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annotate src/luan/interp/ForStmt.java @ 127:bcb3a09d0caf

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minor git-svn-id: https://luan-java.googlecode.com/svn/trunk@128 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Sat, 07 Jun 2014 01:47:00 +0000
parents src/luan/interp/GenericForStmt.java@2428ecfed375
children 0594c132888b
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1 package luan.interp;
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2
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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.LuanSource;
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7 import luan.LuanBit;
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10 final class ForStmt extends CodeImpl implements Stmt {
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11 private final int iVars;
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12 private final int nVars;
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13 private final Expr iterExpr;
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14 private final Stmt block;
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16 ForStmt(LuanSource.Element se,int iVars,int nVars,Expr iterExpr,Stmt block) {
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17 super(se);
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18 this.iVars = iVars;
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19 this.nVars = nVars;
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20 this.iterExpr = iterExpr;
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21 this.block = block;
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22 }
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24 @Override public void eval(LuanStateImpl luan) throws LuanException {
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25 LuanFunction iter = luan.bit(se).checkFunction( iterExpr.eval(luan) );
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26 LuanBit bit = luan.bit(iterExpr.se());
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27 String name = iterExpr.se().text();
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28 try {
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29 while(true) {
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30 Object vals = bit.call(iter,name);
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31 if( vals==null )
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32 break;
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33 if( vals instanceof Object[] ) {
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34 Object[] a = (Object[])vals;
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35 if( a.length==0 )
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36 break;
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37 for( int i=0; i<nVars; i++ ) {
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38 luan.stackSet( iVars+i, i < a.length ? a[i] : null );
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39 }
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40 } else {
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41 luan.stackSet( iVars, vals );
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42 for( int i=1; i<nVars; i++ ) {
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43 luan.stackSet( iVars+i, null );
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44 }
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45 }
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46 block.eval(luan);
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47 }
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48 } catch(BreakException e) {
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49 } finally {
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50 luan.stackClear(iVars,iVars+nVars);
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51 }
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52 }
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54 }