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Refactored the built in function quote

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This commit is contained in:
Mike Cifelli 2017-01-15 19:17:19 -05:00
parent 38db0862ff
commit 35ef281733
1 changed files with 11 additions and 29 deletions
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36
src/function/builtin/special/QUOTE.java
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@ -1,41 +1,23 @@
package function.builtin.special; package function.builtin.special;
import function.LispFunction; import function.*;
import function.builtin.cons.LENGTH;
import sexpression.*; import sexpression.*;
/**
* <code>QUOTE</code> represents the QUOTE form in Lisp.
*/
public class QUOTE extends LispFunction { public class QUOTE extends LispFunction {
// The number of arguments that QUOTE takes. private ArgumentValidator argumentValidator;
private static final int NUM_ARGS = 1;
public SExpression call(Cons argList) { public QUOTE() {
// retrieve the number of arguments passed to QUOTE this.argumentValidator = new ArgumentValidator("QUOTE");
int argListLength = LENGTH.getLength(argList); this.argumentValidator.setExactNumberOfArguments(1);
// make sure we have received exactly one argument
if (argListLength != NUM_ARGS) {
Cons originalSExpr = new Cons(new Symbol("QUOTE"), argList);
String errMsg = "too " +
((argListLength > NUM_ARGS) ? "many" : "few") +
" arguments given to QUOTE: " + originalSExpr;
throw new RuntimeException(errMsg);
} }
return argList.getCar(); public SExpression call(Cons argumentList) {
argumentValidator.validate(argumentList);
return argumentList.getCar();
} }
/**
* Determine if the arguments passed to this Lisp function should be
* evaluated.
*
* @return
* <code>false</code>
*/
public boolean evaluateArguments() { public boolean evaluateArguments() {
return false; return false;
} }