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annotate src/luan/interp/LuaParser.java @ 9:600676034a1a

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add variables and tables git-svn-id: https://luan-java.googlecode.com/svn/trunk@10 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Wed, 21 Nov 2012 09:40:33 +0000
parents 8896068e0a4b
children b7d7069fee58
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1 package luan.interp;
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2
9
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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.Scanner;
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6 import org.parboiled.BaseParser;
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7 import org.parboiled.Parboiled;
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8 import org.parboiled.Rule;
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9 import org.parboiled.parserunners.ReportingParseRunner;
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10 import org.parboiled.support.ParsingResult;
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11 import org.parboiled.errors.ErrorUtils;
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12 import luan.Lua;
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13 import luan.LuaNumber;
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14 import luan.LuaState;
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17 public class LuaParser extends BaseParser<Object> {
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19 Rule Target() {
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20 return Sequence(Spaces(), Expr(), EOI);
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21 }
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23 Rule Expr() {
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24 return OrExpr();
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25 }
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27 Rule OrExpr() {
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28 return Sequence(
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29 AndExpr(),
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30 ZeroOrMore( "or", Spaces(), AndExpr(), push( new OrExpr((Expr)pop(1),(Expr)pop()) ) )
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31 );
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32 }
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33
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34 Rule AndExpr() {
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35 return Sequence(
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36 RelExpr(),
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37 ZeroOrMore( "and", Spaces(), RelExpr(), push( new AndExpr((Expr)pop(1),(Expr)pop()) ) )
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38 );
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39 }
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41 Rule RelExpr() {
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42 return Sequence(
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43 ConcatExpr(),
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44 ZeroOrMore(
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45 FirstOf(
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46 Sequence( "==", Spaces(), ConcatExpr(), push( new EqExpr((Expr)pop(1),(Expr)pop()) ) ),
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47 Sequence( "~=", Spaces(), ConcatExpr(), push( new NotExpr(new EqExpr((Expr)pop(1),(Expr)pop())) ) ),
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48 Sequence( "<=", Spaces(), ConcatExpr(), push( new LeExpr((Expr)pop(1),(Expr)pop()) ) ),
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49 Sequence( ">=", Spaces(), ConcatExpr(), push( new LeExpr((Expr)pop(),(Expr)pop()) ) ),
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50 Sequence( "<", Spaces(), ConcatExpr(), push( new LtExpr((Expr)pop(1),(Expr)pop()) ) ),
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51 Sequence( ">", Spaces(), ConcatExpr(), push( new LtExpr((Expr)pop(),(Expr)pop()) ) )
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52 )
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53 )
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54 );
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55 }
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56
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57 Rule ConcatExpr() {
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58 return Sequence(
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59 SumExpr(),
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60 Optional( "..", Spaces(), ConcatExpr(), push( new ConcatExpr((Expr)pop(1),(Expr)pop()) ) )
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61 );
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62 }
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63
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64 Rule SumExpr() {
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65 return Sequence(
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66 TermExpr(),
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67 ZeroOrMore(
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68 FirstOf(
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69 Sequence( '+', Spaces(), TermExpr(), push( new AddExpr((Expr)pop(1),(Expr)pop()) ) ),
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70 Sequence( '-', Spaces(), TermExpr(), push( new SubExpr((Expr)pop(1),(Expr)pop()) ) )
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71 )
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72 )
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73 );
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74 }
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75
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76 Rule TermExpr() {
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77 return Sequence(
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78 UnaryExpr(),
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79 ZeroOrMore(
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80 FirstOf(
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81 Sequence( '*', Spaces(), UnaryExpr(), push( new MulExpr((Expr)pop(1),(Expr)pop()) ) ),
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82 Sequence( '/', Spaces(), UnaryExpr(), push( new DivExpr((Expr)pop(1),(Expr)pop()) ) ),
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83 Sequence( '%', Spaces(), UnaryExpr(), push( new ModExpr((Expr)pop(1),(Expr)pop()) ) )
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84 )
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85 )
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86 );
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87 }
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88
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89 Rule UnaryExpr() {
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90 return FirstOf(
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91 Sequence( '#', Spaces(), PowExpr(), push( new LenExpr((Expr)pop()) ) ),
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92 Sequence( '-', Spaces(), PowExpr(), push( new UnmExpr((Expr)pop()) ) ),
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93 Sequence( "not", Spaces(), PowExpr(), push( new NotExpr((Expr)pop()) ) ),
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94 PowExpr()
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95 );
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96 }
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97
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98 Rule PowExpr() {
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99 return Sequence(
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100 SingleExpr(),
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101 Optional( '^', Spaces(), PowExpr(), push( new PowExpr((Expr)pop(1),(Expr)pop()) ) )
7
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102 );
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103 }
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104
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105 Rule SingleExpr() {
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106 return FirstOf(
9
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107 TableExpr(),
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108 PrefixExpr(),
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109 LiteralExpr()
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110 );
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111 }
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112
9
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113 Rule TableExpr() {
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114 return Sequence(
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115 '{', Spaces(),
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116 push( new ArrayList<TableExpr.Field>() ),
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117 push( 1.0 ), // counter
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118 Optional(
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119 Field(),
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120 ZeroOrMore(
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121 FieldSep(),
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122 Field()
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123 ),
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124 Optional( FieldSep() )
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125 ),
