Mercurial Hosting > luan
view src/luan/interp/ExpList.java @ 107:dbf459397217
change OutputStatement to JspExpressions;
fix multiple results handling;
git-svn-id: https://luan-java.googlecode.com/svn/trunk@108 21e917c8-12df-6dd8-5cb6-c86387c605b9
author | fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9> |
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date | Mon, 19 May 2014 09:17:57 +0000 |
parents | 754e6030c029 |
children | 2428ecfed375 |
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package luan.interp; import java.util.List; import java.util.ArrayList; import java.util.Collections; import luan.LuanException; import luan.LuanSource; final class ExpList implements Expressions { private interface Adder { public void addTo(LuanStateImpl luan,List<Object> list) throws LuanException; public Code code(); } private static class ExprAdder implements Adder { private final Expr expr; ExprAdder(Expr expr) { this.expr = expr; } public void addTo(LuanStateImpl luan,List<Object> list) throws LuanException { list.add( expr.eval(luan) ); } public Code code() { return expr; } } private static class ExpressionsAdder implements Adder { private final Expressions expressions; ExpressionsAdder(Expressions expressions) { this.expressions = expressions; } public void addTo(LuanStateImpl luan,List<Object> list) throws LuanException { for( Object val : expressions.eval(luan) ) { list.add( val ); } } public Code code() { return expressions; } } static class Builder { private final List<Adder> adders = new ArrayList<Adder>(); void add(Expr expr) { if( expr==null ) throw new NullPointerException(); adders.add( new ExprAdder(expr) ); } void add(Expressions expressions) { adders.add( new ExpressionsAdder(expressions) ); } void add(Code code) { if( code instanceof Expr ) { add((Expr)code); } else { add((Expressions)code); } } Expressions build() { int size = adders.size(); if( size == 0 ) return emptyExpList; if( size == 1 ) { Adder adder = adders.get(0); if( adder instanceof ExpressionsAdder ) { ExpressionsAdder ea = (ExpressionsAdder)adder; return ea.expressions; } ExprAdder ea = (ExprAdder)adder; return new SingleExpList(ea.expr); } Adder[] a = adders.toArray(new Adder[size]); for( int i=0; i<size-1; i++ ) { Adder adder = a[i]; if( adder instanceof ExpressionsAdder ) { a[i] = new ExprAdder(new ExpressionsExpr(((ExpressionsAdder)adder).expressions)); } } return new ExpList(a); } } private static final Object[] EMPTY = new Object[0]; static final Expressions emptyExpList = new Expressions() { @Override public Object[] eval(LuanStateImpl luan) { return EMPTY; } @Override public LuanSource.Element se() { return null; } }; static class SingleExpList implements Expressions { private final Expr expr; SingleExpList(Expr expr) { this.expr = expr; } @Override public Object[] eval(LuanStateImpl luan) throws LuanException { return new Object[]{expr.eval(luan)}; } @Override public LuanSource.Element se() { return expr.se(); } } private final Adder[] adders; private ExpList(Adder[] adders) { this.adders = adders; } @Override public Object[] eval(LuanStateImpl luan) throws LuanException { List<Object> list = new ArrayList<Object>(); for( Adder adder : adders ) { adder.addTo(luan,list); } return list.toArray(); } @Override public LuanSource.Element se() { return new LuanSource.Element(adders[0].code().se().source,adders[0].code().se().start,adders[adders.length-1].code().se().end); } }