class RuboCop::Cop::Style::Semicolon

foo = 1; bar = 2
# good
@example AllowAsExpressionSeparator: true
foo = 1; bar = 2
# bad
@example AllowAsExpressionSeparator: false (default)
baz = 3
bar = 2
foo = 1
# good
baz = 3;
foo = 1; bar = 2;
# bad
@example
It allows ‘;` to separate several expressions on the same line.
This cop has `AllowAsExpressionSeparator` configuration option.
It also checks for lines terminated with a semicolon.
Checks for multiple expressions placed on the same line.

def self.autocorrect_incompatible_with

def self.autocorrect_incompatible_with
  [Style::SingleLineMethods]
end

def check_for_line_terminator_or_opener

def check_for_line_terminator_or_opener
  each_semicolon do |line, column, token_before_semicolon|
    register_semicolon(line, column, false, token_before_semicolon)
  end
end

def each_semicolon

def each_semicolon
  tokens_for_lines.each do |line, tokens|
    semicolon_pos = semicolon_position(tokens)
    after_expr_pos = semicolon_pos == -1 ? -2 : semicolon_pos
    yield line, tokens[semicolon_pos].column, tokens[after_expr_pos] if semicolon_pos
  end
end

def exist_semicolon_after_left_curly_brace?(tokens)

def exist_semicolon_after_left_curly_brace?(tokens)
  tokens[1]&.left_curly_brace? && tokens[2]&.semicolon?
end

def exist_semicolon_after_left_string_interpolation_brace?(tokens)

def exist_semicolon_after_left_string_interpolation_brace?(tokens)
  tokens[1]&.type == :tSTRING_DBEG && tokens[2]&.semicolon?
end

def exist_semicolon_before_right_curly_brace?(tokens)

def exist_semicolon_before_right_curly_brace?(tokens)
  tokens[-2]&.right_curly_brace? && tokens[-3]&.semicolon?
end

def exist_semicolon_before_right_string_interpolation_brace?(tokens)

def exist_semicolon_before_right_string_interpolation_brace?(tokens)
  tokens[-3]&.type == :tSTRING_DEND && tokens[-4]&.semicolon?
end

def expressions_per_line(exprs)

def expressions_per_line(exprs)
  # create a map matching lines to the number of expressions on them
  exprs_lines = exprs.map(&:first_line)
  exprs_lines.group_by(&:itself)
end

def find_range_node(token_before_semicolon)

def find_range_node(token_before_semicolon)
  range_nodes.detect do |range_node|
    range_node.source_range.contains?(token_before_semicolon.pos)
  end
end

def find_semicolon_positions(line)

def find_semicolon_positions(line)
  # Scan for all the semicolons on the line
  semicolons = processed_source[line - 1].enum_for(:scan, ';')
  semicolons.each do
    yield Regexp.last_match.begin(0)
  end
end

def on_begin(node)

def on_begin(node)
  return if cop_config['AllowAsExpressionSeparator']
  return unless node.source.include?(';')
  exprs = node.children
  return if exprs.size < 2
  expressions_per_line(exprs).each do |line, expr_on_line|
    # Every line with more than one expression on it is a
    # potential offense
    next unless expr_on_line.size > 1
    find_semicolon_positions(line) { |pos| register_semicolon(line, pos, true) }
  end
end

def on_new_investigation

def on_new_investigation
  return if processed_source.blank? || !processed_source.raw_source.include?(';')
  check_for_line_terminator_or_opener
end

def range_nodes

def range_nodes
  return @range_nodes if instance_variable_defined?(:@range_nodes)
  ast = processed_source.ast
  @range_nodes = ast.range_type? ? [ast] : []
  @range_nodes.concat(ast.each_descendant(:irange, :erange).to_a)
end

def register_semicolon(line, column, after_expression, token_before_semicolon = nil)

def register_semicolon(line, column, after_expression, token_before_semicolon = nil)
  range = source_range(processed_source.buffer, line, column)
  add_offense(range) do |corrector|
    if after_expression
      corrector.replace(range, "\n")
    else
      # Prevents becoming one range instance with subsequent line when endless range
      # without parentheses.
      # See: https://github.com/rubocop/rubocop/issues/10791
      if token_before_semicolon&.regexp_dots?
        range_node = find_range_node(token_before_semicolon)
        corrector.wrap(range_node, '(', ')') if range_node
      end
      corrector.remove(range)
    end
  end
end

def semicolon_position(tokens)

def semicolon_position(tokens)
  if tokens.last.semicolon?
    -1
  elsif tokens.first.semicolon?
    0
  elsif exist_semicolon_before_right_curly_brace?(tokens)
    -3
  elsif exist_semicolon_after_left_curly_brace?(tokens) ||
        exist_semicolon_after_left_string_interpolation_brace?(tokens)
    2
  elsif exist_semicolon_before_right_string_interpolation_brace?(tokens)
    -4
  end
end

def tokens_for_lines

def tokens_for_lines
  processed_source.tokens.group_by(&:line)
end