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annotate src/luan/interp/GenericForStmt.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 d85510d92eee
children c3eab5a3ce3c
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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 GenericForStmt 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 GenericForStmt(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(LuaStateImpl lua) throws LuaException {
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22 LuaFunction iter = Lua.checkFunction( iterExpr.eval(lua) );
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23 Object[] stack = lua.stack();
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24 try {
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25 while(true) {
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26 Object[] vals = iter.call(lua);
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27 if( vals.length==0 || vals[0]==null )
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28 break;
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29 for( int i=0; i<nVars; i++ ) {
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30 stack[iVars+i] = i < vals.length ? vals[i] : null;
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31 }
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32 block.eval(lua);
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33 }
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34 } catch(BreakException e) {
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35 } finally {
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36 for( int i=iVars; i<iVars+nVars; i++ ) {
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37 stack[i] = null;
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38 }
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39 }
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40 }
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42 }