Awesome
BASIC Compiler
BASIC Compiler is an open-source BASIC compiler, written in Java.
It compiles a BASIC program into Java bytecode, which can be executed with any Java Virtual Machine 1.5 or higher.
Originally, I started this project to learn about Java bytecodes, hacking together an empty Java class file, adding bits and pieces. Soon this grew into implementing a BASIC compiler complete enough to compile and play classic BASIC games like, for example, StarTrek.
BASIC Compiler is self-contained. It uses only a minimum set of Java Virtual Machine methods and – by intention – no other frameworks as I wanted to write the compiler from scratch.
The functionality of BASIC Compiler is backed by over 1500 test programs in BASIC.
The implemented BASIC language is oriented at Microsoft BASIC.
Enjoy! — Lorenz
Table of Contents
Getting Started
Prerequisites
- You have installed Java JDK (or SDK) 5 or higher on your system.
Instructions
-
Download BASICCompiler.jar to a folder.
-
Open a command prompt in that folder and enter
java -jar BASICCompiler.jarThis runs BASIC Compiler and lists command-line options:
___ _ ___ _ ___ ___ _ _ | _ ) /_\ / __|| |/ __| / __|___ _ __ _ __(_) |___ _ _ | _ \/ _ \\__ \| | (__ | (__/ _ \ ' \| '_ \ | | -_) '_| |___/_/ \_\___/|_|\___| \___\___/_|_|_| .__/_|_|___|_| |_| Version 1.6 (22-DEC-2019) by Lorenz Wiest Usage: java BASICCompiler <BASIC source filename> <Java class filename> [<options>] Options: -formatted=<filename> | Writes a formatted BASIC source file -optimize | Applies compiler optimizationsOption
-formatted=<filename>writes a pretty-printed version of the BASIC program to<filename>. The line numbers of the BASIC program are renumbered from 1000 on in increments of 10.Option
-optimizeapplies compiler optimizations. As of now, the only implemented optimization is the folding of constant string arguments of one or morePRINTstatements. -
To compile a BASIC program, for example STARTREK.BAS in folder samples, enter
java -jar BASICCompiler.jar samples/STARTREK.BAS StarTrek -
To run the compiled BASIC program, enter
java StarTrek
Build Instructions
Prerequisites
- You have installed Java SDK 5 or higher on your system.
Instructions
-
Download this project’s ZIP file from GitHub.
-
Unzip it to a temporary folder.
-
To work with the BASIC Compiler source code in your Eclipse IDE, import the
BASICCompilerproject from the temporary folder into your Eclipse IDE as an import source General > Existing Projects into Workspace. -
To compile BASIC Compiler into a convenient JAR file (Windows only), open a command prompt in the temporary folder and enter
makejarThis produces the
BASICCompiler.jarfile, containing the compiled BASIC compiler.(Note that the environment variable
JAVA_HOMEmust point to the installation folder of your Java SDK.)
Language Specification
Find more information about the implemented BASIC language in the language specification.
