1 line
3.5 KiB
Plaintext
Executable File
1 line
3.5 KiB
Plaintext
Executable File
;..............................................................................;
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;
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; EVAL - Evaluate word expression to A
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;
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; eval expression
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;
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; The first operand in an expression may or may not be present. If it is
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; present then the accumulator will be loaded with its value before expression
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; evaluation begins.
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;
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; Sample expressions:
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;
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; eval 'Var1.+Var2.-Var3.+#10'
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; eval '.*Var3./Var4.%Var5'
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;
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; Note:
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;
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; Eleven operations are supported +,-,*,/,% (mod), ^ (and), | (or), x (eor), < (asl),
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; > (lsr), i (inc), and d (dec). Each of these must be preceded by a '.' and no spaces
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; can be present in the expression. The expression should be quoted. Also note that
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; both immediate and variable word values may be operands.
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;
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;..............................................................................;
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MACRO
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&lab eval &exp
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&lab
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lclc &operand
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lcla &opstart
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lclc &newexp
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IF (&substr(&exp,1,1) = '''') or (&substr(&exp,1,1) = '"') THEN
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&newexp setc &substr(&exp,2,&len(&exp)-2)
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ELSE
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&newexp setc &exp
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ENDIF
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&operand setc &substr(&newexp,1,1)
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IF &operand='.' GOTO .no1op
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&opstart seta &pos('.',&newexp)
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IF &opstart>0 GOTO .doexp
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lda &newexp
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mexit
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.doexp
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&operand setc &substr(&newexp,1,&opstart-1)
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&newexp setc &substr(&newexp,&opstart,&len(&newexp)-&opstart+1)
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lda &operand
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.no1op
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eval2 &newexp
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mexit
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MEND
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;
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; Eval2 is the heart of the eval macro
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;
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MACRO
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&lab eval2 &exp
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&lab ;
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IF (&nbr(&syslist)=0) GOTO .done
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lclc &op
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lclc &operand
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lclc &rest
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lcla &restbegin
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lclc &newexp
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&newexp setc &exp
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.start
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&op setc &substr(&newexp,2,1)
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&rest setc &substr(&newexp,3,&len(&newexp)-2)
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&restbegin seta &pos('.',&rest)
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IF &restbegin>0 GOTO .ok
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&restbegin seta &len(&rest)+1
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.ok
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&operand setc &substr(&rest,1,&restbegin-1)
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IF &op='+' GOTO .doadd
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IF &op='-' GOTO .dosub
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IF &op='*' GOTO .domul
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IF &op='/' GOTO .dodiv
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IF &op='%' GOTO .domod
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IF &op='^' GOTO .doand
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IF &op='|' GOTO .door
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IF &op='x' GOTO .doxor
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IF &op='<' GOTO .doasl
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IF &op='>' GOTO .dolsr
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IF &op='i' GOTO .doinc
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IF &op='d' GOTO .dodec
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.done
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mexit
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.doadd
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clc
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adc &operand
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GOTO .dorest
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.dosub
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sec
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sbc &operand
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GOTO .dorest
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.domul
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pha
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pha
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pha
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lda &operand
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pha
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_Multiply
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pla
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plx
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GOTO .dorest
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.dodiv
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pha
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pha
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pha
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lda &operand
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pha
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_SDivide
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pla
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plx
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GOTO .dorest
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.domod
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pha
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pha
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pha
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lda &operand
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pha
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_SDivide
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plx
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pla
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GOTO .dorest
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.doand
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and &operand
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GOTO .dorest
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.door
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ora &operand
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GOTO .dorest
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.doxor
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eor &operand
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GOTO .dorest
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.doasl
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asl a
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GOTO .dorest
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.dolsr
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lsr a
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GOTO .dorest
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.doinc
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inc a
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GOTO .dorest
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.dodec
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dec a
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GOTO .dorest
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.dorest
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&restbegin seta &pos('.',&rest)
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IF &restbegin>0 GOTO .next
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mexit
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.next
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&newexp setc &substr(&rest,&restbegin,&len(&rest)-&restbegin+1)
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GOTO .start
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mexit
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MEND
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