A code frame is the basic building block of a model. It provides a rudimentary outline of the code generated by the model. Code frames may contain condition codes to generate blocks of code conditionally. They may also contain subprograms used to generate more complex blocks of code.
This section describes how to access and use the Code Frame editor. The following topics are covered:
There are three methods you can use to access the Code Frame editor. These methods are:
To access the Code Frame editor from the Administration main
menu:
Type "F" in Function.
Press Enter.
The Code Frame menu is displayed. For example:
CSMMAIN N a t u r a l C o n s t r u c t CSMMNM0
Jul 05 Code Frame Menu 1 of 1
Functions
-----------------------------------------------
E Edit Code Frame
S Save Code Frame
L List Code Frames
P Purge Code Frame
C Clear Edit Buffer
H Print Saved Code Frame
? Help
. Return
-----------------------------------------------
Function ........... _
Code Frame ......... ________
Description ........ _____________________________________________
Command ............ __________________________________________________________
Enter-PF1---PF2---PF3---PF4---PF5---PF6---PF7---PF8---PF9---PF10--PF11--PF12---
help retrn quit main |
For information about the functions available through this menu, see Code Frame Menu Function.
Type "E" in Function.
Tip:
To edit an existing code frame, type the name of the code frame in
Code Frame before accessing the Code Frame editor.
Press Enter.
The Code Frame editor is displayed. For example:
Code Frame ......... SIZE
Description ........ FREE 61361
> > + ABS X X-Y _ S L
....+....1....+....2....+....3....+....4....+....5....+....6....+....7.. T C
....+....1....+....2....+....3....+....4....+....5....+....6....+....7.. T |
For information about modifying the supplied code frames, see Edit Code Frame.
You can also access the Code Frame editor from the Natural Next prompt (Direct command box for Unix).
To access the Code Frame editor from the command line:
Logon to the SYSCST library.
Enter the following command:
MENU F E/framename/framedescription |
You can also access the Code Frame editor from the Maintain Models panel.
To access the Code Frame editor from the Maintain Models panel:
Access the Administration main menu.
For information, see Access the Administration Main Menu.
Enter "M" in Function.
The Maintain Models panel is displayed.
Note:
For a description of this panel, see
Maintain Models
Function.
Move the cursor over the code frame you want to edit.
Press PF4 (frame).
The specified code frame is displayed in the Code Frame editor.
Note:
For information about editing code frames, see
Edit Code
Frame.
The following example shows the CSLC9 code frame in the Code Frame editor:
Code Frame ......... CSLC9 SIZE 29281
Description ........ Browse-Select* model subroutines FREE 29520
> > + ABS X X-Y _ S 408 L 1
Top...+....1....+....2....+....3....+....4....+....5....+....6....+....7.. T C
*
* Subroutines (in alphabetical order).
*
CHECK-WILD-CHARACTER 1
*********************************************************************** "
DEFINE SUBROUTINE CHECK-WILD-CHARACTER "
*********************************************************************** "
* "
* Check for wild characters in the input key and "
* reset minimum and maximum values for the key accordingly "
RESET #WILD-CHAR #LAST-POS "
FOR #WINDX = 1 TO 3 "
EXAMINE #INPUT.#CHAR-ARRAY(*) FOR "
CDWILDA.#WILD-CARD-CHARS(#WINDX) GIVING INDEX #FIRS-POS(#WINDX) "
END-FOR "
/* Find the first wild character "
FOR #WINDX = 1 TO 2 "
IF #FIRS-POS(#WINDX) = 1 THRU #FIRS-POS(#WINDX + 1) OR "
....+....1....+....2....+....3....+....4....+....5....+....6....+....7.. T |
The Code Frame editor supports all generic Natural edit commands except the RUN, CHECK, TEST, STOW, and SAVE commands. This editor has no line numbers, but it does have two extra fields to the right of the edit area: T (Type) and C (Condition). Natural Construct uses these fields to control the generation process for each code frame.
The fields in the Code Frame editor are
| Field | Description |
|---|---|
| Code Frame | Name of the code frame currently in the editor (the name specified in Code Frame on the Code Frame menu). |
| Description | Brief description of the code frame. |
| SIZE | Size of the code frame (in bytes). |
| FREE | Number of bytes currently available in the editor. |
| > | Command line prompt, at which you can:
|
| + | Direction indicator. The plus sign (+) indicates
that the ADD, MOVE, COPY, INSERT, and SCAN commands operate in a forward (from
top to bottom) direction. To have the commands operate in a backward direction
(from bottom to top), type a minus sign (-) over the plus sign.
