43 lines
1.0 KiB
Java
43 lines
1.0 KiB
Java
package function.builtin;
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import function.ArgumentValidator;
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import function.FunctionNames;
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import function.LispFunction;
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import sexpression.Cons;
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import sexpression.SExpression;
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import sexpression.Symbol;
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import java.math.BigInteger;
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@FunctionNames({ "GENSYM" })
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public class GENSYM extends LispFunction {
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public static final String GENSYM_PREFIX = "#G";
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private static BigInteger counter = BigInteger.ZERO;
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private static Symbol generateSymbol() {
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incrementCounter();
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return new Symbol(GENSYM_PREFIX + counter);
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}
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private static void incrementCounter() {
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counter = counter.add(BigInteger.ONE);
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}
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private ArgumentValidator argumentValidator;
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public GENSYM(String name) {
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this.argumentValidator = new ArgumentValidator(name);
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this.argumentValidator.setMaximumNumberOfArguments(0);
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}
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@Override
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public SExpression call(Cons argumentList) {
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argumentValidator.validate(argumentList);
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return generateSymbol();
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}
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}
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