Samples
Find sample BASIC programs from David Ahl’s classic BASIC Computer Games books, original (used with permission) and modified, in folder samples. Below are transcripts of runs from some compiled sample BASIC programs:
F:\BASICCompiler>java 3dplot
3D-PLOT
CREATIVE COMPUTING MORRISTOWN, NEW JERSEY
*
* * *
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* * * * * * *
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* * * * * *
* * * * * ** *
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* * * * * * ** * * *
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* * * * * * * * *
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* * * * * * *
* * * * * * *
* * * * *
* * *
*
F:\BASICCompiler>java Amazing
AMAZING PROGRAM
CREATIVE COMPUTING MORRISTOWN, NEW JERSEY
WHAT ARE YOUR WIDTH AND LENGTH?22,15
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ +--+--+--+--+--+
| | | | | | |
| +--+--+--+--+--| | | | | | +--+--+--| | | | | +--| +
| | | | | | | | | | | |
+--+--+--| | +--+--+--+--+--+--+--+--+--| | | | +--| +--| +
| | | | | | | | | |
+--+--| +--+--+--+--| +--| | | | | +--| +--+--| | | +--+
| | | | | | | | | | | |
| +--+--| +--+--| +--+--| +--| | +--+--+--| | | +--+--| +
| | | | | | | | | | | |
| | | | | | | | | +--| +--+--| +--+--+--+--| +--+--| +
| | | | | | | | | | | | | |
+--+--| | | | +--+--+--+--+--| +--+--| | +--| | | | | +
| | | | | | | | | | | |
| | | +--| | +--+--+--+--+--+--| +--+--| | +--+--| | +--+
| | | | | | | | | | |
| +--+--| +--+--| +--+--| | | +--+--| +--| | +--+--+--| +
| | | | | | | | | |
+--+--+--+--| | | | +--+--| +--+--| +--+--+--+--| | +--| +
| | | | | | | | | | |
| | | | | +--| +--+--| +--+--+--+--| | | +--+--+--| | +
| | | | | | | | | | | |
+--+--+--+--+--| +--| | | | +--+--| | +--+--+--+--+--| | +
| | | | | | | | | | | |
+--+--| +--| +--| +--+--| | | | | +--| | +--+--+--+--+--+
| | | | | | | | | | | | |
+--| | +--+--| | | +--+--+--+--| +--| | +--| | | | | +
| | | | | | | | | | | | |
| +--+--+--+--+--+--+--| +--+--| | | | | +--+--| | +--| +
| | | | | | | |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--| +--+--+--+
F:\BASICCompiler>java Camel
CAMEL
CREATIVE COMPUTING
MORRISTOWN, NEW JERSEY
WOULD YOU LIKE INSTRUCTIONS?Y
WELCOME TO CAMEL. THE OBJECT IS TO TRAVEL
200 MILES ACROSS THE GREAT GOBI DESERT.
A TRIBE OF KNOCKED-KNEED PYGMIES WILL BE CHASING YOU.
YOU WILL BE ASKED FOR COMMANDS EVERY SO OFTEN.
C O M M A N D S :
#1 DRINK FROM YOUR CANTEEN
#2 AHEAD MODERATE SPEED
#3 AHEAD FULL SPEED
#4 STOP FOR THE NIGHT
#5 STATUS CHECK
#6 HOPE FOR HELP
YOU HAVE ONE QUART OF WATER WHICH WILL LAST YOU SIX DRINKS.
YOU MAY RENEW YOUR WATER SUPPLY COMPLETELY AT AN OASIS.
YOU GET A HALF A QUART IF FOUND BY HELP.
IF HELP DOES NOT FIND YOU AFTER COMMAND SIX, YOU LOSE.
GOOD LUCK AND GOOD CAMELING!
YOU ARE IN THE MIDDLE OF THE DESERT AT AN OASIS.
YOU HAVE TRAVELLED 0 MILES ALLTOGETHER.
WHAT IS YOUR COMMAND?3
YOUR CAMEL IS BURNING ACROSS THE DESERT SANDS.
YOU HAVE TRAVELLED 18 MILES ALLTOGETHER.
WHAT IS YOUR COMMAND?3
YOUR CAMEL IS BURNING ACROSS THE DESERT SANDS.
----------W A R N I N G---------- GET A DRINK
YOU HAVE TRAVELLED 18 MILES ALLTOGETHER.
WHAT IS YOUR COMMAND?4
YOUR CAMEL THANKS YOU!
THE PYGMIES ARE 6 MILES BEHIND YOU.
YOU HAVE TRAVELLED 18 MILES ALLTOGETHER.
WHAT IS YOUR COMMAND?1
BETTER WATCH FOR AN OASIS!
WHAT IS YOUR COMMAND?3
YOUR CAMEL IS BURNING ACROSS THE DESERT SANDS.
