Mercurial Hosting > luan
annotate src/luan/interp/NumericForStmt.java @ 48:64ecb7a3aad7
rename Lua to Luan
git-svn-id: https://luan-java.googlecode.com/svn/trunk@49 21e917c8-12df-6dd8-5cb6-c86387c605b9
author | fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9> |
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date | Fri, 28 Dec 2012 03:29:12 +0000 |
parents | a443637829c1 |
children | 8ede219cd111 |
rev | line source |
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add NumericForStmt
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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2 |
48
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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3 import luan.Luan; |
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4 import luan.LuanException; |
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5 import luan.LuanSource; |
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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6 |
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7 |
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8 final class NumericForStmt extends CodeImpl implements Stmt { |
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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>
parents:
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14 |
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15 NumericForStmt(LuanSource.Element se,int iVar,Expr fromExpr,Expr toExpr,Expr stepExpr,Stmt block) { |
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16 super(se); |
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17 this.iVar = iVar; |
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18 this.fromExpr = fromExpr; |
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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19 this.toExpr = toExpr; |
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20 this.stepExpr = stepExpr; |
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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 lua) throws LuanException { |
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25 double v = lua.checkNumber( se, fromExpr.eval(lua) ).doubleValue(); |
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26 double limit = lua.checkNumber( se, toExpr.eval(lua) ).doubleValue(); |
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27 double step = lua.checkNumber( se, stepExpr.eval(lua) ).doubleValue(); |
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28 try { |
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29 while( step > 0.0 && v <= limit || step < 0.0 && v >= limit ) { |
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30 lua.stackSet( iVar, v ); |
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31 block.eval(lua); |
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32 v += step; |
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33 } |
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34 } catch(BreakException e) { |
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35 } finally { |
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36 lua.stackClear(iVar,iVar+1); |
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37 } |
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38 } |
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39 |
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40 } |