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annotate src/luan/interp/ReturnStmt.java @ 31:5cf15507d77e

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separate interpreter from interface git-svn-id: https://luan-java.googlecode.com/svn/trunk@32 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Thu, 13 Dec 2012 02:50:04 +0000
parents 1e37f22a34c8
children e3624b7cd603
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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1 package luan.interp;
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3 import luan.Lua;
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4 import luan.LuaException;
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5 import luan.LuaFunction;
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8 final class ReturnStmt implements Stmt {
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9 private final Expressions expressions;
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10 private final Expr tailFnExpr;
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11 boolean throwReturnException = true;
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13 ReturnStmt(Expressions expressions) {
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14 if( expressions instanceof FnCall ) { // tail call
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15 FnCall fnCall = (FnCall)expressions;
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16 this.expressions = fnCall.args;
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17 this.tailFnExpr = fnCall.fnExpr;
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18 } else {
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19 this.expressions = expressions;
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20 this.tailFnExpr = null;
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21 }
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22 }
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24 @Override public void eval(LuaStateImpl lua) throws LuaException {
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25 lua.returnValues = expressions.eval(lua);
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26 if( tailFnExpr != null ) {
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27 LuaFunction tailFn = Lua.checkFunction( tailFnExpr.eval(lua) );
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28 if( tailFn instanceof LuaClosure ) {
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29 lua.tailFn = (LuaClosure)tailFn;
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30 } else {
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31 lua.returnValues = tailFn.call(lua,lua.returnValues);
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32 }
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33 }
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34 if( throwReturnException )
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35 throw new ReturnException();
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36 }
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37 }