Mercurial Hosting > luan
annotate core/src/luan/impl/ForStmt.java @ 237:97d175772fed
implement mmake
git-svn-id: https://luan-java.googlecode.com/svn/trunk@238 21e917c8-12df-6dd8-5cb6-c86387c605b9
author | fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9> |
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date | Mon, 06 Oct 2014 04:07:56 +0000 |
parents | 3dcb0f9bee82 |
children | b48cfa14ba60 |
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1 package luan.impl; |
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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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8 |
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9 |
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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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15 |
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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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23 |
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24 @Override public void eval(LuanStateImpl luan) throws LuanException { |
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25 LuanBit bit = luan.bit(iterExpr.se()); |
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26 LuanFunction iter = bit.checkFunction( iterExpr.eval(luan) ); |
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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,LuanFunction.NOTHING); |
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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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53 |
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54 } |