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annotate src/luan/interp/ExpList.java @ 111:2428ecfed375

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change LuanFunction.call() from returning Object[] to returning Object, to reduce garbage collection git-svn-id: https://luan-java.googlecode.com/svn/trunk@112 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Fri, 23 May 2014 20:40:05 +0000
parents dbf459397217
children 14281d5bd36f
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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 Object obj = expressions.eval(luan);
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43 if( obj instanceof Object[] ) {
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44 for( Object val : (Object[])obj ) {
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45 list.add( val );
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46 }
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47 } else {
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48 list.add(obj);
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49 }
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50 }
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52 public Code code() {
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53 return expressions;
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54 }
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56 }
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58 static class Builder {
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59 private final List<Adder> adders = new ArrayList<Adder>();
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61 void add(Expr expr) {
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62 if( expr==null )
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63 throw new NullPointerException();
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64 adders.add( new ExprAdder(expr) );
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65 }
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67 void add(Expressions expressions) {
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68 adders.add( new ExpressionsAdder(expressions) );
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69 }
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71 void add(Code code) {
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72 if( code instanceof Expr ) {
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73 add((Expr)code);
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74 } else {
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75 add((Expressions)code);
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76 }
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77 }
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78
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79 Expressions build() {
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80 int size = adders.size();
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81 if( size == 0 )
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82 return emptyExpList;
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83 if( size == 1 ) {
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84 Adder adder = adders.get(0);
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85 if( adder instanceof ExpressionsAdder ) {
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86 ExpressionsAdder ea = (ExpressionsAdder)adder;
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87 return ea.expressions;
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88 }
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89 ExprAdder ea = (ExprAdder)adder;
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90 return new SingleExpList(ea.expr);
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91 }
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92 Adder[] a = adders.toArray(new Adder[size]);
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93 for( int i=0; i<size-1; i++ ) {
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94 Adder adder = a[i];
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95 if( adder instanceof ExpressionsAdder ) {
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96 a[i] = new ExprAdder(new ExpressionsExpr(((ExpressionsAdder)adder).expressions));
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97 }
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98 }
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99 return new ExpList(a);
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100 }
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101 }
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102
13
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103 private static final Object[] EMPTY = new Object[0];
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104
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105 static final Expressions emptyExpList = new Expressions() {
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106
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107 @Override public Object[] eval(LuanStateImpl luan) {
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108 return EMPTY;
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109 }
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110
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111 @Override public LuanSource.Element se() {
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112 return null;
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113 }
3
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114 };
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115
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116 static class SingleExpList implements Expressions {
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117 private final Expr expr;
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118
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119 SingleExpList(Expr expr) {
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120 this.expr = expr;
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121 }
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122
111
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123 @Override public Object eval(LuanStateImpl luan) throws LuanException {
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124 return expr.eval(luan);
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125 }
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126
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127 @Override public LuanSource.Element se() {
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128 return expr.se();
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129 }
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130 }
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131
2
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132 private final Adder[] adders;
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133
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134 private ExpList(Adder[] adders) {
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135 this.adders = adders;
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136 }
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137
111
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138 @Override public Object eval(LuanStateImpl luan) throws LuanException {
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139 List<Object> list = new ArrayList<Object>();
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140 for( Adder adder : adders ) {
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141 adder.addTo(luan,list);
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142 }
111
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143 switch( list.size() ) {
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144 case 0:
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145 return EMPTY;
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146 case 1:
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147 return list.get(0);
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148 default:
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149 return list.toArray();
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150 }
2
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151 }
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152
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153 @Override public LuanSource.Element se() {
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154 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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155 }
2
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156 }