)}.join +
      ']*([' +
      pairs.transpose[0].map{|i|Regexp.escape(i)}.join +
      '])'
    )
    m = str_right.match(re)
    if m
      pair1 = pairs[pairs.transpose[0].index(m[1])]
      $logger.debug(1) { "forward with pair #{pair1.inspect}"}
=end

      re = Regexp.new(
        '[' +
        pairs.transpose[0].map{|i|Regexp.escape(i)}.join +
        ']'
      )
      $logger.debug(2) { "reg = #{re.source}" }
      m2 = str_right.match(re)
      if m2
        pair1 = pairs[pairs.transpose[0].index(m2.to_s)]
        $logger.debug(2) { "forward with better pair #{pair1.inspect}" }
      end
    #end
  end
  location = str_right.paren_forward(bal_left, pair1, &block)
  if location
    x, y = location
    x += position if y == 0
    if y != 0 or (y == 0 and x != position)
      $logger.debug(2) { "forward match at (#{x},#{y})" }
      return [y, x]
    else
      $logger.debug(2) { "canceling match" }
    end
  else
    $logger.debug(2) { "no forward match" }
  end
  re_bailout = Regexp.new(
    '\A[^' + 
    pairs.transpose[1].map{|i|Regexp.escape(i)}.join +
    ']*[' +
    pairs.transpose[0].map{|i|Regexp.escape(i)}.join +
    ']'
  )
  #return nil if str_right.match(/\A[^\)]*\(/)
  if str_right.match(re_bailout)
    $logger.debug(2) { "bailout" }
    return nil
  end
  # look for matching open parentesis
  pair2 = pair
  unless pair2
    re = Regexp.new(
      '([' +
      pairs.transpose[1].map{|i|Regexp.escape(i)}.join +
      '])[^' +
      pairs.transpose[1].map{|i|Regexp.escape(i)}.join +
      ']*\z'
    )
    m = str_left.match(re)
    if m
      pair2 = pairs[pairs.transpose[1].index(m[1])]
      $logger.debug(2) { "found backward pair #{pair2.inspect}" }
    end
  end
  location = str_left.paren_backward(bal_right, pair2, &block)
  if location
    x, y = location
    $logger.debug(2) { "backward match at (#{x},#{y})" }
    return [y, x]
  end
  $logger.debug(2) { "no match" }
  nil
end

#paren_backward(balance = 0, pair = nil, &block) ⇒ Object 



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# File 'lib/3rdparty/aelexer/string.rb', line 2

def paren_backward(balance=0, pair=nil, &block)
  pair ||= ['(', ')']
  return nil if balance == 0 and not self.include?(pair.last)
  re = Regexp.new("([" + pair.map{|i|Regexp.escape(i)}.join + "])")
  result = balance_backward(
    re,
    pair.first,
    pair.last,
    balance,
    &block
  )
  return result if result.kind_of?(Array)
  nil  # otherwise ignore balance 
end

#paren_forward(balance = 0, pair = nil, &block) ⇒ Object 



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# File 'lib/3rdparty/aelexer/string.rb', line 42

def paren_forward(balance=0, pair=nil, &block)
  pair ||= ['(', ')']
  $logger.debug(2) { "forward  pair=#{pair.inspect}  str=#{self.inspect}" }
  return nil if balance == 0 and not self.include?(pair.first)
  re = Regexp.new("([" + pair.map{|i|Regexp.escape(i)}.join + "])")
  result = self.balance_forward(
    re,
    pair.first,
    pair.last,
    balance,
    &block
  )
  return result if result.kind_of?(Array)
  nil  # otherwise ignore balance 
end