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annotate src/luan/interp/NumericForStmt.java @ 32:c3eab5a3ce3c

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implement closures git-svn-id: https://luan-java.googlecode.com/svn/trunk@33 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Fri, 14 Dec 2012 05:40:35 +0000
parents 5cf15507d77e
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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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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3 import luan.Lua;
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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4 import luan.LuaNumber;
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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5 import luan.LuaException;
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8 final class NumericForStmt implements Stmt {
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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9 private final int iVar;
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10 private final Expr fromExpr;
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11 private final Expr toExpr;
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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12 private final Expr stepExpr;
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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13 private final Stmt block;
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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15 NumericForStmt(int iVar,Expr fromExpr,Expr toExpr,Expr stepExpr,Stmt block) {
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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16 this.iVar = iVar;
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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17 this.fromExpr = fromExpr;
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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18 this.toExpr = toExpr;
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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19 this.stepExpr = stepExpr;
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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20 this.block = block;
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21 }
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5cf15507d77e separate interpreter from interface
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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23 @Override public void eval(LuaStateImpl lua) throws LuaException {
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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24 double v = Lua.checkNumber( fromExpr.eval(lua) ).value();
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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25 double limit = Lua.checkNumber( toExpr.eval(lua) ).value();
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26 double step = Lua.checkNumber( stepExpr.eval(lua) ).value();
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27 try {
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28 while( step > 0.0 && v <= limit || step < 0.0 && v >= limit ) {
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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29 lua.stackSet( iVar, new LuaNumber(v) );
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30 block.eval(lua);
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31 v += step;
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32 }
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33 } catch(BreakException e) {
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34 } finally {
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35 lua.stackClear(iVar,iVar+1);
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36 }
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37 }
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39 }