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annotate src/luan/interp/ExpList.java @ 154:c2e5101682ae

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Expr extends Expressions git-svn-id: https://luan-java.googlecode.com/svn/trunk@155 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Tue, 17 Jun 2014 09:55:43 +0000
parents 14281d5bd36f
children
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1 package luan.interp;
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3 import java.util.List;
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4 import java.util.ArrayList;
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5 import java.util.Arrays;
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6 import luan.LuanException;
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7 import luan.LuanSource;
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8 import luan.LuanFunction;
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9 import luan.Luan;
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12 final class ExpList {
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14 static final Expressions emptyExpList = new Expressions() {
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16 @Override public Object[] eval(LuanStateImpl luan) {
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17 return LuanFunction.NOTHING;
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18 }
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20 @Override public LuanSource.Element se() {
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21 return null;
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22 }
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23 };
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25 static Expr[] toArray(List<Expressions> list) {
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26 Expr[] a = new Expr[list.size()];
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27 for( int i=0; i<a.length; i++ ) {
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28 Expressions exprs = list.get(i);
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29 if( exprs instanceof Expr ) {
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30 a[i] = (Expr)exprs;
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31 } else {
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32 a[i] = new ExpressionsExpr(exprs);
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33 }
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34 }
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35 return a;
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36 }
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38 static Expressions build(List<Expressions> list) {
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39 switch(list.size()) {
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40 case 0:
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41 return emptyExpList;
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42 case 1:
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43 return list.get(0);
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44 default:
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45 if( list.get(list.size()-1) instanceof Expr ) {
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46 return new ExprList1( toArray(list) );
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47 } else {
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48 Expressions last = list.remove(list.size()-1);
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49 return new ExprList2( toArray(list), last );
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50 }
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51 }
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52 }
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54 private static class ExprList1 implements Expressions {
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55 private final Expr[] exprs;
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57 private ExprList1(Expr[] exprs) {
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58 this.exprs = exprs;
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59 }
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61 @Override public Object eval(LuanStateImpl luan) throws LuanException {
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62 Object[] a = new Object[exprs.length];
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63 for( int i=0; i<exprs.length; i++ ) {
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64 a[i] = exprs[i].eval(luan);
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65 }
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66 return a;
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67 }
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69 @Override public LuanSource.Element se() {
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70 return new LuanSource.Element(exprs[0].se().source,exprs[0].se().start,exprs[exprs.length-1].se().end);
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71 }
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72 }
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74 private static class ExprList2 implements Expressions {
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75 private final Expr[] exprs;
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76 private final Expressions last;
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78 private ExprList2(Expr[] exprs,Expressions last) {
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79 this.exprs = exprs;
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80 this.last = last;
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81 }
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82
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83 @Override public Object eval(LuanStateImpl luan) throws LuanException {
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84 List<Object> list = new ArrayList<Object>();
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85 for( Expr expr : exprs ) {
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86 list.add( expr.eval(luan) );
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87 }
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88 list.addAll( Arrays.asList(Luan.array( last.eval(luan) )) );
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89 return list.toArray();
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90 }
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92 @Override public LuanSource.Element se() {
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93 return new LuanSource.Element(exprs[0].se().source,exprs[0].se().start,last.se().end);
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94 }
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95 }
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96 }