THE PYGMIES HAVE CAPTURED YOU. CAMEL AND PEOPLE SOUP IS
THEIR FAVORITE DISH!!!
WANT A NEW CAMEL AND A NEW GAME?
-----------------
CHICKEN
-----------------
F:\BASICCompiler>java Chase
CHASE
CREATIVE COMPUTING
MORISTOWN, NEW JERSEY
YOU ARE WITHIN THE WALLS OF A HIGH VOLTAGE MAZE.
THERE ARE FIVE SECURITY MACHINES TRYING TO DESTROY YOU.
YOU ARE THE '*', THE INTERCEPTORS ARE THE '+'.
THE AREAS MARKED 'X' ARE HIGH VOLTAGE.
YOUR ONLY CHANCE FOR SURVIVAL IS TO MANEUVER EACH
INTERCEPTOR INTO AN 'X'. GOOD LUCK!
MOVES ARE 7.8.9
4.*.6
1.2.3
10 = NO MOVE FOR THE REST OF THE GAME
-1 = GAVE UP, SITUATION HOPELESS
0 = A TREMENDOUS (BUT UNFORTUNATELY RANDOM) LEAP
XXXXXXXXXXXXXXXXXXXX
X + XX
X X+ + X
X X + X
X * XX X
X XXX
X X X+ XX
X X X X
X X X X
XXXXXXXXXXXXXXXXXXXX
?6
XXXXXXXXXXXXXXXXXXXX
X XX
X + X X
X X + + X
X * XX + X
X + XXX
X X X XX
X X X X
X X X X
XXXXXXXXXXXXXXXXXXXX
?6
XXXXXXXXXXXXXXXXXXXX
X XX
X X X
X +X X
X * +XX+ + X
X XXX
X X X XX
X X X X
X X X X
XXXXXXXXXXXXXXXXXXXX
?2
XXXXXXXXXXXXXXXXXXXX
X XX
X X X
X X X
X + XX X
X * + + + XXX
X X X XX
X X X X
X X X X
XXXXXXXXXXXXXXXXXXXX
?0
$6,000,000 JUMP!!!
XXXXXXXXXXXXXXXXXXXX
X XX
X X X
X *+X X
X + XX+ X
X XXX
X X X XX
X X X X
X X X X
XXXXXXXXXXXXXXXXXXXX
?8
*** YOU HAVE BEEN DESTROYED BY A LUCKY COMPUTER ***
ANOTHER GAME (Y/N)?
F:\BASICCompiler>java Eliza
ELIZA
CREATIVE COMPUTING
MORRISTOWN, NEW JERSEY
HI! I'M ELIZA. WHAT'S YOUR PROBLEM?
?THE OTHER DAY I HAD A DREAM ABOUT COMPUTERS
WHAT DOES THAT DREAM SUGGEST TO YOU?
?I AM CODING TOO MUCH
DID YOU COME TO ME BECAUSE YOU ARE CODING TOO MUCH
?PERHAPS
SAY, DO YOU HAVE ANY PSYCHOLOGICAL PROBLEMS?
?I AM WONDERING ABOUT MY DREAMS
HOW LONG HAVE YOU BEEN WONDERING ABOUT YOUR DREAMS
?FOR SOME WEEKS
WHAT DOES THAT SUGGEST TO YOU?
?IT IS SOMETHING THAT MAKES ME PONDER
I SEE.
?
F:\BASICCompiler>java Inkblot
INKBLOT
CREATIVE CMOPUTING
MORRISTOWN, NEW JERSEY
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F:\BASICCompiler>java Lunar
LUNAR
CREATIVE COMPUTING MORRISTOWN, NEW JERSEY
THIS IS A COMPUTER SIMULATION OF AN APOLLO LUNAR
LANDING CAPSULE.
THE ON-BOARD COMPUTER HAS FAILED (IT WAS MADE BY
XEROX) SO YOU HAVE TO LAND THE CAPSULE MANUALLY.
