45 lines
1.2 KiB
Java
45 lines
1.2 KiB
Java
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/*
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* Name: Mike Cifelli
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* Course: CIS 443 - Programming Languages
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* Assignment: Lisp Interpreter 1
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*/
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package eval;
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import parser.*;
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/**
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* A <code>LispFunction</code> is an internal representation of a built-in
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* function in the Lisp programming language.
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*/
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public abstract class LispFunction {
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/**
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* Call this Lisp function with the given list of arguments.
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*
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* @param argList
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* the list of arguments to pass to this function (MUST BE A PROPER LIST)
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* @return
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* the resulting S-expression of calling this function with the specified
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* arguments
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* @throws RuntimeException
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* Indicates that an incorrect number of arguments has been passed to this
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* function or that one of the arguments is not of the expected type.
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*/
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public abstract SExpression call(Cons argList);
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/**
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* Determine if the arguments passed to this Lisp function should be
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* evaluated. A subclass should override this method to return
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* <code>false</code> if it does not want its arguments to be evaluated
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* prior to being passed.
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*
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* @return
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* <code>true</code>
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*/
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public boolean evaluateArguments() {
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return true;
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}
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}
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