module SCSSLint
  # Checks for the presence of spaces between parentheses.
  class Linter::SpaceBetweenParens < Linter
    include LinterRegistry

    def visit_root(node)
      @spaces = config['spaces']
      engine.lines.each_with_index do |line, index|
        line.scan /(\( *[^ ]|[^\s] *\))/ do |match|
          match.each { |str| check(str, index, engine) }
        end
      end
    end

  private

    def check(str, index, engine)
      spaces = str.count ' '

      if spaces != @spaces
        @lints << Lint.new(engine.filename, index + 1, "Expected #{pluralize(@spaces, 'space')}" <<
                                                       " between parentheses instead of #{spaces}")
      end
    end
  end
end