parse_tokens

in lib/elastic_apm/sql/signature.rb [63:133]

• 55 lines of code
• 25 McCabe index (conditional complexity)

      def parse_tokens
        t = @tokenizer

        case t.token

        when CALL
          return unless scan_until IDENT
          "CALL #{t.text}"

        when DELETE
          return unless scan_until FROM
          return unless scan_token IDENT
          table = scan_dotted_identifier
          "DELETE FROM #{table}"

        when INSERT, REPLACE
          action = t.text
          return unless scan_until INTO
          return unless scan_token IDENT
          table = scan_dotted_identifier
          "#{action} INTO #{table}"

        when SELECT
          level = 0
          while t.scan
            case t.token
            when LPAREN then level += 1
            when RPAREN then level -= 1
            when FROM
              next unless level == 0
              break unless scan_token IDENT
              table = scan_dotted_identifier
              return "SELECT FROM #{table}"
            end
          end

        when UPDATE
          
          
          return 'UPDATE' unless scan_token IDENT

          table = t.text

          period = false
          first_period = false

          while t.scan
            case t.token
            when IDENT
              if period
                table += t.text
                period = false
              end

              unless first_period
                table = t.text
              end

              
              
            when PERIOD
              period = true
              first_period = true
              table += '.'
            else
              return "UPDATE #{table}"
            end
          end
        end
      end