using input as

control structure

Syntax
using input as source expression
   block


Purpose

You can use using input as to establish a new current input scope without actually initiating scanning of the data source belonging to that scope. This is useful if you want to establish the input scope in which a function will be called, or if you want to establish a single source on which you will perform a number of scanning operations in succession.

The following code uses using input as to establish the input scope for a function: 

  define integer function sum-of-csv
      as
      local integer sum initial {0}
      repeat scan #current-input
          match white-space* 
                digit+ => number
                white-space*
                ","?
              set sum to sum + number
      again              
      return sum
  
  process
     local integer total
     using input as file "numbers.csv"
      set total to sum-of-csv

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