Mercurial Hosting > luan
view core/src/luan/impl/ForStmt.java @ 647:8e8c30b72e9b
move methods from LuanState to Luan
author | Franklin Schmidt <fschmidt@gmail.com> |
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date | Tue, 29 Mar 2016 20:39:14 -0600 |
parents | 859c0dedc8b6 |
children |
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package luan.impl; import luan.Luan; import luan.LuanException; import luan.LuanFunction; final class ForStmt extends CodeImpl implements Stmt { private final int iVars; private final int nVars; private final Expr iterExpr; private final Stmt block; ForStmt(int iVars,int nVars,Expr iterExpr,Stmt block) { this.iVars = iVars; this.nVars = nVars; this.iterExpr = iterExpr; this.block = block; } @Override public void eval(LuanStateImpl luan) throws LuanException { Object fnObj = iterExpr.eval(luan); try { LuanFunction iter = Luan.checkFunction(fnObj); while(true) { Object vals = iter.call(luan); if( vals==null ) break; if( vals instanceof Object[] ) { Object[] a = (Object[])vals; if( a.length==0 || a[0]==null ) break; for( int i=0; i<nVars; i++ ) { luan.stackSet( iVars+i, i < a.length ? a[i] : null ); } } else { luan.stackSet( iVars, vals ); for( int i=1; i<nVars; i++ ) { luan.stackSet( iVars+i, null ); } } block.eval(luan); } } catch(BreakException e) { } finally { luan.stackClear(iVars,iVars+nVars); } } }