Micro Focus Enterprise Developer 2.3 Update 2 for Eclipse > Programming > Mainframe Programming > AppMaster Builder > Reference > Customizer/Micro Focus Generator (MFG) > Customizer Rule Examples > Example - Invoking Rules

Example - Invoking Rules

The following example shows two sample user rules - $CONSTRUCT-FD and $DAYDEF - and how a program invokes and uses them. To illustrate how AMB processes rules, we show the program at the following two stages of generation.

Restriction: This topic applies only when the AppMaster Builder AddPack has been installed, and applies only to Windows platforms.

Before AMB inserts the rule source in the program. The program at this stage is stored in the GENSRC directory or data set in your Project and Group.
After AMB inserts the rule source in the executable COBOL program.

The rules are defined in a USERMACS file. The $CONSTRUCT-FD rule writes FD statements. The program calls the rule and passes arguments--the FD file names--to the FD file name variable in the rule. The $DAYDEF rule builds a Working-Storage symbol table. The program repeatedly calls the rule and passes arguments--literal strings and their lengths--to the string and length variables in the rule.

User-defined rules:

% DEFINE $CONSTRUCT-FD( &FILE-NAME)
    FD  &FILE-NAME
        BLOCK CONTAINS 0 RECORDS
        LABEL RECORDS ARE STANDARD.
% END

% DEFINE $DAYDEF( &DAY, &LEN)
    % &DAYCTR = &DAYCTR + 1
    02  FILLER.
      03  FILLER          PIC S9(2) COMP SYNC VALUE +&LEN.
      03  FILLER          PIC X(9) VALUE &QT&DAY&QT.
% END

Program before rule source:

 % &REC-LEN = 121                                     315.
 % &DAYCTR = 0                                        316.
 % &QT = "'"                                          317.
                                                      318.
 IDENTIFICATION DIVISION.                             319.
 PROGRAM-ID.                     EXAMPLE3.            320.
*SPECIAL CONSIDERATIONS.                              321.
*    SAMPLE PROGRAM: CALLS TO RULES THAT WRITE        322.
*    AN FD STATEMENT AND BUILD A TABLE.               323.
                                                      324.
 ENVIRONMENT DIVISION.                                325.
 INPUT-OUTPUT SECTION.                                326.
 FILE-CONTROL.                                        327.
 SELECT INPUT-FILE           ASSIGN "INPUT".          328.
 SELECT OUTPUT-FILE          ASSIGN "OUTPUT".         329.
                                                      330.
 DATA DIVISION.                                       331.
 FILE SECTION.                                        332.
                                                      333.
 $CONSTRUCT-FD( 'INPUT-FILE')                         334.
 01  INPUT-RECORD                PIC X(&REC-LEN).     335.
                                                      336.
 $CONSTRUCT-FD( 'OUTPUT-FILE')                        337.
 01  OUTPUT-RECORD               PIC X(&REC-LEN).     338.
 WORKING-STORAGE SECTION.                             340.
                                                      341.
 01  DAY-TABLE.                                       342.
   $DAYDEF( 'SUNDAY', 6)                              343.
   $DAYDEF( 'MONDAY', 6)                              344.
   $DAYDEF( 'TUESDAY', 7)                             345.
   $DAYDEF( 'WEDNESDAY', 9)                           346.
   $DAYDEF( 'THURSDAY', 8)                            347.
   $DAYDEF( 'FRIDAY', 6)                              348.
   $DAYDEF( 'SATURDAY', 8)                            349 
 01  DAY-TABLE-REDEF   REDEFINES DAY-TABLE            350.
   02  DAY-ENTRY   OCCURS &DAYCTR.                    351.
     03  DAY-LEN   PIC S9(2) COMP SYNC.               352.
     03  DAY-BOL   PIC X(9).                          353.

Program after rule source:

030200                                                315 
030800                                                316.
031100                                                317.
031800                                                318.
031900 IDENTIFICATION DIVISION.                       319.
032000 PROGRAM-ID.                     EXAMPLE3.      320.
032100*SPECIAL CONSIDERATIONS.                                       
321.
032200*    SAMPLE PROGRAM: CALLS TO RULES THAT WRITE  322.
032300*    AN FD STATEMENT AND BUILD A TABLE          323.
032400                                                324.
032500 ENVIRONMENT DIVISION.                          325.
032600 INPUT-OUTPUT SECTION.                          326.
032700 FILE-CONTROL.                                  327.
032800 SELECT INPUT-FILE      ASSIGN "INPUT".         328.
032900 SELECT OUTPUT-FILE     ASSIGN "OUTPUT".        329.
033000                                                330.
033100 DATA DIVISION.                                 331.
033200 FILE SECTION.                                  332.
033300                                                333.
033400 FD  INPUT-FILE                                 334.
033402     BLOCK CONTAINS 0 RECORDS                   334.
033404     LABEL RECORDS ARE STANDARD.                334.
033500 01  INPUT-RECORD                PIC X(121).    335.
033600                                                336.
033700 FD  OUTPUT-FILE                                337.
033702     BLOCK CONTAINS 0 RECORDS                   337.
033704     LABEL RECORDS ARE STANDARD.                337.
033800 01  OUTPUT-RECORD               PIC X(121).    338.
033900                                                339.
034000 WORKING-STORAGE SECTION.                       340.
034100                                                341.
034200 01  DAY-TABLE.                                 342.
034300   02  FILLER.                                  343.
034302     03  FILLER   PIC S9(2) COMP SYNC VALUE +6. 343.
034304     03  FILLER   PIC X(9)  VALUE 'SUNDAY'.     343.
034400   02  FILLER.                                  344.
034402     03  FILLER   PIC S9(2) COMP SYNC VALUE +6. 344.
034404     03  FILLER   PIC X(9)  VALUE 'MONDAY'.     344.
034500   02  FILLER.                                  345.
034502     03  FILLER   PIC S9(2) COMP SYNC VALUE +7. 345.
034504     03  FILLER   PIC X(9)  VALUE 'TUESDAY'.    345.
034600   02  FILLER.                                  346.
034602     03  FILLER   PIC S9(2) COMP SYNC VALUE +9. 346.
034604     03  FILLER   PIC X(9)   VALUE 'WEDNESDAY'. 346.
034700   02  FILLER.                                  347.
034702     03  FILLER   PIC S9(2) COMP SYNC VALUE +8. 347.
034704     03  FILLER   PIC X(9)  VALUE 'THURSDAY'.   347.
034800   02  FILLER.                                  348.
034802     03  FILLER   PIC S9(2) COMP SYNC VALUE +6. 348.
034804     03  FILLER   PIC X(9)  VALUE 'FRIDAY'.     348.
034900   02  FILLER.                                  349.
034902     03  FILLER   PIC S9(2) COMP SYNC VALUE +8. 349.
034904     03  FILLER   PIC X(9)VALUE 'SATURDAY'.     349.
035000 01  DAY-TABLE-REDEF   REDEFINES DAY-TABLE.     349.
035100   02  DAY-ENTRY  OCCURS 7.                     351.
035200     03  DAY-LEN  PIC S9(2) COMP SYNC.          352.
035300     03  DAY-BOL  PIC X(9).                     353.