Version 6.3.8 for OpenVMS
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Conversion Program HTML to Natural

This section describes the use of HTML to Natural, a program that enables you to convert an HTML page into a Natural subprogram for use with Natural Web Interface.

Using HTML to Natural to generate Natural code from an HTML page avoids you having to adapt HTML input to the conventions of Natural code. You can then move the "HTML-page-turned-subprogram" to the server, including all the other Natural program logic you have added. If you want to change the HTML page again, go back to your source, convert it and move it to the server again. This is much easier than writing HTML with a browser, moving it to the server, adding Natural program logic and reiterating the process if your HTML page changes.

This section covers the following topics:


Using the Conversion Program

If your basic web pages are designed with editing tools, it takes some effort to include such a page in a Natural subprogram that can be called from the Web.

"HTML to Natural" is a program that uses an HTML page as input and generates a Natural subprogram, which can be called by the Natural Web Server Extensions using the Natural Web Interface.

09:57:28               ***** HTML to Natural *****                  2005-02-14
                              - Main Menu -                     Library SYSWEB



 Input File:
 /nat/natc/611/samples/sysweb/*.htm_________________________________________  
  
  
 Output to Natural
 Library .......... SYSWEB
 Object type ...... N
 Object ........... ________ 
 Subroutine name .. ________________________________
          
          
          
          
          
          
          
 Select HTML file for generation.
Enter-PF1---PF2---PF3---PF4---PF5---PF6---PF7---PF8---PF9---PF10--PF11--PF12---
      Help        Exit              Class             Test  Opt.  Save  Canc

Below is information on:

Functions and Keys

Key Function Explanation
PF1 Help Invokes the Help function for the field at which the cursor is positioned.
PF3 Exit Leaves the program and returns to the command line.
PF6 Class Starts the program that generates a DCOM Class.
PF9 Test Starts the Online Test Utility (see the relevant section).
PF10 Opt. Options. Specifies options for the generation process.
PF11 Save Saves the selected input and output files as default Natural parameters.
  Next Starts generating the program.
ENTER  

Generating a Subprogram/Subroutine to be called direct from the Web

Start of instruction setTo generate a subprogram/subroutine to be called direct from the Web

  1. Select your HTML page.

  2. Close the Natural library you want to generate.

  3. Select the object type you want to generate.

  4. Select your Natural file name.

  5. Start the generation.

  6. After generation, you can call the Natural Web Interface to show the page.

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Inserting a Natural Tag

If you use Natural on your HTML page, it is possible to specify your special Natural coding direct in the HTML page. After generation, the program needs no additional changes.

The HTML2NAT program can recognize a <NATURAL> tag. All lines between <NATURAL> and </NATURAL> will be copied, as they are, to the generated Natural source object.

Appearance

<NATURAL> </NATURAL>

Below is information on:

Attributes DATA, LDA, GDA, SUB, NOT

Listed below are attributes provided to define coding sections that are to be moved within the program or excluded from the program.

Attribute Explanation
DATA <NATURAL DATA> or <NATURAL LDA> moves the defined section to the DEFINE DATA LOCAL part of your program.
LDA
GDA <NATURAL GDA> moves the defined section to the DEFINE DATA GLOBAL part of your program.
SUB <NATURAL SUB> moves the defined section to the end of the program. This enables you to specify inline subroutines.
NOT <NATURAL NOT> excludes the defined section from the program. This enables you to specify the design of part of a page that will be generated by a program.

Comment Tag

Use the comment tag <!-- --> to hide the display of defined sections of your coding. If you use the comment tag and <NATURAL NOT>, you can display the predefined page with a normal browser. This helps you to specify your page and replace parts of the page dynamically.

ASP-like Script Commands

With the current version of HTML2NAT, not only <NATURAL> and </NATURAL> can be used but also ASP-like (Active Server Page) script commands which are differentiated from the text by using the <% and %> delimiters.

Additional Script Directives

The following Natural-specific directives must be used when writing a Natural subprogram:

Output directive: <%= ... %>

Short form for <% PERFORM W3HTML ... %> tag

Subprogram directive: <%SUB ... %>

equal to the <NATURAL SUB> ... </NATURAL> tag

Global Data Area directive: <%GDA ... %>

equal to the <NATURAL GDA> ... </NATURAL> tag

directive: <%LDA ... %>

equal to the <NATURAL LDA> ... </NATURAL> tag

Not directive: <%NOT ... %>

equal to the <NATURAL NOT> ... </NATURAL> tag

Processing directive <%@ LANGUAGE=NATURAL %>

indicates that the used language is Natural.

