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annotate core/src/luan/impl/ReturnStmt.java @ 576:4723d22062ce

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remove LuanBit
author Franklin Schmidt <fschmidt@gmail.com>
date Mon, 13 Jul 2015 20:38:26 -0600
parents b48cfa14ba60
children abc3198c86dd
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1 package luan.impl;
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3 import luan.Luan;
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4 import luan.LuanException;
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5 import luan.LuanFunction;
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6 import luan.LuanElement;
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9 final class ReturnStmt extends CodeImpl implements Stmt {
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10 private final Expressions expressions;
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11 private final Expr tailFnExpr;
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12 boolean throwReturnException = true;
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14 ReturnStmt(LuanElement el,Expressions expressions) {
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15 super(el);
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16 if( expressions instanceof FnCall ) { // tail call
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17 FnCall fnCall = (FnCall)expressions;
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18 this.expressions = fnCall.args;
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19 this.tailFnExpr = fnCall.fnExpr;
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20 } else {
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21 this.expressions = expressions;
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22 this.tailFnExpr = null;
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23 }
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24 }
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26 @Override public void eval(LuanStateImpl luan) throws LuanException {
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27 luan.returnValues = expressions.eval(luan);
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28 if( tailFnExpr != null ) {
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29 LuanElement elTail = tailFnExpr.el();
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30 luan.push(elTail,elTail.text());
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31 try {
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32 LuanFunction tailFn = luan.checkFunction( tailFnExpr.eval(luan) );
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33 if( tailFn instanceof Closure ) {
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34 luan.tailFn = (Closure)tailFn;
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35 } else {
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36 luan.returnValues = tailFn.call(luan,Luan.array(luan.returnValues));
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37 }
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38 } finally {
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39 luan.pop();
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40 }
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41 }
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42 if( throwReturnException )
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43 throw new ReturnException();
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44 }
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45 }