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REMOVE

Description

REMOVE will successively extract delimited strings from a dynamic array. 

REMOVE variable FROM array SETTING setvar

Where:

variable is the variable, which is to receive the extracted string.

array is the dynamic array from which the string is to be extracted.

setvar is set by the system during the extraction to indicate the type of delimiter found:

0
end of the array
1
xFF ASCII 255
2
xFE ASCII 254 Field marker
3
xFD ASCII 253 Value marker
4
xFC ASCII 252 Subvalue marker
5
xFB ASCII 251
6
xFA ASCII 250
7
xF9 ASCII 249


The first time the REMOVE statement is used with a particular array, it will extract the first delimited string it finds and set the special "remove pointer" to the start of the next string (if any). The next time REMOVE is used on the same array, the pointer will be used to retrieve the next string and so on. The array is not altered.

The variable named in the SETTING clause is used to record the type of delimiter that was found - to help determine whether the REMOVE statement extracted a field, a value or a subvalue for example.

Delimiters are defined as characters between xF9 and xFF only. Once the end of the array has been reached, the string variable will not be updated and the SETTING clause will always return 0. The "remove pointer" may be reset by assigning the variable to itself - for example REC = REC.

An example of use is as: 

EQU FM TO CHAR (254), VM to CHAR(253), SVM to CHAR(252)
REC = "Field 1":FM:"Value 1":VM:" Value 2":FM:"Field 3"
REMOVE EXSTRING FROM REC SETTING DELIM
REMOVE EXSTRING FROM REC SETTING DELIM

The first time REMOVE is used, EXSTRING will contain "Field 1" and DELIM will contain xFE. The second time REMOVE is used, EXSTRING will contain "Value 1" and DELIM will contain xFD.


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