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