Example 1 of a Simple Generation

HTML document:

<HTML><HEAD><TITLE>
Example1 genNat
</TITLE></HEAD><BODY><H2>
Example1 genNat
</H2><HR>
<P>This is for your output
</BODY></HTML>

Generated Natural subprogram:

* ----- SUBPROGRAM generated out of file:
* ----- C:\example1.html
DEFINE DATA
PARAMETER USING W3PARM
LOCAL USING W3CONST
LOCAL
* ----- PRIVATE VARIABLES -----
1 W3VALUE (A250)
END-DEFINE
*
* ----- ERROR HANDLER -----
ON ERROR
  PERFORM W3ERROR ##W3ERROR
  PERFORM W3END ##RPC
  ESCAPE ROUTINE
END-ERROR
* ----- INITIALIZE HTTP API -----
PERFORM W3INIT ##RPC
* ----- HEADER FOR SERVER -----
PERFORM W3CONTENT-TYPE 'text/html'
*
* ----- MAIN PROGRAM -----
PERFORM W3TEXTLINE'<HTML><HEAD><TITLE>'
PERFORM W3TEXTLINE 'Example genNat'
PERFORM W3TEXTLINE'</TITLE></HEAD><BODY><H2>'
PERFORM W3TEXTLINE 'Example genNat'
PERFORM W3TEXTLINE '</H2><HR>'
PERFORM W3TEXTLINE '<P>This is for your output'
PERFORM W3TEXTLINE '</BODY></HTML> '
* ----- END HTTP API -----
PERFORM W3END ##RPC
* ----- END MAIN PROGRAM -----
*
*
* ----- SUBROUTINES -----
END

Example 2 of a Simple Generation with a Natural Tag

HTML document:

<HTML><HEAD><TITLE>
Example2 genNat
</TITLE></HEAD><BODY><H2>
Example2 genNat
</H2><HR>
<P>This is for your output
<HR>
<P>generated at:
<NATURAL NOT>
Time/Date
</NATURAL>
<NATURAL><!--
 PERFORM DOTIME
--></NATURAL>
<NATURAL SUB><!--
DEFINE SUBROUTINE DOTIME
 COMPRESS *TIME *DATE INTO #VALUE
 PERFORM W3TEXTLINE #VALUE
END-SUBROUTINE
--></NATURAL>
<NATURAL DATA><!--
1 #VALUE (A30)
--></NATURAL>
</BODY></HTML>

Generated Natural subprogram:

* ----- SUBPROGRAM generated out of file:
* ----- C:\example2.html
DEFINE DATA
PARAMETER USING W3PARM
LOCAL USING W3CONST
1 #VALUE (A30)
* ----- PRIVATE VARIABLES -----
1 W3VALUE (A250)
END-DEFINE
*
* ----- ERROR HANDLER -----
ON ERROR
  PERFORM W3ERROR ##W3ERROR
  PERFORM W3END ##RPC
  ESCAPE ROUTINE
END-ERROR
* ----- INITIALIZE HTTP API -----
PERFORM W3INIT ##RPC
* ----- HEADER FOR SERVER -----
PERFORM W3CONTENT-TYPE 'text/html'
*
* ----- MAIN PROGRAM -----
PERFORM W3TEXTLINE'<HTML><HEAD><TITLE>'
PERFORM W3TEXTLINE 'Example2 genNat'
PERFORM W3TEXTLINE'</TITLE></HEAD><BODY><H2>'
PERFORM W3TEXTLINE 'Example2 genNat'
PERFORM W3TEXTLINE '</H2><HR>'
PERFORM W3TEXTLINE '<P>This is for your output'
PERFORM W3TEXTLINE '<HR>'
PERFORM W3TEXTLINE '<P>generated at:'
 PERFORM DOTIME
PERFORM W3TEXTLINE '</BODY></HTML>'
* ----- END HTTP API -----
PERFORM W3END ##RPC
* ----- END MAIN PROGRAM -----
*
*
* ----- SUBROUTINES -----
DEFINE SUBROUTINE DOTIME
 COMPRESS *TIME *DATE INTO #VALUE
 PERFORM W3TEXTLINE #VALUE
END-SUBROUTINE
END

Note:
The syntax of the Natural program will not be checked during conversion.

