Mercurial Hosting > luan

comparison core/src/luan/impl/ExpList.java @ 171:3dcb0f9bee82

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
add core component git-svn-id: https://luan-java.googlecode.com/svn/trunk@172 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Sun, 22 Jun 2014 05:41:22 +0000
parents src/luan/impl/ExpList.java@4eaee12f6c65
children b48cfa14ba60
comparison
equal deleted inserted replaced
170:7c792a328a83 171:3dcb0f9bee82
1 package luan.impl;
2
3 import java.util.List;
4 import java.util.ArrayList;
5 import java.util.Arrays;
6 import luan.LuanException;
7 import luan.LuanSource;
8 import luan.LuanFunction;
9 import luan.Luan;
10
11
12 final class ExpList {
13
14 static final Expressions emptyExpList = new Expressions() {
15
16 @Override public Object[] eval(LuanStateImpl luan) {
17 return LuanFunction.NOTHING;
18 }
19
20 @Override public LuanSource.Element se() {
21 return null;
22 }
23 };
24
25 static Expr[] toArray(List<Expressions> list) {
26 Expr[] a = new Expr[list.size()];
27 for( int i=0; i<a.length; i++ ) {
28 Expressions exprs = list.get(i);
29 if( exprs instanceof Expr ) {
30 a[i] = (Expr)exprs;
31 } else {
32 a[i] = new ExpressionsExpr(exprs);
33 }
34 }
35 return a;
36 }
37
38 static Expressions build(List<Expressions> list) {
39 switch(list.size()) {
40 case 0:
41 return emptyExpList;
42 case 1:
43 return list.get(0);
44 default:
45 if( list.get(list.size()-1) instanceof Expr ) {
46 return new ExprList1( toArray(list) );
47 } else {
48 Expressions last = list.remove(list.size()-1);
49 return new ExprList2( toArray(list), last );
50 }
51 }
52 }
53
54 private static class ExprList1 implements Expressions {
55 private final Expr[] exprs;
56
57 private ExprList1(Expr[] exprs) {
58 this.exprs = exprs;
59 }
60
61 @Override public Object eval(LuanStateImpl luan) throws LuanException {
62 Object[] a = new Object[exprs.length];
63 for( int i=0; i<exprs.length; i++ ) {
64 a[i] = exprs[i].eval(luan);
65 }
66 return a;
67 }
68
69 @Override public LuanSource.Element se() {
70 return new LuanSource.Element(exprs[0].se().source,exprs[0].se().start,exprs[exprs.length-1].se().end);
71 }
72 }
73
74 private static class ExprList2 implements Expressions {
75 private final Expr[] exprs;
76 private final Expressions last;
77
78 private ExprList2(Expr[] exprs,Expressions last) {
79 this.exprs = exprs;
80 this.last = last;
81 }
82
83 @Override public Object eval(LuanStateImpl luan) throws LuanException {
84 List<Object> list = new ArrayList<Object>();
85 for( Expr expr : exprs ) {
86 list.add( expr.eval(luan) );
87 }
88 list.addAll( Arrays.asList(Luan.array( last.eval(luan) )) );
89 return list.toArray();
90 }
91
92 @Override public LuanSource.Element se() {
93 return new LuanSource.Element(exprs[0].se().source,exprs[0].se().start,last.se().end);
94 }
95 }
96 }