How to create a web scripting language
For example in my 4th the image below shows a printgreen function written in 4th in page script and also shows the result seen in the browser.
View source in the browser shows the html that was created and sent from IIS.
What is being done by the 4th script engine is
· parse the webpage source looking for <?4th and ?> tags
· extract the text between the tags and send it to the Forth language input buffer
· tell the 4th language to parse and interpret the commands now in its input buffer
· output the result
The source code for my 4th scripting language is downloadable at forthwsc.zip (http://dragonsawaken.net/leho/Zen_Soft/Download/forthwsc.zip) The current source is a Visual Studio 2013 project it should compile on older compilers. The output file after the source is compiled is named forthwsc.exe
To enable 4th in my web server IIS, I follow the steps shown in the images below (I am using version 8 here but Apache and older versions of IIS can do the same thing on windows systems.)
1.) Add a mime type for pages using 4th. I used .4hf
.4hf a mine type for the file extension of the pages using 4th script
2.) Give forthwsc.exe permission to run from IIS.
IIS is told that forthwsc.exe is allowed to run.
3.) Create a mapping between *.4hf and FORTH in IIS
Put your forth script files in a directory under wwwroot so they will be found by a url like ‘http://localhost/forthscript/showgreen.4hf’
I include a script designed to test my version of the 4th language named test4th.4hf in the forthwsc.zip file with the source code.