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annotate core/src/luan/impl/ForStmt.java @ 647:8e8c30b72e9b

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move methods from LuanState to Luan
author Franklin Schmidt <fschmidt@gmail.com>
date Tue, 29 Mar 2016 20:39:14 -0600
parents 859c0dedc8b6
children
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4eaee12f6c65 move luan/interp to impl
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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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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8 final class ForStmt extends CodeImpl implements Stmt {
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9 private final int iVars;
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10 private final int nVars;
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11 private final Expr iterExpr;
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12 private final Stmt block;
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14 ForStmt(int iVars,int nVars,Expr iterExpr,Stmt block) {
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15 this.iVars = iVars;
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16 this.nVars = nVars;
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17 this.iterExpr = iterExpr;
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18 this.block = block;
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19 }
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21 @Override public void eval(LuanStateImpl luan) throws LuanException {
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22 Object fnObj = iterExpr.eval(luan);
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23 try {
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24 LuanFunction iter = Luan.checkFunction(fnObj);
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25 while(true) {
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26 Object vals = iter.call(luan);
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27 if( vals==null )
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28 break;
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29 if( vals instanceof Object[] ) {
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30 Object[] a = (Object[])vals;
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31 if( a.length==0 || a[0]==null )
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32 break;
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33 for( int i=0; i<nVars; i++ ) {
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34 luan.stackSet( iVars+i, i < a.length ? a[i] : null );
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35 }
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36 } else {
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37 luan.stackSet( iVars, vals );
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38 for( int i=1; i<nVars; i++ ) {
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39 luan.stackSet( iVars+i, null );
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40 }
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41 }
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42 block.eval(luan);
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43 }
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44 } catch(BreakException e) {
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45 } finally {
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46 luan.stackClear(iVars,iVars+nVars);
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47 }
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48 }
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50 }