Edit commands use the direction indicator to determine whether to place lines before the first line in the editor or after the last line. For example, using the ADD edit command and a + indicator adds lines after the last line in the editor; using the ADD edit command and a - direction indicator adds lines before the first line in the editor. |
| ABS | Absolute field, which is used in conjunction with the SCAN and CHANGE edit commands. When this field is marked, the system scans for or changes the specified characters, including those within words. If you specify a blank in this field, the system scans for or changes the specified characters only if they are a separate entity (delimited by blanks or special characters). |
| X-Y | X and Y delimiters for a block of code. To confine SCAN and CHANGE commands to code within an X-Y delimited range, mark this field. Code outside the X-Y range is not affected. |
| S | Total number of lines of code currently in the editor. |
| L | Number of the first line currently displayed in the editor. |
| T | Editor line type. Valid line types are:
|
| C | Condition level of the corresponding lines. Valid
levels are:
|
This section covers the following topics:
This section describes how to use commands in the Code Frame editor. The following topics are covered:
The Code Frame editor executes commands in the following order:
Processes text modifications.
Executes line commands.
These commands are specified in the text area of the editor and are preceded with a period (.E, for example).
Executes edit commands.
These commands are specified at the > prompt (ADD, for example).
Within the Code Frame editor, you can issue line commands to copy, move, and delete lines of code. Line commands must be entered in the first column position of a line in the edit area (not at the > prompt) and must begin with a period (.).
Note:
Except for the .L command, you should only issue line commands on
modified code after you press Enter.
If the direction indicator is + (indicating from top to bottom), the copied, moved, or inserted lines are placed below the line on which the command is entered. If the direction indicator is - (indicating from bottom to top), the lines are placed above the line on which the command is entered.
Note:
To avoid shifting the T (Type) and C (Condition) fields, the SHIFT,
.J, and .S commands are not available in the Code Frame editor.
The line commands applicable in the Code Frame editor are:
| Command | Function |
|---|---|
| .C(nn) | Copies the current line nn times, where nn is the number of times. The default is one time. |
| .CX(nn) | Copies the line marked X nn times, where nn is the number of times. The default is one time. |
| .CY(nn) | Copies the line marked Y nn times, where nn is the number of times. The default is one time. |
| .CX-Y(nn) | Copies the block delimited by X and Y nn times, where nn is the number of times. The default is one time. |
| .D(nn) | Deletes nn lines, where nn is the number of lines. The default is one line. |
| .E | Specifies additional attributes for user exits. If the corresponding line is type U (user exit point), you can specify additional attributes for the user exit by issuing the .E command. |
| .G(model, parameters) | Invokes the Natural Construct Generation subsystem. |
| .I(nn) | Inserts nn lines, where nn is the number of lines. The default is 9 lines; the maximum is 9 lines. The Code Frame editor suppresses unused lines unless they are marked with a B line type. |
| .IF (code frame name) | Inserts the specified code frame on the line
below the line on which the command is specified.
Note: |
| .I(member,startline,number of lines) | Places a member from the current library onto a specified line in the editor. You can also specify a starting line and the total number of lines to include. |
| .L | Restores the line on which the command is specified to its previous state. (This command is similar to the LET edit command, except it applies to one line only.) |
| .MX | If the direction indicator is +, this command moves the line marked X to the line below the one on which .MX is specified. If the indicator is -, this command moves the line marked X to the line above. |
| .MY | If the direction indicator is +, this command moves the line marked with Y to the line below the one on which .MY is specified. If the direction indicator is -, this command moves the line marked Y to the line above. |
| .MX-Y | Moves the block of lines delimited by the X and Y markers. If the direction indicator is +, this command moves the block to the line below the one on which .MX-Y is specified. If the direction indicator is -, this command moves the block to the line above. |
| .N | Marks the line for the POINT edit command (for information on the POINT command, see Positional Edit Commands). |
| .P | Moves the line on which the command is specified to the top of the panel. |
| .W(nn) | Inserts nn blank lines in the editor, where nn is the number of lines. The default is 9 lines. Whenever the code frame is updated, Natural Construct suppresses any unused lines unless they are marked as B line types. |
| .X | Marks a line, or marks the beginning of a block of lines, that ends with a line marked Y. |
| .Y | Marks a line, or marks the end of a block of lines, that begins with a line marked X. |
Edit commands are specified at the command prompt (>). These commands are:
| Command | Function |
|---|---|
| ADD | Adds 9 blank lines to the editor. |
| CHANGE | Scans for text and replaces it with the
specified value. The syntax is:
CHANGE 'scanvalue'replacevalue' You can use any special character as a delimiter, as long as you do not use the same character within the command. Note: |
| CLEAR | Clears the current contents of the edit buffer. |
| DX | Deletes the line marked X. |
| DY | Deletes the line marked Y. |
| DX-Y | Deletes the lines between the X and Y markers, inclusively. |
| END | Ends the edit session and invokes the previous menu. |
| EX | Deletes all lines before the X marker. |
| EY | Deletes all lines after the Y marker. |
| EX-Y | Deletes all the lines before the X marker and after the Y marker. |
| HELP | Displays help text for the Code Frame editor. |
| LET | Restores lines to their previous state, should you inadvertently change them. Specify the command before pressing Enter. (This command is similar to the .L line command, but applies to the entire buffer.) |
| LIST | Lists the current contents of the Main buffer. |
| PROFILE | Invokes a window in which you can modify PF-key settings and edit specifications for the current edit session (see Change the PF-Key Profile for the Current Session). |
| QUIT or . | Ends the edit session and invokes the previous menu. |
| READ program | Reads the Natural source for program into the edit buffer. |
| RESET | Clears the X and Y markers. |
| SCAN | Scans for data in the edit area in the
following ways:
SCAN 'scanvalue Scans for text within the delimiters. SCAN scan value Scans for the entire text after the SCAN keyword, including spaces. Note: If the direction indicator is "+", the scan begins at the first line displayed on the panel and continues to the end of the text. If the indicator is "-", the scan begins at the last line and continues to the beginning. When the scan value is found, "S" is displayed in the left column next to the target line(s). Note: |
| UPPER | Invokes a window in which you can specify one
or more of the following translation options:
|
| * | Redisplays the last command issued. |
If the code frame in the edit buffer is too large to be displayed in its entirety on the panel, you can issue edit commands at the command prompt (>) to scroll through the code:
| Command | Function |
|---|---|
| +nnnn or -nnnn | Scrolls forward (+) or backward (-) nnnn lines. |
| +H or -H | Scrolls forward (+) or backward (-) half a panel. |
| +P or -P | Scrolls forward (+) or backward (-) one panel.