SET BURN RATE OF RETRO ROCKETS TO ANY VALUE BETWEEN
0 (FREE FALL) AND 200 (MAXIMUM BURN) POUNDS PER SECOND.
SET NEW BURN RATE EVERY 10 SECONDS.
CAPSULE WEIGHT 32,500 LBS; FUEL WEIGHT 16,500 LBS.
GOOD LUCK
SEC MI + FT MPH LB FUEL BURN RATE
0 120 0 3600 16500 ?0
10 109 5015 3636 16500 ?0
20 99 4223 3672 16500 ?0
30 89 2903 3708 16500 ?0
40 79 1055 3743.999 16500 ?0
50 68 3959 3779.999 16500 ?0
60 58 1055 3815.999 16500 ?0
70 47 2903 3851.999 16500 ?200
80 37 1883 3482.868 14500 ?200
90 28 1191 3086.708 12500 ?200
100 20 1251 2659.654 10500 ?200
110 13 2549 2196.946 8500 ?200
120 8 370 1692.634 6500 ?200
130 4 658 1139.137 4500 ?200
140 1 4204 526.5975 2500 ?200
150 1 1404 -158.1441 500 ?200
FUEL OUT AT 152.5 SECONDS
ON MOON AT 356.9128 SECONDS - IMPACT VELOCITY 393.2947 MPH
SORRY THERE NERE NO SURVIVORS. YOU BLOW IT!
IN FACT, YOU BLASTED A NEW LUNAR CRATER 89.27791 FEET DEEP!
TRY AGAIN??
SET BURN RATE OF RETRO ROCKETS TO ANY VALUE BETWEEN
0 (FREE FALL) AND 200 (MAXIMUM BURN) POUNDS PER SECOND.
SET NEW BURN RATE EVERY 10 SECONDS.
CAPSULE WEIGHT 32,500 LBS; FUEL WEIGHT 16,500 LBS.
GOOD LUCK
SEC MI + FT MPH LB FUEL BURN RATE
0 120 0 3600 16500 ?
F:\BASICCompiler>java StarTrek
,------*------,
,------------- '--- ------'
'-------- --' / /
,---' '-------/ /--,
'----------------'
The USS ENTERPRISE --- NCC-1701
Your orders are as follows:
Destroy the 17 Klingon warships which have invaded the Galaxy before
they can attack Federation Headquarters on Stardate 2432.
This gives you 32 days.
There is 1 Starbase in the Galaxy for resupplying your ship.
Hit RETURN when ready to accept command.
Your mission begins with your Starship located in the Galactic quadrant
SPICA III.
---------------------------------
Stardate 2400
Condition Green
Quadrant 7 , 8
<*> Sector 2 , 4
* Photon Torpedoes 10
Total Energy 3000
Shields 0
Klingons Remaining 17
---------------------------------
Command ?HLP
You are the Captain of the Starship ENTERPRISE. Navigate the universe and
destroy all Klingon cruisers. Dock at a Starbase to refuel and repair the
ENTERPRISE.
The universe consists of 8 x 8 quadrants, each quadrant of 8 x 8 sectors.
Available commands are:
NAV Set the course of the ENTERPRISE. Directions are given as
4 3 2
\|/
5-+-1
/|\
6 7 8
SRS Display a short-range-sensor scan, a map of the sector you are in.
It displays the following objects:
<*> - ENTERPRISE
+K+ - Klingon cruiser
>!< - Starbase
* - Star
LRS Display a long-range-sensor scan, a map of the surrounding
quadrants. They are encoded as ABC with
A - Number of Klingon cruisers
B - Number of Starbases
C - Number of Stars
PHA Fire phasers
TOR Fire photon torpedoes
SHE Raise or lower shields
DAM Display Damage-Control Report
COM Call on Library-Computer. Available computer commands are:
0 - Cumulative Galactic Record
1 - Status Report
2 - Photon Torpedo Data
3 - Starbase Nav Data
4 - Direction/Distance Calculator
5 - Galaxy 'Region Name' Map
XXX Resign your command
HLP Display help
Command ?
