module Rubocop::Cop::SurroundingSpace

def index_of_first_token(node)
  b = node.loc.expression.begin
  token_table[[b.line, b.column]]
end

def index_of_last_token(node)
  e = node.loc.expression.end
  (0...e.column).to_a.reverse.find do |c|
    ix = token_table[[e.line, c]]
    return ix if ix
  end
end

def space_between?(t1, t2)
  char_preceding_2nd_token =
    @processed_source[t2.pos.line - 1][t2.pos.column - 1]
  if char_preceding_2nd_token == '+' && t1.type != :tPLUS
    # Special case. A unary plus is not present in the tokens.
    char_preceding_2nd_token =
      @processed_source[t2.pos.line - 1][t2.pos.column - 2]
  end
  t2.pos.line > t1.pos.line || char_preceding_2nd_token =~ /[ \t]/
end

def token_table
  @token_table ||= begin
    table = {}
    @processed_source.tokens.each_with_index do |t, ix|
      table[[t.pos.line, t.pos.column]] = ix
    end
    table
  end
end