Note: |
| BOTTOM or ++ | Scrolls forward to end of code frame. |
| POINT | Scrolls line on which the .N line command is specified to top of panel. |
| TOP or – | Scrolls backward to top of panel. |
| X or Y | Scrolls to the line marked X or Y. |
| nnnn | Scrolls to the nnnn line. |
You can change the PF- and PA-key settings, the number of updates before an automatic save, and the name of the recovery member. Any changes to the current profile take effect immediately and remain in effect for the duration of the current edit session. These changes do not affect the Natural edit profile.
To change the PF-key profile for the current session:
Enter "PROFILE" at the > prompt in the Code Frame editor.
The Maintain Current PF-Key Profile window is displayed. For example:
CS-PROF Natural Construct CS-PRFM0
Jun 20 Maintain Current PF-Key Profile 1 of 1
PF1 = -______________ PF2 = T______________ PF3 = B______________
PF4 = -H_____________ PF5 = +H_____________ PF6 = +P_____________
PF7 = N______________ PF8 = _______________ PF9 = Q______________
PF10= _______________ PF11= _______________ PF12= _______________
PF13= _______________ PF14= _______________ PF15= _______________
PF16= _______________ PF17= _______________ PF18= _______________
PF19= _______________ PF20= _______________ PF21= _______________
PF22= _______________ PF23= _______________ PF24= _______________
PA1 = _______________ PA2 = SCAN___________ PA3 = _______________
Auto save numbers ............ In member .......... EDITWORK
Enter-PF1---PF2---PF3---PF4---PF5---PF6---PF7---PF8---PF9---PF10--PF11-
help retrn
Changes DO NOT affect your edit profile outside Construct |
This window displays the various settings in effect for the current edit session. The PF-key settings for the Natural Construct editors are determined in the same manner as those for the Natural editor. If you have a profile that corresponds to your user ID, Natural Construct will use those defaults.
Change the settings as desired.
The fields in this window are:
| Field | Description |
|---|---|
| PF-nn or PA-n | Functions assigned to the PF- and PA- keys. You can add new functions by typing a command next to the desired key, or modify existing functions by typing a new command over the one displayed. |
| Auto save numbers | Number of updates allowed before the source is automatically saved. If this field is blank or 0 (zero), Natural Construct does not automatically save work. |
| In member | Name of the program that is overwritten each time the specified number of updates is exceeded (by default, EDITWORK). To change the name of the program, type a new name over the one displayed. If this field is blank, Natural Construct does not automatically save work. |
The Natural Construct editors can automatically save work in the edit buffer after a certain number of updates. The number specified in Auto save numbers in the Maintain Current PF-Key Profile window determines how often the work is saved. If this field is blank, Natural Construct does not automatically save work. You can also use In member in the Maintain Current PF-Key Profile window to specify the name of the recovery member where you want your work saved.
To recover edits, the value in Auto save numbers must not be blank or 0 (zero) and the value in In member must be specified. For information, see Change the PF-Key Profile for the Current Session.
Tip:
Save your work using a unique recovery member name, such as your user
ID. This way, your work will not be overwritten by another user using the same
recovery member name in the same library.
To retrieve lost code:
Access the Code Frame editor.
For information, see Access the Code Frame Editor.
Read EDITWORK into the edit buffer (or whatever name you specified as your recovery member name in the Maintain Current PF-Key Profile window).
Re-specify the description, as it is not saved in the recovery member.
Sample subprograms are invoked from a user exit. These subprograms help the developer create user exit code by providing a starting sample. The GUI sample subprogram is a client version of the mainframe sample subprogram — minus the input statements. When Natural Construct generates a model on the client, it bypasses the mainframe sample subprogram and reads the GUI sample subprogram instead.