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126 '}', Spaces(),
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127 push( newTableExpr() )
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128 );
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129 }
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130
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131 TableExpr newTableExpr() {
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132 pop(); // counter
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133 @SuppressWarnings("unchecked")
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134 List<TableExpr.Field> list = (List<TableExpr.Field>)pop();
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135 return new TableExpr(list.toArray(new TableExpr.Field[0]));
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136 }
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137
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138 Rule FieldSep() {
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139 return Sequence( AnyOf(",;"), Spaces() );
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140 }
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141
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142 Rule Field() {
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143 return FirstOf(
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144 Sequence(
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145 FirstOf( SubExpr(), Name() ),
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146 '=', Spaces(), Expr(),
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147 addField()
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148 ),
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149 Sequence(
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150 Expr(),
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151 addIndexedField()
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152 )
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153 );
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154 }
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155
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156 boolean addField() {
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157 TableExpr.Field field = new TableExpr.Field( (Expr)pop(1), (Expr)pop() );
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158 @SuppressWarnings("unchecked")
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159 List<TableExpr.Field> list = (List<TableExpr.Field>)peek(1);
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160 list.add(field);
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161 return true;
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162 }
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163
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164 boolean addIndexedField() {
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165 Expr val = (Expr)pop();
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166 double i = (Double)pop();
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167 TableExpr.Field field = new TableExpr.Field( new ConstExpr(new LuaNumber(i)), val );
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168 push( i + 1 );
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169 @SuppressWarnings("unchecked")
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170 List<TableExpr.Field> list = (List<TableExpr.Field>)peek(1);
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171 list.add(field);
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172 return true;
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173 }
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174
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175 Rule PrefixExpr() {
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176 return Sequence(
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177 FirstOf(
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178 Sequence( '(', Spaces(), Expr(), ')', Spaces() ),
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179 Var()
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180 ),
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181 ZeroOrMore(
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182 FirstOf(
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183 SubExpr(),
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184 Sequence( '.', Spaces(), Name() )
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185 ),
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186 push( new GetExpr( (Expr)pop(1), (Expr)pop() ) )
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187 )
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188 );
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189 }
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190
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191 Rule SubExpr() {
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192 return Sequence( '[', Spaces(), Expr(), ']', Spaces() );
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193 }
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194
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195 Rule Var() {
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196 return Sequence(
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197 Name(),
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198 push( new GetExpr( EnvExpr.INSTANCE, (Expr)pop() ) )
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199 );
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200 }
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201
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202 Rule Name() {
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203 return Sequence(
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204 Sequence(
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205 NameStart(),
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206 ZeroOrMore(
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207 FirstOf( NameStart(), Digit() )
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208 )
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209 ),
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210 push( new ConstExpr(match()) ),
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211 Spaces()
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212 );
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213 }
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214
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215 Rule NameStart() {
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216 return FirstOf(
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217 CharRange('a', 'z'),
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218 CharRange('A', 'Z'),
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219 '_'
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220 );
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221 }
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222
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223 Rule LiteralExpr() {
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224 return Sequence(
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225 Literal(), Spaces(),
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226 push(new ConstExpr(pop()))
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227 );
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228 }
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229
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230 Rule Literal() {
5
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231 return FirstOf(
7
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232 NilLiteral(),
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233 BooleanLiteral(),
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234 NumberLiteral(),
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235 StringLiteral()
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236 );
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237 }
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238
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239 Rule NilLiteral() {
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240 return Sequence( "nil", push(null) );
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241 }
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242
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diff changeset
243 Rule BooleanLiteral() {
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244 return FirstOf(
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245 Sequence( "true", push(true) ),
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246 Sequence( "false", push(false) )
5
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247 );
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248 }
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249
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250 Rule NumberLiteral() {
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251 return Sequence(
6
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252 Number(),
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253 push(new LuaNumber((Double)pop()))
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254 );
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255 }
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256
6
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257 Rule Number() {
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258 return FirstOf(
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259 Sequence(