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Options

14:04:47                 ***** HTML to Natural *****                2005-02-14
 User SAG                        - Options -                Library SYSWEB    
                                                                               
  HTML File                                                                    
  Delete unnecessary white space ............... _                             
  Save <natural NOT>..</natural> at source ..... _                             
                                                                               
  Generated Source                                                             
  Stow after generation ........................ _                             
  Natural line length .......................... 128                           
                                                                               
                                                                               
  Default input file:                                                          
  $NATDIR/$NATVER/SAMPLES/SYSWEB/*.HTM_______________________________________  
                                                                               
                                                                               
                                                                               
                                                                               
                                                                               
                                                                               
                                                                               
Enter-PF1---PF2---PF3---PF4---PF5---PF6---PF7---PF8---PF9---PF10--PF11--PF12---
      Help        Exit                                                  Canc 

Below is information on:

Input/Output Fields

Field Explanation
Delete unnecessary white space

If checked, multiple white-space characters such as blank, new line, tab, will be reduced to a single white space. For special HTML tags such as <PRE>, <TEXTAREA> or <SCRIPT>, the white space will not be collapsed.

Default value: unchecked

Save <NATURAL NOT> ... <NATURAL> in Source

If checked, the content of <NATURAL NOT> tags will not usually be generated into the Natural source. This option generates the content of <NATURAL NOT> as comment into the Natural source.

Default value: unchecked

Stow after Generation

If checked, the generated program will be stowed if the generation has been successful.

Default value: checked

Natural Line Length

The length of the generated Natural source lines: the minimum value is 20, the maximum 246.

Default value: 72

Default Input File

The default input file to be used for the generation.

Default value: /nat/natc/611/samples/sysexxt

Functions and Keys

Key Function Explanation
ENTER   Leaves the program and saves the changes.
PF3 Exit Returns to the command line.
PF12 Canc Leaves the program without saving your changes.

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Online Test Utility WEB-ONL

This Test Utility is a component of the Natural Web Interface. You have the ability to check your subprogram locally without involving an HTTP server. The transfer parameters for your web page are transferred into the Test Utility and are posted directly to the business logic. As communication platform, you can choose either RPC or DCOM as in real remote communications. The result is either the web page expected or an error message. The web page can be viewed with the browser or a viewer of your choice. If you receive an error message, you can easily debug your business logic locally without writing an extra test routine. No remote debugging is needed.

Features:

Below is information on:

Running the Application

Start of instruction set To run the application

  1. Start the program WEB-ONL.

  2. Select a library and subprogram name.

  3. Optional: add parameters.

  4. Choose RPC or DCOM.

  5. Press ENTER.

 09:55:24        ***** Natural Web Online Test Utility *****        2003-02-14
                                 - Main Menu -               Library SYSWEB    
                                                                               
  Library ............. SYSWEB__                                               
  Subprogram .......... NAT-ENV                                                
  DCOM/RPC ............ R                                                      
  Output text object .. WEB-OUT_                                               
                                                                               
  Parameter                                                                    
     Name                       Value                                          
  1: _________________________  _______________________________________________
  2: _________________________  _______________________________________________
  3: _________________________  _______________________________________________
  4: _________________________  _______________________________________________
  5: _________________________  _______________________________________________
  6: _________________________  _______________________________________________
  7: _________________________  _______________________________________________
  8: _________________________  _______________________________________________
  9: _________________________  _______________________________________________
                                                                               
                                                                               
Enter-PF1---PF2---PF3---PF4---PF5---PF6---PF7---PF8---PF9---PF10--PF11--PF12---
      Help        Exit                                                  Canc   

Input/Output Fields

Field Explanation
Library The library in which the required subprogram is stored.
Subprogram The name of the required subprogram.
DCOM/RPC

Can be selected with either DCOM or RPC as communication form. For DCOM, you have to register your classes first.

Default: R

Output Text
Object

The name of the Natural object of the type Text that stores the result of the generated web page.

Default: WEB-OUT

Parameter:
Name
Value

Here you can enter the name-value-pairs needed from the subprogram. If you use server parameters, place an ampersand (&) in front of the variable name before you add the parameter to the parameter list.

Functions and Keys

Key Function Explanation
ENTER   Runs the process of receiving the output of the requested subprogram. The status of the process is displayed in the message line at the bottom of the WEB-ONL program screen.
PF3 Exit Leaves the Test Utility and returns to the command line.
PF12 Canc Cancel. Stops processing.

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