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package bjc.dicelang.expr;
/**
* Represents the type of this token.
*
* @author Ben Culkin
*/
public enum TokenType {
/*
* @NOTE
*
* Do we want to switch to auto-numbering the tokens? They were manually
* numbered because this was an assignment for PoPL and that was what
* Dr. Naz wanted.
*/
/** Represents + */
ADD(14, true, 0),
/** Represents - */
SUBTRACT(15, true, 0),
/** Represents * */
MULTIPLY(16, true, 1),
/** Represents / */
DIVIDE(17, true, 1),
/** Represents variable names. */
VREF(11),
/** Represents ( */
OPAREN(0, false, 100),
/** Represents ) */
CPAREN(0, false, 100);
/** The ID number for this token type. */
public final int nVal;
/** Whether or not this type of token is an operator. */
public final boolean isOperator;
/** The priority of this operator, if it is one. */
public final int operatorPriority;
/* Create a new token. */
private TokenType(final int num, final boolean isOp, final int priority) {
nVal = num;
isOperator = isOp;
operatorPriority = priority;
}
private TokenType(final int num) {
this(num, false, -1);
}
@Override
public String toString() {
return Integer.toString(nVal);
}
}
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