Script execution tail

Script execution tail
	Script execution

The script execution tail can be appended to each one of the script execution instructions described in the previous sections. It is used for special error handling.

The on_error:continue clause is used whenever a potential and anticipated runtime error during the execution of the called script should not terminate the execution of the calling script. In such a case the implicitly defined v_program_error_ variable can be used to detect runtime errors and take appropriate actions. See also Chapter 11, Runtime error handling for more information.

Syntax

Table 20.7. Script execution tail syntax

Production	Syntax	Links
`script_execution_tail`	`on_error_clause ?`	the section called “Script execution tail”
`on_error_clause`	`"on_error" ":" ( "exit_script" \| "continue" )` "remark: default value is `exit_script`

Examples

Example 20.5. Script execution tail examples

service instruction_examples

   command script_execution_tail_examples
      script
      
         var string result

         result = co_error_prone_command                    // exit immediately if a runtime error occors in co_error_prone_command

         result = co_error_prone_command on_error:continue  // continue if a runtime error occors in co_error_prone_command
         if v_program_error_ #r void then
            // appropriate error handling
            // ...
         end if

      end script
   end command


   command error_prone_command
      out result type:string end
      
      script
         // some instructions that risk to produce runtime errors
         // ...
      end script
   end command
 
end service


Script execution instruction		Flow control