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3: Implementing Language Interpreters in Java
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The GOSUB statement works like this. When a GOSUB is encountered, the target line number is looked up and stored in loc. Next, the current value of progIdx is pushed onto the GOSUB stack. (This is the point in the program that the subroutine will return to once it is finished.) Finally, the index stored in loc is assigned to progIdx. This causes program execution to jump to the start of the subroutine. When a RETURN is encountered, the GOSUB stack is popped and this value is assigned to progIDx, causing execution to continue on to the next line after the GOSUB statement. Because return addresses are stored on the GOSUB stack, subroutines may be nested. The most recently called subroutine will be the one returned from when its RETURN statement is encountered. (That is, the return address of the most recently called subroutine will be on the top of the gstack stack.) This process allows GOSUBs to be nested to any depth.
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The END Statement
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The END keyword signifies the end of program execution. It is not always needed because the physical end of the program also causes program execution to stop. END is simply used to end the program before the end of the file has been reached. Its only action is to cause the sbInterp( ) method to return, thus ending execution.
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Using Small BASIC
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To use SBasic, first create an SBasic object, specifying the name of the file that you want to interpret. Then call run( ). You must remember to catch any InterpreterExceptions that might be thrown. The following program lets you run any Small BASIC program you want by specifying its name on the command line:
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// Demonstrate the Small BASIC Interpreter. class SBDemo { public static void main(String args[]) { if(args.length != 1) { System.out.println("Usage: sbasic <filename>"); return; } try { SBasic ob = new SBasic(args[0]); ob.run(); } catch(InterpreterException exc) { System.out.println(exc); } } }
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Compile SBDemo like this:
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javac SBasic.java SBDemo.java
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Execute SBDemo with the name of a Small BASIC program as the first command-line parameter. For example, to interpret a program called TEST.BAS, use this command line:
java SBDemo TEST.BAS
Here is a short Small BASIC program you can try:
PRINT "This program converts gallons to liters." 100 GOSUB 200 INPUT "Again (1 or 0): ", x IF x = 1 THEN GOTO 100 END 200 INPUT "Enter gallons: ", g l = g * 3.7854 PRINT g; "gallons is"; l; "liters." RETURN
Here is sample output produced when this program is run:
This program converts gallons to liters. Enter gallons: 10 10.0 gallons is 37.854 liters. Again (1 or 0): 1 Enter gallons: 4 4.0 gallons is 15.1416 liters. Again (1 or 0): 0
More Small BASIC Sample Programs
Here is a sampling of programs that Small BASIC will execute. Notice that both upper- and lowercase are supported. That is, Small BASIC is not case sensitive. Thus, keywords and variables can be entered in either case. In addition to the programs shown here, you will want to write several of your own. Also, try writing programs that have syntax errors and observe the way Small BASIC reports them. The following program exercises all of the features supported by Small BASIC:
PRINT FOR X PRINT NEXT GOSUB PRINT "This program demonstrates all features." = 1 TO 100 X; X/2, X; X*X 300 "hello"
3: Implementing Language Interpreters in Java
INPUT H IF H<11 THEN GOTO 200 PRINT 12-4/2 PRINT 100 200 A = 100/2 IF A>10 THEN PRINT "this is ok" PRINT A PRINT A+34 INPUT H PRINT H INPUT "this is a test ", y PRINT H+Y END 300 PRINT "this is a subroutine" RETURN
The next program demonstrates nested subroutines:
PRINT "This program demonstrates nested GOSUBs." INPUT "enter a number: ", I GOSUB 100 END 100 FOR T = 1 TO I X = X + I GOSUB 150 NEXT RETURN 150 PRINT X; RETURN
The following program illustrates the INPUT statement:
PRINT INPUT INPUT INPUT t = l PRINT "This program "Enter length "Enter length "Enter length * w * d "Volume is ", computes the volume of a cube." of first side ", l of second side ", w of third side ", d t
The next program illustrates nested FOR loops:
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