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REPLACE function for strings in Sage X3 adonix

Origen: https://en.sagedev.it/sagex3/strings-replace-function/

Autor: 

Adonix does not provide an instruction for replacing a string part.
The only existent instruction is
ctrans(STR,"AB","C")
that substitutes into the STR string all occurrences of ‘A’ and ‘B’ letters into ‘C’ letter.
Note that it does not replace string “AB”, but all occurrences of ‘A’ letter and all occurrences of ‘B’ letter.
We remedy this miss implementing a REPLACE function and a his wrapper too,
so we can manage with the same code both simple strings both clobs.

#
#File YSAGEDEV
#

#############################################################################
# Author: SageDev.it
# It substitutes all occurrences of OLD with NEW
# STR is a clob
#############################################################################
Funprog REPLACE(STR, OLD, NEW)
    Value Clbfile STR()
    Value Char OLD()
    Value Char NEW()
    Local Integer LENOLD
    Local Integer LENNEW

    #length of string to substitute
    LENOLD= len(OLD)
    #length of string that will substitute OLD string
    LENNEW= len(NEW)

    If LENOLD<=0 or LENOLD>len(STR)
        #the string to substitute is empty or it is longer than initial string, so we do nothing
        End STR
    Endif

    Local Integer INDEX
    Local Integer INDEXSTART

    #We search the string to substitute
    INDEX=instr(1,STR,OLD)

    While INDEX>0
        #INDEX>0 this means that we have found an occurrence of OLD
        #We substitute OLD occurrence with the NEW string
        STR =left$(STR, INDEX-1) + NEW + right$(STR, INDEX+LENOLD)

        #We calc the index to which the NEW string just inserted ends
        INDEXSTART=INDEX+LENNEW

        #We search the string to substitute starting from the end of last found occurrence
        INDEX=instr(INDEXSTART,STR,OLD)
    Wend
End STR
#############################################################################

#############################################################################
# Author: SageDev.it
# Wrapper of REPLACE(STR, OLD, NEW)
# It substitutes all OLD occurrence with NEW
# the STR parameter is a CHAR(), not a clob
#############################################################################
Funprog REPLACESTR(STR, OLD, NEW)
    Value Char STR()
    Value Char OLD()
    Value Char NEW()

    Local Char RET(250)
    Local Clbfile STRCLB(1)
    STRCLB = STR
    RET = func YSAGEDEV.REPLACE(STRCLB, OLD, NEW)
End RET
#############################################################################

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