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package bjc.dicelang.expr;
/*
* @TODO 10/08/17 :TokenReorg
* I am not a fan of this 'having a bunch of subclasses' in one thing I
* seem to have been doing around this project. This should be multiple
* subclasses, one for each value for TokenType.
*/
/**
* Represents a lexical token.
*
* @author Ben Culkin
*/
public class Token {
/* The state for this token. */
private final Tokens tks;
/**
* The type of the token.
*
* Determines which fields have a value.
*/
public final TokenType typ;
/** The integer value attached to this token. */
public int intValue;
/** The original string this token was part of. */
public String rawValue;
/**
* Create a new token.
*
* @param type
* The type of this token.
*
* @param raw
* The string this token came from.
*
* @param toks
* The state for this token
*/
public Token(final TokenType type, final String raw, final Tokens toks) {
this.typ = type;
rawValue = raw;
tks = toks;
}
@Override
public String toString() {
String typeStr = typ.toString();
typeStr = String.format("%s (%s)", typeStr, typ.name());
if (typ == TokenType.VREF) {
typeStr += " (ind. " + intValue;
typeStr += ", sym. \"" + tks.symbolTable.get(intValue) + "\")";
}
return String.format("%s (originally from: %s)", typeStr, rawValue);
}
/**
* Convert this token into the string representation of it.
*
* @return The string representation of it.
*/
public String toExpr() {
switch (typ) {
case ADD:
return "+";
case SUBTRACT:
return "-";
case MULTIPLY:
return "*";
case DIVIDE:
return "/";
case VREF:
return tks.symbolTable.get(intValue);
case OPAREN:
return "(";
case CPAREN:
return ")";
default:
return "???";
}
}
}
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