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Let's Build a Scripting Engine-Compiler - Blunt Axe Basic Project
"Bxbasic is presented as a programming tutorial, to develop and construct a Console Mode Scripting Engine and
Byte Code Compiler. The Bxbasic dialect, included here, is a subset of the GW-Basic and QBasic programming
languages.
Well, this whole thing started a few years back, when a number of programmers and I, that frequented the Rapid-Q
developer’s group site, decided that we just didn't like what was going on out there in the realm of Rapid-Q and
Basic programming in general. So, we set out to form our own programmer’s group, that being the QDepartment
group."
Real-time TrafficCompiler |
| Added | 21 Apr 2009 |
| Updated | 01 Oct 2010 |
| Authors | S. Arbayo |
Welcome to Bxbasic
What is Bxbasic ?.
How did Bxbasic get started ?
CHAPTER - 1
INTRODUCTION
The HACK
Native Code Compiler:
Scripting Engine-Compiler:
BXBASIC
GETTING STARTED
THE MAIN PROGRAM
ERROR HANDLER.
LOADING THE PROGRAM - 1
LOADING THE PROGRAM - 2
PROGRAM PARSER
TOKEN PARSER
EXPAND VOCABULARY.
PROGRAM BRANCHING.
CONCLUSION
CHAPTER - 2
INTRODUCTION
MODIFYING BXBASIC.
VARIABLES
ASSIGNMENTS.
PRINTING VARIABLES
ERASE VARIABLES.
VARIABLES AT WORK.
VARIABLES PART II.
MODULES
CONCLUSION
CHAPTER - 3
INTRODUCTION
COMPILERS
THE BYTE-CODE
THE MERGE.
THE COMPILER
BXCOMP.EXE
THE ENGINE
TEST FIRE
BACK TO BXBASICS
EXPRESSION PARSER.
PRECEDENCE
FLOW CHART
RECURSION.
VARIABLES REVISITED.
CONCLUSION
CHAPTER - 4
INTRODUCTION
NEW LOOK-N-FEEL.
SOURCE INPUT
OTHER CHANGES.
COMPILER
THE ENGINE
FLOATING POINT
CONCLUSION
CHAPTER - 5
INTRODUCTION
ENGINE UPDATE
LONG INTEGER
SINGLE PRECISION
OPTIMIZATION
PRINTING NUMBERS
ENGINE-COMPILER.
CONCLUSION
CHAPTER - 6
INTRODUCTION
CHARACTER STRINGS
STRING VARIABLES
PRINT STRING VARIABLES
OPTIMIZING
PRINT STATEMENTS
CLEARING VARIABLES
ENGINE UPDATE
CONCLUSION
CHAPTER - 7
INTRODUCTION
GOSUB-RETURN
FOR-NEXT
LOOPS.C :
DO FOR( ) :
GET FROM( ) :
GET TO( ) :.
GET STEP( ) :.
GET AVALUE( ) :
POWER & MODULUS
COMPILER UPDATE.
ENGINE UPDATE
CONCLUSION
CHAPTER - 8
INTRODUCTION
IF-THEN-ELSE:
MULTIPLE STATEMENTS:
ELSEIF:.
ENDIF:
EXPRESSIONS:
RECURSION:
IF PARSER:
ENGINE:.
CONCLUSION
CHAPTER - 9
INTRODUCTION
STRING ASSIGNMENTS:
STRING FUNCTIONS:
TOKENS:.
STRINGS:
CONCATENATION:
CODING IT:
ENGINE UPDATE:
CONCLUSION
CHAPTER - 10
INTRODUCTION
INKEY$:
INPUT:
PRINTING FUNCTIONS:.
PRINT EXPRESSIONS:
INPUT$:.
LINE INPUT:.
MATH FUNCTIONS:.
PRINT MATH FUNCTIONS:
CONCLUSION
CHAPTER - 11
INTRODUCTION
ENGINE UPDATE:
DISK FILE I/O:
FILE OPEN CODE:
READING FILE DATA:
SEQUENTIAL INPUT CODE:
ENGINE UPDATE II:
END OF FILE:
FILE OUTPUT:
LINE INPUT:.
PRINT TO FILE:
ENGINE UPDATE III:
CONCLUSION
CHAPTER – 11
INTRODUCTION
Prototyp.h:
Utility.c:
Fileio.c:
Getinput.c:
Ifendif.c:
Input.c:
Variable.c:
String.c:
Loops.c:
Bxcomp.c:
CHAPTER - 12
INTRODUCTION
THE ASSEMBLER:
BXBASM:.
ASSEMBLY ROUTINES:
PROCEDURES:.
UTILITIES:
RE-ORGANIZE:
BEEP:.
.COM":
PRINT:
REVIEW:
MULTIPLE STRINGS:
CONCLUSION
CHAPTER - 13
INTRODUCTION
GOTO-GOSUB-RETURN:
LOCATE:
VARIABLE ASSIGNMENTS:
UTILS-INPUT:
DYNAMIC STRINGS:
D86:
CONCLUSION
CHAPTER - 14
INTRODUCTION
NULL, VAR-to-VAR:.
CONCATENATE:
INTEGERS:
CONCLUSION
CHAPTER - 15
INTRODUCTION
COMPILING EXPRESSIONS:
RECURSIVE DESCENT PARSER:.
NEGATIVE INTEGERS:
FLOATING POINT NUMBERS:.
THE x87 FPU:
THE PARSER:.
CODING THE x87:
THE CODE:
CONCLUSION
CHAPTER - 16
INTRODUCTION
DISPLAYING NUMBERS:.
WHAT IS A FLOATING POINT NUMBER?:
23 BIT MANTISSA:
FRACTIONAL MANTISSA:
DISPLAYING REAL NUMBERS:
WHAT'S YOUR SIGN?.
INTEGERS & FRACTIONS:
CONVERSION ROUTINES:
CONCLUSION
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