Mercurial Hosting > luan
view core/src/luan/impl/ExpList.java @ 334:25db50d382cb
README.md edited online with Bitbucket
author | Hugo Teixeira <hugo.tech@gmail.com> |
---|---|
date | Wed, 25 Mar 2015 04:28:26 +0000 |
parents | 3dcb0f9bee82 |
children | b48cfa14ba60 |
line wrap: on
line source
package luan.impl; import java.util.List; import java.util.ArrayList; import java.util.Arrays; import luan.LuanException; import luan.LuanSource; import luan.LuanFunction; import luan.Luan; final class ExpList { static final Expressions emptyExpList = new Expressions() { @Override public Object[] eval(LuanStateImpl luan) { return LuanFunction.NOTHING; } @Override public LuanSource.Element se() { return null; } }; static Expr[] toArray(List<Expressions> list) { Expr[] a = new Expr[list.size()]; for( int i=0; i<a.length; i++ ) { Expressions exprs = list.get(i); if( exprs instanceof Expr ) { a[i] = (Expr)exprs; } else { a[i] = new ExpressionsExpr(exprs); } } return a; } static Expressions build(List<Expressions> list) { switch(list.size()) { case 0: return emptyExpList; case 1: return list.get(0); default: if( list.get(list.size()-1) instanceof Expr ) { return new ExprList1( toArray(list) ); } else { Expressions last = list.remove(list.size()-1); return new ExprList2( toArray(list), last ); } } } private static class ExprList1 implements Expressions { private final Expr[] exprs; private ExprList1(Expr[] exprs) { this.exprs = exprs; } @Override public Object eval(LuanStateImpl luan) throws LuanException { Object[] a = new Object[exprs.length]; for( int i=0; i<exprs.length; i++ ) { a[i] = exprs[i].eval(luan); } return a; } @Override public LuanSource.Element se() { return new LuanSource.Element(exprs[0].se().source,exprs[0].se().start,exprs[exprs.length-1].se().end); } } private static class ExprList2 implements Expressions { private final Expr[] exprs; private final Expressions last; private ExprList2(Expr[] exprs,Expressions last) { this.exprs = exprs; this.last = last; } @Override public Object eval(LuanStateImpl luan) throws LuanException { List<Object> list = new ArrayList<Object>(); for( Expr expr : exprs ) { list.add( expr.eval(luan) ); } list.addAll( Arrays.asList(Luan.array( last.eval(luan) )) ); return list.toArray(); } @Override public LuanSource.Element se() { return new LuanSource.Element(exprs[0].se().source,exprs[0].se().start,last.se().end); } } }