Translator – Simple Expressions (Release)

The three possible errors were also validated (and the diagnostic errors did not occur as they were no suppose to). Finally, one of the test expressions is a string expression A$ = "this" + "test", which is correctly translated as A$ "this" "test" + =. However, technically this is not being translated as an assignment statement. Unlike C, in BASIC the “=” operator could be either assignment or equality depending on where it is found. Assignment statements will be handled later.

I discovered that in input mode, the up and down arrows can be used to recall previously entered lines in a session. This must also be built into the gets() standard library function. I also discovered that the ibcp.exe program does not work from a DOS window (Windows XP), but does run from Windows Explorer. And of course runs fine from an MSYS command window or with the Run in Console option from VIDE – the two ways I have been running the programs. Therefore, with the binary, there is now an included shortcut that starts the program in Translator input test mode.

The ibcp_0.1.4-src.zip file has been uploaded at Sourceforge IBCP Project along with the binary for the program. I realized that the codes.txt files has not been updated for the recent code additions. Instead of creating that file again (I did it manually and it was a pain), the codes.awk awk script was created to generate this file automatically from the ibcp.h include file. Assuming that MSYS is installed, this script can be run using the command “awk −f codes.awk <ibcp.h >codes.txt”.

Now that simple expressions are being translated into RPN format, it's time to add the handling of parentheses...