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view src/luan/interp/NumericForStmt.java @ 49:8ede219cd111
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git-svn-id: https://luan-java.googlecode.com/svn/trunk@50 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 19:35:04 +0000 |
parents | 64ecb7a3aad7 |
children | 6ca02b188dba |
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package luan.interp; import luan.Luan; import luan.LuanException; import luan.LuanSource; final class NumericForStmt extends CodeImpl implements Stmt { private final int iVar; private final Expr fromExpr; private final Expr toExpr; private final Expr stepExpr; private final Stmt block; NumericForStmt(LuanSource.Element se,int iVar,Expr fromExpr,Expr toExpr,Expr stepExpr,Stmt block) { super(se); this.iVar = iVar; this.fromExpr = fromExpr; this.toExpr = toExpr; this.stepExpr = stepExpr; this.block = block; } @Override public void eval(LuanStateImpl luan) throws LuanException { double v = luan.checkNumber( se, fromExpr.eval(luan) ).doubleValue(); double limit = luan.checkNumber( se, toExpr.eval(luan) ).doubleValue(); double step = luan.checkNumber( se, stepExpr.eval(luan) ).doubleValue(); try { while( step > 0.0 && v <= limit || step < 0.0 && v >= limit ) { luan.stackSet( iVar, v ); block.eval(luan); v += step; } } catch(BreakException e) { } finally { luan.stackClear(iVar,iVar+1); } } }