home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
The Datafile PD-CD 5
/
DATAFILE_PDCD5.iso
/
utilities
/
c
/
compbasic
/
!CompBasic
/
!Help
next >
Wrap
Text File
|
1992-11-15
|
3KB
|
54 lines
!CompBasic
==========
!CompBasic is a program that allows you to compress basic programs while
still allowing the program to run correctly. It does this by using the
techniques outlined below. This has the advantage that the programs take
less space on disk, are (slightly) faster to load and take up less memory
once loaded. They should also run slightly faster because there is less
program to scan through for PROC calls etc..
To use the program you must double click on the icon to load it and then
drag a BASIC program onto the icon or onto the main window. The window shows
the name of the program, number of lines in the program and also all the
compression options. Selecting menu opens a savebox, which allows you to
begin the compression. The name you save it under must be different to the
original prgram.
The iconbar menu allows you to set wether or not the compression is
multitasking (if it is, the compression will take longer but you will be
able to do other things while compressing). The abort option is only
selectable while compressing and will abort the operation (obviously). The
save opts option saves all of the options to disk so that when the program
is run again it will use the same compression.
Techniques Used
===============
Space compression - This option cannot be removed and will remove most
spaces from any program. The exceptions are those within
speech marks and some spaces which would make the
program uneditable or make the program error if run.
Extra space - This removes spaces that are only needed for editors
(i.e. spaces around tokenised instructions.)
Remove blank lines - Any lines which are only a ":" or nothing are removed.
Remove REMs - Removes any REM statements
Remove THENs - Removes any excess THENs
Replace ASCs - This turns ASC expressions into numbers
Change SWIs - This changes SWI names to numbers
Compress DEFs - Turns all PROC and FN names in 2 letters. This means
that you can have over 600 PROCs and over 600 FNs in
the program.
Join lines - Joins lines together
Join DATA - Joins DATA expressions
Renumber - Doesn't change the length but just renumbers in
increments of 10
Further additions may include sum compression (which will evaluate sums
making the program shorter and faster) and variable name compression. If you
have any other ideas of feature to add please write to me.
James Miskin
23 Hardwick Drive
Loughborough
LE11 OTJ