MultiLineKey ( input ; size ; output )

Takes an 'input' string of text and converts it into multi-line key values

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Peter Roots
N/A
N/A

Sample input:

MultiLineKey ( "ABCDE" ; 3 ; "" )

Sample output:

A
AB
ABC
ABCDE

Function definition: (Copy & paste into FileMaker's Edit Custom Function window)

Let (

[

most_recent_value = // the string that was most recently derived
GetValue ( output ; ValueCount ( output ) ) ;

this_iteration = // the string derived in this iteration of the function
most_recent_value & Left ( input ; 1 ) ;

process_next = // the remains of the input string, yet to be processed
Case ( 
  Length ( input ) > 1 ;
  Right ( input ; Length ( input ) - 1 )
) ;

cumulative_output = // all strings derived thus far
Case ( 
  not IsEmpty ( output ) ;
  output & ¶
) & 
this_iteration ;

result = 
Case ( 
  size = 0 ;
  "" ;
  IsEmpty ( process_next ) or Length ( this_iteration ) >= size ;
  cumulative_output & Case ( not IsEmpty ( process_next ) ; ¶ & this_iteration & process_next ) ;
  MultiLineKey ( process_next ; size ; cumulative_output )
)

]

;

result

)

Takes an 'input' string of text and converts it into multi-line key values, suitable for matching to in a relationship.
The function will derive component strings up to the length specified by the 'size' parameter. If 'size' is zero, the result is "". If the whole string hasn't been processed when the 'size' (length) has been reached, the result will include the derived strings up to that length plus the original string value.

Parameters:
input = remaining text to be processed; initially the full string value
size = maximum number of characters from the initial string to be processed
output = text that has been processed; initially blank

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Note: these functions are not guaranteed or supported by BrianDunning.com. Please contact the individual developer with any questions or problems.

MultiLineKey ( input ; size ; output )

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