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annotate src/luan/interp/ExpList.java @ 13:3b22ffbdb83a

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minor git-svn-id: https://luan-java.googlecode.com/svn/trunk@14 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Fri, 23 Nov 2012 13:04:03 +0000
parents b7d7069fee58
children 5cf15507d77e
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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.Collections;
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6 import luan.LuaException;
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7 import luan.LuaState;
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10 final class ExpList implements Expressions {
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12 private interface Adder {
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13 public void addTo(LuaState lua,List<Object> list) throws LuaException;
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14 }
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16 private static class ExprAdder implements Adder {
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17 private final Expr expr;
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19 ExprAdder(Expr expr) {
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20 this.expr = expr;
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21 }
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23 public void addTo(LuaState lua,List<Object> list) throws LuaException {
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24 list.add( expr.eval(lua) );
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25 }
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27 }
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29 private static class ExpressionsAdder implements Adder {
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30 private final Expressions expressions;
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32 ExpressionsAdder(Expressions expressions) {
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33 this.expressions = expressions;
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34 }
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36 public void addTo(LuaState lua,List<Object> list) throws LuaException {
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37 for( Object val : expressions.eval(lua) ) {
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38 list.add( val );
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39 }
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40 }
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42 }
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44 static class Builder {
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45 private final List<Adder> adders = new ArrayList<Adder>();
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47 void add(Expr expr) {
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48 adders.add( new ExprAdder(expr) );
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49 }
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51 void add(Expressions expressions) {
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52 adders.add( new ExpressionsAdder(expressions) );
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53 }
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55 Expressions build() {
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56 if( adders.isEmpty() )
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57 return emptyExpList;
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58 if( adders.size() == 1 ) {
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59 Adder adder = adders.get(0);
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60 if( adder instanceof ExpressionsAdder ) {
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61 ExpressionsAdder ea = (ExpressionsAdder)adder;
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62 return ea.expressions;
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63 }
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64 ExprAdder ea = (ExprAdder)adder;
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65 return new SingleExpList(ea.expr);
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66 }
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67 return new ExpList( adders.toArray(new Adder[0]) );
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68 }
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69 }
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71 private static final Object[] EMPTY = new Object[0];
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73 static final Expressions emptyExpList = new Expressions() {
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74 @Override public Object[] eval(LuaState lua) {
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75 return EMPTY;
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76 }
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77 };
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79 static class SingleExpList implements Expressions {
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80 private final Expr expr;
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82 SingleExpList(Expr expr) {
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83 this.expr = expr;
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84 }
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86 @Override public Object[] eval(LuaState lua) throws LuaException {
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87 return new Object[]{expr.eval(lua)};
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88 }
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89 }
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91 private final Adder[] adders;
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93 private ExpList(Adder[] adders) {
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94 this.adders = adders;
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95 }
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97 @Override public Object[] eval(LuaState lua) throws LuaException {
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98 List<Object> list = new ArrayList<Object>();
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99 for( Adder adder : adders ) {
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100 adder.addTo(lua,list);
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101 }
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102 return list.toArray();
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103 }
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104 }