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260 IgnoreCase("0x"),
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261 OneOrMore(HexDigit()),
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262 push((double)Long.parseLong(match(),16))
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263 ),
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264 Sequence(
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265 DecNumber(),
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266 push(Double.parseDouble(match()))
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267 )
5
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268 );
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269 }
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270
6
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271 Rule DecNumber() {
5
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272 return FirstOf(
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273 Sequence(
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274 Int(),
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275 Optional( '.', Optional(Int()) ),
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276 NumberExp()
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277 ),
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278 Sequence( '.', Int(), NumberExp() )
5
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279 );
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280 }
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281
6
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282 Rule NumberExp() {
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283 return Optional(
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284 IgnoreCase('e'),
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285 Optional(AnyOf("+-")),
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286 Int()
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287 );
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288 }
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289
6
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290 Rule Int() {
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291 return OneOrMore(Digit());
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292 }
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293
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294 Rule HexDigit() {
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295 return FirstOf(
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296 Digit(),
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297 AnyOf("abcdefABCDEF")
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298 );
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299 }
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300
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301 Rule Digit() {
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302 return CharRange('0', '9');
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303 }
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304
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305 Rule StringLiteral() {
6
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306 return FirstOf(
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307 QuotedString('"'),
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308 QuotedString('\'')
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309 );
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310 }
5
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311
6
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312 Rule QuotedString(char quote) {
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313 return Sequence(
7
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diff changeset
314 quote,
6
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diff changeset
315 push(new StringBuffer()),
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316 ZeroOrMore(
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317 FirstOf(
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318 Sequence(
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diff changeset
319 NoneOf("\\\n"+quote),
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diff changeset
320 append(matchedChar())
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diff changeset
321 ),
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diff changeset
322 EscSeq()
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323 )
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324 ),
7
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325 quote,
6
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326 push(((StringBuffer)pop()).toString())
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327 );
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328 }
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329
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330 Rule EscSeq() {
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331 return Sequence(
7
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332 '\\',
6
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333 FirstOf(
7
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334 Sequence( 'a', append('\u0007') ),
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335 Sequence( 'b', append('\b') ),
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336 Sequence( 'f', append('\f') ),
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337 Sequence( 'n', append('\n') ),
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338 Sequence( 'r', append('\r') ),
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339 Sequence( 't', append('\t') ),
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340 Sequence( 'v', append('\u000b') ),
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341 Sequence( '\\', append('\\') ),
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342 Sequence( '"', append('"') ),
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343 Sequence( '\'', append('\'') ),
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344 Sequence(
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345 'x',
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346 Sequence( HexDigit(), HexDigit() ),
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347 append( (char)Integer.parseInt(match(),16) )
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348 ),
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349 Sequence(
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350 Sequence(
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351 Digit(),
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352 Optional(
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353 Digit(),
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354 Optional(
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355 Digit()
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356 )
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357 )
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358 ),
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359 append( (char)Integer.parseInt(match()) )
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360 )
6
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361 )
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362 );
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363 }
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364
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365 boolean append(char ch) {
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366 StringBuffer sb = (StringBuffer)peek();
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367 sb.append(ch);
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368 return true;
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369 }
5
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370
7
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371 public Rule Spaces() {
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372 return ZeroOrMore(AnyOf(" \t"));
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373 }
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374
5
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375 // for testing
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376 public static void main(String[] args) throws Exception {
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377 LuaParser parser = Parboiled.createParser(LuaParser.class);
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378 while( true ) {
6
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379 String input = new Scanner(System.in).nextLine();
5
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380 ParsingResult<?> result = new ReportingParseRunner(parser.Target()).run(input);
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381 if( result.hasErrors() ) {
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382 System.out.println("Parse Errors:\n" + ErrorUtils.printParseErrors(result));
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383 } else {
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384 Expr expr = (Expr)result.resultValue;
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385 LuaState lua = new LuaState();
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386 Object val = expr.eval(lua);
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387 System.out.println("Result: "+Lua.toString(val));
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388 }
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389 }
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390 }
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391 }