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annotate src/luan/interp/ExpList.java @ 49:8ede219cd111
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git-svn-id: https://luan-java.googlecode.com/svn/trunk@50 21e917c8-12df-6dd8-5cb6-c86387c605b9
author | fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9> |
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date | Fri, 28 Dec 2012 19:35:04 +0000 |
parents | 64ecb7a3aad7 |
children | 754e6030c029 |
rev | line source |
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1 package luan.interp; |
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2 |
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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.LuanException; |
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7 import luan.LuanSource; |
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8 |
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9 |
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10 final class ExpList implements Expressions { |
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11 |
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12 private interface Adder { |
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13 public void addTo(LuanStateImpl luan,List<Object> list) throws LuanException; |
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14 public Code code(); |
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15 } |
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16 |
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17 private static class ExprAdder implements Adder { |
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18 private final Expr expr; |
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19 |
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20 ExprAdder(Expr expr) { |
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21 this.expr = expr; |
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22 } |
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23 |
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24 public void addTo(LuanStateImpl luan,List<Object> list) throws LuanException { |
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25 list.add( expr.eval(luan) ); |
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26 } |
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27 |
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28 public Code code() { |
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29 return expr; |
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30 } |
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31 |
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32 } |
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33 |
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34 private static class ExpressionsAdder implements Adder { |
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35 private final Expressions expressions; |
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36 |
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37 ExpressionsAdder(Expressions expressions) { |
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38 this.expressions = expressions; |
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39 } |
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40 |
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41 public void addTo(LuanStateImpl luan,List<Object> list) throws LuanException { |
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42 for( Object val : expressions.eval(luan) ) { |
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43 list.add( val ); |
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44 } |
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45 } |
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46 |
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47 public Code code() { |
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48 return expressions; |
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49 } |
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50 |
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51 } |
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52 |
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53 static class Builder { |
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54 private final List<Adder> adders = new ArrayList<Adder>(); |
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55 |
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56 void add(Expr expr) { |
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57 adders.add( new ExprAdder(expr) ); |
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58 } |
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59 |
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60 void add(Expressions expressions) { |
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61 adders.add( new ExpressionsAdder(expressions) ); |
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62 } |
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63 |
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64 Expressions build() { |
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65 if( adders.isEmpty() ) |
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66 return emptyExpList; |
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67 if( adders.size() == 1 ) { |
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68 Adder adder = adders.get(0); |
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69 if( adder instanceof ExpressionsAdder ) { |
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70 ExpressionsAdder ea = (ExpressionsAdder)adder; |
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71 return ea.expressions; |
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72 } |
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73 ExprAdder ea = (ExprAdder)adder; |
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74 return new SingleExpList(ea.expr); |
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75 } |
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76 return new ExpList( adders.toArray(new Adder[0]) ); |
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77 } |
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78 } |
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79 |
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80 private static final Object[] EMPTY = new Object[0]; |
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81 |
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82 static final Expressions emptyExpList = new Expressions() { |
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83 |
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84 @Override public Object[] eval(LuanStateImpl luan) { |
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85 return EMPTY; |
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86 } |
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87 |
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88 @Override public LuanSource.Element se() { |
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89 return null; |
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90 } |
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91 }; |
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92 |
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93 static class SingleExpList implements Expressions { |
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94 private final Expr expr; |
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95 |
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96 SingleExpList(Expr expr) { |
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97 this.expr = expr; |
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98 } |
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99 |
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100 @Override public Object[] eval(LuanStateImpl luan) throws LuanException { |
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101 return new Object[]{expr.eval(luan)}; |
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102 } |
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103 |
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104 @Override public LuanSource.Element se() { |
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105 return expr.se(); |
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106 } |
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107 } |
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108 |
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109 private final Adder[] adders; |
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110 |
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111 private ExpList(Adder[] adders) { |
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112 this.adders = adders; |
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113 } |
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114 |
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115 @Override public Object[] eval(LuanStateImpl luan) throws LuanException { |
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116 List<Object> list = new ArrayList<Object>(); |
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117 for( Adder adder : adders ) { |
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118 adder.addTo(luan,list); |
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119 } |
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120 return list.toArray(); |
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121 } |
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122 |
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123 @Override public LuanSource.Element se() { |
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124 return new LuanSource.Element(adders[0].code().se().source,adders[0].code().se().start,adders[adders.length-1].code().se().end); |
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125 } |
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126 } |