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annotate src/luan/interp/ExpList.java @ 107:dbf459397217

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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>
date Mon, 19 May 2014 09:17:57 +0000
parents 754e6030c029
children 2428ecfed375
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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.LuanException;
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7 import luan.LuanSource;
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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(LuanStateImpl luan,List<Object> list) throws LuanException;
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14 public Code code();
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15 }
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17 private static class ExprAdder implements Adder {
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18 private final Expr expr;
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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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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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28 public Code code() {
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29 return expr;
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30 }
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32 }
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34 private static class ExpressionsAdder implements Adder {
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35 private final Expressions expressions;
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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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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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47 public Code code() {
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48 return expressions;
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49 }
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51 }
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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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56 void add(Expr expr) {
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57 if( expr==null )
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58 throw new NullPointerException();
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59 adders.add( new ExprAdder(expr) );
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60 }
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62 void add(Expressions expressions) {
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63 adders.add( new ExpressionsAdder(expressions) );
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64 }
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65
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66 void add(Code code) {
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67 if( code instanceof Expr ) {
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68 add((Expr)code);
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69 } else {
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70 add((Expressions)code);
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71 }
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72 }
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74 Expressions build() {
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75 int size = adders.size();
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76 if( size == 0 )
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77 return emptyExpList;
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78 if( size == 1 ) {
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79 Adder adder = adders.get(0);
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80 if( adder instanceof ExpressionsAdder ) {
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81 ExpressionsAdder ea = (ExpressionsAdder)adder;
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82 return ea.expressions;
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83 }
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84 ExprAdder ea = (ExprAdder)adder;
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85 return new SingleExpList(ea.expr);
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86 }
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87 Adder[] a = adders.toArray(new Adder[size]);
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88 for( int i=0; i<size-1; i++ ) {
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89 Adder adder = a[i];
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90 if( adder instanceof ExpressionsAdder ) {
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91 a[i] = new ExprAdder(new ExpressionsExpr(((ExpressionsAdder)adder).expressions));
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92 }
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93 }
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94 return new ExpList(a);
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95 }
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96 }
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97
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98 private static final Object[] EMPTY = new Object[0];
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99
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100 static final Expressions emptyExpList = new Expressions() {
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101
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102 @Override public Object[] eval(LuanStateImpl luan) {
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103 return EMPTY;
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104 }
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105
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106 @Override public LuanSource.Element se() {
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107 return null;
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108 }
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109 };
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110
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111 static class SingleExpList implements Expressions {
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112 private final Expr expr;
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113
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114 SingleExpList(Expr expr) {
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115 this.expr = expr;
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116 }
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117
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118 @Override public Object[] eval(LuanStateImpl luan) throws LuanException {
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119 return new Object[]{expr.eval(luan)};
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120 }
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121
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122 @Override public LuanSource.Element se() {
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123 return expr.se();
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124 }
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125 }
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126
2
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127 private final Adder[] adders;
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128
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129 private ExpList(Adder[] adders) {
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130 this.adders = adders;
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131 }
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132
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133 @Override public Object[] eval(LuanStateImpl luan) throws LuanException {
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134 List<Object> list = new ArrayList<Object>();
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135 for( Adder adder : adders ) {
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136 adder.addTo(luan,list);
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137 }
13
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138 return list.toArray();
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139 }
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140
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141 @Override public LuanSource.Element se() {
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142 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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143 }
2
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144 }