F:\BASICCompiler>java Wumpus
WUMPUS
CREATIVE COMPUTING MORRISTOWN, NEW JERSEY
INSTRUCTIONS (Y-N)?Y
WELCOME TO 'HUNT THE WUMPUS'
THE WUMPUS LIVES IN A CAVE OF 20 ROOMS. EACH ROOM
HAS 3 TUNNELS LEADING TO OTHER ROOMS. (LOOK AT A
DODECAHEDRON TO SEE HOW THIS WORKS - IF YOU DON'T KNOW
WHAT A DODECAHEDRON IS, ASK SOMEONE)
HAZARDS:
BOTTOMLESS PITS - TWO ROOMS HAVE BOTTOMLESS PITS IN THEM
IF YOU GO THERE, YOU FALL INTO THE PIT (& LOSE!)
SUPERBATS - TWO OTHER ROOMS HAVE SUPER BATS. IF YOU
GO THERE, A BAT GRABS YOU AND TAKES YOU TO SOME OTHER
ROOM AT RANDOM (WHICH MIGHT BE TROUBLESOME).
WUMPUS:
THE WUMPUS IS NOT BOTHERED BY THE HAZARDS (HE HAS SUCKER
FEET AND IS TOO BIG FOR A BAT TO LIFT). USUALLY
HE IS ASLEEP. TWO THINGS THAT WAKE HIM UP: YOUR ENTERING
HIS ROOM OR YOUR SHOOTING AN ARROW.
IF THE WUMPUS WAKES, HE MOVES (P=.75) ONE ROOM
OR STAYS STILL (P=.25). AFTER THAT, IF HE IS WHERE YOU
ARE, HE EATS YOU UP (& YOU LOSE!)
YOU:
EACH TURN YOU MAY MOVE OR SHOOT A CROOKED ARROW:
MOVING - YOU CAN GO ONE ROOM (THRU ONE TUNNEL).
ARROWS - YOU HAVE 5 ARROWS. YOU LOSE WHEN YOU RUN OUT.
EACH ARROW CAN GO FROM 1 TO 5 ROOMS. YOU AIM BY TELLING
THE COMPUTER THE ROOMS YOU WANT THE ARROW TO GO TO.
IF THE ARROW CAN'T GO THAT WAY (IE NO TUNNEL) IT MOVES
AT RANDOM TO THE NEXT ROOM.
IF THE ARROW HITS THE WUMPUS, YOU WIN.
IF THE ARROW HITS YOU, YOU LOSE.
WARNINGS:
WHEN YOU ARE ONE ROOM AWAY FROM WUMPUS OR HAZARD,
THE COMPUTER SAYS:
WUMPUS - 'I SMELL A WUMPUS'
BAT - 'BATS NEARBY'
PIT - 'I FEEL A DRAFT'
HUNT THE WUMPUS
YOU ARE in ROOM 7
TUNNELS LEAD TO 6 8 17
SHOOT TO MOVE (S-M)?M
WHERE TO?6
YOU ARE in ROOM 6
TUNNELS LEAD TO 5 7 15
SHOOT TO MOVE (S-M)?M
WHERE TO?5
I FEEL A DRAFT!
YOU ARE in ROOM 5
TUNNELS LEAD TO 1 4 6
SHOOT TO MOVE (S-M)?S
NO. OF ROOMS (1-5)?1
ROOM NO.?1
MISSED
I FEEL A DRAFT!
YOU ARE in ROOM 5
TUNNELS LEAD TO 1 4 6
SHOOT TO MOVE (S-M)?M
WHERE TO?4
YYYIIIIEEEE ... FELL IN PIT!
HA HA HA - YOU LOSE!
SAME SET-UP (Y-N)?
License
This project is available under the MIT license.